[RFC 09/16] arm64: assembler: Add macro to annotate asm function having non standard stack-frame.

From: Raphael Gault
Date: Thu May 16 2019 - 06:40:46 EST


Some functions don't have standard stack-frames but are intended
this way. In order for objtool to ignore those particular cases
we add a macro that enables us to annotate the cases we chose
to mark as particular.

Signed-off-by: Raphael Gault <raphael.gault@xxxxxxx>
---
arch/arm64/include/asm/assembler.h | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index c5308d01e228..8948474a9bcb 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -760,4 +760,17 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU
.Lyield_out_\@ :
.endm

+ /*
+ * This macro is the arm64 assembler equivalent of the
+ * macro STACK_FRAME_NON_STANDARD define at
+ * ~/include/linux/frame.h
+ */
+ .macro asm_stack_frame_non_standard func
+#ifdef CONFIG_STACK_VALIDATION
+ .pushsection ".discard.func_stack_frame_non_standard"
+ .8byte \func
+ .popsection
+#endif
+ .endm
+
#endif /* __ASM_ASSEMBLER_H */
--
2.17.1