Differential D14609 Diff 48384 lib/libsys/sparc64/sys/__sparc_utrap_align.c

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lib/libsys/sparc64/sys/__sparc_utrap_align.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2002 Jake Burkholder.
				* 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("$FreeBSD$");

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

				#include <signal.h>

				#include "__sparc_utrap_private.h"

				static u_long
				__unaligned_load(u_char *p, int size)
				{
				u_long val;
				int i;

				val = 0;
				for (i = 0; i < size; i++)
				val = (val << 8) \| p[i];
				return (val);
				}

				static void
				__unaligned_store(u_char *p, u_long val, int size)
				{
				int i;

				for (i = 0; i < size; i++)
				p[i] = val >> ((size - i - 1) * 8);
				}

				int
				__unaligned_fixup(struct utrapframe *uf)
				{
				u_char *addr;
				u_long val;
				u_int insn;
				int sig;

				sig = 0;
				addr = (u_char *)uf->uf_sfar;
				insn = (u_int )uf->uf_pc;
				flushw();
				switch (IF_OP(insn)) {
				case IOP_LDST:
				switch (IF_F3_OP3(insn)) {
				case INS3_LDUH:
				val = __unaligned_load(addr, 2);
				__emul_store_reg(uf, IF_F3_RD(insn), val);
				break;
				case INS3_LDUW:
				val = __unaligned_load(addr, 4);
				__emul_store_reg(uf, IF_F3_RD(insn), val);
				break;
				case INS3_LDX:
				val = __unaligned_load(addr, 8);
				__emul_store_reg(uf, IF_F3_RD(insn), val);
				break;
				case INS3_LDSH:
				val = __unaligned_load(addr, 2);
				__emul_store_reg(uf, IF_F3_RD(insn),
				IF_SEXT(val, 16));
				break;
				case INS3_LDSW:
				val = __unaligned_load(addr, 4);
				__emul_store_reg(uf, IF_F3_RD(insn),
				IF_SEXT(val, 32));
				break;
				case INS3_STH:
				val = __emul_fetch_reg(uf, IF_F3_RD(insn));
				__unaligned_store(addr, val, 2);
				break;
				case INS3_STW:
				val = __emul_fetch_reg(uf, IF_F3_RD(insn));
				__unaligned_store(addr, val, 4);
				break;
				case INS3_STX:
				val = __emul_fetch_reg(uf, IF_F3_RD(insn));
				__unaligned_store(addr, val, 8);
				break;
				default:
				sig = SIGILL;
				break;
				}
				break;
				default:
				sig = SIGILL;
				break;
				}
				return (sig);
				}