Everyone, say hello to a real floating point emulator!

The fpemul written for Linux by W. Metzenthen: ported to NetBSD and
then to FreeBSD, and now back to OpenBSD.

1 files changed, 102 insertions, 0 deletions

diff --git a/sys/gnu/arch/i386/fpemul/fpu_system.h b/sys/gnu/arch/i386/fpemul/fpu_system.h
new file mode 100644
index 00000000000..5d3a3cebb5c
--- /dev/null
+++ b/sys/gnu/arch/i386/fpemul/fpu_system.h
@@ -0,0 +1,102 @@
+/*	$OpenBSD: fpu_system.h,v 1.1 1996/08/27 10:32:49 downsj Exp $	*/
+/*
+ *  fpu_system.h
+ *
+ *
+ * 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: fpu_system.h,v 1.4 1995/05/30 07:57:51 rgrimes Exp $
+ *
+ */
+
+
+#ifndef _FPU_SYSTEM_H
+#define _FPU_SYSTEM_H
+
+/* system dependent definitions */
+
+/*
+#include <linux/sched.h>
+#include <linux/kernel.h>
+*/
+
+#if defined(__FreeBSD__)
+#define I387 (*(union i387_union *)&(((struct pcb *)curproc->p_addr)->pcb_savefpu))
+#else
+#define I387 (*(union i387_union *)&(((struct pcb *)curproc->p_addr)->pcb_savefpu.gplemu))
+#endif
+#define FPU_info		(I387.soft.frame)
+
+#define FPU_CS			(*(unsigned short *) &(FPU_info->tf_cs))
+#define FPU_DS			(*(unsigned short *) &(FPU_info->tf_ds))
+#define FPU_EAX			(FPU_info->tf_eax)
+#define FPU_EFLAGS		(FPU_info->tf_eflags)
+#define FPU_EIP			(FPU_info->tf_eip)
+/*#define FPU_ORIG_EIP		(FPU_info->___orig_eip) */
+/*#define FPU_ORIG_EIP		(FPU_info->tf_isp)*/
+#define FPU_ORIG_EIP		(I387.soft.orig_eip)
+
+#define FPU_lookahead           (I387.soft.lookahead)
+#define FPU_entry_eip           (I387.soft.entry_eip)
+
+#define status_word		(I387.soft.swd)
+#define control_word		(I387.soft.cwd)
+#define regs			(I387.soft.regs)
+#define top			(I387.soft.top)
+
+#define ip_offset		(I387.soft.fip)
+#define cs_selector		(I387.soft.fcs)
+#define data_operand_offset	(I387.soft.foo)
+#define operand_selector	(I387.soft.fos)
+
+#endif