linux-kernel - [PATCH 6/6] arm: LLVMLinux: Use current_stack_pointer in unwind

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Date:	Tue,  8 Jul 2014 13:16:16 -0700
From:	behanw@...verseincode.com
To:	anurag19aggarwal@...il.com, catalin.marinas@....com,
	charlebm@...il.com, dave.long@...aro.org, k.khlebnikov@...sung.com,
	linux@....linux.org.uk, linyongting@...il.com,
	Nikolay.Borisov@....com, tglx@...utronix.de,
	u.kleine-koenig@...gutronix.de, will.deacon@....com
Cc:	behanw@...verseincode.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, rabin@....in, rostedt@...dmis.org,
	dwmw2@...radead.org
Subject: [PATCH 6/6] arm: LLVMLinux: Use current_stack_pointer in unwind_backtrace

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

Use the global current_stack_pointer to get the value of the stack pointer.
This change supports being able to compile the kernel with both gcc and clang.

Signed-off-by: Behan Webster <behanw@...verseincode.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Reviewed-by: Jan-Simon M??ller <dl9pf@....de>
---
 arch/arm/kernel/unwind.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index e67682f..e20e8dc 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -471,7 +471,6 @@ int unwind_frame(struct stackframe *frame)
 void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 {
 	struct stackframe frame;
-	register unsigned long current_sp asm ("sp");
 
 	pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
 
@@ -487,7 +486,7 @@ void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 			 ? regs->ARM_pc : regs->ARM_lr;
 	} else if (tsk == current) {
 		frame.fp = (unsigned long)__builtin_frame_address(0);
-		frame.sp = current_sp;
+		frame.sp = current_stack_pointer;
 		frame.lr = (unsigned long)__builtin_return_address(0);
 		frame.pc = (unsigned long)unwind_backtrace;
 	} else {
-- 
1.9.1

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