- /* Target-dependent code for FreeBSD/i386.
- Copyright (C) 2003-2015 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "arch-utils.h"
- #include "gdbcore.h"
- #include "osabi.h"
- #include "regcache.h"
- #include "i386-tdep.h"
- #include "i387-tdep.h"
- #include "bsd-uthread.h"
- #include "fbsd-tdep.h"
- #include "solib-svr4.h"
- /* FreeBSD 3.0-RELEASE or later. */
- /* From <machine/reg.h>. */
- static int i386fbsd_r_reg_offset[] =
- {
- 9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */
- 15 * 4, 4 * 4, /* %esp, %ebp */
- 3 * 4, 2 * 4, /* %esi, %edi */
- 12 * 4, 14 * 4, /* %eip, %eflags */
- 13 * 4, 16 * 4, /* %cs, %ss */
- 1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */
- };
- /* Sigtramp routine location. */
- CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
- CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
- /* From <machine/signal.h>. */
- int i386fbsd_sc_reg_offset[] =
- {
- 8 + 14 * 4, /* %eax */
- 8 + 13 * 4, /* %ecx */
- 8 + 12 * 4, /* %edx */
- 8 + 11 * 4, /* %ebx */
- 8 + 0 * 4, /* %esp */
- 8 + 1 * 4, /* %ebp */
- 8 + 10 * 4, /* %esi */
- 8 + 9 * 4, /* %edi */
- 8 + 3 * 4, /* %eip */
- 8 + 4 * 4, /* %eflags */
- 8 + 7 * 4, /* %cs */
- 8 + 8 * 4, /* %ss */
- 8 + 6 * 4, /* %ds */
- 8 + 5 * 4, /* %es */
- 8 + 15 * 4, /* %fs */
- 8 + 16 * 4 /* %gs */
- };
- /* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
- static int i386fbsd_jmp_buf_reg_offset[] =
- {
- -1, /* %eax */
- -1, /* %ecx */
- -1, /* %edx */
- 1 * 4, /* %ebx */
- 2 * 4, /* %esp */
- 3 * 4, /* %ebp */
- 4 * 4, /* %esi */
- 5 * 4, /* %edi */
- 0 * 4 /* %eip */
- };
- static void
- i386fbsd_supply_uthread (struct regcache *regcache,
- int regnum, CORE_ADDR addr)
- {
- gdb_byte buf[4];
- int i;
- gdb_assert (regnum >= -1);
- for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
- {
- if (i386fbsd_jmp_buf_reg_offset[i] != -1
- && (regnum == -1 || regnum == i))
- {
- read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
- regcache_raw_supply (regcache, i, buf);
- }
- }
- }
- static void
- i386fbsd_collect_uthread (const struct regcache *regcache,
- int regnum, CORE_ADDR addr)
- {
- gdb_byte buf[4];
- int i;
- gdb_assert (regnum >= -1);
- for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
- {
- if (i386fbsd_jmp_buf_reg_offset[i] != -1
- && (regnum == -1 || regnum == i))
- {
- regcache_raw_collect (regcache, i, buf);
- write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
- }
- }
- }
- static void
- i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Obviously FreeBSD is BSD-based. */
- i386bsd_init_abi (info, gdbarch);
- /* FreeBSD has a different `struct reg', and reserves some space for
- its FPU emulator in `struct fpreg'. */
- tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
- tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
- tdep->sizeof_gregset = 18 * 4;
- tdep->sizeof_fpregset = 176;
- /* FreeBSD uses -freg-struct-return by default. */
- tdep->struct_return = reg_struct_return;
- /* FreeBSD uses a different memory layout. */
- tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
- tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
- /* FreeBSD has a more complete `struct sigcontext'. */
- tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
- tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
- /* FreeBSD provides a user-level threads implementation. */
- bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
- bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
- }
- static void
- i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- /* It's almost identical to FreeBSD a.out. */
- i386fbsdaout_init_abi (info, gdbarch);
- /* Except that it uses ELF. */
- i386_elf_init_abi (info, gdbarch);
- /* FreeBSD ELF uses SVR4-style shared libraries. */
- set_solib_svr4_fetch_link_map_offsets
- (gdbarch, svr4_ilp32_fetch_link_map_offsets);
- }
- /* FreeBSD 4.0-RELEASE or later. */
- /* From <machine/reg.h>. */
- static int i386fbsd4_r_reg_offset[] =
- {
- 10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
- 16 * 4, 5 * 4, /* %esp, %ebp */
- 4 * 4, 3 * 4, /* %esi, %edi */
- 13 * 4, 15 * 4, /* %eip, %eflags */
- 14 * 4, 17 * 4, /* %cs, %ss */
- 2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
- };
- /* From <machine/signal.h>. */
- int i386fbsd4_sc_reg_offset[] =
- {
- 20 + 11 * 4, /* %eax */
- 20 + 10 * 4, /* %ecx */
- 20 + 9 * 4, /* %edx */
- 20 + 8 * 4, /* %ebx */
- 20 + 17 * 4, /* %esp */
- 20 + 6 * 4, /* %ebp */
- 20 + 5 * 4, /* %esi */
- 20 + 4 * 4, /* %edi */
- 20 + 14 * 4, /* %eip */
- 20 + 16 * 4, /* %eflags */
- 20 + 15 * 4, /* %cs */
- 20 + 18 * 4, /* %ss */
- 20 + 3 * 4, /* %ds */
- 20 + 2 * 4, /* %es */
- 20 + 1 * 4, /* %fs */
- 20 + 0 * 4 /* %gs */
- };
- static void
- i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Generic FreeBSD support. */
- fbsd_init_abi (info, gdbarch);
- /* Inherit stuff from older releases. We assume that FreeBSD
- 4.0-RELEASE always uses ELF. */
- i386fbsd_init_abi (info, gdbarch);
- /* FreeBSD 4.0 introduced a new `struct reg'. */
- tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
- tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
- tdep->sizeof_gregset = 19 * 4;
- /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
- tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
- tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
- }
- /* Provide a prototype to silence -Wmissing-prototypes. */
- void _initialize_i386fbsd_tdep (void);
- void
- _initialize_i386fbsd_tdep (void)
- {
- gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
- i386fbsdaout_init_abi);
- gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
- i386fbsd4_init_abi);
- }