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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
/* Native-dependent code for GNU/Linux on MIPS processors.
Copyright (C) 2001, 2002, 2003, 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 "defs.h"
#include "inferior.h"
#include "mips-tdep.h"
#include "target.h"
#include "linux-nat.h"
#include "mips-linux-tdep.h"
#include "gdb_proc_service.h"
#include <sys/ptrace.h>
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
we'll clear this and use PTRACE_PEEKUSER instead. */
static int have_ptrace_regsets = 1;
/* Saved function pointers to fetch and store a single register using
PTRACE_PEEKUSER and PTRACE_POKEUSER. */
void (*super_fetch_registers) (int);
void (*super_store_registers) (int);
/* Pseudo registers can not be read. ptrace does not provide a way to
read (or set) MIPS_PS_REGNUM, and there's no point in reading or
setting MIPS_ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or
FCRIR via ptrace(). */
int
mips_linux_cannot_fetch_register (int regno)
{
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
return 0;
else if (regno >= mips_regnum (current_gdbarch)->fp0
&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
return 0;
else if (regno == mips_regnum (current_gdbarch)->lo
|| regno == mips_regnum (current_gdbarch)->hi
|| regno == mips_regnum (current_gdbarch)->badvaddr
|| regno == mips_regnum (current_gdbarch)->cause
|| regno == mips_regnum (current_gdbarch)->pc
|| regno == mips_regnum (current_gdbarch)->fp_control_status
|| regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
return 0;
else
return 1;
}
int
mips_linux_cannot_store_register (int regno)
{
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
return 0;
else if (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 32)
return 0;
else if (regno == mips_regnum (current_gdbarch)->lo
|| regno == mips_regnum (current_gdbarch)->hi
|| regno == mips_regnum (current_gdbarch)->pc
|| regno == mips_regnum (current_gdbarch)->fp_control_status)
return 0;
else
return 1;
}
/* Fetch the thread-local storage pointer for libthread_db. */
ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
return PS_ERR;
/* IDX is the bias from the thread pointer to the beginning of the
thread descriptor. It has to be subtracted due to implementation
quirks in libthread_db. */
*base = (void *) ((char *)*base - idx);
return PS_OK;
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using PTRACE_GETREGS et al. */
static void
mips64_linux_regsets_fetch_registers (int regno)
{
int is_fp;
int tid;
if (regno >= mips_regnum (current_gdbarch)->fp0
&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
is_fp = 1;
else
is_fp = 0;
tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
tid = ptid_get_pid (inferior_ptid);
if (regno == -1 || !is_fp)
{
mips64_elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
{
if (errno == EIO)
{
have_ptrace_regsets = 0;
return;
}
perror_with_name (_("Couldn't get registers"));
}
mips64_supply_gregset (®s);
}
if (regno == -1 || is_fp)
{
mips64_elf_fpregset_t fp_regs;
if (ptrace (PTRACE_GETFPREGS, tid, 0L,
(PTRACE_TYPE_ARG3) &fp_regs) == -1)
{
if (errno == EIO)
{
have_ptrace_regsets = 0;
return;
}
perror_with_name (_("Couldn't get FP registers"));
}
mips64_supply_fpregset (&fp_regs);
}
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using PTRACE_SETREGS et al. */
static void
mips64_linux_regsets_store_registers (int regno)
{
int is_fp;
int tid;
if (regno >= mips_regnum (current_gdbarch)->fp0
&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
is_fp = 1;
else
is_fp = 0;
tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
tid = ptid_get_pid (inferior_ptid);
if (regno == -1 || !is_fp)
{
mips64_elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't get registers"));
mips64_fill_gregset (®s, regno);
if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't set registers"));
}
if (regno == -1 || is_fp)
{
mips64_elf_fpregset_t fp_regs;
if (ptrace (PTRACE_GETFPREGS, tid, 0L,
(PTRACE_TYPE_ARG3) &fp_regs) == -1)
perror_with_name (_("Couldn't get FP registers"));
mips64_fill_fpregset (&fp_regs, regno);
if (ptrace (PTRACE_SETFPREGS, tid, 0L,
(PTRACE_TYPE_ARG3) &fp_regs) == -1)
perror_with_name (_("Couldn't set FP registers"));
}
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using any working method. */
static void
mips64_linux_fetch_registers (int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
mips64_linux_regsets_fetch_registers (regnum);
/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
back to PTRACE_PEEKUSER. */
if (!have_ptrace_regsets)
super_fetch_registers (regnum);
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using any working method. */
static void
mips64_linux_store_registers (int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
mips64_linux_regsets_store_registers (regnum);
/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
back to PTRACE_PEEKUSER. */
if (!have_ptrace_regsets)
super_store_registers (regnum);
}
void _initialize_mips_linux_nat (void);
void
_initialize_mips_linux_nat (void)
{
struct target_ops *t = linux_target ();
super_fetch_registers = t->to_fetch_registers;
super_store_registers = t->to_store_registers;
t->to_fetch_registers = mips64_linux_fetch_registers;
t->to_store_registers = mips64_linux_store_registers;
add_target (t);
}
|
