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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-26 15:09:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-26 15:09:33 -0700 |
| commit | 6fa41366c1c5e8b9640baba22d2b90ec9035a889 (patch) | |
| tree | ad3b2214e0c5d4774f200ab7bb08b832babb9468 /arch/powerpc/kernel | |
| parent | 309d1dcb5b73ab1f8212aff3037a7bcb46afe819 (diff) | |
| parent | 9eff26ea48bfbe2885b158742a7512a097ec911b (diff) | |
Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
powerpc/perf_events: Fix call-graph recording, add perf_arch_fetch_caller_regs
perf top: Add missing initialization to zero
perf probe: Use original address instead of CU-based address
perf probe: Fix offset to allow signed value
perf top: Improve the autosizing of column lenghts
perf probe: Fix need_dwarf flag if lazy matching is used
perf probe: Fix probe_point buffer overrun
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/misc.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S index 2d29752cbe16..b485a87c94e1 100644 --- a/arch/powerpc/kernel/misc.S +++ b/arch/powerpc/kernel/misc.S @@ -127,3 +127,31 @@ _GLOBAL(__setup_cpu_power7) _GLOBAL(__restore_cpu_power7) /* place holder */ blr + +#ifdef CONFIG_EVENT_TRACING +/* + * Get a minimal set of registers for our caller's nth caller. + * r3 = regs pointer, r5 = n. + * + * We only get R1 (stack pointer), NIP (next instruction pointer) + * and LR (link register). These are all we can get in the + * general case without doing complicated stack unwinding, but + * fortunately they are enough to do a stack backtrace, which + * is all we need them for. + */ +_GLOBAL(perf_arch_fetch_caller_regs) + mr r6,r1 + cmpwi r5,0 + mflr r4 + ble 2f + mtctr r5 +1: PPC_LL r6,0(r6) + bdnz 1b + PPC_LL r4,PPC_LR_STKOFF(r6) +2: PPC_LL r7,0(r6) + PPC_LL r7,PPC_LR_STKOFF(r7) + PPC_STL r6,GPR1-STACK_FRAME_OVERHEAD(r3) + PPC_STL r4,_NIP-STACK_FRAME_OVERHEAD(r3) + PPC_STL r7,_LINK-STACK_FRAME_OVERHEAD(r3) + blr +#endif /* CONFIG_EVENT_TRACING */ |