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| author | davidxu <davidxu@FreeBSD.org> | 2002-11-22 11:43:06 +0000 |
|---|---|---|
| committer | davidxu <davidxu@FreeBSD.org> | 2002-11-22 11:43:06 +0000 |
| commit | ed0591ed98516f3316f0375f547836a22be09e9f (patch) | |
| tree | cd8200d6c38b101fe76cf17a065b8870c70d60f0 /lib/libkse | |
| parent | f89233ef8d826c7b28410899f4d41e455fd50311 (diff) | |
| download | FreeBSD-src-ed0591ed98516f3316f0375f547836a22be09e9f.zip FreeBSD-src-ed0591ed98516f3316f0375f547836a22be09e9f.tar.gz | |
In _thread_enter_uts, fix eflags saving bug.
In _thread_switch, set current thread pointer in kse mailbox
only after all registers copied out of thread mailbox, kernel will do
upcall at trap time, if set current thread pointer before loading all
registers from thread mailbox, at trap time, the thread mailbox data
will be overwritten by kernel, result is junk data is loaded into CPU.
Diffstat (limited to 'lib/libkse')
| -rw-r--r-- | lib/libkse/arch/i386/i386/thr_enter_uts.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/libkse/arch/i386/i386/thr_enter_uts.S b/lib/libkse/arch/i386/i386/thr_enter_uts.S index 8d38b0f..10edd3f 100644 --- a/lib/libkse/arch/i386/i386/thr_enter_uts.S +++ b/lib/libkse/arch/i386/i386/thr_enter_uts.S @@ -79,7 +79,8 @@ ENTRY(_thread_enter_uts) */ fnstcw MC_FP_CW_OFFSET(%edx) movl $0, MC_OWNEDFP_OFFSET(%edx) /* no FP */ - lahf /* get eflags */ + pushfl /* get eflags */ + popl %eax movl %eax, 68(%edx) /* store eflags */ movl %esp, %eax /* setcontext pushes the return */ addl $4, %eax /* address onto the top of the */ |
