Messages in this thread Patch in this message | | | From | Seung-Woo Kim <> | Subject | [PATCH] arm64: perf: Report arm pc registers for compat perf | Date | Tue, 12 Nov 2019 10:01:41 +0900 |
| |
If perf is built as arm 32-bit, it only reads 15 registers as arm 32-bit register map and this breaks dwarf call-chain in compat perf because pc register information is not filled. Report arm pc registers for 32-bit compat perf.
Without this, arm 32-bit perf dwarf call-graph shows below verbose message: unwind: reg 15, val 0 unwind: reg 13, val ffbc6360 unwind: no map for 0
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com> --- arch/arm64/kernel/perf_regs.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c index 0bbac61..d4172e7 100644 --- a/arch/arm64/kernel/perf_regs.c +++ b/arch/arm64/kernel/perf_regs.c @@ -24,6 +24,8 @@ u64 perf_reg_value(struct pt_regs *regs, int idx) return regs->compat_sp; if ((u32)idx == PERF_REG_ARM64_LR) return regs->compat_lr; + if ((u32)idx == 15) /* PERF_REG_ARM_PC */ + return regs->pc; } if ((u32)idx == PERF_REG_ARM64_SP) -- 1.7.4.1
| |