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3791 lines
87 KiB
3791 lines
87 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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 <[email protected]> |
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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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|
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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 "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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|
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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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|
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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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|
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#define PERFPROBE_GROUP "probe" |
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|
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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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|
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#define semantic_error(msg ...) pr_err("Semantic error :" msg) |
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|
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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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|
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static struct machine *host_machine; |
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|
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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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|
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symbol_conf.sort_by_name = true; |
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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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|
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if (host_machine || user_only) /* already initialized */ |
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return 0; |
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|
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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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|
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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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|
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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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|
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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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|
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if (map__load(map) < 0) |
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return NULL; |
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|
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kmap = map__kmap(map); |
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if (!kmap) |
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return NULL; |
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|
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if (pmap) |
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*pmap = map; |
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|
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return kmap->ref_reloc_sym; |
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} |
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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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|
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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 || 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) - |
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((reladdr) ? map->start : 0); |
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} |
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return 0; |
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} |
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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 *pos; |
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|
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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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|
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if (!module) { |
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pos = machine__kernel_map(host_machine); |
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return map__get(pos); |
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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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if (strncmp(pos->dso->short_name + 1, module, |
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pos->dso->short_name_len - 2) == 0 && |
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module[pos->dso->short_name_len - 2] == '\0') { |
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return map__get(pos); |
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} |
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} |
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return NULL; |
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} |
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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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|
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map = dso__new_map(target); |
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if (map && map->dso) { |
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nsinfo__put(map->dso->nsinfo); |
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map->dso->nsinfo = nsinfo__get(nsi); |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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*result = strdup(buf); |
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ret = *result ? 0 : -ENOMEM; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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->end < 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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|
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return ret; |
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} |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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mod_name = strdup((char *)data->d_buf + name_offset); |
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|
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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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|
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#ifdef HAVE_DWARF_SUPPORT |
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|
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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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|
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if (module) { |
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char module_name[128]; |
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|
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snprintf(module_name, sizeof(module_name), "[%s]", module); |
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map = maps__find_by_name(&host_machine->kmaps, module_name); |
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if (map) { |
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dso = map->dso; |
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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; |
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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, |
|
struct perf_probe_point *result, |
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const char *target, struct nsinfo *nsi, |
|
bool uprobes) |
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{ |
|
struct map *map = NULL; |
|
struct symbol *sym; |
|
u64 address = 0; |
|
int ret = -ENOENT; |
|
|
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/* This can work only for function-name based one */ |
|
if (!pp->function || pp->file) |
|
return -ENOTSUP; |
|
|
|
map = get_target_map(target, nsi, uprobes); |
|
if (!map) |
|
return -EINVAL; |
|
|
|
/* Find the address of given function */ |
|
map__for_each_symbol_by_name(map, pp->function, sym) { |
|
if (uprobes) { |
|
address = sym->start; |
|
if (sym->type == STT_GNU_IFUNC) |
|
pr_warning("Warning: The probe function (%s) is a GNU indirect function.\n" |
|
"Consider identifying the final function used at run time and set the probe directly on that.\n", |
|
pp->function); |
|
} else |
|
address = map->unmap_ip(map, sym->start) - map->reloc; |
|
break; |
|
} |
|
if (!address) { |
|
ret = -ENOENT; |
|
goto out; |
|
} |
|
pr_debug("Symbol %s address found : %" PRIx64 "\n", |
|
pp->function, address); |
|
|
|
ret = debuginfo__find_probe_point(dinfo, address, result); |
|
if (ret <= 0) |
|
ret = (!ret) ? -ENOENT : ret; |
|
else { |
|
result->offset += pp->offset; |
|
result->line += pp->line; |
|
result->retprobe = pp->retprobe; |
|
ret = 0; |
|
} |
|
|
|
out: |
|
map__put(map); |
|
return ret; |
|
|
|
} |
|
|
|
static int get_alternative_probe_event(struct debuginfo *dinfo, |
|
struct perf_probe_event *pev, |
|
struct perf_probe_point *tmp) |
|
{ |
|
int ret; |
|
|
|
memcpy(tmp, &pev->point, sizeof(*tmp)); |
|
memset(&pev->point, 0, sizeof(pev->point)); |
|
ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, |
|
pev->nsi, pev->uprobes); |
|
if (ret < 0) |
|
memcpy(&pev->point, tmp, sizeof(*tmp)); |
|
|
|
return ret; |
|
} |
|
|
|
static int get_alternative_line_range(struct debuginfo *dinfo, |
|
struct line_range *lr, |
|
const char *target, bool user) |
|
{ |
|
struct perf_probe_point pp = { .function = lr->function, |
|
.file = lr->file, |
|
.line = lr->start }; |
|
struct perf_probe_point result; |
|
int ret, len = 0; |
|
|
|
memset(&result, 0, sizeof(result)); |
|
|
|
if (lr->end != INT_MAX) |
|
len = lr->end - lr->start; |
|
ret = find_alternative_probe_point(dinfo, &pp, &result, |
|
target, NULL, user); |
|
if (!ret) { |
|
lr->function = result.function; |
|
lr->file = result.file; |
|
lr->start = result.line; |
|
if (lr->end != INT_MAX) |
|
lr->end = lr->start + len; |
|
clear_perf_probe_point(&pp); |
|
} |
|
return ret; |
|
} |
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT |
|
static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *nsi, |
|
bool silent) |
|
{ |
|
debuginfod_client *c = debuginfod_begin(); |
|
char sbuild_id[SBUILD_ID_SIZE + 1]; |
|
struct debuginfo *ret = NULL; |
|
struct nscookie nsc; |
|
char *path; |
|
int fd; |
|
|
|
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); |
|
nsinfo__mountns_exit(&nsc); |
|
return ret; |
|
} |
|
#else |
|
static inline |
|
struct debuginfo *open_from_debuginfod(struct dso *dso __maybe_unused, |
|
struct nsinfo *nsi __maybe_unused, |
|
bool silent __maybe_unused) |
|
{ |
|
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 ? 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 -ENOENT; |
|
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 -ENOENT; |
|
} 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 |
|
* 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) |
|
return -ENOMEM; |
|
} |
|
|
|
/* 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]; |
|
|
|
/* 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 rb_node *nd; |
|
struct map *map; |
|
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; |
|
} |
|
if (!dso__sorted_by_name(map->dso)) |
|
dso__sort_by_name(map->dso); |
|
|
|
/* Show all (filtered) symbols */ |
|
setup_pager(); |
|
|
|
for (nd = rb_first_cached(&map->dso->symbol_names); nd; |
|
nd = rb_next(nd)) { |
|
struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); |
|
|
|
if (strfilter__compare(_filter, pos->sym.name)) |
|
printf("%s\n", pos->sym.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; |
|
}
|
|
|