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Code Issues Releases Activity

Fix context restore bug.

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This commit is contained in:
David Xu 2002-11-22 03:01:55 +00:00
parent c2f7aa6939
commit 8773cd90dd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=107167
1 changed files with 16 additions and 10 deletions
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26
tools/KSE/ksetest/kse_asm.S
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@ -61,7 +61,7 @@ ENTRY(uts_to_thread)
je 2f
movl $-1, %eax /* bzzzt, invalid context */
jmp 5f
2: movl 8(%esp), %eax /* get address of curthreadp */
2: movl 8(%esp), %ecx /* get address of curthreadp */
movl %edx, %ebx /* save the pointer for later */
/*
* From here on, we don't touch the old stack.
@ -85,15 +85,21 @@ ENTRY(uts_to_thread)
jmp 4f
3: fninit
fldcw MC_FP_CW_OFFSET(%edx)
4: pushl 68(%edx) /* flags */
pushl 48(%edx) /* eax */
pushl 36(%edx) /* ebx */
movl 40(%edx), %edx /* edx */
movl %ebx, (%eax) /* <---- set new mailbox pointer */
popl %ebx
popl %eax
popf
5: ret
4: movl 48(%edx), %eax /* restore ax, bx, cx, dx */
pushl 68(%edx) /* flags on stack */
pushl 36(%edx) /* %ebx on stack */
pushl 44(%edx) /* %ecx on stack */
pushl 40(%edx) /* %edx on stack */
/*
* all registers are now moved out of mailbox
* it's now safe to set current thread pointer
*/
movl %ebx,(%ecx)
popl %edx /* %edx off stack */
popl %ecx /* %ecx off stack */
pop %ebx /* %ebx off stack */
popf /* flags off stack */
5: ret /* %eip off stack */
/*
* int thread_to_uts(struct kse_thr_mailbox *tm, struct kse_mailbox *km);