gdb/gdbserver/linux-i386-low.c

   1 /* GNU/Linux/i386 specific low level interface, for the remote server for GDB.
   2    Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "server.h"
  23 #include "linux-low.h"
  24 #include "i387-fp.h"
  25
  26 #ifdef HAVE_SYS_REG_H
  27 #include <sys/reg.h>
  28 #endif
  29
  30 /* This module only supports access to the general purpose registers.  */
  31
  32 #define i386_num_regs 16
  33
  34 /* This stuff comes from i386-linux-nat.c.  */
  35
  36 /* Mapping between the general-purpose registers in `struct user'
  37    format and GDB's register array layout.  */
  38 static int i386_regmap[] =
  39 {
  40   EAX * 4, ECX * 4, EDX * 4, EBX * 4,
  41   UESP * 4, EBP * 4, ESI * 4, EDI * 4,
  42   EIP * 4, EFL * 4, CS * 4, SS * 4,
  43   DS * 4, ES * 4, FS * 4, GS * 4
  44 };
  45
  46 static int
  47 i386_cannot_store_register (int regno)
  48 {
  49   return (regno >= i386_num_regs);
  50 }
  51
  52 static int
  53 i386_cannot_fetch_register (int regno)
  54 {
  55   return (regno >= i386_num_regs);
  56 }
  57
  58
  59 #ifdef HAVE_LINUX_REGSETS
  60 #include <sys/procfs.h>
  61 #include <sys/ptrace.h>
  62
  63 static void
  64 i386_fill_gregset (void *buf)
  65 {
  66   int i;
  67
  68   for (i = 0; i < i386_num_regs; i++)
  69     collect_register (i, ((char *) buf) + i386_regmap[i]);
  70
  71   collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
  72 }
  73
  74 static void
  75 i386_store_gregset (void *buf)
  76 {
  77   int i;
  78
  79   for (i = 0; i < i386_num_regs; i++)
  80     supply_register (i, ((char *) buf) + i386_regmap[i]);
  81
  82   supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
  83 }
  84
  85 static void
  86 i386_fill_fpregset (void *buf)
  87 {
  88   i387_cache_to_fsave (buf);
  89 }
  90
  91 static void
  92 i386_store_fpregset (void *buf)
  93 {
  94   i387_fsave_to_cache (buf);
  95 }
  96
  97 static void
  98 i386_fill_fpxregset (void *buf)
  99 {
 100   i387_cache_to_fxsave (buf);
 101 }
 102
 103 static void
 104 i386_store_fpxregset (void *buf)
 105 {
 106   i387_fxsave_to_cache (buf);
 107 }
 108
 109
 110 struct regset_info target_regsets[] = {
 111   { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
 112     i386_fill_gregset, i386_store_gregset },
 113 #ifdef HAVE_PTRACE_GETFPXREGS
 114   { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
 115     i386_fill_fpxregset, i386_store_fpxregset },
 116 #endif
 117   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
 118     i386_fill_fpregset, i386_store_fpregset },
 119   { 0, 0, -1, NULL, NULL }
 120 };
 121
 122 #endif /* HAVE_LINUX_REGSETS */
 123
 124 static const char i386_breakpoint[] = { 0xCC };
 125 #define i386_breakpoint_len 1
 126
 127 static CORE_ADDR
 128 i386_stop_pc ()
 129 {
 130   unsigned long pc;
 131
 132   /* Overkill */
 133   fetch_inferior_registers (0);
 134
 135   collect_register_by_name ("eip", &pc);
 136   return pc - 1;
 137 }
 138
 139 static void
 140 i386_set_pc (CORE_ADDR newpc)
 141 {
 142   supply_register_by_name ("eip", &newpc);
 143
 144   /* Overkill */
 145   store_inferior_registers (0);
 146 }
 147
 148 struct linux_target_ops the_low_target = {
 149   i386_num_regs,
 150   i386_regmap,
 151   i386_cannot_fetch_register,
 152   i386_cannot_store_register,
 153   i386_stop_pc,
 154   i386_set_pc,
 155   i386_breakpoint,
 156   i386_breakpoint_len,
 157 };