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powerpc/perf: Move code to select SIAR or pt_regs into perf_read_regs

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The logic to choose whether to use the SIAR or get the information
out of pt_regs is going to get more complicated, so do it once in
perf_read_regs.

We overload regs->result which is gross but we are already doing it
with regs->dsisr.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard
2012-06-26 01:01:36 +00:00
committed by Benjamin Herrenschmidt
parent 68b30bb9f0
commit 75382aa72f
2 changed files with 30 additions and 22 deletions
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5
arch/powerpc/include/asm/perf_event.h
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@@ -26,8 +26,13 @@
#include <asm/ptrace.h>
#include <asm/reg.h>
/*
* Overload regs->result to specify whether we should use the MSR (result
* is zero) or the SIAR (result is non zero).
*/
#define perf_arch_fetch_caller_regs(regs, __ip) \
do { \
(regs)->result = 0; \
(regs)->nip = __ip; \
(regs)->gpr[1] = *(unsigned long *)__get_SP(); \
asm volatile("mfmsr %0" : "=r" ((regs)->msr)); \