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

[Jiping Ma]

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....@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