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![Ian Rogers](/assets/img/avatar_default.png)
Previously used to specify symbol_name_rb_node was in use. Signed-off-by: Ian Rogers <irogers@google.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Carsten Haitzler <carsten.haitzler@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Jason Wang <wangborong@cdjrlc.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/20230623054520.4118442-4-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
3805 lines
87 KiB
C
3805 lines
87 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* probe-event.c : perf-probe definition to probe_events format converter
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*/
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#include <inttypes.h>
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <elf.h>
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#include "build-id.h"
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#include "event.h"
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#include "namespaces.h"
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#include "strlist.h"
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#include "strfilter.h"
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#include "debug.h"
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#include "dso.h"
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#include "color.h"
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#include "map.h"
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#include "maps.h"
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#include "mutex.h"
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#include "symbol.h"
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#include <api/fs/fs.h>
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#include "trace-event.h" /* For __maybe_unused */
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#include "probe-event.h"
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#include "probe-finder.h"
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#include "probe-file.h"
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#include "session.h"
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#include "string2.h"
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#include "strbuf.h"
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#include <subcmd/pager.h>
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#include <linux/ctype.h>
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#include <linux/zalloc.h>
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#ifdef HAVE_DEBUGINFOD_SUPPORT
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#include <elfutils/debuginfod.h>
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#endif
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#define PERFPROBE_GROUP "probe"
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bool probe_event_dry_run; /* Dry run flag */
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struct probe_conf probe_conf = { .magic_num = DEFAULT_PROBE_MAGIC_NUM };
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#define semantic_error(msg ...) pr_err("Semantic error :" msg)
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int e_snprintf(char *str, size_t size, const char *format, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, format);
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ret = vsnprintf(str, size, format, ap);
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va_end(ap);
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if (ret >= (int)size)
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ret = -E2BIG;
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return ret;
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}
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static struct machine *host_machine;
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/* Initialize symbol maps and path of vmlinux/modules */
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int init_probe_symbol_maps(bool user_only)
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{
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int ret;
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symbol_conf.allow_aliases = true;
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ret = symbol__init(NULL);
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if (ret < 0) {
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pr_debug("Failed to init symbol map.\n");
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goto out;
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}
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if (host_machine || user_only) /* already initialized */
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return 0;
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if (symbol_conf.vmlinux_name)
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pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
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host_machine = machine__new_host();
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if (!host_machine) {
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pr_debug("machine__new_host() failed.\n");
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symbol__exit();
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ret = -1;
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}
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out:
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if (ret < 0)
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pr_warning("Failed to init vmlinux path.\n");
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return ret;
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}
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void exit_probe_symbol_maps(void)
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{
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machine__delete(host_machine);
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host_machine = NULL;
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symbol__exit();
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}
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static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap)
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{
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struct kmap *kmap;
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struct map *map = machine__kernel_map(host_machine);
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if (map__load(map) < 0)
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return NULL;
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kmap = map__kmap(map);
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if (!kmap)
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return NULL;
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if (pmap)
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*pmap = map;
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return kmap->ref_reloc_sym;
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}
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static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
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bool reloc, bool reladdr)
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{
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struct ref_reloc_sym *reloc_sym;
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struct symbol *sym;
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struct map *map;
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/* ref_reloc_sym is just a label. Need a special fix*/
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reloc_sym = kernel_get_ref_reloc_sym(&map);
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if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
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*addr = (!map__reloc(map) || reloc) ? reloc_sym->addr :
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reloc_sym->unrelocated_addr;
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else {
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sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
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if (!sym)
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return -ENOENT;
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*addr = map__unmap_ip(map, sym->start) -
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((reloc) ? 0 : map__reloc(map)) -
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((reladdr) ? map__start(map) : 0);
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}
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return 0;
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}
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static struct map *kernel_get_module_map(const char *module)
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{
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struct maps *maps = machine__kernel_maps(host_machine);
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struct map_rb_node *pos;
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/* A file path -- this is an offline module */
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if (module && strchr(module, '/'))
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return dso__new_map(module);
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if (!module) {
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struct map *map = machine__kernel_map(host_machine);
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return map__get(map);
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}
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maps__for_each_entry(maps, pos) {
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/* short_name is "[module]" */
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struct dso *dso = map__dso(pos->map);
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const char *short_name = dso->short_name;
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u16 short_name_len = dso->short_name_len;
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if (strncmp(short_name + 1, module,
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short_name_len - 2) == 0 &&
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module[short_name_len - 2] == '\0') {
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return map__get(pos->map);
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}
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}
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return NULL;
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}
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struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
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{
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/* Init maps of given executable or kernel */
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if (user) {
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struct map *map;
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struct dso *dso;
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map = dso__new_map(target);
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dso = map ? map__dso(map) : NULL;
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if (dso) {
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mutex_lock(&dso->lock);
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nsinfo__put(dso->nsinfo);
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dso->nsinfo = nsinfo__get(nsi);
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mutex_unlock(&dso->lock);
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}
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return map;
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} else {
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return kernel_get_module_map(target);
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}
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}
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static int convert_exec_to_group(const char *exec, char **result)
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{
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char *ptr1, *ptr2, *exec_copy;
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char buf[64];
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int ret;
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exec_copy = strdup(exec);
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if (!exec_copy)
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return -ENOMEM;
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ptr1 = basename(exec_copy);
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if (!ptr1) {
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ret = -EINVAL;
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goto out;
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}
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for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
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if (!isalnum(*ptr2) && *ptr2 != '_') {
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*ptr2 = '\0';
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break;
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}
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}
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ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
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if (ret < 0)
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goto out;
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*result = strdup(buf);
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ret = *result ? 0 : -ENOMEM;
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out:
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free(exec_copy);
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return ret;
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}
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static void clear_perf_probe_point(struct perf_probe_point *pp)
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{
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zfree(&pp->file);
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zfree(&pp->function);
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zfree(&pp->lazy_line);
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}
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static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
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{
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int i;
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for (i = 0; i < ntevs; i++)
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clear_probe_trace_event(tevs + i);
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}
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static bool kprobe_blacklist__listed(u64 address);
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static bool kprobe_warn_out_range(const char *symbol, u64 address)
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{
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struct map *map;
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bool ret = false;
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map = kernel_get_module_map(NULL);
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if (map) {
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ret = address <= map__start(map) || map__end(map) < address;
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if (ret)
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pr_warning("%s is out of .text, skip it.\n", symbol);
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map__put(map);
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}
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if (!ret && kprobe_blacklist__listed(address)) {
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pr_warning("%s is blacklisted function, skip it.\n", symbol);
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ret = true;
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}
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return ret;
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}
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/*
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* @module can be module name of module file path. In case of path,
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* inspect elf and find out what is actual module name.
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* Caller has to free mod_name after using it.
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*/
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static char *find_module_name(const char *module)
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{
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int fd;
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Elf *elf;
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GElf_Ehdr ehdr;
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GElf_Shdr shdr;
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Elf_Data *data;
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Elf_Scn *sec;
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char *mod_name = NULL;
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int name_offset;
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fd = open(module, O_RDONLY);
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if (fd < 0)
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return NULL;
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elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
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if (elf == NULL)
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goto elf_err;
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if (gelf_getehdr(elf, &ehdr) == NULL)
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goto ret_err;
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sec = elf_section_by_name(elf, &ehdr, &shdr,
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".gnu.linkonce.this_module", NULL);
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if (!sec)
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goto ret_err;
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data = elf_getdata(sec, NULL);
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if (!data || !data->d_buf)
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goto ret_err;
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/*
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* NOTE:
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* '.gnu.linkonce.this_module' section of kernel module elf directly
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* maps to 'struct module' from linux/module.h. This section contains
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* actual module name which will be used by kernel after loading it.
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* But, we cannot use 'struct module' here since linux/module.h is not
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* exposed to user-space. Offset of 'name' has remained same from long
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* time, so hardcoding it here.
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*/
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if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
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name_offset = 12;
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else /* expect ELFCLASS64 by default */
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name_offset = 24;
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mod_name = strdup((char *)data->d_buf + name_offset);
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ret_err:
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elf_end(elf);
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elf_err:
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close(fd);
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return mod_name;
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}
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#ifdef HAVE_DWARF_SUPPORT
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static int kernel_get_module_dso(const char *module, struct dso **pdso)
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{
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struct dso *dso;
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struct map *map;
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const char *vmlinux_name;
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int ret = 0;
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if (module) {
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char module_name[128];
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snprintf(module_name, sizeof(module_name), "[%s]", module);
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map = maps__find_by_name(machine__kernel_maps(host_machine), module_name);
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if (map) {
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dso = map__dso(map);
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goto found;
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}
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pr_debug("Failed to find module %s.\n", module);
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return -ENOENT;
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}
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map = machine__kernel_map(host_machine);
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dso = map__dso(map);
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if (!dso->has_build_id)
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dso__read_running_kernel_build_id(dso, host_machine);
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vmlinux_name = symbol_conf.vmlinux_name;
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dso->load_errno = 0;
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if (vmlinux_name)
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ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
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else
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ret = dso__load_vmlinux_path(dso, map);
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found:
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*pdso = dso;
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return ret;
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}
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/*
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* Some binaries like glibc have special symbols which are on the symbol
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* table, but not in the debuginfo. If we can find the address of the
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* symbol from map, we can translate the address back to the probe point.
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*/
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static int find_alternative_probe_point(struct debuginfo *dinfo,
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struct perf_probe_point *pp,
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struct perf_probe_point *result,
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const char *target, struct nsinfo *nsi,
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bool uprobes)
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{
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struct map *map = NULL;
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struct symbol *sym;
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u64 address = 0;
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int ret = -ENOENT;
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size_t idx;
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/* This can work only for function-name based one */
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if (!pp->function || pp->file)
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return -ENOTSUP;
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map = get_target_map(target, nsi, uprobes);
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if (!map)
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return -EINVAL;
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/* Find the address of given function */
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map__for_each_symbol_by_name(map, pp->function, sym, idx) {
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if (uprobes) {
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address = sym->start;
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if (sym->type == STT_GNU_IFUNC)
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pr_warning("Warning: The probe function (%s) is a GNU indirect function.\n"
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"Consider identifying the final function used at run time and set the probe directly on that.\n",
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pp->function);
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} else
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address = map__unmap_ip(map, sym->start) - map__reloc(map);
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break;
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}
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if (!address) {
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ret = -ENOENT;
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goto out;
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}
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pr_debug("Symbol %s address found : %" PRIx64 "\n",
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pp->function, address);
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ret = debuginfo__find_probe_point(dinfo, address, result);
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if (ret <= 0)
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ret = (!ret) ? -ENOENT : ret;
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else {
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result->offset += pp->offset;
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result->line += pp->line;
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result->retprobe = pp->retprobe;
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ret = 0;
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}
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out:
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map__put(map);
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return ret;
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}
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static int get_alternative_probe_event(struct debuginfo *dinfo,
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struct perf_probe_event *pev,
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struct perf_probe_point *tmp)
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{
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int ret;
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memcpy(tmp, &pev->point, sizeof(*tmp));
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memset(&pev->point, 0, sizeof(pev->point));
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ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
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pev->nsi, pev->uprobes);
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if (ret < 0)
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memcpy(&pev->point, tmp, sizeof(*tmp));
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return ret;
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}
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|
|
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static int get_alternative_line_range(struct debuginfo *dinfo,
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struct line_range *lr,
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const char *target, bool user)
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{
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struct perf_probe_point pp = { .function = lr->function,
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.file = lr->file,
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.line = lr->start };
|
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struct perf_probe_point result;
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int ret, len = 0;
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|
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memset(&result, 0, sizeof(result));
|
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|
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if (lr->end != INT_MAX)
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len = lr->end - lr->start;
|
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ret = find_alternative_probe_point(dinfo, &pp, &result,
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target, NULL, user);
|
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if (!ret) {
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lr->function = result.function;
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lr->file = result.file;
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lr->start = result.line;
|
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if (lr->end != INT_MAX)
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lr->end = lr->start + len;
|
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clear_perf_probe_point(&pp);
|
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}
|
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return ret;
|
|
}
|
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT
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|
static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *nsi,
|
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bool silent)
|
|
{
|
|
debuginfod_client *c = debuginfod_begin();
|
|
char sbuild_id[SBUILD_ID_SIZE + 1];
|
|
struct debuginfo *ret = NULL;
|
|
struct nscookie nsc;
|
|
char *path;
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|
int fd;
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|
|
|
if (!c)
|
|
return NULL;
|
|
|
|
build_id__sprintf(&dso->bid, sbuild_id);
|
|
fd = debuginfod_find_debuginfo(c, (const unsigned char *)sbuild_id,
|
|
0, &path);
|
|
if (fd >= 0)
|
|
close(fd);
|
|
debuginfod_end(c);
|
|
if (fd < 0) {
|
|
if (!silent)
|
|
pr_debug("Failed to find debuginfo in debuginfod.\n");
|
|
return NULL;
|
|
}
|
|
if (!silent)
|
|
pr_debug("Load debuginfo from debuginfod (%s)\n", path);
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = debuginfo__new((const char *)path);
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|
nsinfo__mountns_exit(&nsc);
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return ret;
|
|
}
|
|
#else
|
|
static inline
|
|
struct debuginfo *open_from_debuginfod(struct dso *dso __maybe_unused,
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|
struct nsinfo *nsi __maybe_unused,
|
|
bool silent __maybe_unused)
|
|
{
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|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/* Open new debuginfo of given module */
|
|
static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
|
|
bool silent)
|
|
{
|
|
const char *path = module;
|
|
char reason[STRERR_BUFSIZE];
|
|
struct debuginfo *ret = NULL;
|
|
struct dso *dso = NULL;
|
|
struct nscookie nsc;
|
|
int err;
|
|
|
|
if (!module || !strchr(module, '/')) {
|
|
err = kernel_get_module_dso(module, &dso);
|
|
if (err < 0) {
|
|
if (!dso || dso->load_errno == 0) {
|
|
if (!str_error_r(-err, reason, STRERR_BUFSIZE))
|
|
strcpy(reason, "(unknown)");
|
|
} else
|
|
dso__strerror_load(dso, reason, STRERR_BUFSIZE);
|
|
if (dso)
|
|
ret = open_from_debuginfod(dso, nsi, silent);
|
|
if (ret)
|
|
return ret;
|
|
if (!silent) {
|
|
if (module)
|
|
pr_err("Module %s is not loaded, please specify its full path name.\n", module);
|
|
else
|
|
pr_err("Failed to find the path for the kernel: %s\n", reason);
|
|
}
|
|
return NULL;
|
|
}
|
|
path = dso->long_name;
|
|
}
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = debuginfo__new(path);
|
|
if (!ret && !silent) {
|
|
pr_warning("The %s file has no debug information.\n", path);
|
|
if (!module || !strtailcmp(path, ".ko"))
|
|
pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
|
|
else
|
|
pr_warning("Rebuild with -g, ");
|
|
pr_warning("or install an appropriate debuginfo package.\n");
|
|
}
|
|
nsinfo__mountns_exit(&nsc);
|
|
return ret;
|
|
}
|
|
|
|
/* For caching the last debuginfo */
|
|
static struct debuginfo *debuginfo_cache;
|
|
static char *debuginfo_cache_path;
|
|
|
|
static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
|
|
{
|
|
const char *path = module;
|
|
|
|
/* If the module is NULL, it should be the kernel. */
|
|
if (!module)
|
|
path = "kernel";
|
|
|
|
if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
|
|
goto out;
|
|
|
|
/* Copy module path */
|
|
free(debuginfo_cache_path);
|
|
debuginfo_cache_path = strdup(path);
|
|
if (!debuginfo_cache_path) {
|
|
debuginfo__delete(debuginfo_cache);
|
|
debuginfo_cache = NULL;
|
|
goto out;
|
|
}
|
|
|
|
debuginfo_cache = open_debuginfo(module, NULL, silent);
|
|
if (!debuginfo_cache)
|
|
zfree(&debuginfo_cache_path);
|
|
out:
|
|
return debuginfo_cache;
|
|
}
|
|
|
|
static void debuginfo_cache__exit(void)
|
|
{
|
|
debuginfo__delete(debuginfo_cache);
|
|
debuginfo_cache = NULL;
|
|
zfree(&debuginfo_cache_path);
|
|
}
|
|
|
|
|
|
static int get_text_start_address(const char *exec, u64 *address,
|
|
struct nsinfo *nsi)
|
|
{
|
|
Elf *elf;
|
|
GElf_Ehdr ehdr;
|
|
GElf_Shdr shdr;
|
|
int fd, ret = -ENOENT;
|
|
struct nscookie nsc;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
fd = open(exec, O_RDONLY);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
|
|
if (elf == NULL) {
|
|
ret = -EINVAL;
|
|
goto out_close;
|
|
}
|
|
|
|
if (gelf_getehdr(elf, &ehdr) == NULL)
|
|
goto out;
|
|
|
|
if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
|
|
goto out;
|
|
|
|
*address = shdr.sh_addr - shdr.sh_offset;
|
|
ret = 0;
|
|
out:
|
|
elf_end(elf);
|
|
out_close:
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Convert trace point to probe point with debuginfo
|
|
*/
|
|
static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
|
|
struct perf_probe_point *pp,
|
|
bool is_kprobe)
|
|
{
|
|
struct debuginfo *dinfo = NULL;
|
|
u64 stext = 0;
|
|
u64 addr = tp->address;
|
|
int ret = -ENOENT;
|
|
|
|
/* convert the address to dwarf address */
|
|
if (!is_kprobe) {
|
|
if (!addr) {
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
ret = get_text_start_address(tp->module, &stext, NULL);
|
|
if (ret < 0)
|
|
goto error;
|
|
addr += stext;
|
|
} else if (tp->symbol) {
|
|
/* If the module is given, this returns relative address */
|
|
ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
|
|
false, !!tp->module);
|
|
if (ret != 0)
|
|
goto error;
|
|
addr += tp->offset;
|
|
}
|
|
|
|
pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
|
|
tp->module ? : "kernel");
|
|
|
|
dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
|
|
if (dinfo)
|
|
ret = debuginfo__find_probe_point(dinfo, addr, pp);
|
|
else
|
|
ret = -ENOENT;
|
|
|
|
if (ret > 0) {
|
|
pp->retprobe = tp->retprobe;
|
|
return 0;
|
|
}
|
|
error:
|
|
pr_debug("Failed to find corresponding probes from debuginfo.\n");
|
|
return ret ? : -ENOENT;
|
|
}
|
|
|
|
/* Adjust symbol name and address */
|
|
static int post_process_probe_trace_point(struct probe_trace_point *tp,
|
|
struct map *map, u64 offs)
|
|
{
|
|
struct symbol *sym;
|
|
u64 addr = tp->address - offs;
|
|
|
|
sym = map__find_symbol(map, addr);
|
|
if (!sym) {
|
|
/*
|
|
* If the address is in the inittext section, map can not
|
|
* find it. Ignore it if we are probing offline kernel.
|
|
*/
|
|
return (symbol_conf.ignore_vmlinux_buildid) ? 0 : -ENOENT;
|
|
}
|
|
|
|
if (strcmp(sym->name, tp->symbol)) {
|
|
/* If we have no realname, use symbol for it */
|
|
if (!tp->realname)
|
|
tp->realname = tp->symbol;
|
|
else
|
|
free(tp->symbol);
|
|
tp->symbol = strdup(sym->name);
|
|
if (!tp->symbol)
|
|
return -ENOMEM;
|
|
}
|
|
tp->offset = addr - sym->start;
|
|
tp->address -= offs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
|
|
* and generate new symbols with suffixes such as .constprop.N or .isra.N
|
|
* etc. Since those symbols are not recorded in DWARF, we have to find
|
|
* correct generated symbols from offline ELF binary.
|
|
* For online kernel or uprobes we don't need this because those are
|
|
* rebased on _text, or already a section relative address.
|
|
*/
|
|
static int
|
|
post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
|
|
int ntevs, const char *pathname)
|
|
{
|
|
struct map *map;
|
|
u64 stext = 0;
|
|
int i, ret = 0;
|
|
|
|
/* Prepare a map for offline binary */
|
|
map = dso__new_map(pathname);
|
|
if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
|
|
pr_warning("Failed to get ELF symbols for %s\n", pathname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < ntevs; i++) {
|
|
ret = post_process_probe_trace_point(&tevs[i].point,
|
|
map, stext);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
map__put(map);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
|
|
int ntevs, const char *exec,
|
|
struct nsinfo *nsi)
|
|
{
|
|
int i, ret = 0;
|
|
u64 stext = 0;
|
|
|
|
if (!exec)
|
|
return 0;
|
|
|
|
ret = get_text_start_address(exec, &stext, nsi);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < ntevs && ret >= 0; i++) {
|
|
/* point.address is the address of point.symbol + point.offset */
|
|
tevs[i].point.address -= stext;
|
|
tevs[i].point.module = strdup(exec);
|
|
if (!tevs[i].point.module) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
tevs[i].uprobes = true;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
post_process_module_probe_trace_events(struct probe_trace_event *tevs,
|
|
int ntevs, const char *module,
|
|
struct debuginfo *dinfo)
|
|
{
|
|
Dwarf_Addr text_offs = 0;
|
|
int i, ret = 0;
|
|
char *mod_name = NULL;
|
|
struct map *map;
|
|
|
|
if (!module)
|
|
return 0;
|
|
|
|
map = get_target_map(module, NULL, false);
|
|
if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
|
|
pr_warning("Failed to get ELF symbols for %s\n", module);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mod_name = find_module_name(module);
|
|
for (i = 0; i < ntevs; i++) {
|
|
ret = post_process_probe_trace_point(&tevs[i].point,
|
|
map, text_offs);
|
|
if (ret < 0)
|
|
break;
|
|
tevs[i].point.module =
|
|
strdup(mod_name ? mod_name : module);
|
|
if (!tevs[i].point.module) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(mod_name);
|
|
map__put(map);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
|
|
int ntevs)
|
|
{
|
|
struct ref_reloc_sym *reloc_sym;
|
|
struct map *map;
|
|
char *tmp;
|
|
int i, skipped = 0;
|
|
|
|
/* Skip post process if the target is an offline kernel */
|
|
if (symbol_conf.ignore_vmlinux_buildid)
|
|
return post_process_offline_probe_trace_events(tevs, ntevs,
|
|
symbol_conf.vmlinux_name);
|
|
|
|
reloc_sym = kernel_get_ref_reloc_sym(&map);
|
|
if (!reloc_sym) {
|
|
pr_warning("Relocated base symbol is not found! "
|
|
"Check /proc/sys/kernel/kptr_restrict\n"
|
|
"and /proc/sys/kernel/perf_event_paranoid. "
|
|
"Or run as privileged perf user.\n\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < ntevs; i++) {
|
|
if (!tevs[i].point.address)
|
|
continue;
|
|
if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
|
|
continue;
|
|
/*
|
|
* If we found a wrong one, mark it by NULL symbol.
|
|
* Since addresses in debuginfo is same as objdump, we need
|
|
* to convert it to addresses on memory.
|
|
*/
|
|
if (kprobe_warn_out_range(tevs[i].point.symbol,
|
|
map__objdump_2mem(map, tevs[i].point.address))) {
|
|
tmp = NULL;
|
|
skipped++;
|
|
} else {
|
|
tmp = strdup(reloc_sym->name);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
}
|
|
/* If we have no realname, use symbol for it */
|
|
if (!tevs[i].point.realname)
|
|
tevs[i].point.realname = tevs[i].point.symbol;
|
|
else
|
|
free(tevs[i].point.symbol);
|
|
tevs[i].point.symbol = tmp;
|
|
tevs[i].point.offset = tevs[i].point.address -
|
|
(map__reloc(map) ? reloc_sym->unrelocated_addr :
|
|
reloc_sym->addr);
|
|
}
|
|
return skipped;
|
|
}
|
|
|
|
void __weak
|
|
arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
|
|
int ntevs __maybe_unused)
|
|
{
|
|
}
|
|
|
|
/* Post processing the probe events */
|
|
static int post_process_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event *tevs,
|
|
int ntevs, const char *module,
|
|
bool uprobe, struct debuginfo *dinfo)
|
|
{
|
|
int ret;
|
|
|
|
if (uprobe)
|
|
ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
|
|
pev->nsi);
|
|
else if (module)
|
|
/* Currently ref_reloc_sym based probe is not for drivers */
|
|
ret = post_process_module_probe_trace_events(tevs, ntevs,
|
|
module, dinfo);
|
|
else
|
|
ret = post_process_kernel_probe_trace_events(tevs, ntevs);
|
|
|
|
if (ret >= 0)
|
|
arch__post_process_probe_trace_events(pev, ntevs);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Try to find perf_probe_event with debuginfo */
|
|
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs)
|
|
{
|
|
bool need_dwarf = perf_probe_event_need_dwarf(pev);
|
|
struct perf_probe_point tmp;
|
|
struct debuginfo *dinfo;
|
|
int ntevs, ret = 0;
|
|
|
|
/* Workaround for gcc #98776 issue.
|
|
* Perf failed to add kretprobe event with debuginfo of vmlinux which is
|
|
* compiled by gcc with -fpatchable-function-entry option enabled. The
|
|
* same issue with kernel module. The retprobe doesn`t need debuginfo.
|
|
* This workaround solution use map to query the probe function address
|
|
* for retprobe event.
|
|
*/
|
|
if (pev->point.retprobe)
|
|
return 0;
|
|
|
|
dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
|
|
if (!dinfo) {
|
|
if (need_dwarf)
|
|
return -ENODATA;
|
|
pr_debug("Could not open debuginfo. Try to use symbols.\n");
|
|
return 0;
|
|
}
|
|
|
|
pr_debug("Try to find probe point from debuginfo.\n");
|
|
/* Searching trace events corresponding to a probe event */
|
|
ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
|
|
|
|
if (ntevs == 0) { /* Not found, retry with an alternative */
|
|
ret = get_alternative_probe_event(dinfo, pev, &tmp);
|
|
if (!ret) {
|
|
ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
|
|
/*
|
|
* Write back to the original probe_event for
|
|
* setting appropriate (user given) event name
|
|
*/
|
|
clear_perf_probe_point(&pev->point);
|
|
memcpy(&pev->point, &tmp, sizeof(tmp));
|
|
}
|
|
}
|
|
|
|
if (ntevs > 0) { /* Succeeded to find trace events */
|
|
pr_debug("Found %d probe_trace_events.\n", ntevs);
|
|
ret = post_process_probe_trace_events(pev, *tevs, ntevs,
|
|
pev->target, pev->uprobes, dinfo);
|
|
if (ret < 0 || ret == ntevs) {
|
|
pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
|
|
clear_probe_trace_events(*tevs, ntevs);
|
|
zfree(tevs);
|
|
ntevs = 0;
|
|
}
|
|
}
|
|
|
|
debuginfo__delete(dinfo);
|
|
|
|
if (ntevs == 0) { /* No error but failed to find probe point. */
|
|
pr_warning("Probe point '%s' not found.\n",
|
|
synthesize_perf_probe_point(&pev->point));
|
|
return -ENODEV;
|
|
} else if (ntevs < 0) {
|
|
/* Error path : ntevs < 0 */
|
|
pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
|
|
if (ntevs == -EBADF)
|
|
pr_warning("Warning: No dwarf info found in the vmlinux - "
|
|
"please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
|
|
if (!need_dwarf) {
|
|
pr_debug("Trying to use symbols.\n");
|
|
return 0;
|
|
}
|
|
}
|
|
return ntevs;
|
|
}
|
|
|
|
#define LINEBUF_SIZE 256
|
|
#define NR_ADDITIONAL_LINES 2
|
|
|
|
static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
|
|
{
|
|
char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
|
|
const char *color = show_num ? "" : PERF_COLOR_BLUE;
|
|
const char *prefix = NULL;
|
|
|
|
do {
|
|
if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
|
|
goto error;
|
|
if (skip)
|
|
continue;
|
|
if (!prefix) {
|
|
prefix = show_num ? "%7d " : " ";
|
|
color_fprintf(stdout, color, prefix, l);
|
|
}
|
|
color_fprintf(stdout, color, "%s", buf);
|
|
|
|
} while (strchr(buf, '\n') == NULL);
|
|
|
|
return 1;
|
|
error:
|
|
if (ferror(fp)) {
|
|
pr_warning("File read error: %s\n",
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
|
|
{
|
|
int rv = __show_one_line(fp, l, skip, show_num);
|
|
if (rv == 0) {
|
|
pr_warning("Source file is shorter than expected.\n");
|
|
rv = -1;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
#define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
|
|
#define show_one_line(f,l) _show_one_line(f,l,false,false)
|
|
#define skip_one_line(f,l) _show_one_line(f,l,true,false)
|
|
#define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
|
|
|
|
/*
|
|
* Show line-range always requires debuginfo to find source file and
|
|
* line number.
|
|
*/
|
|
static int __show_line_range(struct line_range *lr, const char *module,
|
|
bool user)
|
|
{
|
|
struct build_id bid;
|
|
int l = 1;
|
|
struct int_node *ln;
|
|
struct debuginfo *dinfo;
|
|
FILE *fp;
|
|
int ret;
|
|
char *tmp;
|
|
char sbuf[STRERR_BUFSIZE];
|
|
char sbuild_id[SBUILD_ID_SIZE] = "";
|
|
|
|
/* Search a line range */
|
|
dinfo = open_debuginfo(module, NULL, false);
|
|
if (!dinfo)
|
|
return -ENOENT;
|
|
|
|
ret = debuginfo__find_line_range(dinfo, lr);
|
|
if (!ret) { /* Not found, retry with an alternative */
|
|
ret = get_alternative_line_range(dinfo, lr, module, user);
|
|
if (!ret)
|
|
ret = debuginfo__find_line_range(dinfo, lr);
|
|
}
|
|
if (dinfo->build_id) {
|
|
build_id__init(&bid, dinfo->build_id, BUILD_ID_SIZE);
|
|
build_id__sprintf(&bid, sbuild_id);
|
|
}
|
|
debuginfo__delete(dinfo);
|
|
if (ret == 0 || ret == -ENOENT) {
|
|
pr_warning("Specified source line is not found.\n");
|
|
return -ENOENT;
|
|
} else if (ret < 0) {
|
|
pr_warning("Debuginfo analysis failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Convert source file path */
|
|
tmp = lr->path;
|
|
ret = find_source_path(tmp, sbuild_id, lr->comp_dir, &lr->path);
|
|
|
|
/* Free old path when new path is assigned */
|
|
if (tmp != lr->path)
|
|
free(tmp);
|
|
|
|
if (ret < 0) {
|
|
pr_warning("Failed to find source file path.\n");
|
|
return ret;
|
|
}
|
|
|
|
setup_pager();
|
|
|
|
if (lr->function)
|
|
fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
|
|
lr->start - lr->offset);
|
|
else
|
|
fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
|
|
|
|
fp = fopen(lr->path, "r");
|
|
if (fp == NULL) {
|
|
pr_warning("Failed to open %s: %s\n", lr->path,
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
|
return -errno;
|
|
}
|
|
/* Skip to starting line number */
|
|
while (l < lr->start) {
|
|
ret = skip_one_line(fp, l++);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
|
|
intlist__for_each_entry(ln, lr->line_list) {
|
|
for (; ln->i > (unsigned long)l; l++) {
|
|
ret = show_one_line(fp, l - lr->offset);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
ret = show_one_line_with_num(fp, l++ - lr->offset);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
|
|
if (lr->end == INT_MAX)
|
|
lr->end = l + NR_ADDITIONAL_LINES;
|
|
while (l <= lr->end) {
|
|
ret = show_one_line_or_eof(fp, l++ - lr->offset);
|
|
if (ret <= 0)
|
|
break;
|
|
}
|
|
end:
|
|
fclose(fp);
|
|
return ret;
|
|
}
|
|
|
|
int show_line_range(struct line_range *lr, const char *module,
|
|
struct nsinfo *nsi, bool user)
|
|
{
|
|
int ret;
|
|
struct nscookie nsc;
|
|
|
|
ret = init_probe_symbol_maps(user);
|
|
if (ret < 0)
|
|
return ret;
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = __show_line_range(lr, module, user);
|
|
nsinfo__mountns_exit(&nsc);
|
|
exit_probe_symbol_maps();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int show_available_vars_at(struct debuginfo *dinfo,
|
|
struct perf_probe_event *pev,
|
|
struct strfilter *_filter)
|
|
{
|
|
char *buf;
|
|
int ret, i, nvars;
|
|
struct str_node *node;
|
|
struct variable_list *vls = NULL, *vl;
|
|
struct perf_probe_point tmp;
|
|
const char *var;
|
|
|
|
buf = synthesize_perf_probe_point(&pev->point);
|
|
if (!buf)
|
|
return -EINVAL;
|
|
pr_debug("Searching variables at %s\n", buf);
|
|
|
|
ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
|
|
if (!ret) { /* Not found, retry with an alternative */
|
|
ret = get_alternative_probe_event(dinfo, pev, &tmp);
|
|
if (!ret) {
|
|
ret = debuginfo__find_available_vars_at(dinfo, pev,
|
|
&vls);
|
|
/* Release the old probe_point */
|
|
clear_perf_probe_point(&tmp);
|
|
}
|
|
}
|
|
if (ret <= 0) {
|
|
if (ret == 0 || ret == -ENOENT) {
|
|
pr_err("Failed to find the address of %s\n", buf);
|
|
ret = -ENOENT;
|
|
} else
|
|
pr_warning("Debuginfo analysis failed.\n");
|
|
goto end;
|
|
}
|
|
|
|
/* Some variables are found */
|
|
fprintf(stdout, "Available variables at %s\n", buf);
|
|
for (i = 0; i < ret; i++) {
|
|
vl = &vls[i];
|
|
/*
|
|
* A probe point might be converted to
|
|
* several trace points.
|
|
*/
|
|
fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
|
|
vl->point.offset);
|
|
zfree(&vl->point.symbol);
|
|
nvars = 0;
|
|
if (vl->vars) {
|
|
strlist__for_each_entry(node, vl->vars) {
|
|
var = strchr(node->s, '\t') + 1;
|
|
if (strfilter__compare(_filter, var)) {
|
|
fprintf(stdout, "\t\t%s\n", node->s);
|
|
nvars++;
|
|
}
|
|
}
|
|
strlist__delete(vl->vars);
|
|
}
|
|
if (nvars == 0)
|
|
fprintf(stdout, "\t\t(No matched variables)\n");
|
|
}
|
|
free(vls);
|
|
end:
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Show available variables on given probe point */
|
|
int show_available_vars(struct perf_probe_event *pevs, int npevs,
|
|
struct strfilter *_filter)
|
|
{
|
|
int i, ret = 0;
|
|
struct debuginfo *dinfo;
|
|
|
|
ret = init_probe_symbol_maps(pevs->uprobes);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
|
|
if (!dinfo) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
setup_pager();
|
|
|
|
for (i = 0; i < npevs && ret >= 0; i++)
|
|
ret = show_available_vars_at(dinfo, &pevs[i], _filter);
|
|
|
|
debuginfo__delete(dinfo);
|
|
out:
|
|
exit_probe_symbol_maps();
|
|
return ret;
|
|
}
|
|
|
|
#else /* !HAVE_DWARF_SUPPORT */
|
|
|
|
static void debuginfo_cache__exit(void)
|
|
{
|
|
}
|
|
|
|
static int
|
|
find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
|
|
struct perf_probe_point *pp __maybe_unused,
|
|
bool is_kprobe __maybe_unused)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs __maybe_unused)
|
|
{
|
|
if (perf_probe_event_need_dwarf(pev)) {
|
|
pr_warning("Debuginfo-analysis is not supported.\n");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int show_line_range(struct line_range *lr __maybe_unused,
|
|
const char *module __maybe_unused,
|
|
struct nsinfo *nsi __maybe_unused,
|
|
bool user __maybe_unused)
|
|
{
|
|
pr_warning("Debuginfo-analysis is not supported.\n");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
|
|
int npevs __maybe_unused,
|
|
struct strfilter *filter __maybe_unused)
|
|
{
|
|
pr_warning("Debuginfo-analysis is not supported.\n");
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
void line_range__clear(struct line_range *lr)
|
|
{
|
|
zfree(&lr->function);
|
|
zfree(&lr->file);
|
|
zfree(&lr->path);
|
|
zfree(&lr->comp_dir);
|
|
intlist__delete(lr->line_list);
|
|
}
|
|
|
|
int line_range__init(struct line_range *lr)
|
|
{
|
|
memset(lr, 0, sizeof(*lr));
|
|
lr->line_list = intlist__new(NULL);
|
|
if (!lr->line_list)
|
|
return -ENOMEM;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int parse_line_num(char **ptr, int *val, const char *what)
|
|
{
|
|
const char *start = *ptr;
|
|
|
|
errno = 0;
|
|
*val = strtol(*ptr, ptr, 0);
|
|
if (errno || *ptr == start) {
|
|
semantic_error("'%s' is not a valid number.\n", what);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Check the name is good for event, group or function */
|
|
static bool is_c_func_name(const char *name)
|
|
{
|
|
if (!isalpha(*name) && *name != '_')
|
|
return false;
|
|
while (*++name != '\0') {
|
|
if (!isalpha(*name) && !isdigit(*name) && *name != '_')
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Stuff 'lr' according to the line range described by 'arg'.
|
|
* The line range syntax is described by:
|
|
*
|
|
* SRC[:SLN[+NUM|-ELN]]
|
|
* FNC[@SRC][:SLN[+NUM|-ELN]]
|
|
*/
|
|
int parse_line_range_desc(const char *arg, struct line_range *lr)
|
|
{
|
|
char *range, *file, *name = strdup(arg);
|
|
int err;
|
|
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
lr->start = 0;
|
|
lr->end = INT_MAX;
|
|
|
|
range = strchr(name, ':');
|
|
if (range) {
|
|
*range++ = '\0';
|
|
|
|
err = parse_line_num(&range, &lr->start, "start line");
|
|
if (err)
|
|
goto err;
|
|
|
|
if (*range == '+' || *range == '-') {
|
|
const char c = *range++;
|
|
|
|
err = parse_line_num(&range, &lr->end, "end line");
|
|
if (err)
|
|
goto err;
|
|
|
|
if (c == '+') {
|
|
lr->end += lr->start;
|
|
/*
|
|
* Adjust the number of lines here.
|
|
* If the number of lines == 1, the
|
|
* end of line should be equal to
|
|
* the start of line.
|
|
*/
|
|
lr->end--;
|
|
}
|
|
}
|
|
|
|
pr_debug("Line range is %d to %d\n", lr->start, lr->end);
|
|
|
|
err = -EINVAL;
|
|
if (lr->start > lr->end) {
|
|
semantic_error("Start line must be smaller"
|
|
" than end line.\n");
|
|
goto err;
|
|
}
|
|
if (*range != '\0') {
|
|
semantic_error("Tailing with invalid str '%s'.\n", range);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
file = strchr(name, '@');
|
|
if (file) {
|
|
*file = '\0';
|
|
lr->file = strdup(++file);
|
|
if (lr->file == NULL) {
|
|
err = -ENOMEM;
|
|
goto err;
|
|
}
|
|
lr->function = name;
|
|
} else if (strchr(name, '/') || strchr(name, '.'))
|
|
lr->file = name;
|
|
else if (is_c_func_name(name))/* We reuse it for checking funcname */
|
|
lr->function = name;
|
|
else { /* Invalid name */
|
|
semantic_error("'%s' is not a valid function name.\n", name);
|
|
err = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
free(name);
|
|
return err;
|
|
}
|
|
|
|
static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
|
|
{
|
|
char *ptr;
|
|
|
|
ptr = strpbrk_esc(*arg, ":");
|
|
if (ptr) {
|
|
*ptr = '\0';
|
|
if (!pev->sdt && !is_c_func_name(*arg))
|
|
goto ng_name;
|
|
pev->group = strdup_esc(*arg);
|
|
if (!pev->group)
|
|
return -ENOMEM;
|
|
*arg = ptr + 1;
|
|
} else
|
|
pev->group = NULL;
|
|
|
|
pev->event = strdup_esc(*arg);
|
|
if (pev->event == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (!pev->sdt && !is_c_func_name(pev->event)) {
|
|
zfree(&pev->event);
|
|
ng_name:
|
|
zfree(&pev->group);
|
|
semantic_error("%s is bad for event name -it must "
|
|
"follow C symbol-naming rule.\n", *arg);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Parse probepoint definition. */
|
|
static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
|
|
{
|
|
struct perf_probe_point *pp = &pev->point;
|
|
char *ptr, *tmp;
|
|
char c, nc = 0;
|
|
bool file_spec = false;
|
|
int ret;
|
|
|
|
/*
|
|
* <Syntax>
|
|
* perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
|
|
* perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
|
|
* perf probe %[GRP:]SDT_EVENT
|
|
*/
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (is_sdt_event(arg)) {
|
|
pev->sdt = true;
|
|
if (arg[0] == '%')
|
|
arg++;
|
|
}
|
|
|
|
ptr = strpbrk_esc(arg, ";=@+%");
|
|
if (pev->sdt) {
|
|
if (ptr) {
|
|
if (*ptr != '@') {
|
|
semantic_error("%s must be an SDT name.\n",
|
|
arg);
|
|
return -EINVAL;
|
|
}
|
|
/* This must be a target file name or build id */
|
|
tmp = build_id_cache__complement(ptr + 1);
|
|
if (tmp) {
|
|
pev->target = build_id_cache__origname(tmp);
|
|
free(tmp);
|
|
} else
|
|
pev->target = strdup_esc(ptr + 1);
|
|
if (!pev->target)
|
|
return -ENOMEM;
|
|
*ptr = '\0';
|
|
}
|
|
ret = parse_perf_probe_event_name(&arg, pev);
|
|
if (ret == 0) {
|
|
if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
|
|
ret = -errno;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
if (ptr && *ptr == '=') { /* Event name */
|
|
*ptr = '\0';
|
|
tmp = ptr + 1;
|
|
ret = parse_perf_probe_event_name(&arg, pev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
arg = tmp;
|
|
}
|
|
|
|
/*
|
|
* Check arg is function or file name and copy it.
|
|
*
|
|
* We consider arg to be a file spec if and only if it satisfies
|
|
* all of the below criteria::
|
|
* - it does not include any of "+@%",
|
|
* - it includes one of ":;", and
|
|
* - it has a period '.' in the name.
|
|
*
|
|
* Otherwise, we consider arg to be a function specification.
|
|
*/
|
|
if (!strpbrk_esc(arg, "+@%")) {
|
|
ptr = strpbrk_esc(arg, ";:");
|
|
/* This is a file spec if it includes a '.' before ; or : */
|
|
if (ptr && memchr(arg, '.', ptr - arg))
|
|
file_spec = true;
|
|
}
|
|
|
|
ptr = strpbrk_esc(arg, ";:+@%");
|
|
if (ptr) {
|
|
nc = *ptr;
|
|
*ptr++ = '\0';
|
|
}
|
|
|
|
if (arg[0] == '\0')
|
|
tmp = NULL;
|
|
else {
|
|
tmp = strdup_esc(arg);
|
|
if (tmp == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (file_spec)
|
|
pp->file = tmp;
|
|
else {
|
|
pp->function = tmp;
|
|
|
|
/*
|
|
* Keep pp->function even if this is absolute address,
|
|
* so it can mark whether abs_address is valid.
|
|
* Which make 'perf probe lib.bin 0x0' possible.
|
|
*
|
|
* Note that checking length of tmp is not needed
|
|
* because when we access tmp[1] we know tmp[0] is '0',
|
|
* so tmp[1] should always valid (but could be '\0').
|
|
*/
|
|
if (tmp && !strncmp(tmp, "0x", 2)) {
|
|
pp->abs_address = strtoull(pp->function, &tmp, 0);
|
|
if (*tmp != '\0') {
|
|
semantic_error("Invalid absolute address.\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Parse other options */
|
|
while (ptr) {
|
|
arg = ptr;
|
|
c = nc;
|
|
if (c == ';') { /* Lazy pattern must be the last part */
|
|
pp->lazy_line = strdup(arg); /* let leave escapes */
|
|
if (pp->lazy_line == NULL)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
ptr = strpbrk_esc(arg, ";:+@%");
|
|
if (ptr) {
|
|
nc = *ptr;
|
|
*ptr++ = '\0';
|
|
}
|
|
switch (c) {
|
|
case ':': /* Line number */
|
|
pp->line = strtoul(arg, &tmp, 0);
|
|
if (*tmp != '\0') {
|
|
semantic_error("There is non-digit char"
|
|
" in line number.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case '+': /* Byte offset from a symbol */
|
|
pp->offset = strtoul(arg, &tmp, 0);
|
|
if (*tmp != '\0') {
|
|
semantic_error("There is non-digit character"
|
|
" in offset.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case '@': /* File name */
|
|
if (pp->file) {
|
|
semantic_error("SRC@SRC is not allowed.\n");
|
|
return -EINVAL;
|
|
}
|
|
pp->file = strdup_esc(arg);
|
|
if (pp->file == NULL)
|
|
return -ENOMEM;
|
|
break;
|
|
case '%': /* Probe places */
|
|
if (strcmp(arg, "return") == 0) {
|
|
pp->retprobe = 1;
|
|
} else { /* Others not supported yet */
|
|
semantic_error("%%%s is not supported.\n", arg);
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
default: /* Buggy case */
|
|
pr_err("This program has a bug at %s:%d.\n",
|
|
__FILE__, __LINE__);
|
|
return -ENOTSUP;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Exclusion check */
|
|
if (pp->lazy_line && pp->line) {
|
|
semantic_error("Lazy pattern can't be used with"
|
|
" line number.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->lazy_line && pp->offset) {
|
|
semantic_error("Lazy pattern can't be used with offset.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->line && pp->offset) {
|
|
semantic_error("Offset can't be used with line number.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
|
|
semantic_error("File always requires line number or "
|
|
"lazy pattern.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->offset && !pp->function) {
|
|
semantic_error("Offset requires an entry function.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
|
|
semantic_error("Offset/Line/Lazy pattern can't be used with "
|
|
"return probe.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
|
|
pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
|
|
pp->lazy_line);
|
|
return 0;
|
|
}
|
|
|
|
/* Parse perf-probe event argument */
|
|
static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
|
|
{
|
|
char *tmp, *goodname;
|
|
struct perf_probe_arg_field **fieldp;
|
|
|
|
pr_debug("parsing arg: %s into ", str);
|
|
|
|
tmp = strchr(str, '=');
|
|
if (tmp) {
|
|
arg->name = strndup(str, tmp - str);
|
|
if (arg->name == NULL)
|
|
return -ENOMEM;
|
|
pr_debug("name:%s ", arg->name);
|
|
str = tmp + 1;
|
|
}
|
|
|
|
tmp = strchr(str, '@');
|
|
if (tmp && tmp != str && !strcmp(tmp + 1, "user")) { /* user attr */
|
|
if (!user_access_is_supported()) {
|
|
semantic_error("ftrace does not support user access\n");
|
|
return -EINVAL;
|
|
}
|
|
*tmp = '\0';
|
|
arg->user_access = true;
|
|
pr_debug("user_access ");
|
|
}
|
|
|
|
tmp = strchr(str, ':');
|
|
if (tmp) { /* Type setting */
|
|
*tmp = '\0';
|
|
arg->type = strdup(tmp + 1);
|
|
if (arg->type == NULL)
|
|
return -ENOMEM;
|
|
pr_debug("type:%s ", arg->type);
|
|
}
|
|
|
|
tmp = strpbrk(str, "-.[");
|
|
if (!is_c_varname(str) || !tmp) {
|
|
/* A variable, register, symbol or special value */
|
|
arg->var = strdup(str);
|
|
if (arg->var == NULL)
|
|
return -ENOMEM;
|
|
pr_debug("%s\n", arg->var);
|
|
return 0;
|
|
}
|
|
|
|
/* Structure fields or array element */
|
|
arg->var = strndup(str, tmp - str);
|
|
if (arg->var == NULL)
|
|
return -ENOMEM;
|
|
goodname = arg->var;
|
|
pr_debug("%s, ", arg->var);
|
|
fieldp = &arg->field;
|
|
|
|
do {
|
|
*fieldp = zalloc(sizeof(struct perf_probe_arg_field));
|
|
if (*fieldp == NULL)
|
|
return -ENOMEM;
|
|
if (*tmp == '[') { /* Array */
|
|
str = tmp;
|
|
(*fieldp)->index = strtol(str + 1, &tmp, 0);
|
|
(*fieldp)->ref = true;
|
|
if (*tmp != ']' || tmp == str + 1) {
|
|
semantic_error("Array index must be a"
|
|
" number.\n");
|
|
return -EINVAL;
|
|
}
|
|
tmp++;
|
|
if (*tmp == '\0')
|
|
tmp = NULL;
|
|
} else { /* Structure */
|
|
if (*tmp == '.') {
|
|
str = tmp + 1;
|
|
(*fieldp)->ref = false;
|
|
} else if (tmp[1] == '>') {
|
|
str = tmp + 2;
|
|
(*fieldp)->ref = true;
|
|
} else {
|
|
semantic_error("Argument parse error: %s\n",
|
|
str);
|
|
return -EINVAL;
|
|
}
|
|
tmp = strpbrk(str, "-.[");
|
|
}
|
|
if (tmp) {
|
|
(*fieldp)->name = strndup(str, tmp - str);
|
|
if ((*fieldp)->name == NULL)
|
|
return -ENOMEM;
|
|
if (*str != '[')
|
|
goodname = (*fieldp)->name;
|
|
pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
|
|
fieldp = &(*fieldp)->next;
|
|
}
|
|
} while (tmp);
|
|
(*fieldp)->name = strdup(str);
|
|
if ((*fieldp)->name == NULL)
|
|
return -ENOMEM;
|
|
if (*str != '[')
|
|
goodname = (*fieldp)->name;
|
|
pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
|
|
|
|
/* If no name is specified, set the last field name (not array index)*/
|
|
if (!arg->name) {
|
|
arg->name = strdup(goodname);
|
|
if (arg->name == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Parse perf-probe event command */
|
|
int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
|
|
{
|
|
char **argv;
|
|
int argc, i, ret = 0;
|
|
|
|
argv = argv_split(cmd, &argc);
|
|
if (!argv) {
|
|
pr_debug("Failed to split arguments.\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (argc - 1 > MAX_PROBE_ARGS) {
|
|
semantic_error("Too many probe arguments (%d).\n", argc - 1);
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
/* Parse probe point */
|
|
ret = parse_perf_probe_point(argv[0], pev);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Generate event name if needed */
|
|
if (!pev->event && pev->point.function && pev->point.line
|
|
&& !pev->point.lazy_line && !pev->point.offset) {
|
|
if (asprintf(&pev->event, "%s_L%d", pev->point.function,
|
|
pev->point.line) < 0) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Copy arguments and ensure return probe has no C argument */
|
|
pev->nargs = argc - 1;
|
|
pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
|
|
if (pev->args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
for (i = 0; i < pev->nargs && ret >= 0; i++) {
|
|
ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
|
|
if (ret >= 0 &&
|
|
is_c_varname(pev->args[i].var) && pev->point.retprobe) {
|
|
semantic_error("You can't specify local variable for"
|
|
" kretprobe.\n");
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
out:
|
|
argv_free(argv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Returns true if *any* ARG is either C variable, $params or $vars. */
|
|
bool perf_probe_with_var(struct perf_probe_event *pev)
|
|
{
|
|
int i = 0;
|
|
|
|
for (i = 0; i < pev->nargs; i++)
|
|
if (is_c_varname(pev->args[i].var) ||
|
|
!strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
|
|
!strcmp(pev->args[i].var, PROBE_ARG_VARS))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/* Return true if this perf_probe_event requires debuginfo */
|
|
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
|
|
{
|
|
if (pev->point.file || pev->point.line || pev->point.lazy_line)
|
|
return true;
|
|
|
|
if (perf_probe_with_var(pev))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Parse probe_events event into struct probe_point */
|
|
int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_point *tp = &tev->point;
|
|
char pr;
|
|
char *p;
|
|
char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
|
|
int ret, i, argc;
|
|
char **argv;
|
|
|
|
pr_debug("Parsing probe_events: %s\n", cmd);
|
|
argv = argv_split(cmd, &argc);
|
|
if (!argv) {
|
|
pr_debug("Failed to split arguments.\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (argc < 2) {
|
|
semantic_error("Too few probe arguments.\n");
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
|
|
/* Scan event and group name. */
|
|
argv0_str = strdup(argv[0]);
|
|
if (argv0_str == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
fmt1_str = strtok_r(argv0_str, ":", &fmt);
|
|
fmt2_str = strtok_r(NULL, "/", &fmt);
|
|
fmt3_str = strtok_r(NULL, " \t", &fmt);
|
|
if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
|
|
semantic_error("Failed to parse event name: %s\n", argv[0]);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
pr = fmt1_str[0];
|
|
tev->group = strdup(fmt2_str);
|
|
tev->event = strdup(fmt3_str);
|
|
if (tev->group == NULL || tev->event == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
|
|
|
|
tp->retprobe = (pr == 'r');
|
|
|
|
/* Scan module name(if there), function name and offset */
|
|
p = strchr(argv[1], ':');
|
|
if (p) {
|
|
tp->module = strndup(argv[1], p - argv[1]);
|
|
if (!tp->module) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
tev->uprobes = (tp->module[0] == '/');
|
|
p++;
|
|
} else
|
|
p = argv[1];
|
|
fmt1_str = strtok_r(p, "+", &fmt);
|
|
/* only the address started with 0x */
|
|
if (fmt1_str[0] == '0') {
|
|
/*
|
|
* Fix a special case:
|
|
* if address == 0, kernel reports something like:
|
|
* p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
|
|
* Newer kernel may fix that, but we want to
|
|
* support old kernel also.
|
|
*/
|
|
if (strcmp(fmt1_str, "0x") == 0) {
|
|
if (!argv[2] || strcmp(argv[2], "(null)")) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
tp->address = 0;
|
|
|
|
free(argv[2]);
|
|
for (i = 2; argv[i + 1] != NULL; i++)
|
|
argv[i] = argv[i + 1];
|
|
|
|
argv[i] = NULL;
|
|
argc -= 1;
|
|
} else
|
|
tp->address = strtoull(fmt1_str, NULL, 0);
|
|
} else {
|
|
/* Only the symbol-based probe has offset */
|
|
tp->symbol = strdup(fmt1_str);
|
|
if (tp->symbol == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
fmt2_str = strtok_r(NULL, "", &fmt);
|
|
if (fmt2_str == NULL)
|
|
tp->offset = 0;
|
|
else
|
|
tp->offset = strtoul(fmt2_str, NULL, 10);
|
|
}
|
|
|
|
if (tev->uprobes) {
|
|
fmt2_str = strchr(p, '(');
|
|
if (fmt2_str)
|
|
tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0);
|
|
}
|
|
|
|
tev->nargs = argc - 2;
|
|
tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
|
|
if (tev->args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
p = strchr(argv[i + 2], '=');
|
|
if (p) /* We don't need which register is assigned. */
|
|
*p++ = '\0';
|
|
else
|
|
p = argv[i + 2];
|
|
tev->args[i].name = strdup(argv[i + 2]);
|
|
/* TODO: parse regs and offset */
|
|
tev->args[i].value = strdup(p);
|
|
if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
free(argv0_str);
|
|
argv_free(argv);
|
|
return ret;
|
|
}
|
|
|
|
/* Compose only probe arg */
|
|
char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
|
|
{
|
|
struct perf_probe_arg_field *field = pa->field;
|
|
struct strbuf buf;
|
|
char *ret = NULL;
|
|
int err;
|
|
|
|
if (strbuf_init(&buf, 64) < 0)
|
|
return NULL;
|
|
|
|
if (pa->name && pa->var)
|
|
err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
|
|
else
|
|
err = strbuf_addstr(&buf, pa->name ?: pa->var);
|
|
if (err)
|
|
goto out;
|
|
|
|
while (field) {
|
|
if (field->name[0] == '[')
|
|
err = strbuf_addstr(&buf, field->name);
|
|
else
|
|
err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
|
|
field->name);
|
|
field = field->next;
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
if (pa->type)
|
|
if (strbuf_addf(&buf, ":%s", pa->type) < 0)
|
|
goto out;
|
|
|
|
ret = strbuf_detach(&buf, NULL);
|
|
out:
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Compose only probe point (not argument) */
|
|
char *synthesize_perf_probe_point(struct perf_probe_point *pp)
|
|
{
|
|
struct strbuf buf;
|
|
char *tmp, *ret = NULL;
|
|
int len, err = 0;
|
|
|
|
if (strbuf_init(&buf, 64) < 0)
|
|
return NULL;
|
|
|
|
if (pp->function) {
|
|
if (strbuf_addstr(&buf, pp->function) < 0)
|
|
goto out;
|
|
if (pp->offset)
|
|
err = strbuf_addf(&buf, "+%lu", pp->offset);
|
|
else if (pp->line)
|
|
err = strbuf_addf(&buf, ":%d", pp->line);
|
|
else if (pp->retprobe)
|
|
err = strbuf_addstr(&buf, "%return");
|
|
if (err)
|
|
goto out;
|
|
}
|
|
if (pp->file) {
|
|
tmp = pp->file;
|
|
len = strlen(tmp);
|
|
if (len > 30) {
|
|
tmp = strchr(pp->file + len - 30, '/');
|
|
tmp = tmp ? tmp + 1 : pp->file + len - 30;
|
|
}
|
|
err = strbuf_addf(&buf, "@%s", tmp);
|
|
if (!err && !pp->function && pp->line)
|
|
err = strbuf_addf(&buf, ":%d", pp->line);
|
|
}
|
|
if (!err)
|
|
ret = strbuf_detach(&buf, NULL);
|
|
out:
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
|
|
{
|
|
struct strbuf buf;
|
|
char *tmp, *ret = NULL;
|
|
int i;
|
|
|
|
if (strbuf_init(&buf, 64))
|
|
return NULL;
|
|
if (pev->event)
|
|
if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
|
|
pev->event) < 0)
|
|
goto out;
|
|
|
|
tmp = synthesize_perf_probe_point(&pev->point);
|
|
if (!tmp || strbuf_addstr(&buf, tmp) < 0)
|
|
goto out;
|
|
free(tmp);
|
|
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
tmp = synthesize_perf_probe_arg(pev->args + i);
|
|
if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
|
|
goto out;
|
|
free(tmp);
|
|
}
|
|
|
|
ret = strbuf_detach(&buf, NULL);
|
|
out:
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
|
|
struct strbuf *buf, int depth)
|
|
{
|
|
int err;
|
|
if (ref->next) {
|
|
depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
|
|
depth + 1);
|
|
if (depth < 0)
|
|
return depth;
|
|
}
|
|
if (ref->user_access)
|
|
err = strbuf_addf(buf, "%s%ld(", "+u", ref->offset);
|
|
else
|
|
err = strbuf_addf(buf, "%+ld(", ref->offset);
|
|
return (err < 0) ? err : depth;
|
|
}
|
|
|
|
static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
|
|
struct strbuf *buf)
|
|
{
|
|
struct probe_trace_arg_ref *ref = arg->ref;
|
|
int depth = 0, err;
|
|
|
|
/* Argument name or separator */
|
|
if (arg->name)
|
|
err = strbuf_addf(buf, " %s=", arg->name);
|
|
else
|
|
err = strbuf_addch(buf, ' ');
|
|
if (err)
|
|
return err;
|
|
|
|
/* Special case: @XXX */
|
|
if (arg->value[0] == '@' && arg->ref)
|
|
ref = ref->next;
|
|
|
|
/* Dereferencing arguments */
|
|
if (ref) {
|
|
depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
|
|
if (depth < 0)
|
|
return depth;
|
|
}
|
|
|
|
/* Print argument value */
|
|
if (arg->value[0] == '@' && arg->ref)
|
|
err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
|
|
else
|
|
err = strbuf_addstr(buf, arg->value);
|
|
|
|
/* Closing */
|
|
while (!err && depth--)
|
|
err = strbuf_addch(buf, ')');
|
|
|
|
/* Print argument type */
|
|
if (!err && arg->type)
|
|
err = strbuf_addf(buf, ":%s", arg->type);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
synthesize_probe_trace_args(struct probe_trace_event *tev, struct strbuf *buf)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
for (i = 0; i < tev->nargs && ret >= 0; i++)
|
|
ret = synthesize_probe_trace_arg(&tev->args[i], buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
synthesize_uprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf)
|
|
{
|
|
int err;
|
|
|
|
/* Uprobes must have tp->module */
|
|
if (!tp->module)
|
|
return -EINVAL;
|
|
/*
|
|
* If tp->address == 0, then this point must be a
|
|
* absolute address uprobe.
|
|
* try_to_find_absolute_address() should have made
|
|
* tp->symbol to "0x0".
|
|
*/
|
|
if (!tp->address && (!tp->symbol || strcmp(tp->symbol, "0x0")))
|
|
return -EINVAL;
|
|
|
|
/* Use the tp->address for uprobes */
|
|
err = strbuf_addf(buf, "%s:0x%" PRIx64, tp->module, tp->address);
|
|
|
|
if (err >= 0 && tp->ref_ctr_offset) {
|
|
if (!uprobe_ref_ctr_is_supported())
|
|
return -EINVAL;
|
|
err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
|
|
}
|
|
return err >= 0 ? 0 : err;
|
|
}
|
|
|
|
static int
|
|
synthesize_kprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf)
|
|
{
|
|
if (!strncmp(tp->symbol, "0x", 2)) {
|
|
/* Absolute address. See try_to_find_absolute_address() */
|
|
return strbuf_addf(buf, "%s%s0x%" PRIx64, tp->module ?: "",
|
|
tp->module ? ":" : "", tp->address);
|
|
} else {
|
|
return strbuf_addf(buf, "%s%s%s+%lu", tp->module ?: "",
|
|
tp->module ? ":" : "", tp->symbol, tp->offset);
|
|
}
|
|
}
|
|
|
|
char *synthesize_probe_trace_command(struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_point *tp = &tev->point;
|
|
struct strbuf buf;
|
|
char *ret = NULL;
|
|
int err;
|
|
|
|
if (strbuf_init(&buf, 32) < 0)
|
|
return NULL;
|
|
|
|
if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
|
|
tev->group, tev->event) < 0)
|
|
goto error;
|
|
|
|
if (tev->uprobes)
|
|
err = synthesize_uprobe_trace_def(tp, &buf);
|
|
else
|
|
err = synthesize_kprobe_trace_def(tp, &buf);
|
|
|
|
if (err >= 0)
|
|
err = synthesize_probe_trace_args(tev, &buf);
|
|
|
|
if (err >= 0)
|
|
ret = strbuf_detach(&buf, NULL);
|
|
error:
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
|
|
struct perf_probe_point *pp,
|
|
bool is_kprobe)
|
|
{
|
|
struct symbol *sym = NULL;
|
|
struct map *map = NULL;
|
|
u64 addr = tp->address;
|
|
int ret = -ENOENT;
|
|
|
|
if (!is_kprobe) {
|
|
map = dso__new_map(tp->module);
|
|
if (!map)
|
|
goto out;
|
|
sym = map__find_symbol(map, addr);
|
|
} else {
|
|
if (tp->symbol && !addr) {
|
|
if (kernel_get_symbol_address_by_name(tp->symbol,
|
|
&addr, true, false) < 0)
|
|
goto out;
|
|
}
|
|
if (addr) {
|
|
addr += tp->offset;
|
|
sym = machine__find_kernel_symbol(host_machine, addr, &map);
|
|
}
|
|
}
|
|
|
|
if (!sym)
|
|
goto out;
|
|
|
|
pp->retprobe = tp->retprobe;
|
|
pp->offset = addr - map__unmap_ip(map, sym->start);
|
|
pp->function = strdup(sym->name);
|
|
ret = pp->function ? 0 : -ENOMEM;
|
|
|
|
out:
|
|
if (map && !is_kprobe) {
|
|
map__put(map);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int convert_to_perf_probe_point(struct probe_trace_point *tp,
|
|
struct perf_probe_point *pp,
|
|
bool is_kprobe)
|
|
{
|
|
char buf[128];
|
|
int ret;
|
|
|
|
ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
|
|
if (!ret)
|
|
return 0;
|
|
ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
pr_debug("Failed to find probe point from both of dwarf and map.\n");
|
|
|
|
if (tp->symbol) {
|
|
pp->function = strdup(tp->symbol);
|
|
pp->offset = tp->offset;
|
|
} else {
|
|
ret = e_snprintf(buf, 128, "0x%" PRIx64, tp->address);
|
|
if (ret < 0)
|
|
return ret;
|
|
pp->function = strdup(buf);
|
|
pp->offset = 0;
|
|
}
|
|
if (pp->function == NULL)
|
|
return -ENOMEM;
|
|
|
|
pp->retprobe = tp->retprobe;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int convert_to_perf_probe_event(struct probe_trace_event *tev,
|
|
struct perf_probe_event *pev, bool is_kprobe)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int i, ret;
|
|
|
|
/* Convert event/group name */
|
|
pev->event = strdup(tev->event);
|
|
pev->group = strdup(tev->group);
|
|
if (pev->event == NULL || pev->group == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Convert trace_point to probe_point */
|
|
ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Convert trace_arg to probe_arg */
|
|
pev->nargs = tev->nargs;
|
|
pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
|
|
if (pev->args == NULL)
|
|
return -ENOMEM;
|
|
for (i = 0; i < tev->nargs && ret >= 0; i++) {
|
|
if (tev->args[i].name)
|
|
pev->args[i].name = strdup(tev->args[i].name);
|
|
else {
|
|
if ((ret = strbuf_init(&buf, 32)) < 0)
|
|
goto error;
|
|
ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
|
|
pev->args[i].name = strbuf_detach(&buf, NULL);
|
|
}
|
|
if (pev->args[i].name == NULL && ret >= 0)
|
|
ret = -ENOMEM;
|
|
}
|
|
error:
|
|
if (ret < 0)
|
|
clear_perf_probe_event(pev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void clear_perf_probe_event(struct perf_probe_event *pev)
|
|
{
|
|
struct perf_probe_arg_field *field, *next;
|
|
int i;
|
|
|
|
zfree(&pev->event);
|
|
zfree(&pev->group);
|
|
zfree(&pev->target);
|
|
clear_perf_probe_point(&pev->point);
|
|
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
zfree(&pev->args[i].name);
|
|
zfree(&pev->args[i].var);
|
|
zfree(&pev->args[i].type);
|
|
field = pev->args[i].field;
|
|
while (field) {
|
|
next = field->next;
|
|
zfree(&field->name);
|
|
free(field);
|
|
field = next;
|
|
}
|
|
}
|
|
pev->nargs = 0;
|
|
zfree(&pev->args);
|
|
}
|
|
|
|
#define strdup_or_goto(str, label) \
|
|
({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
|
|
|
|
static int perf_probe_point__copy(struct perf_probe_point *dst,
|
|
struct perf_probe_point *src)
|
|
{
|
|
dst->file = strdup_or_goto(src->file, out_err);
|
|
dst->function = strdup_or_goto(src->function, out_err);
|
|
dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
|
|
dst->line = src->line;
|
|
dst->retprobe = src->retprobe;
|
|
dst->offset = src->offset;
|
|
return 0;
|
|
|
|
out_err:
|
|
clear_perf_probe_point(dst);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int perf_probe_arg__copy(struct perf_probe_arg *dst,
|
|
struct perf_probe_arg *src)
|
|
{
|
|
struct perf_probe_arg_field *field, **ppfield;
|
|
|
|
dst->name = strdup_or_goto(src->name, out_err);
|
|
dst->var = strdup_or_goto(src->var, out_err);
|
|
dst->type = strdup_or_goto(src->type, out_err);
|
|
|
|
field = src->field;
|
|
ppfield = &(dst->field);
|
|
while (field) {
|
|
*ppfield = zalloc(sizeof(*field));
|
|
if (!*ppfield)
|
|
goto out_err;
|
|
(*ppfield)->name = strdup_or_goto(field->name, out_err);
|
|
(*ppfield)->index = field->index;
|
|
(*ppfield)->ref = field->ref;
|
|
field = field->next;
|
|
ppfield = &((*ppfield)->next);
|
|
}
|
|
return 0;
|
|
out_err:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int perf_probe_event__copy(struct perf_probe_event *dst,
|
|
struct perf_probe_event *src)
|
|
{
|
|
int i;
|
|
|
|
dst->event = strdup_or_goto(src->event, out_err);
|
|
dst->group = strdup_or_goto(src->group, out_err);
|
|
dst->target = strdup_or_goto(src->target, out_err);
|
|
dst->uprobes = src->uprobes;
|
|
|
|
if (perf_probe_point__copy(&dst->point, &src->point) < 0)
|
|
goto out_err;
|
|
|
|
dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
|
|
if (!dst->args)
|
|
goto out_err;
|
|
dst->nargs = src->nargs;
|
|
|
|
for (i = 0; i < src->nargs; i++)
|
|
if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
|
|
goto out_err;
|
|
return 0;
|
|
|
|
out_err:
|
|
clear_perf_probe_event(dst);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void clear_probe_trace_event(struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_arg_ref *ref, *next;
|
|
int i;
|
|
|
|
zfree(&tev->event);
|
|
zfree(&tev->group);
|
|
zfree(&tev->point.symbol);
|
|
zfree(&tev->point.realname);
|
|
zfree(&tev->point.module);
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
zfree(&tev->args[i].name);
|
|
zfree(&tev->args[i].value);
|
|
zfree(&tev->args[i].type);
|
|
ref = tev->args[i].ref;
|
|
while (ref) {
|
|
next = ref->next;
|
|
free(ref);
|
|
ref = next;
|
|
}
|
|
}
|
|
zfree(&tev->args);
|
|
tev->nargs = 0;
|
|
}
|
|
|
|
struct kprobe_blacklist_node {
|
|
struct list_head list;
|
|
u64 start;
|
|
u64 end;
|
|
char *symbol;
|
|
};
|
|
|
|
static void kprobe_blacklist__delete(struct list_head *blacklist)
|
|
{
|
|
struct kprobe_blacklist_node *node;
|
|
|
|
while (!list_empty(blacklist)) {
|
|
node = list_first_entry(blacklist,
|
|
struct kprobe_blacklist_node, list);
|
|
list_del_init(&node->list);
|
|
zfree(&node->symbol);
|
|
free(node);
|
|
}
|
|
}
|
|
|
|
static int kprobe_blacklist__load(struct list_head *blacklist)
|
|
{
|
|
struct kprobe_blacklist_node *node;
|
|
const char *__debugfs = debugfs__mountpoint();
|
|
char buf[PATH_MAX], *p;
|
|
FILE *fp;
|
|
int ret;
|
|
|
|
if (__debugfs == NULL)
|
|
return -ENOTSUP;
|
|
|
|
ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
fp = fopen(buf, "r");
|
|
if (!fp)
|
|
return -errno;
|
|
|
|
ret = 0;
|
|
while (fgets(buf, PATH_MAX, fp)) {
|
|
node = zalloc(sizeof(*node));
|
|
if (!node) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
INIT_LIST_HEAD(&node->list);
|
|
list_add_tail(&node->list, blacklist);
|
|
if (sscanf(buf, "0x%" PRIx64 "-0x%" PRIx64, &node->start, &node->end) != 2) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
p = strchr(buf, '\t');
|
|
if (p) {
|
|
p++;
|
|
if (p[strlen(p) - 1] == '\n')
|
|
p[strlen(p) - 1] = '\0';
|
|
} else
|
|
p = (char *)"unknown";
|
|
node->symbol = strdup(p);
|
|
if (!node->symbol) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
pr_debug2("Blacklist: 0x%" PRIx64 "-0x%" PRIx64 ", %s\n",
|
|
node->start, node->end, node->symbol);
|
|
ret++;
|
|
}
|
|
if (ret < 0)
|
|
kprobe_blacklist__delete(blacklist);
|
|
fclose(fp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct kprobe_blacklist_node *
|
|
kprobe_blacklist__find_by_address(struct list_head *blacklist, u64 address)
|
|
{
|
|
struct kprobe_blacklist_node *node;
|
|
|
|
list_for_each_entry(node, blacklist, list) {
|
|
if (node->start <= address && address < node->end)
|
|
return node;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static LIST_HEAD(kprobe_blacklist);
|
|
|
|
static void kprobe_blacklist__init(void)
|
|
{
|
|
if (!list_empty(&kprobe_blacklist))
|
|
return;
|
|
|
|
if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
|
|
pr_debug("No kprobe blacklist support, ignored\n");
|
|
}
|
|
|
|
static void kprobe_blacklist__release(void)
|
|
{
|
|
kprobe_blacklist__delete(&kprobe_blacklist);
|
|
}
|
|
|
|
static bool kprobe_blacklist__listed(u64 address)
|
|
{
|
|
return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
|
|
}
|
|
|
|
static int perf_probe_event__sprintf(const char *group, const char *event,
|
|
struct perf_probe_event *pev,
|
|
const char *module,
|
|
struct strbuf *result)
|
|
{
|
|
int i, ret;
|
|
char *buf;
|
|
|
|
if (asprintf(&buf, "%s:%s", group, event) < 0)
|
|
return -errno;
|
|
ret = strbuf_addf(result, " %-20s (on ", buf);
|
|
free(buf);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Synthesize only event probe point */
|
|
buf = synthesize_perf_probe_point(&pev->point);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
ret = strbuf_addstr(result, buf);
|
|
free(buf);
|
|
|
|
if (!ret && module)
|
|
ret = strbuf_addf(result, " in %s", module);
|
|
|
|
if (!ret && pev->nargs > 0) {
|
|
ret = strbuf_add(result, " with", 5);
|
|
for (i = 0; !ret && i < pev->nargs; i++) {
|
|
buf = synthesize_perf_probe_arg(&pev->args[i]);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
ret = strbuf_addf(result, " %s", buf);
|
|
free(buf);
|
|
}
|
|
}
|
|
if (!ret)
|
|
ret = strbuf_addch(result, ')');
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Show an event */
|
|
int show_perf_probe_event(const char *group, const char *event,
|
|
struct perf_probe_event *pev,
|
|
const char *module, bool use_stdout)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret;
|
|
|
|
ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
|
|
if (ret >= 0) {
|
|
if (use_stdout)
|
|
printf("%s\n", buf.buf);
|
|
else
|
|
pr_info("%s\n", buf.buf);
|
|
}
|
|
strbuf_release(&buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool filter_probe_trace_event(struct probe_trace_event *tev,
|
|
struct strfilter *filter)
|
|
{
|
|
char tmp[128];
|
|
|
|
/* At first, check the event name itself */
|
|
if (strfilter__compare(filter, tev->event))
|
|
return true;
|
|
|
|
/* Next, check the combination of name and group */
|
|
if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
|
|
return false;
|
|
return strfilter__compare(filter, tmp);
|
|
}
|
|
|
|
static int __show_perf_probe_events(int fd, bool is_kprobe,
|
|
struct strfilter *filter)
|
|
{
|
|
int ret = 0;
|
|
struct probe_trace_event tev;
|
|
struct perf_probe_event pev;
|
|
struct strlist *rawlist;
|
|
struct str_node *ent;
|
|
|
|
memset(&tev, 0, sizeof(tev));
|
|
memset(&pev, 0, sizeof(pev));
|
|
|
|
rawlist = probe_file__get_rawlist(fd);
|
|
if (!rawlist)
|
|
return -ENOMEM;
|
|
|
|
strlist__for_each_entry(ent, rawlist) {
|
|
ret = parse_probe_trace_command(ent->s, &tev);
|
|
if (ret >= 0) {
|
|
if (!filter_probe_trace_event(&tev, filter))
|
|
goto next;
|
|
ret = convert_to_perf_probe_event(&tev, &pev,
|
|
is_kprobe);
|
|
if (ret < 0)
|
|
goto next;
|
|
ret = show_perf_probe_event(pev.group, pev.event,
|
|
&pev, tev.point.module,
|
|
true);
|
|
}
|
|
next:
|
|
clear_perf_probe_event(&pev);
|
|
clear_probe_trace_event(&tev);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
strlist__delete(rawlist);
|
|
/* Cleanup cached debuginfo if needed */
|
|
debuginfo_cache__exit();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* List up current perf-probe events */
|
|
int show_perf_probe_events(struct strfilter *filter)
|
|
{
|
|
int kp_fd, up_fd, ret;
|
|
|
|
setup_pager();
|
|
|
|
if (probe_conf.cache)
|
|
return probe_cache__show_all_caches(filter);
|
|
|
|
ret = init_probe_symbol_maps(false);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = probe_file__open_both(&kp_fd, &up_fd, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (kp_fd >= 0)
|
|
ret = __show_perf_probe_events(kp_fd, true, filter);
|
|
if (up_fd >= 0 && ret >= 0)
|
|
ret = __show_perf_probe_events(up_fd, false, filter);
|
|
if (kp_fd > 0)
|
|
close(kp_fd);
|
|
if (up_fd > 0)
|
|
close(up_fd);
|
|
exit_probe_symbol_maps();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int get_new_event_name(char *buf, size_t len, const char *base,
|
|
struct strlist *namelist, bool ret_event,
|
|
bool allow_suffix)
|
|
{
|
|
int i, ret;
|
|
char *p, *nbase;
|
|
|
|
if (*base == '.')
|
|
base++;
|
|
nbase = strdup(base);
|
|
if (!nbase)
|
|
return -ENOMEM;
|
|
|
|
/* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
|
|
p = strpbrk(nbase, ".@");
|
|
if (p && p != nbase)
|
|
*p = '\0';
|
|
|
|
/* Try no suffix number */
|
|
ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
|
|
if (ret < 0) {
|
|
pr_debug("snprintf() failed: %d\n", ret);
|
|
goto out;
|
|
}
|
|
if (!strlist__has_entry(namelist, buf))
|
|
goto out;
|
|
|
|
if (!allow_suffix) {
|
|
pr_warning("Error: event \"%s\" already exists.\n"
|
|
" Hint: Remove existing event by 'perf probe -d'\n"
|
|
" or force duplicates by 'perf probe -f'\n"
|
|
" or set 'force=yes' in BPF source.\n",
|
|
buf);
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
/* Try to add suffix */
|
|
for (i = 1; i < MAX_EVENT_INDEX; i++) {
|
|
ret = e_snprintf(buf, len, "%s_%d", nbase, i);
|
|
if (ret < 0) {
|
|
pr_debug("snprintf() failed: %d\n", ret);
|
|
goto out;
|
|
}
|
|
if (!strlist__has_entry(namelist, buf))
|
|
break;
|
|
}
|
|
if (i == MAX_EVENT_INDEX) {
|
|
pr_warning("Too many events are on the same function.\n");
|
|
ret = -ERANGE;
|
|
}
|
|
|
|
out:
|
|
free(nbase);
|
|
|
|
/* Final validation */
|
|
if (ret >= 0 && !is_c_func_name(buf)) {
|
|
pr_warning("Internal error: \"%s\" is an invalid event name.\n",
|
|
buf);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Warn if the current kernel's uprobe implementation is old */
|
|
static void warn_uprobe_event_compat(struct probe_trace_event *tev)
|
|
{
|
|
int i;
|
|
char *buf = synthesize_probe_trace_command(tev);
|
|
struct probe_trace_point *tp = &tev->point;
|
|
|
|
if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) {
|
|
pr_warning("A semaphore is associated with %s:%s and "
|
|
"seems your kernel doesn't support it.\n",
|
|
tev->group, tev->event);
|
|
}
|
|
|
|
/* Old uprobe event doesn't support memory dereference */
|
|
if (!tev->uprobes || tev->nargs == 0 || !buf)
|
|
goto out;
|
|
|
|
for (i = 0; i < tev->nargs; i++)
|
|
if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
|
|
pr_warning("Please upgrade your kernel to at least "
|
|
"3.14 to have access to feature %s\n",
|
|
tev->args[i].value);
|
|
break;
|
|
}
|
|
out:
|
|
free(buf);
|
|
}
|
|
|
|
/* Set new name from original perf_probe_event and namelist */
|
|
static int probe_trace_event__set_name(struct probe_trace_event *tev,
|
|
struct perf_probe_event *pev,
|
|
struct strlist *namelist,
|
|
bool allow_suffix)
|
|
{
|
|
const char *event, *group;
|
|
char buf[64];
|
|
int ret;
|
|
|
|
/* If probe_event or trace_event already have the name, reuse it */
|
|
if (pev->event && !pev->sdt)
|
|
event = pev->event;
|
|
else if (tev->event)
|
|
event = tev->event;
|
|
else {
|
|
/* Or generate new one from probe point */
|
|
if (pev->point.function &&
|
|
(strncmp(pev->point.function, "0x", 2) != 0) &&
|
|
!strisglob(pev->point.function))
|
|
event = pev->point.function;
|
|
else
|
|
event = tev->point.realname;
|
|
}
|
|
if (pev->group && !pev->sdt)
|
|
group = pev->group;
|
|
else if (tev->group)
|
|
group = tev->group;
|
|
else
|
|
group = PERFPROBE_GROUP;
|
|
|
|
/* Get an unused new event name */
|
|
ret = get_new_event_name(buf, 64, event, namelist,
|
|
tev->point.retprobe, allow_suffix);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
event = buf;
|
|
|
|
tev->event = strdup(event);
|
|
tev->group = strdup(group);
|
|
if (tev->event == NULL || tev->group == NULL)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Add new event name to namelist if multiprobe event is NOT
|
|
* supported, since we have to use new event name for following
|
|
* probes in that case.
|
|
*/
|
|
if (!multiprobe_event_is_supported())
|
|
strlist__add(namelist, event);
|
|
return 0;
|
|
}
|
|
|
|
static int __open_probe_file_and_namelist(bool uprobe,
|
|
struct strlist **namelist)
|
|
{
|
|
int fd;
|
|
|
|
fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
/* Get current event names */
|
|
*namelist = probe_file__get_namelist(fd);
|
|
if (!(*namelist)) {
|
|
pr_debug("Failed to get current event list.\n");
|
|
close(fd);
|
|
return -ENOMEM;
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
static int __add_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event *tevs,
|
|
int ntevs, bool allow_suffix)
|
|
{
|
|
int i, fd[2] = {-1, -1}, up, ret;
|
|
struct probe_trace_event *tev = NULL;
|
|
struct probe_cache *cache = NULL;
|
|
struct strlist *namelist[2] = {NULL, NULL};
|
|
struct nscookie nsc;
|
|
|
|
up = pev->uprobes ? 1 : 0;
|
|
fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
|
|
if (fd[up] < 0)
|
|
return fd[up];
|
|
|
|
ret = 0;
|
|
for (i = 0; i < ntevs; i++) {
|
|
tev = &tevs[i];
|
|
up = tev->uprobes ? 1 : 0;
|
|
if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
|
|
fd[up] = __open_probe_file_and_namelist(up,
|
|
&namelist[up]);
|
|
if (fd[up] < 0)
|
|
goto close_out;
|
|
}
|
|
/* Skip if the symbol is out of .text or blacklisted */
|
|
if (!tev->point.symbol && !pev->uprobes)
|
|
continue;
|
|
|
|
/* Set new name for tev (and update namelist) */
|
|
ret = probe_trace_event__set_name(tev, pev, namelist[up],
|
|
allow_suffix);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
nsinfo__mountns_enter(pev->nsi, &nsc);
|
|
ret = probe_file__add_event(fd[up], tev);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
/*
|
|
* Probes after the first probe which comes from same
|
|
* user input are always allowed to add suffix, because
|
|
* there might be several addresses corresponding to
|
|
* one code line.
|
|
*/
|
|
allow_suffix = true;
|
|
}
|
|
if (ret == -EINVAL && pev->uprobes)
|
|
warn_uprobe_event_compat(tev);
|
|
if (ret == 0 && probe_conf.cache) {
|
|
cache = probe_cache__new(pev->target, pev->nsi);
|
|
if (!cache ||
|
|
probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
|
|
probe_cache__commit(cache) < 0)
|
|
pr_warning("Failed to add event to probe cache\n");
|
|
probe_cache__delete(cache);
|
|
}
|
|
|
|
close_out:
|
|
for (up = 0; up < 2; up++) {
|
|
strlist__delete(namelist[up]);
|
|
if (fd[up] >= 0)
|
|
close(fd[up]);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int find_probe_functions(struct map *map, char *name,
|
|
struct symbol **syms)
|
|
{
|
|
int found = 0;
|
|
struct symbol *sym;
|
|
struct rb_node *tmp;
|
|
const char *norm, *ver;
|
|
char *buf = NULL;
|
|
bool cut_version = true;
|
|
|
|
if (map__load(map) < 0)
|
|
return -EACCES; /* Possible permission error to load symbols */
|
|
|
|
/* If user gives a version, don't cut off the version from symbols */
|
|
if (strchr(name, '@'))
|
|
cut_version = false;
|
|
|
|
map__for_each_symbol(map, sym, tmp) {
|
|
norm = arch__normalize_symbol_name(sym->name);
|
|
if (!norm)
|
|
continue;
|
|
|
|
if (cut_version) {
|
|
/* We don't care about default symbol or not */
|
|
ver = strchr(norm, '@');
|
|
if (ver) {
|
|
buf = strndup(norm, ver - norm);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
norm = buf;
|
|
}
|
|
}
|
|
|
|
if (strglobmatch(norm, name)) {
|
|
found++;
|
|
if (syms && found < probe_conf.max_probes)
|
|
syms[found - 1] = sym;
|
|
}
|
|
if (buf)
|
|
zfree(&buf);
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
|
|
struct probe_trace_event *tev __maybe_unused,
|
|
struct map *map __maybe_unused,
|
|
struct symbol *sym __maybe_unused) { }
|
|
|
|
|
|
static void pr_kallsyms_access_error(void)
|
|
{
|
|
pr_err("Please ensure you can read the /proc/kallsyms symbol addresses.\n"
|
|
"If /proc/sys/kernel/kptr_restrict is '2', you can not read\n"
|
|
"kernel symbol addresses even if you are a superuser. Please change\n"
|
|
"it to '1'. If kptr_restrict is '1', the superuser can read the\n"
|
|
"symbol addresses.\n"
|
|
"In that case, please run this command again with sudo.\n");
|
|
}
|
|
|
|
/*
|
|
* Find probe function addresses from map.
|
|
* Return an error or the number of found probe_trace_event
|
|
*/
|
|
static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs)
|
|
{
|
|
struct map *map = NULL;
|
|
struct ref_reloc_sym *reloc_sym = NULL;
|
|
struct symbol *sym;
|
|
struct symbol **syms = NULL;
|
|
struct probe_trace_event *tev;
|
|
struct perf_probe_point *pp = &pev->point;
|
|
struct probe_trace_point *tp;
|
|
int num_matched_functions;
|
|
int ret, i, j, skipped = 0;
|
|
char *mod_name;
|
|
|
|
map = get_target_map(pev->target, pev->nsi, pev->uprobes);
|
|
if (!map) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
|
|
if (!syms) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Load matched symbols: Since the different local symbols may have
|
|
* same name but different addresses, this lists all the symbols.
|
|
*/
|
|
num_matched_functions = find_probe_functions(map, pp->function, syms);
|
|
if (num_matched_functions <= 0) {
|
|
if (num_matched_functions == -EACCES) {
|
|
pr_err("Failed to load symbols from %s\n",
|
|
pev->target ?: "/proc/kallsyms");
|
|
if (pev->target)
|
|
pr_err("Please ensure the file is not stripped.\n");
|
|
else
|
|
pr_kallsyms_access_error();
|
|
} else
|
|
pr_err("Failed to find symbol %s in %s\n", pp->function,
|
|
pev->target ? : "kernel");
|
|
ret = -ENOENT;
|
|
goto out;
|
|
} else if (num_matched_functions > probe_conf.max_probes) {
|
|
pr_err("Too many functions matched in %s\n",
|
|
pev->target ? : "kernel");
|
|
ret = -E2BIG;
|
|
goto out;
|
|
}
|
|
|
|
/* Note that the symbols in the kmodule are not relocated */
|
|
if (!pev->uprobes && !pev->target &&
|
|
(!pp->retprobe || kretprobe_offset_is_supported())) {
|
|
reloc_sym = kernel_get_ref_reloc_sym(NULL);
|
|
if (!reloc_sym) {
|
|
pr_warning("Relocated base symbol is not found! "
|
|
"Check /proc/sys/kernel/kptr_restrict\n"
|
|
"and /proc/sys/kernel/perf_event_paranoid. "
|
|
"Or run as privileged perf user.\n\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Setup result trace-probe-events */
|
|
*tevs = zalloc(sizeof(*tev) * num_matched_functions);
|
|
if (!*tevs) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
for (j = 0; j < num_matched_functions; j++) {
|
|
sym = syms[j];
|
|
|
|
if (sym->type != STT_FUNC)
|
|
continue;
|
|
|
|
/* There can be duplicated symbols in the map */
|
|
for (i = 0; i < j; i++)
|
|
if (sym->start == syms[i]->start) {
|
|
pr_debug("Found duplicated symbol %s @ %" PRIx64 "\n",
|
|
sym->name, sym->start);
|
|
break;
|
|
}
|
|
if (i != j)
|
|
continue;
|
|
|
|
tev = (*tevs) + ret;
|
|
tp = &tev->point;
|
|
if (ret == num_matched_functions) {
|
|
pr_warning("Too many symbols are listed. Skip it.\n");
|
|
break;
|
|
}
|
|
ret++;
|
|
|
|
if (pp->offset > sym->end - sym->start) {
|
|
pr_warning("Offset %ld is bigger than the size of %s\n",
|
|
pp->offset, sym->name);
|
|
ret = -ENOENT;
|
|
goto err_out;
|
|
}
|
|
/* Add one probe point */
|
|
tp->address = map__unmap_ip(map, sym->start) + pp->offset;
|
|
|
|
/* Check the kprobe (not in module) is within .text */
|
|
if (!pev->uprobes && !pev->target &&
|
|
kprobe_warn_out_range(sym->name, tp->address)) {
|
|
tp->symbol = NULL; /* Skip it */
|
|
skipped++;
|
|
} else if (reloc_sym) {
|
|
tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
|
|
tp->offset = tp->address - reloc_sym->addr;
|
|
} else {
|
|
tp->symbol = strdup_or_goto(sym->name, nomem_out);
|
|
tp->offset = pp->offset;
|
|
}
|
|
tp->realname = strdup_or_goto(sym->name, nomem_out);
|
|
|
|
tp->retprobe = pp->retprobe;
|
|
if (pev->target) {
|
|
if (pev->uprobes) {
|
|
tev->point.module = strdup_or_goto(pev->target,
|
|
nomem_out);
|
|
} else {
|
|
mod_name = find_module_name(pev->target);
|
|
tev->point.module =
|
|
strdup(mod_name ? mod_name : pev->target);
|
|
free(mod_name);
|
|
if (!tev->point.module)
|
|
goto nomem_out;
|
|
}
|
|
}
|
|
tev->uprobes = pev->uprobes;
|
|
tev->nargs = pev->nargs;
|
|
if (tev->nargs) {
|
|
tev->args = zalloc(sizeof(struct probe_trace_arg) *
|
|
tev->nargs);
|
|
if (tev->args == NULL)
|
|
goto nomem_out;
|
|
}
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
if (pev->args[i].name)
|
|
tev->args[i].name =
|
|
strdup_or_goto(pev->args[i].name,
|
|
nomem_out);
|
|
|
|
tev->args[i].value = strdup_or_goto(pev->args[i].var,
|
|
nomem_out);
|
|
if (pev->args[i].type)
|
|
tev->args[i].type =
|
|
strdup_or_goto(pev->args[i].type,
|
|
nomem_out);
|
|
}
|
|
arch__fix_tev_from_maps(pev, tev, map, sym);
|
|
}
|
|
if (ret == skipped) {
|
|
ret = -ENOENT;
|
|
goto err_out;
|
|
}
|
|
|
|
out:
|
|
map__put(map);
|
|
free(syms);
|
|
return ret;
|
|
|
|
nomem_out:
|
|
ret = -ENOMEM;
|
|
err_out:
|
|
clear_probe_trace_events(*tevs, num_matched_functions);
|
|
zfree(tevs);
|
|
goto out;
|
|
}
|
|
|
|
static int try_to_find_absolute_address(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs)
|
|
{
|
|
struct perf_probe_point *pp = &pev->point;
|
|
struct probe_trace_event *tev;
|
|
struct probe_trace_point *tp;
|
|
int i, err;
|
|
|
|
if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
|
|
return -EINVAL;
|
|
if (perf_probe_event_need_dwarf(pev))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
|
|
* absolute address.
|
|
*
|
|
* Only one tev can be generated by this.
|
|
*/
|
|
*tevs = zalloc(sizeof(*tev));
|
|
if (!*tevs)
|
|
return -ENOMEM;
|
|
|
|
tev = *tevs;
|
|
tp = &tev->point;
|
|
|
|
/*
|
|
* Don't use tp->offset, use address directly, because
|
|
* in synthesize_probe_trace_command() address cannot be
|
|
* zero.
|
|
*/
|
|
tp->address = pev->point.abs_address;
|
|
tp->retprobe = pp->retprobe;
|
|
tev->uprobes = pev->uprobes;
|
|
|
|
err = -ENOMEM;
|
|
/*
|
|
* Give it a '0x' leading symbol name.
|
|
* In __add_probe_trace_events, a NULL symbol is interpreted as
|
|
* invalid.
|
|
*/
|
|
if (asprintf(&tp->symbol, "0x%" PRIx64, tp->address) < 0)
|
|
goto errout;
|
|
|
|
/* For kprobe, check range */
|
|
if ((!tev->uprobes) &&
|
|
(kprobe_warn_out_range(tev->point.symbol,
|
|
tev->point.address))) {
|
|
err = -EACCES;
|
|
goto errout;
|
|
}
|
|
|
|
if (asprintf(&tp->realname, "abs_%" PRIx64, tp->address) < 0)
|
|
goto errout;
|
|
|
|
if (pev->target) {
|
|
tp->module = strdup(pev->target);
|
|
if (!tp->module)
|
|
goto errout;
|
|
}
|
|
|
|
if (tev->group) {
|
|
tev->group = strdup(pev->group);
|
|
if (!tev->group)
|
|
goto errout;
|
|
}
|
|
|
|
if (pev->event) {
|
|
tev->event = strdup(pev->event);
|
|
if (!tev->event)
|
|
goto errout;
|
|
}
|
|
|
|
tev->nargs = pev->nargs;
|
|
tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
|
|
if (!tev->args)
|
|
goto errout;
|
|
|
|
for (i = 0; i < tev->nargs; i++)
|
|
copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
|
|
|
|
return 1;
|
|
|
|
errout:
|
|
clear_probe_trace_events(*tevs, 1);
|
|
*tevs = NULL;
|
|
return err;
|
|
}
|
|
|
|
/* Concatenate two arrays */
|
|
static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
|
|
{
|
|
void *ret;
|
|
|
|
ret = malloc(sz_a + sz_b);
|
|
if (ret) {
|
|
memcpy(ret, a, sz_a);
|
|
memcpy(ret + sz_a, b, sz_b);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
|
|
struct probe_trace_event **tevs2, int ntevs2)
|
|
{
|
|
struct probe_trace_event *new_tevs;
|
|
int ret = 0;
|
|
|
|
if (*ntevs == 0) {
|
|
*tevs = *tevs2;
|
|
*ntevs = ntevs2;
|
|
*tevs2 = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (*ntevs + ntevs2 > probe_conf.max_probes)
|
|
ret = -E2BIG;
|
|
else {
|
|
/* Concatenate the array of probe_trace_event */
|
|
new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
|
|
*tevs2, ntevs2 * sizeof(**tevs2));
|
|
if (!new_tevs)
|
|
ret = -ENOMEM;
|
|
else {
|
|
free(*tevs);
|
|
*tevs = new_tevs;
|
|
*ntevs += ntevs2;
|
|
}
|
|
}
|
|
if (ret < 0)
|
|
clear_probe_trace_events(*tevs2, ntevs2);
|
|
zfree(tevs2);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Try to find probe_trace_event from given probe caches. Return the number
|
|
* of cached events found, if an error occurs return the error.
|
|
*/
|
|
static int find_cached_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs,
|
|
const char *target)
|
|
{
|
|
struct probe_cache *cache;
|
|
struct probe_cache_entry *entry;
|
|
struct probe_trace_event *tmp_tevs = NULL;
|
|
int ntevs = 0;
|
|
int ret = 0;
|
|
|
|
cache = probe_cache__new(target, pev->nsi);
|
|
/* Return 0 ("not found") if the target has no probe cache. */
|
|
if (!cache)
|
|
return 0;
|
|
|
|
for_each_probe_cache_entry(entry, cache) {
|
|
/* Skip the cache entry which has no name */
|
|
if (!entry->pev.event || !entry->pev.group)
|
|
continue;
|
|
if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
|
|
strglobmatch(entry->pev.event, pev->event)) {
|
|
ret = probe_cache_entry__get_event(entry, &tmp_tevs);
|
|
if (ret > 0)
|
|
ret = concat_probe_trace_events(tevs, &ntevs,
|
|
&tmp_tevs, ret);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
}
|
|
probe_cache__delete(cache);
|
|
if (ret < 0) {
|
|
clear_probe_trace_events(*tevs, ntevs);
|
|
zfree(tevs);
|
|
} else {
|
|
ret = ntevs;
|
|
if (ntevs > 0 && target && target[0] == '/')
|
|
pev->uprobes = true;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Try to find probe_trace_event from all probe caches */
|
|
static int find_cached_events_all(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs)
|
|
{
|
|
struct probe_trace_event *tmp_tevs = NULL;
|
|
struct strlist *bidlist;
|
|
struct str_node *nd;
|
|
char *pathname;
|
|
int ntevs = 0;
|
|
int ret;
|
|
|
|
/* Get the buildid list of all valid caches */
|
|
bidlist = build_id_cache__list_all(true);
|
|
if (!bidlist) {
|
|
ret = -errno;
|
|
pr_debug("Failed to get buildids: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = 0;
|
|
strlist__for_each_entry(nd, bidlist) {
|
|
pathname = build_id_cache__origname(nd->s);
|
|
ret = find_cached_events(pev, &tmp_tevs, pathname);
|
|
/* In the case of cnt == 0, we just skip it */
|
|
if (ret > 0)
|
|
ret = concat_probe_trace_events(tevs, &ntevs,
|
|
&tmp_tevs, ret);
|
|
free(pathname);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
strlist__delete(bidlist);
|
|
|
|
if (ret < 0) {
|
|
clear_probe_trace_events(*tevs, ntevs);
|
|
zfree(tevs);
|
|
} else
|
|
ret = ntevs;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs)
|
|
{
|
|
struct probe_cache *cache;
|
|
struct probe_cache_entry *entry;
|
|
struct probe_trace_event *tev;
|
|
struct str_node *node;
|
|
int ret, i;
|
|
|
|
if (pev->sdt) {
|
|
/* For SDT/cached events, we use special search functions */
|
|
if (!pev->target)
|
|
return find_cached_events_all(pev, tevs);
|
|
else
|
|
return find_cached_events(pev, tevs, pev->target);
|
|
}
|
|
cache = probe_cache__new(pev->target, pev->nsi);
|
|
if (!cache)
|
|
return 0;
|
|
|
|
entry = probe_cache__find(cache, pev);
|
|
if (!entry) {
|
|
/* SDT must be in the cache */
|
|
ret = pev->sdt ? -ENOENT : 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = strlist__nr_entries(entry->tevlist);
|
|
if (ret > probe_conf.max_probes) {
|
|
pr_debug("Too many entries matched in the cache of %s\n",
|
|
pev->target ? : "kernel");
|
|
ret = -E2BIG;
|
|
goto out;
|
|
}
|
|
|
|
*tevs = zalloc(ret * sizeof(*tev));
|
|
if (!*tevs) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
i = 0;
|
|
strlist__for_each_entry(node, entry->tevlist) {
|
|
tev = &(*tevs)[i++];
|
|
ret = parse_probe_trace_command(node->s, tev);
|
|
if (ret < 0)
|
|
goto out;
|
|
/* Set the uprobes attribute as same as original */
|
|
tev->uprobes = pev->uprobes;
|
|
}
|
|
ret = i;
|
|
|
|
out:
|
|
probe_cache__delete(cache);
|
|
return ret;
|
|
}
|
|
|
|
static int convert_to_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs)
|
|
{
|
|
int ret;
|
|
|
|
if (!pev->group && !pev->sdt) {
|
|
/* Set group name if not given */
|
|
if (!pev->uprobes) {
|
|
pev->group = strdup(PERFPROBE_GROUP);
|
|
ret = pev->group ? 0 : -ENOMEM;
|
|
} else
|
|
ret = convert_exec_to_group(pev->target, &pev->group);
|
|
if (ret != 0) {
|
|
pr_warning("Failed to make a group name.\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = try_to_find_absolute_address(pev, tevs);
|
|
if (ret > 0)
|
|
return ret;
|
|
|
|
/* At first, we need to lookup cache entry */
|
|
ret = find_probe_trace_events_from_cache(pev, tevs);
|
|
if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
|
|
return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
|
|
|
|
/* Convert perf_probe_event with debuginfo */
|
|
ret = try_to_find_probe_trace_events(pev, tevs);
|
|
if (ret != 0)
|
|
return ret; /* Found in debuginfo or got an error */
|
|
|
|
return find_probe_trace_events_from_map(pev, tevs);
|
|
}
|
|
|
|
int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
|
|
{
|
|
int i, ret;
|
|
|
|
/* Loop 1: convert all events */
|
|
for (i = 0; i < npevs; i++) {
|
|
/* Init kprobe blacklist if needed */
|
|
if (!pevs[i].uprobes)
|
|
kprobe_blacklist__init();
|
|
/* Convert with or without debuginfo */
|
|
ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
|
|
if (ret < 0)
|
|
return ret;
|
|
pevs[i].ntevs = ret;
|
|
}
|
|
/* This just release blacklist only if allocated */
|
|
kprobe_blacklist__release();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int show_probe_trace_event(struct probe_trace_event *tev)
|
|
{
|
|
char *buf = synthesize_probe_trace_command(tev);
|
|
|
|
if (!buf) {
|
|
pr_debug("Failed to synthesize probe trace event.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Showing definition always go stdout */
|
|
printf("%s\n", buf);
|
|
free(buf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
|
|
{
|
|
struct strlist *namelist = strlist__new(NULL, NULL);
|
|
struct probe_trace_event *tev;
|
|
struct perf_probe_event *pev;
|
|
int i, j, ret = 0;
|
|
|
|
if (!namelist)
|
|
return -ENOMEM;
|
|
|
|
for (j = 0; j < npevs && !ret; j++) {
|
|
pev = &pevs[j];
|
|
for (i = 0; i < pev->ntevs && !ret; i++) {
|
|
tev = &pev->tevs[i];
|
|
/* Skip if the symbol is out of .text or blacklisted */
|
|
if (!tev->point.symbol && !pev->uprobes)
|
|
continue;
|
|
|
|
/* Set new name for tev (and update namelist) */
|
|
ret = probe_trace_event__set_name(tev, pev,
|
|
namelist, true);
|
|
if (!ret)
|
|
ret = show_probe_trace_event(tev);
|
|
}
|
|
}
|
|
strlist__delete(namelist);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int show_bootconfig_event(struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_point *tp = &tev->point;
|
|
struct strbuf buf;
|
|
char *ret = NULL;
|
|
int err;
|
|
|
|
if (strbuf_init(&buf, 32) < 0)
|
|
return -ENOMEM;
|
|
|
|
err = synthesize_kprobe_trace_def(tp, &buf);
|
|
if (err >= 0)
|
|
err = synthesize_probe_trace_args(tev, &buf);
|
|
if (err >= 0)
|
|
ret = strbuf_detach(&buf, NULL);
|
|
strbuf_release(&buf);
|
|
|
|
if (ret) {
|
|
printf("'%s'", ret);
|
|
free(ret);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int show_bootconfig_events(struct perf_probe_event *pevs, int npevs)
|
|
{
|
|
struct strlist *namelist = strlist__new(NULL, NULL);
|
|
struct probe_trace_event *tev;
|
|
struct perf_probe_event *pev;
|
|
char *cur_name = NULL;
|
|
int i, j, ret = 0;
|
|
|
|
if (!namelist)
|
|
return -ENOMEM;
|
|
|
|
for (j = 0; j < npevs && !ret; j++) {
|
|
pev = &pevs[j];
|
|
if (pev->group && strcmp(pev->group, "probe"))
|
|
pr_warning("WARN: Group name %s is ignored\n", pev->group);
|
|
if (pev->uprobes) {
|
|
pr_warning("ERROR: Bootconfig doesn't support uprobes\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
for (i = 0; i < pev->ntevs && !ret; i++) {
|
|
tev = &pev->tevs[i];
|
|
/* Skip if the symbol is out of .text or blacklisted */
|
|
if (!tev->point.symbol && !pev->uprobes)
|
|
continue;
|
|
|
|
/* Set new name for tev (and update namelist) */
|
|
ret = probe_trace_event__set_name(tev, pev,
|
|
namelist, true);
|
|
if (ret)
|
|
break;
|
|
|
|
if (!cur_name || strcmp(cur_name, tev->event)) {
|
|
printf("%sftrace.event.kprobes.%s.probe = ",
|
|
cur_name ? "\n" : "", tev->event);
|
|
cur_name = tev->event;
|
|
} else
|
|
printf(", ");
|
|
ret = show_bootconfig_event(tev);
|
|
}
|
|
}
|
|
printf("\n");
|
|
strlist__delete(namelist);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
/* Loop 2: add all events */
|
|
for (i = 0; i < npevs; i++) {
|
|
ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
|
|
pevs[i].ntevs,
|
|
probe_conf.force_add);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
|
|
{
|
|
int i, j;
|
|
struct perf_probe_event *pev;
|
|
|
|
/* Loop 3: cleanup and free trace events */
|
|
for (i = 0; i < npevs; i++) {
|
|
pev = &pevs[i];
|
|
for (j = 0; j < pevs[i].ntevs; j++)
|
|
clear_probe_trace_event(&pevs[i].tevs[j]);
|
|
zfree(&pevs[i].tevs);
|
|
pevs[i].ntevs = 0;
|
|
nsinfo__zput(pev->nsi);
|
|
clear_perf_probe_event(&pevs[i]);
|
|
}
|
|
}
|
|
|
|
int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_probe_symbol_maps(pevs->uprobes);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = convert_perf_probe_events(pevs, npevs);
|
|
if (ret == 0)
|
|
ret = apply_perf_probe_events(pevs, npevs);
|
|
|
|
cleanup_perf_probe_events(pevs, npevs);
|
|
|
|
exit_probe_symbol_maps();
|
|
return ret;
|
|
}
|
|
|
|
int del_perf_probe_events(struct strfilter *filter)
|
|
{
|
|
int ret, ret2, ufd = -1, kfd = -1;
|
|
char *str = strfilter__string(filter);
|
|
|
|
if (!str)
|
|
return -EINVAL;
|
|
|
|
/* Get current event names */
|
|
ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = probe_file__del_events(kfd, filter);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
goto error;
|
|
|
|
ret2 = probe_file__del_events(ufd, filter);
|
|
if (ret2 < 0 && ret2 != -ENOENT) {
|
|
ret = ret2;
|
|
goto error;
|
|
}
|
|
ret = 0;
|
|
|
|
error:
|
|
if (kfd >= 0)
|
|
close(kfd);
|
|
if (ufd >= 0)
|
|
close(ufd);
|
|
out:
|
|
free(str);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int show_available_funcs(const char *target, struct nsinfo *nsi,
|
|
struct strfilter *_filter, bool user)
|
|
{
|
|
struct map *map;
|
|
struct dso *dso;
|
|
int ret;
|
|
|
|
ret = init_probe_symbol_maps(user);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Get a symbol map */
|
|
map = get_target_map(target, nsi, user);
|
|
if (!map) {
|
|
pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = map__load(map);
|
|
if (ret) {
|
|
if (ret == -2) {
|
|
char *str = strfilter__string(_filter);
|
|
pr_err("Failed to find symbols matched to \"%s\"\n",
|
|
str);
|
|
free(str);
|
|
} else
|
|
pr_err("Failed to load symbols in %s\n",
|
|
(target) ? : "kernel");
|
|
goto end;
|
|
}
|
|
dso = map__dso(map);
|
|
dso__sort_by_name(dso);
|
|
|
|
/* Show all (filtered) symbols */
|
|
setup_pager();
|
|
|
|
for (size_t i = 0; i < dso->symbol_names_len; i++) {
|
|
struct symbol *pos = dso->symbol_names[i];
|
|
|
|
if (strfilter__compare(_filter, pos->name))
|
|
printf("%s\n", pos->name);
|
|
}
|
|
end:
|
|
map__put(map);
|
|
exit_probe_symbol_maps();
|
|
|
|
return ret;
|
|
}
|
|
|
|
int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
|
|
struct perf_probe_arg *pvar)
|
|
{
|
|
tvar->value = strdup(pvar->var);
|
|
if (tvar->value == NULL)
|
|
return -ENOMEM;
|
|
if (pvar->type) {
|
|
tvar->type = strdup(pvar->type);
|
|
if (tvar->type == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
if (pvar->name) {
|
|
tvar->name = strdup(pvar->name);
|
|
if (tvar->name == NULL)
|
|
return -ENOMEM;
|
|
} else
|
|
tvar->name = NULL;
|
|
return 0;
|
|
}
|