linux-kernel - [PATCH v6 3/4] arm64: Add regs_return

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Message-Id: <1398851492-16345-4-git-send-email-takahiro.akashi@linaro.org>
Date:	Wed, 30 Apr 2014 18:51:31 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	will.deacon@....com
Cc:	viro@...iv.linux.org.uk, eparis@...hat.com, rgb@...hat.com,
	catalin.marinas@....com, dsaxena@...aro.org, arndb@...db.de,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-audit@...hat.com,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [PATCH v6 3/4] arm64: Add regs_return_value() in syscall.h

This macro, regs_return_value, is used mainly for audit to record system
call's results, but may also be used in test_kprobes.c.

Acked-by: Will Deacon <will.deacon@....com>
Acked-by: Richard Guy Briggs <rgb@...hat.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
 arch/arm64/include/asm/ptrace.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index c7ba261..a429b59 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -135,6 +135,11 @@ struct pt_regs {
 #define user_stack_pointer(regs) \
 	(!compat_user_mode(regs)) ? ((regs)->sp) : ((regs)->compat_sp)
 
+static inline unsigned long regs_return_value(struct pt_regs *regs)
+{
+	return regs->regs[0];
+}
+
 /*
  * Are the current registers suitable for user mode? (used to maintain
  * security in signal handlers)
-- 
1.7.9.5

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