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-rw-r--r--tools/perf/util/probe-event.c3676
1 files changed, 3676 insertions, 0 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
new file mode 100644
index 000000000..97e2a72bd
--- /dev/null
+++ b/tools/perf/util/probe-event.c
@@ -0,0 +1,3676 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * probe-event.c : perf-probe definition to probe_events format converter
+ *
+ * Written by Masami Hiramatsu <mhiramat@redhat.com>
+ */
+
+#include <inttypes.h>
+#include <sys/utsname.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <limits.h>
+#include <elf.h>
+
+#include "build-id.h"
+#include "event.h"
+#include "namespaces.h"
+#include "strlist.h"
+#include "strfilter.h"
+#include "debug.h"
+#include "dso.h"
+#include "color.h"
+#include "map.h"
+#include "maps.h"
+#include "symbol.h"
+#include <api/fs/fs.h>
+#include "trace-event.h" /* For __maybe_unused */
+#include "probe-event.h"
+#include "probe-finder.h"
+#include "probe-file.h"
+#include "session.h"
+#include "string2.h"
+#include "strbuf.h"
+
+#include <subcmd/pager.h>
+#include <linux/ctype.h>
+#include <linux/zalloc.h>
+
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+#include <elfutils/debuginfod.h>
+#endif
+
+#define PERFPROBE_GROUP "probe"
+
+bool probe_event_dry_run; /* Dry run flag */
+struct probe_conf probe_conf = { .magic_num = DEFAULT_PROBE_MAGIC_NUM };
+
+#define semantic_error(msg ...) pr_err("Semantic error :" msg)
+
+int e_snprintf(char *str, size_t size, const char *format, ...)
+{
+ int ret;
+ va_list ap;
+ va_start(ap, format);
+ ret = vsnprintf(str, size, format, ap);
+ va_end(ap);
+ if (ret >= (int)size)
+ ret = -E2BIG;
+ return ret;
+}
+
+static struct machine *host_machine;
+
+/* Initialize symbol maps and path of vmlinux/modules */
+int init_probe_symbol_maps(bool user_only)
+{
+ int ret;
+
+ symbol_conf.sort_by_name = true;
+ symbol_conf.allow_aliases = true;
+ ret = symbol__init(NULL);
+ if (ret < 0) {
+ pr_debug("Failed to init symbol map.\n");
+ goto out;
+ }
+
+ if (host_machine || user_only) /* already initialized */
+ return 0;
+
+ if (symbol_conf.vmlinux_name)
+ pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
+
+ host_machine = machine__new_host();
+ if (!host_machine) {
+ pr_debug("machine__new_host() failed.\n");
+ symbol__exit();
+ ret = -1;
+ }
+out:
+ if (ret < 0)
+ pr_warning("Failed to init vmlinux path.\n");
+ return ret;
+}
+
+void exit_probe_symbol_maps(void)
+{
+ machine__delete(host_machine);
+ host_machine = NULL;
+ symbol__exit();
+}
+
+static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap)
+{
+ /* kmap->ref_reloc_sym should be set if host_machine is initialized */
+ struct kmap *kmap;
+ struct map *map = machine__kernel_map(host_machine);
+
+ if (map__load(map) < 0)
+ return NULL;
+
+ kmap = map__kmap(map);
+ if (!kmap)
+ return NULL;
+
+ if (pmap)
+ *pmap = map;
+
+ return kmap->ref_reloc_sym;
+}
+
+static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
+ bool reloc, bool reladdr)
+{
+ struct ref_reloc_sym *reloc_sym;
+ struct symbol *sym;
+ struct map *map;
+
+ /* ref_reloc_sym is just a label. Need a special fix*/
+ reloc_sym = kernel_get_ref_reloc_sym(&map);
+ if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
+ *addr = (!map->reloc || reloc) ? reloc_sym->addr :
+ reloc_sym->unrelocated_addr;
+ else {
+ sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
+ if (!sym)
+ return -ENOENT;
+ *addr = map->unmap_ip(map, sym->start) -
+ ((reloc) ? 0 : map->reloc) -
+ ((reladdr) ? map->start : 0);
+ }
+ return 0;
+}
+
+static struct map *kernel_get_module_map(const char *module)
+{
+ struct maps *maps = machine__kernel_maps(host_machine);
+ struct map *pos;
+
+ /* A file path -- this is an offline module */
+ if (module && strchr(module, '/'))
+ return dso__new_map(module);
+
+ if (!module) {
+ pos = machine__kernel_map(host_machine);
+ return map__get(pos);
+ }
+
+ maps__for_each_entry(maps, pos) {
+ /* short_name is "[module]" */
+ if (strncmp(pos->dso->short_name + 1, module,
+ pos->dso->short_name_len - 2) == 0 &&
+ module[pos->dso->short_name_len - 2] == '\0') {
+ return map__get(pos);
+ }
+ }
+ return NULL;
+}
+
+struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
+{
+ /* Init maps of given executable or kernel */
+ if (user) {
+ struct map *map;
+
+ map = dso__new_map(target);
+ if (map && map->dso) {
+ nsinfo__put(map->dso->nsinfo);
+ map->dso->nsinfo = nsinfo__get(nsi);
+ }
+ return map;
+ } else {
+ return kernel_get_module_map(target);
+ }
+}
+
+static int convert_exec_to_group(const char *exec, char **result)
+{
+ char *ptr1, *ptr2, *exec_copy;
+ char buf[64];
+ int ret;
+
+ exec_copy = strdup(exec);
+ if (!exec_copy)
+ return -ENOMEM;
+
+ ptr1 = basename(exec_copy);
+ if (!ptr1) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
+ if (!isalnum(*ptr2) && *ptr2 != '_') {
+ *ptr2 = '\0';
+ break;
+ }
+ }
+
+ ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
+ if (ret < 0)
+ goto out;
+
+ *result = strdup(buf);
+ ret = *result ? 0 : -ENOMEM;
+
+out:
+ free(exec_copy);
+ return ret;
+}
+
+static void clear_perf_probe_point(struct perf_probe_point *pp)
+{
+ zfree(&pp->file);
+ zfree(&pp->function);
+ zfree(&pp->lazy_line);
+}
+
+static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
+{
+ int i;
+
+ for (i = 0; i < ntevs; i++)
+ clear_probe_trace_event(tevs + i);
+}
+
+static bool kprobe_blacklist__listed(unsigned long address);
+static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
+{
+ struct map *map;
+ bool ret = false;
+
+ map = kernel_get_module_map(NULL);
+ if (map) {
+ ret = address <= map->start || map->end < address;
+ if (ret)
+ pr_warning("%s is out of .text, skip it.\n", symbol);
+ map__put(map);
+ }
+ if (!ret && kprobe_blacklist__listed(address)) {
+ pr_warning("%s is blacklisted function, skip it.\n", symbol);
+ ret = true;
+ }
+
+ return ret;
+}
+
+/*
+ * @module can be module name of module file path. In case of path,
+ * inspect elf and find out what is actual module name.
+ * Caller has to free mod_name after using it.
+ */
+static char *find_module_name(const char *module)
+{
+ int fd;
+ Elf *elf;
+ GElf_Ehdr ehdr;
+ GElf_Shdr shdr;
+ Elf_Data *data;
+ Elf_Scn *sec;
+ char *mod_name = NULL;
+ int name_offset;
+
+ fd = open(module, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL)
+ goto elf_err;
+
+ if (gelf_getehdr(elf, &ehdr) == NULL)
+ goto ret_err;
+
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".gnu.linkonce.this_module", NULL);
+ if (!sec)
+ goto ret_err;
+
+ data = elf_getdata(sec, NULL);
+ if (!data || !data->d_buf)
+ goto ret_err;
+
+ /*
+ * NOTE:
+ * '.gnu.linkonce.this_module' section of kernel module elf directly
+ * maps to 'struct module' from linux/module.h. This section contains
+ * actual module name which will be used by kernel after loading it.
+ * But, we cannot use 'struct module' here since linux/module.h is not
+ * exposed to user-space. Offset of 'name' has remained same from long
+ * time, so hardcoding it here.
+ */
+ if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
+ name_offset = 12;
+ else /* expect ELFCLASS64 by default */
+ name_offset = 24;
+
+ mod_name = strdup((char *)data->d_buf + name_offset);
+
+ret_err:
+ elf_end(elf);
+elf_err:
+ close(fd);
+ return mod_name;
+}
+
+#ifdef HAVE_DWARF_SUPPORT
+
+static int kernel_get_module_dso(const char *module, struct dso **pdso)
+{
+ struct dso *dso;
+ struct map *map;
+ const char *vmlinux_name;
+ int ret = 0;
+
+ if (module) {
+ char module_name[128];
+
+ snprintf(module_name, sizeof(module_name), "[%s]", module);
+ map = maps__find_by_name(&host_machine->kmaps, module_name);
+ if (map) {
+ dso = map->dso;
+ goto found;
+ }
+ pr_debug("Failed to find module %s.\n", module);
+ return -ENOENT;
+ }
+
+ map = machine__kernel_map(host_machine);
+ dso = map->dso;
+ if (!dso->has_build_id)
+ dso__read_running_kernel_build_id(dso, host_machine);
+
+ vmlinux_name = symbol_conf.vmlinux_name;
+ dso->load_errno = 0;
+ if (vmlinux_name)
+ ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
+ else
+ ret = dso__load_vmlinux_path(dso, map);
+found:
+ *pdso = dso;
+ return ret;
+}
+
+/*
+ * Some binaries like glibc have special symbols which are on the symbol
+ * table, but not in the debuginfo. If we can find the address of the
+ * symbol from map, we can translate the address back to the probe point.
+ */
+static int find_alternative_probe_point(struct debuginfo *dinfo,
+ struct perf_probe_point *pp,
+ struct perf_probe_point *result,
+ const char *target, struct nsinfo *nsi,
+ bool uprobes)
+{
+ struct map *map = NULL;
+ struct symbol *sym;
+ u64 address = 0;
+ int ret = -ENOENT;
+
+ /* 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, (unsigned long)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, unsigned long *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;
+ unsigned long 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,
+ (unsigned long)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, unsigned long offs)
+{
+ struct symbol *sym;
+ u64 addr = tp->address - offs;
+
+ sym = map__find_symbol(map, addr);
+ if (!sym)
+ return -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;
+ unsigned long 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;
+ unsigned long 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, (unsigned long)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!\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;
+
+ 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 > 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 = strtoul(pp->function, &tmp, 0);
+ if (*tmp != '\0') {
+ semantic_error("Invalid absolute address.\n");
+ return -EINVAL;
+ }
+ }
+ }
+
+ /* Parse other options */
+ while (ptr) {
+ arg = ptr;
+ c = nc;
+ if (c == ';') { /* Lazy pattern must be the last part */
+ pp->lazy_line = strdup(arg); /* let leave escapes */
+ if (pp->lazy_line == NULL)
+ return -ENOMEM;
+ break;
+ }
+ ptr = strpbrk_esc(arg, ";:+@%");
+ if (ptr) {
+ nc = *ptr;
+ *ptr++ = '\0';
+ }
+ switch (c) {
+ case ':': /* Line number */
+ pp->line = strtoul(arg, &tmp, 0);
+ if (*tmp != '\0') {
+ semantic_error("There is non-digit char"
+ " in line number.\n");
+ return -EINVAL;
+ }
+ break;
+ case '+': /* Byte offset from a symbol */
+ pp->offset = strtoul(arg, &tmp, 0);
+ if (*tmp != '\0') {
+ semantic_error("There is non-digit character"
+ " in offset.\n");
+ return -EINVAL;
+ }
+ break;
+ case '@': /* File name */
+ if (pp->file) {
+ semantic_error("SRC@SRC is not allowed.\n");
+ return -EINVAL;
+ }
+ pp->file = strdup_esc(arg);
+ if (pp->file == NULL)
+ return -ENOMEM;
+ break;
+ case '%': /* Probe places */
+ if (strcmp(arg, "return") == 0) {
+ pp->retprobe = 1;
+ } else { /* Others not supported yet */
+ semantic_error("%%%s is not supported.\n", arg);
+ return -ENOTSUP;
+ }
+ break;
+ default: /* Buggy case */
+ pr_err("This program has a bug at %s:%d.\n",
+ __FILE__, __LINE__);
+ return -ENOTSUP;
+ break;
+ }
+ }
+
+ /* Exclusion check */
+ if (pp->lazy_line && pp->line) {
+ semantic_error("Lazy pattern can't be used with"
+ " line number.\n");
+ return -EINVAL;
+ }
+
+ if (pp->lazy_line && pp->offset) {
+ semantic_error("Lazy pattern can't be used with offset.\n");
+ return -EINVAL;
+ }
+
+ if (pp->line && pp->offset) {
+ semantic_error("Offset can't be used with line number.\n");
+ return -EINVAL;
+ }
+
+ if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
+ semantic_error("File always requires line number or "
+ "lazy pattern.\n");
+ return -EINVAL;
+ }
+
+ if (pp->offset && !pp->function) {
+ semantic_error("Offset requires an entry function.\n");
+ return -EINVAL;
+ }
+
+ if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
+ semantic_error("Offset/Line/Lazy pattern can't be used with "
+ "return probe.\n");
+ return -EINVAL;
+ }
+
+ pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
+ pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
+ pp->lazy_line);
+ return 0;
+}
+
+/* Parse perf-probe event argument */
+static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
+{
+ char *tmp, *goodname;
+ struct perf_probe_arg_field **fieldp;
+
+ pr_debug("parsing arg: %s into ", str);
+
+ tmp = strchr(str, '=');
+ if (tmp) {
+ arg->name = strndup(str, tmp - str);
+ if (arg->name == NULL)
+ return -ENOMEM;
+ pr_debug("name:%s ", arg->name);
+ str = tmp + 1;
+ }
+
+ tmp = strchr(str, '@');
+ if (tmp && tmp != str && !strcmp(tmp + 1, "user")) { /* user attr */
+ if (!user_access_is_supported()) {
+ semantic_error("ftrace does not support user access\n");
+ return -EINVAL;
+ }
+ *tmp = '\0';
+ arg->user_access = true;
+ pr_debug("user_access ");
+ }
+
+ tmp = strchr(str, ':');
+ if (tmp) { /* Type setting */
+ *tmp = '\0';
+ arg->type = strdup(tmp + 1);
+ if (arg->type == NULL)
+ return -ENOMEM;
+ pr_debug("type:%s ", arg->type);
+ }
+
+ tmp = strpbrk(str, "-.[");
+ if (!is_c_varname(str) || !tmp) {
+ /* A variable, register, symbol or special value */
+ arg->var = strdup(str);
+ if (arg->var == NULL)
+ return -ENOMEM;
+ pr_debug("%s\n", arg->var);
+ return 0;
+ }
+
+ /* Structure fields or array element */
+ arg->var = strndup(str, tmp - str);
+ if (arg->var == NULL)
+ return -ENOMEM;
+ goodname = arg->var;
+ pr_debug("%s, ", arg->var);
+ fieldp = &arg->field;
+
+ do {
+ *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
+ if (*fieldp == NULL)
+ return -ENOMEM;
+ if (*tmp == '[') { /* Array */
+ str = tmp;
+ (*fieldp)->index = strtol(str + 1, &tmp, 0);
+ (*fieldp)->ref = true;
+ if (*tmp != ']' || tmp == str + 1) {
+ semantic_error("Array index must be a"
+ " number.\n");
+ return -EINVAL;
+ }
+ tmp++;
+ if (*tmp == '\0')
+ tmp = NULL;
+ } else { /* Structure */
+ if (*tmp == '.') {
+ str = tmp + 1;
+ (*fieldp)->ref = false;
+ } else if (tmp[1] == '>') {
+ str = tmp + 2;
+ (*fieldp)->ref = true;
+ } else {
+ semantic_error("Argument parse error: %s\n",
+ str);
+ return -EINVAL;
+ }
+ tmp = strpbrk(str, "-.[");
+ }
+ if (tmp) {
+ (*fieldp)->name = strndup(str, tmp - str);
+ if ((*fieldp)->name == NULL)
+ return -ENOMEM;
+ if (*str != '[')
+ goodname = (*fieldp)->name;
+ pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
+ fieldp = &(*fieldp)->next;
+ }
+ } while (tmp);
+ (*fieldp)->name = strdup(str);
+ if ((*fieldp)->name == NULL)
+ return -ENOMEM;
+ if (*str != '[')
+ goodname = (*fieldp)->name;
+ pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
+
+ /* If no name is specified, set the last field name (not array index)*/
+ if (!arg->name) {
+ arg->name = strdup(goodname);
+ if (arg->name == NULL)
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+/* Parse perf-probe event command */
+int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
+{
+ char **argv;
+ int argc, i, ret = 0;
+
+ argv = argv_split(cmd, &argc);
+ if (!argv) {
+ pr_debug("Failed to split arguments.\n");
+ return -ENOMEM;
+ }
+ if (argc - 1 > MAX_PROBE_ARGS) {
+ semantic_error("Too many probe arguments (%d).\n", argc - 1);
+ ret = -ERANGE;
+ goto out;
+ }
+ /* Parse probe point */
+ ret = parse_perf_probe_point(argv[0], pev);
+ if (ret < 0)
+ goto out;
+
+ /* Generate event name if needed */
+ if (!pev->event && pev->point.function && pev->point.line
+ && !pev->point.lazy_line && !pev->point.offset) {
+ if (asprintf(&pev->event, "%s_L%d", pev->point.function,
+ pev->point.line) < 0) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ /* Copy arguments and ensure return probe has no C argument */
+ pev->nargs = argc - 1;
+ pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
+ if (pev->args == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ for (i = 0; i < pev->nargs && ret >= 0; i++) {
+ ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
+ if (ret >= 0 &&
+ is_c_varname(pev->args[i].var) && pev->point.retprobe) {
+ semantic_error("You can't specify local variable for"
+ " kretprobe.\n");
+ ret = -EINVAL;
+ }
+ }
+out:
+ argv_free(argv);
+
+ return ret;
+}
+
+/* Returns true if *any* ARG is either C variable, $params or $vars. */
+bool perf_probe_with_var(struct perf_probe_event *pev)
+{
+ int i = 0;
+
+ for (i = 0; i < pev->nargs; i++)
+ if (is_c_varname(pev->args[i].var) ||
+ !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
+ !strcmp(pev->args[i].var, PROBE_ARG_VARS))
+ return true;
+ return false;
+}
+
+/* Return true if this perf_probe_event requires debuginfo */
+bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
+{
+ if (pev->point.file || pev->point.line || pev->point.lazy_line)
+ return true;
+
+ if (perf_probe_with_var(pev))
+ return true;
+
+ return false;
+}
+
+/* Parse probe_events event into struct probe_point */
+int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
+{
+ struct probe_trace_point *tp = &tev->point;
+ char pr;
+ char *p;
+ char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
+ int ret, i, argc;
+ char **argv;
+
+ pr_debug("Parsing probe_events: %s\n", cmd);
+ argv = argv_split(cmd, &argc);
+ if (!argv) {
+ pr_debug("Failed to split arguments.\n");
+ return -ENOMEM;
+ }
+ if (argc < 2) {
+ semantic_error("Too few probe arguments.\n");
+ ret = -ERANGE;
+ goto out;
+ }
+
+ /* Scan event and group name. */
+ argv0_str = strdup(argv[0]);
+ if (argv0_str == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ fmt1_str = strtok_r(argv0_str, ":", &fmt);
+ fmt2_str = strtok_r(NULL, "/", &fmt);
+ fmt3_str = strtok_r(NULL, " \t", &fmt);
+ if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
+ semantic_error("Failed to parse event name: %s\n", argv[0]);
+ ret = -EINVAL;
+ goto out;
+ }
+ pr = fmt1_str[0];
+ tev->group = strdup(fmt2_str);
+ tev->event = strdup(fmt3_str);
+ if (tev->group == NULL || tev->event == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
+
+ tp->retprobe = (pr == 'r');
+
+ /* Scan module name(if there), function name and offset */
+ p = strchr(argv[1], ':');
+ if (p) {
+ tp->module = strndup(argv[1], p - argv[1]);
+ if (!tp->module) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ tev->uprobes = (tp->module[0] == '/');
+ p++;
+ } else
+ p = argv[1];
+ fmt1_str = strtok_r(p, "+", &fmt);
+ /* only the address started with 0x */
+ if (fmt1_str[0] == '0') {
+ /*
+ * Fix a special case:
+ * if address == 0, kernel reports something like:
+ * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
+ * Newer kernel may fix that, but we want to
+ * support old kernel also.
+ */
+ if (strcmp(fmt1_str, "0x") == 0) {
+ if (!argv[2] || strcmp(argv[2], "(null)")) {
+ ret = -EINVAL;
+ goto out;
+ }
+ tp->address = 0;
+
+ free(argv[2]);
+ for (i = 2; argv[i + 1] != NULL; i++)
+ argv[i] = argv[i + 1];
+
+ argv[i] = NULL;
+ argc -= 1;
+ } else
+ tp->address = strtoul(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_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf)
+{
+ struct probe_trace_point *tp = &tev->point;
+ int err;
+
+ err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address);
+
+ if (err >= 0 && tp->ref_ctr_offset) {
+ if (!uprobe_ref_ctr_is_supported())
+ return -1;
+ err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
+ }
+ return err >= 0 ? 0 : -1;
+}
+
+char *synthesize_probe_trace_command(struct probe_trace_event *tev)
+{
+ struct probe_trace_point *tp = &tev->point;
+ struct strbuf buf;
+ char *ret = NULL;
+ int i, err;
+
+ /* Uprobes must have tp->module */
+ if (tev->uprobes && !tp->module)
+ return NULL;
+
+ 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 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 (tev->uprobes && !tp->address) {
+ if (!tp->symbol || strcmp(tp->symbol, "0x0"))
+ goto error;
+ }
+
+ /* Use the tp->address for uprobes */
+ if (tev->uprobes) {
+ err = synthesize_uprobe_trace_def(tev, &buf);
+ } else if (!strncmp(tp->symbol, "0x", 2)) {
+ /* Absolute address. See try_to_find_absolute_address() */
+ err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
+ tp->module ? ":" : "", tp->address);
+ } else {
+ err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
+ tp->module ? ":" : "", tp->symbol, tp->offset);
+ }
+
+ if (err)
+ goto error;
+
+ for (i = 0; i < tev->nargs; i++)
+ if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
+ goto error;
+
+ 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, (u64)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;
+ unsigned long start;
+ unsigned long 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%lx-0x%lx", &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%lx-0x%lx, %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,
+ unsigned long 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(unsigned long 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 0;
+
+ /* 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) { }
+
+/*
+ * 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) {
+ 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!\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ /* Setup result trace-probe-events */
+ *tevs = zalloc(sizeof(*tev) * num_matched_functions);
+ if (!*tevs) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = 0;
+
+ for (j = 0; j < num_matched_functions; j++) {
+ sym = syms[j];
+
+ if (sym->type != STT_FUNC)
+ continue;
+
+ /* There can be duplicated symbols in the map */
+ for (i = 0; i < j; i++)
+ if (sym->start == syms[i]->start) {
+ pr_debug("Found duplicated symbol %s @ %" PRIx64 "\n",
+ sym->name, sym->start);
+ break;
+ }
+ if (i != j)
+ continue;
+
+ tev = (*tevs) + ret;
+ tp = &tev->point;
+ if (ret == num_matched_functions) {
+ pr_warning("Too many symbols are listed. Skip it.\n");
+ break;
+ }
+ ret++;
+
+ if (pp->offset > sym->end - sym->start) {
+ pr_warning("Offset %ld is bigger than the size of %s\n",
+ pp->offset, sym->name);
+ ret = -ENOENT;
+ goto err_out;
+ }
+ /* Add one probe point */
+ tp->address = map->unmap_ip(map, sym->start) + pp->offset;
+
+ /* Check the kprobe (not in module) is within .text */
+ if (!pev->uprobes && !pev->target &&
+ kprobe_warn_out_range(sym->name, tp->address)) {
+ tp->symbol = NULL; /* Skip it */
+ skipped++;
+ } else if (reloc_sym) {
+ tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
+ tp->offset = tp->address - reloc_sym->addr;
+ } else {
+ tp->symbol = strdup_or_goto(sym->name, nomem_out);
+ tp->offset = pp->offset;
+ }
+ tp->realname = strdup_or_goto(sym->name, nomem_out);
+
+ tp->retprobe = pp->retprobe;
+ if (pev->target) {
+ if (pev->uprobes) {
+ tev->point.module = strdup_or_goto(pev->target,
+ nomem_out);
+ } else {
+ mod_name = find_module_name(pev->target);
+ tev->point.module =
+ strdup(mod_name ? mod_name : pev->target);
+ free(mod_name);
+ if (!tev->point.module)
+ goto nomem_out;
+ }
+ }
+ tev->uprobes = pev->uprobes;
+ tev->nargs = pev->nargs;
+ if (tev->nargs) {
+ tev->args = zalloc(sizeof(struct probe_trace_arg) *
+ tev->nargs);
+ if (tev->args == NULL)
+ goto nomem_out;
+ }
+ for (i = 0; i < tev->nargs; i++) {
+ if (pev->args[i].name)
+ tev->args[i].name =
+ strdup_or_goto(pev->args[i].name,
+ nomem_out);
+
+ tev->args[i].value = strdup_or_goto(pev->args[i].var,
+ nomem_out);
+ if (pev->args[i].type)
+ tev->args[i].type =
+ strdup_or_goto(pev->args[i].type,
+ nomem_out);
+ }
+ arch__fix_tev_from_maps(pev, tev, map, sym);
+ }
+ if (ret == skipped) {
+ ret = -ENOENT;
+ goto err_out;
+ }
+
+out:
+ map__put(map);
+ free(syms);
+ return ret;
+
+nomem_out:
+ ret = -ENOMEM;
+err_out:
+ clear_probe_trace_events(*tevs, num_matched_functions);
+ zfree(tevs);
+ goto out;
+}
+
+static int try_to_find_absolute_address(struct perf_probe_event *pev,
+ struct probe_trace_event **tevs)
+{
+ struct perf_probe_point *pp = &pev->point;
+ struct probe_trace_event *tev;
+ struct probe_trace_point *tp;
+ int i, err;
+
+ if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
+ return -EINVAL;
+ if (perf_probe_event_need_dwarf(pev))
+ return -EINVAL;
+
+ /*
+ * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
+ * absolute address.
+ *
+ * Only one tev can be generated by this.
+ */
+ *tevs = zalloc(sizeof(*tev));
+ if (!*tevs)
+ return -ENOMEM;
+
+ tev = *tevs;
+ tp = &tev->point;
+
+ /*
+ * Don't use tp->offset, use address directly, because
+ * in synthesize_probe_trace_command() address cannot be
+ * zero.
+ */
+ tp->address = pev->point.abs_address;
+ tp->retprobe = pp->retprobe;
+ tev->uprobes = pev->uprobes;
+
+ err = -ENOMEM;
+ /*
+ * Give it a '0x' leading symbol name.
+ * In __add_probe_trace_events, a NULL symbol is interpreted as
+ * invalid.
+ */
+ if (asprintf(&tp->symbol, "0x%lx", 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_%lx", 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;
+}
+
+/* Concatinate 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 {
+ /* Concatinate 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;
+}
+
+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;
+}