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jeremybenn |
/* Target-dependent code for FreeBSD/i386.
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Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
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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 "arch-utils.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "bsd-uthread.h"
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#include "solib-svr4.h"
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/* FreeBSD 3.0-RELEASE or later. */
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/* From <machine/reg.h>. */
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static int i386fbsd_r_reg_offset[] =
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{
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9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */
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15 * 4, 4 * 4, /* %esp, %ebp */
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3 * 4, 2 * 4, /* %esi, %edi */
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12 * 4, 14 * 4, /* %eip, %eflags */
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13 * 4, 16 * 4, /* %cs, %ss */
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1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */
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};
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/* Sigtramp routine location. */
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CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
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CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
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/* From <machine/signal.h>. */
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int i386fbsd_sc_reg_offset[] =
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{
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8 + 14 * 4, /* %eax */
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8 + 13 * 4, /* %ecx */
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8 + 12 * 4, /* %edx */
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8 + 11 * 4, /* %ebx */
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8 + 0 * 4, /* %esp */
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8 + 1 * 4, /* %ebp */
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8 + 10 * 4, /* %esi */
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8 + 9 * 4, /* %edi */
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8 + 3 * 4, /* %eip */
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8 + 4 * 4, /* %eflags */
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8 + 7 * 4, /* %cs */
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8 + 8 * 4, /* %ss */
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8 + 6 * 4, /* %ds */
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8 + 5 * 4, /* %es */
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8 + 15 * 4, /* %fs */
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8 + 16 * 4 /* %gs */
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};
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/* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
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static int i386fbsd_jmp_buf_reg_offset[] =
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{
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-1, /* %eax */
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-1, /* %ecx */
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-1, /* %edx */
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1 * 4, /* %ebx */
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2 * 4, /* %esp */
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3 * 4, /* %ebp */
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4 * 4, /* %esi */
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5 * 4, /* %edi */
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};
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static void
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i386fbsd_supply_uthread (struct regcache *regcache,
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int regnum, CORE_ADDR addr)
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{
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char buf[4];
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int i;
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gdb_assert (regnum >= -1);
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for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
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{
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if (i386fbsd_jmp_buf_reg_offset[i] != -1
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&& (regnum == -1 || regnum == i))
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{
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read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
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regcache_raw_supply (regcache, i, buf);
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}
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}
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}
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static void
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i386fbsd_collect_uthread (const struct regcache *regcache,
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int regnum, CORE_ADDR addr)
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{
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char buf[4];
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int i;
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gdb_assert (regnum >= -1);
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for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
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{
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if (i386fbsd_jmp_buf_reg_offset[i] != -1
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&& (regnum == -1 || regnum == i))
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{
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regcache_raw_collect (regcache, i, buf);
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write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
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}
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}
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}
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static void
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i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Obviously FreeBSD is BSD-based. */
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i386bsd_init_abi (info, gdbarch);
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/* FreeBSD has a different `struct reg', and reserves some space for
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its FPU emulator in `struct fpreg'. */
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tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
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tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
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tdep->sizeof_gregset = 18 * 4;
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tdep->sizeof_fpregset = 176;
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/* FreeBSD uses -freg-struct-return by default. */
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tdep->struct_return = reg_struct_return;
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/* FreeBSD uses a different memory layout. */
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tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
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tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
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/* FreeBSD has a more complete `struct sigcontext'. */
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tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
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tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
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/* FreeBSD provides a user-level threads implementation. */
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bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
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bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
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}
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static void
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i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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/* It's almost identical to FreeBSD a.out. */
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i386fbsdaout_init_abi (info, gdbarch);
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/* Except that it uses ELF. */
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i386_elf_init_abi (info, gdbarch);
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/* FreeBSD ELF uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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}
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/* FreeBSD 4.0-RELEASE or later. */
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/* From <machine/reg.h>. */
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static int i386fbsd4_r_reg_offset[] =
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{
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10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
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16 * 4, 5 * 4, /* %esp, %ebp */
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4 * 4, 3 * 4, /* %esi, %edi */
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13 * 4, 15 * 4, /* %eip, %eflags */
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14 * 4, 17 * 4, /* %cs, %ss */
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2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
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};
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/* From <machine/signal.h>. */
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int i386fbsd4_sc_reg_offset[] =
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{
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20 + 11 * 4, /* %eax */
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20 + 10 * 4, /* %ecx */
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20 + 9 * 4, /* %edx */
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20 + 8 * 4, /* %ebx */
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20 + 17 * 4, /* %esp */
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20 + 6 * 4, /* %ebp */
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20 + 5 * 4, /* %esi */
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20 + 4 * 4, /* %edi */
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20 + 14 * 4, /* %eip */
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20 + 16 * 4, /* %eflags */
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20 + 15 * 4, /* %cs */
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20 + 18 * 4, /* %ss */
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20 + 3 * 4, /* %ds */
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20 + 2 * 4, /* %es */
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20 + 1 * 4, /* %fs */
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20 + 0 * 4 /* %gs */
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};
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static void
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i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Inherit stuff from older releases. We assume that FreeBSD
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4.0-RELEASE always uses ELF. */
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i386fbsd_init_abi (info, gdbarch);
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/* FreeBSD 4.0 introduced a new `struct reg'. */
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tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
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tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
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tdep->sizeof_gregset = 19 * 4;
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/* FreeBSD 4.0 introduced a new `struct sigcontext'. */
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tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
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tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_i386fbsd_tdep (void);
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void
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_initialize_i386fbsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
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i386fbsdaout_init_abi);
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gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
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i386fbsd4_init_abi);
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}
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