1 files changed, 53 insertions, 0 deletions

diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c
index 47c3d249e638..b45ef8ddd651 100644
--- a/arch/x86/kernel/signal_64.c
+++ b/arch/x86/kernel/signal_64.c
@@ -53,6 +53,59 @@ sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
         return do_sigaltstack(uss, uoss, regs->sp);
 }
 
+/*
+ * Signal frame handlers.
+ */
+
+static inline int save_i387(struct _fpstate __user *buf)
+{
+        struct task_struct *tsk = current;
+        int err = 0;
+
+        BUILD_BUG_ON(sizeof(struct user_i387_struct) !=
+                        sizeof(tsk->thread.xstate->fxsave));
+
+        if ((unsigned long)buf % 16)
+                printk("save_i387: bad fpstate %p\n", buf);
+
+        if (!used_math())
+                return 0;
+        clear_used_math(); /* trigger finit */
+        if (task_thread_info(tsk)->status & TS_USEDFPU) {
+                err = save_i387_checking((struct i387_fxsave_struct __user *)
+                                         buf);
+                if (err)
+                        return err;
+                task_thread_info(tsk)->status &= ~TS_USEDFPU;
+                stts();
+        } else {
+                if (__copy_to_user(buf, &tsk->thread.xstate->fxsave,
+                                   sizeof(struct i387_fxsave_struct)))
+                        return -1;
+        }
+        return 1;
+}
+
+/*
+ * This restores directly out of user space. Exceptions are handled.
+ */
+static inline int restore_i387(struct _fpstate __user *buf)
+{
+        struct task_struct *tsk = current;
+        int err;
+
+        if (!used_math()) {
+                err = init_fpu(tsk);
+                if (err)
+                        return err;
+        }
+
+        if (!(task_thread_info(current)->status & TS_USEDFPU)) {
+                clts();
+                task_thread_info(current)->status |= TS_USEDFPU;
+        }
+        return restore_fpu_checking((__force struct i387_fxsave_struct *)buf);
+}
 
 /*
  * Do a signal return; undo the signal stack.