linux-kernel - [PATCH V2 6/6] arm64: LLVMLinux: Use global stack pointer in return

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Date:	Tue, 26 Aug 2014 21:29:34 -0700
From:	behanw@...verseincode.com
To:	ard.biesheuvel@...aro.org, catalin.marinas@....com,
	cl@...ux-foundation.org, jays.lee@...sung.com,
	k.khlebnikov@...sung.com, larry.bassel@...aro.org, olof@...om.net,
	peterz@...radead.org, takahiro.akashi@...aro.org,
	tglx@...utronix.de, tj@...nel.org, will.deacon@....com
Cc:	christoffer.dall@...aro.org, kgene.kim@...sung.com,
	khilman@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, sungjinn.chung@...sung.com,
	Behan Webster <behanw@...verseincode.com>,
	Mark Charlebois <charlebm@...il.com>
Subject: [PATCH V2 6/6] arm64: LLVMLinux: Use global stack pointer in return_address()

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

The global register current_stack_pointer holds the current stack pointer.
This change supports being able to compile the kernel with both gcc and clang.

Author: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Behan Webster <behanw@...verseincode.com>
---
 arch/arm64/kernel/return_address.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/return_address.c b/arch/arm64/kernel/return_address.c
index 89102a6..6c4fd28 100644
--- a/arch/arm64/kernel/return_address.c
+++ b/arch/arm64/kernel/return_address.c
@@ -36,13 +36,12 @@ void *return_address(unsigned int level)
 {
 	struct return_address_data data;
 	struct stackframe frame;
-	register unsigned long current_sp asm ("sp");
 
 	data.level = level + 2;
 	data.addr = NULL;
 
 	frame.fp = (unsigned long)__builtin_frame_address(0);
-	frame.sp = current_sp;
+	frame.sp = current_stack_pointer;
 	frame.pc = (unsigned long)return_address; /* dummy */
 
 	walk_stackframe(&frame, save_return_addr, &data);
-- 
1.9.1

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