https://bugs.kde.org/show_bug.cgi?id=493003
Bug ID: 493003
Summary: amd64: Support cmps repnz prefix and non-repeating
cases
Classification: Developer tools
Product: valgrind
Version: 3.23 GIT
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: cont...@mborgerson.com
Target Milestone: ---
Created attachment 173576
--> https://bugs.kde.org/attachment.cgi?id=173576&action=edit
Patch
SUMMARY
Attached patch adds support for repnz prefix, which is another encoding for rep
cmps, and the case where there is no rep prefix for a cmps instruction.
Closes 253436, 340469, 406132
STEPS TO REPRODUCE
Build and run
https://github.com/qemu/qemu/blob/master/tests/tcg/i386/test-i386.c
OBSERVED RESULT
Crash when these instructions are encountered.
EXPECTED RESULT
cmps should work with the repnz prefix, and without a rep prefix.
SOFTWARE/OS VERSIONS
Valgrind: VALGRIND_3_23_0-108-g5d404b97d
ADDITIONAL INFORMATION
Discovered via QEMU differential tests. A version of these tests, with these
particular cases commented out, are in Valgrind at /VEX/test/test-amd64.c, but
the test in Valgrind repo does not compile.
--
You are receiving this mail because:
You are watching all bug changes.
