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authorMasami Hiramatsu <mhiramat@redhat.com>2010-04-12 21:17:29 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-04-15 00:28:20 +0400
commita34a985499895a46a4dacff727d0fbc63cdc75e8 (patch)
tree84905a8248ab1b35403e676609dd120c85c1dd97 /tools/perf/util/probe-finder.h
parent11a1ca3554b377d2a8a318a3cbf8ce10a7a2a8e4 (diff)
downloadlinux-a34a985499895a46a4dacff727d0fbc63cdc75e8.tar.xz
perf probe: Support DW_OP_call_frame_cfa in debuginfo
When building kernel without CONFIG_FRAME_POINTER, gcc uses CFA (canonical frame address) for frame base. With this patch, perf probe just gets CFI (call frame information) from debuginfo and search corresponding CFA from the CFI. IOW, this allows perf probe works correctly on the kernel without CONFIG_FRAME_POINTER. <Before> ./perf probe -fn sched_slice:12 lw.weight Fatal: DW_OP 156 is not supported. (^^^ DW_OP_call_frame_cfa) <After> ./perf probe -fn sched_slice:12 lw.weight Add new event: probe:sched_slice (on sched_slice:12 with weight=lw.weight) Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20100412171728.3790.98217.stgit@localhost6.localdomain6> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/probe-finder.h')
-rw-r--r--tools/perf/util/probe-finder.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 2a271321944f..310ce897229c 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -42,6 +42,7 @@ struct probe_finder {
struct list_head lcache; /* Line cache for lazy match */
/* For variable searching */
+ Dwarf_CFI *cfi; /* Call Frame Information */
Dwarf_Op *fb_ops; /* Frame base attribute */
struct perf_probe_arg *pvar; /* Current target variable */
struct kprobe_trace_arg *tvar; /* Current result variable */