release/src-rt-6.x.4708/linux/linux-2.6.36/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
  19 void 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
  61 void 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
 104 asmlinkage 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 }