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6d8eadbddc
* mips-irix-tdep.c: #include mips-tdep.h, trad-frame.h, and
tramp-frame.h.
(SIGTRAMP_FRAME_SIZE, SIGCONTEXT_PC_OFF, SIGCONTEXT_REGS_OFF)
(SIGCONTEXT_FPREGS_OFF, SIGCONTEXT_FPCSR_OFF, SIGCONTEXT_HI_OFF)
(SIGCONTEXT_LO_OFF): New macros.
(mips_irix_n32_tramp_frame_init): New function.
(mips_irix_n32_tramp_frame): New static constant.
(mips_irix_init_abi): Prepend the mips_irix_n32_tramp_frame unwinder.
252 lines
9.8 KiB
C
252 lines
9.8 KiB
C
/* Target-dependent code for the MIPS architecture running on IRIX,
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for GDB, the GNU Debugger.
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Copyright (C) 2002, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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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 "osabi.h"
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#include "gdb_string.h"
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#include "solib.h"
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#include "solib-irix.h"
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#include "elf-bfd.h"
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#include "mips-tdep.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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static void
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mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
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void *obj)
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{
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enum gdb_osabi *os_ident_ptr = obj;
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const char *name;
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unsigned int sectsize;
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name = bfd_get_section_name (abfd, sect);
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sectsize = bfd_section_size (abfd, sect);
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if (strncmp (name, ".MIPS.", 6) == 0 && sectsize > 0)
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{
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/* The presence of a section named with a ".MIPS." prefix is
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indicative of an IRIX binary. */
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*os_ident_ptr = GDB_OSABI_IRIX;
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}
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}
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static enum gdb_osabi
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mips_irix_elf_osabi_sniffer (bfd *abfd)
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{
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unsigned int elfosabi;
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enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
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/* If the generic sniffer gets a hit, return and let other sniffers
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get a crack at it. */
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bfd_map_over_sections (abfd,
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generic_elf_osabi_sniff_abi_tag_sections,
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&osabi);
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if (osabi != GDB_OSABI_UNKNOWN)
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return GDB_OSABI_UNKNOWN;
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elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
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if (elfosabi == ELFOSABI_NONE)
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{
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/* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
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file are conforming to the base specification for that machine
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(there are no OS-specific extensions). In order to determine the
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real OS in use we must look for OS notes that have been added.
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For IRIX, we simply look for sections named with .MIPS. as
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prefixes. */
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bfd_map_over_sections (abfd,
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mips_irix_elf_osabi_sniff_abi_tag_sections,
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&osabi);
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}
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return osabi;
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}
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/* Unwinding past the signal handler on mips-irix.
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Note: The following has only been tested with N32, but can probably
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be made to work with a small number of adjustments.
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On mips-irix, the sigcontext_t structure is stored at the base
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of the frame established by the _sigtramp function. The definition
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of this structure can be found in <sys/signal.h> (comments have been
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C++'ified to avoid a collision with the C-style comment delimiters
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used by this comment):
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typedef struct sigcontext {
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__uint32_t sc_regmask; // regs to restore in sigcleanup
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__uint32_t sc_status; // cp0 status register
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__uint64_t sc_pc; // pc at time of signal
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// General purpose registers
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__uint64_t sc_regs[32]; // processor regs 0 to 31
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// Floating point coprocessor state
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__uint64_t sc_fpregs[32]; // fp regs 0 to 31
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__uint32_t sc_ownedfp; // fp has been used
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__uint32_t sc_fpc_csr; // fpu control and status reg
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__uint32_t sc_fpc_eir; // fpu exception instruction reg
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// implementation/revision
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__uint32_t sc_ssflags; // signal stack state to restore
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__uint64_t sc_mdhi; // Multiplier hi and low regs
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__uint64_t sc_mdlo;
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// System coprocessor registers at time of signal
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__uint64_t sc_cause; // cp0 cause register
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__uint64_t sc_badvaddr; // cp0 bad virtual address
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__uint64_t sc_triggersave; // state of graphics trigger (SGI)
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sigset_t sc_sigset; // signal mask to restore
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__uint64_t sc_fp_rounded_result; // for Ieee 754 support
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__uint64_t sc_pad[31];
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} sigcontext_t;
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The following macros provide the offset of some of the fields
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used to retrieve the value of the registers before the signal
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was raised. */
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/* The size of the sigtramp frame. The sigtramp frame base can then
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be computed by adding this size to the SP. */
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#define SIGTRAMP_FRAME_SIZE 48
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/* The offset in sigcontext_t where the PC is saved. */
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#define SIGCONTEXT_PC_OFF 8
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/* The offset in sigcontext_t where the GP registers are saved. */
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#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
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/* The offset in sigcontext_t where the FP regsiters are saved. */
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#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
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/* The offset in sigcontext_t where the FP CSR register is saved. */
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#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
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/* The offset in sigcontext_t where the multiplier hi register is saved. */
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#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
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/* The offset in sigcontext_t where the multiplier lo register is saved. */
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#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)
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/* Implement the "init" routine in struct tramp_frame for the N32 ABI
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on mips-irix. */
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static void
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mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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const int num_regs = gdbarch_num_regs (gdbarch);
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int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
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const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
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const CORE_ADDR sigcontext_base = sp + 48;
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const struct mips_regnum *regs = mips_regnum (gdbarch);
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int ireg;
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trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
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sigcontext_base + SIGCONTEXT_PC_OFF);
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for (ireg = 1; ireg < 32; ireg++)
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trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
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sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);
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for (ireg = 0; ireg < 32; ireg++)
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trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
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sigcontext_base + SIGCONTEXT_FPREGS_OFF
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+ ireg * 8);
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trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
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sigcontext_base + SIGCONTEXT_FPCSR_OFF);
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trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
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sigcontext_base + SIGCONTEXT_HI_OFF);
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trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
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sigcontext_base + SIGCONTEXT_LO_OFF);
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trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
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}
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/* The tramp_frame structure describing sigtramp frames on mips-irix N32.
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Note that the list of instructions below is pretty much a pure dump
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of function _sigtramp on mips-irix. A few instructions are actually
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not tested (mask set to 0), because a portion of these instructions
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contain an address which changes due to relocation. We could use
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a smarter mask that checks the instrutction code alone, but given
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the number of instructions already being checked, this seemed
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unnecessary. */
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static const struct tramp_frame mips_irix_n32_tramp_frame =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0x3c0c8000, -1 }, /* lui t0,0x8000 */
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{ 0x27bdffd0, -1 }, /* addiu sp,sp,-48 */
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{ 0x008c6024, -1 }, /* and t0,a0,t0 */
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{ 0xffa40018, -1 }, /* sd a0,24(sp) */
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{ 0x00000000, 0 }, /* beqz t0,0xfaefcb8 <_sigtramp+40> */
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{ 0xffa60028, -1 }, /* sd a2,40(sp) */
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{ 0x01806027, -1 }, /* nor t0,t0,zero */
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{ 0xffa00020, -1 }, /* sd zero,32(sp) */
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{ 0x00000000, 0 }, /* b 0xfaefcbc <_sigtramp+44> */
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{ 0x008c2024, -1 }, /* and a0,a0,t0 */
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{ 0xffa60020, -1 }, /* sd a2,32(sp) */
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{ 0x03e0c025, -1 }, /* move t8,ra */
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{ 0x00000000, 0 }, /* bal 0xfaefcc8 <_sigtramp+56> */
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{ 0x00000000, -1 }, /* nop */
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{ 0x3c0c0007, -1 }, /* lui t0,0x7 */
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{ 0x00e0c825, -1 }, /* move t9,a3 */
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{ 0x658c80fc, -1 }, /* daddiu t0,t0,-32516 */
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{ 0x019f602d, -1 }, /* daddu t0,t0,ra */
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{ 0x0300f825, -1 }, /* move ra,t8 */
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{ 0x8d8c9880, -1 }, /* lw t0,-26496(t0) */
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{ 0x8d8c0000, -1 }, /* lw t0,0(t0) */
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{ 0x8d8d0000, -1 }, /* lw t1,0(t0) */
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{ 0xffac0008, -1 }, /* sd t0,8(sp) */
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{ 0x0320f809, -1 }, /* jalr t9 */
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{ 0xffad0010, -1 }, /* sd t1,16(sp) */
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{ 0xdfad0010, -1 }, /* ld t1,16(sp) */
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{ 0xdfac0008, -1 }, /* ld t0,8(sp) */
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{ 0xad8d0000, -1 }, /* sw t1,0(t0) */
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{ 0xdfa40020, -1 }, /* ld a0,32(sp) */
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{ 0xdfa50028, -1 }, /* ld a1,40(sp) */
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{ 0xdfa60018, -1 }, /* ld a2,24(sp) */
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{ 0x24020440, -1 }, /* li v0,1088 */
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{ 0x0000000c, -1 }, /* syscall */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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mips_irix_n32_tramp_frame_init
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};
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static void
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mips_irix_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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set_solib_ops (gdbarch, &irix_so_ops);
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tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_mips_irix_tdep;
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void
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_initialize_mips_irix_tdep (void)
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{
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/* Register an ELF OS ABI sniffer for IRIX binaries. */
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gdbarch_register_osabi_sniffer (bfd_arch_mips,
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bfd_target_elf_flavour,
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mips_irix_elf_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX,
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mips_irix_init_abi);
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}
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