linux-kernel - [PATCH v2 2/7] arm: LLVMLinux: Use current_stack_pointer to calculate pt

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Date:	Fri,  5 Sep 2014 17:06:12 -0700
From:	behanw@...verseincode.com
To:	a.ryabinin@...sung.com, anurag19aggarwal@...il.com,
	charlebm@...il.com, cl@...ux-foundation.org, dave.long@...aro.org,
	k.khlebnikov@...sung.com, linux@....linux.org.uk,
	linyongting@...il.com, Nikolay.Borisov@....com, tglx@...utronix.de,
	tj@...nel.org, u.kleine-koenig@...gutronix.de
Cc:	behanw@...verseincode.com, Dave.Martin@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	rabin@....in, rostedt@...dmis.org, rric@...nel.org,
	will.deacon@....com
Subject: [PATCH v2 2/7] arm: LLVMLinux: Use current_stack_pointer to calculate pt_regs address

From: Behan Webster <behanw@...verseincode.com>

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

Signed-off-by: Behan Webster <behanw@...verseincode.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Reviewed-by: Jan-Simon Möller <dl9pf@....de>
---
 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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