[PATCH v2 2/7] arm: LLVMLinux: Use current_stack_pointer to calculate pt_regs address

[behanw]

From: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>

Use the global current_stack_pointer to calculate the end of the stack for
current_pt_regs()

Signed-off-by: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Mark Charlebois <charlebm@xxxxxxxxx>
Reviewed-by: Jan-Simon MÃller <dl9pf@xxxxxx>
---
 arch/arm/include/asm/ptrace.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index 601264d..51622ba 100644
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -154,9 +154,8 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
 	return regs->ARM_sp;
 }
 
-#define current_pt_regs(void) ({				\
-	register unsigned long sp asm ("sp");			\
-	(struct pt_regs *)((sp | (THREAD_SIZE - 1)) - 7) - 1;	\
+#define current_pt_regs(void) ({ (struct pt_regs *)			\
+		((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1;	\
 })
 
 #endif /* __ASSEMBLY__ */
-- 
1.9.1

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