![Masami Hiramatsu](/assets/img/avatar_default.png)
Cleanup debuginfo related code to eliminate fragile code which pointed by Ingo (Thanks!). 1) Invert logic of NO_DWARF_SUPPORT to DWARF_SUPPORT. 2) For removing assymetric/local variable ifdefs, introduce more helper functions. 3) Change options order to reduce the number of ifdefs. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1269274229-20442-2-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
1248 lines
29 KiB
C
1248 lines
29 KiB
C
/*
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* probe-event.c : perf-probe definition to kprobe_events format converter
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#define _GNU_SOURCE
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <limits.h>
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#undef _GNU_SOURCE
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#include "util.h"
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#include "event.h"
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#include "string.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"
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#include "thread.h"
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#include "trace-event.h" /* For __unused */
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#include "parse-events.h" /* For debugfs_path */
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#include "probe-event.h"
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#include "probe-finder.h"
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#define MAX_CMDLEN 256
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#define MAX_PROBE_ARGS 128
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#define PERFPROBE_GROUP "probe"
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bool probe_event_dry_run; /* Dry run flag */
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#define semantic_error(msg ...) die("Semantic error :" msg)
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/* If there is no space to write, returns -E2BIG. */
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static int e_snprintf(char *str, size_t size, const char *format, ...)
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__attribute__((format(printf, 3, 4)));
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static int e_snprintf(char *str, size_t size, const char *format, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, format);
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ret = vsnprintf(str, size, format, ap);
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va_end(ap);
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if (ret >= (int)size)
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ret = -E2BIG;
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return ret;
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}
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static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
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static struct map_groups kmap_groups;
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static struct map *kmaps[MAP__NR_TYPES];
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/* Initialize symbol maps and path of vmlinux */
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static void init_vmlinux(void)
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{
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symbol_conf.sort_by_name = true;
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if (symbol_conf.vmlinux_name == NULL)
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symbol_conf.try_vmlinux_path = true;
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else
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pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
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if (symbol__init() < 0)
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die("Failed to init symbol map.");
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map_groups__init(&kmap_groups);
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if (map_groups__create_kernel_maps(&kmap_groups, kmaps) < 0)
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die("Failed to create kernel maps.");
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}
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#ifdef DWARF_SUPPORT
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static int open_vmlinux(void)
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{
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if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) {
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pr_debug("Failed to load kernel map.\n");
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return -EINVAL;
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}
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pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name);
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return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
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}
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static void convert_to_perf_probe_point(struct kprobe_trace_point *tp,
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struct perf_probe_point *pp)
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{
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struct symbol *sym;
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int fd, ret = 0;
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sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
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tp->symbol, NULL);
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if (sym) {
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fd = open_vmlinux();
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ret = find_perf_probe_point(fd, sym->start + tp->offset, pp);
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close(fd);
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}
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if (ret <= 0) {
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pp->function = xstrdup(tp->symbol);
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pp->offset = tp->offset;
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}
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pp->retprobe = tp->retprobe;
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}
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/* Try to find perf_probe_event with debuginfo */
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static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
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struct kprobe_trace_event **tevs)
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{
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bool need_dwarf = perf_probe_event_need_dwarf(pev);
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int fd, ntevs;
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fd = open_vmlinux();
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if (fd < 0) {
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if (need_dwarf)
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die("Could not open debuginfo file.");
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pr_debug("Could not open vmlinux. Try to use symbols.\n");
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return 0;
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}
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/* Searching trace events corresponding to probe event */
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ntevs = find_kprobe_trace_events(fd, pev, tevs);
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close(fd);
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if (ntevs > 0) /* Succeeded to find trace events */
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return ntevs;
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if (ntevs == 0) /* No error but failed to find probe point. */
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die("Probe point '%s' not found. - probe not added.",
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synthesize_perf_probe_point(&pev->point));
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/* Error path */
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if (need_dwarf) {
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if (ntevs == -ENOENT)
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pr_warning("No dwarf info found in the vmlinux - "
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"please rebuild with CONFIG_DEBUG_INFO=y.\n");
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die("Could not analyze debuginfo.");
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}
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pr_debug("An error occurred in debuginfo analysis."
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" Try to use symbols.\n");
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return 0;
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}
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#define LINEBUF_SIZE 256
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#define NR_ADDITIONAL_LINES 2
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static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
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{
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char buf[LINEBUF_SIZE];
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const char *color = PERF_COLOR_BLUE;
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if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
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goto error;
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if (!skip) {
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if (show_num)
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fprintf(stdout, "%7u %s", l, buf);
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else
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color_fprintf(stdout, color, " %s", buf);
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}
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while (strlen(buf) == LINEBUF_SIZE - 1 &&
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buf[LINEBUF_SIZE - 2] != '\n') {
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if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
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goto error;
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if (!skip) {
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if (show_num)
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fprintf(stdout, "%s", buf);
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else
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color_fprintf(stdout, color, "%s", buf);
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}
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}
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return;
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error:
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if (feof(fp))
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die("Source file is shorter than expected.");
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else
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die("File read error: %s", strerror(errno));
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}
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/*
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* Show line-range always requires debuginfo to find source file and
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* line number.
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*/
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void show_line_range(struct line_range *lr)
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{
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unsigned int l = 1;
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struct line_node *ln;
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FILE *fp;
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int fd, ret;
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/* Search a line range */
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init_vmlinux();
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fd = open_vmlinux();
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if (fd < 0)
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die("Could not open debuginfo file.");
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ret = find_line_range(fd, lr);
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if (ret <= 0)
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die("Source line is not found.\n");
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close(fd);
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setup_pager();
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if (lr->function)
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fprintf(stdout, "<%s:%d>\n", lr->function,
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lr->start - lr->offset);
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else
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fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
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fp = fopen(lr->path, "r");
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if (fp == NULL)
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die("Failed to open %s: %s", lr->path, strerror(errno));
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/* Skip to starting line number */
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while (l < lr->start)
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show_one_line(fp, l++, true, false);
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list_for_each_entry(ln, &lr->line_list, list) {
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while (ln->line > l)
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show_one_line(fp, (l++) - lr->offset, false, false);
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show_one_line(fp, (l++) - lr->offset, false, true);
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}
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if (lr->end == INT_MAX)
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lr->end = l + NR_ADDITIONAL_LINES;
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while (l < lr->end && !feof(fp))
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show_one_line(fp, (l++) - lr->offset, false, false);
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fclose(fp);
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}
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#else /* !DWARF_SUPPORT */
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static void convert_to_perf_probe_point(struct kprobe_trace_point *tp,
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struct perf_probe_point *pp)
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{
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pp->function = xstrdup(tp->symbol);
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pp->offset = tp->offset;
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pp->retprobe = tp->retprobe;
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}
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static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
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struct kprobe_trace_event **tevs __unused)
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{
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if (perf_probe_event_need_dwarf(pev))
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die("Debuginfo-analysis is not supported");
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return 0;
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}
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void show_line_range(struct line_range *lr __unused)
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{
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die("Debuginfo-analysis is not supported");
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}
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#endif
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void parse_line_range_desc(const char *arg, struct line_range *lr)
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{
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const char *ptr;
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char *tmp;
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/*
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* <Syntax>
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* SRC:SLN[+NUM|-ELN]
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* FUNC[:SLN[+NUM|-ELN]]
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*/
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ptr = strchr(arg, ':');
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if (ptr) {
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lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0);
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if (*tmp == '+')
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lr->end = lr->start + (unsigned int)strtoul(tmp + 1,
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&tmp, 0);
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else if (*tmp == '-')
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lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0);
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else
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lr->end = 0;
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pr_debug("Line range is %u to %u\n", lr->start, lr->end);
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if (lr->end && lr->start > lr->end)
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semantic_error("Start line must be smaller"
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" than end line.");
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if (*tmp != '\0')
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semantic_error("Tailing with invalid character '%d'.",
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*tmp);
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tmp = xstrndup(arg, (ptr - arg));
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} else
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tmp = xstrdup(arg);
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if (strchr(tmp, '.'))
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lr->file = tmp;
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else
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lr->function = tmp;
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}
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/* Check the name is good for event/group */
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static bool check_event_name(const char *name)
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{
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if (!isalpha(*name) && *name != '_')
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return false;
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while (*++name != '\0') {
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if (!isalpha(*name) && !isdigit(*name) && *name != '_')
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return false;
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}
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return true;
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}
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/* Parse probepoint definition. */
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static void parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
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{
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struct perf_probe_point *pp = &pev->point;
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char *ptr, *tmp;
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char c, nc = 0;
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/*
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* <Syntax>
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* perf probe [EVENT=]SRC[:LN|;PTN]
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* perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
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*
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* TODO:Group name support
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*/
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ptr = strpbrk(arg, ";=@+%");
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if (ptr && *ptr == '=') { /* Event name */
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*ptr = '\0';
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tmp = ptr + 1;
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ptr = strchr(arg, ':');
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if (ptr) /* Group name is not supported yet. */
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semantic_error("Group name is not supported yet.");
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if (!check_event_name(arg))
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semantic_error("%s is bad for event name -it must "
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"follow C symbol-naming rule.", arg);
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pev->event = xstrdup(arg);
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pev->group = NULL;
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arg = tmp;
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}
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ptr = strpbrk(arg, ";:+@%");
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if (ptr) {
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nc = *ptr;
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*ptr++ = '\0';
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}
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/* Check arg is function or file and copy it */
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if (strchr(arg, '.')) /* File */
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pp->file = xstrdup(arg);
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else /* Function */
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pp->function = xstrdup(arg);
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/* Parse other options */
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while (ptr) {
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arg = ptr;
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c = nc;
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if (c == ';') { /* Lazy pattern must be the last part */
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pp->lazy_line = xstrdup(arg);
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break;
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}
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ptr = strpbrk(arg, ";:+@%");
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if (ptr) {
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nc = *ptr;
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*ptr++ = '\0';
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}
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switch (c) {
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case ':': /* Line number */
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pp->line = strtoul(arg, &tmp, 0);
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if (*tmp != '\0')
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semantic_error("There is non-digit char"
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" in line number.");
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break;
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case '+': /* Byte offset from a symbol */
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pp->offset = strtoul(arg, &tmp, 0);
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if (*tmp != '\0')
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semantic_error("There is non-digit character"
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" in offset.");
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break;
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case '@': /* File name */
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if (pp->file)
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semantic_error("SRC@SRC is not allowed.");
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pp->file = xstrdup(arg);
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break;
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case '%': /* Probe places */
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if (strcmp(arg, "return") == 0) {
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pp->retprobe = 1;
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} else /* Others not supported yet */
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semantic_error("%%%s is not supported.", arg);
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break;
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default:
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DIE_IF("Program has a bug.");
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break;
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}
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}
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/* Exclusion check */
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if (pp->lazy_line && pp->line)
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semantic_error("Lazy pattern can't be used with line number.");
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if (pp->lazy_line && pp->offset)
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semantic_error("Lazy pattern can't be used with offset.");
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if (pp->line && pp->offset)
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semantic_error("Offset can't be used with line number.");
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if (!pp->line && !pp->lazy_line && pp->file && !pp->function)
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semantic_error("File always requires line number or "
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"lazy pattern.");
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if (pp->offset && !pp->function)
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semantic_error("Offset requires an entry function.");
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if (pp->retprobe && !pp->function)
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semantic_error("Return probe requires an entry function.");
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if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe)
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semantic_error("Offset/Line/Lazy pattern can't be used with "
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"return probe.");
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pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
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pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
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pp->lazy_line);
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}
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/* Parse perf-probe event argument */
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static void parse_perf_probe_arg(const char *str, struct perf_probe_arg *arg)
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{
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const char *tmp;
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struct perf_probe_arg_field **fieldp;
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pr_debug("parsing arg: %s into ", str);
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tmp = strpbrk(str, "-.");
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if (!is_c_varname(str) || !tmp) {
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/* A variable, register, symbol or special value */
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arg->name = xstrdup(str);
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pr_debug("%s\n", arg->name);
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return;
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}
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/* Structure fields */
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arg->name = xstrndup(str, tmp - str);
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pr_debug("%s, ", arg->name);
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fieldp = &arg->field;
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do {
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*fieldp = xzalloc(sizeof(struct perf_probe_arg_field));
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if (*tmp == '.') {
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str = tmp + 1;
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(*fieldp)->ref = false;
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} else if (tmp[1] == '>') {
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str = tmp + 2;
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(*fieldp)->ref = true;
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} else
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semantic_error("Argument parse error: %s", str);
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tmp = strpbrk(str, "-.");
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if (tmp) {
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(*fieldp)->name = xstrndup(str, tmp - str);
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pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
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fieldp = &(*fieldp)->next;
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}
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} while (tmp);
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(*fieldp)->name = xstrdup(str);
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pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
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}
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/* Parse perf-probe event command */
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void parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
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{
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char **argv;
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int argc, i;
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argv = argv_split(cmd, &argc);
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if (!argv)
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die("argv_split failed.");
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if (argc > MAX_PROBE_ARGS + 1)
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semantic_error("Too many arguments");
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|
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/* Parse probe point */
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parse_perf_probe_point(argv[0], pev);
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|
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/* Copy arguments and ensure return probe has no C argument */
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pev->nargs = argc - 1;
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pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
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for (i = 0; i < pev->nargs; i++) {
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parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
|
|
if (is_c_varname(pev->args[i].name) && pev->point.retprobe)
|
|
semantic_error("You can't specify local variable for"
|
|
" kretprobe");
|
|
}
|
|
|
|
argv_free(argv);
|
|
}
|
|
|
|
/* Return true if this perf_probe_event requires debuginfo */
|
|
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
|
|
{
|
|
int i;
|
|
|
|
if (pev->point.file || pev->point.line || pev->point.lazy_line)
|
|
return true;
|
|
|
|
for (i = 0; i < pev->nargs; i++)
|
|
if (is_c_varname(pev->args[i].name))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Parse kprobe_events event into struct probe_point */
|
|
void parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev)
|
|
{
|
|
struct kprobe_trace_point *tp = &tev->point;
|
|
char pr;
|
|
char *p;
|
|
int ret, i, argc;
|
|
char **argv;
|
|
|
|
pr_debug("Parsing kprobe_events: %s\n", cmd);
|
|
argv = argv_split(cmd, &argc);
|
|
if (!argv)
|
|
die("argv_split failed.");
|
|
if (argc < 2)
|
|
semantic_error("Too less arguments.");
|
|
|
|
/* Scan event and group name. */
|
|
ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
|
|
&pr, (float *)(void *)&tev->group,
|
|
(float *)(void *)&tev->event);
|
|
if (ret != 3)
|
|
semantic_error("Failed to parse event name: %s", argv[0]);
|
|
pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
|
|
|
|
tp->retprobe = (pr == 'r');
|
|
|
|
/* Scan function name and offset */
|
|
ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
|
|
&tp->offset);
|
|
if (ret == 1)
|
|
tp->offset = 0;
|
|
|
|
tev->nargs = argc - 2;
|
|
tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
p = strchr(argv[i + 2], '=');
|
|
if (p) /* We don't need which register is assigned. */
|
|
*p++ = '\0';
|
|
else
|
|
p = argv[i + 2];
|
|
tev->args[i].name = xstrdup(argv[i + 2]);
|
|
/* TODO: parse regs and offset */
|
|
tev->args[i].value = xstrdup(p);
|
|
}
|
|
|
|
argv_free(argv);
|
|
}
|
|
|
|
/* Compose only probe arg */
|
|
int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
|
|
{
|
|
struct perf_probe_arg_field *field = pa->field;
|
|
int ret;
|
|
char *tmp = buf;
|
|
|
|
ret = e_snprintf(tmp, len, "%s", pa->name);
|
|
if (ret <= 0)
|
|
goto error;
|
|
tmp += ret;
|
|
len -= ret;
|
|
|
|
while (field) {
|
|
ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".",
|
|
field->name);
|
|
if (ret <= 0)
|
|
goto error;
|
|
tmp += ret;
|
|
len -= ret;
|
|
field = field->next;
|
|
}
|
|
return tmp - buf;
|
|
error:
|
|
die("Failed to synthesize perf probe argument: %s", strerror(-ret));
|
|
}
|
|
|
|
/* Compose only probe point (not argument) */
|
|
static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
|
|
{
|
|
char *buf, *tmp;
|
|
char offs[32] = "", line[32] = "", file[32] = "";
|
|
int ret, len;
|
|
|
|
buf = xzalloc(MAX_CMDLEN);
|
|
if (pp->offset) {
|
|
ret = e_snprintf(offs, 32, "+%lu", pp->offset);
|
|
if (ret <= 0)
|
|
goto error;
|
|
}
|
|
if (pp->line) {
|
|
ret = e_snprintf(line, 32, ":%d", pp->line);
|
|
if (ret <= 0)
|
|
goto error;
|
|
}
|
|
if (pp->file) {
|
|
len = strlen(pp->file) - 32;
|
|
if (len < 0)
|
|
len = 0;
|
|
tmp = strchr(pp->file + len, '/');
|
|
if (!tmp)
|
|
tmp = pp->file + len - 1;
|
|
ret = e_snprintf(file, 32, "@%s", tmp + 1);
|
|
if (ret <= 0)
|
|
goto error;
|
|
}
|
|
|
|
if (pp->function)
|
|
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
|
|
offs, pp->retprobe ? "%return" : "", line,
|
|
file);
|
|
else
|
|
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
|
|
if (ret <= 0)
|
|
goto error;
|
|
|
|
return buf;
|
|
error:
|
|
die("Failed to synthesize perf probe point: %s", strerror(-ret));
|
|
}
|
|
|
|
#if 0
|
|
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
|
|
{
|
|
char *buf;
|
|
int i, len, ret;
|
|
|
|
buf = synthesize_perf_probe_point(&pev->point);
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
len = strlen(buf);
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
|
|
pev->args[i].name);
|
|
if (ret <= 0) {
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
len += ret;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref,
|
|
char **buf, size_t *buflen,
|
|
int depth)
|
|
{
|
|
int ret;
|
|
if (ref->next) {
|
|
depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf,
|
|
buflen, depth + 1);
|
|
if (depth < 0)
|
|
goto out;
|
|
}
|
|
|
|
ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
|
|
if (ret < 0)
|
|
depth = ret;
|
|
else {
|
|
*buf += ret;
|
|
*buflen -= ret;
|
|
}
|
|
out:
|
|
return depth;
|
|
|
|
}
|
|
|
|
static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
|
|
char *buf, size_t buflen)
|
|
{
|
|
int ret, depth = 0;
|
|
char *tmp = buf;
|
|
|
|
/* Argument name or separator */
|
|
if (arg->name)
|
|
ret = e_snprintf(buf, buflen, " %s=", arg->name);
|
|
else
|
|
ret = e_snprintf(buf, buflen, " ");
|
|
if (ret < 0)
|
|
return ret;
|
|
buf += ret;
|
|
buflen -= ret;
|
|
|
|
/* Dereferencing arguments */
|
|
if (arg->ref) {
|
|
depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf,
|
|
&buflen, 1);
|
|
if (depth < 0)
|
|
return depth;
|
|
}
|
|
|
|
/* Print argument value */
|
|
ret = e_snprintf(buf, buflen, "%s", arg->value);
|
|
if (ret < 0)
|
|
return ret;
|
|
buf += ret;
|
|
buflen -= ret;
|
|
|
|
/* Closing */
|
|
while (depth--) {
|
|
ret = e_snprintf(buf, buflen, ")");
|
|
if (ret < 0)
|
|
return ret;
|
|
buf += ret;
|
|
buflen -= ret;
|
|
}
|
|
|
|
return buf - tmp;
|
|
}
|
|
|
|
char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev)
|
|
{
|
|
struct kprobe_trace_point *tp = &tev->point;
|
|
char *buf;
|
|
int i, len, ret;
|
|
|
|
buf = xzalloc(MAX_CMDLEN);
|
|
len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
|
|
tp->retprobe ? 'r' : 'p',
|
|
tev->group, tev->event,
|
|
tp->symbol, tp->offset);
|
|
if (len <= 0)
|
|
goto error;
|
|
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len,
|
|
MAX_CMDLEN - len);
|
|
if (ret <= 0)
|
|
goto error;
|
|
len += ret;
|
|
}
|
|
|
|
return buf;
|
|
error:
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
void convert_to_perf_probe_event(struct kprobe_trace_event *tev,
|
|
struct perf_probe_event *pev)
|
|
{
|
|
char buf[64];
|
|
int i;
|
|
|
|
/* Convert event/group name */
|
|
pev->event = xstrdup(tev->event);
|
|
pev->group = xstrdup(tev->group);
|
|
|
|
/* Convert trace_point to probe_point */
|
|
convert_to_perf_probe_point(&tev->point, &pev->point);
|
|
|
|
/* Convert trace_arg to probe_arg */
|
|
pev->nargs = tev->nargs;
|
|
pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
|
|
for (i = 0; i < tev->nargs; i++)
|
|
if (tev->args[i].name)
|
|
pev->args[i].name = xstrdup(tev->args[i].name);
|
|
else {
|
|
synthesize_kprobe_trace_arg(&tev->args[i], buf, 64);
|
|
pev->args[i].name = xstrdup(buf);
|
|
}
|
|
}
|
|
|
|
void clear_perf_probe_event(struct perf_probe_event *pev)
|
|
{
|
|
struct perf_probe_point *pp = &pev->point;
|
|
struct perf_probe_arg_field *field, *next;
|
|
int i;
|
|
|
|
if (pev->event)
|
|
free(pev->event);
|
|
if (pev->group)
|
|
free(pev->group);
|
|
if (pp->file)
|
|
free(pp->file);
|
|
if (pp->function)
|
|
free(pp->function);
|
|
if (pp->lazy_line)
|
|
free(pp->lazy_line);
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
if (pev->args[i].name)
|
|
free(pev->args[i].name);
|
|
field = pev->args[i].field;
|
|
while (field) {
|
|
next = field->next;
|
|
if (field->name)
|
|
free(field->name);
|
|
free(field);
|
|
field = next;
|
|
}
|
|
}
|
|
if (pev->args)
|
|
free(pev->args);
|
|
memset(pev, 0, sizeof(*pev));
|
|
}
|
|
|
|
void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
|
|
{
|
|
struct kprobe_trace_arg_ref *ref, *next;
|
|
int i;
|
|
|
|
if (tev->event)
|
|
free(tev->event);
|
|
if (tev->group)
|
|
free(tev->group);
|
|
if (tev->point.symbol)
|
|
free(tev->point.symbol);
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
if (tev->args[i].name)
|
|
free(tev->args[i].name);
|
|
if (tev->args[i].value)
|
|
free(tev->args[i].value);
|
|
ref = tev->args[i].ref;
|
|
while (ref) {
|
|
next = ref->next;
|
|
free(ref);
|
|
ref = next;
|
|
}
|
|
}
|
|
if (tev->args)
|
|
free(tev->args);
|
|
memset(tev, 0, sizeof(*tev));
|
|
}
|
|
|
|
static int open_kprobe_events(bool readwrite)
|
|
{
|
|
char buf[PATH_MAX];
|
|
int ret;
|
|
|
|
ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path);
|
|
if (ret < 0)
|
|
die("Failed to make kprobe_events path.");
|
|
|
|
if (readwrite && !probe_event_dry_run)
|
|
ret = open(buf, O_RDWR, O_APPEND);
|
|
else
|
|
ret = open(buf, O_RDONLY, 0);
|
|
|
|
if (ret < 0) {
|
|
if (errno == ENOENT)
|
|
die("kprobe_events file does not exist -"
|
|
" please rebuild with CONFIG_KPROBE_EVENT.");
|
|
else
|
|
die("Could not open kprobe_events file: %s",
|
|
strerror(errno));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Get raw string list of current kprobe_events */
|
|
static struct strlist *get_kprobe_trace_command_rawlist(int fd)
|
|
{
|
|
int ret, idx;
|
|
FILE *fp;
|
|
char buf[MAX_CMDLEN];
|
|
char *p;
|
|
struct strlist *sl;
|
|
|
|
sl = strlist__new(true, NULL);
|
|
|
|
fp = fdopen(dup(fd), "r");
|
|
while (!feof(fp)) {
|
|
p = fgets(buf, MAX_CMDLEN, fp);
|
|
if (!p)
|
|
break;
|
|
|
|
idx = strlen(p) - 1;
|
|
if (p[idx] == '\n')
|
|
p[idx] = '\0';
|
|
ret = strlist__add(sl, buf);
|
|
if (ret < 0)
|
|
die("strlist__add failed: %s", strerror(-ret));
|
|
}
|
|
fclose(fp);
|
|
|
|
return sl;
|
|
}
|
|
|
|
/* Show an event */
|
|
static void show_perf_probe_event(struct perf_probe_event *pev)
|
|
{
|
|
int i, ret;
|
|
char buf[128];
|
|
char *place;
|
|
|
|
/* Synthesize only event probe point */
|
|
place = synthesize_perf_probe_point(&pev->point);
|
|
|
|
ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
|
|
if (ret < 0)
|
|
die("Failed to copy event: %s", strerror(-ret));
|
|
printf(" %-20s (on %s", buf, place);
|
|
|
|
if (pev->nargs > 0) {
|
|
printf(" with");
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
synthesize_perf_probe_arg(&pev->args[i], buf, 128);
|
|
printf(" %s", buf);
|
|
}
|
|
}
|
|
printf(")\n");
|
|
free(place);
|
|
}
|
|
|
|
/* List up current perf-probe events */
|
|
void show_perf_probe_events(void)
|
|
{
|
|
int fd;
|
|
struct kprobe_trace_event tev;
|
|
struct perf_probe_event pev;
|
|
struct strlist *rawlist;
|
|
struct str_node *ent;
|
|
|
|
setup_pager();
|
|
init_vmlinux();
|
|
|
|
memset(&tev, 0, sizeof(tev));
|
|
memset(&pev, 0, sizeof(pev));
|
|
|
|
fd = open_kprobe_events(false);
|
|
rawlist = get_kprobe_trace_command_rawlist(fd);
|
|
close(fd);
|
|
|
|
strlist__for_each(ent, rawlist) {
|
|
parse_kprobe_trace_command(ent->s, &tev);
|
|
convert_to_perf_probe_event(&tev, &pev);
|
|
/* Show an event */
|
|
show_perf_probe_event(&pev);
|
|
clear_perf_probe_event(&pev);
|
|
clear_kprobe_trace_event(&tev);
|
|
}
|
|
|
|
strlist__delete(rawlist);
|
|
}
|
|
|
|
/* Get current perf-probe event names */
|
|
static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
|
|
{
|
|
char buf[128];
|
|
struct strlist *sl, *rawlist;
|
|
struct str_node *ent;
|
|
struct kprobe_trace_event tev;
|
|
|
|
memset(&tev, 0, sizeof(tev));
|
|
|
|
rawlist = get_kprobe_trace_command_rawlist(fd);
|
|
sl = strlist__new(true, NULL);
|
|
strlist__for_each(ent, rawlist) {
|
|
parse_kprobe_trace_command(ent->s, &tev);
|
|
if (include_group) {
|
|
if (e_snprintf(buf, 128, "%s:%s", tev.group,
|
|
tev.event) < 0)
|
|
die("Failed to copy group:event name.");
|
|
strlist__add(sl, buf);
|
|
} else
|
|
strlist__add(sl, tev.event);
|
|
clear_kprobe_trace_event(&tev);
|
|
}
|
|
|
|
strlist__delete(rawlist);
|
|
|
|
return sl;
|
|
}
|
|
|
|
static void write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
|
|
{
|
|
int ret;
|
|
char *buf = synthesize_kprobe_trace_command(tev);
|
|
|
|
pr_debug("Writing event: %s\n", buf);
|
|
if (!probe_event_dry_run) {
|
|
ret = write(fd, buf, strlen(buf));
|
|
if (ret <= 0)
|
|
die("Failed to write event: %s", strerror(errno));
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
static void get_new_event_name(char *buf, size_t len, const char *base,
|
|
struct strlist *namelist, bool allow_suffix)
|
|
{
|
|
int i, ret;
|
|
|
|
/* Try no suffix */
|
|
ret = e_snprintf(buf, len, "%s", base);
|
|
if (ret < 0)
|
|
die("snprintf() failed: %s", strerror(-ret));
|
|
if (!strlist__has_entry(namelist, buf))
|
|
return;
|
|
|
|
if (!allow_suffix) {
|
|
pr_warning("Error: event \"%s\" already exists. "
|
|
"(Use -f to force duplicates.)\n", base);
|
|
die("Can't add new event.");
|
|
}
|
|
|
|
/* Try to add suffix */
|
|
for (i = 1; i < MAX_EVENT_INDEX; i++) {
|
|
ret = e_snprintf(buf, len, "%s_%d", base, i);
|
|
if (ret < 0)
|
|
die("snprintf() failed: %s", strerror(-ret));
|
|
if (!strlist__has_entry(namelist, buf))
|
|
break;
|
|
}
|
|
if (i == MAX_EVENT_INDEX)
|
|
die("Too many events are on the same function.");
|
|
}
|
|
|
|
static void __add_kprobe_trace_events(struct perf_probe_event *pev,
|
|
struct kprobe_trace_event *tevs,
|
|
int ntevs, bool allow_suffix)
|
|
{
|
|
int i, fd;
|
|
struct kprobe_trace_event *tev = NULL;
|
|
char buf[64];
|
|
const char *event, *group;
|
|
struct strlist *namelist;
|
|
|
|
fd = open_kprobe_events(true);
|
|
/* Get current event names */
|
|
namelist = get_kprobe_trace_event_names(fd, false);
|
|
|
|
printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
|
|
for (i = 0; i < ntevs; i++) {
|
|
tev = &tevs[i];
|
|
if (pev->event)
|
|
event = pev->event;
|
|
else
|
|
if (pev->point.function)
|
|
event = pev->point.function;
|
|
else
|
|
event = tev->point.symbol;
|
|
if (pev->group)
|
|
group = pev->group;
|
|
else
|
|
group = PERFPROBE_GROUP;
|
|
|
|
/* Get an unused new event name */
|
|
get_new_event_name(buf, 64, event, namelist, allow_suffix);
|
|
event = buf;
|
|
|
|
tev->event = xstrdup(event);
|
|
tev->group = xstrdup(group);
|
|
write_kprobe_trace_event(fd, tev);
|
|
/* Add added event name to namelist */
|
|
strlist__add(namelist, event);
|
|
|
|
/* Trick here - save current event/group */
|
|
event = pev->event;
|
|
group = pev->group;
|
|
pev->event = tev->event;
|
|
pev->group = tev->group;
|
|
show_perf_probe_event(pev);
|
|
/* Trick here - restore current event/group */
|
|
pev->event = (char *)event;
|
|
pev->group = (char *)group;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
/* Show how to use the event. */
|
|
printf("\nYou can now use it on all perf tools, such as:\n\n");
|
|
printf("\tperf record -e %s:%s -a sleep 1\n\n", tev->group, tev->event);
|
|
|
|
strlist__delete(namelist);
|
|
close(fd);
|
|
}
|
|
|
|
static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
|
|
struct kprobe_trace_event **tevs)
|
|
{
|
|
struct symbol *sym;
|
|
int ntevs = 0, i;
|
|
struct kprobe_trace_event *tev;
|
|
|
|
/* Convert perf_probe_event with debuginfo */
|
|
ntevs = try_to_find_kprobe_trace_events(pev, tevs);
|
|
if (ntevs > 0)
|
|
return ntevs;
|
|
|
|
/* Allocate trace event buffer */
|
|
ntevs = 1;
|
|
tev = *tevs = xzalloc(sizeof(struct kprobe_trace_event));
|
|
|
|
/* Copy parameters */
|
|
tev->point.symbol = xstrdup(pev->point.function);
|
|
tev->point.offset = pev->point.offset;
|
|
tev->nargs = pev->nargs;
|
|
if (tev->nargs) {
|
|
tev->args = xzalloc(sizeof(struct kprobe_trace_arg)
|
|
* tev->nargs);
|
|
for (i = 0; i < tev->nargs; i++)
|
|
tev->args[i].value = xstrdup(pev->args[i].name);
|
|
}
|
|
|
|
/* Currently just checking function name from symbol map */
|
|
sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
|
|
tev->point.symbol, NULL);
|
|
if (!sym)
|
|
die("Kernel symbol \'%s\' not found - probe not added.",
|
|
tev->point.symbol);
|
|
|
|
return ntevs;
|
|
}
|
|
|
|
struct __event_package {
|
|
struct perf_probe_event *pev;
|
|
struct kprobe_trace_event *tevs;
|
|
int ntevs;
|
|
};
|
|
|
|
void add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
|
|
bool force_add)
|
|
{
|
|
int i;
|
|
struct __event_package *pkgs;
|
|
|
|
pkgs = xzalloc(sizeof(struct __event_package) * npevs);
|
|
|
|
/* Init vmlinux path */
|
|
init_vmlinux();
|
|
|
|
/* Loop 1: convert all events */
|
|
for (i = 0; i < npevs; i++) {
|
|
pkgs[i].pev = &pevs[i];
|
|
/* Convert with or without debuginfo */
|
|
pkgs[i].ntevs = convert_to_kprobe_trace_events(pkgs[i].pev,
|
|
&pkgs[i].tevs);
|
|
}
|
|
|
|
/* Loop 2: add all events */
|
|
for (i = 0; i < npevs; i++)
|
|
__add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs,
|
|
pkgs[i].ntevs, force_add);
|
|
/* TODO: cleanup all trace events? */
|
|
}
|
|
|
|
static void __del_trace_kprobe_event(int fd, struct str_node *ent)
|
|
{
|
|
char *p;
|
|
char buf[128];
|
|
int ret;
|
|
|
|
/* Convert from perf-probe event to trace-kprobe event */
|
|
if (e_snprintf(buf, 128, "-:%s", ent->s) < 0)
|
|
die("Failed to copy event.");
|
|
p = strchr(buf + 2, ':');
|
|
if (!p)
|
|
die("Internal error: %s should have ':' but not.", ent->s);
|
|
*p = '/';
|
|
|
|
pr_debug("Writing event: %s\n", buf);
|
|
ret = write(fd, buf, strlen(buf));
|
|
if (ret <= 0)
|
|
die("Failed to write event: %s", strerror(errno));
|
|
printf("Remove event: %s\n", ent->s);
|
|
}
|
|
|
|
static void del_trace_kprobe_event(int fd, const char *group,
|
|
const char *event, struct strlist *namelist)
|
|
{
|
|
char buf[128];
|
|
struct str_node *ent, *n;
|
|
int found = 0;
|
|
|
|
if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
|
|
die("Failed to copy event.");
|
|
|
|
if (strpbrk(buf, "*?")) { /* Glob-exp */
|
|
strlist__for_each_safe(ent, n, namelist)
|
|
if (strglobmatch(ent->s, buf)) {
|
|
found++;
|
|
__del_trace_kprobe_event(fd, ent);
|
|
strlist__remove(namelist, ent);
|
|
}
|
|
} else {
|
|
ent = strlist__find(namelist, buf);
|
|
if (ent) {
|
|
found++;
|
|
__del_trace_kprobe_event(fd, ent);
|
|
strlist__remove(namelist, ent);
|
|
}
|
|
}
|
|
if (found == 0)
|
|
pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf);
|
|
}
|
|
|
|
void del_perf_probe_events(struct strlist *dellist)
|
|
{
|
|
int fd;
|
|
const char *group, *event;
|
|
char *p, *str;
|
|
struct str_node *ent;
|
|
struct strlist *namelist;
|
|
|
|
fd = open_kprobe_events(true);
|
|
/* Get current event names */
|
|
namelist = get_kprobe_trace_event_names(fd, true);
|
|
|
|
strlist__for_each(ent, dellist) {
|
|
str = xstrdup(ent->s);
|
|
pr_debug("Parsing: %s\n", str);
|
|
p = strchr(str, ':');
|
|
if (p) {
|
|
group = str;
|
|
*p = '\0';
|
|
event = p + 1;
|
|
} else {
|
|
group = "*";
|
|
event = str;
|
|
}
|
|
pr_debug("Group: %s, Event: %s\n", group, event);
|
|
del_trace_kprobe_event(fd, group, event, namelist);
|
|
free(str);
|
|
}
|
|
strlist__delete(namelist);
|
|
close(fd);
|
|
}
|
|
|