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f34652de0b
Currently, every internal_error call must be passed __FILE__/__LINE__
explicitly, like:
internal_error (__FILE__, __LINE__, "foo %d", var);
The need to pass in explicit __FILE__/__LINE__ is there probably
because the function predates widespread and portable variadic macros
availability. We can use variadic macros nowadays, and in fact, we
already use them in several places, including the related
gdb_assert_not_reached.
So this patch renames the internal_error function to something else,
and then reimplements internal_error as a variadic macro that expands
__FILE__/__LINE__ itself.
The result is that we now should call internal_error like so:
internal_error ("foo %d", var);
Likewise for internal_warning.
The patch adjusts all calls sites. 99% of the adjustments were done
with a perl/sed script.
The non-mechanical changes are in gdbsupport/errors.h,
gdbsupport/gdb_assert.h, and gdb/gdbarch.py.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: Ia6f372c11550ca876829e8fd85048f4502bdcf06
4063 lines
112 KiB
C
4063 lines
112 KiB
C
/* Target dependent code for CRIS, for GDB, the GNU debugger.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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Contributed by Axis Communications AB.
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Written by Hendrik Ruijter, Stefan Andersson, and Orjan Friberg.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "frame-unwind.h"
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#include "frame-base.h"
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#include "trad-frame.h"
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#include "dwarf2/frame.h"
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#include "symtab.h"
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#include "inferior.h"
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#include "gdbtypes.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "value.h"
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#include "opcode/cris.h"
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#include "osabi.h"
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#include "arch-utils.h"
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#include "regcache.h"
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#include "regset.h"
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#include "objfiles.h"
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#include "solib.h" /* Support for shared libraries. */
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#include "solib-svr4.h"
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#include "dis-asm.h"
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#include "cris-tdep.h"
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enum cris_num_regs
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{
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/* There are no floating point registers. Used in gdbserver low-linux.c. */
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NUM_FREGS = 0,
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/* There are 16 general registers. */
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NUM_GENREGS = 16,
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/* There are 16 special registers. */
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NUM_SPECREGS = 16,
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/* CRISv32 has a pseudo PC register, not noted here. */
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/* CRISv32 has 16 support registers. */
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NUM_SUPPREGS = 16
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};
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/* Register numbers of various important registers.
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CRIS_FP_REGNUM Contains address of executing stack frame.
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STR_REGNUM Contains the address of structure return values.
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RET_REGNUM Contains the return value when shorter than or equal to 32 bits
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ARG1_REGNUM Contains the first parameter to a function.
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ARG2_REGNUM Contains the second parameter to a function.
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ARG3_REGNUM Contains the third parameter to a function.
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ARG4_REGNUM Contains the fourth parameter to a function. Rest on stack.
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gdbarch_sp_regnum Contains address of top of stack.
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gdbarch_pc_regnum Contains address of next instruction.
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SRP_REGNUM Subroutine return pointer register.
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BRP_REGNUM Breakpoint return pointer register. */
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enum cris_regnums
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{
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/* Enums with respect to the general registers, valid for all
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CRIS versions. The frame pointer is always in R8. */
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CRIS_FP_REGNUM = 8,
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/* ABI related registers. */
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STR_REGNUM = 9,
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RET_REGNUM = 10,
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ARG1_REGNUM = 10,
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ARG2_REGNUM = 11,
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ARG3_REGNUM = 12,
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ARG4_REGNUM = 13,
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/* Registers which happen to be common. */
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VR_REGNUM = 17,
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MOF_REGNUM = 23,
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SRP_REGNUM = 27,
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/* CRISv10 et al. specific registers. */
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P0_REGNUM = 16,
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P4_REGNUM = 20,
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CCR_REGNUM = 21,
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P8_REGNUM = 24,
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IBR_REGNUM = 25,
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IRP_REGNUM = 26,
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BAR_REGNUM = 28,
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DCCR_REGNUM = 29,
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BRP_REGNUM = 30,
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USP_REGNUM = 31,
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/* CRISv32 specific registers. */
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ACR_REGNUM = 15,
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BZ_REGNUM = 16,
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PID_REGNUM = 18,
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SRS_REGNUM = 19,
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WZ_REGNUM = 20,
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EXS_REGNUM = 21,
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EDA_REGNUM = 22,
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DZ_REGNUM = 24,
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EBP_REGNUM = 25,
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ERP_REGNUM = 26,
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NRP_REGNUM = 28,
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CCS_REGNUM = 29,
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CRISV32USP_REGNUM = 30, /* Shares name but not number with CRISv10. */
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SPC_REGNUM = 31,
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CRISV32PC_REGNUM = 32, /* Shares name but not number with CRISv10. */
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S0_REGNUM = 33,
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S1_REGNUM = 34,
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S2_REGNUM = 35,
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S3_REGNUM = 36,
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S4_REGNUM = 37,
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S5_REGNUM = 38,
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S6_REGNUM = 39,
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S7_REGNUM = 40,
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S8_REGNUM = 41,
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S9_REGNUM = 42,
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S10_REGNUM = 43,
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S11_REGNUM = 44,
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S12_REGNUM = 45,
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S13_REGNUM = 46,
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S14_REGNUM = 47,
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S15_REGNUM = 48,
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};
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extern const struct cris_spec_reg cris_spec_regs[];
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/* CRIS version, set via the user command 'set cris-version'. Affects
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register names and sizes. */
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static unsigned int usr_cmd_cris_version;
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/* Indicates whether to trust the above variable. */
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static bool usr_cmd_cris_version_valid = false;
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static const char cris_mode_normal[] = "normal";
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static const char cris_mode_guru[] = "guru";
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static const char *const cris_modes[] = {
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cris_mode_normal,
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cris_mode_guru,
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0
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};
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/* CRIS mode, set via the user command 'set cris-mode'. Affects
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type of break instruction among other things. */
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static const char *usr_cmd_cris_mode = cris_mode_normal;
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/* Whether to make use of Dwarf-2 CFI (default on). */
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static bool usr_cmd_cris_dwarf2_cfi = true;
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/* Sigtramp identification code copied from i386-linux-tdep.c. */
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#define SIGTRAMP_INSN0 0x9c5f /* movu.w 0xXX, $r9 */
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#define SIGTRAMP_OFFSET0 0
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#define SIGTRAMP_INSN1 0xe93d /* break 13 */
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#define SIGTRAMP_OFFSET1 4
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static const unsigned short sigtramp_code[] =
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{
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SIGTRAMP_INSN0, 0x0077, /* movu.w $0x77, $r9 */
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SIGTRAMP_INSN1 /* break 13 */
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};
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#define SIGTRAMP_LEN (sizeof sigtramp_code)
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/* Note: same length as normal sigtramp code. */
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static const unsigned short rt_sigtramp_code[] =
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{
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SIGTRAMP_INSN0, 0x00ad, /* movu.w $0xad, $r9 */
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SIGTRAMP_INSN1 /* break 13 */
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};
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/* If PC is in a sigtramp routine, return the address of the start of
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the routine. Otherwise, return 0. */
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static CORE_ADDR
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cris_sigtramp_start (frame_info_ptr this_frame)
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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gdb_byte buf[SIGTRAMP_LEN];
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if (!safe_frame_unwind_memory (this_frame, pc, buf))
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return 0;
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if (((buf[1] << 8) + buf[0]) != SIGTRAMP_INSN0)
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{
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if (((buf[1] << 8) + buf[0]) != SIGTRAMP_INSN1)
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return 0;
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pc -= SIGTRAMP_OFFSET1;
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if (!safe_frame_unwind_memory (this_frame, pc, buf))
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return 0;
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}
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if (memcmp (buf, sigtramp_code, SIGTRAMP_LEN) != 0)
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return 0;
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return pc;
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}
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/* If PC is in a RT sigtramp routine, return the address of the start of
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the routine. Otherwise, return 0. */
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static CORE_ADDR
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cris_rt_sigtramp_start (frame_info_ptr this_frame)
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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gdb_byte buf[SIGTRAMP_LEN];
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if (!safe_frame_unwind_memory (this_frame, pc, buf))
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return 0;
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if (((buf[1] << 8) + buf[0]) != SIGTRAMP_INSN0)
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{
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if (((buf[1] << 8) + buf[0]) != SIGTRAMP_INSN1)
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return 0;
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pc -= SIGTRAMP_OFFSET1;
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if (!safe_frame_unwind_memory (this_frame, pc, buf))
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return 0;
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}
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if (memcmp (buf, rt_sigtramp_code, SIGTRAMP_LEN) != 0)
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return 0;
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return pc;
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}
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/* Assuming THIS_FRAME is a frame for a GNU/Linux sigtramp routine,
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return the address of the associated sigcontext structure. */
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static CORE_ADDR
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cris_sigcontext_addr (frame_info_ptr this_frame)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR pc;
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CORE_ADDR sp;
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gdb_byte buf[4];
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get_frame_register (this_frame, gdbarch_sp_regnum (gdbarch), buf);
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sp = extract_unsigned_integer (buf, 4, byte_order);
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/* Look for normal sigtramp frame first. */
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pc = cris_sigtramp_start (this_frame);
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if (pc)
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{
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/* struct signal_frame (arch/cris/kernel/signal.c) contains
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struct sigcontext as its first member, meaning the SP points to
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it already. */
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return sp;
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}
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pc = cris_rt_sigtramp_start (this_frame);
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if (pc)
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{
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/* struct rt_signal_frame (arch/cris/kernel/signal.c) contains
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a struct ucontext, which in turn contains a struct sigcontext.
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Magic digging:
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4 + 4 + 128 to struct ucontext, then
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4 + 4 + 12 to struct sigcontext. */
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return (sp + 156);
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}
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error (_("Couldn't recognize signal trampoline."));
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return 0;
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}
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struct cris_unwind_cache
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{
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/* The previous frame's inner most stack address. Used as this
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frame ID's stack_addr. */
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CORE_ADDR prev_sp;
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/* The frame's base, optionally used by the high-level debug info. */
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CORE_ADDR base;
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int size;
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/* How far the SP and r8 (FP) have been offset from the start of
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the stack frame (as defined by the previous frame's stack
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pointer). */
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LONGEST sp_offset;
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LONGEST r8_offset;
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int uses_frame;
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/* From old frame_extra_info struct. */
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CORE_ADDR return_pc;
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int leaf_function;
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/* Table indicating the location of each and every register. */
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trad_frame_saved_reg *saved_regs;
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};
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static struct cris_unwind_cache *
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cris_sigtramp_frame_unwind_cache (frame_info_ptr this_frame,
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void **this_cache)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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struct cris_unwind_cache *info;
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CORE_ADDR addr;
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gdb_byte buf[4];
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int i;
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if ((*this_cache))
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return (struct cris_unwind_cache *) (*this_cache);
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info = FRAME_OBSTACK_ZALLOC (struct cris_unwind_cache);
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(*this_cache) = info;
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info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
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/* Zero all fields. */
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info->prev_sp = 0;
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info->base = 0;
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info->size = 0;
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info->sp_offset = 0;
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info->r8_offset = 0;
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info->uses_frame = 0;
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info->return_pc = 0;
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info->leaf_function = 0;
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get_frame_register (this_frame, gdbarch_sp_regnum (gdbarch), buf);
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info->base = extract_unsigned_integer (buf, 4, byte_order);
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addr = cris_sigcontext_addr (this_frame);
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/* Layout of the sigcontext struct:
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struct sigcontext {
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struct pt_regs regs;
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unsigned long oldmask;
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unsigned long usp;
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}; */
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if (tdep->cris_version == 10)
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{
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/* R0 to R13 are stored in reverse order at offset (2 * 4) in
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struct pt_regs. */
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for (i = 0; i <= 13; i++)
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info->saved_regs[i].set_addr (addr + ((15 - i) * 4));
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info->saved_regs[MOF_REGNUM].set_addr (addr + (16 * 4));
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info->saved_regs[DCCR_REGNUM].set_addr (addr + (17 * 4));
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info->saved_regs[SRP_REGNUM].set_addr (addr + (18 * 4));
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/* Note: IRP is off by 2 at this point. There's no point in correcting
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it though since that will mean that the backtrace will show a PC
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different from what is shown when stopped. */
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info->saved_regs[IRP_REGNUM].set_addr (addr + (19 * 4));
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info->saved_regs[gdbarch_pc_regnum (gdbarch)]
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= info->saved_regs[IRP_REGNUM];
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info->saved_regs[gdbarch_sp_regnum (gdbarch)].set_addr (addr + (24 * 4));
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}
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else
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{
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/* CRISv32. */
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/* R0 to R13 are stored in order at offset (1 * 4) in
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struct pt_regs. */
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for (i = 0; i <= 13; i++)
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info->saved_regs[i].set_addr (addr + ((i + 1) * 4));
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info->saved_regs[ACR_REGNUM].set_addr (addr + (15 * 4));
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info->saved_regs[SRS_REGNUM].set_addr (addr + (16 * 4));
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info->saved_regs[MOF_REGNUM].set_addr (addr + (17 * 4));
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info->saved_regs[SPC_REGNUM].set_addr (addr + (18 * 4));
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info->saved_regs[CCS_REGNUM].set_addr (addr + (19 * 4));
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info->saved_regs[SRP_REGNUM].set_addr (addr + (20 * 4));
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info->saved_regs[ERP_REGNUM].set_addr (addr + (21 * 4));
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info->saved_regs[EXS_REGNUM].set_addr (addr + (22 * 4));
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info->saved_regs[EDA_REGNUM].set_addr (addr + (23 * 4));
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/* FIXME: If ERP is in a delay slot at this point then the PC will
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be wrong at this point. This problem manifests itself in the
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sigaltstack.exp test case, which occasionally generates FAILs when
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the signal is received while in a delay slot.
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This could be solved by a couple of read_memory_unsigned_integer and a
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trad_frame_set_value. */
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info->saved_regs[gdbarch_pc_regnum (gdbarch)]
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= info->saved_regs[ERP_REGNUM];
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info->saved_regs[gdbarch_sp_regnum (gdbarch)].set_addr (addr + (25 * 4));
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}
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return info;
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}
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static void
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cris_sigtramp_frame_this_id (frame_info_ptr this_frame, void **this_cache,
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struct frame_id *this_id)
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{
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struct cris_unwind_cache *cache =
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cris_sigtramp_frame_unwind_cache (this_frame, this_cache);
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(*this_id) = frame_id_build (cache->base, get_frame_pc (this_frame));
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}
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/* Forward declaration. */
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static struct value *cris_frame_prev_register (frame_info_ptr this_frame,
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void **this_cache, int regnum);
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static struct value *
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cris_sigtramp_frame_prev_register (frame_info_ptr this_frame,
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void **this_cache, int regnum)
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{
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/* Make sure we've initialized the cache. */
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cris_sigtramp_frame_unwind_cache (this_frame, this_cache);
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return cris_frame_prev_register (this_frame, this_cache, regnum);
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}
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static int
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cris_sigtramp_frame_sniffer (const struct frame_unwind *self,
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frame_info_ptr this_frame,
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void **this_cache)
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{
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if (cris_sigtramp_start (this_frame)
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|| cris_rt_sigtramp_start (this_frame))
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return 1;
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return 0;
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}
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static const struct frame_unwind cris_sigtramp_frame_unwind =
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{
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"cris sigtramp",
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SIGTRAMP_FRAME,
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default_frame_unwind_stop_reason,
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cris_sigtramp_frame_this_id,
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cris_sigtramp_frame_prev_register,
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NULL,
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cris_sigtramp_frame_sniffer
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};
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static int
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crisv32_single_step_through_delay (struct gdbarch *gdbarch,
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frame_info_ptr this_frame)
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{
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cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
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ULONGEST erp;
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int ret = 0;
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if (tdep->cris_mode == cris_mode_guru)
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erp = get_frame_register_unsigned (this_frame, NRP_REGNUM);
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else
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erp = get_frame_register_unsigned (this_frame, ERP_REGNUM);
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if (erp & 0x1)
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{
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/* In delay slot - check if there's a breakpoint at the preceding
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instruction. */
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if (breakpoint_here_p (get_frame_address_space (this_frame), erp & ~0x1))
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ret = 1;
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}
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return ret;
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}
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|
|
/* The instruction environment needed to find single-step breakpoints. */
|
|
|
|
typedef
|
|
struct instruction_environment
|
|
{
|
|
unsigned long reg[NUM_GENREGS];
|
|
unsigned long preg[NUM_SPECREGS];
|
|
unsigned long branch_break_address;
|
|
unsigned long delay_slot_pc;
|
|
unsigned long prefix_value;
|
|
int branch_found;
|
|
int prefix_found;
|
|
int invalid;
|
|
int slot_needed;
|
|
int delay_slot_pc_active;
|
|
int xflag_found;
|
|
int disable_interrupt;
|
|
enum bfd_endian byte_order;
|
|
} inst_env_type;
|
|
|
|
/* Machine-dependencies in CRIS for opcodes. */
|
|
|
|
/* Instruction sizes. */
|
|
enum cris_instruction_sizes
|
|
{
|
|
INST_BYTE_SIZE = 0,
|
|
INST_WORD_SIZE = 1,
|
|
INST_DWORD_SIZE = 2
|
|
};
|
|
|
|
/* Addressing modes. */
|
|
enum cris_addressing_modes
|
|
{
|
|
REGISTER_MODE = 1,
|
|
INDIRECT_MODE = 2,
|
|
AUTOINC_MODE = 3
|
|
};
|
|
|
|
/* Prefix addressing modes. */
|
|
enum cris_prefix_addressing_modes
|
|
{
|
|
PREFIX_INDEX_MODE = 2,
|
|
PREFIX_ASSIGN_MODE = 3,
|
|
|
|
/* Handle immediate byte offset addressing mode prefix format. */
|
|
PREFIX_OFFSET_MODE = 2
|
|
};
|
|
|
|
/* Masks for opcodes. */
|
|
enum cris_opcode_masks
|
|
{
|
|
BRANCH_SIGNED_SHORT_OFFSET_MASK = 0x1,
|
|
SIGNED_EXTEND_BIT_MASK = 0x2,
|
|
SIGNED_BYTE_MASK = 0x80,
|
|
SIGNED_BYTE_EXTEND_MASK = 0xFFFFFF00,
|
|
SIGNED_WORD_MASK = 0x8000,
|
|
SIGNED_WORD_EXTEND_MASK = 0xFFFF0000,
|
|
SIGNED_DWORD_MASK = 0x80000000,
|
|
SIGNED_QUICK_VALUE_MASK = 0x20,
|
|
SIGNED_QUICK_VALUE_EXTEND_MASK = 0xFFFFFFC0
|
|
};
|
|
|
|
/* Functions for opcodes. The general form of the ETRAX 16-bit instruction:
|
|
Bit 15 - 12 Operand2
|
|
11 - 10 Mode
|
|
9 - 6 Opcode
|
|
5 - 4 Size
|
|
3 - 0 Operand1 */
|
|
|
|
static int
|
|
cris_get_operand2 (unsigned short insn)
|
|
{
|
|
return ((insn & 0xF000) >> 12);
|
|
}
|
|
|
|
static int
|
|
cris_get_mode (unsigned short insn)
|
|
{
|
|
return ((insn & 0x0C00) >> 10);
|
|
}
|
|
|
|
static int
|
|
cris_get_opcode (unsigned short insn)
|
|
{
|
|
return ((insn & 0x03C0) >> 6);
|
|
}
|
|
|
|
static int
|
|
cris_get_size (unsigned short insn)
|
|
{
|
|
return ((insn & 0x0030) >> 4);
|
|
}
|
|
|
|
static int
|
|
cris_get_operand1 (unsigned short insn)
|
|
{
|
|
return (insn & 0x000F);
|
|
}
|
|
|
|
/* Additional functions in order to handle opcodes. */
|
|
|
|
static int
|
|
cris_get_quick_value (unsigned short insn)
|
|
{
|
|
return (insn & 0x003F);
|
|
}
|
|
|
|
static int
|
|
cris_get_bdap_quick_offset (unsigned short insn)
|
|
{
|
|
return (insn & 0x00FF);
|
|
}
|
|
|
|
static int
|
|
cris_get_branch_short_offset (unsigned short insn)
|
|
{
|
|
return (insn & 0x00FF);
|
|
}
|
|
|
|
static int
|
|
cris_get_asr_shift_steps (unsigned long value)
|
|
{
|
|
return (value & 0x3F);
|
|
}
|
|
|
|
static int
|
|
cris_get_clear_size (unsigned short insn)
|
|
{
|
|
return ((insn) & 0xC000);
|
|
}
|
|
|
|
static int
|
|
cris_is_signed_extend_bit_on (unsigned short insn)
|
|
{
|
|
return (((insn) & 0x20) == 0x20);
|
|
}
|
|
|
|
static int
|
|
cris_is_xflag_bit_on (unsigned short insn)
|
|
{
|
|
return (((insn) & 0x1000) == 0x1000);
|
|
}
|
|
|
|
static void
|
|
cris_set_size_to_dword (unsigned short *insn)
|
|
{
|
|
*insn &= 0xFFCF;
|
|
*insn |= 0x20;
|
|
}
|
|
|
|
static signed char
|
|
cris_get_signed_offset (unsigned short insn)
|
|
{
|
|
return ((signed char) (insn & 0x00FF));
|
|
}
|
|
|
|
/* Calls an op function given the op-type, working on the insn and the
|
|
inst_env. */
|
|
static void cris_gdb_func (struct gdbarch *, enum cris_op_type, unsigned short,
|
|
inst_env_type *);
|
|
|
|
static struct gdbarch *cris_gdbarch_init (struct gdbarch_info,
|
|
struct gdbarch_list *);
|
|
|
|
static void cris_dump_tdep (struct gdbarch *, struct ui_file *);
|
|
|
|
static void set_cris_version (const char *ignore_args, int from_tty,
|
|
struct cmd_list_element *c);
|
|
|
|
static void set_cris_mode (const char *ignore_args, int from_tty,
|
|
struct cmd_list_element *c);
|
|
|
|
static void set_cris_dwarf2_cfi (const char *ignore_args, int from_tty,
|
|
struct cmd_list_element *c);
|
|
|
|
static CORE_ADDR cris_scan_prologue (CORE_ADDR pc,
|
|
frame_info_ptr this_frame,
|
|
struct cris_unwind_cache *info);
|
|
|
|
static CORE_ADDR crisv32_scan_prologue (CORE_ADDR pc,
|
|
frame_info_ptr this_frame,
|
|
struct cris_unwind_cache *info);
|
|
|
|
/* When arguments must be pushed onto the stack, they go on in reverse
|
|
order. The below implements a FILO (stack) to do this.
|
|
Copied from d10v-tdep.c. */
|
|
|
|
struct cris_stack_item
|
|
{
|
|
int len;
|
|
struct cris_stack_item *prev;
|
|
gdb_byte *data;
|
|
};
|
|
|
|
static struct cris_stack_item *
|
|
push_stack_item (struct cris_stack_item *prev, const gdb_byte *contents,
|
|
int len)
|
|
{
|
|
struct cris_stack_item *si = XNEW (struct cris_stack_item);
|
|
si->data = (gdb_byte *) xmalloc (len);
|
|
si->len = len;
|
|
si->prev = prev;
|
|
memcpy (si->data, contents, len);
|
|
return si;
|
|
}
|
|
|
|
static struct cris_stack_item *
|
|
pop_stack_item (struct cris_stack_item *si)
|
|
{
|
|
struct cris_stack_item *dead = si;
|
|
si = si->prev;
|
|
xfree (dead->data);
|
|
xfree (dead);
|
|
return si;
|
|
}
|
|
|
|
/* Put here the code to store, into fi->saved_regs, the addresses of
|
|
the saved registers of frame described by FRAME_INFO. This
|
|
includes special registers such as pc and fp saved in special ways
|
|
in the stack frame. sp is even more special: the address we return
|
|
for it IS the sp for the next frame. */
|
|
|
|
static struct cris_unwind_cache *
|
|
cris_frame_unwind_cache (frame_info_ptr this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
|
|
struct cris_unwind_cache *info;
|
|
|
|
if ((*this_prologue_cache))
|
|
return (struct cris_unwind_cache *) (*this_prologue_cache);
|
|
|
|
info = FRAME_OBSTACK_ZALLOC (struct cris_unwind_cache);
|
|
(*this_prologue_cache) = info;
|
|
info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
|
|
|
|
/* Zero all fields. */
|
|
info->prev_sp = 0;
|
|
info->base = 0;
|
|
info->size = 0;
|
|
info->sp_offset = 0;
|
|
info->r8_offset = 0;
|
|
info->uses_frame = 0;
|
|
info->return_pc = 0;
|
|
info->leaf_function = 0;
|
|
|
|
/* Prologue analysis does the rest... */
|
|
if (tdep->cris_version == 32)
|
|
crisv32_scan_prologue (get_frame_func (this_frame), this_frame, info);
|
|
else
|
|
cris_scan_prologue (get_frame_func (this_frame), this_frame, info);
|
|
|
|
return info;
|
|
}
|
|
|
|
/* Given a GDB frame, determine the address of the calling function's
|
|
frame. This will be used to create a new GDB frame struct. */
|
|
|
|
static void
|
|
cris_frame_this_id (frame_info_ptr this_frame,
|
|
void **this_prologue_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
struct cris_unwind_cache *info
|
|
= cris_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
CORE_ADDR base;
|
|
CORE_ADDR func;
|
|
struct frame_id id;
|
|
|
|
/* The FUNC is easy. */
|
|
func = get_frame_func (this_frame);
|
|
|
|
/* Hopefully the prologue analysis either correctly determined the
|
|
frame's base (which is the SP from the previous frame), or set
|
|
that base to "NULL". */
|
|
base = info->prev_sp;
|
|
if (base == 0)
|
|
return;
|
|
|
|
id = frame_id_build (base, func);
|
|
|
|
(*this_id) = id;
|
|
}
|
|
|
|
static struct value *
|
|
cris_frame_prev_register (frame_info_ptr this_frame,
|
|
void **this_prologue_cache, int regnum)
|
|
{
|
|
struct cris_unwind_cache *info
|
|
= cris_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
cris_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
|
|
{
|
|
/* Align to the size of an instruction (so that they can safely be
|
|
pushed onto the stack). */
|
|
return sp & ~3;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
cris_push_dummy_code (struct gdbarch *gdbarch,
|
|
CORE_ADDR sp, CORE_ADDR funaddr,
|
|
struct value **args, int nargs,
|
|
struct type *value_type,
|
|
CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
|
|
struct regcache *regcache)
|
|
{
|
|
/* Allocate space sufficient for a breakpoint. */
|
|
sp = (sp - 4) & ~3;
|
|
/* Store the address of that breakpoint */
|
|
*bp_addr = sp;
|
|
/* CRIS always starts the call at the callee's entry point. */
|
|
*real_pc = funaddr;
|
|
return sp;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
cris_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
|
|
struct regcache *regcache, CORE_ADDR bp_addr,
|
|
int nargs, struct value **args, CORE_ADDR sp,
|
|
function_call_return_method return_method,
|
|
CORE_ADDR struct_addr)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
int argreg;
|
|
int argnum;
|
|
|
|
struct cris_stack_item *si = NULL;
|
|
|
|
/* Push the return address. */
|
|
regcache_cooked_write_unsigned (regcache, SRP_REGNUM, bp_addr);
|
|
|
|
/* Are we returning a value using a structure return or a normal value
|
|
return? struct_addr is the address of the reserved space for the return
|
|
structure to be written on the stack. */
|
|
if (return_method == return_method_struct)
|
|
regcache_cooked_write_unsigned (regcache, STR_REGNUM, struct_addr);
|
|
|
|
/* Now load as many as possible of the first arguments into registers,
|
|
and push the rest onto the stack. */
|
|
argreg = ARG1_REGNUM;
|
|
|
|
for (argnum = 0; argnum < nargs; argnum++)
|
|
{
|
|
int len;
|
|
const gdb_byte *val;
|
|
int reg_demand;
|
|
int i;
|
|
|
|
len = value_type (args[argnum])->length ();
|
|
val = value_contents (args[argnum]).data ();
|
|
|
|
/* How may registers worth of storage do we need for this argument? */
|
|
reg_demand = (len / 4) + (len % 4 != 0 ? 1 : 0);
|
|
|
|
if (len <= (2 * 4) && (argreg + reg_demand - 1 <= ARG4_REGNUM))
|
|
{
|
|
/* Data passed by value. Fits in available register(s). */
|
|
for (i = 0; i < reg_demand; i++)
|
|
{
|
|
regcache->cooked_write (argreg, val);
|
|
argreg++;
|
|
val += 4;
|
|
}
|
|
}
|
|
else if (len <= (2 * 4) && argreg <= ARG4_REGNUM)
|
|
{
|
|
/* Data passed by value. Does not fit in available register(s).
|
|
Use the register(s) first, then the stack. */
|
|
for (i = 0; i < reg_demand; i++)
|
|
{
|
|
if (argreg <= ARG4_REGNUM)
|
|
{
|
|
regcache->cooked_write (argreg, val);
|
|
argreg++;
|
|
val += 4;
|
|
}
|
|
else
|
|
{
|
|
/* Push item for later so that pushed arguments
|
|
come in the right order. */
|
|
si = push_stack_item (si, val, 4);
|
|
val += 4;
|
|
}
|
|
}
|
|
}
|
|
else if (len > (2 * 4))
|
|
{
|
|
/* Data passed by reference. Push copy of data onto stack
|
|
and pass pointer to this copy as argument. */
|
|
sp = (sp - len) & ~3;
|
|
write_memory (sp, val, len);
|
|
|
|
if (argreg <= ARG4_REGNUM)
|
|
{
|
|
regcache_cooked_write_unsigned (regcache, argreg, sp);
|
|
argreg++;
|
|
}
|
|
else
|
|
{
|
|
gdb_byte buf[4];
|
|
store_unsigned_integer (buf, 4, byte_order, sp);
|
|
si = push_stack_item (si, buf, 4);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Data passed by value. No available registers. Put it on
|
|
the stack. */
|
|
si = push_stack_item (si, val, len);
|
|
}
|
|
}
|
|
|
|
while (si)
|
|
{
|
|
/* fp_arg must be word-aligned (i.e., don't += len) to match
|
|
the function prologue. */
|
|
sp = (sp - si->len) & ~3;
|
|
write_memory (sp, si->data, si->len);
|
|
si = pop_stack_item (si);
|
|
}
|
|
|
|
/* Finally, update the SP register. */
|
|
regcache_cooked_write_unsigned (regcache, gdbarch_sp_regnum (gdbarch), sp);
|
|
|
|
return sp;
|
|
}
|
|
|
|
static const struct frame_unwind cris_frame_unwind =
|
|
{
|
|
"cris prologue",
|
|
NORMAL_FRAME,
|
|
default_frame_unwind_stop_reason,
|
|
cris_frame_this_id,
|
|
cris_frame_prev_register,
|
|
NULL,
|
|
default_frame_sniffer
|
|
};
|
|
|
|
static CORE_ADDR
|
|
cris_frame_base_address (frame_info_ptr this_frame, void **this_cache)
|
|
{
|
|
struct cris_unwind_cache *info
|
|
= cris_frame_unwind_cache (this_frame, this_cache);
|
|
return info->base;
|
|
}
|
|
|
|
static const struct frame_base cris_frame_base =
|
|
{
|
|
&cris_frame_unwind,
|
|
cris_frame_base_address,
|
|
cris_frame_base_address,
|
|
cris_frame_base_address
|
|
};
|
|
|
|
/* Frames information. The definition of the struct frame_info is
|
|
|
|
CORE_ADDR frame
|
|
CORE_ADDR pc
|
|
enum frame_type type;
|
|
CORE_ADDR return_pc
|
|
int leaf_function
|
|
|
|
If the compilation option -fno-omit-frame-pointer is present the
|
|
variable frame will be set to the content of R8 which is the frame
|
|
pointer register.
|
|
|
|
The variable pc contains the address where execution is performed
|
|
in the present frame. The innermost frame contains the current content
|
|
of the register PC. All other frames contain the content of the
|
|
register PC in the next frame.
|
|
|
|
The variable `type' indicates the frame's type: normal, SIGTRAMP
|
|
(associated with a signal handler), dummy (associated with a dummy
|
|
frame).
|
|
|
|
The variable return_pc contains the address where execution should be
|
|
resumed when the present frame has finished, the return address.
|
|
|
|
The variable leaf_function is 1 if the return address is in the register
|
|
SRP, and 0 if it is on the stack.
|
|
|
|
Prologue instructions C-code.
|
|
The prologue may consist of (-fno-omit-frame-pointer)
|
|
1) 2)
|
|
push srp
|
|
push r8 push r8
|
|
move.d sp,r8 move.d sp,r8
|
|
subq X,sp subq X,sp
|
|
movem rY,[sp] movem rY,[sp]
|
|
move.S rZ,[r8-U] move.S rZ,[r8-U]
|
|
|
|
where 1 is a non-terminal function, and 2 is a leaf-function.
|
|
|
|
Note that this assumption is extremely brittle, and will break at the
|
|
slightest change in GCC's prologue.
|
|
|
|
If local variables are declared or register contents are saved on stack
|
|
the subq-instruction will be present with X as the number of bytes
|
|
needed for storage. The reshuffle with respect to r8 may be performed
|
|
with any size S (b, w, d) and any of the general registers Z={0..13}.
|
|
The offset U should be representable by a signed 8-bit value in all cases.
|
|
Thus, the prefix word is assumed to be immediate byte offset mode followed
|
|
by another word containing the instruction.
|
|
|
|
Degenerate cases:
|
|
3)
|
|
push r8
|
|
move.d sp,r8
|
|
move.d r8,sp
|
|
pop r8
|
|
|
|
Prologue instructions C++-code.
|
|
Case 1) and 2) in the C-code may be followed by
|
|
|
|
move.d r10,rS ; this
|
|
move.d r11,rT ; P1
|
|
move.d r12,rU ; P2
|
|
move.d r13,rV ; P3
|
|
move.S [r8+U],rZ ; P4
|
|
|
|
if any of the call parameters are stored. The host expects these
|
|
instructions to be executed in order to get the call parameters right. */
|
|
|
|
/* Examine the prologue of a function. The variable ip is the address of
|
|
the first instruction of the prologue. The variable limit is the address
|
|
of the first instruction after the prologue. The variable fi contains the
|
|
information in struct frame_info. The variable frameless_p controls whether
|
|
the entire prologue is examined (0) or just enough instructions to
|
|
determine that it is a prologue (1). */
|
|
|
|
static CORE_ADDR
|
|
cris_scan_prologue (CORE_ADDR pc, frame_info_ptr this_frame,
|
|
struct cris_unwind_cache *info)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
|
|
/* Present instruction. */
|
|
unsigned short insn;
|
|
|
|
/* Next instruction, lookahead. */
|
|
unsigned short insn_next;
|
|
int regno;
|
|
|
|
/* Number of byte on stack used for local variables and movem. */
|
|
int val;
|
|
|
|
/* Highest register number in a movem. */
|
|
int regsave;
|
|
|
|
/* move.d r<source_register>,rS */
|
|
short source_register;
|
|
|
|
/* Scan limit. */
|
|
int limit;
|
|
|
|
/* This frame is with respect to a leaf until a push srp is found. */
|
|
if (info)
|
|
{
|
|
info->leaf_function = 1;
|
|
}
|
|
|
|
/* Assume nothing on stack. */
|
|
val = 0;
|
|
regsave = -1;
|
|
|
|
/* If we were called without a this_frame, that means we were called
|
|
from cris_skip_prologue which already tried to find the end of the
|
|
prologue through the symbol information. 64 instructions past current
|
|
pc is arbitrarily chosen, but at least it means we'll stop eventually. */
|
|
limit = this_frame ? get_frame_pc (this_frame) : pc + 64;
|
|
|
|
/* Find the prologue instructions. */
|
|
while (pc > 0 && pc < limit)
|
|
{
|
|
insn = read_memory_unsigned_integer (pc, 2, byte_order);
|
|
pc += 2;
|
|
if (insn == 0xE1FC)
|
|
{
|
|
/* push <reg> 32 bit instruction. */
|
|
insn_next = read_memory_unsigned_integer (pc, 2, byte_order);
|
|
pc += 2;
|
|
regno = cris_get_operand2 (insn_next);
|
|
if (info)
|
|
{
|
|
info->sp_offset += 4;
|
|
}
|
|
/* This check, meant to recognize srp, used to be regno ==
|
|
(SRP_REGNUM - NUM_GENREGS), but that covers r11 also. */
|
|
if (insn_next == 0xBE7E)
|
|
{
|
|
if (info)
|
|
{
|
|
info->leaf_function = 0;
|
|
}
|
|
}
|
|
else if (insn_next == 0x8FEE)
|
|
{
|
|
/* push $r8 */
|
|
if (info)
|
|
{
|
|
info->r8_offset = info->sp_offset;
|
|
}
|
|
}
|
|
}
|
|
else if (insn == 0x866E)
|
|
{
|
|
/* move.d sp,r8 */
|
|
if (info)
|
|
{
|
|
info->uses_frame = 1;
|
|
}
|
|
continue;
|
|
}
|
|
else if (cris_get_operand2 (insn) == gdbarch_sp_regnum (gdbarch)
|
|
&& cris_get_mode (insn) == 0x0000
|
|
&& cris_get_opcode (insn) == 0x000A)
|
|
{
|
|
/* subq <val>,sp */
|
|
if (info)
|
|
{
|
|
info->sp_offset += cris_get_quick_value (insn);
|
|
}
|
|
}
|
|
else if (cris_get_mode (insn) == 0x0002
|
|
&& cris_get_opcode (insn) == 0x000F
|
|
&& cris_get_size (insn) == 0x0003
|
|
&& cris_get_operand1 (insn) == gdbarch_sp_regnum (gdbarch))
|
|
{
|
|
/* movem r<regsave>,[sp] */
|
|
regsave = cris_get_operand2 (insn);
|
|
}
|
|
else if (cris_get_operand2 (insn) == gdbarch_sp_regnum (gdbarch)
|
|
&& ((insn & 0x0F00) >> 8) == 0x0001
|
|
&& (cris_get_signed_offset (insn) < 0))
|
|
{
|
|
/* Immediate byte offset addressing prefix word with sp as base
|
|
register. Used for CRIS v8 i.e. ETRAX 100 and newer if <val>
|
|
is between 64 and 128.
|
|
movem r<regsave>,[sp=sp-<val>] */
|
|
if (info)
|
|
{
|
|
info->sp_offset += -cris_get_signed_offset (insn);
|
|
}
|
|
insn_next = read_memory_unsigned_integer (pc, 2, byte_order);
|
|
pc += 2;
|
|
if (cris_get_mode (insn_next) == PREFIX_ASSIGN_MODE
|
|
&& cris_get_opcode (insn_next) == 0x000F
|
|
&& cris_get_size (insn_next) == 0x0003
|
|
&& cris_get_operand1 (insn_next) == gdbarch_sp_regnum
|
|
(gdbarch))
|
|
{
|
|
regsave = cris_get_operand2 (insn_next);
|
|
}
|
|
else
|
|
{
|
|
/* The prologue ended before the limit was reached. */
|
|
pc -= 4;
|
|
break;
|
|
}
|
|
}
|
|
else if (cris_get_mode (insn) == 0x0001
|
|
&& cris_get_opcode (insn) == 0x0009
|
|
&& cris_get_size (insn) == 0x0002)
|
|
{
|
|
/* move.d r<10..13>,r<0..15> */
|
|
source_register = cris_get_operand1 (insn);
|
|
|
|
/* FIXME? In the glibc solibs, the prologue might contain something
|
|
like (this example taken from relocate_doit):
|
|
move.d $pc,$r0
|
|
sub.d 0xfffef426,$r0
|
|
which isn't covered by the source_register check below. Question
|
|
is whether to add a check for this combo, or make better use of
|
|
the limit variable instead. */
|
|
if (source_register < ARG1_REGNUM || source_register > ARG4_REGNUM)
|
|
{
|
|
/* The prologue ended before the limit was reached. */
|
|
pc -= 2;
|
|
break;
|
|
}
|
|
}
|
|
else if (cris_get_operand2 (insn) == CRIS_FP_REGNUM
|
|
/* The size is a fixed-size. */
|
|
&& ((insn & 0x0F00) >> 8) == 0x0001
|
|
/* A negative offset. */
|
|
&& (cris_get_signed_offset (insn) < 0))
|
|
{
|
|
/* move.S rZ,[r8-U] (?) */
|
|
insn_next = read_memory_unsigned_integer (pc, 2, byte_order);
|
|
pc += 2;
|
|
regno = cris_get_operand2 (insn_next);
|
|
if ((regno >= 0 && regno < gdbarch_sp_regnum (gdbarch))
|
|
&& cris_get_mode (insn_next) == PREFIX_OFFSET_MODE
|
|
&& cris_get_opcode (insn_next) == 0x000F)
|
|
{
|
|
/* move.S rZ,[r8-U] */
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
/* The prologue ended before the limit was reached. */
|
|
pc -= 4;
|
|
break;
|
|
}
|
|
}
|
|
else if (cris_get_operand2 (insn) == CRIS_FP_REGNUM
|
|
/* The size is a fixed-size. */
|
|
&& ((insn & 0x0F00) >> 8) == 0x0001
|
|
/* A positive offset. */
|
|
&& (cris_get_signed_offset (insn) > 0))
|
|
{
|
|
/* move.S [r8+U],rZ (?) */
|
|
insn_next = read_memory_unsigned_integer (pc, 2, byte_order);
|
|
pc += 2;
|
|
regno = cris_get_operand2 (insn_next);
|
|
if ((regno >= 0 && regno < gdbarch_sp_regnum (gdbarch))
|
|
&& cris_get_mode (insn_next) == PREFIX_OFFSET_MODE
|
|
&& cris_get_opcode (insn_next) == 0x0009
|
|
&& cris_get_operand1 (insn_next) == regno)
|
|
{
|
|
/* move.S [r8+U],rZ */
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
/* The prologue ended before the limit was reached. */
|
|
pc -= 4;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The prologue ended before the limit was reached. */
|
|
pc -= 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* We only want to know the end of the prologue when this_frame and info
|
|
are NULL (called from cris_skip_prologue i.e.). */
|
|
if (this_frame == NULL && info == NULL)
|
|
{
|
|
return pc;
|
|
}
|
|
|
|
info->size = info->sp_offset;
|
|
|
|
/* Compute the previous frame's stack pointer (which is also the
|
|
frame's ID's stack address), and this frame's base pointer. */
|
|
if (info->uses_frame)
|
|
{
|
|
ULONGEST this_base;
|
|
/* The SP was moved to the FP. This indicates that a new frame
|
|
was created. Get THIS frame's FP value by unwinding it from
|
|
the next frame. */
|
|
this_base = get_frame_register_unsigned (this_frame, CRIS_FP_REGNUM);
|
|
info->base = this_base;
|
|
info->saved_regs[CRIS_FP_REGNUM].set_addr (info->base);
|
|
|
|
/* The FP points at the last saved register. Adjust the FP back
|
|
to before the first saved register giving the SP. */
|
|
info->prev_sp = info->base + info->r8_offset;
|
|
}
|
|
else
|
|
{
|
|
ULONGEST this_base;
|
|
/* Assume that the FP is this frame's SP but with that pushed
|
|
stack space added back. */
|
|
this_base = get_frame_register_unsigned (this_frame,
|
|
gdbarch_sp_regnum (gdbarch));
|
|
info->base = this_base;
|
|
info->prev_sp = info->base + info->size;
|
|
}
|
|
|
|
/* Calculate the addresses for the saved registers on the stack. */
|
|
/* FIXME: The address calculation should really be done on the fly while
|
|
we're analyzing the prologue (we only hold one regsave value as it is
|
|
now). */
|
|
val = info->sp_offset;
|
|
|
|
for (regno = regsave; regno >= 0; regno--)
|
|
{
|
|
info->saved_regs[regno].set_addr (info->base + info->r8_offset - val);
|
|
val -= 4;
|
|
}
|
|
|
|
/* The previous frame's SP needed to be computed. Save the computed
|
|
value. */
|
|
info->saved_regs[gdbarch_sp_regnum (gdbarch)].set_value (info->prev_sp);
|
|
|
|
if (!info->leaf_function)
|
|
{
|
|
/* SRP saved on the stack. But where? */
|
|
if (info->r8_offset == 0)
|
|
{
|
|
/* R8 not pushed yet. */
|
|
info->saved_regs[SRP_REGNUM].set_addr (info->base);
|
|
}
|
|
else
|
|
{
|
|
/* R8 pushed, but SP may or may not be moved to R8 yet. */
|
|
info->saved_regs[SRP_REGNUM].set_addr (info->base + 4);
|
|
}
|
|
}
|
|
|
|
/* The PC is found in SRP (the actual register or located on the stack). */
|
|
info->saved_regs[gdbarch_pc_regnum (gdbarch)]
|
|
= info->saved_regs[SRP_REGNUM];
|
|
|
|
return pc;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
crisv32_scan_prologue (CORE_ADDR pc, frame_info_ptr this_frame,
|
|
struct cris_unwind_cache *info)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
ULONGEST this_base;
|
|
|
|
/* Unlike the CRISv10 prologue scanner (cris_scan_prologue), this is not
|
|
meant to be a full-fledged prologue scanner. It is only needed for
|
|
the cases where we end up in code always lacking DWARF-2 CFI, notably:
|
|
|
|
* PLT stubs (library calls)
|
|
* call dummys
|
|
* signal trampolines
|
|
|
|
For those cases, it is assumed that there is no actual prologue; that
|
|
the stack pointer is not adjusted, and (as a consequence) the return
|
|
address is not pushed onto the stack. */
|
|
|
|
/* We only want to know the end of the prologue when this_frame and info
|
|
are NULL (called from cris_skip_prologue i.e.). */
|
|
if (this_frame == NULL && info == NULL)
|
|
{
|
|
return pc;
|
|
}
|
|
|
|
/* The SP is assumed to be unaltered. */
|
|
this_base = get_frame_register_unsigned (this_frame,
|
|
gdbarch_sp_regnum (gdbarch));
|
|
info->base = this_base;
|
|
info->prev_sp = this_base;
|
|
|
|
/* The PC is assumed to be found in SRP. */
|
|
info->saved_regs[gdbarch_pc_regnum (gdbarch)]
|
|
= info->saved_regs[SRP_REGNUM];
|
|
|
|
return pc;
|
|
}
|
|
|
|
/* Advance pc beyond any function entry prologue instructions at pc
|
|
to reach some "real" code. */
|
|
|
|
/* Given a PC value corresponding to the start of a function, return the PC
|
|
of the first instruction after the function prologue. */
|
|
|
|
static CORE_ADDR
|
|
cris_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
|
|
{
|
|
cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
|
|
CORE_ADDR func_addr, func_end;
|
|
struct symtab_and_line sal;
|
|
CORE_ADDR pc_after_prologue;
|
|
|
|
/* If we have line debugging information, then the end of the prologue
|
|
should the first assembly instruction of the first source line. */
|
|
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
|
|
{
|
|
sal = find_pc_line (func_addr, 0);
|
|
if (sal.end > 0 && sal.end < func_end)
|
|
return sal.end;
|
|
}
|
|
|
|
if (tdep->cris_version == 32)
|
|
pc_after_prologue = crisv32_scan_prologue (pc, NULL, NULL);
|
|
else
|
|
pc_after_prologue = cris_scan_prologue (pc, NULL, NULL);
|
|
|
|
return pc_after_prologue;
|
|
}
|
|
|
|
/* Implement the breakpoint_kind_from_pc gdbarch method. */
|
|
|
|
static int
|
|
cris_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
|
|
{
|
|
return 2;
|
|
}
|
|
|
|
/* Implement the sw_breakpoint_from_kind gdbarch method. */
|
|
|
|
static const gdb_byte *
|
|
cris_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
|
|
{
|
|
cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
|
|
static unsigned char break8_insn[] = {0x38, 0xe9};
|
|
static unsigned char break15_insn[] = {0x3f, 0xe9};
|
|
|
|
*size = kind;
|
|
|
|
if (tdep->cris_mode == cris_mode_guru)
|
|
return break15_insn;
|
|
else
|
|
return break8_insn;
|
|
}
|
|
|
|
/* Returns 1 if spec_reg is applicable to the current gdbarch's CRIS version,
|
|
0 otherwise. */
|
|
|
|
static int
|
|
cris_spec_reg_applicable (struct gdbarch *gdbarch,
|
|
struct cris_spec_reg spec_reg)
|
|
{
|
|
cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
|
|
unsigned int version = tdep->cris_version;
|
|
|
|
switch (spec_reg.applicable_version)
|
|
{
|
|
case cris_ver_version_all:
|
|
return 1;
|
|
case cris_ver_warning:
|
|
/* Indeterminate/obsolete. */
|
|
return 0;
|
|
case cris_ver_v0_3:
|
|
return in_inclusive_range (version, 0U, 3U);
|
|
case cris_ver_v3p:
|
|
return (version >= 3);
|
|
case cris_ver_v8:
|
|
return in_inclusive_range (version, 8U, 9U);
|
|
case cris_ver_v8p:
|
|
return (version >= 8);
|
|
case cris_ver_v0_10:
|
|
return in_inclusive_range (version, 0U, 10U);
|
|
case cris_ver_v3_10:
|
|
return in_inclusive_range (version, 3U, 10U);
|
|
case cris_ver_v8_10:
|
|
return in_inclusive_range (version, 8U, 10U);
|
|
case cris_ver_v10:
|
|
return (version == 10);
|
|
case cris_ver_v10p:
|
|
return (version >= 10);
|
|
case cris_ver_v32p:
|
|
return (version >= 32);
|
|
default:
|
|
/* Invalid cris version. */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Returns the register size in unit byte. Returns 0 for an unimplemented
|
|
register, -1 for an invalid register. */
|
|
|
|
static int
|
|
cris_register_size (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
int i;
|
|
int spec_regno;
|
|
|
|
if (regno >= 0 && regno < NUM_GENREGS)
|
|
{
|
|
/* General registers (R0 - R15) are 32 bits. */
|
|
return 4;
|
|
}
|
|
else if (regno >= NUM_GENREGS && regno < (NUM_GENREGS + NUM_SPECREGS))
|
|
{
|
|
/* Special register (R16 - R31). cris_spec_regs is zero-based.
|
|
Adjust regno accordingly. */
|
|
spec_regno = regno - NUM_GENREGS;
|
|
|
|
for (i = 0; cris_spec_regs[i].name != NULL; i++)
|
|
{
|
|
if (cris_spec_regs[i].number == spec_regno
|
|
&& cris_spec_reg_applicable (gdbarch, cris_spec_regs[i]))
|
|
/* Go with the first applicable register. */
|
|
return cris_spec_regs[i].reg_size;
|
|
}
|
|
/* Special register not applicable to this CRIS version. */
|
|
return 0;
|
|
}
|
|
else if (regno >= gdbarch_pc_regnum (gdbarch)
|
|
&& regno < gdbarch_num_regs (gdbarch))
|
|
{
|
|
/* This will apply to CRISv32 only where there are additional registers
|
|
after the special registers (pseudo PC and support registers). */
|
|
return 4;
|
|
}
|
|
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Nonzero if regno should not be fetched from the target. This is the case
|
|
for unimplemented (size 0) and non-existant registers. */
|
|
|
|
static int
|
|
cris_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
return ((regno < 0 || regno >= gdbarch_num_regs (gdbarch))
|
|
|| (cris_register_size (gdbarch, regno) == 0));
|
|
}
|
|
|
|
/* Nonzero if regno should not be written to the target, for various
|
|
reasons. */
|
|
|
|
static int
|
|
cris_cannot_store_register (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
/* There are three kinds of registers we refuse to write to.
|
|
1. Those that not implemented.
|
|
2. Those that are read-only (depends on the processor mode).
|
|
3. Those registers to which a write has no effect. */
|
|
|
|
if (regno < 0
|
|
|| regno >= gdbarch_num_regs (gdbarch)
|
|
|| cris_register_size (gdbarch, regno) == 0)
|
|
/* Not implemented. */
|
|
return 1;
|
|
|
|
else if (regno == VR_REGNUM)
|
|
/* Read-only. */
|
|
return 1;
|
|
|
|
else if (regno == P0_REGNUM || regno == P4_REGNUM || regno == P8_REGNUM)
|
|
/* Writing has no effect. */
|
|
return 1;
|
|
|
|
/* IBR, BAR, BRP and IRP are read-only in user mode. Let the debug
|
|
agent decide whether they are writable. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Nonzero if regno should not be fetched from the target. This is the case
|
|
for unimplemented (size 0) and non-existant registers. */
|
|
|
|
static int
|
|
crisv32_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
return ((regno < 0 || regno >= gdbarch_num_regs (gdbarch))
|
|
|| (cris_register_size (gdbarch, regno) == 0));
|
|
}
|
|
|
|
/* Nonzero if regno should not be written to the target, for various
|
|
reasons. */
|
|
|
|
static int
|
|
crisv32_cannot_store_register (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
/* There are three kinds of registers we refuse to write to.
|
|
1. Those that not implemented.
|
|
2. Those that are read-only (depends on the processor mode).
|
|
3. Those registers to which a write has no effect. */
|
|
|
|
if (regno < 0
|
|
|| regno >= gdbarch_num_regs (gdbarch)
|
|
|| cris_register_size (gdbarch, regno) == 0)
|
|
/* Not implemented. */
|
|
return 1;
|
|
|
|
else if (regno == VR_REGNUM)
|
|
/* Read-only. */
|
|
return 1;
|
|
|
|
else if (regno == BZ_REGNUM || regno == WZ_REGNUM || regno == DZ_REGNUM)
|
|
/* Writing has no effect. */
|
|
return 1;
|
|
|
|
/* Many special registers are read-only in user mode. Let the debug
|
|
agent decide whether they are writable. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Return the GDB type (defined in gdbtypes.c) for the "standard" data type
|
|
of data in register regno. */
|
|
|
|
static struct type *
|
|
cris_register_type (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
if (regno == gdbarch_pc_regnum (gdbarch))
|
|
return builtin_type (gdbarch)->builtin_func_ptr;
|
|
else if (regno == gdbarch_sp_regnum (gdbarch)
|
|
|| regno == CRIS_FP_REGNUM)
|
|
return builtin_type (gdbarch)->builtin_data_ptr;
|
|
else if ((regno >= 0 && regno < gdbarch_sp_regnum (gdbarch))
|
|
|| (regno >= MOF_REGNUM && regno <= USP_REGNUM))
|
|
/* Note: R8 taken care of previous clause. */
|
|
return builtin_type (gdbarch)->builtin_uint32;
|
|
else if (regno >= P4_REGNUM && regno <= CCR_REGNUM)
|
|
return builtin_type (gdbarch)->builtin_uint16;
|
|
else if (regno >= P0_REGNUM && regno <= VR_REGNUM)
|
|
return builtin_type (gdbarch)->builtin_uint8;
|
|
else
|
|
/* Invalid (unimplemented) register. */
|
|
return builtin_type (gdbarch)->builtin_int0;
|
|
}
|
|
|
|
static struct type *
|
|
crisv32_register_type (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
if (regno == gdbarch_pc_regnum (gdbarch))
|
|
return builtin_type (gdbarch)->builtin_func_ptr;
|
|
else if (regno == gdbarch_sp_regnum (gdbarch)
|
|
|| regno == CRIS_FP_REGNUM)
|
|
return builtin_type (gdbarch)->builtin_data_ptr;
|
|
else if ((regno >= 0 && regno <= ACR_REGNUM)
|
|
|| (regno >= EXS_REGNUM && regno <= SPC_REGNUM)
|
|
|| (regno == PID_REGNUM)
|
|
|| (regno >= S0_REGNUM && regno <= S15_REGNUM))
|
|
/* Note: R8 and SP taken care of by previous clause. */
|
|
return builtin_type (gdbarch)->builtin_uint32;
|
|
else if (regno == WZ_REGNUM)
|
|
return builtin_type (gdbarch)->builtin_uint16;
|
|
else if (regno == BZ_REGNUM || regno == VR_REGNUM || regno == SRS_REGNUM)
|
|
return builtin_type (gdbarch)->builtin_uint8;
|
|
else
|
|
{
|
|
/* Invalid (unimplemented) register. Should not happen as there are
|
|
no unimplemented CRISv32 registers. */
|
|
warning (_("crisv32_register_type: unknown regno %d"), regno);
|
|
return builtin_type (gdbarch)->builtin_int0;
|
|
}
|
|
}
|
|
|
|
/* Stores a function return value of type type, where valbuf is the address
|
|
of the value to be stored. */
|
|
|
|
/* In the CRIS ABI, R10 and R11 are used to store return values. */
|
|
|
|
static void
|
|
cris_store_return_value (struct type *type, struct regcache *regcache,
|
|
const gdb_byte *valbuf)
|
|
{
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
ULONGEST val;
|
|
int len = type->length ();
|
|
|
|
if (len <= 4)
|
|
{
|
|
/* Put the return value in R10. */
|
|
val = extract_unsigned_integer (valbuf, len, byte_order);
|
|
regcache_cooked_write_unsigned (regcache, ARG1_REGNUM, val);
|
|
}
|
|
else if (len <= 8)
|
|
{
|
|
/* Put the return value in R10 and R11. */
|
|
val = extract_unsigned_integer (valbuf, 4, byte_order);
|
|
regcache_cooked_write_unsigned (regcache, ARG1_REGNUM, val);
|
|
val = extract_unsigned_integer (valbuf + 4, len - 4, byte_order);
|
|
regcache_cooked_write_unsigned (regcache, ARG2_REGNUM, val);
|
|
}
|
|
else
|
|
error (_("cris_store_return_value: type length too large."));
|
|
}
|
|
|
|
/* Return the name of register regno as a string. Return NULL for an
|
|
invalid or unimplemented register. */
|
|
|
|
static const char *
|
|
cris_special_register_name (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
int spec_regno;
|
|
int i;
|
|
|
|
/* Special register (R16 - R31). cris_spec_regs is zero-based.
|
|
Adjust regno accordingly. */
|
|
spec_regno = regno - NUM_GENREGS;
|
|
|
|
/* Assume nothing about the layout of the cris_spec_regs struct
|
|
when searching. */
|
|
for (i = 0; cris_spec_regs[i].name != NULL; i++)
|
|
{
|
|
if (cris_spec_regs[i].number == spec_regno
|
|
&& cris_spec_reg_applicable (gdbarch, cris_spec_regs[i]))
|
|
/* Go with the first applicable register. */
|
|
return cris_spec_regs[i].name;
|
|
}
|
|
/* Special register not applicable to this CRIS version. */
|
|
return "";
|
|
}
|
|
|
|
static const char *
|
|
cris_register_name (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
static const char *cris_genreg_names[] =
|
|
{ "r0", "r1", "r2", "r3", \
|
|
"r4", "r5", "r6", "r7", \
|
|
"r8", "r9", "r10", "r11", \
|
|
"r12", "r13", "sp", "pc" };
|
|
|
|
if (regno < NUM_GENREGS)
|
|
{
|
|
/* General register. */
|
|
gdb_static_assert (ARRAY_SIZE (cris_genreg_names) == NUM_GENREGS);
|
|
return cris_genreg_names[regno];
|
|
}
|
|
else if (regno >= NUM_GENREGS && regno < gdbarch_num_regs (gdbarch))
|
|
{
|
|
return cris_special_register_name (gdbarch, regno);
|
|
}
|
|
else
|
|
{
|
|
/* Invalid register. */
|
|
return "";
|
|
}
|
|
}
|
|
|
|
static const char *
|
|
crisv32_register_name (struct gdbarch *gdbarch, int regno)
|
|
{
|
|
static const char *crisv32_genreg_names[] =
|
|
{ "r0", "r1", "r2", "r3", \
|
|
"r4", "r5", "r6", "r7", \
|
|
"r8", "r9", "r10", "r11", \
|
|
"r12", "r13", "sp", "acr"
|
|
};
|
|
|
|
static const char *crisv32_sreg_names[] =
|
|
{ "s0", "s1", "s2", "s3", \
|
|
"s4", "s5", "s6", "s7", \
|
|
"s8", "s9", "s10", "s11", \
|
|
"s12", "s13", "s14", "s15"
|
|
};
|
|
|
|
if (regno >= 0 && regno < NUM_GENREGS)
|
|
{
|
|
/* General register. */
|
|
return crisv32_genreg_names[regno];
|
|
}
|
|
else if (regno >= NUM_GENREGS && regno < (NUM_GENREGS + NUM_SPECREGS))
|
|
{
|
|
return cris_special_register_name (gdbarch, regno);
|
|
}
|
|
else if (regno == gdbarch_pc_regnum (gdbarch))
|
|
{
|
|
return "pc";
|
|
}
|
|
else if (regno >= S0_REGNUM && regno <= S15_REGNUM)
|
|
{
|
|
return crisv32_sreg_names[regno - S0_REGNUM];
|
|
}
|
|
else
|
|
{
|
|
/* Invalid register. */
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Convert DWARF register number REG to the appropriate register
|
|
number used by GDB. */
|
|
|
|
static int
|
|
cris_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int reg)
|
|
{
|
|
/* We need to re-map a couple of registers (SRP is 16 in Dwarf-2 register
|
|
numbering, MOF is 18).
|
|
Adapted from gcc/config/cris/cris.h. */
|
|
static int cris_dwarf_regmap[] = {
|
|
0, 1, 2, 3,
|
|
4, 5, 6, 7,
|
|
8, 9, 10, 11,
|
|
12, 13, 14, 15,
|
|
27, -1, -1, -1,
|
|
-1, -1, -1, 23,
|
|
-1, -1, -1, 27,
|
|
-1, -1, -1, -1
|
|
};
|
|
int regnum = -1;
|
|
|
|
if (reg >= 0 && reg < ARRAY_SIZE (cris_dwarf_regmap))
|
|
regnum = cris_dwarf_regmap[reg];
|
|
|
|
return regnum;
|
|
}
|
|
|
|
/* DWARF-2 frame support. */
|
|
|
|
static void
|
|
cris_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
|
|
struct dwarf2_frame_state_reg *reg,
|
|
frame_info_ptr this_frame)
|
|
{
|
|
/* The return address column. */
|
|
if (regnum == gdbarch_pc_regnum (gdbarch))
|
|
reg->how = DWARF2_FRAME_REG_RA;
|
|
|
|
/* The call frame address. */
|
|
else if (regnum == gdbarch_sp_regnum (gdbarch))
|
|
reg->how = DWARF2_FRAME_REG_CFA;
|
|
}
|
|
|
|
/* Extract from an array regbuf containing the raw register state a function
|
|
return value of type type, and copy that, in virtual format, into
|
|
valbuf. */
|
|
|
|
/* In the CRIS ABI, R10 and R11 are used to store return values. */
|
|
|
|
static void
|
|
cris_extract_return_value (struct type *type, struct regcache *regcache,
|
|
gdb_byte *valbuf)
|
|
{
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
ULONGEST val;
|
|
int len = type->length ();
|
|
|
|
if (len <= 4)
|
|
{
|
|
/* Get the return value from R10. */
|
|
regcache_cooked_read_unsigned (regcache, ARG1_REGNUM, &val);
|
|
store_unsigned_integer (valbuf, len, byte_order, val);
|
|
}
|
|
else if (len <= 8)
|
|
{
|
|
/* Get the return value from R10 and R11. */
|
|
regcache_cooked_read_unsigned (regcache, ARG1_REGNUM, &val);
|
|
store_unsigned_integer (valbuf, 4, byte_order, val);
|
|
regcache_cooked_read_unsigned (regcache, ARG2_REGNUM, &val);
|
|
store_unsigned_integer (valbuf + 4, len - 4, byte_order, val);
|
|
}
|
|
else
|
|
error (_("cris_extract_return_value: type length too large"));
|
|
}
|
|
|
|
/* Handle the CRIS return value convention. */
|
|
|
|
static enum return_value_convention
|
|
cris_return_value (struct gdbarch *gdbarch, struct value *function,
|
|
struct type *type, struct regcache *regcache,
|
|
gdb_byte *readbuf, const gdb_byte *writebuf)
|
|
{
|
|
if (type->code () == TYPE_CODE_STRUCT
|
|
|| type->code () == TYPE_CODE_UNION
|
|
|| type->length () > 8)
|
|
/* Structs, unions, and anything larger than 8 bytes (2 registers)
|
|
goes on the stack. */
|
|
return RETURN_VALUE_STRUCT_CONVENTION;
|
|
|
|
if (readbuf)
|
|
cris_extract_return_value (type, regcache, readbuf);
|
|
if (writebuf)
|
|
cris_store_return_value (type, regcache, writebuf);
|
|
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
|
}
|
|
|
|
/* Calculates a value that measures how good inst_args constraints an
|
|
instruction. It stems from cris_constraint, found in cris-dis.c. */
|
|
|
|
static int
|
|
constraint (unsigned int insn, const char *inst_args,
|
|
inst_env_type *inst_env)
|
|
{
|
|
int retval = 0;
|
|
int tmp, i;
|
|
|
|
const gdb_byte *s = (const gdb_byte *) inst_args;
|
|
|
|
for (; *s; s++)
|
|
switch (*s)
|
|
{
|
|
case 'm':
|
|
if ((insn & 0x30) == 0x30)
|
|
return -1;
|
|
break;
|
|
|
|
case 'S':
|
|
/* A prefix operand. */
|
|
if (inst_env->prefix_found)
|
|
break;
|
|
else
|
|
return -1;
|
|
|
|
case 'B':
|
|
/* A "push" prefix. (This check was REMOVED by san 970921.) Check for
|
|
valid "push" size. In case of special register, it may be != 4. */
|
|
if (inst_env->prefix_found)
|
|
break;
|
|
else
|
|
return -1;
|
|
|
|
case 'D':
|
|
retval = (((insn >> 0xC) & 0xF) == (insn & 0xF));
|
|
if (!retval)
|
|
return -1;
|
|
else
|
|
retval += 4;
|
|
break;
|
|
|
|
case 'P':
|
|
tmp = (insn >> 0xC) & 0xF;
|
|
|
|
for (i = 0; cris_spec_regs[i].name != NULL; i++)
|
|
{
|
|
/* Since we match four bits, we will give a value of
|
|
4 - 1 = 3 in a match. If there is a corresponding
|
|
exact match of a special register in another pattern, it
|
|
will get a value of 4, which will be higher. This should
|
|
be correct in that an exact pattern would match better that
|
|
a general pattern.
|
|
Note that there is a reason for not returning zero; the
|
|
pattern for "clear" is partly matched in the bit-pattern
|
|
(the two lower bits must be zero), while the bit-pattern
|
|
for a move from a special register is matched in the
|
|
register constraint.
|
|
This also means we will will have a race condition if
|
|
there is a partly match in three bits in the bit pattern. */
|
|
if (tmp == cris_spec_regs[i].number)
|
|
{
|
|
retval += 3;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (cris_spec_regs[i].name == NULL)
|
|
return -1;
|
|
break;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/* Returns the number of bits set in the variable value. */
|
|
|
|
static int
|
|
number_of_bits (unsigned int value)
|
|
{
|
|
int number_of_bits = 0;
|
|
|
|
while (value != 0)
|
|
{
|
|
number_of_bits += 1;
|
|
value &= (value - 1);
|
|
}
|
|
return number_of_bits;
|
|
}
|
|
|
|
/* Finds the address that should contain the single step breakpoint(s).
|
|
It stems from code in cris-dis.c. */
|
|
|
|
static int
|
|
find_cris_op (unsigned short insn, inst_env_type *inst_env)
|
|
{
|
|
int i;
|
|
int max_level_of_match = -1;
|
|
int max_matched = -1;
|
|
int level_of_match;
|
|
|
|
for (i = 0; cris_opcodes[i].name != NULL; i++)
|
|
{
|
|
if (((cris_opcodes[i].match & insn) == cris_opcodes[i].match)
|
|
&& ((cris_opcodes[i].lose & insn) == 0)
|
|
/* Only CRISv10 instructions, please. */
|
|
&& (cris_opcodes[i].applicable_version != cris_ver_v32p))
|
|
{
|
|
level_of_match = constraint (insn, cris_opcodes[i].args, inst_env);
|
|
if (level_of_match >= 0)
|
|
{
|
|
level_of_match +=
|
|
number_of_bits (cris_opcodes[i].match | cris_opcodes[i].lose);
|
|
if (level_of_match > max_level_of_match)
|
|
{
|
|
max_matched = i;
|
|
max_level_of_match = level_of_match;
|
|
if (level_of_match == 16)
|
|
{
|
|
/* All bits matched, cannot find better. */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return max_matched;
|
|
}
|
|
|
|
/* Attempts to find single-step breakpoints. Returns -1 on failure which is
|
|
actually an internal error. */
|
|
|
|
static int
|
|
find_step_target (struct regcache *regcache, inst_env_type *inst_env)
|
|
{
|
|
int i;
|
|
int offset;
|
|
unsigned short insn;
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
|
|
/* Create a local register image and set the initial state. */
|
|
for (i = 0; i < NUM_GENREGS; i++)
|
|
{
|
|
inst_env->reg[i] =
|
|
(unsigned long) regcache_raw_get_unsigned (regcache, i);
|
|
}
|
|
offset = NUM_GENREGS;
|
|
for (i = 0; i < NUM_SPECREGS; i++)
|
|
{
|
|
inst_env->preg[i] =
|
|
(unsigned long) regcache_raw_get_unsigned (regcache, offset + i);
|
|
}
|
|
inst_env->branch_found = 0;
|
|
inst_env->slot_needed = 0;
|
|
inst_env->delay_slot_pc_active = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->invalid = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
inst_env->byte_order = byte_order;
|
|
|
|
/* Look for a step target. */
|
|
do
|
|
{
|
|
/* Read an instruction from the client. */
|
|
insn = read_memory_unsigned_integer
|
|
(inst_env->reg[gdbarch_pc_regnum (gdbarch)], 2, byte_order);
|
|
|
|
/* If the instruction is not in a delay slot the new content of the
|
|
PC is [PC] + 2. If the instruction is in a delay slot it is not
|
|
that simple. Since a instruction in a delay slot cannot change
|
|
the content of the PC, it does not matter what value PC will have.
|
|
Just make sure it is a valid instruction. */
|
|
if (!inst_env->delay_slot_pc_active)
|
|
{
|
|
inst_env->reg[gdbarch_pc_regnum (gdbarch)] += 2;
|
|
}
|
|
else
|
|
{
|
|
inst_env->delay_slot_pc_active = 0;
|
|
inst_env->reg[gdbarch_pc_regnum (gdbarch)]
|
|
= inst_env->delay_slot_pc;
|
|
}
|
|
/* Analyse the present instruction. */
|
|
i = find_cris_op (insn, inst_env);
|
|
if (i == -1)
|
|
{
|
|
inst_env->invalid = 1;
|
|
}
|
|
else
|
|
{
|
|
cris_gdb_func (gdbarch, cris_opcodes[i].op, insn, inst_env);
|
|
}
|
|
} while (!inst_env->invalid
|
|
&& (inst_env->prefix_found || inst_env->xflag_found
|
|
|| inst_env->slot_needed));
|
|
return i;
|
|
}
|
|
|
|
/* There is no hardware single-step support. The function find_step_target
|
|
digs through the opcodes in order to find all possible targets.
|
|
Either one ordinary target or two targets for branches may be found. */
|
|
|
|
static std::vector<CORE_ADDR>
|
|
cris_software_single_step (struct regcache *regcache)
|
|
{
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
inst_env_type inst_env;
|
|
std::vector<CORE_ADDR> next_pcs;
|
|
|
|
/* Analyse the present instruction environment and insert
|
|
breakpoints. */
|
|
int status = find_step_target (regcache, &inst_env);
|
|
if (status == -1)
|
|
{
|
|
/* Could not find a target. Things are likely to go downhill
|
|
from here. */
|
|
warning (_("CRIS software single step could not find a step target."));
|
|
}
|
|
else
|
|
{
|
|
/* Insert at most two breakpoints. One for the next PC content
|
|
and possibly another one for a branch, jump, etc. */
|
|
CORE_ADDR next_pc
|
|
= (CORE_ADDR) inst_env.reg[gdbarch_pc_regnum (gdbarch)];
|
|
|
|
next_pcs.push_back (next_pc);
|
|
if (inst_env.branch_found
|
|
&& (CORE_ADDR) inst_env.branch_break_address != next_pc)
|
|
{
|
|
CORE_ADDR branch_target_address
|
|
= (CORE_ADDR) inst_env.branch_break_address;
|
|
|
|
next_pcs.push_back (branch_target_address);
|
|
}
|
|
}
|
|
|
|
return next_pcs;
|
|
}
|
|
|
|
/* Calculates the prefix value for quick offset addressing mode. */
|
|
|
|
static void
|
|
quick_mode_bdap_prefix (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to be in a delay slot. You can't have a prefix to this
|
|
instruction (not 100% sure). */
|
|
if (inst_env->slot_needed || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->prefix_value = inst_env->reg[cris_get_operand2 (inst)];
|
|
inst_env->prefix_value += cris_get_bdap_quick_offset (inst);
|
|
|
|
/* A prefix doesn't change the xflag_found. But the rest of the flags
|
|
need updating. */
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 1;
|
|
}
|
|
|
|
/* Updates the autoincrement register. The size of the increment is derived
|
|
from the size of the operation. The PC is always kept aligned on even
|
|
word addresses. */
|
|
|
|
static void
|
|
process_autoincrement (int size, unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
if (size == INST_BYTE_SIZE)
|
|
{
|
|
inst_env->reg[cris_get_operand1 (inst)] += 1;
|
|
|
|
/* The PC must be word aligned, so increase the PC with one
|
|
word even if the size is byte. */
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
inst_env->reg[REG_PC] += 1;
|
|
}
|
|
}
|
|
else if (size == INST_WORD_SIZE)
|
|
{
|
|
inst_env->reg[cris_get_operand1 (inst)] += 2;
|
|
}
|
|
else if (size == INST_DWORD_SIZE)
|
|
{
|
|
inst_env->reg[cris_get_operand1 (inst)] += 4;
|
|
}
|
|
else
|
|
{
|
|
/* Invalid size. */
|
|
inst_env->invalid = 1;
|
|
}
|
|
}
|
|
|
|
/* Just a forward declaration. */
|
|
|
|
static unsigned long get_data_from_address (unsigned short *inst,
|
|
CORE_ADDR address,
|
|
enum bfd_endian byte_order);
|
|
|
|
/* Calculates the prefix value for the general case of offset addressing
|
|
mode. */
|
|
|
|
static void
|
|
bdap_prefix (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to be in a delay slot. */
|
|
if (inst_env->slot_needed || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* The calculation of prefix_value used to be after process_autoincrement,
|
|
but that fails for an instruction such as jsr [$r0+12] which is encoded
|
|
as 5f0d 0c00 30b9 when compiled with -fpic. Since PC is operand1 it
|
|
mustn't be incremented until we have read it and what it points at. */
|
|
inst_env->prefix_value = inst_env->reg[cris_get_operand2 (inst)];
|
|
|
|
/* The offset is an indirection of the contents of the operand1 register. */
|
|
inst_env->prefix_value +=
|
|
get_data_from_address (&inst, inst_env->reg[cris_get_operand1 (inst)],
|
|
inst_env->byte_order);
|
|
|
|
if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
process_autoincrement (cris_get_size (inst), inst, inst_env);
|
|
}
|
|
|
|
/* A prefix doesn't change the xflag_found. But the rest of the flags
|
|
need updating. */
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 1;
|
|
}
|
|
|
|
/* Calculates the prefix value for the index addressing mode. */
|
|
|
|
static void
|
|
biap_prefix (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to be in a delay slot. I can't see that it's possible to
|
|
have a prefix to this instruction. So I will treat this as invalid. */
|
|
if (inst_env->slot_needed || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->prefix_value = inst_env->reg[cris_get_operand1 (inst)];
|
|
|
|
/* The offset is the operand2 value shifted the size of the instruction
|
|
to the left. */
|
|
inst_env->prefix_value +=
|
|
inst_env->reg[cris_get_operand2 (inst)] << cris_get_size (inst);
|
|
|
|
/* If the PC is operand1 (base) the address used is the address after
|
|
the main instruction, i.e. address + 2 (the PC is already compensated
|
|
for the prefix operation). */
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
inst_env->prefix_value += 2;
|
|
}
|
|
|
|
/* A prefix doesn't change the xflag_found. But the rest of the flags
|
|
need updating. */
|
|
inst_env->slot_needed = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->prefix_found = 1;
|
|
}
|
|
|
|
/* Calculates the prefix value for the double indirect addressing mode. */
|
|
|
|
static void
|
|
dip_prefix (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
|
|
CORE_ADDR address;
|
|
|
|
/* It's invalid to be in a delay slot. */
|
|
if (inst_env->slot_needed || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* The prefix value is one dereference of the contents of the operand1
|
|
register. */
|
|
address = (CORE_ADDR) inst_env->reg[cris_get_operand1 (inst)];
|
|
inst_env->prefix_value
|
|
= read_memory_unsigned_integer (address, 4, inst_env->byte_order);
|
|
|
|
/* Check if the mode is autoincrement. */
|
|
if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
inst_env->reg[cris_get_operand1 (inst)] += 4;
|
|
}
|
|
|
|
/* A prefix doesn't change the xflag_found. But the rest of the flags
|
|
need updating. */
|
|
inst_env->slot_needed = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->prefix_found = 1;
|
|
}
|
|
|
|
/* Finds the destination for a branch with 8-bits offset. */
|
|
|
|
static void
|
|
eight_bit_offset_branch_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
|
|
short offset;
|
|
|
|
/* If we have a prefix or are in a delay slot it's bad. */
|
|
if (inst_env->slot_needed || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* We have a branch, find out where the branch will land. */
|
|
offset = cris_get_branch_short_offset (inst);
|
|
|
|
/* Check if the offset is signed. */
|
|
if (offset & BRANCH_SIGNED_SHORT_OFFSET_MASK)
|
|
{
|
|
offset |= 0xFF00;
|
|
}
|
|
|
|
/* The offset ends with the sign bit, set it to zero. The address
|
|
should always be word aligned. */
|
|
offset &= ~BRANCH_SIGNED_SHORT_OFFSET_MASK;
|
|
|
|
inst_env->branch_found = 1;
|
|
inst_env->branch_break_address = inst_env->reg[REG_PC] + offset;
|
|
|
|
inst_env->slot_needed = 1;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Finds the destination for a branch with 16-bits offset. */
|
|
|
|
static void
|
|
sixteen_bit_offset_branch_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
short offset;
|
|
|
|
/* If we have a prefix or is in a delay slot it's bad. */
|
|
if (inst_env->slot_needed || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* We have a branch, find out the offset for the branch. */
|
|
offset = read_memory_integer (inst_env->reg[REG_PC], 2,
|
|
inst_env->byte_order);
|
|
|
|
/* The instruction is one word longer than normal, so add one word
|
|
to the PC. */
|
|
inst_env->reg[REG_PC] += 2;
|
|
|
|
inst_env->branch_found = 1;
|
|
inst_env->branch_break_address = inst_env->reg[REG_PC] + offset;
|
|
|
|
|
|
inst_env->slot_needed = 1;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles the ABS instruction. */
|
|
|
|
static void
|
|
abs_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
|
|
long value;
|
|
|
|
/* ABS can't have a prefix, so it's bad if it does. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Check if the operation affects the PC. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
|
|
/* It's invalid to change to the PC if we are in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
value = (long) inst_env->reg[REG_PC];
|
|
|
|
/* The value of abs (SIGNED_DWORD_MASK) is SIGNED_DWORD_MASK. */
|
|
if (value != SIGNED_DWORD_MASK)
|
|
{
|
|
value = -value;
|
|
inst_env->reg[REG_PC] = (long) value;
|
|
}
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the ADDI instruction. */
|
|
|
|
static void
|
|
addi_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to have the PC as base register. And ADDI can't have
|
|
a prefix. */
|
|
if (inst_env->prefix_found || (cris_get_operand1 (inst) == REG_PC))
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the ASR instruction. */
|
|
|
|
static void
|
|
asr_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
int shift_steps;
|
|
unsigned long value;
|
|
unsigned long signed_extend_mask = 0;
|
|
|
|
/* ASR can't have a prefix, so check that it doesn't. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Check if the PC is the target register. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* Get the number of bits to shift. */
|
|
shift_steps
|
|
= cris_get_asr_shift_steps (inst_env->reg[cris_get_operand1 (inst)]);
|
|
value = inst_env->reg[REG_PC];
|
|
|
|
/* Find out how many bits the operation should apply to. */
|
|
if (cris_get_size (inst) == INST_BYTE_SIZE)
|
|
{
|
|
if (value & SIGNED_BYTE_MASK)
|
|
{
|
|
signed_extend_mask = 0xFF;
|
|
signed_extend_mask = signed_extend_mask >> shift_steps;
|
|
signed_extend_mask = ~signed_extend_mask;
|
|
}
|
|
value = value >> shift_steps;
|
|
value |= signed_extend_mask;
|
|
value &= 0xFF;
|
|
inst_env->reg[REG_PC] &= 0xFFFFFF00;
|
|
inst_env->reg[REG_PC] |= value;
|
|
}
|
|
else if (cris_get_size (inst) == INST_WORD_SIZE)
|
|
{
|
|
if (value & SIGNED_WORD_MASK)
|
|
{
|
|
signed_extend_mask = 0xFFFF;
|
|
signed_extend_mask = signed_extend_mask >> shift_steps;
|
|
signed_extend_mask = ~signed_extend_mask;
|
|
}
|
|
value = value >> shift_steps;
|
|
value |= signed_extend_mask;
|
|
value &= 0xFFFF;
|
|
inst_env->reg[REG_PC] &= 0xFFFF0000;
|
|
inst_env->reg[REG_PC] |= value;
|
|
}
|
|
else if (cris_get_size (inst) == INST_DWORD_SIZE)
|
|
{
|
|
if (value & SIGNED_DWORD_MASK)
|
|
{
|
|
signed_extend_mask = 0xFFFFFFFF;
|
|
signed_extend_mask = signed_extend_mask >> shift_steps;
|
|
signed_extend_mask = ~signed_extend_mask;
|
|
}
|
|
value = value >> shift_steps;
|
|
value |= signed_extend_mask;
|
|
inst_env->reg[REG_PC] = value;
|
|
}
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the ASRQ instruction. */
|
|
|
|
static void
|
|
asrq_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
|
|
int shift_steps;
|
|
unsigned long value;
|
|
unsigned long signed_extend_mask = 0;
|
|
|
|
/* ASRQ can't have a prefix, so check that it doesn't. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Check if the PC is the target register. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* The shift size is given as a 5 bit quick value, i.e. we don't
|
|
want the sign bit of the quick value. */
|
|
shift_steps = cris_get_asr_shift_steps (inst);
|
|
value = inst_env->reg[REG_PC];
|
|
if (value & SIGNED_DWORD_MASK)
|
|
{
|
|
signed_extend_mask = 0xFFFFFFFF;
|
|
signed_extend_mask = signed_extend_mask >> shift_steps;
|
|
signed_extend_mask = ~signed_extend_mask;
|
|
}
|
|
value = value >> shift_steps;
|
|
value |= signed_extend_mask;
|
|
inst_env->reg[REG_PC] = value;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the AX, EI and SETF instruction. */
|
|
|
|
static void
|
|
ax_ei_setf_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* Check if the instruction is setting the X flag. */
|
|
if (cris_is_xflag_bit_on (inst))
|
|
{
|
|
inst_env->xflag_found = 1;
|
|
}
|
|
else
|
|
{
|
|
inst_env->xflag_found = 0;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Checks if the instruction is in assign mode. If so, it updates the assign
|
|
register. Note that check_assign assumes that the caller has checked that
|
|
there is a prefix to this instruction. The mode check depends on this. */
|
|
|
|
static void
|
|
check_assign (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* Check if it's an assign addressing mode. */
|
|
if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE)
|
|
{
|
|
/* Assign the prefix value to operand 1. */
|
|
inst_env->reg[cris_get_operand1 (inst)] = inst_env->prefix_value;
|
|
}
|
|
}
|
|
|
|
/* Handles the 2-operand BOUND instruction. */
|
|
|
|
static void
|
|
two_operand_bound_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to have the PC as the index operand. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* Check if we have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
check_assign (inst, inst_env);
|
|
}
|
|
/* Check if this is an autoincrement mode. */
|
|
else if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
process_autoincrement (cris_get_size (inst), inst, inst_env);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the 3-operand BOUND instruction. */
|
|
|
|
static void
|
|
three_operand_bound_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's an error if we haven't got a prefix. And it's also an error
|
|
if the PC is the destination register. */
|
|
if ((!inst_env->prefix_found) || (cris_get_operand1 (inst) == REG_PC))
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Clears the status flags in inst_env. */
|
|
|
|
static void
|
|
btst_nop_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's an error if we have got a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Clears the status flags in inst_env. */
|
|
|
|
static void
|
|
clearf_di_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's an error if we have got a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles the CLEAR instruction if it's in register mode. */
|
|
|
|
static void
|
|
reg_mode_clear_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* Check if the target is the PC. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
/* The instruction will clear the instruction's size bits. */
|
|
int clear_size = cris_get_clear_size (inst);
|
|
if (clear_size == INST_BYTE_SIZE)
|
|
{
|
|
inst_env->delay_slot_pc = inst_env->reg[REG_PC] & 0xFFFFFF00;
|
|
}
|
|
if (clear_size == INST_WORD_SIZE)
|
|
{
|
|
inst_env->delay_slot_pc = inst_env->reg[REG_PC] & 0xFFFF0000;
|
|
}
|
|
if (clear_size == INST_DWORD_SIZE)
|
|
{
|
|
inst_env->delay_slot_pc = 0x0;
|
|
}
|
|
/* The jump will be delayed with one delay slot. So we need a delay
|
|
slot. */
|
|
inst_env->slot_needed = 1;
|
|
inst_env->delay_slot_pc_active = 1;
|
|
}
|
|
else
|
|
{
|
|
/* The PC will not change => no delay slot. */
|
|
inst_env->slot_needed = 0;
|
|
}
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the TEST instruction if it's in register mode. */
|
|
|
|
static void
|
|
reg_mode_test_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's an error if we have got a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
|
|
}
|
|
|
|
/* Handles the CLEAR and TEST instruction if the instruction isn't
|
|
in register mode. */
|
|
|
|
static void
|
|
none_reg_mode_clear_test_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* Check if we are in a prefix mode. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
/* The only way the PC can change is if this instruction is in
|
|
assign addressing mode. */
|
|
check_assign (inst, inst_env);
|
|
}
|
|
/* Indirect mode can't change the PC so just check if the mode is
|
|
autoincrement. */
|
|
else if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
process_autoincrement (cris_get_size (inst), inst, inst_env);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Checks that the PC isn't the destination register or the instructions has
|
|
a prefix. */
|
|
|
|
static void
|
|
dstep_logshift_mstep_neg_not_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to have the PC as the destination. The instruction can't
|
|
have a prefix. */
|
|
if ((cris_get_operand2 (inst) == REG_PC) || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Checks that the instruction doesn't have a prefix. */
|
|
|
|
static void
|
|
break_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* The instruction can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Checks that the PC isn't the destination register and that the instruction
|
|
doesn't have a prefix. */
|
|
|
|
static void
|
|
scc_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to have the PC as the destination. The instruction can't
|
|
have a prefix. */
|
|
if ((cris_get_operand2 (inst) == REG_PC) || inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles the register mode JUMP instruction. */
|
|
|
|
static void
|
|
reg_mode_jump_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* It's invalid to do a JUMP in a delay slot. The mode is register, so
|
|
you can't have a prefix. */
|
|
if ((inst_env->slot_needed) || (inst_env->prefix_found))
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Just change the PC. */
|
|
inst_env->reg[REG_PC] = inst_env->reg[cris_get_operand1 (inst)];
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles the JUMP instruction for all modes except register. */
|
|
|
|
static void
|
|
none_reg_mode_jump_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
unsigned long newpc;
|
|
CORE_ADDR address;
|
|
|
|
/* It's invalid to do a JUMP in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
}
|
|
else
|
|
{
|
|
/* Check if we have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
check_assign (inst, inst_env);
|
|
|
|
/* Get the new value for the PC. */
|
|
newpc =
|
|
read_memory_unsigned_integer ((CORE_ADDR) inst_env->prefix_value,
|
|
4, inst_env->byte_order);
|
|
}
|
|
else
|
|
{
|
|
/* Get the new value for the PC. */
|
|
address = (CORE_ADDR) inst_env->reg[cris_get_operand1 (inst)];
|
|
newpc = read_memory_unsigned_integer (address,
|
|
4, inst_env->byte_order);
|
|
|
|
/* Check if we should increment a register. */
|
|
if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
inst_env->reg[cris_get_operand1 (inst)] += 4;
|
|
}
|
|
}
|
|
inst_env->reg[REG_PC] = newpc;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles moves to special registers (aka P-register) for all modes. */
|
|
|
|
static void
|
|
move_to_preg_op (struct gdbarch *gdbarch, unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
if (inst_env->prefix_found)
|
|
{
|
|
/* The instruction has a prefix that means we are only interested if
|
|
the instruction is in assign mode. */
|
|
if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE)
|
|
{
|
|
/* The prefix handles the problem if we are in a delay slot. */
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
/* Just take care of the assign. */
|
|
check_assign (inst, inst_env);
|
|
}
|
|
}
|
|
}
|
|
else if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
/* The instruction doesn't have a prefix, the only case left that we
|
|
are interested in is the autoincrement mode. */
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
/* If the PC is to be incremented it's invalid to be in a
|
|
delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* The increment depends on the size of the special register. */
|
|
if (cris_register_size (gdbarch, cris_get_operand2 (inst)) == 1)
|
|
{
|
|
process_autoincrement (INST_BYTE_SIZE, inst, inst_env);
|
|
}
|
|
else if (cris_register_size (gdbarch, cris_get_operand2 (inst)) == 2)
|
|
{
|
|
process_autoincrement (INST_WORD_SIZE, inst, inst_env);
|
|
}
|
|
else
|
|
{
|
|
process_autoincrement (INST_DWORD_SIZE, inst, inst_env);
|
|
}
|
|
}
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles moves from special registers (aka P-register) for all modes
|
|
except register. */
|
|
|
|
static void
|
|
none_reg_mode_move_from_preg_op (struct gdbarch *gdbarch, unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
if (inst_env->prefix_found)
|
|
{
|
|
/* The instruction has a prefix that means we are only interested if
|
|
the instruction is in assign mode. */
|
|
if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE)
|
|
{
|
|
/* The prefix handles the problem if we are in a delay slot. */
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
/* Just take care of the assign. */
|
|
check_assign (inst, inst_env);
|
|
}
|
|
}
|
|
}
|
|
/* The instruction doesn't have a prefix, the only case left that we
|
|
are interested in is the autoincrement mode. */
|
|
else if (cris_get_mode (inst) == AUTOINC_MODE)
|
|
{
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
/* If the PC is to be incremented it's invalid to be in a
|
|
delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* The increment depends on the size of the special register. */
|
|
if (cris_register_size (gdbarch, cris_get_operand2 (inst)) == 1)
|
|
{
|
|
process_autoincrement (INST_BYTE_SIZE, inst, inst_env);
|
|
}
|
|
else if (cris_register_size (gdbarch, cris_get_operand2 (inst)) == 2)
|
|
{
|
|
process_autoincrement (INST_WORD_SIZE, inst, inst_env);
|
|
}
|
|
else
|
|
{
|
|
process_autoincrement (INST_DWORD_SIZE, inst, inst_env);
|
|
}
|
|
}
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles moves from special registers (aka P-register) when the mode
|
|
is register. */
|
|
|
|
static void
|
|
reg_mode_move_from_preg_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* Register mode move from special register can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* The destination is the PC, the jump will have a delay slot. */
|
|
inst_env->delay_slot_pc = inst_env->preg[cris_get_operand2 (inst)];
|
|
inst_env->slot_needed = 1;
|
|
inst_env->delay_slot_pc_active = 1;
|
|
}
|
|
else
|
|
{
|
|
/* If the destination isn't PC, there will be no jump. */
|
|
inst_env->slot_needed = 0;
|
|
}
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 1;
|
|
}
|
|
|
|
/* Handles the MOVEM from memory to general register instruction. */
|
|
|
|
static void
|
|
move_mem_to_reg_movem_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
if (inst_env->prefix_found)
|
|
{
|
|
/* The prefix handles the problem if we are in a delay slot. Is the
|
|
MOVEM instruction going to change the PC? */
|
|
if (cris_get_operand2 (inst) >= REG_PC)
|
|
{
|
|
inst_env->reg[REG_PC] =
|
|
read_memory_unsigned_integer (inst_env->prefix_value,
|
|
4, inst_env->byte_order);
|
|
}
|
|
/* The assign value is the value after the increment. Normally, the
|
|
assign value is the value before the increment. */
|
|
if ((cris_get_operand1 (inst) == REG_PC)
|
|
&& (cris_get_mode (inst) == PREFIX_ASSIGN_MODE))
|
|
{
|
|
inst_env->reg[REG_PC] = inst_env->prefix_value;
|
|
inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Is the MOVEM instruction going to change the PC? */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->reg[REG_PC] =
|
|
read_memory_unsigned_integer (inst_env->reg[cris_get_operand1 (inst)],
|
|
4, inst_env->byte_order);
|
|
}
|
|
/* The increment is not depending on the size, instead it's depending
|
|
on the number of registers loaded from memory. */
|
|
if ((cris_get_operand1 (inst) == REG_PC)
|
|
&& (cris_get_mode (inst) == AUTOINC_MODE))
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1);
|
|
}
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the MOVEM to memory from general register instruction. */
|
|
|
|
static void
|
|
move_reg_to_mem_movem_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
if (inst_env->prefix_found)
|
|
{
|
|
/* The assign value is the value after the increment. Normally, the
|
|
assign value is the value before the increment. */
|
|
if ((cris_get_operand1 (inst) == REG_PC)
|
|
&& (cris_get_mode (inst) == PREFIX_ASSIGN_MODE))
|
|
{
|
|
/* The prefix handles the problem if we are in a delay slot. */
|
|
inst_env->reg[REG_PC] = inst_env->prefix_value;
|
|
inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The increment is not depending on the size, instead it's depending
|
|
on the number of registers loaded to memory. */
|
|
if ((cris_get_operand1 (inst) == REG_PC)
|
|
&& (cris_get_mode (inst) == AUTOINC_MODE))
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1);
|
|
}
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the instructions that's not yet implemented, by setting
|
|
inst_env->invalid to true. */
|
|
|
|
static void
|
|
not_implemented_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
inst_env->invalid = 1;
|
|
}
|
|
|
|
/* Handles the XOR instruction. */
|
|
|
|
static void
|
|
xor_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* XOR can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Check if the PC is the target. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
/* It's invalid to change the PC in a delay slot. */
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->reg[REG_PC] ^= inst_env->reg[cris_get_operand1 (inst)];
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the MULS instruction. */
|
|
|
|
static void
|
|
muls_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* MULS/U can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Consider it invalid if the PC is the target. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the MULU instruction. */
|
|
|
|
static void
|
|
mulu_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
/* MULS/U can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Consider it invalid if the PC is the target. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Calculate the result of the instruction for ADD, SUB, CMP AND, OR and MOVE.
|
|
The MOVE instruction is the move from source to register. */
|
|
|
|
static void
|
|
add_sub_cmp_and_or_move_action (unsigned short inst, inst_env_type *inst_env,
|
|
unsigned long source1, unsigned long source2)
|
|
{
|
|
unsigned long pc_mask;
|
|
unsigned long operation_mask;
|
|
|
|
/* Find out how many bits the operation should apply to. */
|
|
if (cris_get_size (inst) == INST_BYTE_SIZE)
|
|
{
|
|
pc_mask = 0xFFFFFF00;
|
|
operation_mask = 0xFF;
|
|
}
|
|
else if (cris_get_size (inst) == INST_WORD_SIZE)
|
|
{
|
|
pc_mask = 0xFFFF0000;
|
|
operation_mask = 0xFFFF;
|
|
}
|
|
else if (cris_get_size (inst) == INST_DWORD_SIZE)
|
|
{
|
|
pc_mask = 0x0;
|
|
operation_mask = 0xFFFFFFFF;
|
|
}
|
|
else
|
|
{
|
|
/* The size is out of range. */
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* The instruction just works on uw_operation_mask bits. */
|
|
source2 &= operation_mask;
|
|
source1 &= operation_mask;
|
|
|
|
/* Now calculate the result. The opcode's 3 first bits separates
|
|
the different actions. */
|
|
switch (cris_get_opcode (inst) & 7)
|
|
{
|
|
case 0: /* add */
|
|
source1 += source2;
|
|
break;
|
|
|
|
case 1: /* move */
|
|
source1 = source2;
|
|
break;
|
|
|
|
case 2: /* subtract */
|
|
source1 -= source2;
|
|
break;
|
|
|
|
case 3: /* compare */
|
|
break;
|
|
|
|
case 4: /* and */
|
|
source1 &= source2;
|
|
break;
|
|
|
|
case 5: /* or */
|
|
source1 |= source2;
|
|
break;
|
|
|
|
default:
|
|
inst_env->invalid = 1;
|
|
return;
|
|
|
|
break;
|
|
}
|
|
|
|
/* Make sure that the result doesn't contain more than the instruction
|
|
size bits. */
|
|
source2 &= operation_mask;
|
|
|
|
/* Calculate the new breakpoint address. */
|
|
inst_env->reg[REG_PC] &= pc_mask;
|
|
inst_env->reg[REG_PC] |= source1;
|
|
|
|
}
|
|
|
|
/* Extends the value from either byte or word size to a dword. If the mode
|
|
is zero extend then the value is extended with zero. If instead the mode
|
|
is signed extend the sign bit of the value is taken into consideration. */
|
|
|
|
static unsigned long
|
|
do_sign_or_zero_extend (unsigned long value, unsigned short *inst)
|
|
{
|
|
/* The size can be either byte or word, check which one it is.
|
|
Don't check the highest bit, it's indicating if it's a zero
|
|
or sign extend. */
|
|
if (cris_get_size (*inst) & INST_WORD_SIZE)
|
|
{
|
|
/* Word size. */
|
|
value &= 0xFFFF;
|
|
|
|
/* Check if the instruction is signed extend. If so, check if value has
|
|
the sign bit on. */
|
|
if (cris_is_signed_extend_bit_on (*inst) && (value & SIGNED_WORD_MASK))
|
|
{
|
|
value |= SIGNED_WORD_EXTEND_MASK;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Byte size. */
|
|
value &= 0xFF;
|
|
|
|
/* Check if the instruction is signed extend. If so, check if value has
|
|
the sign bit on. */
|
|
if (cris_is_signed_extend_bit_on (*inst) && (value & SIGNED_BYTE_MASK))
|
|
{
|
|
value |= SIGNED_BYTE_EXTEND_MASK;
|
|
}
|
|
}
|
|
/* The size should now be dword. */
|
|
cris_set_size_to_dword (inst);
|
|
return value;
|
|
}
|
|
|
|
/* Handles the register mode for the ADD, SUB, CMP, AND, OR and MOVE
|
|
instruction. The MOVE instruction is the move from source to register. */
|
|
|
|
static void
|
|
reg_mode_add_sub_cmp_and_or_move_op (unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
unsigned long operand1;
|
|
unsigned long operand2;
|
|
|
|
/* It's invalid to have a prefix to the instruction. This is a register
|
|
mode instruction and can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* Check if the instruction has PC as its target. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* The instruction has the PC as its target register. */
|
|
operand1 = inst_env->reg[cris_get_operand1 (inst)];
|
|
operand2 = inst_env->reg[REG_PC];
|
|
|
|
/* Check if it's a extend, signed or zero instruction. */
|
|
if (cris_get_opcode (inst) < 4)
|
|
{
|
|
operand1 = do_sign_or_zero_extend (operand1, &inst);
|
|
}
|
|
/* Calculate the PC value after the instruction, i.e. where the
|
|
breakpoint should be. The order of the udw_operands is vital. */
|
|
add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand1);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Returns the data contained at address. The size of the data is derived from
|
|
the size of the operation. If the instruction is a zero or signed
|
|
extend instruction, the size field is changed in instruction. */
|
|
|
|
static unsigned long
|
|
get_data_from_address (unsigned short *inst, CORE_ADDR address,
|
|
enum bfd_endian byte_order)
|
|
{
|
|
int size = cris_get_size (*inst);
|
|
unsigned long value;
|
|
|
|
/* If it's an extend instruction we don't want the signed extend bit,
|
|
because it influences the size. */
|
|
if (cris_get_opcode (*inst) < 4)
|
|
{
|
|
size &= ~SIGNED_EXTEND_BIT_MASK;
|
|
}
|
|
/* Is there a need for checking the size? Size should contain the number of
|
|
bytes to read. */
|
|
size = 1 << size;
|
|
value = read_memory_unsigned_integer (address, size, byte_order);
|
|
|
|
/* Check if it's an extend, signed or zero instruction. */
|
|
if (cris_get_opcode (*inst) < 4)
|
|
{
|
|
value = do_sign_or_zero_extend (value, inst);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
/* Handles the assign addresing mode for the ADD, SUB, CMP, AND, OR and MOVE
|
|
instructions. The MOVE instruction is the move from source to register. */
|
|
|
|
static void
|
|
handle_prefix_assign_mode_for_aritm_op (unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
unsigned long operand2;
|
|
unsigned long operand3;
|
|
|
|
check_assign (inst, inst_env);
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
operand2 = inst_env->reg[REG_PC];
|
|
|
|
/* Get the value of the third operand. */
|
|
operand3 = get_data_from_address (&inst, inst_env->prefix_value,
|
|
inst_env->byte_order);
|
|
|
|
/* Calculate the PC value after the instruction, i.e. where the
|
|
breakpoint should be. The order of the udw_operands is vital. */
|
|
add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand3);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the three-operand addressing mode for the ADD, SUB, CMP, AND and
|
|
OR instructions. Note that for this to work as expected, the calling
|
|
function must have made sure that there is a prefix to this instruction. */
|
|
|
|
static void
|
|
three_operand_add_sub_cmp_and_or_op (unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
unsigned long operand2;
|
|
unsigned long operand3;
|
|
|
|
if (cris_get_operand1 (inst) == REG_PC)
|
|
{
|
|
/* The PC will be changed by the instruction. */
|
|
operand2 = inst_env->reg[cris_get_operand2 (inst)];
|
|
|
|
/* Get the value of the third operand. */
|
|
operand3 = get_data_from_address (&inst, inst_env->prefix_value,
|
|
inst_env->byte_order);
|
|
|
|
/* Calculate the PC value after the instruction, i.e. where the
|
|
breakpoint should be. */
|
|
add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand3);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the index addresing mode for the ADD, SUB, CMP, AND, OR and MOVE
|
|
instructions. The MOVE instruction is the move from source to register. */
|
|
|
|
static void
|
|
handle_prefix_index_mode_for_aritm_op (unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
if (cris_get_operand1 (inst) != cris_get_operand2 (inst))
|
|
{
|
|
/* If the instruction is MOVE it's invalid. If the instruction is ADD,
|
|
SUB, AND or OR something weird is going on (if everything works these
|
|
instructions should end up in the three operand version). */
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
/* three_operand_add_sub_cmp_and_or does the same as we should do here
|
|
so use it. */
|
|
three_operand_add_sub_cmp_and_or_op (inst, inst_env);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the autoincrement and indirect addresing mode for the ADD, SUB,
|
|
CMP, AND OR and MOVE instruction. The MOVE instruction is the move from
|
|
source to register. */
|
|
|
|
static void
|
|
handle_inc_and_index_mode_for_aritm_op (unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
unsigned long operand1;
|
|
unsigned long operand2;
|
|
unsigned long operand3;
|
|
int size;
|
|
|
|
/* The instruction is either an indirect or autoincrement addressing mode.
|
|
Check if the destination register is the PC. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
/* Must be done here, get_data_from_address may change the size
|
|
field. */
|
|
size = cris_get_size (inst);
|
|
operand2 = inst_env->reg[REG_PC];
|
|
|
|
/* Get the value of the third operand, i.e. the indirect operand. */
|
|
operand1 = inst_env->reg[cris_get_operand1 (inst)];
|
|
operand3 = get_data_from_address (&inst, operand1, inst_env->byte_order);
|
|
|
|
/* Calculate the PC value after the instruction, i.e. where the
|
|
breakpoint should be. The order of the udw_operands is vital. */
|
|
add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand3);
|
|
}
|
|
/* If this is an autoincrement addressing mode, check if the increment
|
|
changes the PC. */
|
|
if ((cris_get_operand1 (inst) == REG_PC)
|
|
&& (cris_get_mode (inst) == AUTOINC_MODE))
|
|
{
|
|
/* Get the size field. */
|
|
size = cris_get_size (inst);
|
|
|
|
/* If it's an extend instruction we don't want the signed extend bit,
|
|
because it influences the size. */
|
|
if (cris_get_opcode (inst) < 4)
|
|
{
|
|
size &= ~SIGNED_EXTEND_BIT_MASK;
|
|
}
|
|
process_autoincrement (size, inst, inst_env);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the two-operand addressing mode, all modes except register, for
|
|
the ADD, SUB CMP, AND and OR instruction. */
|
|
|
|
static void
|
|
none_reg_mode_add_sub_cmp_and_or_move_op (unsigned short inst,
|
|
inst_env_type *inst_env)
|
|
{
|
|
if (inst_env->prefix_found)
|
|
{
|
|
if (cris_get_mode (inst) == PREFIX_INDEX_MODE)
|
|
{
|
|
handle_prefix_index_mode_for_aritm_op (inst, inst_env);
|
|
}
|
|
else if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE)
|
|
{
|
|
handle_prefix_assign_mode_for_aritm_op (inst, inst_env);
|
|
}
|
|
else
|
|
{
|
|
/* The mode is invalid for a prefixed base instruction. */
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
handle_inc_and_index_mode_for_aritm_op (inst, inst_env);
|
|
}
|
|
}
|
|
|
|
/* Handles the quick addressing mode for the ADD and SUB instruction. */
|
|
|
|
static void
|
|
quick_mode_add_sub_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
unsigned long operand1;
|
|
unsigned long operand2;
|
|
|
|
/* It's a bad idea to be in a prefix instruction now. This is a quick mode
|
|
instruction and can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
|
|
/* Check if the instruction has PC as its target. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
operand1 = cris_get_quick_value (inst);
|
|
operand2 = inst_env->reg[REG_PC];
|
|
|
|
/* The size should now be dword. */
|
|
cris_set_size_to_dword (&inst);
|
|
|
|
/* Calculate the PC value after the instruction, i.e. where the
|
|
breakpoint should be. */
|
|
add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand1);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Handles the quick addressing mode for the CMP, AND and OR instruction. */
|
|
|
|
static void
|
|
quick_mode_and_cmp_move_or_op (unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
unsigned long operand1;
|
|
unsigned long operand2;
|
|
|
|
/* It's a bad idea to be in a prefix instruction now. This is a quick mode
|
|
instruction and can't have a prefix. */
|
|
if (inst_env->prefix_found)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* Check if the instruction has PC as its target. */
|
|
if (cris_get_operand2 (inst) == REG_PC)
|
|
{
|
|
if (inst_env->slot_needed)
|
|
{
|
|
inst_env->invalid = 1;
|
|
return;
|
|
}
|
|
/* The instruction has the PC as its target register. */
|
|
operand1 = cris_get_quick_value (inst);
|
|
operand2 = inst_env->reg[REG_PC];
|
|
|
|
/* The quick value is signed, so check if we must do a signed extend. */
|
|
if (operand1 & SIGNED_QUICK_VALUE_MASK)
|
|
{
|
|
/* sign extend */
|
|
operand1 |= SIGNED_QUICK_VALUE_EXTEND_MASK;
|
|
}
|
|
/* The size should now be dword. */
|
|
cris_set_size_to_dword (&inst);
|
|
|
|
/* Calculate the PC value after the instruction, i.e. where the
|
|
breakpoint should be. */
|
|
add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand1);
|
|
}
|
|
inst_env->slot_needed = 0;
|
|
inst_env->prefix_found = 0;
|
|
inst_env->xflag_found = 0;
|
|
inst_env->disable_interrupt = 0;
|
|
}
|
|
|
|
/* Translate op_type to a function and call it. */
|
|
|
|
static void
|
|
cris_gdb_func (struct gdbarch *gdbarch, enum cris_op_type op_type,
|
|
unsigned short inst, inst_env_type *inst_env)
|
|
{
|
|
switch (op_type)
|
|
{
|
|
case cris_not_implemented_op:
|
|
not_implemented_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_abs_op:
|
|
abs_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_addi_op:
|
|
addi_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_asr_op:
|
|
asr_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_asrq_op:
|
|
asrq_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_ax_ei_setf_op:
|
|
ax_ei_setf_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_bdap_prefix:
|
|
bdap_prefix (inst, inst_env);
|
|
break;
|
|
|
|
case cris_biap_prefix:
|
|
biap_prefix (inst, inst_env);
|
|
break;
|
|
|
|
case cris_break_op:
|
|
break_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_btst_nop_op:
|
|
btst_nop_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_clearf_di_op:
|
|
clearf_di_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_dip_prefix:
|
|
dip_prefix (inst, inst_env);
|
|
break;
|
|
|
|
case cris_dstep_logshift_mstep_neg_not_op:
|
|
dstep_logshift_mstep_neg_not_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_eight_bit_offset_branch_op:
|
|
eight_bit_offset_branch_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_move_mem_to_reg_movem_op:
|
|
move_mem_to_reg_movem_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_move_reg_to_mem_movem_op:
|
|
move_reg_to_mem_movem_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_move_to_preg_op:
|
|
move_to_preg_op (gdbarch, inst, inst_env);
|
|
break;
|
|
|
|
case cris_muls_op:
|
|
muls_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_mulu_op:
|
|
mulu_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_none_reg_mode_add_sub_cmp_and_or_move_op:
|
|
none_reg_mode_add_sub_cmp_and_or_move_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_none_reg_mode_clear_test_op:
|
|
none_reg_mode_clear_test_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_none_reg_mode_jump_op:
|
|
none_reg_mode_jump_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_none_reg_mode_move_from_preg_op:
|
|
none_reg_mode_move_from_preg_op (gdbarch, inst, inst_env);
|
|
break;
|
|
|
|
case cris_quick_mode_add_sub_op:
|
|
quick_mode_add_sub_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_quick_mode_and_cmp_move_or_op:
|
|
quick_mode_and_cmp_move_or_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_quick_mode_bdap_prefix:
|
|
quick_mode_bdap_prefix (inst, inst_env);
|
|
break;
|
|
|
|
case cris_reg_mode_add_sub_cmp_and_or_move_op:
|
|
reg_mode_add_sub_cmp_and_or_move_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_reg_mode_clear_op:
|
|
reg_mode_clear_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_reg_mode_jump_op:
|
|
reg_mode_jump_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_reg_mode_move_from_preg_op:
|
|
reg_mode_move_from_preg_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_reg_mode_test_op:
|
|
reg_mode_test_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_scc_op:
|
|
scc_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_sixteen_bit_offset_branch_op:
|
|
sixteen_bit_offset_branch_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_three_operand_add_sub_cmp_and_or_op:
|
|
three_operand_add_sub_cmp_and_or_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_three_operand_bound_op:
|
|
three_operand_bound_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_two_operand_bound_op:
|
|
two_operand_bound_op (inst, inst_env);
|
|
break;
|
|
|
|
case cris_xor_op:
|
|
xor_op (inst, inst_env);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Originally from <asm/elf.h>. */
|
|
typedef unsigned char cris_elf_greg_t[4];
|
|
|
|
/* Same as user_regs_struct struct in <asm/user.h>. */
|
|
#define CRISV10_ELF_NGREG 35
|
|
typedef cris_elf_greg_t cris_elf_gregset_t[CRISV10_ELF_NGREG];
|
|
|
|
#define CRISV32_ELF_NGREG 32
|
|
typedef cris_elf_greg_t crisv32_elf_gregset_t[CRISV32_ELF_NGREG];
|
|
|
|
/* Unpack a cris_elf_gregset_t into GDB's register cache. */
|
|
|
|
static void
|
|
cris_supply_gregset (const struct regset *regset, struct regcache *regcache,
|
|
int regnum, const void *gregs, size_t len)
|
|
{
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
|
|
int i;
|
|
const cris_elf_greg_t *regp = static_cast<const cris_elf_greg_t *>(gregs);
|
|
|
|
if (len != sizeof (cris_elf_gregset_t)
|
|
&& len != sizeof (crisv32_elf_gregset_t))
|
|
warning (_("wrong size gregset struct in core file"));
|
|
gdb_assert (len >= sizeof (crisv32_elf_gregset_t));
|
|
|
|
/* The kernel dumps all 32 registers as unsigned longs, but supply_register
|
|
knows about the actual size of each register so that's no problem. */
|
|
for (i = 0; i < NUM_GENREGS + NUM_SPECREGS; i++)
|
|
{
|
|
if (regnum == -1 || regnum == i)
|
|
regcache->raw_supply (i, (char *)®p[i]);
|
|
}
|
|
|
|
if (tdep->cris_version == 32 && (regnum == -1 || regnum == ERP_REGNUM))
|
|
{
|
|
/* Needed to set pseudo-register PC for CRISv32. */
|
|
/* FIXME: If ERP is in a delay slot at this point then the PC will
|
|
be wrong. Issue a warning to alert the user. */
|
|
regcache->raw_supply (gdbarch_pc_regnum (gdbarch),
|
|
(char *)®p[ERP_REGNUM]);
|
|
|
|
if (*(char *)®p[ERP_REGNUM] & 0x1)
|
|
gdb_printf (gdb_stderr, "Warning: PC in delay slot\n");
|
|
}
|
|
}
|
|
|
|
static const struct regset cris_regset = {
|
|
nullptr,
|
|
cris_supply_gregset,
|
|
/* We don't need a collect function because we only use this for core files
|
|
(via iterate_over_regset_sections). */
|
|
nullptr,
|
|
REGSET_VARIABLE_SIZE
|
|
};
|
|
|
|
static void cris_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
|
iterate_over_regset_sections_cb *cb,
|
|
void *cb_data,
|
|
const struct regcache *regcache)
|
|
{
|
|
cb (".reg", sizeof (crisv32_elf_gregset_t), sizeof (crisv32_elf_gregset_t),
|
|
&cris_regset, NULL, cb_data);
|
|
}
|
|
|
|
void _initialize_cris_tdep ();
|
|
void
|
|
_initialize_cris_tdep ()
|
|
{
|
|
gdbarch_register (bfd_arch_cris, cris_gdbarch_init, cris_dump_tdep);
|
|
|
|
/* CRIS-specific user-commands. */
|
|
add_setshow_zuinteger_cmd ("cris-version", class_support,
|
|
&usr_cmd_cris_version,
|
|
_("Set the current CRIS version."),
|
|
_("Show the current CRIS version."),
|
|
_("\
|
|
Set to 10 for CRISv10 or 32 for CRISv32 if autodetection fails.\n\
|
|
Defaults to 10. "),
|
|
set_cris_version,
|
|
NULL, /* FIXME: i18n: Current CRIS version
|
|
is %s. */
|
|
&setlist, &showlist);
|
|
|
|
add_setshow_enum_cmd ("cris-mode", class_support,
|
|
cris_modes, &usr_cmd_cris_mode,
|
|
_("Set the current CRIS mode."),
|
|
_("Show the current CRIS mode."),
|
|
_("\
|
|
Set to CRIS_MODE_GURU when debugging in guru mode.\n\
|
|
Makes GDB use the NRP register instead of the ERP register in certain cases."),
|
|
set_cris_mode,
|
|
NULL, /* FIXME: i18n: Current CRIS version is %s. */
|
|
&setlist, &showlist);
|
|
|
|
add_setshow_boolean_cmd ("cris-dwarf2-cfi", class_support,
|
|
&usr_cmd_cris_dwarf2_cfi,
|
|
_("Set the usage of Dwarf-2 CFI for CRIS."),
|
|
_("Show the usage of Dwarf-2 CFI for CRIS."),
|
|
_("Set this to \"off\" if using gcc-cris < R59."),
|
|
set_cris_dwarf2_cfi,
|
|
NULL, /* FIXME: i18n: Usage of Dwarf-2 CFI
|
|
for CRIS is %d. */
|
|
&setlist, &showlist);
|
|
}
|
|
|
|
/* Prints out all target specific values. */
|
|
|
|
static void
|
|
cris_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
|
|
{
|
|
cris_gdbarch_tdep *tdep = gdbarch_tdep<cris_gdbarch_tdep> (gdbarch);
|
|
if (tdep != NULL)
|
|
{
|
|
gdb_printf (file, "cris_dump_tdep: tdep->cris_version = %i\n",
|
|
tdep->cris_version);
|
|
gdb_printf (file, "cris_dump_tdep: tdep->cris_mode = %s\n",
|
|
tdep->cris_mode);
|
|
gdb_printf (file, "cris_dump_tdep: tdep->cris_dwarf2_cfi = %i\n",
|
|
tdep->cris_dwarf2_cfi);
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_cris_version (const char *ignore_args, int from_tty,
|
|
struct cmd_list_element *c)
|
|
{
|
|
struct gdbarch_info info;
|
|
|
|
usr_cmd_cris_version_valid = 1;
|
|
|
|
/* Update the current architecture, if needed. */
|
|
if (!gdbarch_update_p (info))
|
|
internal_error (_("cris_gdbarch_update: failed to update architecture."));
|
|
}
|
|
|
|
static void
|
|
set_cris_mode (const char *ignore_args, int from_tty,
|
|
struct cmd_list_element *c)
|
|
{
|
|
struct gdbarch_info info;
|
|
|
|
/* Update the current architecture, if needed. */
|
|
if (!gdbarch_update_p (info))
|
|
internal_error ("cris_gdbarch_update: failed to update architecture.");
|
|
}
|
|
|
|
static void
|
|
set_cris_dwarf2_cfi (const char *ignore_args, int from_tty,
|
|
struct cmd_list_element *c)
|
|
{
|
|
struct gdbarch_info info;
|
|
|
|
/* Update the current architecture, if needed. */
|
|
if (!gdbarch_update_p (info))
|
|
internal_error (_("cris_gdbarch_update: failed to update architecture."));
|
|
}
|
|
|
|
static struct gdbarch *
|
|
cris_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
|
|
{
|
|
struct gdbarch *gdbarch;
|
|
unsigned int cris_version;
|
|
|
|
if (usr_cmd_cris_version_valid)
|
|
{
|
|
/* Trust the user's CRIS version setting. */
|
|
cris_version = usr_cmd_cris_version;
|
|
}
|
|
else if (info.abfd && bfd_get_mach (info.abfd) == bfd_mach_cris_v32)
|
|
{
|
|
cris_version = 32;
|
|
}
|
|
else
|
|
{
|
|
/* Assume it's CRIS version 10. */
|
|
cris_version = 10;
|
|
}
|
|
|
|
/* Make the current settings visible to the user. */
|
|
usr_cmd_cris_version = cris_version;
|
|
|
|
/* Find a candidate among the list of pre-declared architectures. */
|
|
for (arches = gdbarch_list_lookup_by_info (arches, &info);
|
|
arches != NULL;
|
|
arches = gdbarch_list_lookup_by_info (arches->next, &info))
|
|
{
|
|
cris_gdbarch_tdep *tdep
|
|
= gdbarch_tdep<cris_gdbarch_tdep> (arches->gdbarch);
|
|
|
|
if (tdep->cris_version == usr_cmd_cris_version
|
|
&& tdep->cris_mode == usr_cmd_cris_mode
|
|
&& tdep->cris_dwarf2_cfi == usr_cmd_cris_dwarf2_cfi)
|
|
return arches->gdbarch;
|
|
}
|
|
|
|
/* No matching architecture was found. Create a new one. */
|
|
cris_gdbarch_tdep *tdep = new cris_gdbarch_tdep;
|
|
info.byte_order = BFD_ENDIAN_LITTLE;
|
|
gdbarch = gdbarch_alloc (&info, tdep);
|
|
|
|
tdep->cris_version = usr_cmd_cris_version;
|
|
tdep->cris_mode = usr_cmd_cris_mode;
|
|
tdep->cris_dwarf2_cfi = usr_cmd_cris_dwarf2_cfi;
|
|
|
|
set_gdbarch_return_value (gdbarch, cris_return_value);
|
|
set_gdbarch_sp_regnum (gdbarch, 14);
|
|
|
|
/* Length of ordinary registers used in push_word and a few other
|
|
places. register_size() is the real way to know how big a
|
|
register is. */
|
|
|
|
set_gdbarch_double_bit (gdbarch, 64);
|
|
/* The default definition of a long double is 2 * gdbarch_double_bit,
|
|
which means we have to set this explicitly. */
|
|
set_gdbarch_long_double_bit (gdbarch, 64);
|
|
|
|
/* The total amount of space needed to store (in an array called registers)
|
|
GDB's copy of the machine's register state. Note: We can not use
|
|
cris_register_size at this point, since it relies on gdbarch
|
|
being set. */
|
|
switch (tdep->cris_version)
|
|
{
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
case 8:
|
|
case 9:
|
|
/* Old versions; not supported. */
|
|
return 0;
|
|
|
|
case 10:
|
|
case 11:
|
|
/* CRIS v10 and v11, a.k.a. ETRAX 100LX. In addition to ETRAX 100,
|
|
P7 (32 bits), and P15 (32 bits) have been implemented. */
|
|
set_gdbarch_pc_regnum (gdbarch, 15);
|
|
set_gdbarch_register_type (gdbarch, cris_register_type);
|
|
/* There are 32 registers (some of which may not be implemented). */
|
|
set_gdbarch_num_regs (gdbarch, 32);
|
|
set_gdbarch_register_name (gdbarch, cris_register_name);
|
|
set_gdbarch_cannot_store_register (gdbarch, cris_cannot_store_register);
|
|
set_gdbarch_cannot_fetch_register (gdbarch, cris_cannot_fetch_register);
|
|
|
|
set_gdbarch_software_single_step (gdbarch, cris_software_single_step);
|
|
break;
|
|
|
|
case 32:
|
|
/* CRIS v32. General registers R0 - R15 (32 bits), special registers
|
|
P0 - P15 (32 bits) except P0, P1, P3 (8 bits) and P4 (16 bits)
|
|
and pseudo-register PC (32 bits). */
|
|
set_gdbarch_pc_regnum (gdbarch, 32);
|
|
set_gdbarch_register_type (gdbarch, crisv32_register_type);
|
|
/* 32 registers + pseudo-register PC + 16 support registers. */
|
|
set_gdbarch_num_regs (gdbarch, 32 + 1 + 16);
|
|
set_gdbarch_register_name (gdbarch, crisv32_register_name);
|
|
|
|
set_gdbarch_cannot_store_register
|
|
(gdbarch, crisv32_cannot_store_register);
|
|
set_gdbarch_cannot_fetch_register
|
|
(gdbarch, crisv32_cannot_fetch_register);
|
|
|
|
set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1);
|
|
|
|
set_gdbarch_single_step_through_delay
|
|
(gdbarch, crisv32_single_step_through_delay);
|
|
|
|
break;
|
|
|
|
default:
|
|
/* Unknown version. */
|
|
return 0;
|
|
}
|
|
|
|
/* Dummy frame functions (shared between CRISv10 and CRISv32 since they
|
|
have the same ABI). */
|
|
set_gdbarch_push_dummy_code (gdbarch, cris_push_dummy_code);
|
|
set_gdbarch_push_dummy_call (gdbarch, cris_push_dummy_call);
|
|
set_gdbarch_frame_align (gdbarch, cris_frame_align);
|
|
set_gdbarch_skip_prologue (gdbarch, cris_skip_prologue);
|
|
|
|
/* The stack grows downward. */
|
|
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
|
|
|
|
set_gdbarch_breakpoint_kind_from_pc (gdbarch, cris_breakpoint_kind_from_pc);
|
|
set_gdbarch_sw_breakpoint_from_kind (gdbarch, cris_sw_breakpoint_from_kind);
|
|
set_gdbarch_iterate_over_regset_sections (gdbarch, cris_iterate_over_regset_sections);
|
|
|
|
if (tdep->cris_dwarf2_cfi == 1)
|
|
{
|
|
/* Hook in the Dwarf-2 frame sniffer. */
|
|
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, cris_dwarf2_reg_to_regnum);
|
|
dwarf2_frame_set_init_reg (gdbarch, cris_dwarf2_frame_init_reg);
|
|
dwarf2_append_unwinders (gdbarch);
|
|
}
|
|
|
|
if (tdep->cris_mode != cris_mode_guru)
|
|
{
|
|
frame_unwind_append_unwinder (gdbarch, &cris_sigtramp_frame_unwind);
|
|
}
|
|
|
|
frame_unwind_append_unwinder (gdbarch, &cris_frame_unwind);
|
|
frame_base_set_default (gdbarch, &cris_frame_base);
|
|
|
|
/* Hook in ABI-specific overrides, if they have been registered. */
|
|
gdbarch_init_osabi (info, gdbarch);
|
|
|
|
return gdbarch;
|
|
}
|