Commit | Line | Data |
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0a30fbc4 | 1 | /* GNU/Linux/i386 specific low level interface, for the remote server for GDB. |
6aba47ca | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006, |
9b254dd1 | 3 | 2007, 2008 Free Software Foundation, Inc. |
0a30fbc4 DJ |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
0a30fbc4 DJ |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0a30fbc4 DJ |
19 | |
20 | #include "server.h" | |
58caa3dc DJ |
21 | #include "linux-low.h" |
22 | #include "i387-fp.h" | |
0a30fbc4 | 23 | |
0050a760 | 24 | #include "gdb_proc_service.h" |
fd500816 DJ |
25 | |
26 | #include <sys/ptrace.h> | |
27 | ||
0a30fbc4 DJ |
28 | #ifdef HAVE_SYS_REG_H |
29 | #include <sys/reg.h> | |
30 | #endif | |
31 | ||
fd500816 DJ |
32 | #ifndef PTRACE_GET_THREAD_AREA |
33 | #define PTRACE_GET_THREAD_AREA 25 | |
34 | #endif | |
35 | ||
58caa3dc | 36 | /* This module only supports access to the general purpose registers. */ |
0a30fbc4 | 37 | |
2ec06d2e | 38 | #define i386_num_regs 16 |
0a30fbc4 DJ |
39 | |
40 | /* This stuff comes from i386-linux-nat.c. */ | |
41 | ||
42 | /* Mapping between the general-purpose registers in `struct user' | |
43 | format and GDB's register array layout. */ | |
2ec06d2e | 44 | static int i386_regmap[] = |
0a30fbc4 DJ |
45 | { |
46 | EAX * 4, ECX * 4, EDX * 4, EBX * 4, | |
47 | UESP * 4, EBP * 4, ESI * 4, EDI * 4, | |
48 | EIP * 4, EFL * 4, CS * 4, SS * 4, | |
49 | DS * 4, ES * 4, FS * 4, GS * 4 | |
50 | }; | |
51 | ||
fd500816 DJ |
52 | /* Called by libthread_db. */ |
53 | ||
54 | ps_err_e | |
55 | ps_get_thread_area (const struct ps_prochandle *ph, | |
56 | lwpid_t lwpid, int idx, void **base) | |
57 | { | |
58 | unsigned int desc[4]; | |
59 | ||
60 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
61 | (void *) idx, (unsigned long) &desc) < 0) | |
62 | return PS_ERR; | |
63 | ||
64 | *(int *)base = desc[1]; | |
65 | return PS_OK; | |
66 | } | |
67 | ||
2ec06d2e DJ |
68 | static int |
69 | i386_cannot_store_register (int regno) | |
0a30fbc4 | 70 | { |
2ec06d2e | 71 | return (regno >= i386_num_regs); |
0a30fbc4 DJ |
72 | } |
73 | ||
2ec06d2e DJ |
74 | static int |
75 | i386_cannot_fetch_register (int regno) | |
0a30fbc4 | 76 | { |
2ec06d2e | 77 | return (regno >= i386_num_regs); |
0a30fbc4 | 78 | } |
58caa3dc DJ |
79 | |
80 | ||
e9d25b98 | 81 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc DJ |
82 | #include <sys/procfs.h> |
83 | #include <sys/ptrace.h> | |
84 | ||
85 | static void | |
86 | i386_fill_gregset (void *buf) | |
87 | { | |
88 | int i; | |
89 | ||
2ec06d2e DJ |
90 | for (i = 0; i < i386_num_regs; i++) |
91 | collect_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
92 | |
93 | collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
94 | } | |
95 | ||
96 | static void | |
0d62e5e8 | 97 | i386_store_gregset (const void *buf) |
58caa3dc DJ |
98 | { |
99 | int i; | |
100 | ||
2ec06d2e DJ |
101 | for (i = 0; i < i386_num_regs; i++) |
102 | supply_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
103 | |
104 | supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
105 | } | |
106 | ||
107 | static void | |
108 | i386_fill_fpregset (void *buf) | |
109 | { | |
110 | i387_cache_to_fsave (buf); | |
111 | } | |
112 | ||
113 | static void | |
0d62e5e8 | 114 | i386_store_fpregset (const void *buf) |
58caa3dc DJ |
115 | { |
116 | i387_fsave_to_cache (buf); | |
117 | } | |
118 | ||
119 | static void | |
120 | i386_fill_fpxregset (void *buf) | |
121 | { | |
122 | i387_cache_to_fxsave (buf); | |
123 | } | |
124 | ||
125 | static void | |
0d62e5e8 | 126 | i386_store_fpxregset (const void *buf) |
58caa3dc DJ |
127 | { |
128 | i387_fxsave_to_cache (buf); | |
129 | } | |
130 | ||
e9d25b98 | 131 | #endif /* HAVE_PTRACE_GETREGS */ |
58caa3dc DJ |
132 | |
133 | struct regset_info target_regsets[] = { | |
e9d25b98 | 134 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc | 135 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), |
0d62e5e8 | 136 | GENERAL_REGS, |
58caa3dc | 137 | i386_fill_gregset, i386_store_gregset }, |
e9d25b98 | 138 | # ifdef HAVE_PTRACE_GETFPXREGS |
58caa3dc | 139 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), |
0d62e5e8 | 140 | EXTENDED_REGS, |
58caa3dc | 141 | i386_fill_fpxregset, i386_store_fpxregset }, |
e9d25b98 | 142 | # endif |
58caa3dc | 143 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), |
0d62e5e8 | 144 | FP_REGS, |
58caa3dc | 145 | i386_fill_fpregset, i386_store_fpregset }, |
e9d25b98 | 146 | #endif /* HAVE_PTRACE_GETREGS */ |
0d62e5e8 | 147 | { 0, 0, -1, -1, NULL, NULL } |
58caa3dc DJ |
148 | }; |
149 | ||
f450004a | 150 | static const unsigned char i386_breakpoint[] = { 0xCC }; |
611cb4a5 DJ |
151 | #define i386_breakpoint_len 1 |
152 | ||
0d62e5e8 DJ |
153 | extern int debug_threads; |
154 | ||
611cb4a5 | 155 | static CORE_ADDR |
0d62e5e8 | 156 | i386_get_pc () |
611cb4a5 DJ |
157 | { |
158 | unsigned long pc; | |
159 | ||
611cb4a5 | 160 | collect_register_by_name ("eip", &pc); |
0d62e5e8 DJ |
161 | |
162 | if (debug_threads) | |
163 | fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); | |
164 | return pc; | |
611cb4a5 DJ |
165 | } |
166 | ||
167 | static void | |
168 | i386_set_pc (CORE_ADDR newpc) | |
169 | { | |
0d62e5e8 DJ |
170 | if (debug_threads) |
171 | fprintf (stderr, "set pc to %08lx\n", (long) newpc); | |
611cb4a5 | 172 | supply_register_by_name ("eip", &newpc); |
0d62e5e8 DJ |
173 | } |
174 | ||
175 | static int | |
176 | i386_breakpoint_at (CORE_ADDR pc) | |
177 | { | |
178 | unsigned char c; | |
179 | ||
180 | read_inferior_memory (pc, &c, 1); | |
181 | if (c == 0xCC) | |
182 | return 1; | |
611cb4a5 | 183 | |
0d62e5e8 | 184 | return 0; |
611cb4a5 DJ |
185 | } |
186 | ||
2ec06d2e DJ |
187 | struct linux_target_ops the_low_target = { |
188 | i386_num_regs, | |
189 | i386_regmap, | |
190 | i386_cannot_fetch_register, | |
191 | i386_cannot_store_register, | |
0d62e5e8 | 192 | i386_get_pc, |
611cb4a5 DJ |
193 | i386_set_pc, |
194 | i386_breakpoint, | |
195 | i386_breakpoint_len, | |
0d62e5e8 DJ |
196 | NULL, |
197 | 1, | |
198 | i386_breakpoint_at, | |
23181151 DJ |
199 | NULL, |
200 | NULL, | |
201 | NULL, | |
202 | NULL, | |
203 | 0, | |
204 | "i386" | |
2ec06d2e | 205 | }; |