LXR linux/arch/sh/kernel/cpu/sh5/fpu.c

   1/*
   2 * arch/sh/kernel/cpu/sh5/fpu.c
   3 *
   4 * Copyright (C) 2001  Manuela Cirronis, Paolo Alberelli
   5 * Copyright (C) 2002  STMicroelectronics Limited
   6 *   Author : Stuart Menefy
   7 *
   8 * Started from SH4 version:
   9 *   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
  10 *
  11 * This file is subject to the terms and conditions of the GNU General Public
  12 * License.  See the file "COPYING" in the main directory of this archive
  13 * for more details.
  14 */
  15#include <linux/sched.h>
  16#include <linux/signal.h>
  17#include <asm/processor.h>
  18
  19void save_fpu(struct task_struct *tsk)
  20{
  21        asm volatile("fst.p     %0, (0*8), fp0\n\t"
  22                     "fst.p     %0, (1*8), fp2\n\t"
  23                     "fst.p     %0, (2*8), fp4\n\t"
  24                     "fst.p     %0, (3*8), fp6\n\t"
  25                     "fst.p     %0, (4*8), fp8\n\t"
  26                     "fst.p     %0, (5*8), fp10\n\t"
  27                     "fst.p     %0, (6*8), fp12\n\t"
  28                     "fst.p     %0, (7*8), fp14\n\t"
  29                     "fst.p     %0, (8*8), fp16\n\t"
  30                     "fst.p     %0, (9*8), fp18\n\t"
  31                     "fst.p     %0, (10*8), fp20\n\t"
  32                     "fst.p     %0, (11*8), fp22\n\t"
  33                     "fst.p     %0, (12*8), fp24\n\t"
  34                     "fst.p     %0, (13*8), fp26\n\t"
  35                     "fst.p     %0, (14*8), fp28\n\t"
  36                     "fst.p     %0, (15*8), fp30\n\t"
  37                     "fst.p     %0, (16*8), fp32\n\t"
  38                     "fst.p     %0, (17*8), fp34\n\t"
  39                     "fst.p     %0, (18*8), fp36\n\t"
  40                     "fst.p     %0, (19*8), fp38\n\t"
  41                     "fst.p     %0, (20*8), fp40\n\t"
  42                     "fst.p     %0, (21*8), fp42\n\t"
  43                     "fst.p     %0, (22*8), fp44\n\t"
  44                     "fst.p     %0, (23*8), fp46\n\t"
  45                     "fst.p     %0, (24*8), fp48\n\t"
  46                     "fst.p     %0, (25*8), fp50\n\t"
  47                     "fst.p     %0, (26*8), fp52\n\t"
  48                     "fst.p     %0, (27*8), fp54\n\t"
  49                     "fst.p     %0, (28*8), fp56\n\t"
  50                     "fst.p     %0, (29*8), fp58\n\t"
  51                     "fst.p     %0, (30*8), fp60\n\t"
  52                     "fst.p     %0, (31*8), fp62\n\t"
  53
  54                     "fgetscr   fr63\n\t"
  55                     "fst.s     %0, (32*8), fr63\n\t"
  56                : /* no output */
  57                : "r" (&tsk->thread.xstate->hardfpu)
  58                : "memory");
  59}
  60
  61void restore_fpu(struct task_struct *tsk)
  62{
  63        asm volatile("fld.p     %0, (0*8), fp0\n\t"
  64                     "fld.p     %0, (1*8), fp2\n\t"
  65                     "fld.p     %0, (2*8), fp4\n\t"
  66                     "fld.p     %0, (3*8), fp6\n\t"
  67                     "fld.p     %0, (4*8), fp8\n\t"
  68                     "fld.p     %0, (5*8), fp10\n\t"
  69                     "fld.p     %0, (6*8), fp12\n\t"
  70                     "fld.p     %0, (7*8), fp14\n\t"
  71                     "fld.p     %0, (8*8), fp16\n\t"
  72                     "fld.p     %0, (9*8), fp18\n\t"
  73                     "fld.p     %0, (10*8), fp20\n\t"
  74                     "fld.p     %0, (11*8), fp22\n\t"
  75                     "fld.p     %0, (12*8), fp24\n\t"
  76                     "fld.p     %0, (13*8), fp26\n\t"
  77                     "fld.p     %0, (14*8), fp28\n\t"
  78                     "fld.p     %0, (15*8), fp30\n\t"
  79                     "fld.p     %0, (16*8), fp32\n\t"
  80                     "fld.p     %0, (17*8), fp34\n\t"
  81                     "fld.p     %0, (18*8), fp36\n\t"
  82                     "fld.p     %0, (19*8), fp38\n\t"
  83                     "fld.p     %0, (20*8), fp40\n\t"
  84                     "fld.p     %0, (21*8), fp42\n\t"
  85                     "fld.p     %0, (22*8), fp44\n\t"
  86                     "fld.p     %0, (23*8), fp46\n\t"
  87                     "fld.p     %0, (24*8), fp48\n\t"
  88                     "fld.p     %0, (25*8), fp50\n\t"
  89                     "fld.p     %0, (26*8), fp52\n\t"
  90                     "fld.p     %0, (27*8), fp54\n\t"
  91                     "fld.p     %0, (28*8), fp56\n\t"
  92                     "fld.p     %0, (29*8), fp58\n\t"
  93                     "fld.p     %0, (30*8), fp60\n\t"
  94
  95                     "fld.s     %0, (32*8), fr63\n\t"
  96                     "fputscr   fr63\n\t"
  97
  98                     "fld.p     %0, (31*8), fp62\n\t"
  99                : /* no output */
 100                : "r" (&tsk->thread.xstate->hardfpu)
 101                : "memory");
 102}
 103
 104asmlinkage void do_fpu_error(unsigned long ex, struct pt_regs *regs)
 105{
 106        struct task_struct *tsk = current;
 107
 108        regs->pc += 4;
 109
 110        tsk->thread.trap_no = 11;
 111        tsk->thread.error_code = 0;
 112
 113        force_sig(SIGFPE, tsk);
 114}
 115