/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: releng/12.0/lib/libc/sparc64/sys/__sparc_utrap_emul.c 326193 2017-11-25 17:12:48Z pfg $");

#include <sys/types.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/instr.h>

#include <signal.h>

#include "__sparc_utrap_private.h"
#include "fpu_reg.h"

int
__emul_insn(struct utrapframe *uf)
{
	u_long reg, res;
	u_long *addr;
	u_int insn;
	int sig;
	int rd;
	int i;

	sig = 0;
	insn = *(u_int *)uf->uf_pc;
	flushw();
	switch (IF_OP(insn)) {
	case IOP_MISC:
		switch (IF_F3_OP3(insn)) {
		case INS2_POPC:
			if (IF_F3_RS1(insn) != 0) {
				sig = SIGILL;
				break;
			}
			reg = __emul_f3_op2(uf, insn);
			for (i = 0; i < 64; i++)
				res += (reg >> i) & 1;
			__emul_store_reg(uf, IF_F3_RD(insn), res);
			break;
		default:
			sig = SIGILL;
			break;
		}
		break;
	case IOP_LDST:
		switch (IF_F3_OP3(insn)) {
		case INS3_LDQF:
			rd = INSFPdq_RN(IF_F3_RD(insn));
			addr = (u_long *)__emul_f3_memop_addr(uf, insn);
			__fpu_setreg64(rd, addr[0]);
			__fpu_setreg64(rd + 2, addr[1]);
			break;
		case INS3_STQF:
			rd = INSFPdq_RN(IF_F3_RD(insn));
			addr = (u_long *)__emul_f3_memop_addr(uf, insn);
			addr[0] = __fpu_getreg64(rd);
			addr[1] = __fpu_getreg64(rd + 2);
			break;
		default:
			sig = SIGILL;
			break;
		}
		break;
	default:
		sig = SIGILL;
		break;
	}
	return (sig);
}

u_long
__emul_fetch_reg(struct utrapframe *uf, int reg)
{
	struct frame *frm;

	if (reg == IREG_G0)
		return (0);
	else if (reg < IREG_O0)	/* global */
		return (uf->uf_global[reg]);
	else if (reg < IREG_L0)	/* out */
		return (uf->uf_out[reg - IREG_O0]);
	else {			/* local, in */
		/*
		 * The in registers are immediately after the locals in
		 * the frame.
		 */
		frm = (struct frame *)(uf->uf_out[6] + SPOFF);
		return (frm->fr_local[reg - IREG_L0]);
	}
}

void
__emul_store_reg(struct utrapframe *uf, int reg, u_long val)
{
	struct frame *frm;

	if (reg == IREG_G0)
		return;
	if (reg < IREG_O0)	/* global */
		uf->uf_global[reg] = val;
	else if (reg < IREG_L0)	/* out */
		uf->uf_out[reg - IREG_O0] = val;
	else {
		/*
		 * The in registers are immediately after the locals in
		 * the frame.
		 */
		frm = (struct frame *)(uf->uf_out[6] + SPOFF);
		frm->fr_local[reg - IREG_L0] = val;
	}
}

u_long
__emul_f3_op2(struct utrapframe *uf, u_int insn)
{

	if (IF_F3_I(insn) != 0)
		return (IF_SIMM(insn, 13));
	else
		return (__emul_fetch_reg(uf, IF_F3_RS2(insn)));
}

u_long
__emul_f3_memop_addr(struct utrapframe *uf, u_int insn)
{
	u_long addr;

	addr = __emul_f3_op2(uf, insn) + __emul_fetch_reg(uf, IF_F3_RS1(insn));
	return (addr);
}
