diff options
Diffstat (limited to 'sys/gnu/i386/fpemul/load_store.c')
| -rw-r--r-- | sys/gnu/i386/fpemul/load_store.c | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/sys/gnu/i386/fpemul/load_store.c b/sys/gnu/i386/fpemul/load_store.c deleted file mode 100644 index 28e35f4..0000000 --- a/sys/gnu/i386/fpemul/load_store.c +++ /dev/null @@ -1,273 +0,0 @@ -/* - * load_store.c - * - * This file contains most of the code to interpret the FPU instructions - * which load and store from user memory. - * - * - * Copyright (C) 1992,1993,1994 - * W. Metzenthen, 22 Parker St, Ormond, Vic 3163, - * Australia. E-mail billm@vaxc.cc.monash.edu.au - * All rights reserved. - * - * This copyright notice covers the redistribution and use of the - * FPU emulator developed by W. Metzenthen. It covers only its use - * in the 386BSD, FreeBSD and NetBSD operating systems. Any other - * use is not permitted under this copyright. - * - * 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 include information specifying - * that source code for the emulator is freely available and include - * either: - * a) an offer to provide the source code for a nominal distribution - * fee, or - * b) list at least two alternative methods whereby the source - * can be obtained, e.g. a publically accessible bulletin board - * and an anonymous ftp site from which the software can be - * downloaded. - * 3. All advertising materials specifically mentioning features or use of - * this emulator must acknowledge that it was developed by W. Metzenthen. - * 4. The name of W. Metzenthen may not be used to endorse or promote - * products derived from this software without specific prior written - * permission. - * - * THIS SOFTWARE IS PROVIDED ``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 - * W. METZENTHEN 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. - * - * - * The purpose of this copyright, based upon the Berkeley copyright, is to - * ensure that the covered software remains freely available to everyone. - * - * The software (with necessary differences) is also available, but under - * the terms of the GNU copyleft, for the Linux operating system and for - * the djgpp ms-dos extender. - * - * W. Metzenthen June 1994. - * - * - * $FreeBSD$ - * - */ - -/*---------------------------------------------------------------------------+ - | Note: | - | The file contains code which accesses user memory. | - | Emulator static data may change when user memory is accessed, due to | - | other processes using the emulator while swapping is in progress. | - +---------------------------------------------------------------------------*/ - -#include <sys/param.h> -#include <sys/proc.h> -#include <sys/systm.h> -#include <machine/pcb.h> - -#include <gnu/i386/fpemul/fpu_emu.h> -#include <gnu/i386/fpemul/fpu_system.h> -#include <gnu/i386/fpemul/status_w.h> - - -#define _NONE_ 0 /* FPU_st0_ptr etc not needed */ -#define _REG0_ 1 /* Will be storing st(0) */ -#define _PUSH_ 3 /* Need to check for space to push onto stack */ -#define _null_ 4 /* Function illegal or not implemented */ - -#define pop_0() { pop_ptr->tag = TW_Empty; top++; } - - -static unsigned char type_table[32] = { - _PUSH_, _PUSH_, _PUSH_, _PUSH_, - _null_, _null_, _null_, _null_, - _REG0_, _REG0_, _REG0_, _REG0_, - _REG0_, _REG0_, _REG0_, _REG0_, - _NONE_, _null_, _NONE_, _PUSH_, - _NONE_, _PUSH_, _null_, _PUSH_, - _NONE_, _null_, _NONE_, _REG0_, - _NONE_, _REG0_, _NONE_, _REG0_ -}; - -void -load_store_instr(char type) -{ - FPU_REG *pop_ptr; /* We need a version of FPU_st0_ptr which - * won't change. */ - - pop_ptr = NULL; /* Initialized just to stop compiler warnings. */ - - - switch (type_table[(int) (unsigned) type]) { - case _NONE_: - break; - case _REG0_: - pop_ptr = &st(0); /* Some of these instructions pop - * after storing */ - - FPU_st0_ptr = pop_ptr; /* Set the global variables. */ - FPU_st0_tag = FPU_st0_ptr->tag; - break; - case _PUSH_: - { - pop_ptr = &st(-1); - if (pop_ptr->tag != TW_Empty) { - stack_overflow(); - return; - } - top--; - } - break; - case _null_: - Un_impl(); - return; -#ifdef PARANOID - default: - return EXCEPTION(EX_INTERNAL); -#endif /* PARANOID */ - } - - switch (type) { - case 000: /* fld m32real */ - reg_load_single(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 001: /* fild m32int */ - reg_load_int32(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 002: /* fld m64real */ - reg_load_double(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 003: /* fild m16int */ - reg_load_int16(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 010: /* fst m32real */ - reg_store_single(); - break; - case 011: /* fist m32int */ - reg_store_int32(); - break; - case 012: /* fst m64real */ - reg_store_double(); - break; - case 013: /* fist m16int */ - reg_store_int16(); - break; - case 014: /* fstp m32real */ - if (reg_store_single()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - case 015: /* fistp m32int */ - if (reg_store_int32()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - case 016: /* fstp m64real */ - if (reg_store_double()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - case 017: /* fistp m16int */ - if (reg_store_int16()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - case 020: /* fldenv m14/28byte */ - fldenv(); - break; - case 022: /* frstor m94/108byte */ - frstor(); - break; - case 023: /* fbld m80dec */ - reg_load_bcd(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 024: /* fldcw */ - REENTRANT_CHECK(OFF); - control_word = fuword16((unsigned short *) FPU_data_address); - REENTRANT_CHECK(ON); -#ifdef NO_UNDERFLOW_TRAP - if (!(control_word & EX_Underflow)) { - control_word |= EX_Underflow; - } -#endif - /* We want no net effect: */ - FPU_data_address = (void *) (intptr_t) data_operand_offset; - FPU_entry_eip = ip_offset; /* We want no net effect */ - break; - case 025: /* fld m80real */ - reg_load_extended(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 027: /* fild m64int */ - reg_load_int64(); - setcc(0); /* Clear the SW_C1 bit, "other bits undefined" */ - reg_move(&FPU_loaded_data, pop_ptr); - break; - case 030: /* fstenv m14/28byte */ - fstenv(); - /* We want no net effect: */ - FPU_data_address = (void *) (intptr_t) data_operand_offset; - FPU_entry_eip = ip_offset; /* We want no net effect */ - break; - case 032: /* fsave */ - fsave(); - /* We want no net effect: */ - FPU_data_address = (void *) (intptr_t) data_operand_offset; - FPU_entry_eip = ip_offset; /* We want no net effect */ - break; - case 033: /* fbstp m80dec */ - if (reg_store_bcd()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - case 034: /* fstcw m16int */ - REENTRANT_CHECK(OFF); -/* verify_area(VERIFY_WRITE, FPU_data_address, 2);*/ - suword16( (short *) FPU_data_address,control_word); - REENTRANT_CHECK(ON); - /* We want no net effect: */ - FPU_data_address = (void *) (intptr_t ) data_operand_offset; - FPU_entry_eip = ip_offset; /* We want no net effect */ - break; - case 035: /* fstp m80real */ - if (reg_store_extended()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - case 036: /* fstsw m2byte */ - status_word &= ~SW_Top; - status_word |= (top & 7) << SW_Top_Shift; - REENTRANT_CHECK(OFF); -/* verify_area(VERIFY_WRITE, FPU_data_address, 2);*/ - suword16( (short *) FPU_data_address,status_word); - REENTRANT_CHECK(ON); - /* We want no net effect: */ - FPU_data_address = (void *) (intptr_t) data_operand_offset; - FPU_entry_eip = ip_offset; /* We want no net effect */ - break; - case 037: /* fistp m64int */ - if (reg_store_int64()) - pop_0();/* pop only if the number was actually stored - * (see the 80486 manual p16-28) */ - break; - } -} |
