linux-kernel - [RFC V3 12/18] arm64: assembler: Add macro to annotate asm function having non standard stack-frame.

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Date:   Mon, 24 Jun 2019 10:55:42 +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 V3 12/18] 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 570d195a184d..969a59c5c276 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -752,4 +752,17 @@ 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