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Bug 22664 – Disassembler mistakes rdtscp for invlpg ECX

Status: RESOLVED
Resolution: FIXED
Severity: normal
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: x86_64
OS: Linux
Creation time: 2022-01-11T00:11:31Z
Last change time: 2022-05-21T06:50:30Z
Keywords: disassembler, pull
Assigned to: No Owner
Creator: mhh

Comments

Comment #0 by maxhaton — 2022-01-11T00:11:31Z

dmd vasm gives ``` simpleLoop: 0000: 0F 01 F9 invlpg ECX ``` GNU objdump gives ``` 0000000000000000 <simpleLoop>: 0: 0f 01 f9 rdtscp ... ``` Note that this is the wrong type of operand for invlpg too (should be an mm64), luckily however when the instruction is decoded as a true positive (i.e. the source bytes really are a invlpg) the correct operand is given.

Comment #1 by dlang-bot — 2022-05-21T00:53:55Z

@maxhaton created dlang/dmd pull request #14153 "Fix Issue 22664 - -vasm doesn't recognize rdtscp" fixing this issue: - Fix Issue 22664 - -vasm doesn't recognize rdtscp https://github.com/dlang/dmd/pull/14153

Comment #2 by dlang-bot — 2022-05-21T06:50:30Z

dlang/dmd pull request #14153 "Fix Issue 22664 - -vasm doesn't recognize rdtscp" was merged into master: - fa2baf85c86e02834836982d14eadf52cd4bf0b7 by mhh: Fix Issue 22664 - -vasm doesn't recognize rdtscp https://github.com/dlang/dmd/pull/14153