File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
new file mode 100644
index 0000000..03875f9
--- /dev/null
+++ b/tools/perf/util/probe-event.c
@@ -0,0 +1,2947 @@
+/*
+ * probe-event.c : perf-probe definition to probe_events format converter
+ *
+ * Written by Masami Hiramatsu <mhiramat@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#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 "util.h"
+#include "event.h"
+#include "strlist.h"
+#include "debug.h"
+#include "cache.h"
+#include "color.h"
+#include "symbol.h"
+#include "thread.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"
+
+#define MAX_CMDLEN 256
+#define PERFPROBE_GROUP "probe"
+
+bool probe_event_dry_run; /* Dry run flag */
+struct probe_conf probe_conf;
+
+#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 char *synthesize_perf_probe_point(struct perf_probe_point *pp);
+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)
+{
+ if (host_machine) {
+ machine__delete(host_machine);
+ host_machine = NULL;
+ }
+ symbol__exit();
+}
+
+static struct symbol *__find_kernel_function_by_name(const char *name,
+ struct map **mapp)
+{
+ return machine__find_kernel_function_by_name(host_machine, name, mapp,
+ NULL);
+}
+
+static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
+{
+ return machine__find_kernel_function(host_machine, addr, mapp, NULL);
+}
+
+static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
+{
+ /* 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, NULL) < 0)
+ return NULL;
+
+ kmap = map__kmap(map);
+ if (!kmap)
+ return NULL;
+ 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();
+ if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
+ *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
+ else {
+ sym = __find_kernel_function_by_name(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 map_groups *grp = &host_machine->kmaps;
+ struct maps *maps = &grp->maps[MAP__FUNCTION];
+ struct map *pos;
+
+ /* A file path -- this is an offline module */
+ if (module && strchr(module, '/'))
+ return machine__findnew_module_map(host_machine, 0, module);
+
+ if (!module)
+ module = "kernel";
+
+ for (pos = maps__first(maps); pos; pos = map__next(pos)) {
+ if (strncmp(pos->dso->short_name + 1, module,
+ pos->dso->short_name_len - 2) == 0) {
+ return pos;
+ }
+ }
+ return NULL;
+}
+
+static struct map *get_target_map(const char *target, bool user)
+{
+ /* Init maps of given executable or kernel */
+ if (user)
+ return dso__new_map(target);
+ else
+ return kernel_get_module_map(target);
+}
+
+static void put_target_map(struct map *map, bool user)
+{
+ if (map && user) {
+ /* Only the user map needs to be released */
+ map__put(map);
+ }
+}
+
+
+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;
+ }
+
+ ptr2 = strpbrk(ptr1, "-._");
+ if (ptr2)
+ *ptr2 = '\0';
+ 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)
+{
+ free(pp->file);
+ free(pp->function);
+ free(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)
+{
+ u64 etext_addr = 0;
+ int ret;
+
+ /* Get the address of _etext for checking non-probable text symbol */
+ ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
+ false, false);
+
+ if (ret == 0 && etext_addr < address)
+ pr_warning("%s is out of .text, skip it.\n", symbol);
+ else if (kprobe_blacklist__listed(address))
+ pr_warning("%s is blacklisted function, skip it.\n", symbol);
+ else
+ return false;
+
+ return true;
+}
+
+#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 = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, 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;
+
+ vmlinux_name = symbol_conf.vmlinux_name;
+ dso->load_errno = 0;
+ if (vmlinux_name)
+ ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
+ else
+ ret = dso__load_vmlinux_path(dso, map, NULL);
+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, 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, 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;
+ else
+ address = map->unmap_ip(map, sym->start);
+ 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:
+ put_target_map(map, uprobes);
+ 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->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, 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;
+}
+
+/* Open new debuginfo of given module */
+static struct debuginfo *open_debuginfo(const char *module, bool silent)
+{
+ const char *path = module;
+ char reason[STRERR_BUFSIZE];
+ struct debuginfo *ret = NULL;
+ struct dso *dso = NULL;
+ int err;
+
+ if (!module || !strchr(module, '/')) {
+ err = kernel_get_module_dso(module, &dso);
+ if (err < 0) {
+ if (!dso || dso->load_errno == 0) {
+ if (!strerror_r(-err, reason, STRERR_BUFSIZE))
+ strcpy(reason, "(unknown)");
+ } else
+ dso__strerror_load(dso, reason, STRERR_BUFSIZE);
+ if (!silent)
+ pr_err("Failed to find the path for %s: %s\n",
+ module ?: "kernel", reason);
+ return NULL;
+ }
+ path = dso->long_name;
+ }
+ 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");
+ }
+ 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, 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)
+{
+ Elf *elf;
+ GElf_Ehdr ehdr;
+ GElf_Shdr shdr;
+ int fd, ret = -ENOENT;
+
+ fd = open(exec, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL)
+ return -EINVAL;
+
+ 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);
+ 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);
+ 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;
+}
+
+static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
+ int ntevs, const char *exec)
+{
+ int i, ret = 0;
+ unsigned long stext = 0;
+
+ if (!exec)
+ return 0;
+
+ ret = get_text_start_address(exec, &stext);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ntevs && ret >= 0; i++) {
+ /* point.address is the addres 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 add_module_to_probe_trace_events(struct probe_trace_event *tevs,
+ int ntevs, const char *module)
+{
+ int i, ret = 0;
+ char *tmp;
+
+ if (!module)
+ return 0;
+
+ tmp = strrchr(module, '/');
+ if (tmp) {
+ /* This is a module path -- get the module name */
+ module = strdup(tmp + 1);
+ if (!module)
+ return -ENOMEM;
+ tmp = strchr(module, '.');
+ if (tmp)
+ *tmp = '\0';
+ tmp = (char *)module; /* For free() */
+ }
+
+ for (i = 0; i < ntevs; i++) {
+ tevs[i].point.module = strdup(module);
+ if (!tevs[i].point.module) {
+ ret = -ENOMEM;
+ break;
+ }
+ }
+
+ free(tmp);
+ return ret;
+}
+
+/* Post processing the probe events */
+static int post_process_probe_trace_events(struct probe_trace_event *tevs,
+ int ntevs, const char *module,
+ bool uprobe)
+{
+ struct ref_reloc_sym *reloc_sym;
+ char *tmp;
+ int i, skipped = 0;
+
+ if (uprobe)
+ return add_exec_to_probe_trace_events(tevs, ntevs, module);
+
+ /* Note that currently ref_reloc_sym based probe is not for drivers */
+ if (module)
+ return add_module_to_probe_trace_events(tevs, ntevs, module);
+
+ reloc_sym = kernel_get_ref_reloc_sym();
+ 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 || tevs[i].point.retprobe)
+ continue;
+ /* If we found a wrong one, mark it by NULL symbol */
+ if (kprobe_warn_out_range(tevs[i].point.symbol,
+ 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 -
+ reloc_sym->unrelocated_addr;
+ }
+ return skipped;
+}
+
+/* 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, !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));
+ }
+ }
+
+ debuginfo__delete(dinfo);
+
+ if (ntevs > 0) { /* Succeeded to find trace events */
+ pr_debug("Found %d probe_trace_events.\n", ntevs);
+ ret = post_process_probe_trace_events(*tevs, ntevs,
+ pev->target, pev->uprobes);
+ if (ret < 0 || ret == ntevs) {
+ clear_probe_trace_events(*tevs, ntevs);
+ zfree(tevs);
+ }
+ if (ret != ntevs)
+ return ret < 0 ? ret : ntevs;
+ ntevs = 0;
+ /* Fall through */
+ }
+
+ 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;
+ }
+ /* Error path : ntevs < 0 */
+ pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
+ if (ntevs < 0) {
+ 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",
+ strerror_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)
+{
+ int l = 1;
+ struct int_node *ln;
+ struct debuginfo *dinfo;
+ FILE *fp;
+ int ret;
+ char *tmp;
+ char sbuf[STRERR_BUFSIZE];
+
+ /* Search a line range */
+ dinfo = open_debuginfo(module, 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);
+ }
+ 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 = get_real_path(tmp, 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,
+ strerror_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(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, bool user)
+{
+ int ret;
+
+ ret = init_probe_symbol_maps(user);
+ if (ret < 0)
+ return ret;
+ ret = __show_line_range(lr, module, user);
+ 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(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, 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,
+ 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)
+{
+ free(lr->function);
+ free(lr->file);
+ free(lr->path);
+ free(lr->comp_dir);
+ intlist__delete(lr->line_list);
+ memset(lr, 0, sizeof(*lr));
+}
+
+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;
+}
+
+/* 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;
+ /*
+ * <Syntax>
+ * perf probe [EVENT=]SRC[:LN|;PTN]
+ * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
+ *
+ * TODO:Group name support
+ */
+ if (!arg)
+ return -EINVAL;
+
+ ptr = strpbrk(arg, ";=@+%");
+ if (ptr && *ptr == '=') { /* Event name */
+ *ptr = '\0';
+ tmp = ptr + 1;
+ if (strchr(arg, ':')) {
+ semantic_error("Group name is not supported yet.\n");
+ return -ENOTSUP;
+ }
+ if (!is_c_func_name(arg)) {
+ semantic_error("%s is bad for event name -it must "
+ "follow C symbol-naming rule.\n", arg);
+ return -EINVAL;
+ }
+ pev->event = strdup(arg);
+ if (pev->event == NULL)
+ return -ENOMEM;
+ pev->group = NULL;
+ 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(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
+ /* This is a file spec if it includes a '.' before ; or : */
+ if (memchr(arg, '.', ptr - arg))
+ file_spec = true;
+ }
+
+ ptr = strpbrk(arg, ";:+@%");
+ if (ptr) {
+ nc = *ptr;
+ *ptr++ = '\0';
+ }
+
+ if (arg[0] == '\0')
+ tmp = NULL;
+ else {
+ tmp = strdup(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);
+ if (pp->lazy_line == NULL)
+ return -ENOMEM;
+ break;
+ }
+ ptr = strpbrk(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(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->retprobe && !pp->function) {
+ semantic_error("Return probe 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) { /* 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;
+
+ /* 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;
+}
+
+/* Return true if this perf_probe_event requires debuginfo */
+bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
+{
+ int i;
+
+ if (pev->point.file || pev->point.line || pev->point.lazy_line)
+ return true;
+
+ for (i = 0; i < pev->nargs; i++)
+ if (is_c_varname(pev->args[i].var))
+ 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 || strlen(fmt1_str) != 1 || 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]);
+ 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);
+ }
+
+ 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 */
+int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
+{
+ struct perf_probe_arg_field *field = pa->field;
+ int ret;
+ char *tmp = buf;
+
+ if (pa->name && pa->var)
+ ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
+ else
+ ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
+ if (ret <= 0)
+ goto error;
+ tmp += ret;
+ len -= ret;
+
+ while (field) {
+ if (field->name[0] == '[')
+ ret = e_snprintf(tmp, len, "%s", field->name);
+ else
+ ret = e_snprintf(tmp, len, "%s%s",
+ field->ref ? "->" : ".", field->name);
+ if (ret <= 0)
+ goto error;
+ tmp += ret;
+ len -= ret;
+ field = field->next;
+ }
+
+ if (pa->type) {
+ ret = e_snprintf(tmp, len, ":%s", pa->type);
+ if (ret <= 0)
+ goto error;
+ tmp += ret;
+ len -= ret;
+ }
+
+ return tmp - buf;
+error:
+ pr_debug("Failed to synthesize perf probe argument: %d\n", ret);
+ return ret;
+}
+
+/* Compose only probe point (not argument) */
+static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
+{
+ char *buf, *tmp;
+ char offs[32] = "", line[32] = "", file[32] = "";
+ int ret, len;
+
+ buf = zalloc(MAX_CMDLEN);
+ if (buf == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ if (pp->offset) {
+ ret = e_snprintf(offs, 32, "+%lu", pp->offset);
+ if (ret <= 0)
+ goto error;
+ }
+ if (pp->line) {
+ ret = e_snprintf(line, 32, ":%d", pp->line);
+ if (ret <= 0)
+ goto error;
+ }
+ 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;
+ }
+ ret = e_snprintf(file, 32, "@%s", tmp);
+ if (ret <= 0)
+ goto error;
+ }
+
+ if (pp->function)
+ ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
+ offs, pp->retprobe ? "%return" : "", line,
+ file);
+ else
+ ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
+ if (ret <= 0)
+ goto error;
+
+ return buf;
+error:
+ pr_debug("Failed to synthesize perf probe point: %d\n", ret);
+ free(buf);
+ return NULL;
+}
+
+#if 0
+char *synthesize_perf_probe_command(struct perf_probe_event *pev)
+{
+ char *buf;
+ int i, len, ret;
+
+ buf = synthesize_perf_probe_point(&pev->point);
+ if (!buf)
+ return NULL;
+
+ len = strlen(buf);
+ for (i = 0; i < pev->nargs; i++) {
+ ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
+ pev->args[i].name);
+ if (ret <= 0) {
+ free(buf);
+ return NULL;
+ }
+ len += ret;
+ }
+
+ return buf;
+}
+#endif
+
+static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
+ char **buf, size_t *buflen,
+ int depth)
+{
+ int ret;
+ if (ref->next) {
+ depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
+ buflen, depth + 1);
+ if (depth < 0)
+ goto out;
+ }
+
+ ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
+ if (ret < 0)
+ depth = ret;
+ else {
+ *buf += ret;
+ *buflen -= ret;
+ }
+out:
+ return depth;
+
+}
+
+static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
+ char *buf, size_t buflen)
+{
+ struct probe_trace_arg_ref *ref = arg->ref;
+ int ret, depth = 0;
+ char *tmp = buf;
+
+ /* Argument name or separator */
+ if (arg->name)
+ ret = e_snprintf(buf, buflen, " %s=", arg->name);
+ else
+ ret = e_snprintf(buf, buflen, " ");
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ buflen -= ret;
+
+ /* Special case: @XXX */
+ if (arg->value[0] == '@' && arg->ref)
+ ref = ref->next;
+
+ /* Dereferencing arguments */
+ if (ref) {
+ depth = __synthesize_probe_trace_arg_ref(ref, &buf,
+ &buflen, 1);
+ if (depth < 0)
+ return depth;
+ }
+
+ /* Print argument value */
+ if (arg->value[0] == '@' && arg->ref)
+ ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
+ arg->ref->offset);
+ else
+ ret = e_snprintf(buf, buflen, "%s", arg->value);
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ buflen -= ret;
+
+ /* Closing */
+ while (depth--) {
+ ret = e_snprintf(buf, buflen, ")");
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ buflen -= ret;
+ }
+ /* Print argument type */
+ if (arg->type) {
+ ret = e_snprintf(buf, buflen, ":%s", arg->type);
+ if (ret <= 0)
+ return ret;
+ buf += ret;
+ }
+
+ return buf - tmp;
+}
+
+char *synthesize_probe_trace_command(struct probe_trace_event *tev)
+{
+ struct probe_trace_point *tp = &tev->point;
+ char *buf;
+ int i, len, ret;
+
+ buf = zalloc(MAX_CMDLEN);
+ if (buf == NULL)
+ return NULL;
+
+ len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
+ tev->group, tev->event);
+ if (len <= 0)
+ goto error;
+
+ /* Uprobes must have tp->module */
+ if (tev->uprobes && !tp->module)
+ 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)
+ ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s:0x%lx",
+ tp->module, tp->address);
+ else if (!strncmp(tp->symbol, "0x", 2))
+ /* Absolute address. See try_to_find_absolute_address() */
+ ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s0x%lx",
+ tp->module ?: "", tp->module ? ":" : "",
+ tp->address);
+ else
+ ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s%s+%lu",
+ tp->module ?: "", tp->module ? ":" : "",
+ tp->symbol, tp->offset);
+
+ if (ret <= 0)
+ goto error;
+ len += ret;
+
+ for (i = 0; i < tev->nargs; i++) {
+ ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
+ MAX_CMDLEN - len);
+ if (ret <= 0)
+ goto error;
+ len += ret;
+ }
+
+ return buf;
+error:
+ free(buf);
+ return NULL;
+}
+
+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;
+ 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, NULL);
+ } 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 = __find_kernel_function(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)
+{
+ char buf[64] = "";
+ 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 {
+ ret = synthesize_probe_trace_arg(&tev->args[i],
+ buf, 64);
+ pev->args[i].name = strdup(buf);
+ }
+ if (pev->args[i].name == NULL && ret >= 0)
+ ret = -ENOMEM;
+ }
+
+ 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;
+
+ free(pev->event);
+ free(pev->group);
+ free(pev->target);
+ clear_perf_probe_point(&pev->point);
+
+ for (i = 0; i < pev->nargs; i++) {
+ free(pev->args[i].name);
+ free(pev->args[i].var);
+ free(pev->args[i].type);
+ field = pev->args[i].field;
+ while (field) {
+ next = field->next;
+ zfree(&field->name);
+ free(field);
+ field = next;
+ }
+ }
+ free(pev->args);
+ memset(pev, 0, sizeof(*pev));
+}
+
+void clear_probe_trace_event(struct probe_trace_event *tev)
+{
+ struct probe_trace_arg_ref *ref, *next;
+ int i;
+
+ free(tev->event);
+ free(tev->group);
+ free(tev->point.symbol);
+ free(tev->point.realname);
+ free(tev->point.module);
+ for (i = 0; i < tev->nargs; i++) {
+ free(tev->args[i].name);
+ free(tev->args[i].value);
+ free(tev->args[i].type);
+ ref = tev->args[i].ref;
+ while (ref) {
+ next = ref->next;
+ free(ref);
+ ref = next;
+ }
+ }
+ free(tev->args);
+ memset(tev, 0, sizeof(*tev));
+}
+
+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(&node->list);
+ free(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[128];
+ char *place;
+
+ /* Synthesize only event probe point */
+ place = synthesize_perf_probe_point(&pev->point);
+ if (!place)
+ return -EINVAL;
+
+ ret = e_snprintf(buf, 128, "%s:%s", group, event);
+ if (ret < 0)
+ goto out;
+
+ strbuf_addf(result, " %-20s (on %s", buf, place);
+ if (module)
+ strbuf_addf(result, " in %s", module);
+
+ if (pev->nargs > 0) {
+ strbuf_addstr(result, " with");
+ for (i = 0; i < pev->nargs; i++) {
+ ret = synthesize_perf_probe_arg(&pev->args[i],
+ buf, 128);
+ if (ret < 0)
+ goto out;
+ strbuf_addf(result, " %s", buf);
+ }
+ }
+ strbuf_addch(result, ')');
+out:
+ free(place);
+ 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(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();
+
+ 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 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)*/
+ p = strchr(nbase, '.');
+ if (p && p != nbase)
+ *p = '\0';
+
+ /* Try no suffix number */
+ ret = e_snprintf(buf, len, "%s", nbase);
+ 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. "
+ "(Use -f to force duplicates.)\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);
+ 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);
+
+ /* 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 (pev->event)
+ event = pev->event;
+ else
+ 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)
+ group = pev->group;
+ else
+ group = PERFPROBE_GROUP;
+
+ /* Get an unused new event name */
+ ret = get_new_event_name(buf, 64, event,
+ namelist, 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 added event name to namelist */
+ strlist__add(namelist, event);
+ return 0;
+}
+
+static int __add_probe_trace_events(struct perf_probe_event *pev,
+ struct probe_trace_event *tevs,
+ int ntevs, bool allow_suffix)
+{
+ int i, fd, ret;
+ struct probe_trace_event *tev = NULL;
+ struct strlist *namelist;
+
+ fd = probe_file__open(PF_FL_RW | (pev->uprobes ? 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");
+ ret = -ENOMEM;
+ goto close_out;
+ }
+
+ ret = 0;
+ for (i = 0; i < ntevs; i++) {
+ tev = &tevs[i];
+ /* Skip if the symbol is out of .text or blacklisted */
+ if (!tev->point.symbol)
+ continue;
+
+ /* Set new name for tev (and update namelist) */
+ ret = probe_trace_event__set_name(tev, pev, namelist,
+ allow_suffix);
+ if (ret < 0)
+ break;
+
+ ret = probe_file__add_event(fd, tev);
+ 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);
+
+ strlist__delete(namelist);
+close_out:
+ close(fd);
+ 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;
+
+ if (map__load(map, NULL) < 0)
+ return 0;
+
+ map__for_each_symbol(map, sym, tmp) {
+ if (strglobmatch(sym->name, name)) {
+ found++;
+ if (syms && found < probe_conf.max_probes)
+ syms[found - 1] = sym;
+ }
+ }
+
+ return found;
+}
+
+#define strdup_or_goto(str, label) \
+ ({ char *__p = strdup(str); if (!__p) goto label; __p; })
+
+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) { }
+
+/*
+ * 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;
+
+ map = get_target_map(pev->target, 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 && !pp->retprobe && !pev->target) {
+ reloc_sym = kernel_get_ref_reloc_sym();
+ 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];
+
+ 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)
+ tev->point.module = strdup_or_goto(pev->target,
+ 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);
+ }
+ if (ret == skipped) {
+ ret = -ENOENT;
+ goto err_out;
+ }
+
+out:
+ put_target_map(map, pev->uprobes);
+ 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
+ * invalud.
+ */
+ 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) {
+ err = -ENOMEM;
+ goto errout;
+ }
+ for (i = 0; i < tev->nargs; i++)
+ copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
+
+ return 1;
+
+errout:
+ if (*tevs) {
+ clear_probe_trace_events(*tevs, 1);
+ *tevs = NULL;
+ }
+ return err;
+}
+
+bool __weak arch__prefers_symtab(void) { return false; }
+
+static int convert_to_probe_trace_events(struct perf_probe_event *pev,
+ struct probe_trace_event **tevs)
+{
+ int ret;
+
+ if (pev->uprobes && !pev->group) {
+ /* Replace group name if not given */
+ 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;
+
+ if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
+ ret = find_probe_trace_events_from_map(pev, tevs);
+ if (ret > 0)
+ return ret; /* Found in symbol table */
+ }
+
+ /* 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;
+}
+
+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;
+
+ /* Loop 3: cleanup and free trace events */
+ for (i = 0; i < npevs; 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;
+ 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;
+}
+
+/* TODO: don't use a global variable for filter ... */
+static struct strfilter *available_func_filter;
+
+/*
+ * If a symbol corresponds to a function with global binding and
+ * matches filter return 0. For all others return 1.
+ */
+static int filter_available_functions(struct map *map __maybe_unused,
+ struct symbol *sym)
+{
+ if (strfilter__compare(available_func_filter, sym->name))
+ return 0;
+ return 1;
+}
+
+int show_available_funcs(const char *target, struct strfilter *_filter,
+ bool user)
+{
+ struct map *map;
+ int ret;
+
+ ret = init_probe_symbol_maps(user);
+ if (ret < 0)
+ return ret;
+
+ /* Get a symbol map */
+ if (user)
+ map = dso__new_map(target);
+ else
+ map = kernel_get_module_map(target);
+ if (!map) {
+ pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
+ return -EINVAL;
+ }
+
+ /* Load symbols with given filter */
+ available_func_filter = _filter;
+ if (map__load(map, filter_available_functions)) {
+ pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
+ goto end;
+ }
+ if (!dso__sorted_by_name(map->dso, map->type))
+ dso__sort_by_name(map->dso, map->type);
+
+ /* Show all (filtered) symbols */
+ setup_pager();
+ dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
+end:
+ if (user) {
+ 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;
+}