diff options
Diffstat (limited to 'sys/gnu/i386/fpemul/fpu_aux.c')
| -rw-r--r-- | sys/gnu/i386/fpemul/fpu_aux.c | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/sys/gnu/i386/fpemul/fpu_aux.c b/sys/gnu/i386/fpemul/fpu_aux.c deleted file mode 100644 index b7b901f..0000000 --- a/sys/gnu/i386/fpemul/fpu_aux.c +++ /dev/null @@ -1,233 +0,0 @@ -/* - * fpu_aux.c - * - * Code to implement some of the FPU auxiliary instructions. - * - * - * 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. - * - * - * $FreeBSD$ - * - */ - - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/proc.h> -#include <machine/cpu.h> -#include <machine/pcb.h> - -#include <gnu/i386/fpemul/fpu_emu.h> -#include <gnu/i386/fpemul/fpu_system.h> -#include <gnu/i386/fpemul/exception.h> -#include <gnu/i386/fpemul/status_w.h> - - -static void -fclex(void) -{ - status_word &= ~(SW_Backward | SW_Summary | SW_Stack_Fault | SW_Precision | - SW_Underflow | SW_Overflow | SW_Zero_Div | SW_Denorm_Op | - SW_Invalid); - FPU_entry_eip = ip_offset; /* We want no net effect */ -} -/* Needs to be externally visible */ -void -finit() -{ - int r; - control_word = 0x037f; - status_word = 0; - top = 0; /* We don't keep top in the status word - * internally. */ - for (r = 0; r < 8; r++) { - regs[r].tag = TW_Empty; - } - FPU_entry_eip = ip_offset = 0; -} - -static FUNC finit_table[] = { - Un_impl, Un_impl, fclex, finit, Un_impl, Un_impl, Un_impl, Un_impl -}; - -void -finit_() -{ - (finit_table[FPU_rm]) (); -} - - -static void -fstsw_ax(void) -{ - - status_word &= ~SW_Top; - status_word |= (top & 7) << SW_Top_Shift; - - *(short *) &FPU_EAX = status_word; - -} - -static FUNC fstsw_table[] = { - fstsw_ax, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl -}; - -void -fstsw_() -{ - (fstsw_table[FPU_rm]) (); -} - - - -static void -fnop(void) -{ -} - -static FUNC fp_nop_table[] = { - fnop, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl -}; - -void -fp_nop() -{ - (fp_nop_table[FPU_rm]) (); -} - - -void -fld_i_() -{ - FPU_REG *st_new_ptr; - - if (STACK_OVERFLOW) { - stack_overflow(); - return; - } - /* fld st(i) */ - if (NOT_EMPTY(FPU_rm)) { - reg_move(&st(FPU_rm), st_new_ptr); - push(); - } else { - if (control_word & EX_Invalid) { - /* The masked response */ - push(); - stack_underflow(); - } else - EXCEPTION(EX_StackUnder); - } - -} - - -void -fxch_i() -{ - /* fxch st(i) */ - FPU_REG t; - register FPU_REG *sti_ptr = &st(FPU_rm); - - if (FPU_st0_tag == TW_Empty) { - if (sti_ptr->tag == TW_Empty) { - stack_underflow(); - stack_underflow_i(FPU_rm); - return; - } - reg_move(sti_ptr, FPU_st0_ptr); - stack_underflow_i(FPU_rm); - return; - } - if (sti_ptr->tag == TW_Empty) { - reg_move(FPU_st0_ptr, sti_ptr); - stack_underflow(); - return; - } - reg_move(FPU_st0_ptr, &t); - reg_move(sti_ptr, FPU_st0_ptr); - reg_move(&t, sti_ptr); -} - - -void -ffree_() -{ - /* ffree st(i) */ - st(FPU_rm).tag = TW_Empty; -} - - -void -ffreep() -{ - /* ffree st(i) + pop - unofficial code */ - st(FPU_rm).tag = TW_Empty; - pop(); -} - - -void -fst_i_() -{ - /* fst st(i) */ - reg_move(FPU_st0_ptr, &st(FPU_rm)); -} - - -void -fstp_i() -{ - /* fstp st(i) */ - reg_move(FPU_st0_ptr, &st(FPU_rm)); - pop(); -} |
