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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/branches/UNSTABLE@988 6ac86273-5f31-0410-b378-82cca8765d1b
187 lines
4.2 KiB
PHP
187 lines
4.2 KiB
PHP
;
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; File:
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; stacks.inc
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; Description:
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; Macro support for register stack frame
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;
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; Copyright (c) 1998
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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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; $Id$
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;
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;
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; Standard stack frame used throughout DOS-C
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;
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; MS-DOS specific
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;
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; +---------------+
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; | irp hi | 26
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; +---------------+
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; | irp low | 24
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; +---------------+
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; | flags | 22
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; +---------------+
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; | cs | 20
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; +---------------+
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; | ip | 18
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; +---------------+
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; | es | 16
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; +---------------+
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; | ds | 14
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; +---------------+
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; | bp | 12
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; +---------------+
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; | di | 10
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; +---------------+
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; | si | 8
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; +---------------+
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; | dx | 6
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; +---------------+
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; | cx | 4
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; +---------------+
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; | bx | 2
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; +---------------+
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; | ax | 0
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; +---------------+
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;
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;; Note: The order of the pushed registers _must_ match with the definition
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;; of the "iregs" structure within PCB.H, because a pointer to the last
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;; pushed register is used as a pointer to a "iregs" structure within the
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;; called C sources! -- 2000/03/22 ska
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; Don't use `struc RegFrame' etc. here because it interferes with segment
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; definitions.
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reg_ax equ 0
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reg_bx equ 2
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reg_cx equ 4
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reg_dx equ 6
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reg_si equ 8
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reg_di equ 10
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reg_bp equ 12
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reg_ds equ 14
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reg_es equ 16
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reg_ip equ 18
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reg_cs equ 20
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reg_flags equ 22
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irp_low equ 24
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irp_hi equ 26
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%macro PUSH$ALL 0
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push es
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push ds
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push bp
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push di
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push si
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push dx
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push cx
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push bx
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push ax
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%endmacro
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%macro POP$ALL 0
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pop ax
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pop bx
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pop cx
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pop dx
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pop si
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pop di
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pop bp
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pop ds
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pop es
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%endmacro
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; I386.inc - 10/25/01 by tom ehlert
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;
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; compiling the kernel for 386 will (sometimes) change the
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; high part of (some) registers, which will be (sometimes) be used
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; later
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;
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; assumption:
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; we have never seen MSVC to use anything but eax, ecx, edx,
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; nor have we seen Borland C to use anything but eax, ebx, edx,
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; so we only protect eax, ebx or ecx, edx to conserve stack space
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;
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; to save even more stack space, we save only HIGH part of regs
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; at some expense of slower execution. it's easier anyway :-)
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;
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; WATCOM only uses FS: and GS: (using -zff and -zgf) and never
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; any high part of the 386 registers
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;
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%IF XCPU < 386
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; no need to save/restore anything
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; error 1 2 3
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%macro Protect386Registers 0
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%endmacro
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%macro Restore386Registers 0
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%endmacro
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%ELSE
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%macro Protect386Registers 0
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%ifdef WATCOM
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push fs
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push gs
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%else
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push eax
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pop ax
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%ifdef MSC
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push ecx
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pop cx
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%else ;BC
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push ebx
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pop bx
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%endif
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push edx
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pop dx
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%endif
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%endmacro
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%macro Restore386Registers 0
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%ifdef WATCOM
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pop gs
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pop fs
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%else
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push dx
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pop edx
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%ifdef MSC
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push cx
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pop ecx
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%else ;BC
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push bx
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pop ebx
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%endif
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push ax
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pop eax
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%endif
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%endmacro
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%ENDIF
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