mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Ian Rogers](/assets/img/avatar_default.png)
struct addr_location holds references to multiple reference counted objects. Add init/exit functions to make maintenance of those more consistent with the rest of the code and to try to avoid leaks. Modification of thread reference counts isn't included in this change. Committer notes: I needed to initialize result to sample->ip to make sure is set to something, fixing a compile time error, mostly keeping the previous logic as build_alloc_func_list() already does debugging/error prints about what went wrong if it takes the 'goto out'. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ali Saidi <alisaidi@amazon.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Brian Robbins <brianrob@linux.microsoft.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Fangrui Song <maskray@google.com> Cc: German Gomez <german.gomez@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ivan Babrou <ivan@cloudflare.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Miguel Ojeda <ojeda@kernel.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Steinar H. Gunderson <sesse@google.com> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Wenyu Liu <liuwenyu7@huawei.com> Cc: Will Deacon <will@kernel.org> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: Ye Xingchen <ye.xingchen@zte.com.cn> Cc: Yuan Can <yuancan@huawei.com> Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230608232823.4027869-7-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1024 lines
23 KiB
C
1024 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* build-id.c
|
|
*
|
|
* build-id support
|
|
*
|
|
* Copyright (C) 2009, 2010 Red Hat Inc.
|
|
* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
*/
|
|
#include "util.h" // lsdir(), mkdir_p(), rm_rf()
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include "util/copyfile.h"
|
|
#include "dso.h"
|
|
#include "build-id.h"
|
|
#include "event.h"
|
|
#include "namespaces.h"
|
|
#include "map.h"
|
|
#include "symbol.h"
|
|
#include "thread.h"
|
|
#include <linux/kernel.h>
|
|
#include "debug.h"
|
|
#include "session.h"
|
|
#include "tool.h"
|
|
#include "header.h"
|
|
#include "vdso.h"
|
|
#include "path.h"
|
|
#include "probe-file.h"
|
|
#include "strlist.h"
|
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT
|
|
#include <elfutils/debuginfod.h>
|
|
#endif
|
|
|
|
#include <linux/ctype.h>
|
|
#include <linux/zalloc.h>
|
|
#include <linux/string.h>
|
|
#include <asm/bug.h>
|
|
|
|
static bool no_buildid_cache;
|
|
|
|
int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct evsel *evsel __maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
struct addr_location al;
|
|
struct thread *thread = machine__findnew_thread(machine, sample->pid,
|
|
sample->tid);
|
|
|
|
if (thread == NULL) {
|
|
pr_err("problem processing %d event, skipping it.\n",
|
|
event->header.type);
|
|
return -1;
|
|
}
|
|
|
|
addr_location__init(&al);
|
|
if (thread__find_map(thread, sample->cpumode, sample->ip, &al))
|
|
map__dso(al.map)->hit = 1;
|
|
|
|
addr_location__exit(&al);
|
|
thread__put(thread);
|
|
return 0;
|
|
}
|
|
|
|
static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample
|
|
__maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
struct thread *thread = machine__findnew_thread(machine,
|
|
event->fork.pid,
|
|
event->fork.tid);
|
|
|
|
dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
|
|
event->fork.ppid, event->fork.ptid);
|
|
|
|
if (thread) {
|
|
machine__remove_thread(machine, thread);
|
|
thread__put(thread);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct perf_tool build_id__mark_dso_hit_ops = {
|
|
.sample = build_id__mark_dso_hit,
|
|
.mmap = perf_event__process_mmap,
|
|
.mmap2 = perf_event__process_mmap2,
|
|
.fork = perf_event__process_fork,
|
|
.exit = perf_event__exit_del_thread,
|
|
.attr = perf_event__process_attr,
|
|
.build_id = perf_event__process_build_id,
|
|
.ordered_events = true,
|
|
};
|
|
|
|
int build_id__sprintf(const struct build_id *build_id, char *bf)
|
|
{
|
|
char *bid = bf;
|
|
const u8 *raw = build_id->data;
|
|
size_t i;
|
|
|
|
bf[0] = 0x0;
|
|
|
|
for (i = 0; i < build_id->size; ++i) {
|
|
sprintf(bid, "%02x", *raw);
|
|
++raw;
|
|
bid += 2;
|
|
}
|
|
|
|
return (bid - bf) + 1;
|
|
}
|
|
|
|
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
|
|
{
|
|
char notes[PATH_MAX];
|
|
struct build_id bid;
|
|
int ret;
|
|
|
|
if (!root_dir)
|
|
root_dir = "";
|
|
|
|
scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
|
|
|
|
ret = sysfs__read_build_id(notes, &bid);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return build_id__sprintf(&bid, sbuild_id);
|
|
}
|
|
|
|
int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
|
|
{
|
|
struct build_id bid;
|
|
int ret;
|
|
|
|
ret = filename__read_build_id(pathname, &bid);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return build_id__sprintf(&bid, sbuild_id);
|
|
}
|
|
|
|
/* asnprintf consolidates asprintf and snprintf */
|
|
static int asnprintf(char **strp, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
if (!strp)
|
|
return -EINVAL;
|
|
|
|
va_start(ap, fmt);
|
|
if (*strp)
|
|
ret = vsnprintf(*strp, size, fmt, ap);
|
|
else
|
|
ret = vasprintf(strp, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
|
|
size_t size)
|
|
{
|
|
bool retry_old = true;
|
|
|
|
snprintf(bf, size, "%s/%s/%s/kallsyms",
|
|
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
|
|
retry:
|
|
if (!access(bf, F_OK))
|
|
return bf;
|
|
if (retry_old) {
|
|
/* Try old style kallsyms cache */
|
|
snprintf(bf, size, "%s/%s/%s",
|
|
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
|
|
retry_old = false;
|
|
goto retry;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
|
|
{
|
|
char *tmp = bf;
|
|
int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
|
|
sbuild_id, sbuild_id + 2);
|
|
if (ret < 0 || (tmp && size < (unsigned int)ret))
|
|
return NULL;
|
|
return bf;
|
|
}
|
|
|
|
/* The caller is responsible to free the returned buffer. */
|
|
char *build_id_cache__origname(const char *sbuild_id)
|
|
{
|
|
char *linkname;
|
|
char buf[PATH_MAX];
|
|
char *ret = NULL, *p;
|
|
size_t offs = 5; /* == strlen("../..") */
|
|
ssize_t len;
|
|
|
|
linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
if (!linkname)
|
|
return NULL;
|
|
|
|
len = readlink(linkname, buf, sizeof(buf) - 1);
|
|
if (len <= 0)
|
|
goto out;
|
|
buf[len] = '\0';
|
|
|
|
/* The link should be "../..<origpath>/<sbuild_id>" */
|
|
p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
|
|
if (p && (p > buf + offs)) {
|
|
*p = '\0';
|
|
if (buf[offs + 1] == '[')
|
|
offs++; /*
|
|
* This is a DSO name, like [kernel.kallsyms].
|
|
* Skip the first '/', since this is not the
|
|
* cache of a regular file.
|
|
*/
|
|
ret = strdup(buf + offs); /* Skip "../..[/]" */
|
|
}
|
|
out:
|
|
free(linkname);
|
|
return ret;
|
|
}
|
|
|
|
/* Check if the given build_id cache is valid on current running system */
|
|
static bool build_id_cache__valid_id(char *sbuild_id)
|
|
{
|
|
char real_sbuild_id[SBUILD_ID_SIZE] = "";
|
|
char *pathname;
|
|
int ret = 0;
|
|
bool result = false;
|
|
|
|
pathname = build_id_cache__origname(sbuild_id);
|
|
if (!pathname)
|
|
return false;
|
|
|
|
if (!strcmp(pathname, DSO__NAME_KALLSYMS))
|
|
ret = sysfs__sprintf_build_id("/", real_sbuild_id);
|
|
else if (pathname[0] == '/')
|
|
ret = filename__sprintf_build_id(pathname, real_sbuild_id);
|
|
else
|
|
ret = -EINVAL; /* Should we support other special DSO cache? */
|
|
if (ret >= 0)
|
|
result = (strcmp(sbuild_id, real_sbuild_id) == 0);
|
|
free(pathname);
|
|
|
|
return result;
|
|
}
|
|
|
|
static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
|
|
bool is_debug)
|
|
{
|
|
return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
|
|
"debug" : "elf"));
|
|
}
|
|
|
|
char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
|
|
bool is_debug, bool is_kallsyms)
|
|
{
|
|
bool is_vdso = dso__is_vdso((struct dso *)dso);
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
char *linkname;
|
|
bool alloc = (bf == NULL);
|
|
int ret;
|
|
|
|
if (!dso->has_build_id)
|
|
return NULL;
|
|
|
|
build_id__sprintf(&dso->bid, sbuild_id);
|
|
linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
if (!linkname)
|
|
return NULL;
|
|
|
|
/* Check if old style build_id cache */
|
|
if (is_regular_file(linkname))
|
|
ret = asnprintf(&bf, size, "%s", linkname);
|
|
else
|
|
ret = asnprintf(&bf, size, "%s/%s", linkname,
|
|
build_id_cache__basename(is_kallsyms, is_vdso,
|
|
is_debug));
|
|
if (ret < 0 || (!alloc && size < (unsigned int)ret))
|
|
bf = NULL;
|
|
free(linkname);
|
|
|
|
return bf;
|
|
}
|
|
|
|
char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
|
|
bool is_debug)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
|
|
|
|
return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms);
|
|
}
|
|
|
|
static int write_buildid(const char *name, size_t name_len, struct build_id *bid,
|
|
pid_t pid, u16 misc, struct feat_fd *fd)
|
|
{
|
|
int err;
|
|
struct perf_record_header_build_id b;
|
|
size_t len;
|
|
|
|
len = name_len + 1;
|
|
len = PERF_ALIGN(len, NAME_ALIGN);
|
|
|
|
memset(&b, 0, sizeof(b));
|
|
memcpy(&b.data, bid->data, bid->size);
|
|
b.size = (u8) bid->size;
|
|
misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;
|
|
b.pid = pid;
|
|
b.header.misc = misc;
|
|
b.header.size = sizeof(b) + len;
|
|
|
|
err = do_write(fd, &b, sizeof(b));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return write_padded(fd, name, name_len + 1, len);
|
|
}
|
|
|
|
static int machine__write_buildid_table(struct machine *machine,
|
|
struct feat_fd *fd)
|
|
{
|
|
int err = 0;
|
|
struct dso *pos;
|
|
u16 kmisc = PERF_RECORD_MISC_KERNEL,
|
|
umisc = PERF_RECORD_MISC_USER;
|
|
|
|
if (!machine__is_host(machine)) {
|
|
kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
|
|
umisc = PERF_RECORD_MISC_GUEST_USER;
|
|
}
|
|
|
|
dsos__for_each_with_build_id(pos, &machine->dsos.head) {
|
|
const char *name;
|
|
size_t name_len;
|
|
bool in_kernel = false;
|
|
|
|
if (!pos->hit && !dso__is_vdso(pos))
|
|
continue;
|
|
|
|
if (dso__is_vdso(pos)) {
|
|
name = pos->short_name;
|
|
name_len = pos->short_name_len;
|
|
} else if (dso__is_kcore(pos)) {
|
|
name = machine->mmap_name;
|
|
name_len = strlen(name);
|
|
} else {
|
|
name = pos->long_name;
|
|
name_len = pos->long_name_len;
|
|
}
|
|
|
|
in_kernel = pos->kernel ||
|
|
is_kernel_module(name,
|
|
PERF_RECORD_MISC_CPUMODE_UNKNOWN);
|
|
err = write_buildid(name, name_len, &pos->bid, machine->pid,
|
|
in_kernel ? kmisc : umisc, fd);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int perf_session__write_buildid_table(struct perf_session *session,
|
|
struct feat_fd *fd)
|
|
{
|
|
struct rb_node *nd;
|
|
int err = machine__write_buildid_table(&session->machines.host, fd);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
err = machine__write_buildid_table(pos, fd);
|
|
if (err)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int __dsos__hit_all(struct list_head *head)
|
|
{
|
|
struct dso *pos;
|
|
|
|
list_for_each_entry(pos, head, node)
|
|
pos->hit = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int machine__hit_all_dsos(struct machine *machine)
|
|
{
|
|
return __dsos__hit_all(&machine->dsos.head);
|
|
}
|
|
|
|
int dsos__hit_all(struct perf_session *session)
|
|
{
|
|
struct rb_node *nd;
|
|
int err;
|
|
|
|
err = machine__hit_all_dsos(&session->machines.host);
|
|
if (err)
|
|
return err;
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
|
|
err = machine__hit_all_dsos(pos);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void disable_buildid_cache(void)
|
|
{
|
|
no_buildid_cache = true;
|
|
}
|
|
|
|
static bool lsdir_bid_head_filter(const char *name __maybe_unused,
|
|
struct dirent *d)
|
|
{
|
|
return (strlen(d->d_name) == 2) &&
|
|
isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
|
|
}
|
|
|
|
static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
|
|
struct dirent *d)
|
|
{
|
|
int i = 0;
|
|
while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
|
|
i++;
|
|
return (i >= SBUILD_ID_MIN_SIZE - 3) && (i <= SBUILD_ID_SIZE - 3) &&
|
|
(d->d_name[i] == '\0');
|
|
}
|
|
|
|
struct strlist *build_id_cache__list_all(bool validonly)
|
|
{
|
|
struct strlist *toplist, *linklist = NULL, *bidlist;
|
|
struct str_node *nd, *nd2;
|
|
char *topdir, *linkdir = NULL;
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
/* for filename__ functions */
|
|
if (validonly)
|
|
symbol__init(NULL);
|
|
|
|
/* Open the top-level directory */
|
|
if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
|
|
return NULL;
|
|
|
|
bidlist = strlist__new(NULL, NULL);
|
|
if (!bidlist)
|
|
goto out;
|
|
|
|
toplist = lsdir(topdir, lsdir_bid_head_filter);
|
|
if (!toplist) {
|
|
pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
|
|
/* If there is no buildid cache, return an empty list */
|
|
if (errno == ENOENT)
|
|
goto out;
|
|
goto err_out;
|
|
}
|
|
|
|
strlist__for_each_entry(nd, toplist) {
|
|
if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
|
|
goto err_out;
|
|
/* Open the lower-level directory */
|
|
linklist = lsdir(linkdir, lsdir_bid_tail_filter);
|
|
if (!linklist) {
|
|
pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
|
|
goto err_out;
|
|
}
|
|
strlist__for_each_entry(nd2, linklist) {
|
|
if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
|
|
nd->s, nd2->s) > SBUILD_ID_SIZE - 1)
|
|
goto err_out;
|
|
if (validonly && !build_id_cache__valid_id(sbuild_id))
|
|
continue;
|
|
if (strlist__add(bidlist, sbuild_id) < 0)
|
|
goto err_out;
|
|
}
|
|
strlist__delete(linklist);
|
|
zfree(&linkdir);
|
|
}
|
|
|
|
out_free:
|
|
strlist__delete(toplist);
|
|
out:
|
|
free(topdir);
|
|
|
|
return bidlist;
|
|
|
|
err_out:
|
|
strlist__delete(linklist);
|
|
zfree(&linkdir);
|
|
strlist__delete(bidlist);
|
|
bidlist = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (!isxdigit(maybe_sbuild_id[i]))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Return the valid complete build-id */
|
|
char *build_id_cache__complement(const char *incomplete_sbuild_id)
|
|
{
|
|
struct strlist *bidlist;
|
|
struct str_node *nd, *cand = NULL;
|
|
char *sbuild_id = NULL;
|
|
size_t len = strlen(incomplete_sbuild_id);
|
|
|
|
if (len >= SBUILD_ID_SIZE ||
|
|
!str_is_build_id(incomplete_sbuild_id, len))
|
|
return NULL;
|
|
|
|
bidlist = build_id_cache__list_all(true);
|
|
if (!bidlist)
|
|
return NULL;
|
|
|
|
strlist__for_each_entry(nd, bidlist) {
|
|
if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
|
|
continue;
|
|
if (cand) { /* Error: There are more than 2 candidates. */
|
|
cand = NULL;
|
|
break;
|
|
}
|
|
cand = nd;
|
|
}
|
|
if (cand)
|
|
sbuild_id = strdup(cand->s);
|
|
strlist__delete(bidlist);
|
|
|
|
return sbuild_id;
|
|
}
|
|
|
|
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
|
|
struct nsinfo *nsi, bool is_kallsyms,
|
|
bool is_vdso)
|
|
{
|
|
char *realname = (char *)name, *filename;
|
|
bool slash = is_kallsyms || is_vdso;
|
|
|
|
if (!slash)
|
|
realname = nsinfo__realpath(name, nsi);
|
|
|
|
if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
|
|
is_vdso ? DSO__NAME_VDSO : (realname ? realname : name),
|
|
sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
|
|
filename = NULL;
|
|
|
|
if (!slash)
|
|
free(realname);
|
|
|
|
return filename;
|
|
}
|
|
|
|
int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
|
|
struct strlist **result)
|
|
{
|
|
char *dir_name;
|
|
int ret = 0;
|
|
|
|
dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
|
|
if (!dir_name)
|
|
return -ENOMEM;
|
|
|
|
*result = lsdir(dir_name, lsdir_no_dot_filter);
|
|
if (!*result)
|
|
ret = -errno;
|
|
free(dir_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
|
|
static int build_id_cache__add_sdt_cache(const char *sbuild_id,
|
|
const char *realname,
|
|
struct nsinfo *nsi)
|
|
{
|
|
struct probe_cache *cache;
|
|
int ret;
|
|
struct nscookie nsc;
|
|
|
|
cache = probe_cache__new(sbuild_id, nsi);
|
|
if (!cache)
|
|
return -1;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = probe_cache__scan_sdt(cache, realname);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (ret >= 0) {
|
|
pr_debug4("Found %d SDTs in %s\n", ret, realname);
|
|
if (probe_cache__commit(cache) < 0)
|
|
ret = -1;
|
|
}
|
|
probe_cache__delete(cache);
|
|
return ret;
|
|
}
|
|
#else
|
|
#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
|
|
#endif
|
|
|
|
static char *build_id_cache__find_debug(const char *sbuild_id,
|
|
struct nsinfo *nsi,
|
|
const char *root_dir)
|
|
{
|
|
const char *dirname = "/usr/lib/debug/.build-id/";
|
|
char *realname = NULL;
|
|
char dirbuf[PATH_MAX];
|
|
char *debugfile;
|
|
struct nscookie nsc;
|
|
size_t len = 0;
|
|
|
|
debugfile = calloc(1, PATH_MAX);
|
|
if (!debugfile)
|
|
goto out;
|
|
|
|
if (root_dir) {
|
|
path__join(dirbuf, PATH_MAX, root_dir, dirname);
|
|
dirname = dirbuf;
|
|
}
|
|
|
|
len = __symbol__join_symfs(debugfile, PATH_MAX, dirname);
|
|
snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
|
|
sbuild_id + 2);
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
realname = realpath(debugfile, NULL);
|
|
if (realname && access(realname, R_OK))
|
|
zfree(&realname);
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT
|
|
if (realname == NULL) {
|
|
debuginfod_client* c;
|
|
|
|
pr_debug("Downloading debug info with build id %s\n", sbuild_id);
|
|
|
|
c = debuginfod_begin();
|
|
if (c != NULL) {
|
|
int fd = debuginfod_find_debuginfo(c,
|
|
(const unsigned char*)sbuild_id, 0,
|
|
&realname);
|
|
if (fd >= 0)
|
|
close(fd); /* retaining reference by realname */
|
|
debuginfod_end(c);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
free(debugfile);
|
|
return realname;
|
|
}
|
|
|
|
int
|
|
build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
|
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
|
|
const char *proper_name, const char *root_dir)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;
|
|
char *debugfile = NULL;
|
|
int err = -1;
|
|
|
|
if (!proper_name)
|
|
proper_name = name;
|
|
|
|
dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms,
|
|
is_vdso);
|
|
if (!dir_name)
|
|
goto out_free;
|
|
|
|
/* Remove old style build-id cache */
|
|
if (is_regular_file(dir_name))
|
|
if (unlink(dir_name))
|
|
goto out_free;
|
|
|
|
if (mkdir_p(dir_name, 0755))
|
|
goto out_free;
|
|
|
|
/* Save the allocated buildid dirname */
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(is_kallsyms, is_vdso,
|
|
false)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (access(filename, F_OK)) {
|
|
if (is_kallsyms) {
|
|
if (copyfile("/proc/kallsyms", filename))
|
|
goto out_free;
|
|
} else if (nsi && nsinfo__need_setns(nsi)) {
|
|
if (copyfile_ns(name, filename, nsi))
|
|
goto out_free;
|
|
} else if (link(realname, filename) && errno != EEXIST) {
|
|
struct stat f_stat;
|
|
|
|
if (!(stat(name, &f_stat) < 0) &&
|
|
copyfile_mode(name, filename, f_stat.st_mode))
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
/* Some binaries are stripped, but have .debug files with their symbol
|
|
* table. Check to see if we can locate one of those, since the elf
|
|
* file itself may not be very useful to users of our tools without a
|
|
* symtab.
|
|
*/
|
|
if (!is_kallsyms && !is_vdso &&
|
|
strncmp(".ko", name + strlen(name) - 3, 3)) {
|
|
debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir);
|
|
if (debugfile) {
|
|
zfree(&filename);
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(false, false, true)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
if (access(filename, F_OK)) {
|
|
if (nsi && nsinfo__need_setns(nsi)) {
|
|
if (copyfile_ns(debugfile, filename,
|
|
nsi))
|
|
goto out_free;
|
|
} else if (link(debugfile, filename) &&
|
|
errno != EEXIST &&
|
|
copyfile(debugfile, filename))
|
|
goto out_free;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
tmp = strrchr(linkname, '/');
|
|
*tmp = '\0';
|
|
|
|
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
|
|
goto out_free;
|
|
|
|
*tmp = '/';
|
|
tmp = dir_name + strlen(buildid_dir) - 5;
|
|
memcpy(tmp, "../..", 5);
|
|
|
|
if (symlink(tmp, linkname) == 0) {
|
|
err = 0;
|
|
} else if (errno == EEXIST) {
|
|
char path[PATH_MAX];
|
|
ssize_t len;
|
|
|
|
len = readlink(linkname, path, sizeof(path) - 1);
|
|
if (len <= 0) {
|
|
pr_err("Can't read link: %s\n", linkname);
|
|
goto out_free;
|
|
}
|
|
path[len] = '\0';
|
|
|
|
if (strcmp(tmp, path)) {
|
|
pr_debug("build <%s> already linked to %s\n",
|
|
sbuild_id, linkname);
|
|
}
|
|
err = 0;
|
|
}
|
|
|
|
/* Update SDT cache : error is just warned */
|
|
if (realname &&
|
|
build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
|
|
pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
|
|
|
|
out_free:
|
|
free(filename);
|
|
free(debugfile);
|
|
free(dir_name);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
int __build_id_cache__add_s(const char *sbuild_id, const char *name,
|
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
|
|
const char *proper_name, const char *root_dir)
|
|
{
|
|
char *realname = NULL;
|
|
int err = -1;
|
|
|
|
if (!is_kallsyms) {
|
|
if (!is_vdso)
|
|
realname = nsinfo__realpath(name, nsi);
|
|
else
|
|
realname = realpath(name, NULL);
|
|
if (!realname)
|
|
goto out_free;
|
|
}
|
|
|
|
err = build_id_cache__add(sbuild_id, name, realname, nsi,
|
|
is_kallsyms, is_vdso, proper_name, root_dir);
|
|
out_free:
|
|
if (!is_kallsyms)
|
|
free(realname);
|
|
return err;
|
|
}
|
|
|
|
static int build_id_cache__add_b(const struct build_id *bid,
|
|
const char *name, struct nsinfo *nsi,
|
|
bool is_kallsyms, bool is_vdso,
|
|
const char *proper_name,
|
|
const char *root_dir)
|
|
{
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
build_id__sprintf(bid, sbuild_id);
|
|
|
|
return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
|
|
is_vdso, proper_name, root_dir);
|
|
}
|
|
|
|
bool build_id_cache__cached(const char *sbuild_id)
|
|
{
|
|
bool ret = false;
|
|
char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
|
|
if (filename && !access(filename, F_OK))
|
|
ret = true;
|
|
free(filename);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int build_id_cache__remove_s(const char *sbuild_id)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *filename = zalloc(size),
|
|
*linkname = zalloc(size), *tmp;
|
|
int err = -1;
|
|
|
|
if (filename == NULL || linkname == NULL)
|
|
goto out_free;
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
|
|
if (access(linkname, F_OK))
|
|
goto out_free;
|
|
|
|
if (readlink(linkname, filename, size - 1) < 0)
|
|
goto out_free;
|
|
|
|
if (unlink(linkname))
|
|
goto out_free;
|
|
|
|
/*
|
|
* Since the link is relative, we must make it absolute:
|
|
*/
|
|
tmp = strrchr(linkname, '/') + 1;
|
|
snprintf(tmp, size - (tmp - linkname), "%s", filename);
|
|
|
|
if (rm_rf(linkname))
|
|
goto out_free;
|
|
|
|
err = 0;
|
|
out_free:
|
|
free(filename);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int filename__read_build_id_ns(const char *filename,
|
|
struct build_id *bid,
|
|
struct nsinfo *nsi)
|
|
{
|
|
struct nscookie nsc;
|
|
int ret;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = filename__read_build_id(filename, bid);
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool dso__build_id_mismatch(struct dso *dso, const char *name)
|
|
{
|
|
struct build_id bid;
|
|
bool ret = false;
|
|
|
|
mutex_lock(&dso->lock);
|
|
if (filename__read_build_id_ns(name, &bid, dso->nsinfo) >= 0)
|
|
ret = !dso__build_id_equal(dso, &bid);
|
|
|
|
mutex_unlock(&dso->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dso__cache_build_id(struct dso *dso, struct machine *machine,
|
|
void *priv __maybe_unused)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms(dso);
|
|
bool is_vdso = dso__is_vdso(dso);
|
|
const char *name = dso->long_name;
|
|
const char *proper_name = NULL;
|
|
const char *root_dir = NULL;
|
|
char *allocated_name = NULL;
|
|
int ret = 0;
|
|
|
|
if (!dso->has_build_id)
|
|
return 0;
|
|
|
|
if (dso__is_kcore(dso)) {
|
|
is_kallsyms = true;
|
|
name = machine->mmap_name;
|
|
}
|
|
|
|
if (!machine__is_host(machine)) {
|
|
if (*machine->root_dir) {
|
|
root_dir = machine->root_dir;
|
|
ret = asprintf(&allocated_name, "%s/%s", root_dir, name);
|
|
if (ret < 0)
|
|
return ret;
|
|
proper_name = name;
|
|
name = allocated_name;
|
|
} else if (is_kallsyms) {
|
|
/* Cannot get guest kallsyms */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (!is_kallsyms && dso__build_id_mismatch(dso, name))
|
|
goto out_free;
|
|
|
|
mutex_lock(&dso->lock);
|
|
ret = build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
|
|
is_kallsyms, is_vdso, proper_name, root_dir);
|
|
mutex_unlock(&dso->lock);
|
|
out_free:
|
|
free(allocated_name);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv)
|
|
{
|
|
int ret = machine__for_each_dso(&machines->host, fn, priv);
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first_cached(&machines->guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
|
|
ret |= machine__for_each_dso(pos, fn, priv);
|
|
}
|
|
return ret ? -1 : 0;
|
|
}
|
|
|
|
int __perf_session__cache_build_ids(struct perf_session *session,
|
|
machine__dso_t fn, void *priv)
|
|
{
|
|
if (no_buildid_cache)
|
|
return 0;
|
|
|
|
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
|
|
return -1;
|
|
|
|
return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0;
|
|
}
|
|
|
|
int perf_session__cache_build_ids(struct perf_session *session)
|
|
{
|
|
return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL);
|
|
}
|
|
|
|
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
|
|
{
|
|
return __dsos__read_build_ids(&machine->dsos.head, with_hits);
|
|
}
|
|
|
|
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
|
|
{
|
|
struct rb_node *nd;
|
|
bool ret = machine__read_build_ids(&session->machines.host, with_hits);
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__read_build_ids(pos, with_hits);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void build_id__init(struct build_id *bid, const u8 *data, size_t size)
|
|
{
|
|
WARN_ON(size > BUILD_ID_SIZE);
|
|
memcpy(bid->data, data, size);
|
|
bid->size = size;
|
|
}
|
|
|
|
bool build_id__is_defined(const struct build_id *bid)
|
|
{
|
|
return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false;
|
|
}
|