[PATCH v6 3/4] arm64: Add regs_return_value() in syscall.h

[AKASHI Takahiro]

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 at arm.com>
Acked-by: Richard Guy Briggs <rgb at redhat.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.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