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[netbsd-mini2440.git] / gnu / dist / gdb6 / gdb / gdbserver / linux-i386-low.c
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1 /* GNU/Linux/i386 specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006
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., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 #include "server.h"
23 #include "linux-low.h"
24 #include "i387-fp.h"
26 #include "gdb_proc_service.h"
28 #include <sys/ptrace.h>
30 #ifdef HAVE_SYS_REG_H
31 #include <sys/reg.h>
32 #endif
34 #ifndef PTRACE_GET_THREAD_AREA
35 #define PTRACE_GET_THREAD_AREA 25
36 #endif
38 /* This module only supports access to the general purpose registers. */
40 #define i386_num_regs 16
42 /* This stuff comes from i386-linux-nat.c. */
44 /* Mapping between the general-purpose registers in `struct user'
45 format and GDB's register array layout. */
46 static int i386_regmap[] =
48 EAX * 4, ECX * 4, EDX * 4, EBX * 4,
49 UESP * 4, EBP * 4, ESI * 4, EDI * 4,
50 EIP * 4, EFL * 4, CS * 4, SS * 4,
51 DS * 4, ES * 4, FS * 4, GS * 4
54 /* Called by libthread_db. */
56 ps_err_e
57 ps_get_thread_area (const struct ps_prochandle *ph,
58 lwpid_t lwpid, int idx, void **base)
60 unsigned int desc[4];
62 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
63 (void *) idx, (unsigned long) &desc) < 0)
64 return PS_ERR;
66 *(int *)base = desc[1];
67 return PS_OK;
70 static int
71 i386_cannot_store_register (int regno)
73 return (regno >= i386_num_regs);
76 static int
77 i386_cannot_fetch_register (int regno)
79 return (regno >= i386_num_regs);
83 #ifdef HAVE_PTRACE_GETREGS
84 #include <sys/procfs.h>
85 #include <sys/ptrace.h>
87 static void
88 i386_fill_gregset (void *buf)
90 int i;
92 for (i = 0; i < i386_num_regs; i++)
93 collect_register (i, ((char *) buf) + i386_regmap[i]);
95 collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
98 static void
99 i386_store_gregset (const void *buf)
101 int i;
103 for (i = 0; i < i386_num_regs; i++)
104 supply_register (i, ((char *) buf) + i386_regmap[i]);
106 supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
109 static void
110 i386_fill_fpregset (void *buf)
112 i387_cache_to_fsave (buf);
115 static void
116 i386_store_fpregset (const void *buf)
118 i387_fsave_to_cache (buf);
121 static void
122 i386_fill_fpxregset (void *buf)
124 i387_cache_to_fxsave (buf);
127 static void
128 i386_store_fpxregset (const void *buf)
130 i387_fxsave_to_cache (buf);
133 #endif /* HAVE_PTRACE_GETREGS */
135 struct regset_info target_regsets[] = {
136 #ifdef HAVE_PTRACE_GETREGS
137 { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
138 GENERAL_REGS,
139 i386_fill_gregset, i386_store_gregset },
140 # ifdef HAVE_PTRACE_GETFPXREGS
141 { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
142 EXTENDED_REGS,
143 i386_fill_fpxregset, i386_store_fpxregset },
144 # endif
145 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
146 FP_REGS,
147 i386_fill_fpregset, i386_store_fpregset },
148 #endif /* HAVE_PTRACE_GETREGS */
149 { 0, 0, -1, -1, NULL, NULL }
152 static const unsigned char i386_breakpoint[] = { 0xCC };
153 #define i386_breakpoint_len 1
155 extern int debug_threads;
157 static CORE_ADDR
158 i386_get_pc ()
160 unsigned long pc;
162 collect_register_by_name ("eip", &pc);
164 if (debug_threads)
165 fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
166 return pc;
169 static void
170 i386_set_pc (CORE_ADDR newpc)
172 if (debug_threads)
173 fprintf (stderr, "set pc to %08lx\n", (long) newpc);
174 supply_register_by_name ("eip", &newpc);
177 static int
178 i386_breakpoint_at (CORE_ADDR pc)
180 unsigned char c;
182 read_inferior_memory (pc, &c, 1);
183 if (c == 0xCC)
184 return 1;
186 return 0;
189 struct linux_target_ops the_low_target = {
190 i386_num_regs,
191 i386_regmap,
192 i386_cannot_fetch_register,
193 i386_cannot_store_register,
194 i386_get_pc,
195 i386_set_pc,
196 i386_breakpoint,
197 i386_breakpoint_len,
198 NULL,
200 i386_breakpoint_at,