sys/arch/m68k/fpe/fpu_fstore.c

   1 /*      $NetBSD: fpu_fstore.c,v 1.10 2007/03/09 16:23:01 tsutsui Exp $  */
   2
   3 /*
   4  * Copyright (c) 1995 Ken Nakata
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __KERNEL_RCSID(0, "$NetBSD: fpu_fstore.c,v 1.10 2007/03/09 16:23:01 tsutsui Exp $");
  30
  31 #include <sys/types.h>
  32 #include <sys/signal.h>
  33 #include <sys/systm.h>
  34 #include <machine/frame.h>
  35
  36 #include "fpu_emulate.h"
  37
  38 /*
  39  * type 0: fmove mem/fpr->fpr
  40  * In this function, we know
  41  *      (opcode & 0x01c0) == 0
  42  *      (word1 & 0xe000) == 0x6000
  43  */
  44 int
  45 fpu_emul_fstore(struct fpemu *fe, struct instruction *insn)
  46 {
  47     struct frame *frame = fe->fe_frame;
  48     u_int *fpregs = fe->fe_fpframe->fpf_regs;
  49     int word1, sig;
  50     int regnum;
  51     int format;
  52     u_int buf[3];
  53
  54 #if DEBUG_FPE
  55     printf("  fpu_emul_fstore: frame at %p fpframe at %p\n",
  56            frame, fe->fe_fpframe);
  57 #endif
  58
  59     word1 = insn->is_word1;
  60     format = (word1 >> 10) & 7;
  61     regnum = (word1 >> 7) & 7;
  62
  63     insn->is_advance = 4;
  64
  65     if (format == FTYPE_DBL) {
  66         insn->is_datasize = 8;
  67     } else if (format == FTYPE_SNG || format == FTYPE_LNG) {
  68         insn->is_datasize = 4;
  69     } else if (format == FTYPE_WRD) {
  70         insn->is_datasize = 2;
  71         format = FTYPE_LNG;
  72     } else if (format == FTYPE_BYT) {
  73         insn->is_datasize = 1;
  74         format = FTYPE_LNG;
  75     } else if (format == FTYPE_EXT) {
  76         insn->is_datasize = 12;
  77     } else {
  78         /* invalid or unsupported operand format */
  79 #if DEBUG_FPE
  80         printf("  fpu_emul_fstore: invalid format %d\n", format);
  81 #endif
  82         sig = SIGFPE;
  83     }
  84 #if DEBUG_FPE
  85     printf("  fpu_emul_fstore: format %d, size %d\n",
  86            format, insn->is_datasize);
  87 #endif
  88
  89     fe->fe_fpsr &= ~FPSR_EXCP;
  90
  91     /* Get effective address. (modreg=opcode&077) */
  92     sig = fpu_decode_ea(frame, insn, &insn->is_ea, insn->is_opcode);
  93     if (sig) {
  94 #if DEBUG_FPE
  95         printf("  fpu_emul_fstore: failed in decode_ea sig=%d\n", sig);
  96 #endif
  97         return sig;
  98     }
  99
 100     if (insn->is_datasize > 4 && insn->is_ea.ea_flags == EA_DIRECT) {
 101         /* trying to store dbl or ext into a data register */
 102 #ifdef DEBUG
 103         printf("  fpu_fstore: attempted to store dbl/ext to reg\n");
 104 #endif
 105         return SIGILL;
 106     }
 107
 108 #if DEBUG_FPE
 109     printf("  fpu_emul_fstore: saving FP%d (%08x,%08x,%08x)\n",
 110            regnum, fpregs[regnum * 3], fpregs[regnum * 3 + 1],
 111            fpregs[regnum * 3 + 2]);
 112 #endif
 113     fpu_explode(fe, &fe->fe_f3, FTYPE_EXT, &fpregs[regnum * 3]);
 114 #if DEBUG_FPE
 115     {
 116         static const char *class_name[] =
 117             { "SNAN", "QNAN", "ZERO", "NUM", "INF" };
 118         printf("  fpu_emul_fstore: fpn (%s,%c,%d,%08x,%08x,%08x)\n",
 119                class_name[fe->fe_f3.fp_class + 2],
 120                fe->fe_f3.fp_sign ? '-' : '+', fe->fe_f3.fp_exp,
 121                fe->fe_f3.fp_mant[0], fe->fe_f3.fp_mant[1],
 122                fe->fe_f3.fp_mant[2]);
 123     }
 124 #endif
 125     fpu_implode(fe, &fe->fe_f3, format, buf);
 126
 127     fpu_store_ea(frame, insn, &insn->is_ea, (char *)buf);
 128 #if DEBUG_FPE
 129     printf("  fpu_emul_fstore: %08x,%08x,%08x size %d\n",
 130            buf[0], buf[1], buf[2], insn->is_datasize);
 131 #endif
 132
 133     return 0;
 134 }