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
|
/* Internal interfaces for the NetBSD code.
Copyright (C) 2006-2020 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 "gdbsupport/common-defs.h"
#include "nat/netbsd-nat.h"
#include "gdbsupport/common-debug.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <cstring>
#include "gdbsupport/function-view.h"
namespace netbsd_nat
{
/* See netbsd-nat.h. */
const char *
pid_to_exec_file (pid_t pid)
{
static char buf[PATH_MAX];
int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_PATHNAME};
size_t buflen = sizeof (buf);
if (::sysctl (mib, ARRAY_SIZE (mib), buf, &buflen, NULL, 0) != 0)
return NULL;
return buf;
}
/* Generic thread (LWP) lister within a specified PID. The CALLBACK
parameters is a C++ function that is called for each detected thread.
When the CALLBACK function returns true, the iteration is interrupted.
This function assumes internally that the queried process is stopped
and the number of threads does not change between two sysctl () calls. */
static bool
netbsd_thread_lister (const pid_t pid,
gdb::function_view<bool (const struct kinfo_lwp *)>
callback)
{
int mib[5] = {CTL_KERN, KERN_LWP, pid, sizeof (struct kinfo_lwp), 0};
size_t size;
if (sysctl (mib, ARRAY_SIZE (mib), NULL, &size, NULL, 0) == -1 || size == 0)
perror_with_name (("sysctl"));
mib[4] = size / sizeof (size_t);
gdb::unique_xmalloc_ptr<struct kinfo_lwp[]> kl
((struct kinfo_lwp *) xcalloc (size, 1));
if (sysctl (mib, ARRAY_SIZE (mib), kl.get (), &size, NULL, 0) == -1
|| size == 0)
perror_with_name (("sysctl"));
for (size_t i = 0; i < size / sizeof (struct kinfo_lwp); i++)
{
struct kinfo_lwp *l = &kl[i];
/* Return true if the specified thread is alive. */
auto lwp_alive
= [] (struct kinfo_lwp *lwp)
{
switch (lwp->l_stat)
{
case LSSLEEP:
case LSRUN:
case LSONPROC:
case LSSTOP:
case LSSUSPENDED:
return true;
default:
return false;
}
};
/* Ignore embryonic or demised threads. */
if (!lwp_alive (l))
continue;
if (callback (l))
return true;
}
return false;
}
/* See netbsd-nat.h. */
bool
thread_alive (ptid_t ptid)
{
pid_t pid = ptid.pid ();
lwpid_t lwp = ptid.lwp ();
auto fn
= [=] (const struct kinfo_lwp *kl)
{
return kl->l_lid == lwp;
};
return netbsd_thread_lister (pid, fn);
}
/* See netbsd-nat.h. */
const char *
thread_name (ptid_t ptid)
{
pid_t pid = ptid.pid ();
lwpid_t lwp = ptid.lwp ();
static char buf[KI_LNAMELEN] = {};
auto fn
= [=] (const struct kinfo_lwp *kl)
{
if (kl->l_lid == lwp)
{
xsnprintf (buf, sizeof buf, "%s", kl->l_name);
return true;
}
return false;
};
if (netbsd_thread_lister (pid, fn))
return buf;
else
return NULL;
}
/* See netbsd-nat.h. */
void
for_each_thread (pid_t pid, gdb::function_view<void (ptid_t)> callback)
{
auto fn
= [=, &callback] (const struct kinfo_lwp *kl)
{
ptid_t ptid = ptid_t (pid, kl->l_lid, 0);
callback (ptid);
return false;
};
netbsd_thread_lister (pid, fn);
}
/* See netbsd-nat.h. */
void
enable_proc_events (pid_t pid)
{
int events;
if (ptrace (PT_GET_EVENT_MASK, pid, &events, sizeof (events)) == -1)
perror_with_name (("ptrace"));
events |= PTRACE_LWP_CREATE;
events |= PTRACE_LWP_EXIT;
if (ptrace (PT_SET_EVENT_MASK, pid, &events, sizeof (events)) == -1)
perror_with_name (("ptrace"));
}
/* See netbsd-nat.h. */
int
qxfer_siginfo (pid_t pid, const char *annex, unsigned char *readbuf,
unsigned const char *writebuf, CORE_ADDR offset, int len)
{
ptrace_siginfo_t psi;
if (offset > sizeof (siginfo_t))
return -1;
if (ptrace (PT_GET_SIGINFO, pid, &psi, sizeof (psi)) == -1)
return -1;
if (offset + len > sizeof (siginfo_t))
len = sizeof (siginfo_t) - offset;
if (readbuf != NULL)
memcpy (readbuf, ((gdb_byte *) &psi.psi_siginfo) + offset, len);
else
{
memcpy (((gdb_byte *) &psi.psi_siginfo) + offset, writebuf, len);
if (ptrace (PT_SET_SIGINFO, pid, &psi, sizeof (psi)) == -1)
return -1;
}
return len;
}
}
|
