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##=============================================================================
##
##      arch.inc
##
##      i386 assembler header file for the synthetic target
##
##=============================================================================
## ####ECOSGPLCOPYRIGHTBEGIN####                                            
## -------------------------------------------                              
## This file is part of eCos, the Embedded Configurable Operating System.   
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
##
## eCos is free software; you can redistribute it and/or modify it under    
## the terms of the GNU General Public License as published by the Free     
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## version.                                                                 
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## for more details.                                                        
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##
## As a special exception, if other files instantiate templates or use      
## macros or inline functions from this file, or you compile this file      
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## General Public License v2.                                               
##
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## ####ECOSGPLCOPYRIGHTEND####                                              
##=============================================================================
#######DESCRIPTIONBEGIN####
##
## Author(s):   jskov
## Contributors:jskov, nickg, bartv
## Date:        1999-01-20
## Purpose:     i386 definitions.
## Description: This file contains various definitions and macros that are
##              useful for writing assembly code for the i386
## Usage:
##              #include <cyg/hal/arch.inc>
##              ...
##              
##
######DESCRIPTIONEND####
##
##=============================================================================

#------------------------------------------------------------------------------
# Exception, interrupt and thread context save area layout
# The layout of this structure is also defined in "hal_arch.h", for C
# code. Do not change this without changing that (or vice versa).

        # See SYSV ABI4, i386 supplement (page 37-38)
        # http://www.sco.com/products/layered/develop/devspecs/abi386-4.pdf

        # Callee save registers (eax, ecx, and edx are scratch registers)
        .equ    i386reg_esp,            0
        .equ    i386reg_next_context,   4 # only used when dropping through...
        .equ    i386reg_ebp,            8 # ...from switch_ to load_context.
        .equ    i386reg_ebx,            12
        .equ    i386reg_esi,            16
        .equ    i386reg_edi,            20
        .equ    i386reg_interrupts,     24
        .equ    i386reg_context_size,   28

#------------------------------------------------------------------------------
# end of arch.inc