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Date: Tue, 26 May 2020 10:46:20 +0800 From: Jiping Ma <Jiping.Ma2@...driver.com> To: will.deacon@....com, paul.gortmaker@...driver.com, mark.rutland@....com, catalin.marinas@....com, bruce.ashfield@...il.com, yue.tao@...driver.com Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, zhe.he@...driver.com Subject: Re: [PATCH][V3] arm64: perf: Get the wrong PC value in REGS_ABI_32 mode Hi, Will Please help to review the change. Thanks, Jiping On 05/11/2020 10:52 AM, Jiping Ma wrote: > 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@...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..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]; > } >
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