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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 Red Hat, 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

## Software Foundation; either version 2 or (at your option) any later version.

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## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

## for more details.

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## You should have received a copy of the GNU General Public License along

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## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

##

## As a special exception, if other files instantiate templates or use macros

## or inline functions from this file, or you compile this file and link it

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## License. However the source code for this file must still be made available

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## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

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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 

##              ...

##

##

######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