165 lines
7.2 KiB
C
165 lines
7.2 KiB
C
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/****************************************************************/
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/* */
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/* pcb.h */
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/* */
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/* Process Control and Interrupt data structures */
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/* */
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/* November 26, 1991 */
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/* */
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/* Copyright (c) 1995 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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/***************************************************************
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2000/03/22 ska
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There is a newly documented (though used previously) side effect
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of the definitions and assumptions made herein:
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The assembly sources may use a macro named "PUSH$ALL" to push
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all processor registers onto the stack, see example below:
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PUSH$ALL
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mov ax, sp
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...
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push ax
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call _c_function
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pop cx
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The stack pointer immediately after the PUSH$ALL macro shall point to
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a structure used as an "iregs" structure within the C language.
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Therefore the internal of the structure "iregs" _must_ always
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match the implementation of the macro "PUSH$ALL".
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*/
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#ifndef __PCB_H
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#define __PCB_H
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#ifdef MAIN
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#ifdef VERSION_STRINGS
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static BYTE *pcb_hRcsId =
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"$Id: pcb.h 1316 2007-05-15 17:48:47Z bartoldeman $";
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#endif
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#endif
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/* Force one-byte alignment for all the internal structures, see above */
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#include <algnbyte.h>
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/* */
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/* interrupt handler structure definition */
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/* */
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typedef union {
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UWORD x; /* access mode for ax, bx, etc. */
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struct {
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UBYTE l; /* access mode for al, bl, etc. */
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UBYTE h; /* access mode for ah, bh, etc. */
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} b;
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} xreg;
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/* The structure assumes that:
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1) An interrupt was invoked, &
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2) the PUSH$ALL macro was invoked immediately after that.
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Furthermore, the PUSH$ALL macro must push ES first and AX last.
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-- 2000/03/22 ska*/
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/* maps MS-DOS unique stacking order */
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typedef struct _iregss {
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xreg a, b, c, d;
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UWORD si, di, bp, ds, es;
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UWORD ip, cs, flags;
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} iregs;
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/* struct used for local copy of registers */
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typedef struct {
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xreg a, b, c, d;
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UWORD si, di, ds, es;
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} lregs;
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/* Process control block for task switching */
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typedef struct {
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UWORD pc_ss;
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UWORD pc_sp;
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iregs pc_regs;
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} pcb;
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/* Note: The following figure is not made by myself and I assume that
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the order of "ES" through "AX" are misinterpreted?! -- 2000/03/22 ska*/
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/* For MSC, the following offsets must match the assembly process */
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/* support offsets */
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/* NOTE: Alignemnts must be set to 1 (-Zp1) */
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/* ss: 0 */
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/* sp: 2 */
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/* es: 4 */
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/* ds: 6 */
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/* di: 8 */
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/* si: 10 */
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/* bp: 12 */
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/* sp: 14 NOTE: not used in this structure */
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/* bx: 16 */
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/* dx: 18 */
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/* cx: 20 */
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/* ax: 22 */
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/* ip: 24 */
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/* cs: 26 */
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/* flags: 28 */
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/* */
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/* For Borland C, the following offsets must match the assembly process */
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/* support offsets */
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/* ss: 0 */
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/* sp: 2 */
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/* bp: 4 */
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/* di: 6 */
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/* si: 8 */
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/* ds: 10 */
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/* es: 12 */
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/* dx: 14 */
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/* cx: 16 */
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/* bx: 18 */
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/* ax: 20 */
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/* ip: 22 */
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/* cs: 24 */
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/* flags: 26 */
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#define BP bp
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#define DI di
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#define SI si
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#define DS ds
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#define ES es
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#define DX d.x
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#define CX c.x
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#define BX b.x
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#define AX a.x
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#define DH d.b.h
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#define CH c.b.h
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#define BH b.b.h
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#define AH a.b.h
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#define DL d.b.l
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#define CL c.b.l
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#define BL b.b.l
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#define AL a.b.l
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#define IP ip
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#define CS cs
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#define FLAGS flags
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#define FLG_ZERO 0x0040
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#define FLG_CARRY 0x0001
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/* Allow default alignment from now on */
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#include <algndflt.h>
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#endif
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