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authorMasami Hiramatsu <mhiramat@redhat.com>2010-03-16 18:06:19 -0400
committerIngo Molnar <mingo@elte.hu>2010-03-17 11:32:32 +0100
commitfb1587d869a399554220e166d4b90b581a8ade01 (patch)
tree64ae42dc601f702f6d8409a74d4c3b2e242cdc93 /tools/perf/util/probe-finder.c
parent4235b0454ebeefc2295ad8417e18a8761425b19e (diff)
perf probe: List probes with line number and file name
Improve --list to show current exist probes with line number and file name. This enables user easily to check which line is already probed. for example: ./perf probe --list probe:vfs_read (on vfs_read:8@linux-2.6-tip/fs/read_write.c) Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100316220619.32050.48702.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/probe-finder.c')
-rw-r--r--tools/perf/util/probe-finder.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 251b4c49653e..e02b60770485 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -693,6 +693,76 @@ int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
return pf.ntevs;
}
+/* Reverse search */
+int find_perf_probe_point(int fd, unsigned long addr,
+ struct perf_probe_point *ppt)
+{
+ Dwarf_Die cudie, spdie, indie;
+ Dwarf *dbg;
+ Dwarf_Line *line;
+ Dwarf_Addr laddr, eaddr;
+ const char *tmp;
+ int lineno, ret = 0;
+
+ dbg = dwarf_begin(fd, DWARF_C_READ);
+ if (!dbg)
+ return -ENOENT;
+
+ /* Find cu die */
+ if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr, &cudie))
+ return -EINVAL;
+
+ /* Find a corresponding line */
+ line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr);
+ if (line) {
+ dwarf_lineaddr(line, &laddr);
+ if ((Dwarf_Addr)addr == laddr) {
+ dwarf_lineno(line, &lineno);
+ ppt->line = lineno;
+
+ tmp = dwarf_linesrc(line, NULL, NULL);
+ DIE_IF(!tmp);
+ ppt->file = xstrdup(tmp);
+ ret = 1;
+ }
+ }
+
+ /* Find a corresponding function */
+ if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) {
+ tmp = dwarf_diename(&spdie);
+ if (!tmp)
+ goto end;
+
+ dwarf_entrypc(&spdie, &eaddr);
+ if (!lineno) {
+ /* We don't have a line number, let's use offset */
+ ppt->function = xstrdup(tmp);
+ ppt->offset = addr - (unsigned long)eaddr;
+ ret = 1;
+ goto end;
+ }
+ if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, &indie)) {
+ /* addr in an inline function */
+ tmp = dwarf_diename(&indie);
+ if (!tmp)
+ goto end;
+ dwarf_decl_line(&indie, &lineno);
+ } else {
+ if (eaddr == addr) /* No offset: function entry */
+ lineno = ppt->line;
+ else
+ dwarf_decl_line(&spdie, &lineno);
+ }
+ ppt->function = xstrdup(tmp);
+ ppt->line -= lineno; /* Make a relative line number */
+ }
+
+end:
+ dwarf_end(dbg);
+ return ret;
+}
+
+
/* Find line range from its line number */
static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
{