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327 lines
8.5 KiB
C
327 lines
8.5 KiB
C
/* Low level interface to ptrace, for the remote server for GDB.
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Copyright (C) 1995-2017 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 "server.h"
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#include "linux-low.h"
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#include "nat/gdb_ptrace.h"
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#include "gdb_proc_service.h"
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/* The stack pointer is offset from the stack frame by a BIAS of 2047
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(0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
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hosts, so undefine it first. */
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#undef BIAS
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#define BIAS 2047
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#define INSN_SIZE 4
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#define SPARC_R_REGS_NUM 32
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#define SPARC_F_REGS_NUM 48
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#define SPARC_CONTROL_REGS_NUM 6
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#define sparc_num_regs \
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(SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
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/* Each offset is multiplied by 8, because of the register size.
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These offsets apply to the buffer sent/filled by ptrace.
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Additionally, the array elements order corresponds to the .dat file, and the
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gdb's registers enumeration order. */
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static int sparc_regmap[] = {
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/* These offsets correspond to GET/SETREGSET. */
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-1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */
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7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */
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/* Floating point registers offsets correspond to GET/SETFPREGSET. */
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0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */
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8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */
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16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */
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24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */
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/* F32 offset starts next to f31: 31*4+4 = 16 * 8. */
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16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */
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24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */
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17 *8, /* pc */
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18 *8, /* npc */
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16 *8, /* state */
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/* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
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next to f62. */
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32 *8, /* fsr */
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-1, /* fprs */
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/* Y register is 32-bits length, but gdb takes care of that. */
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19 *8, /* y */
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};
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struct regs_range_t
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{
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int regno_start;
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int regno_end;
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};
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static const struct regs_range_t gregs_ranges[] = {
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{ 0, 31 }, /* g0 .. i7 */
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{ 80, 82 }, /* pc .. state */
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{ 84, 85 } /* fprs .. y */
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};
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#define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
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static const struct regs_range_t fpregs_ranges[] = {
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{ 32, 79 }, /* f0 .. f62 */
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{ 83, 83 } /* fsr */
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};
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#define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
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/* Defined in auto-generated file reg-sparc64.c. */
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void init_registers_sparc64 (void);
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extern const struct target_desc *tdesc_sparc64;
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static int
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sparc_cannot_store_register (int regno)
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{
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return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
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}
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static int
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sparc_cannot_fetch_register (int regno)
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{
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return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
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}
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static void
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sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf)
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{
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int i;
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CORE_ADDR addr = 0;
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unsigned char tmp_reg_buf[8];
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const int l0_regno = find_regno (regcache->tdesc, "l0");
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const int i7_regno = l0_regno + 15;
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/* These registers have to be stored in the stack. */
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memcpy (&addr,
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((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
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sizeof (addr));
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addr += BIAS;
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for (i = l0_regno; i <= i7_regno; i++)
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{
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collect_register (regcache, i, tmp_reg_buf);
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(*the_target->write_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
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addr += sizeof (tmp_reg_buf);
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}
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}
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static void
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sparc_fill_gregset (struct regcache *regcache, void *buf)
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{
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int i;
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int range;
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for (range = 0; range < N_GREGS_RANGES; range++)
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for (i = gregs_ranges[range].regno_start;
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i <= gregs_ranges[range].regno_end; i++)
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if (sparc_regmap[i] != -1)
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collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
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sparc_fill_gregset_to_stack (regcache, buf);
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}
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static void
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sparc_fill_fpregset (struct regcache *regcache, void *buf)
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{
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int i;
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int range;
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for (range = 0; range < N_FPREGS_RANGES; range++)
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for (i = fpregs_ranges[range].regno_start;
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i <= fpregs_ranges[range].regno_end; i++)
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collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
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}
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static void
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sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)
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{
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int i;
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CORE_ADDR addr = 0;
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unsigned char tmp_reg_buf[8];
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const int l0_regno = find_regno (regcache->tdesc, "l0");
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const int i7_regno = l0_regno + 15;
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/* These registers have to be obtained from the stack. */
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memcpy (&addr,
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((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
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sizeof (addr));
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addr += BIAS;
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for (i = l0_regno; i <= i7_regno; i++)
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{
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(*the_target->read_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
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supply_register (regcache, i, tmp_reg_buf);
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addr += sizeof (tmp_reg_buf);
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}
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}
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static void
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sparc_store_gregset (struct regcache *regcache, const void *buf)
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{
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int i;
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char zerobuf[8];
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int range;
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memset (zerobuf, 0, sizeof (zerobuf));
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for (range = 0; range < N_GREGS_RANGES; range++)
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for (i = gregs_ranges[range].regno_start;
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i <= gregs_ranges[range].regno_end; i++)
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if (sparc_regmap[i] != -1)
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supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
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else
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supply_register (regcache, i, zerobuf);
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sparc_store_gregset_from_stack (regcache, buf);
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}
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static void
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sparc_store_fpregset (struct regcache *regcache, const void *buf)
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{
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int i;
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int range;
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for (range = 0; range < N_FPREGS_RANGES; range++)
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for (i = fpregs_ranges[range].regno_start;
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i <= fpregs_ranges[range].regno_end;
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i++)
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supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
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}
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static const gdb_byte sparc_breakpoint[INSN_SIZE] = {
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0x91, 0xd0, 0x20, 0x01
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};
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#define sparc_breakpoint_len INSN_SIZE
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/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
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static const unsigned char *
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sparc_sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = sparc_breakpoint_len;
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return sparc_breakpoint;
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}
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static int
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sparc_breakpoint_at (CORE_ADDR where)
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{
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unsigned char insn[INSN_SIZE];
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(*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn));
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if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)
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return 1;
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/* If necessary, recognize more trap instructions here. GDB only
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uses TRAP Always. */
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return 0;
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}
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static void
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sparc_arch_setup (void)
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{
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current_process ()->tdesc = tdesc_sparc64;
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}
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static struct regset_info sparc_regsets[] = {
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{ PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
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GENERAL_REGS,
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sparc_fill_gregset, sparc_store_gregset },
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{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
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FP_REGS,
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sparc_fill_fpregset, sparc_store_fpregset },
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NULL_REGSET
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};
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static struct regsets_info sparc_regsets_info =
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{
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sparc_regsets, /* regsets */
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0, /* num_regsets */
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NULL, /* disabled_regsets */
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};
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static struct usrregs_info sparc_usrregs_info =
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{
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sparc_num_regs,
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/* No regmap needs to be provided since this impl. doesn't use
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USRREGS. */
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NULL
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};
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static struct regs_info regs_info =
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{
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NULL, /* regset_bitmap */
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&sparc_usrregs_info,
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&sparc_regsets_info
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};
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static const struct regs_info *
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sparc_regs_info (void)
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{
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return ®s_info;
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}
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struct linux_target_ops the_low_target = {
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sparc_arch_setup,
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sparc_regs_info,
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sparc_cannot_fetch_register,
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sparc_cannot_store_register,
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NULL, /* fetch_register */
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linux_get_pc_64bit,
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/* No sparc_set_pc is needed. */
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NULL,
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NULL, /* breakpoint_kind_from_pc */
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sparc_sw_breakpoint_from_kind,
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NULL, /* get_next_pcs */
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0,
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sparc_breakpoint_at,
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NULL, /* supports_z_point_type */
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NULL, NULL, NULL, NULL,
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NULL, NULL
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};
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void
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initialize_low_arch (void)
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{
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/* Initialize the Linux target descriptions. */
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init_registers_sparc64 ();
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initialize_regsets_info (&sparc_regsets_info);
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}
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