x86, xsave: save/restore the extended state context in sigframe

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / signal_64.c

diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c
index 47c3d249e638efdf72395cb2f269f8bcf63a5576..2621b98f5bf6635a5713bef4b0f3bbaf65ba4e41 100644 (file)
--- a/arch/x86/kernel/signal_64.c
+++ b/arch/x86/kernel/signal_64.c
@@ -53,7 +53,6 @@ sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
        return do_sigaltstack(uss, uoss, regs->sp);
 }
 
-
 /*
  * Do a signal return; undo the signal stack.
  */
@@ -98,25 +97,11 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
        {
                struct _fpstate __user * buf;
                err |= __get_user(buf, &sc->fpstate);
-
-               if (buf) {
-                       if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
-                               goto badframe;
-                       err |= restore_i387(buf);
-               } else {
-                       struct task_struct *me = current;
-                       if (used_math()) {
-                               clear_fpu(me);
-                               clear_used_math();
-                       }
-               }
+               err |= restore_i387_xstate(buf);
        }
 
        err |= __get_user(*pax, &sc->ax);
        return err;
-
-badframe:
-       return 1;
 }
 
 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
@@ -207,26 +192,26 @@ get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
                        sp = current->sas_ss_sp + current->sas_ss_size;
        }
 
-       return (void __user *)round_down(sp - size, 16);
+       return (void __user *)round_down(sp - size, 64);
 }
 
 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                           sigset_t *set, struct pt_regs * regs)
 {
        struct rt_sigframe __user *frame;
-       struct _fpstate __user *fp = NULL; 
+       void __user *fp = NULL;
        int err = 0;
        struct task_struct *me = current;
 
        if (used_math()) {
-               fp = get_stack(ka, regs, sizeof(struct _fpstate)); 
+               fp = get_stack(ka, regs, sig_xstate_size);
                frame = (void __user *)round_down(
                        (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
 
                if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
                        goto give_sigsegv;
 
-               if (save_i387(fp) < 0) 
+               if (save_i387_xstate(fp) < 0)
                        err |= -1; 
        } else
                frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
@@ -241,7 +226,10 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        }
                
        /* Create the ucontext.  */
-       err |= __put_user(0, &frame->uc.uc_flags);
+       if (cpu_has_xsave)
+               err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
+       else
+               err |= __put_user(0, &frame->uc.uc_flags);
        err |= __put_user(0, &frame->uc.uc_link);
        err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
        err |= __put_user(sas_ss_flags(regs->sp),