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arm64: LLVMLinux: Use global stack pointer in return_address()

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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@gmail.com>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Behan Webster 2014-08-27 05:29:34 +01:00 committed by Will Deacon
parent 34ccf8f455
commit a4ceab1adb
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/kernel/return_address.c
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@ -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);