From: Behan Webster <[email protected]> Use the frame pointer to calculate the end of the stack for current_pt_regs() The existing code uses the stack pointer to do this calculation. Using the frame pointer yeilds the same value in a more portable way. This change supports being able to compile the kernel with gcc and clang.
Signed-off-by: Mark Charlebois <[email protected]> Signed-off-by: Behan Webster <[email protected]> Reviewed-by: Jan-Simon Möller <[email protected]> --- arch/arm/include/asm/ptrace.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 04c99f3..8aec2db 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -138,9 +138,9 @@ 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 *)(((unsigned long)(__builtin_frame_address(0)) \ + | (THREAD_SIZE - 1)) - 7) - 1; \ }) #endif /* __ASSEMBLY__ */ -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
