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| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-04-29 14:07:49 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-29 14:13:16 -0700 |
| commit | 543f2a3382bd7abd7380903518c61f00c7c87577 (patch) | |
| tree | ca6dff499b29f40b5ff62aaaed48def6e4c81016 | |
| parent | 693f7d362055261882659475d2ef022e32edbff1 (diff) | |
| download | op-kernel-dev-543f2a3382bd7abd7380903518c61f00c7c87577.zip op-kernel-dev-543f2a3382bd7abd7380903518c61f00c7c87577.tar.gz | |
[PATCH] i386: fix broken FP exception handling
The FXSAVE information leak patch introduced a bug in FP exception
handling: it clears FP exceptions only when there are already
none outstanding. Mikael Pettersson reported that causes problems
with the Erlang runtime and has tested this fix.
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | include/asm-i386/i387.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-i386/i387.h b/include/asm-i386/i387.h index 7b1f011..bc1d6ed 100644 --- a/include/asm-i386/i387.h +++ b/include/asm-i386/i387.h @@ -58,13 +58,13 @@ static inline void __save_init_fpu( struct task_struct *tsk ) alternative_input( "fnsave %[fx] ;fwait;" GENERIC_NOP8 GENERIC_NOP4, "fxsave %[fx]\n" - "bt $7,%[fsw] ; jc 1f ; fnclex\n1:", + "bt $7,%[fsw] ; jnc 1f ; fnclex\n1:", X86_FEATURE_FXSR, [fx] "m" (tsk->thread.i387.fxsave), [fsw] "m" (tsk->thread.i387.fxsave.swd) : "memory"); /* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception is pending. Clear the x87 state here by setting it to fixed - values. __per_cpu_offset[0] is a random variable that should be in L1 */ + values. safe_address is a random variable that should be in L1 */ alternative_input( GENERIC_NOP8 GENERIC_NOP2, "emms\n\t" /* clear stack tags */ |
