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/*
* Copyright (c) 1992 NeXT Computer, Inc.
*
* Intel386 Family: Processor exception frame.
*
* HISTORY
*
* 31 August 1992 David E. Bohman at NeXT
* Added v86 mode stuff.
*
* 8 June 1992 David E. Bohman at NeXT
* Changed name of write field in err_code_t
* which collided with write() in shlib.
*
* 30 March 1992 David E. Bohman at NeXT
* Created.
*/
/*
* Format of the error code
* generated by the hardware
* for certain exceptions.
*/
typedef union err_code {
struct err_code_normal {
unsigned int ext :1,
tbl :2,
#define ERR_GDT 0
#define ERR_IDT 1
#define ERR_LDT 2
index :13,
:16;
} normal;
struct err_code_pgfault {
unsigned int prot :1,
wrtflt :1,
user :1,
:29;
} pgfault;
} err_code_t;
#import <architecture/i386/sel.h>
/*
* The actual hardware exception frame
* is variable in size. An error code is
* only pushed for certain exceptions.
* Previous stack information is only
* pushed for exceptions that cause a
* change in privilege level. The dpl
* field of the saved CS selector can be
* used to determine whether this is the
* case. If the interrupted task was
* executing in v86 mode, then the data
* segment registers are also present in
* the exception frame (in addition to
* previous stack information). This
* case can be determined by examining
* eflags.
*/
typedef struct except_frame {
err_code_t err;
unsigned int eip;
sel_t cs;
unsigned int :0;
unsigned int eflags;
unsigned int esp;
sel_t ss;
unsigned int :0;
unsigned short v_es;
unsigned int :0;
unsigned short v_ds;
unsigned int :0;
unsigned short v_fs;
unsigned int :0;
unsigned short v_gs;
unsigned int :0;
} except_frame_t;
/*
* Values in eflags.
*/
#define EFL_CF 0x00001
#define EFL_PF 0x00004
#define EFL_AF 0x00010
#define EFL_ZF 0x00040
#define EFL_SF 0x00080
#define EFL_TF 0x00100
#define EFL_IF 0x00200
#define EFL_DF 0x00400
#define EFL_OF 0x00800
#define EFL_IOPL 0x03000
#define EFL_NT 0x04000
#define EFL_RF 0x10000
#define EFL_VM 0x20000
#define EFL_AC 0x40000
#define EFL_CLR 0xfff88028
#define EFL_SET 0x00000002
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.