linux-kernel - [RFC PATCH 02/21] stackvalidate: Add C version of STACKVALIDATE_IGNORE

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Date:	Fri, 17 Jul 2015 11:47:18 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 02/21] stackvalidate: Add C version of STACKVALIDATE_IGNORE_INSN

Add a C inline asm string version of the STACKVALIDATE_IGNORE_INSN macro
which tells stackvalidate to ignore the subsequent instruction.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/include/asm/stackvalidate.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/include/asm/stackvalidate.h b/arch/x86/include/asm/stackvalidate.h
index 2d23c23..dac935c 100644
--- a/arch/x86/include/asm/stackvalidate.h
+++ b/arch/x86/include/asm/stackvalidate.h
@@ -23,6 +23,15 @@
 	.endif
 .endm
 
+#else /* !__ASSEMBLY__ */
+
+#define STACKVALIDATE_IGNORE_INSN				\
+	".Ltemp" __stringify(__LINE__) ":;"			\
+	".pushsection __stackvalidate_ignore_insn, \"a\";"	\
+	_ASM_ALIGN ";"						\
+	".long .Ltemp" __stringify(__LINE__) " - .;"		\
+	".popsection;"
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_X86_STACKVALIDATE_H */
-- 
2.1.0

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