Re: [PATCH v8 1/3] perf annotate: Show raw form for jump instruction with indirect target

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Mon, Dec 05, 2016 at 09:26:45PM +0530, Ravi Bangoria escreveu:
> For jump instructions that does not include target address as direct
> operand, show the original disassembled line for them. This is needed
> for certain powerpc jump instructions that use target address in a
> register (such as bctr, btar, ...).

Found it, .__bpf_prog_run, that is present in that perf.data file you
sent me, has it, will use it in my committer notes for this patch.

- Arnaldo

> 
> Before:
>      ld     r12,32088(r12)
>      mtctr  r12
>   v  bctr   ffffffffffffca2c
>      std    r2,24(r1)
>      addis  r12,r2,-1
> 
> After:
>      ld     r12,32088(r12)
>      mtctr  r12
>   v  bctr
>      std    r2,24(r1)
>      addis  r12,r2,-1
> 
> Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
> ---
> Changes in v8:
>   - v7: https://lkml.org/lkml/2016/9/21/436
>   - Rebase to acme/perf/core
>   - No logical changes. (Cross arch annotate patches are in. This patch
>     is for hardening annotate for powerpc.)
> 
>  tools/perf/util/annotate.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 4012b1d..ea7e0de 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -237,6 +237,9 @@ static int jump__parse(struct arch *arch __maybe_unused, struct ins_operands *op
>  static int jump__scnprintf(struct ins *ins, char *bf, size_t size,
>  			   struct ins_operands *ops)
>  {
> +	if (!ops->target.addr)
> +		return ins__raw_scnprintf(ins, bf, size, ops);
> +
>  	return scnprintf(bf, size, "%-6.6s %" PRIx64, ins->name, ops->target.offset);
>  }
>  
> -- 
> 2.4.11