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
|
/* Generic GNU/Linux target using traditional ptrace register access.
Copyright (C) 1988-2019 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "linux-nat-trad.h"
#include "nat/gdb_ptrace.h"
#include "inf-ptrace.h"
#include "gdbarch.h"
/* Fetch register REGNUM from the inferior. */
void
linux_nat_trad_target::fetch_register (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR addr;
gdb_byte *buf;
size_t size;
pid_t pid;
int i;
/* This isn't really an address, but ptrace thinks of it as one. */
addr = register_u_offset (gdbarch, regnum, 0);
if (addr == (CORE_ADDR)-1
|| gdbarch_cannot_fetch_register (gdbarch, regnum))
{
regcache->raw_supply (regnum, NULL);
return;
}
pid = get_ptrace_pid (regcache->ptid ());
size = register_size (gdbarch, regnum);
buf = (gdb_byte *) alloca (size);
/* Read the register contents from the inferior a chunk at a time. */
for (i = 0; i < size; i += sizeof (PTRACE_TYPE_RET))
{
size_t chunk = std::min (sizeof (PTRACE_TYPE_RET), size - i);
PTRACE_TYPE_RET val;
errno = 0;
val = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3) (uintptr_t) addr, 0);
if (errno != 0)
error (_("Couldn't read register %s (#%d): %s."),
gdbarch_register_name (gdbarch, regnum),
regnum, safe_strerror (errno));
store_unsigned_integer (buf + i, chunk, byte_order, val);
addr += sizeof (PTRACE_TYPE_RET);
}
regcache->raw_supply (regnum, buf);
}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
void
linux_nat_trad_target::fetch_registers (struct regcache *regcache, int regnum)
{
if (regnum == -1)
for (regnum = 0;
regnum < gdbarch_num_regs (regcache->arch ());
regnum++)
fetch_register (regcache, regnum);
else
fetch_register (regcache, regnum);
}
/* Store register REGNUM into the inferior. */
void
linux_nat_trad_target::store_register (const struct regcache *regcache,
int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR addr;
size_t size;
gdb_byte *buf;
pid_t pid;
int i;
/* This isn't really an address, but ptrace thinks of it as one. */
addr = register_u_offset (gdbarch, regnum, 1);
if (addr == (CORE_ADDR)-1
|| gdbarch_cannot_store_register (gdbarch, regnum))
return;
pid = get_ptrace_pid (regcache->ptid ());
size = register_size (gdbarch, regnum);
buf = (gdb_byte *) alloca (size);
/* Write the register contents into the inferior a chunk at a time. */
regcache->raw_collect (regnum, buf);
for (i = 0; i < size; i += sizeof (PTRACE_TYPE_RET))
{
size_t chunk = std::min (sizeof (PTRACE_TYPE_RET), size - i);
PTRACE_TYPE_RET val;
val = extract_unsigned_integer (buf + i, chunk, byte_order);
errno = 0;
ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) (uintptr_t) addr, val);
if (errno != 0)
error (_("Couldn't write register %s (#%d): %s."),
gdbarch_register_name (gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
}
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
void
linux_nat_trad_target::store_registers (struct regcache *regcache, int regnum)
{
if (regnum == -1)
for (regnum = 0;
regnum < gdbarch_num_regs (regcache->arch ());
regnum++)
store_register (regcache, regnum);
else
store_register (regcache, regnum);
}
|
