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    Subject[PATCH v4 1/3] arm64: Add regs_return_value() in syscall.h
    Date
    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.

    Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
    Acked-by Will Deacon <will.deacon@arm.com>
    ---
    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 0e7fa49..5800ec1 100644
    --- a/arch/arm64/include/asm/ptrace.h
    +++ b/arch/arm64/include/asm/ptrace.h
    @@ -134,6 +134,11 @@ struct pt_regs {
    #define user_stack_pointer(regs) \
    ((regs)->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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