errors.c

freebsd v4.4内核源码

/*
 *  errors.c
 *
 *  The error handling functions for wm-FPU-emu
 *
 *
 * Copyright (C) 1992,1993,1994
 *                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
 *                       Australia.  E-mail   [e-mail]
 * 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: src/sys/gnu/i386/fpemul/errors.c,v 1.5.2.1 1999/09/05 08:09:35 peter Exp $
 *
 */

/*---------------------------------------------------------------------------+
 | 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/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>
#include <gnu/i386/fpemul/control_w.h>
#include <gnu/i386/fpemul/reg_constant.h>
#include <gnu/i386/fpemul/version.h>

/* */
#undef PRINT_MESSAGES
/* */


void
Un_impl(void)
{
	unsigned char byte1, FPU_modrm;

	REENTRANT_CHECK(OFF);
	byte1 = fubyte((unsigned char *) FPU_ORIG_EIP);
	FPU_modrm = fubyte(1 + (unsigned char *) FPU_ORIG_EIP);

	printf("Unimplemented FPU Opcode at eip=%p : %02x ",
	    FPU_ORIG_EIP, byte1);

	if (FPU_modrm >= 0300)
		printf("%02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7);
	else
		printf("/%d\n", (FPU_modrm >> 3) & 7);
	REENTRANT_CHECK(ON);

	EXCEPTION(EX_Invalid);

}




void
emu_printall()
{
	int     i;
	static char *tag_desc[] = {"Valid", "Zero", "ERROR", "ERROR",
	"DeNorm", "Inf", "NaN", "Empty"};
	unsigned char byte1, FPU_modrm;

	REENTRANT_CHECK(OFF);
	byte1 = fubyte((unsigned char *) FPU_ORIG_EIP);
	FPU_modrm = fubyte(1 + (unsigned char *) FPU_ORIG_EIP);

#ifdef DEBUGGING
	if (status_word & SW_Backward)
		printf("SW: backward compatibility\n");
	if (status_word & SW_C3)
		printf("SW: condition bit 3\n");
	if (status_word & SW_C2)
		printf("SW: condition bit 2\n");
	if (status_word & SW_C1)
		printf("SW: condition bit 1\n");
	if (status_word & SW_C0)
		printf("SW: condition bit 0\n");
	if (status_word & SW_Summary)
		printf("SW: exception summary\n");
	if (status_word & SW_Stack_Fault)
		printf("SW: stack fault\n");
	if (status_word & SW_Precision)
		printf("SW: loss of precision\n");
	if (status_word & SW_Underflow)
		printf("SW: underflow\n");
	if (status_word & SW_Overflow)
		printf("SW: overflow\n");
	if (status_word & SW_Zero_Div)
		printf("SW: divide by zero\n");
	if (status_word & SW_Denorm_Op)
		printf("SW: denormalized operand\n");
	if (status_word & SW_Invalid)
		printf("SW: invalid operation\n");
#endif				/* DEBUGGING */

	status_word = status_word & ~SW_Top;
	status_word |= (top & 7) << SW_Top_Shift;

	printf("At %p: %02x ", FPU_ORIG_EIP, byte1);
	if (FPU_modrm >= 0300)
		printf("%02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7);
	else
		printf("/%d, mod=%d rm=%d\n",
		    (FPU_modrm >> 3) & 7, (FPU_modrm >> 6) & 3, FPU_modrm & 7);

	printf(" SW: b=%d st=%d es=%d sf=%d cc=%d%d%d%d ef=%d%d%d%d%d%d\n",
	    status_word & 0x8000 ? 1 : 0,	/* busy */
	    (status_word & 0x3800) >> 11,	/* stack top pointer */
	    status_word & 0x80 ? 1 : 0,	/* Error summary status */
	    status_word & 0x40 ? 1 : 0,	/* Stack flag */
	    status_word & SW_C3 ? 1 : 0, status_word & SW_C2 ? 1 : 0,	/* cc */
	    status_word & SW_C1 ? 1 : 0, status_word & SW_C0 ? 1 : 0,	/* cc */
	    status_word & SW_Precision ? 1 : 0, status_word & SW_Underflow ? 1 : 0,
	    status_word & SW_Overflow ? 1 : 0, status_word & SW_Zero_Div ? 1 : 0,
	    status_word & SW_Denorm_Op ? 1 : 0, status_word & SW_Invalid ? 1 : 0);

	printf(" CW: ic=%d rc=%d%d pc=%d%d iem=%d     ef=%d%d%d%d%d%d\n",
	    control_word & 0x1000 ? 1 : 0,
	    (control_word & 0x800) >> 11, (control_word & 0x400) >> 10,
	    (control_word & 0x200) >> 9, (control_word & 0x100) >> 8,
	    control_word & 0x80 ? 1 : 0,
	    control_word & SW_Precision ? 1 : 0, control_word & SW_Underflow ? 1 : 0,
	    control_word & SW_Overflow ? 1 : 0, control_word & SW_Zero_Div ? 1 : 0,
	    control_word & SW_Denorm_Op ? 1 : 0, control_word & SW_Invalid ? 1 : 0);

	for (i = 0; i < 8; i++) {
		FPU_REG *r = &st(i);
		switch (r->tag) {
		case TW_Empty:
			continue;
			break;
		case TW_Zero:
			printf("st(%d)  %c .0000 0000 0000 0000         ",
			    i, r->sign ? '-' : '+');
			break;
		case TW_Valid:
		case TW_NaN:
		case TW_Denormal:
		case TW_Infinity:
			printf("st(%d)  %c .%04x %04x %04x %04x e%+-6d ", i,
			    r->sign ? '-' : '+',
			    (long) (r->sigh >> 16),
			    (long) (r->sigh & 0xFFFF),
			    (long) (r->sigl >> 16),
			    (long) (r->sigl & 0xFFFF),
			    r->exp - EXP_BIAS + 1);
			break;
		default:
			printf("Whoops! Error in errors.c      ");
			break;
		}
		printf("%s\n", tag_desc[(int) (unsigned) r->tag]);
	}

	printf("[data] %c .%04x %04x %04x %04x e%+-6d ",
	    FPU_loaded_data.sign ? '-' : '+',
	    (long) (FPU_loaded_data.sigh >> 16),
	    (long) (FPU_loaded_data.sigh & 0xFFFF),
	    (long) (FPU_loaded_data.sigl >> 16),
	    (long) (FPU_loaded_data.sigl & 0xFFFF),
	    FPU_loaded_data.exp - EXP_BIAS + 1);
	printf("%s\n", tag_desc[(int) (unsigned) FPU_loaded_data.tag]);
	REENTRANT_CHECK(ON);

}

static struct {
	int     type;
	char   *name;
}       exception_names[] = {
	{
		EX_StackOver, "stack overflow"
	},
	{
		EX_StackUnder, "stack underflow"
	},
	{
		EX_Precision, "loss of precision"
	},
	{
		EX_Underflow, "underflow"
	},
	{
		EX_Overflow, "overflow"
	},
	{
		EX_ZeroDiv, "divide by zero"
	},
	{
		EX_Denormal, "denormalized operand"
	},
	{
		EX_Invalid, "invalid operation"
	},
	{
		EX_INTERNAL, "INTERNAL BUG in " FPU_VERSION
	},
	{
		0, NULL
	}
};
/*
 EX_INTERNAL is always given with a code which indicates where the
 error was detected.

 Internal error types:
       0x14   in e14.c
       0x1nn  in a *.c file:
              0x101  in reg_add_sub.c
              0x102  in reg_mul.c
              0x103  in poly_sin.c
              0x104  in poly_tan.c
              0x105  in reg_mul.c
	      0x106  in reg_mov.c
              0x107  in fpu_trig.c
	      0x108  in reg_compare.c
	      0x109  in reg_compare.c
	      0x110  in reg_add_sub.c
	      0x111  in interface.c
	      0x112  in fpu_trig.c
	      0x113  in reg_add_sub.c
	      0x114  in reg_ld_str.c
	      0x115  in fpu_trig.c
	      0x116  in fpu_trig.c
	      0x117  in fpu_trig.c
	      0x118  in fpu_trig.c
	      0x119  in fpu_trig.c
	      0x120  in poly_atan.c
	      0x121  in reg_compare.c
	      0x122  in reg_compare.c
	      0x123  in reg_compare.c
       0x2nn  in an *.s file:
              0x201  in reg_u_add.S
              0x202  in reg_u_div.S
              0x203  in reg_u_div.S
              0x204  in reg_u_div.S
              0x205  in reg_u_mul.S
              0x206  in reg_u_sub.S
              0x207  in wm_sqrt.S
	      0x208  in reg_div.S
              0x209  in reg_u_sub.S
              0x210  in reg_u_sub.S
              0x211  in reg_u_sub.S
              0x212  in reg_u_sub.S