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libc:x86 fix for get and setcontext assembly calls.

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The get and set context calls where wrongly assuming that the value
of arguments passed on the stack where kept unmodified.

Change-Id: I779b08d7f5a6472c5e9dc351ae44abb2acafb3bd
This commit is contained in:
Kees Jongenburger 2014-04-02 09:28:38 +02:00 committed by Lionel Sambuc
parent 69b8ce6ab2
commit 8991ca4e5a
1 changed files with 8 additions and 4 deletions
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12
lib/libc/arch/i386/sys-minix/ucontext.S
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@ -34,9 +34,11 @@ ENTRY(_getcontext)
cmp $[_UC_IGNFPU|_UC_IGNSIGM], %eax
jz 5f /* Ignore both, skip getuctx */
PIC_PROLOGUE
push %edx
push %edx /* push a copy for us */
push %edx /* push a copy as function argument */
call PIC_PLT(_C_LABEL(getuctx)) /* getuctx(ucp) */
pop %edx /* clean up stack and restore edx */
pop %edx /* clean up stack */
pop %edx /* clean up stack and restore edx */
PIC_EPILOGUE
5:
@ -96,9 +98,11 @@ ENTRY(setcontext)
* state and signal mask */
PIC_PROLOGUE
push %edx
push %edx /* push a copy for us */
push %edx /* push a copy as function argument */
call PIC_PLT(_C_LABEL(setuctx)) /* setuctx(ucp) */
pop %edx /* Clean up stack and restore edx */
pop %edx /* clean up stack */
pop %edx /* clean up stack and restore edx */
PIC_EPILOGUE
5: /* Restore the registers (except EAX and EDX) */