probe-event.c 70.6 KB
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/*
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 * probe-event.c : perf-probe definition to probe_events format converter
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 *
 * 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>
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#include <stdarg.h>
#include <limits.h>
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#include <elf.h>
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#include "util.h"
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#include "event.h"
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#include "strlist.h"
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#include "debug.h"
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#include "cache.h"
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#include "color.h"
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#include "symbol.h"
#include "thread.h"
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#include <api/fs/fs.h>
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#include "trace-event.h"	/* For __maybe_unused */
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#include "probe-event.h"
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#include "probe-finder.h"
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#include "probe-file.h"
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#include "session.h"
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#define MAX_CMDLEN 256
#define PERFPROBE_GROUP "probe"

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bool probe_event_dry_run;	/* Dry run flag */
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struct probe_conf probe_conf;
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#define semantic_error(msg ...) pr_err("Semantic error :" msg)
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int e_snprintf(char *str, size_t size, const char *format, ...)
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{
	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;
}

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static struct machine *host_machine;
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/* Initialize symbol maps and path of vmlinux/modules */
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int init_probe_symbol_maps(bool user_only)
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{
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	int ret;

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	symbol_conf.sort_by_name = true;
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	symbol_conf.allow_aliases = true;
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	ret = symbol__init(NULL);
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	if (ret < 0) {
		pr_debug("Failed to init symbol map.\n");
		goto out;
	}
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	if (host_machine || user_only)	/* already initialized */
		return 0;
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	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;
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	}
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out:
	if (ret < 0)
		pr_warning("Failed to init vmlinux path.\n");
	return ret;
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}

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void exit_probe_symbol_maps(void)
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{
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	machine__delete(host_machine);
	host_machine = NULL;
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	symbol__exit();
}

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static struct symbol *__find_kernel_function_by_name(const char *name,
						     struct map **mapp)
{
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	return machine__find_kernel_function_by_name(host_machine, name, mapp,
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						     NULL);
}

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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;
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	struct map *map = machine__kernel_map(host_machine);
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	if (map__load(map, NULL) < 0)
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		return NULL;

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	kmap = map__kmap(map);
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	if (!kmap)
		return NULL;
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	return kmap->ref_reloc_sym;
}

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static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
					     bool reloc, bool reladdr)
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{
	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)
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		*addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
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	else {
		sym = __find_kernel_function_by_name(name, &map);
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		if (!sym)
			return -ENOENT;
		*addr = map->unmap_ip(map, sym->start) -
			((reloc) ? 0 : map->reloc) -
			((reladdr) ? map->start : 0);
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	}
	return 0;
}

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static struct map *kernel_get_module_map(const char *module)
{
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	struct map_groups *grp = &host_machine->kmaps;
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	struct maps *maps = &grp->maps[MAP__FUNCTION];
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	struct map *pos;
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	/* A file path -- this is an offline module */
	if (module && strchr(module, '/'))
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		return machine__findnew_module_map(host_machine, 0, module);
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	if (!module)
		module = "kernel";

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	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
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		if (strncmp(pos->dso->short_name + 1, module,
			    pos->dso->short_name_len - 2) == 0) {
			return pos;
		}
	}
	return NULL;
}

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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 */
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		map__put(map);
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	}
}


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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;
}

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static void clear_perf_probe_point(struct perf_probe_point *pp)
{
	free(pp->file);
	free(pp->function);
	free(pp->lazy_line);
}

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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);
}

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static bool kprobe_blacklist__listed(unsigned long address);
static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
{
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	u64 etext_addr = 0;
	int ret;
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	/* Get the address of _etext for checking non-probable text symbol */
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	ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
						false, false);
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	if (ret == 0 && etext_addr < address)
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		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;
}

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/*
 * 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.
 */
#ifdef __LP64__
#define MOD_NAME_OFFSET 24
#else
#define MOD_NAME_OFFSET 12
#endif

/*
 * @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;

	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;

	mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET);

ret_err:
	elf_end(elf);
elf_err:
	close(fd);
	return mod_name;
}

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#ifdef HAVE_DWARF_SUPPORT
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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) {
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		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;
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		}
		pr_debug("Failed to find module %s.\n", module);
		return -ENOENT;
	}

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	map = machine__kernel_map(host_machine);
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	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;
}

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/*
 * 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) {
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		if (uprobes)
			address = sym->start;
		else
			address = map->unmap_ip(map, sym->start);
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		break;
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	}
	if (!address) {
		ret = -ENOENT;
		goto out;
	}
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Wang Nan 已提交
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	pr_debug("Symbol %s address found : %" PRIx64 "\n",
			pp->function, address);
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	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;
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		result->retprobe = pp->retprobe;
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		ret = 0;
	}

out:
	put_target_map(map, uprobes);
	return ret;

}

static int get_alternative_probe_event(struct debuginfo *dinfo,
				       struct perf_probe_event *pev,
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				       struct perf_probe_point *tmp)
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{
	int ret;

	memcpy(tmp, &pev->point, sizeof(*tmp));
	memset(&pev->point, 0, sizeof(pev->point));
	ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
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					   pev->target, pev->uprobes);
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	if (ret < 0)
		memcpy(&pev->point, tmp, sizeof(*tmp));

	return ret;
}
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static int get_alternative_line_range(struct debuginfo *dinfo,
				      struct line_range *lr,
				      const char *target, bool user)
{
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	struct perf_probe_point pp = { .function = lr->function,
				       .file = lr->file,
				       .line = lr->start };
	struct perf_probe_point result;
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	int ret, len = 0;

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	memset(&result, 0, sizeof(result));

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	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;
}

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/* Open new debuginfo of given module */
459
static struct debuginfo *open_debuginfo(const char *module, bool silent)
460
{
461
	const char *path = module;
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	char reason[STRERR_BUFSIZE];
	struct debuginfo *ret = NULL;
	struct dso *dso = NULL;
	int err;
466

467
	if (!module || !strchr(module, '/')) {
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		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);
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			if (!silent)
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				pr_err("Failed to find the path for %s: %s\n",
					module ?: "kernel", reason);
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			return NULL;
		}
480
		path = dso->long_name;
481
	}
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	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;
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}
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/* 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)
{
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	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))
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		goto out;

	/* Copy module path */
	free(debuginfo_cache_path);
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	debuginfo_cache_path = strdup(path);
	if (!debuginfo_cache_path) {
		debuginfo__delete(debuginfo_cache);
		debuginfo_cache = NULL;
		goto out;
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	}

	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);
}

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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);
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	if (elf == NULL) {
		ret = -EINVAL;
		goto out_close;
	}
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	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);
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out_close:
	close(fd);

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	return ret;
}

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/*
 * 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;
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	} else if (tp->symbol) {
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		/* 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)
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			goto error;
		addr += tp->offset;
	}

	pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
		 tp->module ? : "kernel");

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	dinfo = debuginfo_cache__open(tp->module, verbose == 0);
	if (dinfo)
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		ret = debuginfo__find_probe_point(dinfo,
						 (unsigned long)addr, pp);
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	else
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		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;
}

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static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
					  int ntevs, const char *exec)
{
	int i, ret = 0;
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	unsigned long stext = 0;
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	if (!exec)
		return 0;

	ret = get_text_start_address(exec, &stext);
	if (ret < 0)
		return ret;

	for (i = 0; i < ntevs && ret >= 0; i++) {
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		/* point.address is the addres of point.symbol + point.offset */
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		tevs[i].point.address -= stext;
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		tevs[i].point.module = strdup(exec);
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		if (!tevs[i].point.module) {
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			ret = -ENOMEM;
			break;
		}
		tevs[i].uprobes = true;
	}

	return ret;
}

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static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
					    int ntevs, const char *module)
{
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	int i, ret = 0;
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	char *mod_name = NULL;
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	if (!module)
		return 0;

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	mod_name = find_module_name(module);
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	for (i = 0; i < ntevs; i++) {
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		tevs[i].point.module =
			strdup(mod_name ? mod_name : module);
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		if (!tevs[i].point.module) {
			ret = -ENOMEM;
			break;
		}
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	}
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	free(mod_name);
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	return ret;
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}

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/* 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;
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	int i, skipped = 0;
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	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);

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	reloc_sym = kernel_get_ref_reloc_sym();
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	if (!reloc_sym) {
		pr_warning("Relocated base symbol is not found!\n");
		return -EINVAL;
	}

	for (i = 0; i < ntevs; i++) {
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		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;
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		}
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		/* 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;
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	}
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	return skipped;
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}

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/* Try to find perf_probe_event with debuginfo */
715
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
716
					  struct probe_trace_event **tevs)
717 718
{
	bool need_dwarf = perf_probe_event_need_dwarf(pev);
719
	struct perf_probe_point tmp;
720
	struct debuginfo *dinfo;
721
	int ntevs, ret = 0;
722

723
	dinfo = open_debuginfo(pev->target, !need_dwarf);
724
	if (!dinfo) {
725
		if (need_dwarf)
726 727
			return -ENOENT;
		pr_debug("Could not open debuginfo. Try to use symbols.\n");
728 729 730
		return 0;
	}

731
	pr_debug("Try to find probe point from debuginfo.\n");
732
	/* Searching trace events corresponding to a probe event */
733
	ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
734

735
	if (ntevs == 0)	{  /* Not found, retry with an alternative */
736
		ret = get_alternative_probe_event(dinfo, pev, &tmp);
737
		if (!ret) {
738
			ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
739 740 741 742 743 744 745 746 747
			/*
			 * 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));
		}
	}

748
	debuginfo__delete(dinfo);
749

750
	if (ntevs > 0) {	/* Succeeded to find trace events */
751 752
		pr_debug("Found %d probe_trace_events.\n", ntevs);
		ret = post_process_probe_trace_events(*tevs, ntevs,
753
						pev->target, pev->uprobes);
754
		if (ret < 0 || ret == ntevs) {
755 756 757
			clear_probe_trace_events(*tevs, ntevs);
			zfree(tevs);
		}
758 759 760 761
		if (ret != ntevs)
			return ret < 0 ? ret : ntevs;
		ntevs = 0;
		/* Fall through */
762
	}
763

764
	if (ntevs == 0)	{	/* No error but failed to find probe point. */
765
		pr_warning("Probe point '%s' not found.\n",
766
			   synthesize_perf_probe_point(&pev->point));
767
		return -ENOENT;
768 769
	}
	/* Error path : ntevs < 0 */
770
	pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
771 772 773 774
	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");
775
		if (!need_dwarf) {
M
Masami Hiramatsu 已提交
776
			pr_debug("Trying to use symbols.\n");
777 778
			return 0;
		}
779
	}
780
	return ntevs;
781 782 783 784 785
}

#define LINEBUF_SIZE 256
#define NR_ADDITIONAL_LINES 2

786
static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
787
{
788
	char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
789 790
	const char *color = show_num ? "" : PERF_COLOR_BLUE;
	const char *prefix = NULL;
791

792
	do {
793 794
		if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
			goto error;
795 796 797 798 799
		if (skip)
			continue;
		if (!prefix) {
			prefix = show_num ? "%7d  " : "         ";
			color_fprintf(stdout, color, prefix, l);
800
		}
801 802 803
		color_fprintf(stdout, color, "%s", buf);

	} while (strchr(buf, '\n') == NULL);
804

805
	return 1;
806
error:
807
	if (ferror(fp)) {
808 809
		pr_warning("File read error: %s\n",
			   strerror_r(errno, sbuf, sizeof(sbuf)));
810 811 812 813
		return -1;
	}
	return 0;
}
814

815 816 817 818 819 820 821 822
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;
823 824
}

825 826 827 828 829
#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)

830 831 832 833
/*
 * Show line-range always requires debuginfo to find source file and
 * line number.
 */
834 835
static int __show_line_range(struct line_range *lr, const char *module,
			     bool user)
836
{
837
	int l = 1;
838
	struct int_node *ln;
839
	struct debuginfo *dinfo;
840
	FILE *fp;
841
	int ret;
842
	char *tmp;
843
	char sbuf[STRERR_BUFSIZE];
844 845

	/* Search a line range */
846 847
	dinfo = open_debuginfo(module, false);
	if (!dinfo)
848
		return -ENOENT;
849

850
	ret = debuginfo__find_line_range(dinfo, lr);
851 852 853 854 855
	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);
	}
856
	debuginfo__delete(dinfo);
857
	if (ret == 0 || ret == -ENOENT) {
858 859 860
		pr_warning("Specified source line is not found.\n");
		return -ENOENT;
	} else if (ret < 0) {
861
		pr_warning("Debuginfo analysis failed.\n");
862 863
		return ret;
	}
864

865 866
	/* Convert source file path */
	tmp = lr->path;
867
	ret = get_real_path(tmp, lr->comp_dir, &lr->path);
868 869 870 871 872

	/* Free old path when new path is assigned */
	if (tmp != lr->path)
		free(tmp);

873
	if (ret < 0) {
874
		pr_warning("Failed to find source file path.\n");
875 876 877
		return ret;
	}

878 879 880
	setup_pager();

	if (lr->function)
881
		fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
882 883
			lr->start - lr->offset);
	else
884
		fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
885 886

	fp = fopen(lr->path, "r");
887 888
	if (fp == NULL) {
		pr_warning("Failed to open %s: %s\n", lr->path,
889
			   strerror_r(errno, sbuf, sizeof(sbuf)));
890 891
		return -errno;
	}
892
	/* Skip to starting line number */
893
	while (l < lr->start) {
894
		ret = skip_one_line(fp, l++);
895 896 897
		if (ret < 0)
			goto end;
	}
898

899
	intlist__for_each_entry(ln, lr->line_list) {
900
		for (; ln->i > l; l++) {
901
			ret = show_one_line(fp, l - lr->offset);
902 903 904
			if (ret < 0)
				goto end;
		}
905
		ret = show_one_line_with_num(fp, l++ - lr->offset);
906 907
		if (ret < 0)
			goto end;
908 909 910 911
	}

	if (lr->end == INT_MAX)
		lr->end = l + NR_ADDITIONAL_LINES;
912 913 914
	while (l <= lr->end) {
		ret = show_one_line_or_eof(fp, l++ - lr->offset);
		if (ret <= 0)
915 916
			break;
	}
917
end:
918
	fclose(fp);
919
	return ret;
920 921
}

922
int show_line_range(struct line_range *lr, const char *module, bool user)
923 924 925
{
	int ret;

926
	ret = init_probe_symbol_maps(user);
927 928
	if (ret < 0)
		return ret;
929
	ret = __show_line_range(lr, module, user);
930
	exit_probe_symbol_maps();
931 932 933 934

	return ret;
}

935 936
static int show_available_vars_at(struct debuginfo *dinfo,
				  struct perf_probe_event *pev,
937
				  struct strfilter *_filter)
938 939
{
	char *buf;
940
	int ret, i, nvars;
941 942
	struct str_node *node;
	struct variable_list *vls = NULL, *vl;
943
	struct perf_probe_point tmp;
944
	const char *var;
945 946 947 948 949 950

	buf = synthesize_perf_probe_point(&pev->point);
	if (!buf)
		return -EINVAL;
	pr_debug("Searching variables at %s\n", buf);

951
	ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
952
	if (!ret) {  /* Not found, retry with an alternative */
953
		ret = get_alternative_probe_event(dinfo, pev, &tmp);
954 955
		if (!ret) {
			ret = debuginfo__find_available_vars_at(dinfo, pev,
956
								&vls);
957 958 959 960
			/* Release the old probe_point */
			clear_perf_probe_point(&tmp);
		}
	}
961
	if (ret <= 0) {
962 963 964 965 966
		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");
967 968
		goto end;
	}
969

970 971 972 973 974 975 976 977 978 979
	/* 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);
980
		zfree(&vl->point.symbol);
981 982
		nvars = 0;
		if (vl->vars) {
983
			strlist__for_each_entry(node, vl->vars) {
984 985
				var = strchr(node->s, '\t') + 1;
				if (strfilter__compare(_filter, var)) {
986
					fprintf(stdout, "\t\t%s\n", node->s);
987 988 989 990
					nvars++;
				}
			}
			strlist__delete(vl->vars);
991
		}
992 993 994 995 996
		if (nvars == 0)
			fprintf(stdout, "\t\t(No matched variables)\n");
	}
	free(vls);
end:
997 998 999 1000 1001 1002
	free(buf);
	return ret;
}

/* Show available variables on given probe point */
int show_available_vars(struct perf_probe_event *pevs, int npevs,
1003
			struct strfilter *_filter)
1004
{
1005 1006
	int i, ret = 0;
	struct debuginfo *dinfo;
1007

1008
	ret = init_probe_symbol_maps(pevs->uprobes);
1009 1010 1011
	if (ret < 0)
		return ret;

1012
	dinfo = open_debuginfo(pevs->target, false);
1013
	if (!dinfo) {
1014 1015
		ret = -ENOENT;
		goto out;
1016 1017
	}

1018 1019
	setup_pager();

1020
	for (i = 0; i < npevs && ret >= 0; i++)
1021
		ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1022 1023

	debuginfo__delete(dinfo);
1024
out:
1025
	exit_probe_symbol_maps();
1026 1027 1028
	return ret;
}

1029
#else	/* !HAVE_DWARF_SUPPORT */
1030

1031 1032 1033 1034
static void debuginfo_cache__exit(void)
{
}

1035 1036 1037 1038
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)
1039
{
1040
	return -ENOSYS;
1041 1042
}

1043
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1044
				struct probe_trace_event **tevs __maybe_unused)
1045
{
1046 1047 1048 1049
	if (perf_probe_event_need_dwarf(pev)) {
		pr_warning("Debuginfo-analysis is not supported.\n");
		return -ENOSYS;
	}
1050

1051 1052 1053
	return 0;
}

1054
int show_line_range(struct line_range *lr __maybe_unused,
1055 1056
		    const char *module __maybe_unused,
		    bool user __maybe_unused)
1057
{
1058 1059
	pr_warning("Debuginfo-analysis is not supported.\n");
	return -ENOSYS;
1060 1061
}

1062
int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1063 1064
			int npevs __maybe_unused,
			struct strfilter *filter __maybe_unused)
1065 1066 1067 1068
{
	pr_warning("Debuginfo-analysis is not supported.\n");
	return -ENOSYS;
}
1069 1070
#endif

1071 1072 1073 1074 1075 1076
void line_range__clear(struct line_range *lr)
{
	free(lr->function);
	free(lr->file);
	free(lr->path);
	free(lr->comp_dir);
1077
	intlist__delete(lr->line_list);
1078 1079 1080
	memset(lr, 0, sizeof(*lr));
}

1081
int line_range__init(struct line_range *lr)
1082 1083
{
	memset(lr, 0, sizeof(*lr));
1084 1085 1086 1087 1088
	lr->line_list = intlist__new(NULL);
	if (!lr->line_list)
		return -ENOMEM;
	else
		return 0;
1089 1090
}

1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
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;
}

1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
/* 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;
}

1116 1117 1118 1119 1120
/*
 * Stuff 'lr' according to the line range described by 'arg'.
 * The line range syntax is described by:
 *
 *         SRC[:SLN[+NUM|-ELN]]
1121
 *         FNC[@SRC][:SLN[+NUM|-ELN]]
1122
 */
1123
int parse_line_range_desc(const char *arg, struct line_range *lr)
1124
{
1125
	char *range, *file, *name = strdup(arg);
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
	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--;
			}
		}
1160

1161
		pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1162 1163

		err = -EINVAL;
1164
		if (lr->start > lr->end) {
1165
			semantic_error("Start line must be smaller"
1166
				       " than end line.\n");
1167
			goto err;
1168
		}
1169 1170 1171
		if (*range != '\0') {
			semantic_error("Tailing with invalid str '%s'.\n", range);
			goto err;
1172
		}
1173
	}
1174

1175 1176 1177 1178 1179 1180 1181 1182 1183
	file = strchr(name, '@');
	if (file) {
		*file = '\0';
		lr->file = strdup(++file);
		if (lr->file == NULL) {
			err = -ENOMEM;
			goto err;
		}
		lr->function = name;
1184
	} else if (strchr(name, '/') || strchr(name, '.'))
1185
		lr->file = name;
1186
	else if (is_c_func_name(name))/* We reuse it for checking funcname */
1187
		lr->function = name;
1188 1189 1190 1191 1192
	else {	/* Invalid name */
		semantic_error("'%s' is not a valid function name.\n", name);
		err = -EINVAL;
		goto err;
	}
1193 1194

	return 0;
1195 1196 1197
err:
	free(name);
	return err;
1198 1199
}

1200
/* Parse probepoint definition. */
1201
static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1202
{
1203
	struct perf_probe_point *pp = &pev->point;
1204 1205
	char *ptr, *tmp;
	char c, nc = 0;
1206
	bool file_spec = false;
1207 1208
	/*
	 * <Syntax>
1209 1210
	 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
	 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1211
	 */
1212 1213
	if (!arg)
		return -EINVAL;
1214

1215 1216
	ptr = strpbrk(arg, ";=@+%");
	if (ptr && *ptr == '=') {	/* Event name */
1217 1218
		*ptr = '\0';
		tmp = ptr + 1;
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
		ptr = strchr(arg, ':');
		if (ptr) {
			*ptr = '\0';
			if (!is_c_func_name(arg))
				goto not_fname;
			pev->group = strdup(arg);
			if (!pev->group)
				return -ENOMEM;
			arg = ptr + 1;
		} else
			pev->group = NULL;
1230
		if (!is_c_func_name(arg)) {
1231
not_fname:
1232
			semantic_error("%s is bad for event name -it must "
1233 1234 1235
				       "follow C symbol-naming rule.\n", arg);
			return -EINVAL;
		}
1236 1237 1238
		pev->event = strdup(arg);
		if (pev->event == NULL)
			return -ENOMEM;
1239 1240 1241
		arg = tmp;
	}

1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
	/*
	 * 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;
	}

1259
	ptr = strpbrk(arg, ";:+@%");
1260 1261 1262 1263 1264
	if (ptr) {
		nc = *ptr;
		*ptr++ = '\0';
	}

1265 1266 1267 1268 1269 1270 1271
	if (arg[0] == '\0')
		tmp = NULL;
	else {
		tmp = strdup(arg);
		if (tmp == NULL)
			return -ENOMEM;
	}
1272

1273
	if (file_spec)
1274
		pp->file = tmp;
1275
	else {
1276
		pp->function = tmp;
1277

1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		/*
		 * 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;
			}
		}
	}

1296 1297 1298 1299
	/* Parse other options */
	while (ptr) {
		arg = ptr;
		c = nc;
1300
		if (c == ';') {	/* Lazy pattern must be the last part */
1301 1302 1303
			pp->lazy_line = strdup(arg);
			if (pp->lazy_line == NULL)
				return -ENOMEM;
1304 1305 1306
			break;
		}
		ptr = strpbrk(arg, ";:+@%");
1307 1308 1309 1310 1311 1312 1313
		if (ptr) {
			nc = *ptr;
			*ptr++ = '\0';
		}
		switch (c) {
		case ':':	/* Line number */
			pp->line = strtoul(arg, &tmp, 0);
1314
			if (*tmp != '\0') {
1315
				semantic_error("There is non-digit char"
1316 1317 1318
					       " in line number.\n");
				return -EINVAL;
			}
1319 1320 1321
			break;
		case '+':	/* Byte offset from a symbol */
			pp->offset = strtoul(arg, &tmp, 0);
1322
			if (*tmp != '\0') {
1323
				semantic_error("There is non-digit character"
1324 1325 1326
						" in offset.\n");
				return -EINVAL;
			}
1327 1328
			break;
		case '@':	/* File name */
1329 1330 1331 1332
			if (pp->file) {
				semantic_error("SRC@SRC is not allowed.\n");
				return -EINVAL;
			}
1333 1334 1335
			pp->file = strdup(arg);
			if (pp->file == NULL)
				return -ENOMEM;
1336 1337 1338 1339
			break;
		case '%':	/* Probe places */
			if (strcmp(arg, "return") == 0) {
				pp->retprobe = 1;
1340 1341 1342 1343
			} else {	/* Others not supported yet */
				semantic_error("%%%s is not supported.\n", arg);
				return -ENOTSUP;
			}
1344
			break;
1345 1346 1347 1348
		default:	/* Buggy case */
			pr_err("This program has a bug at %s:%d.\n",
				__FILE__, __LINE__);
			return -ENOTSUP;
1349 1350 1351 1352 1353
			break;
		}
	}

	/* Exclusion check */
1354
	if (pp->lazy_line && pp->line) {
M
Masami Hiramatsu 已提交
1355 1356
		semantic_error("Lazy pattern can't be used with"
			       " line number.\n");
1357 1358
		return -EINVAL;
	}
1359

1360
	if (pp->lazy_line && pp->offset) {
M
Masami Hiramatsu 已提交
1361
		semantic_error("Lazy pattern can't be used with offset.\n");
1362 1363
		return -EINVAL;
	}
1364

1365
	if (pp->line && pp->offset) {
M
Masami Hiramatsu 已提交
1366
		semantic_error("Offset can't be used with line number.\n");
1367 1368
		return -EINVAL;
	}
1369

1370
	if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1371
		semantic_error("File always requires line number or "
M
Masami Hiramatsu 已提交
1372
			       "lazy pattern.\n");
1373 1374
		return -EINVAL;
	}
1375

1376
	if (pp->offset && !pp->function) {
M
Masami Hiramatsu 已提交
1377
		semantic_error("Offset requires an entry function.\n");
1378 1379
		return -EINVAL;
	}
1380

1381
	if (pp->retprobe && !pp->function) {
M
Masami Hiramatsu 已提交
1382
		semantic_error("Return probe requires an entry function.\n");
1383 1384
		return -EINVAL;
	}
1385

1386
	if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1387
		semantic_error("Offset/Line/Lazy pattern can't be used with "
M
Masami Hiramatsu 已提交
1388
			       "return probe.\n");
1389 1390
		return -EINVAL;
	}
1391

1392
	pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1393 1394
		 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
		 pp->lazy_line);
1395
	return 0;
1396 1397
}

1398
/* Parse perf-probe event argument */
1399
static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1400
{
1401
	char *tmp, *goodname;
1402 1403 1404 1405
	struct perf_probe_arg_field **fieldp;

	pr_debug("parsing arg: %s into ", str);

1406 1407
	tmp = strchr(str, '=');
	if (tmp) {
1408 1409 1410
		arg->name = strndup(str, tmp - str);
		if (arg->name == NULL)
			return -ENOMEM;
1411
		pr_debug("name:%s ", arg->name);
1412 1413 1414
		str = tmp + 1;
	}

1415 1416 1417
	tmp = strchr(str, ':');
	if (tmp) {	/* Type setting */
		*tmp = '\0';
1418 1419 1420
		arg->type = strdup(tmp + 1);
		if (arg->type == NULL)
			return -ENOMEM;
1421 1422 1423
		pr_debug("type:%s ", arg->type);
	}

1424
	tmp = strpbrk(str, "-.[");
1425 1426
	if (!is_c_varname(str) || !tmp) {
		/* A variable, register, symbol or special value */
1427 1428 1429
		arg->var = strdup(str);
		if (arg->var == NULL)
			return -ENOMEM;
1430
		pr_debug("%s\n", arg->var);
1431
		return 0;
1432 1433
	}

1434
	/* Structure fields or array element */
1435 1436 1437
	arg->var = strndup(str, tmp - str);
	if (arg->var == NULL)
		return -ENOMEM;
1438
	goodname = arg->var;
1439
	pr_debug("%s, ", arg->var);
1440 1441 1442
	fieldp = &arg->field;

	do {
1443 1444 1445
		*fieldp = zalloc(sizeof(struct perf_probe_arg_field));
		if (*fieldp == NULL)
			return -ENOMEM;
1446 1447 1448
		if (*tmp == '[') {	/* Array */
			str = tmp;
			(*fieldp)->index = strtol(str + 1, &tmp, 0);
1449
			(*fieldp)->ref = true;
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
			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, "-.[");
1471
		}
1472
		if (tmp) {
1473 1474 1475
			(*fieldp)->name = strndup(str, tmp - str);
			if ((*fieldp)->name == NULL)
				return -ENOMEM;
1476 1477
			if (*str != '[')
				goodname = (*fieldp)->name;
1478 1479 1480 1481
			pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
			fieldp = &(*fieldp)->next;
		}
	} while (tmp);
1482 1483 1484
	(*fieldp)->name = strdup(str);
	if ((*fieldp)->name == NULL)
		return -ENOMEM;
1485 1486
	if (*str != '[')
		goodname = (*fieldp)->name;
1487
	pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1488

1489
	/* If no name is specified, set the last field name (not array index)*/
1490
	if (!arg->name) {
1491
		arg->name = strdup(goodname);
1492 1493 1494
		if (arg->name == NULL)
			return -ENOMEM;
	}
1495
	return 0;
1496 1497
}

1498
/* Parse perf-probe event command */
1499
int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1500
{
1501
	char **argv;
1502
	int argc, i, ret = 0;
1503

1504
	argv = argv_split(cmd, &argc);
1505 1506 1507 1508 1509 1510 1511 1512 1513
	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;
	}
1514
	/* Parse probe point */
1515 1516 1517
	ret = parse_perf_probe_point(argv[0], pev);
	if (ret < 0)
		goto out;
1518

1519
	/* Copy arguments and ensure return probe has no C argument */
1520
	pev->nargs = argc - 1;
1521 1522 1523 1524 1525
	pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
	if (pev->args == NULL) {
		ret = -ENOMEM;
		goto out;
	}
1526 1527 1528 1529
	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) {
1530
			semantic_error("You can't specify local variable for"
1531 1532 1533
				       " kretprobe.\n");
			ret = -EINVAL;
		}
1534
	}
1535
out:
1536
	argv_free(argv);
1537 1538

	return ret;
1539 1540
}

1541 1542 1543 1544 1545 1546 1547 1548 1549
/* 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++)
1550
		if (is_c_varname(pev->args[i].var))
1551 1552 1553 1554 1555
			return true;

	return false;
}

1556
/* Parse probe_events event into struct probe_point */
1557
int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1558
{
1559
	struct probe_trace_point *tp = &tev->point;
1560 1561
	char pr;
	char *p;
1562
	char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1563 1564 1565
	int ret, i, argc;
	char **argv;

1566
	pr_debug("Parsing probe_events: %s\n", cmd);
1567
	argv = argv_split(cmd, &argc);
1568 1569 1570 1571 1572 1573 1574 1575 1576
	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;
	}
1577 1578

	/* Scan event and group name. */
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
	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) {
1589 1590 1591 1592
		semantic_error("Failed to parse event name: %s\n", argv[0]);
		ret = -EINVAL;
		goto out;
	}
1593 1594 1595 1596 1597 1598 1599
	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;
	}
1600
	pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1601

1602
	tp->retprobe = (pr == 'r');
1603

1604 1605 1606 1607
	/* Scan module name(if there), function name and offset */
	p = strchr(argv[1], ':');
	if (p) {
		tp->module = strndup(argv[1], p - argv[1]);
1608 1609 1610 1611
		if (!tp->module) {
			ret = -ENOMEM;
			goto out;
		}
1612 1613 1614
		p++;
	} else
		p = argv[1];
1615
	fmt1_str = strtok_r(p, "+", &fmt);
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
	/* 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 {
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
		/* 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);
1652
	}
1653

1654
	tev->nargs = argc - 2;
1655
	tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1656 1657 1658 1659
	if (tev->args == NULL) {
		ret = -ENOMEM;
		goto out;
	}
1660
	for (i = 0; i < tev->nargs; i++) {
1661 1662
		p = strchr(argv[i + 2], '=');
		if (p)	/* We don't need which register is assigned. */
1663 1664 1665
			*p++ = '\0';
		else
			p = argv[i + 2];
1666
		tev->args[i].name = strdup(argv[i + 2]);
1667
		/* TODO: parse regs and offset */
1668 1669 1670 1671 1672
		tev->args[i].value = strdup(p);
		if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
			ret = -ENOMEM;
			goto out;
		}
1673
	}
1674 1675
	ret = 0;
out:
1676
	free(argv0_str);
1677
	argv_free(argv);
1678
	return ret;
1679 1680
}

1681
/* Compose only probe arg */
1682
char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1683 1684
{
	struct perf_probe_arg_field *field = pa->field;
1685
	struct strbuf buf;
1686 1687 1688 1689 1690
	char *ret = NULL;
	int err;

	if (strbuf_init(&buf, 64) < 0)
		return NULL;
1691

1692
	if (pa->name && pa->var)
1693
		err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1694
	else
1695 1696 1697
		err = strbuf_addstr(&buf, pa->name ?: pa->var);
	if (err)
		goto out;
1698 1699

	while (field) {
1700
		if (field->name[0] == '[')
1701
			err = strbuf_addstr(&buf, field->name);
1702
		else
1703 1704
			err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
					  field->name);
1705
		field = field->next;
1706 1707
		if (err)
			goto out;
1708
	}
1709

1710
	if (pa->type)
1711 1712
		if (strbuf_addf(&buf, ":%s", pa->type) < 0)
			goto out;
1713 1714

	ret = strbuf_detach(&buf, NULL);
1715 1716
out:
	strbuf_release(&buf);
1717
	return ret;
1718 1719
}

1720
/* Compose only probe point (not argument) */
1721
char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1722
{
1723
	struct strbuf buf;
1724 1725 1726 1727 1728
	char *tmp, *ret = NULL;
	int len, err = 0;

	if (strbuf_init(&buf, 64) < 0)
		return NULL;
1729 1730

	if (pp->function) {
1731 1732
		if (strbuf_addstr(&buf, pp->function) < 0)
			goto out;
1733
		if (pp->offset)
1734
			err = strbuf_addf(&buf, "+%lu", pp->offset);
1735
		else if (pp->line)
1736
			err = strbuf_addf(&buf, ":%d", pp->line);
1737
		else if (pp->retprobe)
1738 1739 1740
			err = strbuf_addstr(&buf, "%return");
		if (err)
			goto out;
1741 1742
	}
	if (pp->file) {
1743 1744 1745 1746 1747 1748
		tmp = pp->file;
		len = strlen(tmp);
		if (len > 30) {
			tmp = strchr(pp->file + len - 30, '/');
			tmp = tmp ? tmp + 1 : pp->file + len - 30;
		}
1749 1750 1751
		err = strbuf_addf(&buf, "@%s", tmp);
		if (!err && !pp->function && pp->line)
			err = strbuf_addf(&buf, ":%d", pp->line);
1752
	}
1753 1754 1755 1756 1757
	if (!err)
		ret = strbuf_detach(&buf, NULL);
out:
	strbuf_release(&buf);
	return ret;
1758 1759
}

1760
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1761
{
1762 1763 1764
	struct strbuf buf;
	char *tmp, *ret = NULL;
	int i;
1765

1766
	if (strbuf_init(&buf, 64))
1767
		return NULL;
1768 1769 1770 1771 1772 1773 1774 1775 1776
	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);
1777

1778
	for (i = 0; i < pev->nargs; i++) {
1779 1780 1781 1782
		tmp = synthesize_perf_probe_arg(pev->args + i);
		if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
			goto out;
		free(tmp);
1783 1784
	}

1785 1786 1787 1788
	ret = strbuf_detach(&buf, NULL);
out:
	strbuf_release(&buf);
	return ret;
1789 1790
}

1791
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1792
					    struct strbuf *buf, int depth)
1793
{
1794
	int err;
1795
	if (ref->next) {
1796
		depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1797
							 depth + 1);
1798
		if (depth < 0)
1799
			return depth;
1800
	}
1801 1802
	err = strbuf_addf(buf, "%+ld(", ref->offset);
	return (err < 0) ? err : depth;
1803 1804
}

1805
static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1806
				      struct strbuf *buf)
1807
{
1808
	struct probe_trace_arg_ref *ref = arg->ref;
1809
	int depth = 0, err;
1810 1811 1812

	/* Argument name or separator */
	if (arg->name)
1813
		err = strbuf_addf(buf, " %s=", arg->name);
1814
	else
1815 1816 1817
		err = strbuf_addch(buf, ' ');
	if (err)
		return err;
1818

1819 1820 1821 1822
	/* Special case: @XXX */
	if (arg->value[0] == '@' && arg->ref)
			ref = ref->next;

1823
	/* Dereferencing arguments */
1824
	if (ref) {
1825
		depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1826 1827 1828 1829 1830
		if (depth < 0)
			return depth;
	}

	/* Print argument value */
1831
	if (arg->value[0] == '@' && arg->ref)
1832
		err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
1833
	else
1834
		err = strbuf_addstr(buf, arg->value);
1835 1836

	/* Closing */
1837 1838 1839
	while (!err && depth--)
		err = strbuf_addch(buf, ')');

1840
	/* Print argument type */
1841 1842
	if (!err && arg->type)
		err = strbuf_addf(buf, ":%s", arg->type);
1843

1844
	return err;
1845 1846
}

1847
char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1848
{
1849
	struct probe_trace_point *tp = &tev->point;
1850 1851
	struct strbuf buf;
	char *ret = NULL;
1852
	int i, err;
1853

1854 1855
	/* Uprobes must have tp->module */
	if (tev->uprobes && !tp->module)
1856 1857
		return NULL;

1858 1859 1860 1861 1862 1863
	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;
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
	/*
	 * 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;
	}
1874 1875

	/* Use the tp->address for uprobes */
1876
	if (tev->uprobes)
1877
		err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
1878 1879
	else if (!strncmp(tp->symbol, "0x", 2))
		/* Absolute address. See try_to_find_absolute_address() */
1880 1881
		err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
				  tp->module ? ":" : "", tp->address);
1882
	else
1883 1884 1885 1886
		err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
				tp->module ? ":" : "", tp->symbol, tp->offset);
	if (err)
		goto error;
1887

1888 1889
	for (i = 0; i < tev->nargs; i++)
		if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
1890 1891
			goto error;

1892
	ret = strbuf_detach(&buf, NULL);
1893
error:
1894 1895
	strbuf_release(&buf);
	return ret;
1896
}
1897

1898 1899 1900 1901 1902 1903
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;
1904
	u64 addr = tp->address;
1905 1906 1907 1908 1909 1910 1911 1912
	int ret = -ENOENT;

	if (!is_kprobe) {
		map = dso__new_map(tp->module);
		if (!map)
			goto out;
		sym = map__find_symbol(map, addr, NULL);
	} else {
1913
		if (tp->symbol && !addr) {
1914 1915
			if (kernel_get_symbol_address_by_name(tp->symbol,
						&addr, true, false) < 0)
1916 1917
				goto out;
		}
1918 1919 1920 1921 1922
		if (addr) {
			addr += tp->offset;
			sym = __find_kernel_function(addr, &map);
		}
	}
1923

1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
	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) {
1934
		map__put(map);
1935 1936 1937 1938 1939 1940
	}

	return ret;
}

static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1941 1942
				       struct perf_probe_point *pp,
				       bool is_kprobe)
1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958
{
	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;
1959
	} else {
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973
		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;
}

1974
static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1975
			       struct perf_probe_event *pev, bool is_kprobe)
1976
{
1977
	struct strbuf buf = STRBUF_INIT;
1978
	int i, ret;
1979

1980
	/* Convert event/group name */
1981 1982 1983 1984
	pev->event = strdup(tev->event);
	pev->group = strdup(tev->group);
	if (pev->event == NULL || pev->group == NULL)
		return -ENOMEM;
1985

1986
	/* Convert trace_point to probe_point */
1987
	ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
1988 1989
	if (ret < 0)
		return ret;
1990

1991 1992
	/* Convert trace_arg to probe_arg */
	pev->nargs = tev->nargs;
1993 1994 1995
	pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
	if (pev->args == NULL)
		return -ENOMEM;
1996
	for (i = 0; i < tev->nargs && ret >= 0; i++) {
1997
		if (tev->args[i].name)
1998
			pev->args[i].name = strdup(tev->args[i].name);
1999
		else {
2000 2001
			if ((ret = strbuf_init(&buf, 32)) < 0)
				goto error;
2002 2003
			ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
			pev->args[i].name = strbuf_detach(&buf, NULL);
2004
		}
2005 2006 2007
		if (pev->args[i].name == NULL && ret >= 0)
			ret = -ENOMEM;
	}
2008
error:
2009 2010 2011 2012
	if (ret < 0)
		clear_perf_probe_event(pev);

	return ret;
2013 2014 2015 2016
}

void clear_perf_probe_event(struct perf_probe_event *pev)
{
2017
	struct perf_probe_arg_field *field, *next;
2018 2019
	int i;

2020 2021
	free(pev->event);
	free(pev->group);
2022
	free(pev->target);
2023
	clear_perf_probe_point(&pev->point);
2024

2025
	for (i = 0; i < pev->nargs; i++) {
2026 2027 2028
		free(pev->args[i].name);
		free(pev->args[i].var);
		free(pev->args[i].type);
2029 2030 2031
		field = pev->args[i].field;
		while (field) {
			next = field->next;
2032
			zfree(&field->name);
2033 2034 2035 2036
			free(field);
			field = next;
		}
	}
2037
	free(pev->args);
2038 2039 2040
	memset(pev, 0, sizeof(*pev));
}

2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113
#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;
}

2114
void clear_probe_trace_event(struct probe_trace_event *tev)
2115
{
2116
	struct probe_trace_arg_ref *ref, *next;
2117 2118
	int i;

2119 2120 2121
	free(tev->event);
	free(tev->group);
	free(tev->point.symbol);
2122
	free(tev->point.realname);
2123
	free(tev->point.module);
2124
	for (i = 0; i < tev->nargs; i++) {
2125 2126 2127
		free(tev->args[i].name);
		free(tev->args[i].value);
		free(tev->args[i].type);
2128 2129 2130 2131 2132 2133 2134
		ref = tev->args[i].ref;
		while (ref) {
			next = ref->next;
			free(ref);
			ref = next;
		}
	}
2135
	free(tev->args);
2136
	memset(tev, 0, sizeof(*tev));
2137 2138
}

2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161
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;
2162
	const char *__debugfs = debugfs__mountpoint();
2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227
	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;
}

2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248
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);
}

2249 2250
static int perf_probe_event__sprintf(const char *group, const char *event,
				     struct perf_probe_event *pev,
2251 2252
				     const char *module,
				     struct strbuf *result)
2253
{
2254
	int i, ret;
2255
	char *buf;
2256

2257 2258
	if (asprintf(&buf, "%s:%s", group, event) < 0)
		return -errno;
2259
	ret = strbuf_addf(result, "  %-20s (on ", buf);
2260
	free(buf);
2261 2262
	if (ret)
		return ret;
2263

2264 2265 2266 2267
	/* Synthesize only event probe point */
	buf = synthesize_perf_probe_point(&pev->point);
	if (!buf)
		return -ENOMEM;
2268
	ret = strbuf_addstr(result, buf);
2269
	free(buf);
2270

2271 2272
	if (!ret && module)
		ret = strbuf_addf(result, " in %s", module);
2273

2274 2275 2276
	if (!ret && pev->nargs > 0) {
		ret = strbuf_add(result, " with", 5);
		for (i = 0; !ret && i < pev->nargs; i++) {
2277 2278 2279
			buf = synthesize_perf_probe_arg(&pev->args[i]);
			if (!buf)
				return -ENOMEM;
2280
			ret = strbuf_addf(result, " %s", buf);
2281
			free(buf);
2282
		}
2283
	}
2284 2285
	if (!ret)
		ret = strbuf_addch(result, ')');
2286

2287
	return ret;
2288 2289
}

2290
/* Show an event */
2291 2292 2293
int show_perf_probe_event(const char *group, const char *event,
			  struct perf_probe_event *pev,
			  const char *module, bool use_stdout)
2294 2295 2296 2297
{
	struct strbuf buf = STRBUF_INIT;
	int ret;

2298
	ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309
	if (ret >= 0) {
		if (use_stdout)
			printf("%s\n", buf.buf);
		else
			pr_info("%s\n", buf.buf);
	}
	strbuf_release(&buf);

	return ret;
}

2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
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)
2327
{
2328
	int ret = 0;
2329
	struct probe_trace_event tev;
2330
	struct perf_probe_event pev;
2331 2332 2333
	struct strlist *rawlist;
	struct str_node *ent;

2334 2335
	memset(&tev, 0, sizeof(tev));
	memset(&pev, 0, sizeof(pev));
2336

2337
	rawlist = probe_file__get_rawlist(fd);
2338
	if (!rawlist)
2339
		return -ENOMEM;
2340

2341
	strlist__for_each_entry(ent, rawlist) {
2342
		ret = parse_probe_trace_command(ent->s, &tev);
2343
		if (ret >= 0) {
2344 2345
			if (!filter_probe_trace_event(&tev, filter))
				goto next;
2346 2347
			ret = convert_to_perf_probe_event(&tev, &pev,
								is_kprobe);
2348 2349
			if (ret < 0)
				goto next;
2350 2351
			ret = show_perf_probe_event(pev.group, pev.event,
						    &pev, tev.point.module,
2352
						    true);
2353
		}
2354
next:
2355
		clear_perf_probe_event(&pev);
2356
		clear_probe_trace_event(&tev);
2357 2358
		if (ret < 0)
			break;
2359 2360
	}
	strlist__delete(rawlist);
2361 2362
	/* Cleanup cached debuginfo if needed */
	debuginfo_cache__exit();
2363 2364

	return ret;
2365 2366
}

2367
/* List up current perf-probe events */
2368
int show_perf_probe_events(struct strfilter *filter)
2369
{
2370
	int kp_fd, up_fd, ret;
2371 2372 2373

	setup_pager();

2374 2375 2376
	if (probe_conf.cache)
		return probe_cache__show_all_caches(filter);

2377
	ret = init_probe_symbol_maps(false);
2378 2379 2380
	if (ret < 0)
		return ret;

2381 2382 2383
	ret = probe_file__open_both(&kp_fd, &up_fd, 0);
	if (ret < 0)
		return ret;
2384

2385 2386 2387
	if (kp_fd >= 0)
		ret = __show_perf_probe_events(kp_fd, true, filter);
	if (up_fd >= 0 && ret >= 0)
2388
		ret = __show_perf_probe_events(up_fd, false, filter);
2389 2390 2391
	if (kp_fd > 0)
		close(kp_fd);
	if (up_fd > 0)
2392
		close(up_fd);
2393
	exit_probe_symbol_maps();
2394

2395
	return ret;
2396 2397
}

2398 2399
static int get_new_event_name(char *buf, size_t len, const char *base,
			      struct strlist *namelist, bool allow_suffix)
2400 2401
{
	int i, ret;
2402
	char *p, *nbase;
2403

2404 2405
	if (*base == '.')
		base++;
2406 2407 2408 2409 2410 2411 2412 2413
	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';
2414

2415 2416
	/* Try no suffix number */
	ret = e_snprintf(buf, len, "%s", nbase);
2417
	if (ret < 0) {
2418
		pr_debug("snprintf() failed: %d\n", ret);
2419
		goto out;
2420
	}
2421
	if (!strlist__has_entry(namelist, buf))
2422
		goto out;
2423

2424
	if (!allow_suffix) {
2425 2426 2427 2428 2429
		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);
2430 2431
		ret = -EEXIST;
		goto out;
2432 2433
	}

2434 2435
	/* Try to add suffix */
	for (i = 1; i < MAX_EVENT_INDEX; i++) {
2436
		ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2437
		if (ret < 0) {
2438
			pr_debug("snprintf() failed: %d\n", ret);
2439
			goto out;
2440
		}
2441 2442 2443
		if (!strlist__has_entry(namelist, buf))
			break;
	}
2444 2445 2446 2447 2448
	if (i == MAX_EVENT_INDEX) {
		pr_warning("Too many events are on the same function.\n");
		ret = -ERANGE;
	}

2449 2450
out:
	free(nbase);
2451
	return ret;
2452 2453
}

2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474
/* 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);
}

2475 2476 2477 2478 2479 2480 2481 2482 2483 2484
/* 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;

2485
	/* If probe_event or trace_event already have the name, reuse it */
2486 2487
	if (pev->event)
		event = pev->event;
2488 2489 2490 2491
	else if (tev->event)
		event = tev->event;
	else {
		/* Or generate new one from probe point */
2492 2493 2494
		if (pev->point.function &&
			(strncmp(pev->point.function, "0x", 2) != 0) &&
			!strisglob(pev->point.function))
2495 2496 2497
			event = pev->point.function;
		else
			event = tev->point.realname;
2498
	}
2499 2500
	if (pev->group)
		group = pev->group;
2501 2502
	else if (tev->group)
		group = tev->group;
2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523
	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;
}

2524 2525
static int __add_probe_trace_events(struct perf_probe_event *pev,
				     struct probe_trace_event *tevs,
2526
				     int ntevs, bool allow_suffix)
2527
{
2528
	int i, fd, ret;
2529
	struct probe_trace_event *tev = NULL;
2530
	struct probe_cache *cache = NULL;
2531
	struct strlist *namelist;
2532

2533 2534
	fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
	if (fd < 0)
2535
		return fd;
2536

2537
	/* Get current event names */
2538
	namelist = probe_file__get_namelist(fd);
2539 2540
	if (!namelist) {
		pr_debug("Failed to get current event list.\n");
2541 2542
		ret = -ENOMEM;
		goto close_out;
2543
	}
2544

2545
	ret = 0;
2546
	for (i = 0; i < ntevs; i++) {
2547
		tev = &tevs[i];
2548
		/* Skip if the symbol is out of .text or blacklisted */
2549
		if (!tev->point.symbol && !pev->uprobes)
2550
			continue;
2551

2552 2553 2554
		/* Set new name for tev (and update namelist) */
		ret = probe_trace_event__set_name(tev, pev, namelist,
						  allow_suffix);
2555 2556
		if (ret < 0)
			break;
2557

2558
		ret = probe_file__add_event(fd, tev);
2559 2560
		if (ret < 0)
			break;
2561 2562 2563 2564 2565 2566 2567 2568

		/*
		 * 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;
2569
	}
2570 2571
	if (ret == -EINVAL && pev->uprobes)
		warn_uprobe_event_compat(tev);
2572 2573 2574 2575 2576 2577 2578 2579
	if (ret == 0 && probe_conf.cache) {
		cache = probe_cache__new(pev->target);
		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);
	}
2580

2581
	strlist__delete(namelist);
2582
close_out:
2583
	close(fd);
2584
	return ret;
2585
}
2586

2587 2588
static int find_probe_functions(struct map *map, char *name,
				struct symbol **syms)
2589
{
2590
	int found = 0;
2591
	struct symbol *sym;
2592
	struct rb_node *tmp;
2593

2594 2595 2596
	if (map__load(map, NULL) < 0)
		return 0;

2597
	map__for_each_symbol(map, sym, tmp) {
2598
		if (strglobmatch(sym->name, name)) {
2599
			found++;
2600 2601 2602
			if (syms && found < probe_conf.max_probes)
				syms[found - 1] = sym;
		}
2603
	}
2604 2605

	return found;
2606 2607
}

2608 2609
void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
				struct probe_trace_event *tev __maybe_unused,
2610 2611
				struct map *map __maybe_unused,
				struct symbol *sym __maybe_unused) { }
2612

2613 2614 2615 2616 2617
/*
 * 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,
2618
					    struct probe_trace_event **tevs)
2619
{
2620 2621
	struct map *map = NULL;
	struct ref_reloc_sym *reloc_sym = NULL;
2622
	struct symbol *sym;
2623
	struct symbol **syms = NULL;
2624
	struct probe_trace_event *tev;
2625 2626
	struct perf_probe_point *pp = &pev->point;
	struct probe_trace_point *tp;
2627
	int num_matched_functions;
2628
	int ret, i, j, skipped = 0;
2629
	char *mod_name;
2630

2631
	map = get_target_map(pev->target, pev->uprobes);
2632 2633 2634
	if (!map) {
		ret = -EINVAL;
		goto out;
2635 2636
	}

2637 2638 2639 2640 2641 2642
	syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
	if (!syms) {
		ret = -ENOMEM;
		goto out;
	}

2643 2644 2645 2646
	/*
	 * Load matched symbols: Since the different local symbols may have
	 * same name but different addresses, this lists all the symbols.
	 */
2647
	num_matched_functions = find_probe_functions(map, pp->function, syms);
2648
	if (num_matched_functions == 0) {
2649
		pr_err("Failed to find symbol %s in %s\n", pp->function,
2650
			pev->target ? : "kernel");
2651 2652
		ret = -ENOENT;
		goto out;
2653
	} else if (num_matched_functions > probe_conf.max_probes) {
2654
		pr_err("Too many functions matched in %s\n",
2655
			pev->target ? : "kernel");
2656 2657
		ret = -E2BIG;
		goto out;
2658 2659
	}

2660 2661
	/* Note that the symbols in the kmodule are not relocated */
	if (!pev->uprobes && !pp->retprobe && !pev->target) {
2662
		reloc_sym = kernel_get_ref_reloc_sym();
2663 2664 2665 2666 2667 2668
		if (!reloc_sym) {
			pr_warning("Relocated base symbol is not found!\n");
			ret = -EINVAL;
			goto out;
		}
	}
2669

2670 2671 2672
	/* Setup result trace-probe-events */
	*tevs = zalloc(sizeof(*tev) * num_matched_functions);
	if (!*tevs) {
2673
		ret = -ENOMEM;
2674
		goto out;
2675
	}
2676

2677
	ret = 0;
2678

2679 2680 2681
	for (j = 0; j < num_matched_functions; j++) {
		sym = syms[j];

2682 2683 2684 2685 2686
		tev = (*tevs) + ret;
		tp = &tev->point;
		if (ret == num_matched_functions) {
			pr_warning("Too many symbols are listed. Skip it.\n");
			break;
2687
		}
2688
		ret++;
2689

2690 2691 2692 2693 2694 2695 2696 2697
		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;
2698 2699 2700

		/* Check the kprobe (not in module) is within .text  */
		if (!pev->uprobes && !pev->target &&
2701 2702 2703 2704
		    kprobe_warn_out_range(sym->name, tp->address)) {
			tp->symbol = NULL;	/* Skip it */
			skipped++;
		} else if (reloc_sym) {
2705 2706 2707 2708 2709 2710
			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;
		}
2711 2712
		tp->realname = strdup_or_goto(sym->name, nomem_out);

2713
		tp->retprobe = pp->retprobe;
2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726
		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;
			}
		}
2727 2728 2729 2730 2731 2732 2733
		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;
2734
		}
2735
		for (i = 0; i < tev->nargs; i++) {
2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746
			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);
2747
		}
2748
		arch__fix_tev_from_maps(pev, tev, map, sym);
2749
	}
2750 2751 2752 2753
	if (ret == skipped) {
		ret = -ENOENT;
		goto err_out;
	}
2754

2755
out:
2756
	put_target_map(map, pev->uprobes);
2757
	free(syms);
2758
	return ret;
2759

2760 2761 2762 2763 2764 2765 2766
nomem_out:
	ret = -ENOMEM;
err_out:
	clear_probe_trace_events(*tevs, num_matched_functions);
	zfree(tevs);
	goto out;
}
2767

2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859
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;
}

2860 2861
bool __weak arch__prefers_symtab(void) { return false; }

2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
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;

	cache = probe_cache__new(pev->target);
	if (!cache)
		return 0;

	entry = probe_cache__find(cache, pev);
	if (!entry) {
		ret = 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;
}

2911
static int convert_to_probe_trace_events(struct perf_probe_event *pev,
2912
					 struct probe_trace_event **tevs)
2913 2914 2915
{
	int ret;

2916 2917 2918 2919 2920 2921 2922
	if (!pev->group) {
		/* 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);
2923 2924 2925 2926
		if (ret != 0) {
			pr_warning("Failed to make a group name.\n");
			return ret;
		}
2927
	}
2928

2929 2930 2931 2932
	ret = try_to_find_absolute_address(pev, tevs);
	if (ret > 0)
		return ret;

2933 2934 2935 2936 2937
	/* At first, we need to lookup cache entry */
	ret = find_probe_trace_events_from_cache(pev, tevs);
	if (ret > 0)
		return ret;	/* Found in probe cache */

2938
	if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
2939
		ret = find_probe_trace_events_from_map(pev, tevs);
2940 2941 2942 2943
		if (ret > 0)
			return ret; /* Found in symbol table */
	}

2944
	/* Convert perf_probe_event with debuginfo */
2945
	ret = try_to_find_probe_trace_events(pev, tevs);
2946 2947 2948
	if (ret != 0)
		return ret;	/* Found in debuginfo or got an error */

2949
	return find_probe_trace_events_from_map(pev, tevs);
2950 2951
}

2952
int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2953
{
2954
	int i, ret;
2955 2956 2957

	/* Loop 1: convert all events */
	for (i = 0; i < npevs; i++) {
2958
		/* Init kprobe blacklist if needed */
2959
		if (!pevs[i].uprobes)
2960
			kprobe_blacklist__init();
2961
		/* Convert with or without debuginfo */
2962
		ret  = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
2963
		if (ret < 0)
2964
			return ret;
2965
		pevs[i].ntevs = ret;
2966
	}
2967 2968
	/* This just release blacklist only if allocated */
	kprobe_blacklist__release();
2969

2970 2971 2972
	return 0;
}

2973
int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2974 2975 2976
{
	int i, ret = 0;

2977
	/* Loop 2: add all events */
2978
	for (i = 0; i < npevs; i++) {
2979 2980
		ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
					       pevs[i].ntevs,
2981
					       probe_conf.force_add);
2982 2983 2984
		if (ret < 0)
			break;
	}
2985 2986 2987
	return ret;
}

2988
void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2989 2990 2991
{
	int i, j;

2992 2993
	/* Loop 3: cleanup and free trace events  */
	for (i = 0; i < npevs; i++) {
2994 2995 2996 2997
		for (j = 0; j < pevs[i].ntevs; j++)
			clear_probe_trace_event(&pevs[i].tevs[j]);
		zfree(&pevs[i].tevs);
		pevs[i].ntevs = 0;
2998
		clear_perf_probe_event(&pevs[i]);
2999
	}
3000 3001 3002 3003 3004 3005
}

int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
{
	int ret;

3006 3007 3008 3009
	ret = init_probe_symbol_maps(pevs->uprobes);
	if (ret < 0)
		return ret;

3010
	ret = convert_perf_probe_events(pevs, npevs);
3011
	if (ret == 0)
3012
		ret = apply_perf_probe_events(pevs, npevs);
3013

3014
	cleanup_perf_probe_events(pevs, npevs);
3015

3016
	exit_probe_symbol_maps();
3017
	return ret;
3018 3019
}

3020
int del_perf_probe_events(struct strfilter *filter)
3021
{
3022 3023 3024 3025 3026 3027
	int ret, ret2, ufd = -1, kfd = -1;
	char *str = strfilter__string(filter);

	if (!str)
		return -EINVAL;

3028
	/* Get current event names */
3029 3030 3031
	ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
	if (ret < 0)
		goto out;
3032

3033
	ret = probe_file__del_events(kfd, filter);
3034
	if (ret < 0 && ret != -ENOENT)
3035 3036
		goto error;

3037
	ret2 = probe_file__del_events(ufd, filter);
3038
	if (ret2 < 0 && ret2 != -ENOENT) {
3039
		ret = ret2;
3040 3041 3042
		goto error;
	}
	ret = 0;
3043 3044

error:
3045
	if (kfd >= 0)
3046
		close(kfd);
3047
	if (ufd >= 0)
3048
		close(ufd);
3049
out:
3050
	free(str);
3051 3052

	return ret;
3053
}
3054

3055 3056
/* TODO: don't use a global variable for filter ... */
static struct strfilter *available_func_filter;
3057

3058
/*
3059 3060
 * If a symbol corresponds to a function with global binding and
 * matches filter return 0. For all others return 1.
3061
 */
3062
static int filter_available_functions(struct map *map __maybe_unused,
3063
				      struct symbol *sym)
3064
{
3065
	if (strfilter__compare(available_func_filter, sym->name))
3066 3067
		return 0;
	return 1;
3068 3069
}

3070 3071
int show_available_funcs(const char *target, struct strfilter *_filter,
					bool user)
3072 3073 3074 3075
{
	struct map *map;
	int ret;

3076
	ret = init_probe_symbol_maps(user);
3077 3078 3079
	if (ret < 0)
		return ret;

3080 3081 3082 3083 3084
	/* Get a symbol map */
	if (user)
		map = dso__new_map(target);
	else
		map = kernel_get_module_map(target);
3085
	if (!map) {
3086
		pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3087 3088
		return -EINVAL;
	}
3089

3090
	/* Load symbols with given filter */
3091
	available_func_filter = _filter;
3092 3093 3094 3095 3096 3097
	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);
3098

3099 3100 3101 3102 3103
	/* Show all (filtered) symbols */
	setup_pager();
	dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
end:
	if (user) {
3104
		map__put(map);
3105
	}
3106
	exit_probe_symbol_maps();
3107

3108
	return ret;
3109 3110
}

3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129
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;
}