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fpu_fmovecr.c revision 1.9 
      1 /*	$NetBSD: fpu_fmovecr.c,v 1.9 2002/09/27 15:36:13 provos 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  * 3. Neither the name of the author nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)fpu_fmovecr.c	10/8/95
     32  */
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <machine/frame.h>
     37 
     38 #include "fpu_emulate.h"
     39 
     40 /* XXX: quick consistency check */
     41 #if (FP_1 != 0x40000)
     42 Error you have to change this table when changing the mantissa size
     43 #endif
     44 
     45 static struct fpn constrom[] = {
     46     /* fp_class, fp_sign, fp_exp, fp_sticky, fp_mant[0] ... [2] */
     47     { FPC_NUM, 0, 1, 0, { 0x6487e, 0xd5110b46, 0x11a80000 } },
     48     { FPC_NUM, 0, -2, 0, { 0x4d104, 0xd427de7f, 0xbcc00000 } },
     49     { FPC_NUM, 0, 1, 0, { 0x56fc2, 0xa2c515da, 0x54d00000 } },
     50     { FPC_NUM, 0, 0, 0, { 0x5c551, 0xd94ae0bf, 0x85e00000 } },
     51     { FPC_NUM, 0, -2, 0, { 0x6f2de, 0xc549b943, 0x8ca80000 } },
     52     { FPC_ZERO, 0, 0, 0, { 0x0, 0x0, 0x0 } },
     53     { FPC_NUM, 0, -1, 0, { 0x58b90, 0xbfbe8e7b, 0xcd600000 } },
     54     { FPC_NUM, 0, 1, 0, { 0x49aec, 0x6eed5545, 0x60b80000 } },
     55     { FPC_NUM, 0, 0, 0, { 0x40000, 0x0, 0x0 } },
     56     { FPC_NUM, 0, 3, 0, { 0x50000, 0x0, 0x0 } },
     57     { FPC_NUM, 0, 6, 0, { 0x64000, 0x0, 0x0 } },
     58     { FPC_NUM, 0, 13, 0, { 0x4e200, 0x0, 0x0 } },
     59     { FPC_NUM, 0, 26, 0, { 0x5f5e1, 0x0, 0x0 } },
     60     { FPC_NUM, 0, 53, 0, { 0x470de, 0x4df82000, 0x0 } },
     61     { FPC_NUM, 0, 106, 0, { 0x4ee2d, 0x6d415b85, 0xacf00000 } },
     62     { FPC_NUM, 0, 212, 0, { 0x613c0, 0xfa4ffe7d, 0x36a80000 } },
     63     { FPC_NUM, 0, 425, 0, { 0x49dd2, 0x3e4c074c, 0x67000000 } },
     64     { FPC_NUM, 0, 850, 0, { 0x553f7, 0x5fdcefce, 0xf4700000 } },
     65     { FPC_NUM, 0, 1700, 0, { 0x718cd, 0x5753074, 0x8e380000 } },
     66     { FPC_NUM, 0, 3401, 0, { 0x64bb3, 0xac340ba8, 0x60b80000 } },
     67     { FPC_NUM, 0, 6803, 0, { 0x4f459, 0xdaee29ea, 0xef280000 } },
     68     { FPC_NUM, 0, 13606, 0, { 0x62302, 0x90145104, 0xbcd80000 } },
     69 };
     70 
     71 struct fpn *
     72 fpu_const(fp, offset)
     73      struct fpn *fp;
     74      u_int offset;
     75 {
     76     struct fpn *r;
     77 
     78 #ifdef DEBUG
     79     if (fp == NULL) {
     80 	panic("fpu_const: NULL pointer passed");
     81     }
     82 #endif
     83     if (offset == 0) {
     84 	r = &constrom[0];
     85     } else if (0xb <= offset && offset <= 0xe) {
     86 	r = &constrom[offset - 0xb + 1];
     87     } else if (0x30 <= offset && offset <= 0x3f) {
     88 	r = &constrom[offset - 0x30 + 6];
     89     } else {
     90 	/* return 0.0 for anything else (incl. valid offset 0xf) */
     91 	r = &constrom[5];
     92     }
     93 
     94     CPYFPN(fp, r);
     95 
     96     return fp;
     97 }
     98 
     99 int
    100 fpu_emul_fmovecr(fe, insn)
    101      struct fpemu *fe;
    102      struct instruction *insn;
    103 {
    104     int dstreg, offset;
    105     u_int *fpreg;
    106 
    107     dstreg = (insn->is_word1 >> 7) & 0x7;
    108     offset = insn->is_word1 & 0x7F;
    109     fpreg = &(fe->fe_fpframe->fpf_regs[0]);
    110 
    111     (void)fpu_const(&fe->fe_f3, offset);
    112     (void)fpu_upd_fpsr(fe, &fe->fe_f3);
    113     fpu_implode(fe, &fe->fe_f3, FTYPE_EXT, &fpreg[dstreg * 3]);
    114 #if DEBUG_FPE
    115     printf("  fpu_emul_fmovecr: result %08x,%08x,%08x to FP%d\n",
    116 	   fpreg[dstreg * 3], fpreg[dstreg * 3 + 1], fpreg[dstreg * 3 + 2],
    117 	   dstreg);
    118 #endif
    119     return 0;
    120 }
    121