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0a30fbc4 DJ |
1 | /* GNU/Linux/i386 specific low level interface, for the remote server for GDB. |
2 | Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 | |
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 | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "server.h" | |
58caa3dc DJ |
23 | #include "linux-low.h" |
24 | #include "i387-fp.h" | |
0a30fbc4 DJ |
25 | |
26 | #ifdef HAVE_SYS_REG_H | |
27 | #include <sys/reg.h> | |
28 | #endif | |
29 | ||
58caa3dc | 30 | /* This module only supports access to the general purpose registers. */ |
0a30fbc4 | 31 | |
2ec06d2e | 32 | #define i386_num_regs 16 |
0a30fbc4 DJ |
33 | |
34 | /* This stuff comes from i386-linux-nat.c. */ | |
35 | ||
36 | /* Mapping between the general-purpose registers in `struct user' | |
37 | format and GDB's register array layout. */ | |
2ec06d2e | 38 | static int i386_regmap[] = |
0a30fbc4 DJ |
39 | { |
40 | EAX * 4, ECX * 4, EDX * 4, EBX * 4, | |
41 | UESP * 4, EBP * 4, ESI * 4, EDI * 4, | |
42 | EIP * 4, EFL * 4, CS * 4, SS * 4, | |
43 | DS * 4, ES * 4, FS * 4, GS * 4 | |
44 | }; | |
45 | ||
2ec06d2e DJ |
46 | static int |
47 | i386_cannot_store_register (int regno) | |
0a30fbc4 | 48 | { |
2ec06d2e | 49 | return (regno >= i386_num_regs); |
0a30fbc4 DJ |
50 | } |
51 | ||
2ec06d2e DJ |
52 | static int |
53 | i386_cannot_fetch_register (int regno) | |
0a30fbc4 | 54 | { |
2ec06d2e | 55 | return (regno >= i386_num_regs); |
0a30fbc4 | 56 | } |
58caa3dc DJ |
57 | |
58 | ||
59 | #ifdef HAVE_LINUX_REGSETS | |
60 | #include <sys/procfs.h> | |
61 | #include <sys/ptrace.h> | |
62 | ||
63 | static void | |
64 | i386_fill_gregset (void *buf) | |
65 | { | |
66 | int i; | |
67 | ||
2ec06d2e DJ |
68 | for (i = 0; i < i386_num_regs; i++) |
69 | collect_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
70 | |
71 | collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
72 | } | |
73 | ||
74 | static void | |
0d62e5e8 | 75 | i386_store_gregset (const void *buf) |
58caa3dc DJ |
76 | { |
77 | int i; | |
78 | ||
2ec06d2e DJ |
79 | for (i = 0; i < i386_num_regs; i++) |
80 | supply_register (i, ((char *) buf) + i386_regmap[i]); | |
58caa3dc DJ |
81 | |
82 | supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
83 | } | |
84 | ||
85 | static void | |
86 | i386_fill_fpregset (void *buf) | |
87 | { | |
88 | i387_cache_to_fsave (buf); | |
89 | } | |
90 | ||
91 | static void | |
0d62e5e8 | 92 | i386_store_fpregset (const void *buf) |
58caa3dc DJ |
93 | { |
94 | i387_fsave_to_cache (buf); | |
95 | } | |
96 | ||
97 | static void | |
98 | i386_fill_fpxregset (void *buf) | |
99 | { | |
100 | i387_cache_to_fxsave (buf); | |
101 | } | |
102 | ||
103 | static void | |
0d62e5e8 | 104 | i386_store_fpxregset (const void *buf) |
58caa3dc DJ |
105 | { |
106 | i387_fxsave_to_cache (buf); | |
107 | } | |
108 | ||
109 | ||
110 | struct regset_info target_regsets[] = { | |
111 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), | |
0d62e5e8 | 112 | GENERAL_REGS, |
58caa3dc DJ |
113 | i386_fill_gregset, i386_store_gregset }, |
114 | #ifdef HAVE_PTRACE_GETFPXREGS | |
115 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), | |
0d62e5e8 | 116 | EXTENDED_REGS, |
58caa3dc DJ |
117 | i386_fill_fpxregset, i386_store_fpxregset }, |
118 | #endif | |
119 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), | |
0d62e5e8 | 120 | FP_REGS, |
58caa3dc | 121 | i386_fill_fpregset, i386_store_fpregset }, |
0d62e5e8 | 122 | { 0, 0, -1, -1, NULL, NULL } |
58caa3dc DJ |
123 | }; |
124 | ||
125 | #endif /* HAVE_LINUX_REGSETS */ | |
126 | ||
611cb4a5 DJ |
127 | static const char i386_breakpoint[] = { 0xCC }; |
128 | #define i386_breakpoint_len 1 | |
129 | ||
0d62e5e8 DJ |
130 | extern int debug_threads; |
131 | ||
611cb4a5 | 132 | static CORE_ADDR |
0d62e5e8 | 133 | i386_get_pc () |
611cb4a5 DJ |
134 | { |
135 | unsigned long pc; | |
136 | ||
611cb4a5 | 137 | collect_register_by_name ("eip", &pc); |
0d62e5e8 DJ |
138 | |
139 | if (debug_threads) | |
140 | fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); | |
141 | return pc; | |
611cb4a5 DJ |
142 | } |
143 | ||
144 | static void | |
145 | i386_set_pc (CORE_ADDR newpc) | |
146 | { | |
0d62e5e8 DJ |
147 | if (debug_threads) |
148 | fprintf (stderr, "set pc to %08lx\n", (long) newpc); | |
611cb4a5 | 149 | supply_register_by_name ("eip", &newpc); |
0d62e5e8 DJ |
150 | } |
151 | ||
152 | static int | |
153 | i386_breakpoint_at (CORE_ADDR pc) | |
154 | { | |
155 | unsigned char c; | |
156 | ||
157 | read_inferior_memory (pc, &c, 1); | |
158 | if (c == 0xCC) | |
159 | return 1; | |
611cb4a5 | 160 | |
0d62e5e8 | 161 | return 0; |
611cb4a5 DJ |
162 | } |
163 | ||
2ec06d2e DJ |
164 | struct linux_target_ops the_low_target = { |
165 | i386_num_regs, | |
166 | i386_regmap, | |
167 | i386_cannot_fetch_register, | |
168 | i386_cannot_store_register, | |
0d62e5e8 | 169 | i386_get_pc, |
611cb4a5 DJ |
170 | i386_set_pc, |
171 | i386_breakpoint, | |
172 | i386_breakpoint_len, | |
0d62e5e8 DJ |
173 | NULL, |
174 | 1, | |
175 | i386_breakpoint_at, | |
2ec06d2e | 176 | }; |