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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [i386fbsd-tdep.c] - Blame information for rev 258

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Line No. Rev Author Line
1 24 jeremybenn
/* Target-dependent code for FreeBSD/i386.
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   Copyright (C) 2003, 2004, 2005, 2007, 2008 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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