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SubjectRe: [PATCH v7 6/7] arm64: ftrace: Add CALLER_ADDRx macros
On Sat, Mar 15, 2014 at 05:45:52AM +0000, AKASHI Takahiro wrote:
> CALLER_ADDRx returns caller's address at specified level in call stacks.
> They are used for several tracers like irqsoff and preemptoff.
> Strange to say, however, they are refered even without FTRACE.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> ---
> arch/arm64/include/asm/ftrace.h | 13 ++++++++-
> arch/arm64/kernel/Makefile | 3 ++-
> arch/arm64/kernel/return_address.c | 55 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 69 insertions(+), 2 deletions(-)
> create mode 100644 arch/arm64/kernel/return_address.c
>
> diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h
> index ed5c448..c44c4b1 100644
> --- a/arch/arm64/include/asm/ftrace.h
> +++ b/arch/arm64/include/asm/ftrace.h
> @@ -18,6 +18,7 @@
>
> #ifndef __ASSEMBLY__
> extern void _mcount(unsigned long);
> +extern void *return_address(unsigned int);
>
> struct dyn_arch_ftrace {
> /* No extra data needed for arm64 */
> @@ -33,6 +34,16 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
> */
> return addr;
> }
> -#endif /* __ASSEMBLY__ */
> +
> +#define HAVE_ARCH_CALLER_ADDR
> +
> +#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> +#define CALLER_ADDR1 ((unsigned long)return_address(1))
> +#define CALLER_ADDR2 ((unsigned long)return_address(2))
> +#define CALLER_ADDR3 ((unsigned long)return_address(3))
> +#define CALLER_ADDR4 ((unsigned long)return_address(4))
> +#define CALLER_ADDR5 ((unsigned long)return_address(5))
> +#define CALLER_ADDR6 ((unsigned long)return_address(6))
> +#endif /* ifndef __ASSEMBLY__ */

Hmm, I thought you were going to take a look at reworking the core code for
this, as Steve and I suggested?

http://lists.infradead.org/pipermail/linux-arm-kernel/2014-March/240239.html

Will

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