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
|
/* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 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 <sys/ptrace.h>
#include "gdb_proc_service.h"
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
#define mips_num_regs 90
#include <asm/ptrace.h>
/* Return the ptrace ``address'' of register REGNO. */
/* Matches mips_generic32_regs */
static int mips_regmap[] = {
0, 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,
-1, MMLO, MMHI, BADVADDR, CAUSE, PC,
FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3,
FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7,
FPR_BASE + 8, FPR_BASE + 8, FPR_BASE + 10, FPR_BASE + 11,
FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,
FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,
FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,
FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,
FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
FPC_CSR, FPC_EIR,
-1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
};
/* From mips-linux-nat.c. */
/* Pseudo registers can not be read. ptrace does not provide a way to
read (or set) PS_REGNUM, and there's no point in reading or setting
ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via
ptrace(). */
static int
mips_cannot_fetch_register (int regno)
{
if (mips_regmap[regno] == -1)
return 1;
if (find_regno ("zero") == regno)
return 1;
return 0;
}
static int
mips_cannot_store_register (int regno)
{
if (mips_regmap[regno] == -1)
return 1;
if (find_regno ("zero") == regno)
return 1;
if (find_regno ("cause") == regno)
return 1;
if (find_regno ("bad") == regno)
return 1;
if (find_regno ("fir") == regno)
return 1;
return 0;
}
static CORE_ADDR
mips_get_pc ()
{
unsigned long pc;
collect_register_by_name ("pc", &pc);
return pc;
}
static void
mips_set_pc (CORE_ADDR pc)
{
unsigned long newpc = pc;
supply_register_by_name ("pc", &newpc);
}
/* Correct in either endianness. */
static const unsigned long mips_breakpoint = 0x0005000d;
#define mips_breakpoint_len 4
/* We only place breakpoints in empty marker functions, and thread locking
is outside of the function. So rather than importing software single-step,
we can just run until exit. */
static CORE_ADDR
mips_reinsert_addr ()
{
unsigned long pc;
collect_register_by_name ("ra", &pc);
return pc;
}
static int
mips_breakpoint_at (CORE_ADDR where)
{
unsigned long insn;
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
if (insn == mips_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return 0;
}
/* 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;
}
struct linux_target_ops the_low_target = {
mips_num_regs,
mips_regmap,
mips_cannot_fetch_register,
mips_cannot_store_register,
mips_get_pc,
mips_set_pc,
(const unsigned char *) &mips_breakpoint,
mips_breakpoint_len,
mips_reinsert_addr,
0,
mips_breakpoint_at,
};
|
