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fpu_fstore.c revision 1.8 
      1 /*	$NetBSD: fpu_fstore.c,v 1.8 2003/07/15 02:43:10 lukem 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 1.8 2003/07/15 02:43:10 lukem 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(fe, insn)
     46      struct fpemu *fe;
     47      struct instruction *insn;
     48 {
     49     struct frame *frame = fe->fe_frame;
     50     u_int *fpregs = fe->fe_fpframe->fpf_regs;
     51     int word1, sig;
     52     int regnum;
     53     int format;
     54     u_int buf[3];
     55 
     56 #if DEBUG_FPE
     57     printf("  fpu_emul_fstore: frame at %p fpframe at %p\n",
     58 	   frame, fe->fe_fpframe);
     59 #endif
     60 
     61     word1 = insn->is_word1;
     62     format = (word1 >> 10) & 7;
     63     regnum = (word1 >> 7) & 7;
     64 
     65     insn->is_advance = 4;
     66 
     67     if (format == FTYPE_DBL) {
     68 	insn->is_datasize = 8;
     69     } else if (format == FTYPE_SNG || format == FTYPE_LNG) {
     70 	insn->is_datasize = 4;
     71     } else if (format == FTYPE_WRD) {
     72 	insn->is_datasize = 2;
     73 	format = FTYPE_LNG;
     74     } else if (format == FTYPE_BYT) {
     75 	insn->is_datasize = 1;
     76 	format = FTYPE_LNG;
     77     } else if (format == FTYPE_EXT) {
     78 	insn->is_datasize = 12;
     79     } else {
     80 	/* invalid or unsupported operand format */
     81 #if DEBUG_FPE
     82 	printf("  fpu_emul_fstore: invalid format %d\n", format);
     83 #endif
     84 	sig = SIGFPE;
     85     }
     86 #if DEBUG_FPE
     87     printf("  fpu_emul_fstore: format %d, size %d\n",
     88 	   format, insn->is_datasize);
     89 #endif
     90 
     91     fe->fe_fpsr &= ~FPSR_EXCP;
     92 
     93     /* Get effective address. (modreg=opcode&077) */
     94     sig = fpu_decode_ea(frame, insn, &insn->is_ea, insn->is_opcode);
     95     if (sig) {
     96 #if DEBUG_FPE
     97 	printf("  fpu_emul_fstore: failed in decode_ea sig=%d\n", sig);
     98 #endif
     99 	return sig;
    100     }
    101 
    102     if (insn->is_datasize > 4 && insn->is_ea.ea_flags == EA_DIRECT) {
    103 	/* trying to store dbl or ext into a data register */
    104 #ifdef DEBUG
    105 	printf("  fpu_fstore: attempted to store dbl/ext to reg\n");
    106 #endif
    107 	return SIGILL;
    108     }
    109 
    110 #if DEBUG_FPE
    111     printf("  fpu_emul_fstore: saving FP%d (%08x,%08x,%08x)\n",
    112 	   regnum, fpregs[regnum * 3], fpregs[regnum * 3 + 1],
    113 	   fpregs[regnum * 3 + 2]);
    114 #endif
    115     fpu_explode(fe, &fe->fe_f3, FTYPE_EXT, &fpregs[regnum * 3]);
    116 #if DEBUG_FPE
    117     {
    118 	static char *class_name[] = { "SNAN", "QNAN", "ZERO", "NUM", "INF" };
    119 	printf("  fpu_emul_fstore: fpn (%s,%c,%d,%08x,%08x,%08x)\n",
    120 	       class_name[fe->fe_f3.fp_class + 2],
    121 	       fe->fe_f3.fp_sign ? '-' : '+', fe->fe_f3.fp_exp,
    122 	       fe->fe_f3.fp_mant[0], fe->fe_f3.fp_mant[1],
    123 	       fe->fe_f3.fp_mant[2]);
    124     }
    125 #endif
    126     fpu_implode(fe, &fe->fe_f3, format, buf);
    127 
    128     fpu_store_ea(frame, insn, &insn->is_ea, (char *)buf);
    129 #if DEBUG_FPE
    130     printf("  fpu_emul_fstore: %08x,%08x,%08x size %d\n",
    131 	   buf[0], buf[1], buf[2], insn->is_datasize);
    132 #endif
    133 
    134     return 0;
    135 }
    136