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| author |   Brian Gerst <brgerst@gmail.com> | 2010-09-03 21:17:13 -0400 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@linux.intel.com> | 2010-09-09 14:16:58 -0700 |
| commit | 10c11f304986a1f84201c2261a428701f9d2dffc (patch) | |
| tree | 619bed49fcd50d6eec3034436ae77b5c3c46f7cb /arch/x86/kernel/i387.c | |
| parent | x86-64, fpu: Disable preemption when using TS_USEDFPU (diff) | |
| download | linux-dev-10c11f304986a1f84201c2261a428701f9d2dffc.tar.xz linux-dev-10c11f304986a1f84201c2261a428701f9d2dffc.zip | |
x86-64, fpu: Fix %cs value in convert_from_fxsr()
While %ds still contains the userspace selector, %cs is KERNEL_CS at
this point. Always get %cs from pt_regs even for the current task.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1283563039-3466-7-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/i387.c')
| -rw-r--r-- | arch/x86/kernel/i387.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 82166519497a..f3775f5ef4ab 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -389,19 +389,17 @@ convert_from_fxsr(struct user_i387_ia32_struct *env, struct task_struct *tsk) #ifdef CONFIG_X86_64 env->fip = fxsave->rip; env->foo = fxsave->rdp; + /* + * should be actually ds/cs at fpu exception time, but + * that information is not available in 64bit mode. + */ + env->fcs = task_pt_regs(tsk)->cs; if (tsk == current) { - /* - * should be actually ds/cs at fpu exception time, but - * that information is not available in 64bit mode. - */ - asm("mov %%ds, %[fos]" : [fos] "=r" (env->fos)); - asm("mov %%cs, %[fcs]" : [fcs] "=r" (env->fcs)); + savesegment(ds, env->fos); } else { - struct pt_regs *regs = task_pt_regs(tsk); - - env->fos = 0xffff0000 | tsk->thread.ds; - env->fcs = regs->cs; + env->fos = tsk->thread.ds; } + env->fos |= 0xffff0000; #else env->fip = fxsave->fip; env->fcs = (u16) fxsave->fcs | ((u32) fxsave->fop << 16); |