Annotation of sys/arch/m68k/fpe/fpu_fstore.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: fpu_fstore.c,v 1.6 2006/06/11 20:43:28 miod Exp $ */
2: /* $NetBSD: fpu_fstore.c,v 1.8 2003/07/15 02:43:10 lukem Exp $ */
3:
4: /*
5: * Copyright (c) 1995 Ken Nakata
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27: */
28:
29: #include <sys/types.h>
30: #include <sys/signal.h>
31: #include <sys/systm.h>
32: #include <machine/frame.h>
33:
34: #include <m68k/fpe/fpu_emulate.h>
35:
36: /*
37: * type 0: fmove mem/fpr->fpr
38: * In this function, we know
39: * (opcode & 0x01c0) == 0
40: * (word1 & 0xe000) == 0x6000
41: */
42: int
43: fpu_emul_fstore(struct fpemu *fe, struct instruction *insn, int *typ)
44: {
45: struct frame *frame = fe->fe_frame;
46: u_int *fpregs = fe->fe_fpframe->fpf_regs;
47: int word1, sig;
48: int regnum;
49: int format;
50: u_int buf[3];
51:
52: #if DEBUG_FPE
53: printf(" fpu_emul_fstore: frame at %p fpframe at %p\n",
54: frame, fe->fe_fpframe);
55: #endif
56:
57: word1 = insn->is_word1;
58: format = (word1 >> 10) & 7;
59: regnum = (word1 >> 7) & 7;
60:
61: insn->is_advance = 4;
62:
63: if (format == FTYPE_DBL) {
64: insn->is_datasize = 8;
65: } else if (format == FTYPE_SNG || format == FTYPE_LNG) {
66: insn->is_datasize = 4;
67: } else if (format == FTYPE_WRD) {
68: insn->is_datasize = 2;
69: format = FTYPE_LNG;
70: } else if (format == FTYPE_BYT) {
71: insn->is_datasize = 1;
72: format = FTYPE_LNG;
73: } else if (format == FTYPE_EXT) {
74: insn->is_datasize = 12;
75: } else {
76: /* invalid or unsupported operand format */
77: #if DEBUG_FPE
78: printf(" fpu_emul_fstore: invalid format %d\n", format);
79: #endif
80: *typ = ILL_ILLOPN;
81: sig = SIGILL;
82: }
83: #if DEBUG_FPE
84: printf(" fpu_emul_fstore: format %d, size %d\n",
85: format, insn->is_datasize);
86: #endif
87:
88: fe->fe_fpsr &= ~FPSR_EXCP;
89:
90: /* Get effective address. (modreg=opcode&077) */
91: sig = fpu_decode_ea(frame, insn, &insn->is_ea, insn->is_opcode, typ);
92: if (sig) {
93: #if DEBUG_FPE
94: printf(" fpu_emul_fstore: failed in decode_ea sig=%d\n", sig);
95: #endif
96: return sig;
97: }
98:
99: if (insn->is_datasize > 4 && insn->is_ea.ea_flags == EA_DIRECT) {
100: /* trying to store dbl or ext into a data register */
101: #ifdef DEBUG
102: printf(" fpu_fstore: attempted to store dbl/ext to reg\n");
103: #endif
104: return SIGILL;
105: }
106:
107: #if DEBUG_FPE
108: printf(" fpu_emul_fstore: saving FP%d (%08x,%08x,%08x)\n",
109: regnum, fpregs[regnum * 3], fpregs[regnum * 3 + 1],
110: fpregs[regnum * 3 + 2]);
111: #endif
112: fpu_explode(fe, &fe->fe_f3, FTYPE_EXT, &fpregs[regnum * 3]);
113: #if DEBUG_FPE
114: {
115: static char *class_name[] = { "SNAN", "QNAN", "ZERO", "NUM", "INF" };
116: printf(" fpu_emul_fstore: fpn (%s,%c,%d,%08x,%08x,%08x)\n",
117: class_name[fe->fe_f3.fp_class + 2],
118: fe->fe_f3.fp_sign ? '-' : '+', fe->fe_f3.fp_exp,
119: fe->fe_f3.fp_mant[0], fe->fe_f3.fp_mant[1],
120: fe->fe_f3.fp_mant[2]);
121: }
122: #endif
123: fpu_implode(fe, &fe->fe_f3, format, buf);
124:
125: fpu_store_ea(frame, insn, &insn->is_ea, (char *)buf);
126: #if DEBUG_FPE
127: printf(" fpu_emul_fstore: %08x,%08x,%08x size %d\n",
128: buf[0], buf[1], buf[2], insn->is_datasize);
129: #endif
130:
131: return 0;
132: }
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