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
|
/* Copyright (C) 2021 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 "gcore-elf.h"
#include "elf-bfd.h"
#include "target.h"
#include "regcache.h"
#include "gdbarch.h"
#include "gdbthread.h"
#include "inferior.h"
#include "regset.h"
#include "gdbsupport/tdesc.h"
/* Structure for passing information from GCORE_COLLECT_THREAD_REGISTERS
via an iterator to GCORE_COLLECT_REGSET_SECTION_CB. */
struct gcore_elf_collect_regset_section_cb_data
{
gcore_elf_collect_regset_section_cb_data
(struct gdbarch *gdbarch, const struct regcache *regcache,
bfd *obfd, ptid_t ptid, gdb_signal stop_signal,
gdb::unique_xmalloc_ptr<char> *note_data, int *note_size)
: gdbarch (gdbarch), regcache (regcache), obfd (obfd),
note_data (note_data), note_size (note_size),
stop_signal (stop_signal)
{
/* The LWP is often not available for bare metal target, in which case
use the tid instead. */
if (ptid.lwp_p ())
lwp = ptid.lwp ();
else
lwp = ptid.tid ();
}
struct gdbarch *gdbarch;
const struct regcache *regcache;
bfd *obfd;
gdb::unique_xmalloc_ptr<char> *note_data;
int *note_size;
unsigned long lwp;
enum gdb_signal stop_signal;
bool abort_iteration = false;
};
/* Callback for ITERATE_OVER_REGSET_SECTIONS that records a single
regset in the core file note section. */
static void
gcore_elf_collect_regset_section_cb (const char *sect_name,
int supply_size, int collect_size,
const struct regset *regset,
const char *human_name, void *cb_data)
{
struct gcore_elf_collect_regset_section_cb_data *data
= (struct gcore_elf_collect_regset_section_cb_data *) cb_data;
bool variable_size_section = (regset != nullptr
&& regset->flags & REGSET_VARIABLE_SIZE);
gdb_assert (variable_size_section || supply_size == collect_size);
if (data->abort_iteration)
return;
gdb_assert (regset != nullptr && regset->collect_regset != nullptr);
/* This is intentionally zero-initialized by using std::vector, so
that any padding bytes in the core file will show as 0. */
std::vector<gdb_byte> buf (collect_size);
regset->collect_regset (regset, data->regcache, -1, buf.data (),
collect_size);
/* PRSTATUS still needs to be treated specially. */
if (strcmp (sect_name, ".reg") == 0)
data->note_data->reset (elfcore_write_prstatus
(data->obfd, data->note_data->release (),
data->note_size, data->lwp,
gdb_signal_to_host (data->stop_signal),
buf.data ()));
else
data->note_data->reset (elfcore_write_register_note
(data->obfd, data->note_data->release (),
data->note_size, sect_name, buf.data (),
collect_size));
if (*data->note_data == nullptr)
data->abort_iteration = true;
}
/* Records the register state of thread PTID out of REGCACHE into the note
buffer represented by *NOTE_DATA and NOTE_SIZE. OBFD is the bfd into
which the core file is being created, and STOP_SIGNAL is the signal that
cause thread PTID to stop. */
static void
gcore_elf_collect_thread_registers
(const struct regcache *regcache, ptid_t ptid, bfd *obfd,
gdb::unique_xmalloc_ptr<char> *note_data, int *note_size,
enum gdb_signal stop_signal)
{
struct gdbarch *gdbarch = regcache->arch ();
gcore_elf_collect_regset_section_cb_data data (gdbarch, regcache, obfd,
ptid, stop_signal,
note_data, note_size);
gdbarch_iterate_over_regset_sections
(gdbarch, gcore_elf_collect_regset_section_cb, &data, regcache);
}
/* See gcore-elf.h. */
void
gcore_elf_build_thread_register_notes
(struct gdbarch *gdbarch, struct thread_info *info, gdb_signal stop_signal,
bfd *obfd, gdb::unique_xmalloc_ptr<char> *note_data, int *note_size)
{
struct regcache *regcache
= get_thread_arch_regcache (info->inf->process_target (),
info->ptid, gdbarch);
target_fetch_registers (regcache, -1);
gcore_elf_collect_thread_registers (regcache, info->ptid, obfd,
note_data, note_size, stop_signal);
}
/* See gcore-elf.h. */
void
gcore_elf_make_tdesc_note (bfd *obfd,
gdb::unique_xmalloc_ptr<char> *note_data,
int *note_size)
{
/* Append the target description to the core file. */
const struct target_desc *tdesc = gdbarch_target_desc (target_gdbarch ());
const char *tdesc_xml
= tdesc == nullptr ? nullptr : tdesc_get_features_xml (tdesc);
if (tdesc_xml != nullptr && *tdesc_xml != '\0')
{
/* Skip the leading '@'. */
if (*tdesc_xml == '@')
++tdesc_xml;
/* Include the null terminator in the length. */
size_t tdesc_len = strlen (tdesc_xml) + 1;
/* Now add the target description into the core file. */
note_data->reset (elfcore_write_register_note (obfd,
note_data->release (),
note_size,
".gdb-tdesc", tdesc_xml,
tdesc_len));
}
}
|
