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Emulator Issues #8165

closed

Tools: Linux perf cannot disassemble JIT-compiled code

Added by flacs almost 10 years ago.

Status:
Fixed
Priority:
Low
Assignee:
-
% Done:

0%

Operating system:
N/A
Issue type:
Feature request
Milestone:
Regression:
No
Relates to usability:
No
Relates to performance:
No
Easy:
No
Relates to maintainability:
No
Regression start:
Fixed in:

Description

Even when Dolphin is started with "-P /tmp" to generate JIT symbols, perf still can't disassemble JIT-compiled code because it uses objdump for that which only looks at the executable on disk.

I hacked up a little workaround which should be re-done properly and either be merged upstream (Linux), added to our Tools/, or at least get documented somewhere:

$ cat disassemble.sh
#!/bin/bash
gdb -q -p $(pidof dolphin-emu) -ex "disas ${1##--start-address=},${2##--stop-address=}" -ex q -batch
$ dolphin-emu -P /tmp -b -e $game.iso &
$ perf top $(pidof dolphin-emu) --objdump ./disassemble.sh

This works but has a few issues:

  • gdb shows relative addresses for non-JIT functions, perf doesn't understand that
  • only supports the default disassembly mode of perf

I'll get to it when I have time but if someone else wants to work on this, please do.

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