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, |
0fb0cc75 | 3 | 2007, 2008, 2009 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 | ||
d05b4ac3 UW |
36 | /* Defined in auto-generated file reg-i386-linux.c. */ |
37 | void init_registers_i386_linux (void); | |
38 | ||
39 | ||
58caa3dc | 40 | /* This module only supports access to the general purpose registers. */ |
0a30fbc4 | 41 | |
2ec06d2e | 42 | #define i386_num_regs 16 |
0a30fbc4 DJ |
43 | |
44 | /* This stuff comes from i386-linux-nat.c. */ | |
45 | ||
46 | /* Mapping between the general-purpose registers in `struct user' | |
47 | format and GDB's register array layout. */ | |
2ec06d2e | 48 | static int i386_regmap[] = |
0a30fbc4 DJ |
49 | { |
50 | EAX * 4, ECX * 4, EDX * 4, EBX * 4, | |
51 | UESP * 4, EBP * 4, ESI * 4, EDI * 4, | |
52 | EIP * 4, EFL * 4, CS * 4, SS * 4, | |
53 | DS * 4, ES * 4, FS * 4, GS * 4 | |
54 | }; | |
55 | ||
fd500816 DJ |
56 | /* Called by libthread_db. */ |
57 | ||
58 | ps_err_e | |
59 | ps_get_thread_area (const struct ps_prochandle *ph, | |
60 | lwpid_t lwpid, int idx, void **base) | |
61 | { | |
62 | unsigned int desc[4]; | |
63 | ||
64 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
65 | (void *) idx, (unsigned long) &desc) < 0) | |
66 | return PS_ERR; | |
67 | ||
68 | *(int *)base = desc[1]; | |
69 | return PS_OK; | |
70 | } | |
71 | ||
2ec06d2e DJ |
72 | static int |
73 | i386_cannot_store_register (int regno) | |
0a30fbc4 | 74 | { |
2ec06d2e | 75 | return (regno >= i386_num_regs); |
0a30fbc4 DJ |
76 | } |
77 | ||
2ec06d2e DJ |
78 | static int |
79 | i386_cannot_fetch_register (int regno) | |
0a30fbc4 | 80 | { |
2ec06d2e | 81 | return (regno >= i386_num_regs); |
0a30fbc4 | 82 | } |
58caa3dc DJ |
83 | |
84 | ||
e9d25b98 | 85 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc DJ |
86 | #include <sys/procfs.h> |
87 | #include <sys/ptrace.h> | |
88 | ||
89 | static void | |
90 | i386_fill_gregset (void *buf) | |
91 | { | |
92 | int i; | |
93 | ||
2ec06d2e DJ |
94 | for (i = 0; i < i386_num_regs; i++) |
95 | collect_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
96 | |
97 | collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
98 | } | |
99 | ||
100 | static void | |
0d62e5e8 | 101 | i386_store_gregset (const void *buf) |
58caa3dc DJ |
102 | { |
103 | int i; | |
104 | ||
2ec06d2e DJ |
105 | for (i = 0; i < i386_num_regs; i++) |
106 | supply_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
107 | |
108 | supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
109 | } | |
110 | ||
111 | static void | |
112 | i386_fill_fpregset (void *buf) | |
113 | { | |
114 | i387_cache_to_fsave (buf); | |
115 | } | |
116 | ||
117 | static void | |
0d62e5e8 | 118 | i386_store_fpregset (const void *buf) |
58caa3dc DJ |
119 | { |
120 | i387_fsave_to_cache (buf); | |
121 | } | |
122 | ||
123 | static void | |
124 | i386_fill_fpxregset (void *buf) | |
125 | { | |
126 | i387_cache_to_fxsave (buf); | |
127 | } | |
128 | ||
129 | static void | |
0d62e5e8 | 130 | i386_store_fpxregset (const void *buf) |
58caa3dc DJ |
131 | { |
132 | i387_fxsave_to_cache (buf); | |
133 | } | |
134 | ||
e9d25b98 | 135 | #endif /* HAVE_PTRACE_GETREGS */ |
58caa3dc DJ |
136 | |
137 | struct regset_info target_regsets[] = { | |
e9d25b98 | 138 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc | 139 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), |
0d62e5e8 | 140 | GENERAL_REGS, |
58caa3dc | 141 | i386_fill_gregset, i386_store_gregset }, |
e9d25b98 | 142 | # ifdef HAVE_PTRACE_GETFPXREGS |
58caa3dc | 143 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), |
0d62e5e8 | 144 | EXTENDED_REGS, |
58caa3dc | 145 | i386_fill_fpxregset, i386_store_fpxregset }, |
e9d25b98 | 146 | # endif |
58caa3dc | 147 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), |
0d62e5e8 | 148 | FP_REGS, |
58caa3dc | 149 | i386_fill_fpregset, i386_store_fpregset }, |
e9d25b98 | 150 | #endif /* HAVE_PTRACE_GETREGS */ |
0d62e5e8 | 151 | { 0, 0, -1, -1, NULL, NULL } |
58caa3dc DJ |
152 | }; |
153 | ||
f450004a | 154 | static const unsigned char i386_breakpoint[] = { 0xCC }; |
611cb4a5 DJ |
155 | #define i386_breakpoint_len 1 |
156 | ||
0d62e5e8 DJ |
157 | extern int debug_threads; |
158 | ||
611cb4a5 | 159 | static CORE_ADDR |
0d62e5e8 | 160 | i386_get_pc () |
611cb4a5 DJ |
161 | { |
162 | unsigned long pc; | |
163 | ||
611cb4a5 | 164 | collect_register_by_name ("eip", &pc); |
0d62e5e8 DJ |
165 | |
166 | if (debug_threads) | |
167 | fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); | |
168 | return pc; | |
611cb4a5 DJ |
169 | } |
170 | ||
171 | static void | |
172 | i386_set_pc (CORE_ADDR newpc) | |
173 | { | |
0d62e5e8 DJ |
174 | if (debug_threads) |
175 | fprintf (stderr, "set pc to %08lx\n", (long) newpc); | |
611cb4a5 | 176 | supply_register_by_name ("eip", &newpc); |
0d62e5e8 DJ |
177 | } |
178 | ||
179 | static int | |
180 | i386_breakpoint_at (CORE_ADDR pc) | |
181 | { | |
182 | unsigned char c; | |
183 | ||
184 | read_inferior_memory (pc, &c, 1); | |
185 | if (c == 0xCC) | |
186 | return 1; | |
611cb4a5 | 187 | |
0d62e5e8 | 188 | return 0; |
611cb4a5 DJ |
189 | } |
190 | ||
2ec06d2e | 191 | struct linux_target_ops the_low_target = { |
d05b4ac3 | 192 | init_registers_i386_linux, |
2ec06d2e DJ |
193 | i386_num_regs, |
194 | i386_regmap, | |
195 | i386_cannot_fetch_register, | |
196 | i386_cannot_store_register, | |
0d62e5e8 | 197 | i386_get_pc, |
611cb4a5 DJ |
198 | i386_set_pc, |
199 | i386_breakpoint, | |
200 | i386_breakpoint_len, | |
0d62e5e8 DJ |
201 | NULL, |
202 | 1, | |
203 | i386_breakpoint_at, | |
23181151 DJ |
204 | NULL, |
205 | NULL, | |
206 | NULL, | |
207 | NULL, | |
ee1a7ae4 UW |
208 | NULL, |
209 | NULL, | |
2ec06d2e | 210 | }; |