Commit | Line | Data |
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0a30fbc4 | 1 | /* GNU/Linux/i386 specific low level interface, for the remote server for GDB. |
6f0f660e | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005 |
0a30fbc4 DJ |
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 | |
6f0f660e EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
0a30fbc4 DJ |
21 | |
22 | #include "server.h" | |
58caa3dc DJ |
23 | #include "linux-low.h" |
24 | #include "i387-fp.h" | |
0a30fbc4 | 25 | |
fd500816 DJ |
26 | /* Correct for all GNU/Linux targets (for quite some time). */ |
27 | #define GDB_GREGSET_T elf_gregset_t | |
28 | #define GDB_FPREGSET_T elf_fpregset_t | |
29 | ||
30 | #ifndef HAVE_ELF_FPREGSET_T | |
31 | /* Make sure we have said types. Not all platforms bring in <linux/elf.h> | |
32 | via <sys/procfs.h>. */ | |
33 | #ifdef HAVE_LINUX_ELF_H | |
34 | #include <linux/elf.h> | |
35 | #endif | |
36 | #endif | |
37 | ||
38 | #include "../gdb_proc_service.h" | |
39 | ||
40 | #include <sys/ptrace.h> | |
41 | ||
0a30fbc4 DJ |
42 | #ifdef HAVE_SYS_REG_H |
43 | #include <sys/reg.h> | |
44 | #endif | |
45 | ||
fd500816 DJ |
46 | #ifndef PTRACE_GET_THREAD_AREA |
47 | #define PTRACE_GET_THREAD_AREA 25 | |
48 | #endif | |
49 | ||
58caa3dc | 50 | /* This module only supports access to the general purpose registers. */ |
0a30fbc4 | 51 | |
2ec06d2e | 52 | #define i386_num_regs 16 |
0a30fbc4 DJ |
53 | |
54 | /* This stuff comes from i386-linux-nat.c. */ | |
55 | ||
56 | /* Mapping between the general-purpose registers in `struct user' | |
57 | format and GDB's register array layout. */ | |
2ec06d2e | 58 | static int i386_regmap[] = |
0a30fbc4 DJ |
59 | { |
60 | EAX * 4, ECX * 4, EDX * 4, EBX * 4, | |
61 | UESP * 4, EBP * 4, ESI * 4, EDI * 4, | |
62 | EIP * 4, EFL * 4, CS * 4, SS * 4, | |
63 | DS * 4, ES * 4, FS * 4, GS * 4 | |
64 | }; | |
65 | ||
fd500816 DJ |
66 | /* Called by libthread_db. */ |
67 | ||
68 | ps_err_e | |
69 | ps_get_thread_area (const struct ps_prochandle *ph, | |
70 | lwpid_t lwpid, int idx, void **base) | |
71 | { | |
72 | unsigned int desc[4]; | |
73 | ||
74 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
75 | (void *) idx, (unsigned long) &desc) < 0) | |
76 | return PS_ERR; | |
77 | ||
78 | *(int *)base = desc[1]; | |
79 | return PS_OK; | |
80 | } | |
81 | ||
2ec06d2e DJ |
82 | static int |
83 | i386_cannot_store_register (int regno) | |
0a30fbc4 | 84 | { |
2ec06d2e | 85 | return (regno >= i386_num_regs); |
0a30fbc4 DJ |
86 | } |
87 | ||
2ec06d2e DJ |
88 | static int |
89 | i386_cannot_fetch_register (int regno) | |
0a30fbc4 | 90 | { |
2ec06d2e | 91 | return (regno >= i386_num_regs); |
0a30fbc4 | 92 | } |
58caa3dc DJ |
93 | |
94 | ||
e9d25b98 | 95 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc DJ |
96 | #include <sys/procfs.h> |
97 | #include <sys/ptrace.h> | |
98 | ||
99 | static void | |
100 | i386_fill_gregset (void *buf) | |
101 | { | |
102 | int i; | |
103 | ||
2ec06d2e DJ |
104 | for (i = 0; i < i386_num_regs; i++) |
105 | collect_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
106 | |
107 | collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
108 | } | |
109 | ||
110 | static void | |
0d62e5e8 | 111 | i386_store_gregset (const void *buf) |
58caa3dc DJ |
112 | { |
113 | int i; | |
114 | ||
2ec06d2e DJ |
115 | for (i = 0; i < i386_num_regs; i++) |
116 | supply_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
117 | |
118 | supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
119 | } | |
120 | ||
121 | static void | |
122 | i386_fill_fpregset (void *buf) | |
123 | { | |
124 | i387_cache_to_fsave (buf); | |
125 | } | |
126 | ||
127 | static void | |
0d62e5e8 | 128 | i386_store_fpregset (const void *buf) |
58caa3dc DJ |
129 | { |
130 | i387_fsave_to_cache (buf); | |
131 | } | |
132 | ||
133 | static void | |
134 | i386_fill_fpxregset (void *buf) | |
135 | { | |
136 | i387_cache_to_fxsave (buf); | |
137 | } | |
138 | ||
139 | static void | |
0d62e5e8 | 140 | i386_store_fpxregset (const void *buf) |
58caa3dc DJ |
141 | { |
142 | i387_fxsave_to_cache (buf); | |
143 | } | |
144 | ||
e9d25b98 | 145 | #endif /* HAVE_PTRACE_GETREGS */ |
58caa3dc DJ |
146 | |
147 | struct regset_info target_regsets[] = { | |
e9d25b98 | 148 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc | 149 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), |
0d62e5e8 | 150 | GENERAL_REGS, |
58caa3dc | 151 | i386_fill_gregset, i386_store_gregset }, |
e9d25b98 | 152 | # ifdef HAVE_PTRACE_GETFPXREGS |
58caa3dc | 153 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), |
0d62e5e8 | 154 | EXTENDED_REGS, |
58caa3dc | 155 | i386_fill_fpxregset, i386_store_fpxregset }, |
e9d25b98 | 156 | # endif |
58caa3dc | 157 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), |
0d62e5e8 | 158 | FP_REGS, |
58caa3dc | 159 | i386_fill_fpregset, i386_store_fpregset }, |
e9d25b98 | 160 | #endif /* HAVE_PTRACE_GETREGS */ |
0d62e5e8 | 161 | { 0, 0, -1, -1, NULL, NULL } |
58caa3dc DJ |
162 | }; |
163 | ||
f450004a | 164 | static const unsigned char i386_breakpoint[] = { 0xCC }; |
611cb4a5 DJ |
165 | #define i386_breakpoint_len 1 |
166 | ||
0d62e5e8 DJ |
167 | extern int debug_threads; |
168 | ||
611cb4a5 | 169 | static CORE_ADDR |
0d62e5e8 | 170 | i386_get_pc () |
611cb4a5 DJ |
171 | { |
172 | unsigned long pc; | |
173 | ||
611cb4a5 | 174 | collect_register_by_name ("eip", &pc); |
0d62e5e8 DJ |
175 | |
176 | if (debug_threads) | |
177 | fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); | |
178 | return pc; | |
611cb4a5 DJ |
179 | } |
180 | ||
181 | static void | |
182 | i386_set_pc (CORE_ADDR newpc) | |
183 | { | |
0d62e5e8 DJ |
184 | if (debug_threads) |
185 | fprintf (stderr, "set pc to %08lx\n", (long) newpc); | |
611cb4a5 | 186 | supply_register_by_name ("eip", &newpc); |
0d62e5e8 DJ |
187 | } |
188 | ||
189 | static int | |
190 | i386_breakpoint_at (CORE_ADDR pc) | |
191 | { | |
192 | unsigned char c; | |
193 | ||
194 | read_inferior_memory (pc, &c, 1); | |
195 | if (c == 0xCC) | |
196 | return 1; | |
611cb4a5 | 197 | |
0d62e5e8 | 198 | return 0; |
611cb4a5 DJ |
199 | } |
200 | ||
2ec06d2e DJ |
201 | struct linux_target_ops the_low_target = { |
202 | i386_num_regs, | |
203 | i386_regmap, | |
204 | i386_cannot_fetch_register, | |
205 | i386_cannot_store_register, | |
0d62e5e8 | 206 | i386_get_pc, |
611cb4a5 DJ |
207 | i386_set_pc, |
208 | i386_breakpoint, | |
209 | i386_breakpoint_len, | |
0d62e5e8 DJ |
210 | NULL, |
211 | 1, | |
212 | i386_breakpoint_at, | |
2ec06d2e | 213 | }; |