Re: [PATCH 3/4] perf, tools, script: Add support for printing assembler
From: Jiri Olsa
Date: Sun Mar 27 2016 - 07:05:21 EST
On Fri, Mar 25, 2016 at 04:02:37PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> When dumping PT traces with perf script it is very useful to see the
> assembler for each sample, so that it is easily possible to follow
> the control flow.
> As using objdump is difficult and inefficient from perf script this
> patch uses the udis86 library to implement assembler output.
> The library can be downloaded from http://udis86.sourceforge.net/
> The library is probed as an external dependency in the usual way. Then perf
> script calls into it when needed, and handles callbacks to resolve
> % perf record -e intel_pt//u true
> % perf script -F sym,symoff,ip,asm --itrace=i0ns | head
> 7fc7188b4190 _start+0x0 mov %rsp, %rdi
> 7fc7188b4193 _start+0x3 call _dl_start
> 7fc7188b7710 _dl_start+0x0 push %rbp
> 7fc7188b7711 _dl_start+0x1 mov %rsp, %rbp
> 7fc7188b7714 _dl_start+0x4 push %r15
> 7fc7188b7716 _dl_start+0x6 push %r14
> 7fc7188b7718 _dl_start+0x8 push %r13
> 7fc7188b771a _dl_start+0xa push %r12
> 7fc7188b771c _dl_start+0xc mov %rdi, %r12
> 7fc7188b771f _dl_start+0xf push %rbx
> Current issues:
> - Some jump references do not get resolved to symbols.
> - udis86 release does not support STAC/CLAC, which are used in the kernel,
> but there is a pending patch for it.
can't apply this on latest Arnaldo's tree:
patching file Documentation/perf-script.txt
patching file builtin-script.c
Hunk #5 succeeded at 431 (offset -2 lines).
Hunk #6 succeeded at 832 with fuzz 2 (offset -10 lines).
Hunk #7 FAILED at 871.
Hunk #8 succeeded at 890 with fuzz 2 (offset -10 lines).
Hunk #9 succeeded at 899 (offset -10 lines).
Hunk #10 FAILED at 1018.
Hunk #11 succeeded at 2108 (offset -10 lines).
2 out of 11 hunks FAILED -- saving rejects to file builtin-script.c.rej