https://bugs.kde.org/show_bug.cgi?id=447995
Bug ID: 447995
Summary: Valgrind segfault on power10 due to hwcap checking
code
Product: valgrind
Version: unspecified
Platform: unspecified
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: will_schm...@vnet.ibm.com
Target Milestone: ---
Created attachment 145143
--> https://bugs.kde.org/attachment.cgi?id=145143&action=edit
proposed patch to add clobber masks to inline asm statements
SUMMARY
***
On a Power10-based server, valgrind segfaults during initialization.
(Problem found by Tulio, investigated by Tulio and Will).
After some debug we found out that r20 is being clobbered at
coregrind/m_machine.c:1417:
__asm__ __volatile__(".long 0x7f1401b6"); /* brh RA, RS */
Preliminary patch to add clobber options to the asm stanzas is attached.
***
STEPS TO REPRODUCE
1. Run valgrind on a power10
2. observe segfault early in valgrind startup
3.
OBSERVED RESULT
segfault
EXPECTED RESULT
no segfault
SOFTWARE/OS VERSIONS
Linux on Powerpc / power10
ADDITIONAL INFORMATION
This problem has only been seen on power10, and occurs due to an instruction
only exercised on power10. But, there is potential for some of the other
inline asm to have similar side affects. Patch should address these.
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