[PATCH] perf: perf can not parser the backtrace of app with dwarf mode in the 32bit system and 64bit kernel.

From: Jiping Ma
Date: Wed May 06 2020 - 21:05:17 EST


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@xxxxxxxxxxxxx>
---
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