274 lines
8.8 KiB
C
274 lines
8.8 KiB
C
/*
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* load_store.c
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*
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* This file contains most of the code to interpret the FPU instructions
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* which load and store from user memory.
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*
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*
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* Copyright (C) 1992,1993,1994
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* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
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* Australia. E-mail billm@vaxc.cc.monash.edu.au
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* All rights reserved.
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*
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* This copyright notice covers the redistribution and use of the
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* FPU emulator developed by W. Metzenthen. It covers only its use
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* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
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* use is not permitted under this copyright.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must include information specifying
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* that source code for the emulator is freely available and include
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* either:
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* a) an offer to provide the source code for a nominal distribution
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* fee, or
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* b) list at least two alternative methods whereby the source
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* can be obtained, e.g. a publically accessible bulletin board
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* and an anonymous ftp site from which the software can be
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* downloaded.
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* 3. All advertising materials specifically mentioning features or use of
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* this emulator must acknowledge that it was developed by W. Metzenthen.
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* 4. The name of W. Metzenthen may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* The purpose of this copyright, based upon the Berkeley copyright, is to
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* ensure that the covered software remains freely available to everyone.
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*
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* The software (with necessary differences) is also available, but under
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* the terms of the GNU copyleft, for the Linux operating system and for
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* the djgpp ms-dos extender.
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*
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* W. Metzenthen June 1994.
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*
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*
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* $Id: load_store.c,v 1.11 1997/08/31 22:22:19 bde Exp $
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*
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*/
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/*---------------------------------------------------------------------------+
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| Note: |
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| The file contains code which accesses user memory. |
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| Emulator static data may change when user memory is accessed, due to |
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| other processes using the emulator while swapping is in progress. |
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+---------------------------------------------------------------------------*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <machine/pcb.h>
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#include <gnu/i386/fpemul/fpu_emu.h>
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#include <gnu/i386/fpemul/fpu_system.h>
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#include <gnu/i386/fpemul/status_w.h>
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#define _NONE_ 0 /* FPU_st0_ptr etc not needed */
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#define _REG0_ 1 /* Will be storing st(0) */
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#define _PUSH_ 3 /* Need to check for space to push onto stack */
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#define _null_ 4 /* Function illegal or not implemented */
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#define pop_0() { pop_ptr->tag = TW_Empty; top++; }
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static unsigned char type_table[32] = {
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_PUSH_, _PUSH_, _PUSH_, _PUSH_,
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_null_, _null_, _null_, _null_,
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_REG0_, _REG0_, _REG0_, _REG0_,
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_REG0_, _REG0_, _REG0_, _REG0_,
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_NONE_, _null_, _NONE_, _PUSH_,
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_NONE_, _PUSH_, _null_, _PUSH_,
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_NONE_, _null_, _NONE_, _REG0_,
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_NONE_, _REG0_, _NONE_, _REG0_
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};
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void
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load_store_instr(char type)
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{
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FPU_REG *pop_ptr; /* We need a version of FPU_st0_ptr which
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* won't change. */
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pop_ptr = NULL; /* Initialized just to stop compiler warnings. */
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switch (type_table[(int) (unsigned) type]) {
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case _NONE_:
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break;
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case _REG0_:
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pop_ptr = &st(0); /* Some of these instructions pop
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* after storing */
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FPU_st0_ptr = pop_ptr; /* Set the global variables. */
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FPU_st0_tag = FPU_st0_ptr->tag;
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break;
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case _PUSH_:
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{
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pop_ptr = &st(-1);
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if (pop_ptr->tag != TW_Empty) {
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stack_overflow();
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return;
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}
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top--;
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}
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break;
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case _null_:
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Un_impl();
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return;
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#ifdef PARANOID
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default:
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return EXCEPTION(EX_INTERNAL);
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#endif /* PARANOID */
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}
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switch (type) {
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case 000: /* fld m32real */
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reg_load_single();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 001: /* fild m32int */
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reg_load_int32();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 002: /* fld m64real */
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reg_load_double();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 003: /* fild m16int */
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reg_load_int16();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 010: /* fst m32real */
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reg_store_single();
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break;
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case 011: /* fist m32int */
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reg_store_int32();
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break;
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case 012: /* fst m64real */
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reg_store_double();
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break;
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case 013: /* fist m16int */
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reg_store_int16();
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break;
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case 014: /* fstp m32real */
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if (reg_store_single())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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case 015: /* fistp m32int */
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if (reg_store_int32())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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case 016: /* fstp m64real */
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if (reg_store_double())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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case 017: /* fistp m16int */
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if (reg_store_int16())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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case 020: /* fldenv m14/28byte */
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fldenv();
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break;
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case 022: /* frstor m94/108byte */
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frstor();
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break;
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case 023: /* fbld m80dec */
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reg_load_bcd();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 024: /* fldcw */
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REENTRANT_CHECK(OFF);
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control_word = fusword((unsigned short *) FPU_data_address);
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REENTRANT_CHECK(ON);
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#ifdef NO_UNDERFLOW_TRAP
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if (!(control_word & EX_Underflow)) {
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control_word |= EX_Underflow;
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}
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#endif
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/* We want no net effect: */
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FPU_data_address = (void *) (intptr_t) data_operand_offset;
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FPU_entry_eip = ip_offset; /* We want no net effect */
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break;
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case 025: /* fld m80real */
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reg_load_extended();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 027: /* fild m64int */
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reg_load_int64();
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setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */
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reg_move(&FPU_loaded_data, pop_ptr);
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break;
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case 030: /* fstenv m14/28byte */
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fstenv();
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/* We want no net effect: */
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FPU_data_address = (void *) (intptr_t) data_operand_offset;
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FPU_entry_eip = ip_offset; /* We want no net effect */
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break;
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case 032: /* fsave */
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fsave();
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/* We want no net effect: */
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FPU_data_address = (void *) (intptr_t) data_operand_offset;
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FPU_entry_eip = ip_offset; /* We want no net effect */
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break;
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case 033: /* fbstp m80dec */
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if (reg_store_bcd())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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case 034: /* fstcw m16int */
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REENTRANT_CHECK(OFF);
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/* verify_area(VERIFY_WRITE, FPU_data_address, 2);*/
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susword( (short *) FPU_data_address,control_word);
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REENTRANT_CHECK(ON);
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/* We want no net effect: */
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FPU_data_address = (void *) (intptr_t ) data_operand_offset;
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FPU_entry_eip = ip_offset; /* We want no net effect */
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break;
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case 035: /* fstp m80real */
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if (reg_store_extended())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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case 036: /* fstsw m2byte */
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status_word &= ~SW_Top;
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status_word |= (top & 7) << SW_Top_Shift;
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REENTRANT_CHECK(OFF);
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/* verify_area(VERIFY_WRITE, FPU_data_address, 2);*/
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susword( (short *) FPU_data_address,status_word);
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REENTRANT_CHECK(ON);
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/* We want no net effect: */
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FPU_data_address = (void *) (intptr_t) data_operand_offset;
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FPU_entry_eip = ip_offset; /* We want no net effect */
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break;
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case 037: /* fistp m64int */
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if (reg_store_int64())
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pop_0();/* pop only if the number was actually stored
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* (see the 80486 manual p16-28) */
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break;
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}
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}
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