* [PATCH] perf: perf can not parser the backtrace of app with dwarf mode in the 32bit system and 64bit kernel.
@ 2020-05-08 1:47 Jiping Ma
0 siblings, 0 replies; 2+ messages in thread
From: Jiping Ma @ 2020-05-08 1:47 UTC (permalink / raw)
To: will.deacon, paul.gortmaker, mark.rutland, catalin.marinas,
jiping.ma2, bruce.ashfield, yue.tao
Cc: linux-arm-kernel, linux-kernel, zhe.he
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@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..4e5c68e 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)
+ idx = PERF_REG_ARM64_PC;
+
return regs->regs[idx];
}
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] perf: perf can not parser the backtrace of app with dwarf mode in the 32bit system and 64bit kernel.
@ 2020-05-07 1:04 Jiping Ma
0 siblings, 0 replies; 2+ messages in thread
From: Jiping Ma @ 2020-05-07 1:04 UTC (permalink / raw)
To: will.deacon, mark.rutland, catalin.marinas, jiping.ma2
Cc: linux-arm-kernel, linux-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@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..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
^ permalink raw reply related [flat|nested] 2+ messages in thread
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