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0a30fbc4 | 1 | /* GNU/Linux/i386 specific low level interface, for the remote server for GDB. |
6aba47ca DJ |
2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006, |
3 | 2007 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 | |
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 | |
0050a760 | 26 | #include "gdb_proc_service.h" |
fd500816 DJ |
27 | |
28 | #include <sys/ptrace.h> | |
29 | ||
0a30fbc4 DJ |
30 | #ifdef HAVE_SYS_REG_H |
31 | #include <sys/reg.h> | |
32 | #endif | |
33 | ||
fd500816 DJ |
34 | #ifndef PTRACE_GET_THREAD_AREA |
35 | #define PTRACE_GET_THREAD_AREA 25 | |
36 | #endif | |
37 | ||
58caa3dc | 38 | /* This module only supports access to the general purpose registers. */ |
0a30fbc4 | 39 | |
2ec06d2e | 40 | #define i386_num_regs 16 |
0a30fbc4 DJ |
41 | |
42 | /* This stuff comes from i386-linux-nat.c. */ | |
43 | ||
44 | /* Mapping between the general-purpose registers in `struct user' | |
45 | format and GDB's register array layout. */ | |
2ec06d2e | 46 | static int i386_regmap[] = |
0a30fbc4 DJ |
47 | { |
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 | |
52 | }; | |
53 | ||
fd500816 DJ |
54 | /* Called by libthread_db. */ |
55 | ||
56 | ps_err_e | |
57 | ps_get_thread_area (const struct ps_prochandle *ph, | |
58 | lwpid_t lwpid, int idx, void **base) | |
59 | { | |
60 | unsigned int desc[4]; | |
61 | ||
62 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
63 | (void *) idx, (unsigned long) &desc) < 0) | |
64 | return PS_ERR; | |
65 | ||
66 | *(int *)base = desc[1]; | |
67 | return PS_OK; | |
68 | } | |
69 | ||
2ec06d2e DJ |
70 | static int |
71 | i386_cannot_store_register (int regno) | |
0a30fbc4 | 72 | { |
2ec06d2e | 73 | return (regno >= i386_num_regs); |
0a30fbc4 DJ |
74 | } |
75 | ||
2ec06d2e DJ |
76 | static int |
77 | i386_cannot_fetch_register (int regno) | |
0a30fbc4 | 78 | { |
2ec06d2e | 79 | return (regno >= i386_num_regs); |
0a30fbc4 | 80 | } |
58caa3dc DJ |
81 | |
82 | ||
e9d25b98 | 83 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc DJ |
84 | #include <sys/procfs.h> |
85 | #include <sys/ptrace.h> | |
86 | ||
87 | static void | |
88 | i386_fill_gregset (void *buf) | |
89 | { | |
90 | int i; | |
91 | ||
2ec06d2e DJ |
92 | for (i = 0; i < i386_num_regs; i++) |
93 | collect_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
94 | |
95 | collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
96 | } | |
97 | ||
98 | static void | |
0d62e5e8 | 99 | i386_store_gregset (const void *buf) |
58caa3dc DJ |
100 | { |
101 | int i; | |
102 | ||
2ec06d2e DJ |
103 | for (i = 0; i < i386_num_regs; i++) |
104 | supply_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
105 | |
106 | supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
107 | } | |
108 | ||
109 | static void | |
110 | i386_fill_fpregset (void *buf) | |
111 | { | |
112 | i387_cache_to_fsave (buf); | |
113 | } | |
114 | ||
115 | static void | |
0d62e5e8 | 116 | i386_store_fpregset (const void *buf) |
58caa3dc DJ |
117 | { |
118 | i387_fsave_to_cache (buf); | |
119 | } | |
120 | ||
121 | static void | |
122 | i386_fill_fpxregset (void *buf) | |
123 | { | |
124 | i387_cache_to_fxsave (buf); | |
125 | } | |
126 | ||
127 | static void | |
0d62e5e8 | 128 | i386_store_fpxregset (const void *buf) |
58caa3dc DJ |
129 | { |
130 | i387_fxsave_to_cache (buf); | |
131 | } | |
132 | ||
e9d25b98 | 133 | #endif /* HAVE_PTRACE_GETREGS */ |
58caa3dc DJ |
134 | |
135 | struct regset_info target_regsets[] = { | |
e9d25b98 | 136 | #ifdef HAVE_PTRACE_GETREGS |
58caa3dc | 137 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), |
0d62e5e8 | 138 | GENERAL_REGS, |
58caa3dc | 139 | i386_fill_gregset, i386_store_gregset }, |
e9d25b98 | 140 | # ifdef HAVE_PTRACE_GETFPXREGS |
58caa3dc | 141 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), |
0d62e5e8 | 142 | EXTENDED_REGS, |
58caa3dc | 143 | i386_fill_fpxregset, i386_store_fpxregset }, |
e9d25b98 | 144 | # endif |
58caa3dc | 145 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), |
0d62e5e8 | 146 | FP_REGS, |
58caa3dc | 147 | i386_fill_fpregset, i386_store_fpregset }, |
e9d25b98 | 148 | #endif /* HAVE_PTRACE_GETREGS */ |
0d62e5e8 | 149 | { 0, 0, -1, -1, NULL, NULL } |
58caa3dc DJ |
150 | }; |
151 | ||
f450004a | 152 | static const unsigned char i386_breakpoint[] = { 0xCC }; |
611cb4a5 DJ |
153 | #define i386_breakpoint_len 1 |
154 | ||
0d62e5e8 DJ |
155 | extern int debug_threads; |
156 | ||
611cb4a5 | 157 | static CORE_ADDR |
0d62e5e8 | 158 | i386_get_pc () |
611cb4a5 DJ |
159 | { |
160 | unsigned long pc; | |
161 | ||
611cb4a5 | 162 | collect_register_by_name ("eip", &pc); |
0d62e5e8 DJ |
163 | |
164 | if (debug_threads) | |
165 | fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); | |
166 | return pc; | |
611cb4a5 DJ |
167 | } |
168 | ||
169 | static void | |
170 | i386_set_pc (CORE_ADDR newpc) | |
171 | { | |
0d62e5e8 DJ |
172 | if (debug_threads) |
173 | fprintf (stderr, "set pc to %08lx\n", (long) newpc); | |
611cb4a5 | 174 | supply_register_by_name ("eip", &newpc); |
0d62e5e8 DJ |
175 | } |
176 | ||
177 | static int | |
178 | i386_breakpoint_at (CORE_ADDR pc) | |
179 | { | |
180 | unsigned char c; | |
181 | ||
182 | read_inferior_memory (pc, &c, 1); | |
183 | if (c == 0xCC) | |
184 | return 1; | |
611cb4a5 | 185 | |
0d62e5e8 | 186 | return 0; |
611cb4a5 DJ |
187 | } |
188 | ||
2ec06d2e DJ |
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, | |
0d62e5e8 | 194 | i386_get_pc, |
611cb4a5 DJ |
195 | i386_set_pc, |
196 | i386_breakpoint, | |
197 | i386_breakpoint_len, | |
0d62e5e8 DJ |
198 | NULL, |
199 | 1, | |
200 | i386_breakpoint_at, | |
2ec06d2e | 201 | }; |