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[/] [or1k/] [trunk/] [gdb-5.3/] [gdb/] [gdbserver/] [linux-i386-low.c] - Blame information for rev 1765

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1 1181 sfurman
/* GNU/Linux/i386 specific low level interface, for the remote server for GDB.
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   Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
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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 2 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, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include "server.h"
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#include "linux-low.h"
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#include "i387-fp.h"
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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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/* This module only supports access to the general purpose registers.  */
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#define i386_num_regs 16
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/* This stuff comes from i386-linux-nat.c.  */
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/* Mapping between the general-purpose registers in `struct user'
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   format and GDB's register array layout.  */
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static int i386_regmap[] =
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{
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  EAX * 4, ECX * 4, EDX * 4, EBX * 4,
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  UESP * 4, EBP * 4, ESI * 4, EDI * 4,
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  EIP * 4, EFL * 4, CS * 4, SS * 4,
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  DS * 4, ES * 4, FS * 4, GS * 4
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};
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static int
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i386_cannot_store_register (int regno)
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{
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  return (regno >= i386_num_regs);
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}
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static int
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i386_cannot_fetch_register (int regno)
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{
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  return (regno >= i386_num_regs);
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}
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#ifdef HAVE_LINUX_REGSETS
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#include <sys/procfs.h>
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#include <sys/ptrace.h>
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static void
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i386_fill_gregset (void *buf)
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{
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  int i;
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  for (i = 0; i < i386_num_regs; i++)
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    collect_register (i, ((char *) buf) + i386_regmap[i]);
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  collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
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}
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static void
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i386_store_gregset (const void *buf)
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{
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  int i;
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  for (i = 0; i < i386_num_regs; i++)
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    supply_register (i, ((char *) buf) + i386_regmap[i]);
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  supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
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}
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static void
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i386_fill_fpregset (void *buf)
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{
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  i387_cache_to_fsave (buf);
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}
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static void
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i386_store_fpregset (const void *buf)
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{
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  i387_fsave_to_cache (buf);
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}
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static void
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i386_fill_fpxregset (void *buf)
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{
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  i387_cache_to_fxsave (buf);
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}
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static void
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i386_store_fpxregset (const void *buf)
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{
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  i387_fxsave_to_cache (buf);
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}
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struct regset_info target_regsets[] = {
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  { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
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    GENERAL_REGS,
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    i386_fill_gregset, i386_store_gregset },
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#ifdef HAVE_PTRACE_GETFPXREGS
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  { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
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    EXTENDED_REGS,
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    i386_fill_fpxregset, i386_store_fpxregset },
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#endif
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  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
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    FP_REGS,
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    i386_fill_fpregset, i386_store_fpregset },
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  { 0, 0, -1, -1, NULL, NULL }
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};
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#endif /* HAVE_LINUX_REGSETS */
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static const char i386_breakpoint[] = { 0xCC };
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#define i386_breakpoint_len 1
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extern int debug_threads;
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static CORE_ADDR
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i386_get_pc ()
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{
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  unsigned long pc;
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  collect_register_by_name ("eip", &pc);
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  if (debug_threads)
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    fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
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  return pc;
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}
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static void
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i386_set_pc (CORE_ADDR newpc)
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{
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  if (debug_threads)
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    fprintf (stderr, "set pc to %08lx\n", (long) newpc);
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  supply_register_by_name ("eip", &newpc);
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}
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static int
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i386_breakpoint_at (CORE_ADDR pc)
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{
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  unsigned char c;
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  read_inferior_memory (pc, &c, 1);
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  if (c == 0xCC)
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    return 1;
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  return 0;
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}
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struct linux_target_ops the_low_target = {
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  i386_num_regs,
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  i386_regmap,
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  i386_cannot_fetch_register,
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  i386_cannot_store_register,
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  i386_get_pc,
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  i386_set_pc,
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  i386_breakpoint,
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  i386_breakpoint_len,
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  NULL,
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  1,
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  i386_breakpoint_at,
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};

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