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	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1992 NeXT Computer, Inc.
	24	*
	25	* Intel386 Family: Processor exception frame.
	26	*
	27	* HISTORY
	28	*
	29	* 31 August 1992 ? at NeXT
	30	* Added v86 mode stuff.
	31	*
	32	* 8 June 1992 ? at NeXT
	33	* Changed name of write field in err_code_t
	34	* which collided with write() in shlib.
	35	*
	36	* 30 March 1992 ? at NeXT
	37	* Created.
	38	*/
	39
	40	/*
	41	* Format of the error code
	42	* generated by the hardware
	43	* for certain exceptions.
	44	*/
	45
	46	typedef union err_code {
	47	struct err_code_normal {
	48	unsigned int ext :1,
	49	tbl :2,
	50	#define ERR_GDT 0
	51	#define ERR_IDT 1
	52	#define ERR_LDT 2
	53	index :13,
	54	:16;
	55	} normal;
	56	struct err_code_pgfault {
	57	unsigned int prot :1,
	58	wrtflt :1,
	59	user :1,
	60	:29;
	61	} pgfault;
	62	} err_code_t;
	63
	64	#include <architecture/i386/sel.h>
	65
	66	/*
	67	* The actual hardware exception frame
	68	* is variable in size. An error code is
	69	* only pushed for certain exceptions.
	70	* Previous stack information is only
	71	* pushed for exceptions that cause a
	72	* change in privilege level. The dpl
	73	* field of the saved CS selector can be
	74	* used to determine whether this is the
	75	* case. If the interrupted task was
	76	* executing in v86 mode, then the data
	77	* segment registers are also present in
	78	* the exception frame (in addition to
	79	* previous stack information). This
	80	* case can be determined by examining
	81	* eflags.
	82	*/
	83
	84	typedef struct except_frame {
	85	err_code_t err;
	86	unsigned int eip;
	87	sel_t cs;
	88	unsigned int :0;
	89	unsigned int eflags;
	90	unsigned int esp;
	91	sel_t ss;
	92	unsigned int :0;
	93	unsigned short v_es;
	94	unsigned int :0;
	95	unsigned short v_ds;
	96	unsigned int :0;
	97	unsigned short v_fs;
	98	unsigned int :0;
	99	unsigned short v_gs;
	100	unsigned int :0;
	101	} except_frame_t;
	102
	103	/*
	104	* Values in eflags.
	105	*/
	106
	107	#ifndef EFL_CF /* FIXME */
	108	#define EFL_CF 0x00001
	109	#define EFL_PF 0x00004
	110	#define EFL_AF 0x00010
	111	#define EFL_ZF 0x00040
	112	#define EFL_SF 0x00080
	113	#define EFL_TF 0x00100
	114	#define EFL_IF 0x00200
	115	#define EFL_DF 0x00400
	116	#define EFL_OF 0x00800
	117	#define EFL_IOPL 0x03000
	118	#define EFL_NT 0x04000
	119	#define EFL_RF 0x10000
	120	#define EFL_VM 0x20000
	121	#define EFL_AC 0x40000
	122	#endif
	123
	124	#define EFL_CLR 0xfff88028
	125	#define EFL_SET 0x00000002