diff options
authorJean Pihet <>2014-02-03 18:18:29 (GMT)
committerChanho Park <>2014-04-16 12:36:50 (GMT)
commit290a3ddd86861ddd8299ad3884ceb59f85fc8033 (patch)
parentf5cb6ed3328c3e41ea641266e60e3eed9ec105a7 (diff)
ARM64: perf: support dwarf unwinding in compat mode
Add support for unwinding using the dwarf information in compat mode. Using the correct user stack pointer allows perf to record the frames correctly in the native and compat modes. Note that although the dwarf frame unwinding works ok using libunwind in native mode (on ARMv7 & ARMv8), some changes are required to the libunwind code for the compat mode. Those changes are posted separately on the libunwind mailing list. Tested on ARMv8 platform with v8 and compat v7 binaries, the latter are statically built. Signed-off-by: Jean Pihet <> Acked-by: Will Deacon <> Signed-off-by: Catalin Marinas <>
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
index fda2704..e71f81f 100644
--- a/arch/arm64/include/asm/compat.h
+++ b/arch/arm64/include/asm/compat.h
@@ -228,7 +228,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
return (u32)(unsigned long)uptr;
-#define compat_user_stack_pointer() (current_pt_regs()->compat_sp)
+#define compat_user_stack_pointer() (user_stack_pointer(current_pt_regs()))
static inline void __user *arch_compat_alloc_user_space(long len)
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 35ff2f9..c7ba261 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -133,7 +133,7 @@ struct pt_regs {
(!((regs)->pstate & PSR_F_BIT))
#define user_stack_pointer(regs) \
- ((regs)->sp)
+ (!compat_user_mode(regs)) ? ((regs)->sp) : ((regs)->compat_sp)
* Are the current registers suitable for user mode? (used to maintain