9 #include <linux/kernel.h>
16 #include "linux/string.h"
20 * Include definition of find_vdso_map() also used in perf-read-vdso.c for
21 * building perf-read-vdso32 and perf-read-vdsox32.
23 #include "find-vdso-map.c"
25 #define VDSO__TEMP_FILE_NAME "/tmp/perf-vdso.so-XXXXXX"
30 char temp_file_name[sizeof(VDSO__TEMP_FILE_NAME)];
32 const char *read_prog;
36 struct vdso_file vdso;
37 #if BITS_PER_LONG == 64
38 struct vdso_file vdso32;
39 struct vdso_file vdsox32;
43 static struct vdso_info *vdso_info__new(void)
45 static const struct vdso_info vdso_info_init = {
47 .temp_file_name = VDSO__TEMP_FILE_NAME,
48 .dso_name = DSO__NAME_VDSO,
50 #if BITS_PER_LONG == 64
52 .temp_file_name = VDSO__TEMP_FILE_NAME,
53 .dso_name = DSO__NAME_VDSO32,
54 .read_prog = "perf-read-vdso32",
57 .temp_file_name = VDSO__TEMP_FILE_NAME,
58 .dso_name = DSO__NAME_VDSOX32,
59 .read_prog = "perf-read-vdsox32",
64 return memdup(&vdso_info_init, sizeof(vdso_info_init));
67 static char *get_file(struct vdso_file *vdso_file)
76 return vdso_file->temp_file_name;
78 if (vdso_file->error || find_vdso_map(&start, &end))
83 buf = memdup(start, size);
87 fd = mkstemp(vdso_file->temp_file_name);
91 if (size == (size_t) write(fd, buf, size))
92 vdso = vdso_file->temp_file_name;
99 vdso_file->found = (vdso != NULL);
100 vdso_file->error = !vdso_file->found;
104 void machine__exit_vdso(struct machine *machine)
106 struct vdso_info *vdso_info = machine->vdso_info;
111 if (vdso_info->vdso.found)
112 unlink(vdso_info->vdso.temp_file_name);
113 #if BITS_PER_LONG == 64
114 if (vdso_info->vdso32.found)
115 unlink(vdso_info->vdso32.temp_file_name);
116 if (vdso_info->vdsox32.found)
117 unlink(vdso_info->vdsox32.temp_file_name);
120 zfree(&machine->vdso_info);
123 static struct dso *__machine__addnew_vdso(struct machine *machine, const char *short_name,
124 const char *long_name)
128 dso = dso__new(short_name);
130 __dsos__add(&machine->dsos, dso);
131 dso__set_long_name(dso, long_name, false);
137 #if BITS_PER_LONG == 64
139 static enum dso_type machine__thread_dso_type(struct machine *machine,
140 struct thread *thread)
142 enum dso_type dso_type = DSO__TYPE_UNKNOWN;
146 map = map_groups__first(thread->mg, MAP__FUNCTION);
147 for (; map ; map = map_groups__next(map)) {
149 if (!dso || dso->long_name[0] != '/')
151 dso_type = dso__type(dso, machine);
152 if (dso_type != DSO__TYPE_UNKNOWN)
159 static int vdso__do_copy_compat(FILE *f, int fd)
165 count = fread(buf, 1, sizeof(buf), f);
170 if (count && writen(fd, buf, count) != (ssize_t)count)
177 static int vdso__copy_compat(const char *prog, int fd)
182 f = popen(prog, "r");
186 err = vdso__do_copy_compat(f, fd);
194 static int vdso__create_compat_file(const char *prog, char *temp_name)
198 fd = mkstemp(temp_name);
202 err = vdso__copy_compat(prog, fd);
210 static const char *vdso__get_compat_file(struct vdso_file *vdso_file)
214 if (vdso_file->found)
215 return vdso_file->temp_file_name;
217 if (vdso_file->error)
220 err = vdso__create_compat_file(vdso_file->read_prog,
221 vdso_file->temp_file_name);
223 pr_err("%s failed, error %d\n", vdso_file->read_prog, err);
224 vdso_file->error = true;
228 vdso_file->found = true;
230 return vdso_file->temp_file_name;
233 static struct dso *__machine__findnew_compat(struct machine *machine,
234 struct vdso_file *vdso_file)
236 const char *file_name;
239 dso = __dsos__find(&machine->dsos, vdso_file->dso_name, true);
243 file_name = vdso__get_compat_file(vdso_file);
247 dso = __machine__addnew_vdso(machine, vdso_file->dso_name, file_name);
252 static int __machine__findnew_vdso_compat(struct machine *machine,
253 struct thread *thread,
254 struct vdso_info *vdso_info,
257 enum dso_type dso_type;
259 dso_type = machine__thread_dso_type(machine, thread);
261 #ifndef HAVE_PERF_READ_VDSO32
262 if (dso_type == DSO__TYPE_32BIT)
265 #ifndef HAVE_PERF_READ_VDSOX32
266 if (dso_type == DSO__TYPE_X32BIT)
271 case DSO__TYPE_32BIT:
272 *dso = __machine__findnew_compat(machine, &vdso_info->vdso32);
274 case DSO__TYPE_X32BIT:
275 *dso = __machine__findnew_compat(machine, &vdso_info->vdsox32);
277 case DSO__TYPE_UNKNOWN:
278 case DSO__TYPE_64BIT:
286 struct dso *machine__findnew_vdso(struct machine *machine,
287 struct thread *thread __maybe_unused)
289 struct vdso_info *vdso_info;
290 struct dso *dso = NULL;
292 pthread_rwlock_wrlock(&machine->dsos.lock);
293 if (!machine->vdso_info)
294 machine->vdso_info = vdso_info__new();
296 vdso_info = machine->vdso_info;
300 #if BITS_PER_LONG == 64
301 if (__machine__findnew_vdso_compat(machine, thread, vdso_info, &dso))
305 dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
309 file = get_file(&vdso_info->vdso);
311 dso = __machine__addnew_vdso(machine, DSO__NAME_VDSO, file);
316 pthread_rwlock_unlock(&machine->dsos.lock);
320 bool dso__is_vdso(struct dso *dso)
322 return !strcmp(dso->short_name, DSO__NAME_VDSO) ||
323 !strcmp(dso->short_name, DSO__NAME_VDSO32) ||
324 !strcmp(dso->short_name, DSO__NAME_VDSOX32);