xref: /src/sys/arch/m68k/fpe/fpu_fmovecr.c

/*	$NetBSD: fpu_fmovecr.c,v 1.16 2013/03/26 11:30:20 isaki Exp $	*/

/*
 * Copyright (c) 1995  Ken Nakata
 *	All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)fpu_fmovecr.c	10/8/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fpu_fmovecr.c,v 1.16 2013/03/26 11:30:20 isaki Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <machine/frame.h>

#include "fpu_emulate.h"

/* XXX: quick consistency check */
#if (FP_1 != 0x40000)
#error you have to change this table when changing the mantissa size
#endif

static struct fpn constrom[] = {
	/* fp_class, fp_sign, fp_exp, fp_sticky, fp_mant[0] ... [2] */
	{ FPC_NUM, 0, 1, 0, { 0x6487e, 0xd5110b46, 0x11a80000 } },
	{ FPC_NUM, 0, -2, 0, { 0x4d104, 0xd427de7f, 0xbcc00000 } },
	{ FPC_NUM, 0, 1, 0, { 0x56fc2, 0xa2c515da, 0x54d00000 } },
	{ FPC_NUM, 0, 0, 0, { 0x5c551, 0xd94ae0bf, 0x85e00000 } },
	{ FPC_NUM, 0, -2, 0, { 0x6f2de, 0xc549b943, 0x8ca80000 } },
	{ FPC_ZERO, 0, 0, 0, { 0x0, 0x0, 0x0 } },
	{ FPC_NUM, 0, -1, 0, { 0x58b90, 0xbfbe8e7b, 0xcd600000 } },
	{ FPC_NUM, 0, 1, 0, { 0x49aec, 0x6eed5545, 0x60b80000 } },
	{ FPC_NUM, 0, 0, 0, { 0x40000, 0x0, 0x0 } },
	{ FPC_NUM, 0, 3, 0, { 0x50000, 0x0, 0x0 } },
	{ FPC_NUM, 0, 6, 0, { 0x64000, 0x0, 0x0 } },
	{ FPC_NUM, 0, 13, 0, { 0x4e200, 0x0, 0x0 } },
	{ FPC_NUM, 0, 26, 0, { 0x5f5e1, 0x0, 0x0 } },
	{ FPC_NUM, 0, 53, 0, { 0x470de, 0x4df82000, 0x0 } },
	{ FPC_NUM, 0, 106, 0, { 0x4ee2d, 0x6d415b85, 0xacf00000 } },
	{ FPC_NUM, 0, 212, 0, { 0x613c0, 0xfa4ffe7d, 0x36a80000 } },
	{ FPC_NUM, 0, 425, 0, { 0x49dd2, 0x3e4c074c, 0x67000000 } },
	{ FPC_NUM, 0, 850, 0, { 0x553f7, 0x5fdcefce, 0xf4700000 } },
	{ FPC_NUM, 0, 1700, 0, { 0x718cd, 0x5753074, 0x8e380000 } },
	{ FPC_NUM, 0, 3401, 0, { 0x64bb3, 0xac340ba8, 0x60b80000 } },
	{ FPC_NUM, 0, 6803, 0, { 0x4f459, 0xdaee29ea, 0xef280000 } },
	{ FPC_NUM, 0, 13606, 0, { 0x62302, 0x90145104, 0xbcd80000 } },
};

struct fpn *
fpu_const(struct fpn *fp, uint32_t offset)
{
	struct fpn *r;

#ifdef DEBUG
	if (fp == NULL) {
		panic("fpu_const: NULL pointer passed");
	}
#endif
	if (offset == 0) {
		r = &constrom[0];
	} else if (0xb <= offset && offset <= 0xe) {
		r = &constrom[offset - 0xb + 1];
	} else if (0x30 <= offset && offset <= 0x3f) {
		r = &constrom[offset - 0x30 + 6];
	} else {
		/* return 0.0 for anything else (incl. valid offset 0xf) */
		r = &constrom[5];
	}

	CPYFPN(fp, r);

	return fp;
}

int
fpu_emul_fmovecr(struct fpemu *fe, struct instruction *insn)
{
	int dstreg, offset;
	uint32_t *fpreg;

	dstreg = (insn->is_word1 >> 7) & 0x7;
	offset = insn->is_word1 & 0x7F;
	fpreg = &(fe->fe_fpframe->fpf_regs[0]);

	(void)fpu_const(&fe->fe_f3, offset);
	(void)fpu_upd_fpsr(fe, &fe->fe_f3);
	fpu_implode(fe, &fe->fe_f3, FTYPE_EXT, &fpreg[dstreg * 3]);
#if DEBUG_FPE
	printf("  fpu_emul_fmovecr: result %08x,%08x,%08x to FP%d\n",
	    fpreg[dstreg * 3], fpreg[dstreg * 3 + 1], fpreg[dstreg * 3 + 2],
	    dstreg);
#endif
	return 0;
}