perf: Add perf probe subcommand, a kprobe-event setup helper
Add perf probe subcommand that implements a kprobe-event setup helper
to the perf command.
This allows user to define kprobe events using C expressions (C line
numbers, C function names, and C local variables).
Usage
-----
perf probe [<options>] -P 'PROBEDEF' [-P 'PROBEDEF' ...]
-k, --vmlinux <file> vmlinux/module pathname
-P, --probe <p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]>
probe point definition, where
p: kprobe probe
r: kretprobe probe
GRP: Group name (optional)
NAME: Event name
FUNC: Function name
OFFS: Offset from function entry (in byte)
SRC: Source code path
LINE: Line number
ARG: Probe argument (local variable name or
kprobe-tracer argument format is supported.)
Changes in v4:
- Add _GNU_SOURCE macro for strndup().
Changes in v3:
- Remove -r option because perf always be used for online kernel.
- Check malloc/calloc results.
Changes in v2:
- Check synthesized string length.
- Rename perf kprobe to perf probe.
- Use spaces for separator and update usage comment.
- Check error paths in parse_probepoint().
- Check optimized-out variables.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Frank Ch. Eigler <fche@redhat.com>
LKML-Reference: <20091008211737.29299.14784.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Masami Hiramatsu
Frederic Weisbecker
parent
e93f4d8539
commit
4ea42b1814
6 changed files with 1130 additions and 0 deletions
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@ -419,6 +419,16 @@ ifneq ($(shell sh -c "(echo '\#include <libelf.h>'; echo 'int main(void) { Elf *
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msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel);
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endif
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ifneq ($(shell sh -c "(echo '\#include <libdwarf/dwarf.h>'; echo '\#include <libdwarf/libdwarf.h>'; echo 'int main(void) { Dwarf_Debug dbg; Dwarf_Error err; dwarf_init(0, DW_DLC_READ, 0, 0, &dbg, &err); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -ldwarf -lelf -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y)
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msg := $(warning No libdwarf.h found, disables probe subcommand. Please install libdwarf-dev/libdwarf-devel);
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else
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EXTLIBS += -lelf -ldwarf
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LIB_H += util/probe-finder.h
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LIB_OBJS += util/probe-finder.o
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BUILTIN_OBJS += builtin-probe.o
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BASIC_CFLAGS += -DSUPPORT_DWARF
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endif
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ifdef NO_DEMANGLE
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BASIC_CFLAGS += -DNO_DEMANGLE
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else
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358
tools/perf/builtin-probe.c
Normal file
358
tools/perf/builtin-probe.c
Normal file
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@ -0,0 +1,358 @@
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/*
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* builtin-probe.c
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*
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* Builtin probe command: Set up probe events by C expression
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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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#undef _GNU_SOURCE
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#include "perf.h"
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#include "builtin.h"
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#include "util/util.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h" /* For debugfs_path */
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#include "util/probe-finder.h"
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/* Default vmlinux search paths */
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#define NR_SEARCH_PATH 3
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const char *default_search_path[NR_SEARCH_PATH] = {
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"/lib/modules/%s/build/vmlinux", /* Custom build kernel */
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"/usr/lib/debug/lib/modules/%s/vmlinux", /* Red Hat debuginfo */
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"/boot/vmlinux-debug-%s", /* Ubuntu */
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};
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#define MAX_PATH_LEN 256
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#define MAX_PROBES 128
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/* Session management structure */
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static struct {
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char *vmlinux;
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char *release;
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int nr_probe;
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struct probe_point probes[MAX_PROBES];
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char *events[MAX_PROBES];
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} session;
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static void semantic_error(const char *msg)
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{
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fprintf(stderr, "Semantic error: %s\n", msg);
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exit(1);
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}
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static void perror_exit(const char *msg)
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{
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perror(msg);
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exit(1);
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}
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#define MAX_PROBE_ARGS 128
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static int parse_probepoint(const struct option *opt __used,
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const char *str, int unset __used)
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{
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char *argv[MAX_PROBE_ARGS + 2]; /* Event + probe + args */
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int argc, i;
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char *arg, *ptr;
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struct probe_point *pp = &session.probes[session.nr_probe];
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char **event = &session.events[session.nr_probe];
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int retp = 0;
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if (!str) /* The end of probe points */
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return 0;
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debug("Probe-define(%d): %s\n", session.nr_probe, str);
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if (++session.nr_probe == MAX_PROBES)
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semantic_error("Too many probes");
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/* Separate arguments, similar to argv_split */
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argc = 0;
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do {
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/* Skip separators */
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while (isspace(*str))
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str++;
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/* Add an argument */
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if (*str != '\0') {
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const char *s = str;
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/* Skip the argument */
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while (!isspace(*str) && *str != '\0')
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str++;
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/* Duplicate the argument */
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argv[argc] = strndup(s, str - s);
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if (argv[argc] == NULL)
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perror_exit("strndup");
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if (++argc == MAX_PROBE_ARGS)
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semantic_error("Too many arguments");
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debug("argv[%d]=%s\n", argc, argv[argc - 1]);
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}
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} while (*str != '\0');
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if (argc < 2)
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semantic_error("Need event-name and probe-point at least.");
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/* Parse the event name */
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if (argv[0][0] == 'r')
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retp = 1;
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else if (argv[0][0] != 'p')
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semantic_error("You must specify 'p'(kprobe) or"
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" 'r'(kretprobe) first.");
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/* TODO: check event name */
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*event = argv[0];
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/* Parse probe point */
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arg = argv[1];
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if (arg[0] == '@') {
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/* Source Line */
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arg++;
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ptr = strchr(arg, ':');
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if (!ptr || !isdigit(ptr[1]))
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semantic_error("Line number is required.");
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*ptr++ = '\0';
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if (strlen(arg) == 0)
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semantic_error("No file name.");
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pp->file = strdup(arg);
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pp->line = atoi(ptr);
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if (!pp->file || !pp->line)
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semantic_error("Failed to parse line.");
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debug("file:%s line:%d\n", pp->file, pp->line);
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} else {
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/* Function name */
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ptr = strchr(arg, '+');
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if (ptr) {
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if (!isdigit(ptr[1]))
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semantic_error("Offset is required.");
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*ptr++ = '\0';
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pp->offset = atoi(ptr);
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} else
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ptr = arg;
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ptr = strchr(ptr, '@');
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if (ptr) {
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*ptr++ = '\0';
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pp->file = strdup(ptr);
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}
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pp->function = strdup(arg);
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debug("symbol:%s file:%s offset:%d\n",
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pp->function, pp->file, pp->offset);
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}
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free(argv[1]);
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/* Copy arguments */
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pp->nr_args = argc - 2;
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if (pp->nr_args > 0) {
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pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
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if (!pp->args)
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perror_exit("malloc");
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memcpy(pp->args, &argv[2], sizeof(char *) * pp->nr_args);
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}
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/* Ensure return probe has no C argument */
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if (retp)
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for (i = 0; i < pp->nr_args; i++)
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if (is_c_varname(pp->args[i]))
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semantic_error("You can't specify local"
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" variable for kretprobe");
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debug("%d arguments\n", pp->nr_args);
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return 0;
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}
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static int open_default_vmlinux(void)
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{
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struct utsname uts;
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char fname[MAX_PATH_LEN];
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int fd, ret, i;
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ret = uname(&uts);
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if (ret) {
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debug("uname() failed.\n");
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return -errno;
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}
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session.release = uts.release;
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for (i = 0; i < NR_SEARCH_PATH; i++) {
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ret = snprintf(fname, MAX_PATH_LEN,
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default_search_path[i], session.release);
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if (ret >= MAX_PATH_LEN || ret < 0) {
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debug("Filename(%d,%s) is too long.\n", i, uts.release);
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errno = E2BIG;
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return -E2BIG;
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}
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debug("try to open %s\n", fname);
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fd = open(fname, O_RDONLY);
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if (fd >= 0)
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break;
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}
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return fd;
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}
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static const char * const probe_usage[] = {
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"perf probe [<options>] -P 'PROBEDEF' [-P 'PROBEDEF' ...]",
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NULL
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};
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static const struct option options[] = {
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OPT_STRING('k', "vmlinux", &session.vmlinux, "file",
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"vmlinux/module pathname"),
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OPT_CALLBACK('P', "probe", NULL,
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"p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]",
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"probe point definition, where\n"
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"\t\tp:\tkprobe probe\n"
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"\t\tr:\tkretprobe probe\n"
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"\t\tGRP:\tGroup name (optional)\n"
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"\t\tNAME:\tEvent name\n"
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"\t\tFUNC:\tFunction name\n"
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"\t\tOFFS:\tOffset from function entry (in byte)\n"
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"\t\tSRC:\tSource code path\n"
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"\t\tLINE:\tLine number\n"
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"\t\tARG:\tProbe argument (local variable name or\n"
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"\t\t\tkprobe-tracer argument format is supported.)\n",
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parse_probepoint),
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OPT_END()
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};
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static int write_new_event(int fd, const char *buf)
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{
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int ret;
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printf("Adding new event: %s\n", buf);
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ret = write(fd, buf, strlen(buf));
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if (ret <= 0)
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perror("Error: Failed to create event");
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return ret;
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}
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#define MAX_CMDLEN 256
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static int synthesize_probepoint(struct probe_point *pp)
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{
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char *buf;
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int i, len, ret;
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pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
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if (!buf)
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perror_exit("calloc");
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ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
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if (ret <= 0 || ret >= MAX_CMDLEN)
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goto error;
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len = ret;
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for (i = 0; i < pp->nr_args; i++) {
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ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
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pp->args[i]);
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if (ret <= 0 || ret >= MAX_CMDLEN - len)
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goto error;
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len += ret;
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}
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pp->found = 1;
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return pp->found;
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error:
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free(pp->probes[0]);
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if (ret > 0)
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ret = -E2BIG;
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return ret;
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}
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int cmd_probe(int argc, const char **argv, const char *prefix __used)
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{
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int i, j, fd, ret, need_dwarf = 0;
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struct probe_point *pp;
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char buf[MAX_CMDLEN];
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argc = parse_options(argc, argv, options, probe_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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if (argc || session.nr_probe == 0)
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usage_with_options(probe_usage, options);
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/* Synthesize return probes */
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for (j = 0; j < session.nr_probe; j++) {
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if (session.events[j][0] != 'r') {
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need_dwarf = 1;
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continue;
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}
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ret = synthesize_probepoint(&session.probes[j]);
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if (ret == -E2BIG)
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semantic_error("probe point is too long.");
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else if (ret < 0) {
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perror("snprintf");
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return -1;
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}
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}
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if (!need_dwarf)
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goto setup_probes;
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if (session.vmlinux)
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fd = open(session.vmlinux, O_RDONLY);
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else
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fd = open_default_vmlinux();
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if (fd < 0) {
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perror("vmlinux/module file open");
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return -1;
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}
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/* Searching probe points */
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for (j = 0; j < session.nr_probe; j++) {
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pp = &session.probes[j];
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if (pp->found)
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continue;
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lseek(fd, SEEK_SET, 0);
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ret = find_probepoint(fd, pp);
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if (ret <= 0) {
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fprintf(stderr, "Error: No probe point found.\n");
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return -1;
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}
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debug("probe event %s found\n", session.events[j]);
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}
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close(fd);
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setup_probes:
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/* Settng up probe points */
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snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
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fd = open(buf, O_WRONLY, O_APPEND);
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if (fd < 0) {
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perror("kprobe_events open");
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return -1;
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}
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for (j = 0; j < session.nr_probe; j++) {
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pp = &session.probes[j];
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if (pp->found == 1) {
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snprintf(buf, MAX_CMDLEN, "%s %s\n",
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session.events[j], pp->probes[0]);
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write_new_event(fd, buf);
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} else
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for (i = 0; i < pp->found; i++) {
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snprintf(buf, MAX_CMDLEN, "%s%d %s\n",
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session.events[j], i, pp->probes[i]);
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write_new_event(fd, buf);
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}
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}
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close(fd);
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return 0;
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}
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@ -25,5 +25,6 @@ extern int cmd_timechart(int argc, const char **argv, const char *prefix);
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extern int cmd_top(int argc, const char **argv, const char *prefix);
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extern int cmd_trace(int argc, const char **argv, const char *prefix);
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extern int cmd_version(int argc, const char **argv, const char *prefix);
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extern int cmd_probe(int argc, const char **argv, const char *prefix);
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#endif
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|
|
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@ -295,6 +295,9 @@ static void handle_internal_command(int argc, const char **argv)
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{ "version", cmd_version, 0 },
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{ "trace", cmd_trace, 0 },
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{ "sched", cmd_sched, 0 },
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#ifdef SUPPORT_DWARF
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{ "probe", cmd_probe, 0 },
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#endif
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};
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unsigned int i;
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static const char ext[] = STRIP_EXTENSION;
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|
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690
tools/perf/util/probe-finder.c
Normal file
690
tools/perf/util/probe-finder.c
Normal file
|
|
@ -0,0 +1,690 @@
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/*
|
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* probe-finder.c : C expression to kprobe event converter
|
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*
|
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
|
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*
|
||||
* 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.
|
||||
*
|
||||
*/
|
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|
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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>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <unistd.h>
|
||||
#include <getopt.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <stdarg.h>
|
||||
#include <ctype.h>
|
||||
#include "probe-finder.h"
|
||||
|
||||
|
||||
/* Dwarf_Die Linkage to parent Die */
|
||||
struct die_link {
|
||||
struct die_link *parent; /* Parent die */
|
||||
Dwarf_Die die; /* Current die */
|
||||
};
|
||||
|
||||
static Dwarf_Debug __dw_debug;
|
||||
static Dwarf_Error __dw_error;
|
||||
|
||||
static void msg_exit(int ret, const char *fmt, ...)
|
||||
{
|
||||
va_list ap;
|
||||
|
||||
va_start(ap, fmt);
|
||||
fprintf(stderr, "Error: ");
|
||||
vfprintf(stderr, fmt, ap);
|
||||
va_end(ap);
|
||||
|
||||
fprintf(stderr, "\n");
|
||||
exit(ret);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Generic dwarf analysis helpers
|
||||
*/
|
||||
|
||||
#define X86_32_MAX_REGS 8
|
||||
const char *x86_32_regs_table[X86_32_MAX_REGS] = {
|
||||
"%ax",
|
||||
"%cx",
|
||||
"%dx",
|
||||
"%bx",
|
||||
"$stack", /* Stack address instead of %sp */
|
||||
"%bp",
|
||||
"%si",
|
||||
"%di",
|
||||
};
|
||||
|
||||
#define X86_64_MAX_REGS 16
|
||||
const char *x86_64_regs_table[X86_64_MAX_REGS] = {
|
||||
"%ax",
|
||||
"%dx",
|
||||
"%cx",
|
||||
"%bx",
|
||||
"%si",
|
||||
"%di",
|
||||
"%bp",
|
||||
"%sp",
|
||||
"%r8",
|
||||
"%r9",
|
||||
"%r10",
|
||||
"%r11",
|
||||
"%r12",
|
||||
"%r13",
|
||||
"%r14",
|
||||
"%r15",
|
||||
};
|
||||
|
||||
/* TODO: switching by dwarf address size */
|
||||
#ifdef __x86_64__
|
||||
#define ARCH_MAX_REGS X86_64_MAX_REGS
|
||||
#define arch_regs_table x86_64_regs_table
|
||||
#else
|
||||
#define ARCH_MAX_REGS X86_32_MAX_REGS
|
||||
#define arch_regs_table x86_32_regs_table
|
||||
#endif
|
||||
|
||||
/* Return architecture dependent register string (for kprobe-tracer) */
|
||||
static const char *get_arch_regstr(unsigned int n)
|
||||
{
|
||||
return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Compare the tail of two strings.
|
||||
* Return 0 if whole of either string is same as another's tail part.
|
||||
*/
|
||||
static int strtailcmp(const char *s1, const char *s2)
|
||||
{
|
||||
int i1 = strlen(s1);
|
||||
int i2 = strlen(s2);
|
||||
while (--i1 > 0 && --i2 > 0) {
|
||||
if (s1[i1] != s2[i2])
|
||||
return s1[i1] - s2[i2];
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Find the fileno of the target file. */
|
||||
static Dwarf_Unsigned die_get_fileno(Dwarf_Die cu_die, const char *fname)
|
||||
{
|
||||
Dwarf_Signed cnt, i;
|
||||
Dwarf_Unsigned found = 0;
|
||||
char **srcs;
|
||||
int ret;
|
||||
|
||||
if (!fname)
|
||||
return 0;
|
||||
|
||||
ret = dwarf_srcfiles(cu_die, &srcs, &cnt, &__dw_error);
|
||||
if (ret == DW_DLV_OK) {
|
||||
for (i = 0; i < cnt && !found; i++) {
|
||||
if (strtailcmp(srcs[i], fname) == 0)
|
||||
found = i + 1;
|
||||
dwarf_dealloc(__dw_debug, srcs[i], DW_DLA_STRING);
|
||||
}
|
||||
for (; i < cnt; i++)
|
||||
dwarf_dealloc(__dw_debug, srcs[i], DW_DLA_STRING);
|
||||
dwarf_dealloc(__dw_debug, srcs, DW_DLA_LIST);
|
||||
}
|
||||
if (found)
|
||||
debug("found fno: %d\n", (int)found);
|
||||
return found;
|
||||
}
|
||||
|
||||
/* Compare diename and tname */
|
||||
static int die_compare_name(Dwarf_Die die, const char *tname)
|
||||
{
|
||||
char *name;
|
||||
int ret;
|
||||
ret = dwarf_diename(die, &name, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_OK) {
|
||||
ret = strcmp(tname, name);
|
||||
dwarf_dealloc(__dw_debug, name, DW_DLA_STRING);
|
||||
} else
|
||||
ret = -1;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Check the address is in the subprogram(function). */
|
||||
static int die_within_subprogram(Dwarf_Die sp_die, Dwarf_Addr addr,
|
||||
Dwarf_Signed *offs)
|
||||
{
|
||||
Dwarf_Addr lopc, hipc;
|
||||
int ret;
|
||||
|
||||
/* TODO: check ranges */
|
||||
ret = dwarf_lowpc(sp_die, &lopc, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_NO_ENTRY)
|
||||
return 0;
|
||||
ret = dwarf_highpc(sp_die, &hipc, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
if (lopc <= addr && addr < hipc) {
|
||||
*offs = addr - lopc;
|
||||
return 1;
|
||||
} else
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Check the die is inlined function */
|
||||
static Dwarf_Bool die_inlined_subprogram(Dwarf_Die die)
|
||||
{
|
||||
/* TODO: check strictly */
|
||||
Dwarf_Bool inl;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_hasattr(die, DW_AT_inline, &inl, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
return inl;
|
||||
}
|
||||
|
||||
/* Get the offset of abstruct_origin */
|
||||
static Dwarf_Off die_get_abstract_origin(Dwarf_Die die)
|
||||
{
|
||||
Dwarf_Attribute attr;
|
||||
Dwarf_Off cu_offs;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_attr(die, DW_AT_abstract_origin, &attr, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
ret = dwarf_formref(attr, &cu_offs, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
|
||||
return cu_offs;
|
||||
}
|
||||
|
||||
/* Get entry pc(or low pc, 1st entry of ranges) of the die */
|
||||
static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
|
||||
{
|
||||
Dwarf_Attribute attr;
|
||||
Dwarf_Addr addr;
|
||||
Dwarf_Off offs;
|
||||
Dwarf_Ranges *ranges;
|
||||
Dwarf_Signed cnt;
|
||||
int ret;
|
||||
|
||||
/* Try to get entry pc */
|
||||
ret = dwarf_attr(die, DW_AT_entry_pc, &attr, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_OK) {
|
||||
ret = dwarf_formaddr(attr, &addr, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
|
||||
return addr;
|
||||
}
|
||||
|
||||
/* Try to get low pc */
|
||||
ret = dwarf_lowpc(die, &addr, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_OK)
|
||||
return addr;
|
||||
|
||||
/* Try to get ranges */
|
||||
ret = dwarf_attr(die, DW_AT_ranges, &attr, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
ret = dwarf_formref(attr, &offs, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
ret = dwarf_get_ranges(__dw_debug, offs, &ranges, &cnt, NULL,
|
||||
&__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
addr = ranges[0].dwr_addr1;
|
||||
dwarf_ranges_dealloc(__dw_debug, ranges, cnt);
|
||||
return addr;
|
||||
}
|
||||
|
||||
/*
|
||||
* Search a Die from Die tree.
|
||||
* Note: cur_link->die should be deallocated in this function.
|
||||
*/
|
||||
static int __search_die_tree(struct die_link *cur_link,
|
||||
int (*die_cb)(struct die_link *, void *),
|
||||
void *data)
|
||||
{
|
||||
Dwarf_Die new_die;
|
||||
struct die_link new_link;
|
||||
int ret;
|
||||
|
||||
if (!die_cb)
|
||||
return 0;
|
||||
|
||||
/* Check current die */
|
||||
while (!(ret = die_cb(cur_link, data))) {
|
||||
/* Check child die */
|
||||
ret = dwarf_child(cur_link->die, &new_die, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_OK) {
|
||||
new_link.parent = cur_link;
|
||||
new_link.die = new_die;
|
||||
ret = __search_die_tree(&new_link, die_cb, data);
|
||||
if (ret)
|
||||
break;
|
||||
}
|
||||
|
||||
/* Move to next sibling */
|
||||
ret = dwarf_siblingof(__dw_debug, cur_link->die, &new_die,
|
||||
&__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
dwarf_dealloc(__dw_debug, cur_link->die, DW_DLA_DIE);
|
||||
cur_link->die = new_die;
|
||||
if (ret == DW_DLV_NO_ENTRY)
|
||||
return 0;
|
||||
}
|
||||
dwarf_dealloc(__dw_debug, cur_link->die, DW_DLA_DIE);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Search a die in its children's die tree */
|
||||
static int search_die_from_children(Dwarf_Die parent_die,
|
||||
int (*die_cb)(struct die_link *, void *),
|
||||
void *data)
|
||||
{
|
||||
struct die_link new_link;
|
||||
int ret;
|
||||
|
||||
new_link.parent = NULL;
|
||||
ret = dwarf_child(parent_die, &new_link.die, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_OK)
|
||||
return __search_die_tree(&new_link, die_cb, data);
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Find a locdesc corresponding to the address */
|
||||
static int attr_get_locdesc(Dwarf_Attribute attr, Dwarf_Locdesc *desc,
|
||||
Dwarf_Addr addr)
|
||||
{
|
||||
Dwarf_Signed lcnt;
|
||||
Dwarf_Locdesc **llbuf;
|
||||
int ret, i;
|
||||
|
||||
ret = dwarf_loclist_n(attr, &llbuf, &lcnt, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
ret = DW_DLV_NO_ENTRY;
|
||||
for (i = 0; i < lcnt; ++i) {
|
||||
if (llbuf[i]->ld_lopc <= addr &&
|
||||
llbuf[i]->ld_hipc > addr) {
|
||||
memcpy(desc, llbuf[i], sizeof(Dwarf_Locdesc));
|
||||
desc->ld_s =
|
||||
malloc(sizeof(Dwarf_Loc) * llbuf[i]->ld_cents);
|
||||
ERR_IF(desc->ld_s == NULL);
|
||||
memcpy(desc->ld_s, llbuf[i]->ld_s,
|
||||
sizeof(Dwarf_Loc) * llbuf[i]->ld_cents);
|
||||
ret = DW_DLV_OK;
|
||||
break;
|
||||
}
|
||||
dwarf_dealloc(__dw_debug, llbuf[i]->ld_s, DW_DLA_LOC_BLOCK);
|
||||
dwarf_dealloc(__dw_debug, llbuf[i], DW_DLA_LOCDESC);
|
||||
}
|
||||
/* Releasing loop */
|
||||
for (; i < lcnt; ++i) {
|
||||
dwarf_dealloc(__dw_debug, llbuf[i]->ld_s, DW_DLA_LOC_BLOCK);
|
||||
dwarf_dealloc(__dw_debug, llbuf[i], DW_DLA_LOCDESC);
|
||||
}
|
||||
dwarf_dealloc(__dw_debug, llbuf, DW_DLA_LIST);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Probe finder related functions
|
||||
*/
|
||||
|
||||
/* Show a location */
|
||||
static void show_location(Dwarf_Loc *loc, struct probe_finder *pf)
|
||||
{
|
||||
Dwarf_Small op;
|
||||
Dwarf_Unsigned regn;
|
||||
Dwarf_Signed offs;
|
||||
int deref = 0, ret;
|
||||
const char *regs;
|
||||
|
||||
op = loc->lr_atom;
|
||||
|
||||
/* If this is based on frame buffer, set the offset */
|
||||
if (op == DW_OP_fbreg) {
|
||||
deref = 1;
|
||||
offs = (Dwarf_Signed)loc->lr_number;
|
||||
op = pf->fbloc.ld_s[0].lr_atom;
|
||||
loc = &pf->fbloc.ld_s[0];
|
||||
} else
|
||||
offs = 0;
|
||||
|
||||
if (op >= DW_OP_breg0 && op <= DW_OP_breg31) {
|
||||
regn = op - DW_OP_breg0;
|
||||
offs += (Dwarf_Signed)loc->lr_number;
|
||||
deref = 1;
|
||||
} else if (op >= DW_OP_reg0 && op <= DW_OP_reg31) {
|
||||
regn = op - DW_OP_reg0;
|
||||
} else if (op == DW_OP_bregx) {
|
||||
regn = loc->lr_number;
|
||||
offs += (Dwarf_Signed)loc->lr_number2;
|
||||
deref = 1;
|
||||
} else if (op == DW_OP_regx) {
|
||||
regn = loc->lr_number;
|
||||
} else
|
||||
msg_exit(-EINVAL, "Dwarf_OP %d is not supported.\n", op);
|
||||
|
||||
regs = get_arch_regstr(regn);
|
||||
if (!regs)
|
||||
msg_exit(-EINVAL, "%lld exceeds max register number.\n", regn);
|
||||
|
||||
if (deref)
|
||||
ret = snprintf(pf->buf, pf->len,
|
||||
" %s=%+lld(%s)", pf->var, offs, regs);
|
||||
else
|
||||
ret = snprintf(pf->buf, pf->len, " %s=%s", pf->var, regs);
|
||||
ERR_IF(ret < 0);
|
||||
ERR_IF(ret >= pf->len);
|
||||
}
|
||||
|
||||
/* Show a variables in kprobe event format */
|
||||
static void show_variable(Dwarf_Die vr_die, struct probe_finder *pf)
|
||||
{
|
||||
Dwarf_Attribute attr;
|
||||
Dwarf_Locdesc ld;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_attr(vr_die, DW_AT_location, &attr, &__dw_error);
|
||||
if (ret != DW_DLV_OK)
|
||||
goto error;
|
||||
ret = attr_get_locdesc(attr, &ld, (pf->addr - pf->cu_base));
|
||||
if (ret != DW_DLV_OK)
|
||||
goto error;
|
||||
/* TODO? */
|
||||
ERR_IF(ld.ld_cents != 1);
|
||||
show_location(&ld.ld_s[0], pf);
|
||||
free(ld.ld_s);
|
||||
dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
|
||||
return ;
|
||||
error:
|
||||
msg_exit(-1, "Failed to find the location of %s at this address.\n"
|
||||
" Perhaps, it was optimized out.\n", pf->var);
|
||||
}
|
||||
|
||||
static int variable_callback(struct die_link *dlink, void *data)
|
||||
{
|
||||
struct probe_finder *pf = (struct probe_finder *)data;
|
||||
Dwarf_Half tag;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_tag(dlink->die, &tag, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if ((tag == DW_TAG_formal_parameter ||
|
||||
tag == DW_TAG_variable) &&
|
||||
(die_compare_name(dlink->die, pf->var) == 0)) {
|
||||
show_variable(dlink->die, pf);
|
||||
return 1;
|
||||
}
|
||||
/* TODO: Support struct members and arrays */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Find a variable in a subprogram die */
|
||||
static void find_variable(Dwarf_Die sp_die, struct probe_finder *pf)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!is_c_varname(pf->var)) {
|
||||
/* Output raw parameters */
|
||||
ret = snprintf(pf->buf, pf->len, " %s", pf->var);
|
||||
ERR_IF(ret < 0);
|
||||
ERR_IF(ret >= pf->len);
|
||||
return ;
|
||||
}
|
||||
|
||||
debug("Searching '%s' variable in context.\n", pf->var);
|
||||
/* Search child die for local variables and parameters. */
|
||||
ret = search_die_from_children(sp_die, variable_callback, pf);
|
||||
if (!ret)
|
||||
msg_exit(-1, "Failed to find '%s' in this function.\n",
|
||||
pf->var);
|
||||
}
|
||||
|
||||
/* Get a frame base on the address */
|
||||
static void get_current_frame_base(Dwarf_Die sp_die, struct probe_finder *pf)
|
||||
{
|
||||
Dwarf_Attribute attr;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_attr(sp_die, DW_AT_frame_base, &attr, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
ret = attr_get_locdesc(attr, &pf->fbloc, (pf->addr - pf->cu_base));
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
|
||||
}
|
||||
|
||||
static void free_current_frame_base(struct probe_finder *pf)
|
||||
{
|
||||
free(pf->fbloc.ld_s);
|
||||
memset(&pf->fbloc, 0, sizeof(Dwarf_Locdesc));
|
||||
}
|
||||
|
||||
/* Show a probe point to output buffer */
|
||||
static void show_probepoint(Dwarf_Die sp_die, Dwarf_Signed offs,
|
||||
struct probe_finder *pf)
|
||||
{
|
||||
struct probe_point *pp = pf->pp;
|
||||
char *name;
|
||||
char tmp[MAX_PROBE_BUFFER];
|
||||
int ret, i, len;
|
||||
|
||||
/* Output name of probe point */
|
||||
ret = dwarf_diename(sp_die, &name, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_OK) {
|
||||
ret = snprintf(tmp, MAX_PROBE_BUFFER, "%s+%u", name,
|
||||
(unsigned int)offs);
|
||||
dwarf_dealloc(__dw_debug, name, DW_DLA_STRING);
|
||||
} else {
|
||||
/* This function has no name. */
|
||||
ret = snprintf(tmp, MAX_PROBE_BUFFER, "0x%llx", pf->addr);
|
||||
}
|
||||
ERR_IF(ret < 0);
|
||||
ERR_IF(ret >= MAX_PROBE_BUFFER);
|
||||
len = ret;
|
||||
|
||||
/* Find each argument */
|
||||
get_current_frame_base(sp_die, pf);
|
||||
for (i = 0; i < pp->nr_args; i++) {
|
||||
pf->var = pp->args[i];
|
||||
pf->buf = &tmp[len];
|
||||
pf->len = MAX_PROBE_BUFFER - len;
|
||||
find_variable(sp_die, pf);
|
||||
len += strlen(pf->buf);
|
||||
}
|
||||
free_current_frame_base(pf);
|
||||
|
||||
pp->probes[pp->found] = strdup(tmp);
|
||||
pp->found++;
|
||||
}
|
||||
|
||||
static int probeaddr_callback(struct die_link *dlink, void *data)
|
||||
{
|
||||
struct probe_finder *pf = (struct probe_finder *)data;
|
||||
Dwarf_Half tag;
|
||||
Dwarf_Signed offs;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_tag(dlink->die, &tag, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
/* Check the address is in this subprogram */
|
||||
if (tag == DW_TAG_subprogram &&
|
||||
die_within_subprogram(dlink->die, pf->addr, &offs)) {
|
||||
show_probepoint(dlink->die, offs, pf);
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Find probe point from its line number */
|
||||
static void find_by_line(Dwarf_Die cu_die, struct probe_finder *pf)
|
||||
{
|
||||
struct probe_point *pp = pf->pp;
|
||||
Dwarf_Signed cnt, i;
|
||||
Dwarf_Line *lines;
|
||||
Dwarf_Unsigned lineno = 0;
|
||||
Dwarf_Addr addr;
|
||||
Dwarf_Unsigned fno;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_srclines(cu_die, &lines, &cnt, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
|
||||
for (i = 0; i < cnt; i++) {
|
||||
ret = dwarf_line_srcfileno(lines[i], &fno, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
if (fno != pf->fno)
|
||||
continue;
|
||||
|
||||
ret = dwarf_lineno(lines[i], &lineno, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
if (lineno != (Dwarf_Unsigned)pp->line)
|
||||
continue;
|
||||
|
||||
ret = dwarf_lineaddr(lines[i], &addr, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
debug("Probe point found: 0x%llx\n", addr);
|
||||
pf->addr = addr;
|
||||
/* Search a real subprogram including this line, */
|
||||
ret = search_die_from_children(cu_die, probeaddr_callback, pf);
|
||||
if (ret == 0)
|
||||
msg_exit(-1,
|
||||
"Probe point is not found in subprograms.\n");
|
||||
/* Continuing, because target line might be inlined. */
|
||||
}
|
||||
dwarf_srclines_dealloc(__dw_debug, lines, cnt);
|
||||
}
|
||||
|
||||
/* Search function from function name */
|
||||
static int probefunc_callback(struct die_link *dlink, void *data)
|
||||
{
|
||||
struct probe_finder *pf = (struct probe_finder *)data;
|
||||
struct probe_point *pp = pf->pp;
|
||||
struct die_link *lk;
|
||||
Dwarf_Signed offs;
|
||||
Dwarf_Half tag;
|
||||
int ret;
|
||||
|
||||
ret = dwarf_tag(dlink->die, &tag, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (tag == DW_TAG_subprogram) {
|
||||
if (die_compare_name(dlink->die, pp->function) == 0) {
|
||||
if (die_inlined_subprogram(dlink->die)) {
|
||||
/* Inlined function, save it. */
|
||||
ret = dwarf_die_CU_offset(dlink->die,
|
||||
&pf->inl_offs,
|
||||
&__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
debug("inline definition offset %lld\n",
|
||||
pf->inl_offs);
|
||||
return 0;
|
||||
}
|
||||
/* Get probe address */
|
||||
pf->addr = die_get_entrypc(dlink->die);
|
||||
pf->addr += pp->offset;
|
||||
/* TODO: Check the address in this function */
|
||||
show_probepoint(dlink->die, pp->offset, pf);
|
||||
/* Continue to search */
|
||||
}
|
||||
} else if (tag == DW_TAG_inlined_subroutine && pf->inl_offs) {
|
||||
if (die_get_abstract_origin(dlink->die) == pf->inl_offs) {
|
||||
/* Get probe address */
|
||||
pf->addr = die_get_entrypc(dlink->die);
|
||||
pf->addr += pp->offset;
|
||||
debug("found inline addr: 0x%llx\n", pf->addr);
|
||||
/* Inlined function. Get a real subprogram */
|
||||
for (lk = dlink->parent; lk != NULL; lk = lk->parent) {
|
||||
tag = 0;
|
||||
dwarf_tag(lk->die, &tag, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (tag == DW_TAG_subprogram &&
|
||||
!die_inlined_subprogram(lk->die))
|
||||
goto found;
|
||||
}
|
||||
msg_exit(-1, "Failed to find real subprogram.\n");
|
||||
found:
|
||||
/* Get offset from subprogram */
|
||||
ret = die_within_subprogram(lk->die, pf->addr, &offs);
|
||||
ERR_IF(!ret);
|
||||
show_probepoint(lk->die, offs, pf);
|
||||
/* Continue to search */
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void find_by_func(Dwarf_Die cu_die, struct probe_finder *pf)
|
||||
{
|
||||
search_die_from_children(cu_die, probefunc_callback, pf);
|
||||
}
|
||||
|
||||
/* Find a probe point */
|
||||
int find_probepoint(int fd, struct probe_point *pp)
|
||||
{
|
||||
Dwarf_Half addr_size = 0;
|
||||
Dwarf_Unsigned next_cuh = 0;
|
||||
Dwarf_Die cu_die = 0;
|
||||
int cu_number = 0, ret;
|
||||
struct probe_finder pf = {.pp = pp};
|
||||
|
||||
ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
|
||||
if (ret != DW_DLV_OK)
|
||||
msg_exit(-1, "Failed to call dwarf_init(). "
|
||||
"Maybe, not a dwarf file?\n");
|
||||
|
||||
pp->found = 0;
|
||||
while (++cu_number) {
|
||||
/* Search CU (Compilation Unit) */
|
||||
ret = dwarf_next_cu_header(__dw_debug, NULL, NULL, NULL,
|
||||
&addr_size, &next_cuh, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_NO_ENTRY)
|
||||
break;
|
||||
|
||||
/* Get the DIE(Debugging Information Entry) of this CU */
|
||||
ret = dwarf_siblingof(__dw_debug, 0, &cu_die, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
|
||||
/* Check if target file is included. */
|
||||
if (pp->file)
|
||||
pf.fno = die_get_fileno(cu_die, pp->file);
|
||||
|
||||
if (!pp->file || pf.fno) {
|
||||
/* Save CU base address (for frame_base) */
|
||||
ret = dwarf_lowpc(cu_die, &pf.cu_base, &__dw_error);
|
||||
ERR_IF(ret == DW_DLV_ERROR);
|
||||
if (ret == DW_DLV_NO_ENTRY)
|
||||
pf.cu_base = 0;
|
||||
if (pp->line)
|
||||
find_by_line(cu_die, &pf);
|
||||
if (pp->function)
|
||||
find_by_func(cu_die, &pf);
|
||||
}
|
||||
dwarf_dealloc(__dw_debug, cu_die, DW_DLA_DIE);
|
||||
}
|
||||
ret = dwarf_finish(__dw_debug, &__dw_error);
|
||||
ERR_IF(ret != DW_DLV_OK);
|
||||
|
||||
return pp->found;
|
||||
}
|
||||
|
||||
68
tools/perf/util/probe-finder.h
Normal file
68
tools/perf/util/probe-finder.h
Normal file
|
|
@ -0,0 +1,68 @@
|
|||
#ifndef _PROBE_FINDER_H
|
||||
#define _PROBE_FINDER_H
|
||||
|
||||
#define _stringify(n) #n
|
||||
#define stringify(n) _stringify(n)
|
||||
|
||||
#ifdef DEBUG
|
||||
#define debug(fmt ...) \
|
||||
fprintf(stderr, "DBG(" __FILE__ ":" stringify(__LINE__) "): " fmt)
|
||||
#else
|
||||
#define debug(fmt ...) do {} while (0)
|
||||
#endif
|
||||
|
||||
#define ERR_IF(cnd) \
|
||||
do { if (cnd) { \
|
||||
fprintf(stderr, "Error (" __FILE__ ":" stringify(__LINE__) \
|
||||
"): " stringify(cnd) "\n"); \
|
||||
exit(1); \
|
||||
} } while (0)
|
||||
|
||||
#define MAX_PATH_LEN 256
|
||||
#define MAX_PROBE_BUFFER 1024
|
||||
#define MAX_PROBES 128
|
||||
|
||||
static inline int is_c_varname(const char *name)
|
||||
{
|
||||
/* TODO */
|
||||
return isalpha(name[0]) || name[0] == '_';
|
||||
}
|
||||
|
||||
struct probe_point {
|
||||
/* Inputs */
|
||||
char *file; /* File name */
|
||||
int line; /* Line number */
|
||||
|
||||
char *function; /* Function name */
|
||||
int offset; /* Offset bytes */
|
||||
|
||||
int nr_args; /* Number of arguments */
|
||||
char **args; /* Arguments */
|
||||
|
||||
/* Output */
|
||||
int found; /* Number of found probe points */
|
||||
char *probes[MAX_PROBES]; /* Output buffers (will be allocated)*/
|
||||
};
|
||||
|
||||
extern int find_probepoint(int fd, struct probe_point *pp);
|
||||
|
||||
#include <libdwarf/dwarf.h>
|
||||
#include <libdwarf/libdwarf.h>
|
||||
|
||||
struct probe_finder {
|
||||
struct probe_point *pp; /* Target probe point */
|
||||
|
||||
/* For function searching */
|
||||
Dwarf_Addr addr; /* Address */
|
||||
Dwarf_Unsigned fno; /* File number */
|
||||
Dwarf_Off inl_offs; /* Inline offset */
|
||||
|
||||
/* For variable searching */
|
||||
Dwarf_Addr cu_base; /* Current CU base address */
|
||||
Dwarf_Locdesc fbloc; /* Location of Current Frame Base */
|
||||
const char *var; /* Current variable name */
|
||||
char *buf; /* Current output buffer */
|
||||
int len; /* Length of output buffer */
|
||||
};
|
||||
|
||||
#endif /*_PROBE_FINDER_H */
|
||||
Loading…
Reference in a new issue