1/*	$NetBSD: fpu_fstore.c,v 1.12 2011/07/18 07:44:30 isaki 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 1.12 2011/07/18 07:44:30 isaki 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 */
44int
45fpu_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}
135