Masami Hiramatsu a34a985499 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>		2010-04-14 17:28:20 -03:00
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perf	perf probe: Support DW_OP_call_frame_cfa in debuginfo	2010-04-14 17:28:20 -03:00