Messages in this thread Patch in this message | | | From | Jiping Ma <> | Subject | [PATCH][V3] arm64: perf: Get the wrong PC value in REGS_ABI_32 mode | Date | Mon, 11 May 2020 10:52:07 +0800 |
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Modified the patch subject and the change description.
PC value is get from regs[15] in REGS_ABI_32 mode, but correct PC is regs->pc(regs[PERF_REG_ARM64_PC]) in arm64 kernel, which caused that perf can not parser the backtrace of app with dwarf mode in the 32bit system and 64bit kernel.
Signed-off-by: Jiping Ma <jiping.ma2@windriver.com> --- arch/arm64/kernel/perf_regs.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c index 0bbac61..0ef2880 100644 --- a/arch/arm64/kernel/perf_regs.c +++ b/arch/arm64/kernel/perf_regs.c @@ -32,6 +32,10 @@ u64 perf_reg_value(struct pt_regs *regs, int idx) if ((u32)idx == PERF_REG_ARM64_PC) return regs->pc; + if (perf_reg_abi(current) == PERF_SAMPLE_REGS_ABI_32 + && idx == 15) + return regs->pc; + return regs->regs[idx]; } -- 1.9.1
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