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x86:ensure that getcontext will return 0.

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The setcontext method did not alway set the return value to 0 after
restoring the desired context. Specially When calling setcontext with
the _UC_IGNSIGM and the _UC_IGNFPU flags the return value would be non
zero.

Change-Id: Iec7f8d6a680950aa53e3c88c86e03f65005e66b2
This commit is contained in:
Kees Jongenburger 2014-03-24 16:16:21 +01:00 committed by Lionel Sambuc
parent 372247712a
commit 69b8ce6ab2
1 changed files with 1 additions and 0 deletions
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lib/libc/arch/i386/sys-minix/ucontext.S
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@ -108,6 +108,7 @@ ENTRY(setcontext)
mov SI(%edx), %esi /* Restore ESI */ mov SI(%edx), %esi /* Restore ESI */
mov BP(%edx), %ebp /* Restore EBP */ mov BP(%edx), %ebp /* Restore EBP */
mov SP(%edx), %esp /* Restore stack pointer */ mov SP(%edx), %esp /* Restore stack pointer */
xor %eax, %eax /* Return 0 */
jmp *PC(%edx) /* Return to RTA */ jmp *PC(%edx) /* Return to RTA */
/* void ctx_start((void *func)(int arg1, ..., argn), arg1, ..., argn, /* void ctx_start((void *func)(int arg1, ..., argn), arg1, ..., argn,