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Date: Thu, 7 May 2020 09:04:08 +0800 From: Jiping Ma <jiping.ma2@...driver.com> To: <will.deacon@....com>, <mark.rutland@....com>, <catalin.marinas@....com>, <jiping.ma2@...driver.com> CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH] perf: perf can not parser the backtrace of app with dwarf mode in the 32bit system and 64bit kernel. Record PC value from regs[15], it should be regs[32] in REGS_ABI_32 mode, which cause perf parser the backtrace failed. Signed-off-by: Jiping Ma <jiping.ma2@...driver.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..04088e6 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->regs[PERF_REG_ARM64_PC]; + return regs->regs[idx]; } -- 1.9.1
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