1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* GNU/Linux/i386 specific low level interface, for the remote server for GDB.
Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "server.h"
#include "linux-low.h"
#include "i387-fp.h"
#include "gdb_proc_service.h"
#include <sys/ptrace.h>
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
/* This module only supports access to the general purpose registers. */
#define i386_num_regs 16
/* This stuff comes from i386-linux-nat.c. */
/* Mapping between the general-purpose registers in `struct user'
format and GDB's register array layout. */
static int i386_regmap[] =
{
EAX * 4, ECX * 4, EDX * 4, EBX * 4,
UESP * 4, EBP * 4, ESI * 4, EDI * 4,
EIP * 4, EFL * 4, CS * 4, SS * 4,
DS * 4, ES * 4, FS * 4, GS * 4
};
/* Called by libthread_db. */
ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
unsigned int desc[4];
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
(void *) idx, (unsigned long) &desc) < 0)
return PS_ERR;
*(int *)base = desc[1];
return PS_OK;
}
static int
i386_cannot_store_register (int regno)
{
return (regno >= i386_num_regs);
}
static int
i386_cannot_fetch_register (int regno)
{
return (regno >= i386_num_regs);
}
#ifdef HAVE_PTRACE_GETREGS
#include <sys/procfs.h>
#include <sys/ptrace.h>
static void
i386_fill_gregset (void *buf)
{
int i;
for (i = 0; i < i386_num_regs; i++)
collect_register (i, ((char *) buf) + i386_regmap[i]);
collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
}
static void
i386_store_gregset (const void *buf)
{
int i;
for (i = 0; i < i386_num_regs; i++)
supply_register (i, ((char *) buf) + i386_regmap[i]);
supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
}
static void
i386_fill_fpregset (void *buf)
{
i387_cache_to_fsave (buf);
}
static void
i386_store_fpregset (const void *buf)
{
i387_fsave_to_cache (buf);
}
static void
i386_fill_fpxregset (void *buf)
{
i387_cache_to_fxsave (buf);
}
static void
i386_store_fpxregset (const void *buf)
{
i387_fxsave_to_cache (buf);
}
#endif /* HAVE_PTRACE_GETREGS */
struct regset_info target_regsets[] = {
#ifdef HAVE_PTRACE_GETREGS
{ PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
GENERAL_REGS,
i386_fill_gregset, i386_store_gregset },
# ifdef HAVE_PTRACE_GETFPXREGS
{ PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
EXTENDED_REGS,
i386_fill_fpxregset, i386_store_fpxregset },
# endif
{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
FP_REGS,
i386_fill_fpregset, i386_store_fpregset },
#endif /* HAVE_PTRACE_GETREGS */
{ 0, 0, -1, -1, NULL, NULL }
};
static const unsigned char i386_breakpoint[] = { 0xCC };
#define i386_breakpoint_len 1
extern int debug_threads;
static CORE_ADDR
i386_get_pc ()
{
unsigned long pc;
collect_register_by_name ("eip", &pc);
if (debug_threads)
fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
return pc;
}
static void
i386_set_pc (CORE_ADDR newpc)
{
if (debug_threads)
fprintf (stderr, "set pc to %08lx\n", (long) newpc);
supply_register_by_name ("eip", &newpc);
}
static int
i386_breakpoint_at (CORE_ADDR pc)
{
unsigned char c;
read_inferior_memory (pc, &c, 1);
if (c == 0xCC)
return 1;
return 0;
}
struct linux_target_ops the_low_target = {
i386_num_regs,
i386_regmap,
i386_cannot_fetch_register,
i386_cannot_store_register,
i386_get_pc,
i386_set_pc,
i386_breakpoint,
i386_breakpoint_len,
NULL,
1,
i386_breakpoint_at,
};
|
