[patch] fastcall-2.3.32-B7, SYSENTER/SYSEXIT support

Ingo Molnar (mingo@chiara.csoma.elte.hu)
Fri, 10 Dec 1999 14:04:38 +0100 (CET)


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--79888902-983796663-944831078=:4050
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there were two bugs in B6, the stack frame got shifted which resulted in
corrupted registers, plus 'cld' has to be done after saving user-space
flags. (tested patch against 2.3.32-pre2 attached) With these fixed it
works just fine with Artur's LD_PRELOAD library:

int $80:

moon:~/ldp> ./lat_syscall null
Simple syscall: 0.2817 microseconds

fastcall:

moon:~/ldp> ./lat_syscall null
Simple syscall: 0.5450 microseconds

-- mingo

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