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
|
/* Copyright (C) 2009-2021 Free Software Foundation, Inc.
Contributed by ARM Ltd.
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 "gdbsupport/common-defs.h"
#include "gdbsupport/break-common.h"
#include "nat/linux-nat.h"
#include "nat/aarch64-linux-hw-point.h"
#include "nat/aarch64-linux.h"
#include "elf/common.h"
#include "nat/gdb_ptrace.h"
#include <asm/ptrace.h>
#include <sys/uio.h>
/* Called when resuming a thread LWP.
The hardware debug registers are updated when there is any change. */
void
aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
{
struct arch_lwp_info *info = lwp_arch_private_info (lwp);
/* NULL means this is the main thread still going through the shell,
or, no watchpoint has been set yet. In that case, there's
nothing to do. */
if (info == NULL)
return;
if (DR_HAS_CHANGED (info->dr_changed_bp)
|| DR_HAS_CHANGED (info->dr_changed_wp))
{
ptid_t ptid = ptid_of_lwp (lwp);
int tid = ptid.lwp ();
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (ptid.pid ());
if (show_debug_regs)
debug_printf ("prepare_to_resume thread %d\n", tid);
/* Watchpoints. */
if (DR_HAS_CHANGED (info->dr_changed_wp))
{
aarch64_linux_set_debug_regs (state, tid, 1);
DR_CLEAR_CHANGED (info->dr_changed_wp);
}
/* Breakpoints. */
if (DR_HAS_CHANGED (info->dr_changed_bp))
{
aarch64_linux_set_debug_regs (state, tid, 0);
DR_CLEAR_CHANGED (info->dr_changed_bp);
}
}
}
/* Function to call when a new thread is detected. */
void
aarch64_linux_new_thread (struct lwp_info *lwp)
{
ptid_t ptid = ptid_of_lwp (lwp);
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (ptid.pid ());
struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
/* If there are hardware breakpoints/watchpoints in the process then mark that
all the hardware breakpoint/watchpoint register pairs for this thread need
to be initialized (with data from aarch_process_info.debug_reg_state). */
if (aarch64_linux_any_set_debug_regs_state (state, false))
DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
if (aarch64_linux_any_set_debug_regs_state (state, true))
DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
lwp_set_arch_private_info (lwp, info);
}
/* See nat/aarch64-linux.h. */
void
aarch64_linux_delete_thread (struct arch_lwp_info *arch_lwp)
{
xfree (arch_lwp);
}
/* Convert native siginfo FROM to the siginfo in the layout of the
inferior's architecture TO. */
void
aarch64_compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->cpt_si_timerid = from->si_timerid;
to->cpt_si_overrun = from->si_overrun;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else if (to->si_code == SI_USER)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
}
else if (to->si_code < 0)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_status = from->si_status;
to->cpt_si_utime = from->si_utime;
to->cpt_si_stime = from->si_stime;
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->cpt_si_addr = (intptr_t) from->si_addr;
break;
case SIGPOLL:
to->cpt_si_band = from->si_band;
to->cpt_si_fd = from->si_fd;
break;
default:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
break;
}
}
}
/* Convert inferior's architecture siginfo FROM to native siginfo TO. */
void
aarch64_siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->si_timerid = from->cpt_si_timerid;
to->si_overrun = from->cpt_si_overrun;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else if (to->si_code == SI_USER)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
}
if (to->si_code < 0)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_status = from->cpt_si_status;
to->si_utime = from->cpt_si_utime;
to->si_stime = from->cpt_si_stime;
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
break;
case SIGPOLL:
to->si_band = from->cpt_si_band;
to->si_fd = from->cpt_si_fd;
break;
default:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
break;
}
}
}
/* Called by libthread_db. Returns a pointer to the thread local
storage (or its descriptor). */
ps_err_e
aarch64_ps_get_thread_area (struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base,
int is_64bit_p)
{
struct iovec iovec;
uint64_t reg64;
uint32_t reg32;
if (is_64bit_p)
{
iovec.iov_base = ®64;
iovec.iov_len = sizeof (reg64);
}
else
{
iovec.iov_base = ®32;
iovec.iov_len = sizeof (reg32);
}
if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 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. */
if (is_64bit_p)
*base = (void *) (reg64 - idx);
else
*base = (void *) (uintptr_t) (reg32 - idx);
return PS_OK;
}
|
