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.
5 This file is part of GDB.
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.
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.
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. */
23 #include "linux-low.h"
30 /* This module only supports access to the general purpose registers. */
32 #define i386_num_regs 16
34 /* This stuff comes from i386-linux-nat.c. */
36 /* Mapping between the general-purpose registers in `struct user'
37 format and GDB's register array layout. */
38 static int i386_regmap[] =
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
47 i386_cannot_store_register (int regno)
49 return (regno >= i386_num_regs);
53 i386_cannot_fetch_register (int regno)
55 return (regno >= i386_num_regs);
59 #ifdef HAVE_LINUX_REGSETS
60 #include <sys/procfs.h>
61 #include <sys/ptrace.h>
64 i386_fill_gregset (void *buf)
68 for (i = 0; i < i386_num_regs; i++)
69 collect_register (i, ((char *) buf) + i386_regmap[i]);
71 collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
75 i386_store_gregset (const void *buf)
79 for (i = 0; i < i386_num_regs; i++)
80 supply_register (i, ((char *) buf) + i386_regmap[i]);
82 supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
86 i386_fill_fpregset (void *buf)
88 i387_cache_to_fsave (buf);
92 i386_store_fpregset (const void *buf)
94 i387_fsave_to_cache (buf);
98 i386_fill_fpxregset (void *buf)
100 i387_cache_to_fxsave (buf);
104 i386_store_fpxregset (const void *buf)
106 i387_fxsave_to_cache (buf);
110 struct regset_info target_regsets[] = {
111 { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
113 i386_fill_gregset, i386_store_gregset },
114 #ifdef HAVE_PTRACE_GETFPXREGS
115 { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
117 i386_fill_fpxregset, i386_store_fpxregset },
119 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
121 i386_fill_fpregset, i386_store_fpregset },
122 { 0, 0, -1, -1, NULL, NULL }
125 #endif /* HAVE_LINUX_REGSETS */
127 static const char i386_breakpoint[] = { 0xCC };
128 #define i386_breakpoint_len 1
130 extern int debug_threads;
137 collect_register_by_name ("eip", &pc);
140 fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
145 i386_set_pc (CORE_ADDR newpc)
148 fprintf (stderr, "set pc to %08lx\n", (long) newpc);
149 supply_register_by_name ("eip", &newpc);
153 i386_breakpoint_at (CORE_ADDR pc)
157 read_inferior_memory (pc, &c, 1);
164 struct linux_target_ops the_low_target = {
167 i386_cannot_fetch_register,
168 i386_cannot_store_register,