/*
* High level FPU state handling functions:
*/
-extern void fpu__save(struct fpu *fpu);
extern int fpu__restore_sig(void __user *buf, int ia32_frame);
extern void fpu__drop(struct fpu *fpu);
-extern int fpu__copy(struct task_struct *dst, struct task_struct *src);
extern void fpu__clear_user_states(struct fpu *fpu);
extern void fpu__clear_all(struct fpu *fpu);
extern int fpu__exception_code(struct fpu *fpu, int trap_nr);
+extern void fpu_sync_fpstate(struct fpu *fpu);
+
+extern int fpu_clone(struct task_struct *dst);
+
/*
* Boot time FPU initialization functions:
*/
EXPORT_SYMBOL_GPL(kernel_fpu_end);
/*
- * Save the FPU state (mark it for reload if necessary):
- *
- * This only ever gets called for the current task.
+ * Sync the FPU register state to current's memory register state when the
+ * current task owns the FPU. The hardware register state is preserved.
*/
-void fpu__save(struct fpu *fpu)
+void fpu_sync_fpstate(struct fpu *fpu)
{
WARN_ON_FPU(fpu != ¤t->thread.fpu);
}
EXPORT_SYMBOL_GPL(fpstate_init);
-int fpu__copy(struct task_struct *dst, struct task_struct *src)
+/* Clone current's FPU state on fork */
+int fpu_clone(struct task_struct *dst)
{
+ struct fpu *src_fpu = ¤t->thread.fpu;
struct fpu *dst_fpu = &dst->thread.fpu;
- struct fpu *src_fpu = &src->thread.fpu;
+ /* The new task's FPU state cannot be valid in the hardware. */
dst_fpu->last_cpu = -1;
- if (!static_cpu_has(X86_FEATURE_FPU))
+ if (!cpu_feature_enabled(X86_FEATURE_FPU))
return 0;
- WARN_ON_FPU(src_fpu != ¤t->thread.fpu);
-
/*
* Don't let 'init optimized' areas of the XSAVE area
* leak into the child task:
}
/*
- * Save the info for the exception handler and clear the error.
+ * Synchronize the FPU register state to the memory register state
+ * if necessary. This allows the exception handler to inspect it.
*/
- fpu__save(fpu);
+ fpu_sync_fpstate(fpu);
task->thread.trap_nr = trapnr;
task->thread.error_code = 0;