From: Julien Thierry <jthierry@xxxxxxxxxx> When taking an exception/interrupt, add unwind hints to indicate from which point the stack pointer is known to be valid. Signed-off-by: Julien Thierry <jthierry@xxxxxxxxxx> Signed-off-by: Chen Zhongjin <chenzhongjin@xxxxxxxxxx> --- arch/arm64/kernel/entry.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 10fac8f13982..eeb576ec97ba 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -68,6 +68,7 @@ tbnz x0, #THREAD_SHIFT, 0f sub x0, sp, x0 // x0'' = sp' - x0' = (sp + x0) - sp = x0 sub sp, sp, x0 // sp'' = sp' - x0 = (sp + x0) - x0 = sp + UNWIND_HINT_FUNC sp_offset=S_FRAME_SIZE b el\el\ht\()_\regsize\()_\label 0: @@ -100,6 +101,7 @@ sub sp, sp, x0 mrs x0, tpidrro_el0 #endif + UNWIND_HINT_FUNC sp_offset=S_FRAME_SIZE b el\el\ht\()_\regsize\()_\label .org .Lventry_start\@ + 128 // Did we overflow the ventry slot? .endm -- 2.17.1
