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Message-Id: <20190516103655.5509-10-raphael.gault@arm.com>
Date: Thu, 16 May 2019 11:36:48 +0100
From: Raphael Gault <raphael.gault@....com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: jpoimboe@...hat.com, peterz@...radead.org, catalin.marinas@....com,
will.deacon@....com, julien.thierry@....com,
Raphael Gault <raphael.gault@....com>
Subject: [RFC 09/16] arm64: assembler: Add macro to annotate asm function having non standard stack-frame.
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@....com>
---
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
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