probe-event.c 70.5 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);
475
			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 [EVENT=]SRC[:LN|;PTN]
	 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1211 1212
	 *
	 * TODO:Group name support
1213
	 */
1214 1215
	if (!arg)
		return -EINVAL;
1216

1217 1218
	ptr = strpbrk(arg, ";=@+%");
	if (ptr && *ptr == '=') {	/* Event name */
1219 1220
		*ptr = '\0';
		tmp = ptr + 1;
1221 1222 1223 1224
		if (strchr(arg, ':')) {
			semantic_error("Group name is not supported yet.\n");
			return -ENOTSUP;
		}
1225
		if (!is_c_func_name(arg)) {
1226
			semantic_error("%s is bad for event name -it must "
1227 1228 1229
				       "follow C symbol-naming rule.\n", arg);
			return -EINVAL;
		}
1230 1231 1232
		pev->event = strdup(arg);
		if (pev->event == NULL)
			return -ENOMEM;
1233
		pev->group = NULL;
1234 1235 1236
		arg = tmp;
	}

1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
	/*
	 * 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;
	}

1254
	ptr = strpbrk(arg, ";:+@%");
1255 1256 1257 1258 1259
	if (ptr) {
		nc = *ptr;
		*ptr++ = '\0';
	}

1260 1261 1262 1263 1264 1265 1266
	if (arg[0] == '\0')
		tmp = NULL;
	else {
		tmp = strdup(arg);
		if (tmp == NULL)
			return -ENOMEM;
	}
1267

1268
	if (file_spec)
1269
		pp->file = tmp;
1270
	else {
1271
		pp->function = tmp;
1272

1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
		/*
		 * 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;
			}
		}
	}

1291 1292 1293 1294
	/* Parse other options */
	while (ptr) {
		arg = ptr;
		c = nc;
1295
		if (c == ';') {	/* Lazy pattern must be the last part */
1296 1297 1298
			pp->lazy_line = strdup(arg);
			if (pp->lazy_line == NULL)
				return -ENOMEM;
1299 1300 1301
			break;
		}
		ptr = strpbrk(arg, ";:+@%");
1302 1303 1304 1305 1306 1307 1308
		if (ptr) {
			nc = *ptr;
			*ptr++ = '\0';
		}
		switch (c) {
		case ':':	/* Line number */
			pp->line = strtoul(arg, &tmp, 0);
1309
			if (*tmp != '\0') {
1310
				semantic_error("There is non-digit char"
1311 1312 1313
					       " in line number.\n");
				return -EINVAL;
			}
1314 1315 1316
			break;
		case '+':	/* Byte offset from a symbol */
			pp->offset = strtoul(arg, &tmp, 0);
1317
			if (*tmp != '\0') {
1318
				semantic_error("There is non-digit character"
1319 1320 1321
						" in offset.\n");
				return -EINVAL;
			}
1322 1323
			break;
		case '@':	/* File name */
1324 1325 1326 1327
			if (pp->file) {
				semantic_error("SRC@SRC is not allowed.\n");
				return -EINVAL;
			}
1328 1329 1330
			pp->file = strdup(arg);
			if (pp->file == NULL)
				return -ENOMEM;
1331 1332 1333 1334
			break;
		case '%':	/* Probe places */
			if (strcmp(arg, "return") == 0) {
				pp->retprobe = 1;
1335 1336 1337 1338
			} else {	/* Others not supported yet */
				semantic_error("%%%s is not supported.\n", arg);
				return -ENOTSUP;
			}
1339
			break;
1340 1341 1342 1343
		default:	/* Buggy case */
			pr_err("This program has a bug at %s:%d.\n",
				__FILE__, __LINE__);
			return -ENOTSUP;
1344 1345 1346 1347 1348
			break;
		}
	}

	/* Exclusion check */
1349
	if (pp->lazy_line && pp->line) {
M
Masami Hiramatsu 已提交
1350 1351
		semantic_error("Lazy pattern can't be used with"
			       " line number.\n");
1352 1353
		return -EINVAL;
	}
1354

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

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

1365
	if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1366
		semantic_error("File always requires line number or "
M
Masami Hiramatsu 已提交
1367
			       "lazy pattern.\n");
1368 1369
		return -EINVAL;
	}
1370

1371
	if (pp->offset && !pp->function) {
M
Masami Hiramatsu 已提交
1372
		semantic_error("Offset requires an entry function.\n");
1373 1374
		return -EINVAL;
	}
1375

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

1381
	if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1382
		semantic_error("Offset/Line/Lazy pattern can't be used with "
M
Masami Hiramatsu 已提交
1383
			       "return probe.\n");
1384 1385
		return -EINVAL;
	}
1386

1387
	pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1388 1389
		 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
		 pp->lazy_line);
1390
	return 0;
1391 1392
}

1393
/* Parse perf-probe event argument */
1394
static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1395
{
1396
	char *tmp, *goodname;
1397 1398 1399 1400
	struct perf_probe_arg_field **fieldp;

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

1401 1402
	tmp = strchr(str, '=');
	if (tmp) {
1403 1404 1405
		arg->name = strndup(str, tmp - str);
		if (arg->name == NULL)
			return -ENOMEM;
1406
		pr_debug("name:%s ", arg->name);
1407 1408 1409
		str = tmp + 1;
	}

1410 1411 1412
	tmp = strchr(str, ':');
	if (tmp) {	/* Type setting */
		*tmp = '\0';
1413 1414 1415
		arg->type = strdup(tmp + 1);
		if (arg->type == NULL)
			return -ENOMEM;
1416 1417 1418
		pr_debug("type:%s ", arg->type);
	}

1419
	tmp = strpbrk(str, "-.[");
1420 1421
	if (!is_c_varname(str) || !tmp) {
		/* A variable, register, symbol or special value */
1422 1423 1424
		arg->var = strdup(str);
		if (arg->var == NULL)
			return -ENOMEM;
1425
		pr_debug("%s\n", arg->var);
1426
		return 0;
1427 1428
	}

1429
	/* Structure fields or array element */
1430 1431 1432
	arg->var = strndup(str, tmp - str);
	if (arg->var == NULL)
		return -ENOMEM;
1433
	goodname = arg->var;
1434
	pr_debug("%s, ", arg->var);
1435 1436 1437
	fieldp = &arg->field;

	do {
1438 1439 1440
		*fieldp = zalloc(sizeof(struct perf_probe_arg_field));
		if (*fieldp == NULL)
			return -ENOMEM;
1441 1442 1443
		if (*tmp == '[') {	/* Array */
			str = tmp;
			(*fieldp)->index = strtol(str + 1, &tmp, 0);
1444
			(*fieldp)->ref = true;
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
			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, "-.[");
1466
		}
1467
		if (tmp) {
1468 1469 1470
			(*fieldp)->name = strndup(str, tmp - str);
			if ((*fieldp)->name == NULL)
				return -ENOMEM;
1471 1472
			if (*str != '[')
				goodname = (*fieldp)->name;
1473 1474 1475 1476
			pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
			fieldp = &(*fieldp)->next;
		}
	} while (tmp);
1477 1478 1479
	(*fieldp)->name = strdup(str);
	if ((*fieldp)->name == NULL)
		return -ENOMEM;
1480 1481
	if (*str != '[')
		goodname = (*fieldp)->name;
1482
	pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1483

1484
	/* If no name is specified, set the last field name (not array index)*/
1485
	if (!arg->name) {
1486
		arg->name = strdup(goodname);
1487 1488 1489
		if (arg->name == NULL)
			return -ENOMEM;
	}
1490
	return 0;
1491 1492
}

1493
/* Parse perf-probe event command */
1494
int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1495
{
1496
	char **argv;
1497
	int argc, i, ret = 0;
1498

1499
	argv = argv_split(cmd, &argc);
1500 1501 1502 1503 1504 1505 1506 1507 1508
	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;
	}
1509
	/* Parse probe point */
1510 1511 1512
	ret = parse_perf_probe_point(argv[0], pev);
	if (ret < 0)
		goto out;
1513

1514
	/* Copy arguments and ensure return probe has no C argument */
1515
	pev->nargs = argc - 1;
1516 1517 1518 1519 1520
	pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
	if (pev->args == NULL) {
		ret = -ENOMEM;
		goto out;
	}
1521 1522 1523 1524
	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) {
1525
			semantic_error("You can't specify local variable for"
1526 1527 1528
				       " kretprobe.\n");
			ret = -EINVAL;
		}
1529
	}
1530
out:
1531
	argv_free(argv);
1532 1533

	return ret;
1534 1535
}

1536 1537 1538 1539 1540 1541 1542 1543 1544
/* 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++)
1545
		if (is_c_varname(pev->args[i].var))
1546 1547 1548 1549 1550
			return true;

	return false;
}

1551
/* Parse probe_events event into struct probe_point */
1552
int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1553
{
1554
	struct probe_trace_point *tp = &tev->point;
1555 1556
	char pr;
	char *p;
1557
	char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1558 1559 1560
	int ret, i, argc;
	char **argv;

1561
	pr_debug("Parsing probe_events: %s\n", cmd);
1562
	argv = argv_split(cmd, &argc);
1563 1564 1565 1566 1567 1568 1569 1570 1571
	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;
	}
1572 1573

	/* Scan event and group name. */
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583
	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) {
1584 1585 1586 1587
		semantic_error("Failed to parse event name: %s\n", argv[0]);
		ret = -EINVAL;
		goto out;
	}
1588 1589 1590 1591 1592 1593 1594
	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;
	}
1595
	pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1596

1597
	tp->retprobe = (pr == 'r');
1598

1599 1600 1601 1602
	/* Scan module name(if there), function name and offset */
	p = strchr(argv[1], ':');
	if (p) {
		tp->module = strndup(argv[1], p - argv[1]);
1603 1604 1605 1606
		if (!tp->module) {
			ret = -ENOMEM;
			goto out;
		}
1607 1608 1609
		p++;
	} else
		p = argv[1];
1610
	fmt1_str = strtok_r(p, "+", &fmt);
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
	/* 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 {
1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
		/* 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);
1647
	}
1648

1649
	tev->nargs = argc - 2;
1650
	tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1651 1652 1653 1654
	if (tev->args == NULL) {
		ret = -ENOMEM;
		goto out;
	}
1655
	for (i = 0; i < tev->nargs; i++) {
1656 1657
		p = strchr(argv[i + 2], '=');
		if (p)	/* We don't need which register is assigned. */
1658 1659 1660
			*p++ = '\0';
		else
			p = argv[i + 2];
1661
		tev->args[i].name = strdup(argv[i + 2]);
1662
		/* TODO: parse regs and offset */
1663 1664 1665 1666 1667
		tev->args[i].value = strdup(p);
		if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
			ret = -ENOMEM;
			goto out;
		}
1668
	}
1669 1670
	ret = 0;
out:
1671
	free(argv0_str);
1672
	argv_free(argv);
1673
	return ret;
1674 1675
}

1676
/* Compose only probe arg */
1677
char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1678 1679
{
	struct perf_probe_arg_field *field = pa->field;
1680
	struct strbuf buf;
1681 1682 1683 1684 1685
	char *ret = NULL;
	int err;

	if (strbuf_init(&buf, 64) < 0)
		return NULL;
1686

1687
	if (pa->name && pa->var)
1688
		err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1689
	else
1690 1691 1692
		err = strbuf_addstr(&buf, pa->name ?: pa->var);
	if (err)
		goto out;
1693 1694

	while (field) {
1695
		if (field->name[0] == '[')
1696
			err = strbuf_addstr(&buf, field->name);
1697
		else
1698 1699
			err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
					  field->name);
1700
		field = field->next;
1701 1702
		if (err)
			goto out;
1703
	}
1704

1705
	if (pa->type)
1706 1707
		if (strbuf_addf(&buf, ":%s", pa->type) < 0)
			goto out;
1708 1709

	ret = strbuf_detach(&buf, NULL);
1710 1711
out:
	strbuf_release(&buf);
1712
	return ret;
1713 1714
}

1715
/* Compose only probe point (not argument) */
1716
char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1717
{
1718
	struct strbuf buf;
1719 1720 1721 1722 1723
	char *tmp, *ret = NULL;
	int len, err = 0;

	if (strbuf_init(&buf, 64) < 0)
		return NULL;
1724 1725

	if (pp->function) {
1726 1727
		if (strbuf_addstr(&buf, pp->function) < 0)
			goto out;
1728
		if (pp->offset)
1729
			err = strbuf_addf(&buf, "+%lu", pp->offset);
1730
		else if (pp->line)
1731
			err = strbuf_addf(&buf, ":%d", pp->line);
1732
		else if (pp->retprobe)
1733 1734 1735
			err = strbuf_addstr(&buf, "%return");
		if (err)
			goto out;
1736 1737
	}
	if (pp->file) {
1738 1739 1740 1741 1742 1743
		tmp = pp->file;
		len = strlen(tmp);
		if (len > 30) {
			tmp = strchr(pp->file + len - 30, '/');
			tmp = tmp ? tmp + 1 : pp->file + len - 30;
		}
1744 1745 1746
		err = strbuf_addf(&buf, "@%s", tmp);
		if (!err && !pp->function && pp->line)
			err = strbuf_addf(&buf, ":%d", pp->line);
1747
	}
1748 1749 1750 1751 1752
	if (!err)
		ret = strbuf_detach(&buf, NULL);
out:
	strbuf_release(&buf);
	return ret;
1753 1754
}

1755
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1756
{
1757 1758 1759
	struct strbuf buf;
	char *tmp, *ret = NULL;
	int i;
1760

1761
	if (strbuf_init(&buf, 64))
1762
		return NULL;
1763 1764 1765 1766 1767 1768 1769 1770 1771
	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);
1772

1773
	for (i = 0; i < pev->nargs; i++) {
1774 1775 1776 1777
		tmp = synthesize_perf_probe_arg(pev->args + i);
		if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
			goto out;
		free(tmp);
1778 1779
	}

1780 1781 1782 1783
	ret = strbuf_detach(&buf, NULL);
out:
	strbuf_release(&buf);
	return ret;
1784 1785
}

1786
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1787
					    struct strbuf *buf, int depth)
1788
{
1789
	int err;
1790
	if (ref->next) {
1791
		depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1792
							 depth + 1);
1793
		if (depth < 0)
1794
			return depth;
1795
	}
1796 1797
	err = strbuf_addf(buf, "%+ld(", ref->offset);
	return (err < 0) ? err : depth;
1798 1799
}

1800
static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1801
				      struct strbuf *buf)
1802
{
1803
	struct probe_trace_arg_ref *ref = arg->ref;
1804
	int depth = 0, err;
1805 1806 1807

	/* Argument name or separator */
	if (arg->name)
1808
		err = strbuf_addf(buf, " %s=", arg->name);
1809
	else
1810 1811 1812
		err = strbuf_addch(buf, ' ');
	if (err)
		return err;
1813

1814 1815 1816 1817
	/* Special case: @XXX */
	if (arg->value[0] == '@' && arg->ref)
			ref = ref->next;

1818
	/* Dereferencing arguments */
1819
	if (ref) {
1820
		depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1821 1822 1823 1824 1825
		if (depth < 0)
			return depth;
	}

	/* Print argument value */
1826
	if (arg->value[0] == '@' && arg->ref)
1827
		err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
1828
	else
1829
		err = strbuf_addstr(buf, arg->value);
1830 1831

	/* Closing */
1832 1833 1834
	while (!err && depth--)
		err = strbuf_addch(buf, ')');

1835
	/* Print argument type */
1836 1837
	if (!err && arg->type)
		err = strbuf_addf(buf, ":%s", arg->type);
1838

1839
	return err;
1840 1841
}

1842
char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1843
{
1844
	struct probe_trace_point *tp = &tev->point;
1845 1846
	struct strbuf buf;
	char *ret = NULL;
1847
	int i, err;
1848

1849 1850
	/* Uprobes must have tp->module */
	if (tev->uprobes && !tp->module)
1851 1852
		return NULL;

1853 1854 1855 1856 1857 1858
	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;
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
	/*
	 * 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;
	}
1869 1870

	/* Use the tp->address for uprobes */
1871
	if (tev->uprobes)
1872
		err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
1873 1874
	else if (!strncmp(tp->symbol, "0x", 2))
		/* Absolute address. See try_to_find_absolute_address() */
1875 1876
		err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
				  tp->module ? ":" : "", tp->address);
1877
	else
1878 1879 1880 1881
		err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
				tp->module ? ":" : "", tp->symbol, tp->offset);
	if (err)
		goto error;
1882

1883 1884
	for (i = 0; i < tev->nargs; i++)
		if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
1885 1886
			goto error;

1887
	ret = strbuf_detach(&buf, NULL);
1888
error:
1889 1890
	strbuf_release(&buf);
	return ret;
1891
}
1892

1893 1894 1895 1896 1897 1898
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;
1899
	u64 addr = tp->address;
1900 1901 1902 1903 1904 1905 1906 1907
	int ret = -ENOENT;

	if (!is_kprobe) {
		map = dso__new_map(tp->module);
		if (!map)
			goto out;
		sym = map__find_symbol(map, addr, NULL);
	} else {
1908
		if (tp->symbol && !addr) {
1909 1910
			if (kernel_get_symbol_address_by_name(tp->symbol,
						&addr, true, false) < 0)
1911 1912
				goto out;
		}
1913 1914 1915 1916 1917
		if (addr) {
			addr += tp->offset;
			sym = __find_kernel_function(addr, &map);
		}
	}
1918

1919 1920 1921 1922 1923 1924 1925 1926 1927 1928
	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) {
1929
		map__put(map);
1930 1931 1932 1933 1934 1935
	}

	return ret;
}

static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1936 1937
				       struct perf_probe_point *pp,
				       bool is_kprobe)
1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
{
	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;
1954
	} else {
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968
		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;
}

1969
static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1970
			       struct perf_probe_event *pev, bool is_kprobe)
1971
{
1972
	struct strbuf buf = STRBUF_INIT;
1973
	int i, ret;
1974

1975
	/* Convert event/group name */
1976 1977 1978 1979
	pev->event = strdup(tev->event);
	pev->group = strdup(tev->group);
	if (pev->event == NULL || pev->group == NULL)
		return -ENOMEM;
1980

1981
	/* Convert trace_point to probe_point */
1982
	ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
1983 1984
	if (ret < 0)
		return ret;
1985

1986 1987
	/* Convert trace_arg to probe_arg */
	pev->nargs = tev->nargs;
1988 1989 1990
	pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
	if (pev->args == NULL)
		return -ENOMEM;
1991
	for (i = 0; i < tev->nargs && ret >= 0; i++) {
1992
		if (tev->args[i].name)
1993
			pev->args[i].name = strdup(tev->args[i].name);
1994
		else {
1995 1996
			if ((ret = strbuf_init(&buf, 32)) < 0)
				goto error;
1997 1998
			ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
			pev->args[i].name = strbuf_detach(&buf, NULL);
1999
		}
2000 2001 2002
		if (pev->args[i].name == NULL && ret >= 0)
			ret = -ENOMEM;
	}
2003
error:
2004 2005 2006 2007
	if (ret < 0)
		clear_perf_probe_event(pev);

	return ret;
2008 2009 2010 2011
}

void clear_perf_probe_event(struct perf_probe_event *pev)
{
2012
	struct perf_probe_arg_field *field, *next;
2013 2014
	int i;

2015 2016
	free(pev->event);
	free(pev->group);
2017
	free(pev->target);
2018
	clear_perf_probe_point(&pev->point);
2019

2020
	for (i = 0; i < pev->nargs; i++) {
2021 2022 2023
		free(pev->args[i].name);
		free(pev->args[i].var);
		free(pev->args[i].type);
2024 2025 2026
		field = pev->args[i].field;
		while (field) {
			next = field->next;
2027
			zfree(&field->name);
2028 2029 2030 2031
			free(field);
			field = next;
		}
	}
2032
	free(pev->args);
2033 2034 2035
	memset(pev, 0, sizeof(*pev));
}

2036 2037 2038 2039 2040 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
#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;
}

2109
void clear_probe_trace_event(struct probe_trace_event *tev)
2110
{
2111
	struct probe_trace_arg_ref *ref, *next;
2112 2113
	int i;

2114 2115 2116
	free(tev->event);
	free(tev->group);
	free(tev->point.symbol);
2117
	free(tev->point.realname);
2118
	free(tev->point.module);
2119
	for (i = 0; i < tev->nargs; i++) {
2120 2121 2122
		free(tev->args[i].name);
		free(tev->args[i].value);
		free(tev->args[i].type);
2123 2124 2125 2126 2127 2128 2129
		ref = tev->args[i].ref;
		while (ref) {
			next = ref->next;
			free(ref);
			ref = next;
		}
	}
2130
	free(tev->args);
2131
	memset(tev, 0, sizeof(*tev));
2132 2133
}

2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
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;
2157
	const char *__debugfs = debugfs__mountpoint();
2158 2159 2160 2161 2162 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
	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;
}

2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243
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);
}

2244 2245
static int perf_probe_event__sprintf(const char *group, const char *event,
				     struct perf_probe_event *pev,
2246 2247
				     const char *module,
				     struct strbuf *result)
2248
{
2249
	int i, ret;
2250
	char *buf;
2251

2252 2253
	if (asprintf(&buf, "%s:%s", group, event) < 0)
		return -errno;
2254
	ret = strbuf_addf(result, "  %-20s (on ", buf);
2255
	free(buf);
2256 2257
	if (ret)
		return ret;
2258

2259 2260 2261 2262
	/* Synthesize only event probe point */
	buf = synthesize_perf_probe_point(&pev->point);
	if (!buf)
		return -ENOMEM;
2263
	ret = strbuf_addstr(result, buf);
2264
	free(buf);
2265

2266 2267
	if (!ret && module)
		ret = strbuf_addf(result, " in %s", module);
2268

2269 2270 2271
	if (!ret && pev->nargs > 0) {
		ret = strbuf_add(result, " with", 5);
		for (i = 0; !ret && i < pev->nargs; i++) {
2272 2273 2274
			buf = synthesize_perf_probe_arg(&pev->args[i]);
			if (!buf)
				return -ENOMEM;
2275
			ret = strbuf_addf(result, " %s", buf);
2276
			free(buf);
2277
		}
2278
	}
2279 2280
	if (!ret)
		ret = strbuf_addch(result, ')');
2281

2282
	return ret;
2283 2284
}

2285
/* Show an event */
2286 2287 2288
int show_perf_probe_event(const char *group, const char *event,
			  struct perf_probe_event *pev,
			  const char *module, bool use_stdout)
2289 2290 2291 2292
{
	struct strbuf buf = STRBUF_INIT;
	int ret;

2293
	ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304
	if (ret >= 0) {
		if (use_stdout)
			printf("%s\n", buf.buf);
		else
			pr_info("%s\n", buf.buf);
	}
	strbuf_release(&buf);

	return ret;
}

2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321
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)
2322
{
2323
	int ret = 0;
2324
	struct probe_trace_event tev;
2325
	struct perf_probe_event pev;
2326 2327 2328
	struct strlist *rawlist;
	struct str_node *ent;

2329 2330
	memset(&tev, 0, sizeof(tev));
	memset(&pev, 0, sizeof(pev));
2331

2332
	rawlist = probe_file__get_rawlist(fd);
2333
	if (!rawlist)
2334
		return -ENOMEM;
2335

2336
	strlist__for_each_entry(ent, rawlist) {
2337
		ret = parse_probe_trace_command(ent->s, &tev);
2338
		if (ret >= 0) {
2339 2340
			if (!filter_probe_trace_event(&tev, filter))
				goto next;
2341 2342
			ret = convert_to_perf_probe_event(&tev, &pev,
								is_kprobe);
2343 2344
			if (ret < 0)
				goto next;
2345 2346
			ret = show_perf_probe_event(pev.group, pev.event,
						    &pev, tev.point.module,
2347
						    true);
2348
		}
2349
next:
2350
		clear_perf_probe_event(&pev);
2351
		clear_probe_trace_event(&tev);
2352 2353
		if (ret < 0)
			break;
2354 2355
	}
	strlist__delete(rawlist);
2356 2357
	/* Cleanup cached debuginfo if needed */
	debuginfo_cache__exit();
2358 2359

	return ret;
2360 2361
}

2362
/* List up current perf-probe events */
2363
int show_perf_probe_events(struct strfilter *filter)
2364
{
2365
	int kp_fd, up_fd, ret;
2366 2367 2368

	setup_pager();

2369 2370 2371
	if (probe_conf.cache)
		return probe_cache__show_all_caches(filter);

2372
	ret = init_probe_symbol_maps(false);
2373 2374 2375
	if (ret < 0)
		return ret;

2376 2377 2378
	ret = probe_file__open_both(&kp_fd, &up_fd, 0);
	if (ret < 0)
		return ret;
2379

2380 2381 2382
	if (kp_fd >= 0)
		ret = __show_perf_probe_events(kp_fd, true, filter);
	if (up_fd >= 0 && ret >= 0)
2383
		ret = __show_perf_probe_events(up_fd, false, filter);
2384 2385 2386
	if (kp_fd > 0)
		close(kp_fd);
	if (up_fd > 0)
2387
		close(up_fd);
2388
	exit_probe_symbol_maps();
2389

2390
	return ret;
2391 2392
}

2393 2394
static int get_new_event_name(char *buf, size_t len, const char *base,
			      struct strlist *namelist, bool allow_suffix)
2395 2396
{
	int i, ret;
2397
	char *p, *nbase;
2398

2399 2400
	if (*base == '.')
		base++;
2401 2402 2403 2404 2405 2406 2407 2408
	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';
2409

2410 2411
	/* Try no suffix number */
	ret = e_snprintf(buf, len, "%s", nbase);
2412
	if (ret < 0) {
2413
		pr_debug("snprintf() failed: %d\n", ret);
2414
		goto out;
2415
	}
2416
	if (!strlist__has_entry(namelist, buf))
2417
		goto out;
2418

2419
	if (!allow_suffix) {
2420 2421 2422 2423 2424
		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);
2425 2426
		ret = -EEXIST;
		goto out;
2427 2428
	}

2429 2430
	/* Try to add suffix */
	for (i = 1; i < MAX_EVENT_INDEX; i++) {
2431
		ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2432
		if (ret < 0) {
2433
			pr_debug("snprintf() failed: %d\n", ret);
2434
			goto out;
2435
		}
2436 2437 2438
		if (!strlist__has_entry(namelist, buf))
			break;
	}
2439 2440 2441 2442 2443
	if (i == MAX_EVENT_INDEX) {
		pr_warning("Too many events are on the same function.\n");
		ret = -ERANGE;
	}

2444 2445
out:
	free(nbase);
2446
	return ret;
2447 2448
}

2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469
/* 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);
}

2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
/* 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;

2480
	/* If probe_event or trace_event already have the name, reuse it */
2481 2482
	if (pev->event)
		event = pev->event;
2483 2484 2485 2486
	else if (tev->event)
		event = tev->event;
	else {
		/* Or generate new one from probe point */
2487 2488 2489
		if (pev->point.function &&
			(strncmp(pev->point.function, "0x", 2) != 0) &&
			!strisglob(pev->point.function))
2490 2491 2492
			event = pev->point.function;
		else
			event = tev->point.realname;
2493
	}
2494 2495
	if (pev->group)
		group = pev->group;
2496 2497
	else if (tev->group)
		group = tev->group;
2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518
	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;
}

2519 2520
static int __add_probe_trace_events(struct perf_probe_event *pev,
				     struct probe_trace_event *tevs,
2521
				     int ntevs, bool allow_suffix)
2522
{
2523
	int i, fd, ret;
2524
	struct probe_trace_event *tev = NULL;
2525
	struct probe_cache *cache = NULL;
2526
	struct strlist *namelist;
2527

2528 2529
	fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
	if (fd < 0)
2530
		return fd;
2531

2532
	/* Get current event names */
2533
	namelist = probe_file__get_namelist(fd);
2534 2535
	if (!namelist) {
		pr_debug("Failed to get current event list.\n");
2536 2537
		ret = -ENOMEM;
		goto close_out;
2538
	}
2539

2540
	ret = 0;
2541
	for (i = 0; i < ntevs; i++) {
2542
		tev = &tevs[i];
2543
		/* Skip if the symbol is out of .text or blacklisted */
2544
		if (!tev->point.symbol && !pev->uprobes)
2545
			continue;
2546

2547 2548 2549
		/* Set new name for tev (and update namelist) */
		ret = probe_trace_event__set_name(tev, pev, namelist,
						  allow_suffix);
2550 2551
		if (ret < 0)
			break;
2552

2553
		ret = probe_file__add_event(fd, tev);
2554 2555
		if (ret < 0)
			break;
2556 2557 2558 2559 2560 2561 2562 2563

		/*
		 * 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;
2564
	}
2565 2566
	if (ret == -EINVAL && pev->uprobes)
		warn_uprobe_event_compat(tev);
2567 2568 2569 2570 2571 2572 2573 2574
	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);
	}
2575

2576
	strlist__delete(namelist);
2577
close_out:
2578
	close(fd);
2579
	return ret;
2580
}
2581

2582 2583
static int find_probe_functions(struct map *map, char *name,
				struct symbol **syms)
2584
{
2585
	int found = 0;
2586
	struct symbol *sym;
2587
	struct rb_node *tmp;
2588

2589 2590 2591
	if (map__load(map, NULL) < 0)
		return 0;

2592
	map__for_each_symbol(map, sym, tmp) {
2593
		if (strglobmatch(sym->name, name)) {
2594
			found++;
2595 2596 2597
			if (syms && found < probe_conf.max_probes)
				syms[found - 1] = sym;
		}
2598
	}
2599 2600

	return found;
2601 2602
}

2603 2604
void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
				struct probe_trace_event *tev __maybe_unused,
2605 2606
				struct map *map __maybe_unused,
				struct symbol *sym __maybe_unused) { }
2607

2608 2609 2610 2611 2612
/*
 * 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,
2613
					    struct probe_trace_event **tevs)
2614
{
2615 2616
	struct map *map = NULL;
	struct ref_reloc_sym *reloc_sym = NULL;
2617
	struct symbol *sym;
2618
	struct symbol **syms = NULL;
2619
	struct probe_trace_event *tev;
2620 2621
	struct perf_probe_point *pp = &pev->point;
	struct probe_trace_point *tp;
2622
	int num_matched_functions;
2623
	int ret, i, j, skipped = 0;
2624
	char *mod_name;
2625

2626
	map = get_target_map(pev->target, pev->uprobes);
2627 2628 2629
	if (!map) {
		ret = -EINVAL;
		goto out;
2630 2631
	}

2632 2633 2634 2635 2636 2637
	syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
	if (!syms) {
		ret = -ENOMEM;
		goto out;
	}

2638 2639 2640 2641
	/*
	 * Load matched symbols: Since the different local symbols may have
	 * same name but different addresses, this lists all the symbols.
	 */
2642
	num_matched_functions = find_probe_functions(map, pp->function, syms);
2643
	if (num_matched_functions == 0) {
2644
		pr_err("Failed to find symbol %s in %s\n", pp->function,
2645
			pev->target ? : "kernel");
2646 2647
		ret = -ENOENT;
		goto out;
2648
	} else if (num_matched_functions > probe_conf.max_probes) {
2649
		pr_err("Too many functions matched in %s\n",
2650
			pev->target ? : "kernel");
2651 2652
		ret = -E2BIG;
		goto out;
2653 2654
	}

2655 2656
	/* Note that the symbols in the kmodule are not relocated */
	if (!pev->uprobes && !pp->retprobe && !pev->target) {
2657
		reloc_sym = kernel_get_ref_reloc_sym();
2658 2659 2660 2661 2662 2663
		if (!reloc_sym) {
			pr_warning("Relocated base symbol is not found!\n");
			ret = -EINVAL;
			goto out;
		}
	}
2664

2665 2666 2667
	/* Setup result trace-probe-events */
	*tevs = zalloc(sizeof(*tev) * num_matched_functions);
	if (!*tevs) {
2668
		ret = -ENOMEM;
2669
		goto out;
2670
	}
2671

2672
	ret = 0;
2673

2674 2675 2676
	for (j = 0; j < num_matched_functions; j++) {
		sym = syms[j];

2677 2678 2679 2680 2681
		tev = (*tevs) + ret;
		tp = &tev->point;
		if (ret == num_matched_functions) {
			pr_warning("Too many symbols are listed. Skip it.\n");
			break;
2682
		}
2683
		ret++;
2684

2685 2686 2687 2688 2689 2690 2691 2692
		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;
2693 2694 2695

		/* Check the kprobe (not in module) is within .text  */
		if (!pev->uprobes && !pev->target &&
2696 2697 2698 2699
		    kprobe_warn_out_range(sym->name, tp->address)) {
			tp->symbol = NULL;	/* Skip it */
			skipped++;
		} else if (reloc_sym) {
2700 2701 2702 2703 2704 2705
			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;
		}
2706 2707
		tp->realname = strdup_or_goto(sym->name, nomem_out);

2708
		tp->retprobe = pp->retprobe;
2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721
		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;
			}
		}
2722 2723 2724 2725 2726 2727 2728
		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;
2729
		}
2730
		for (i = 0; i < tev->nargs; i++) {
2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
			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);
2742
		}
2743
		arch__fix_tev_from_maps(pev, tev, map, sym);
2744
	}
2745 2746 2747 2748
	if (ret == skipped) {
		ret = -ENOENT;
		goto err_out;
	}
2749

2750
out:
2751
	put_target_map(map, pev->uprobes);
2752
	free(syms);
2753
	return ret;
2754

2755 2756 2757 2758 2759 2760 2761
nomem_out:
	ret = -ENOMEM;
err_out:
	clear_probe_trace_events(*tevs, num_matched_functions);
	zfree(tevs);
	goto out;
}
2762

2763 2764 2765 2766 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
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;
}

2855 2856
bool __weak arch__prefers_symtab(void) { return false; }

2857 2858 2859 2860 2861 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
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;
}

2906
static int convert_to_probe_trace_events(struct perf_probe_event *pev,
2907
					 struct probe_trace_event **tevs)
2908 2909 2910
{
	int ret;

2911 2912 2913 2914 2915 2916 2917
	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);
2918 2919 2920 2921
		if (ret != 0) {
			pr_warning("Failed to make a group name.\n");
			return ret;
		}
2922
	}
2923

2924 2925 2926 2927
	ret = try_to_find_absolute_address(pev, tevs);
	if (ret > 0)
		return ret;

2928 2929 2930 2931 2932
	/* 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 */

2933
	if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
2934
		ret = find_probe_trace_events_from_map(pev, tevs);
2935 2936 2937 2938
		if (ret > 0)
			return ret; /* Found in symbol table */
	}

2939
	/* Convert perf_probe_event with debuginfo */
2940
	ret = try_to_find_probe_trace_events(pev, tevs);
2941 2942 2943
	if (ret != 0)
		return ret;	/* Found in debuginfo or got an error */

2944
	return find_probe_trace_events_from_map(pev, tevs);
2945 2946
}

2947
int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2948
{
2949
	int i, ret;
2950 2951 2952

	/* Loop 1: convert all events */
	for (i = 0; i < npevs; i++) {
2953
		/* Init kprobe blacklist if needed */
2954
		if (!pevs[i].uprobes)
2955
			kprobe_blacklist__init();
2956
		/* Convert with or without debuginfo */
2957
		ret  = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
2958
		if (ret < 0)
2959
			return ret;
2960
		pevs[i].ntevs = ret;
2961
	}
2962 2963
	/* This just release blacklist only if allocated */
	kprobe_blacklist__release();
2964

2965 2966 2967
	return 0;
}

2968
int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2969 2970 2971
{
	int i, ret = 0;

2972
	/* Loop 2: add all events */
2973
	for (i = 0; i < npevs; i++) {
2974 2975
		ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
					       pevs[i].ntevs,
2976
					       probe_conf.force_add);
2977 2978 2979
		if (ret < 0)
			break;
	}
2980 2981 2982
	return ret;
}

2983
void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2984 2985 2986
{
	int i, j;

2987 2988
	/* Loop 3: cleanup and free trace events  */
	for (i = 0; i < npevs; i++) {
2989 2990 2991 2992
		for (j = 0; j < pevs[i].ntevs; j++)
			clear_probe_trace_event(&pevs[i].tevs[j]);
		zfree(&pevs[i].tevs);
		pevs[i].ntevs = 0;
2993
		clear_perf_probe_event(&pevs[i]);
2994
	}
2995 2996 2997 2998 2999 3000
}

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

3001 3002 3003 3004
	ret = init_probe_symbol_maps(pevs->uprobes);
	if (ret < 0)
		return ret;

3005
	ret = convert_perf_probe_events(pevs, npevs);
3006
	if (ret == 0)
3007
		ret = apply_perf_probe_events(pevs, npevs);
3008

3009
	cleanup_perf_probe_events(pevs, npevs);
3010

3011
	exit_probe_symbol_maps();
3012
	return ret;
3013 3014
}

3015
int del_perf_probe_events(struct strfilter *filter)
3016
{
3017 3018 3019 3020 3021 3022
	int ret, ret2, ufd = -1, kfd = -1;
	char *str = strfilter__string(filter);

	if (!str)
		return -EINVAL;

3023
	/* Get current event names */
3024 3025 3026
	ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
	if (ret < 0)
		goto out;
3027

3028
	ret = probe_file__del_events(kfd, filter);
3029
	if (ret < 0 && ret != -ENOENT)
3030 3031
		goto error;

3032
	ret2 = probe_file__del_events(ufd, filter);
3033
	if (ret2 < 0 && ret2 != -ENOENT) {
3034
		ret = ret2;
3035 3036 3037
		goto error;
	}
	ret = 0;
3038 3039

error:
3040
	if (kfd >= 0)
3041
		close(kfd);
3042
	if (ufd >= 0)
3043
		close(ufd);
3044
out:
3045
	free(str);
3046 3047

	return ret;
3048
}
3049

3050 3051
/* TODO: don't use a global variable for filter ... */
static struct strfilter *available_func_filter;
3052

3053
/*
3054 3055
 * If a symbol corresponds to a function with global binding and
 * matches filter return 0. For all others return 1.
3056
 */
3057
static int filter_available_functions(struct map *map __maybe_unused,
3058
				      struct symbol *sym)
3059
{
3060
	if (strfilter__compare(available_func_filter, sym->name))
3061 3062
		return 0;
	return 1;
3063 3064
}

3065 3066
int show_available_funcs(const char *target, struct strfilter *_filter,
					bool user)
3067 3068 3069 3070
{
	struct map *map;
	int ret;

3071
	ret = init_probe_symbol_maps(user);
3072 3073 3074
	if (ret < 0)
		return ret;

3075 3076 3077 3078 3079
	/* Get a symbol map */
	if (user)
		map = dso__new_map(target);
	else
		map = kernel_get_module_map(target);
3080
	if (!map) {
3081
		pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3082 3083
		return -EINVAL;
	}
3084

3085
	/* Load symbols with given filter */
3086
	available_func_filter = _filter;
3087 3088 3089 3090 3091 3092
	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);
3093

3094 3095 3096 3097 3098
	/* Show all (filtered) symbols */
	setup_pager();
	dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
end:
	if (user) {
3099
		map__put(map);
3100
	}
3101
	exit_probe_symbol_maps();
3102

3103
	return ret;
3104 3105
}

3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124
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;
}