1 ##=============================================================================
5 ## i386 assembler header file for the synthetic target
7 ##=============================================================================
8 #####ECOSGPLCOPYRIGHTBEGIN####
9 ## -------------------------------------------
10 ## This file is part of eCos, the Embedded Configurable Operating System.
11 ## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
13 ## eCos is free software; you can redistribute it and/or modify it under
14 ## the terms of the GNU General Public License as published by the Free
15 ## Software Foundation; either version 2 or (at your option) any later version.
17 ## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 ## WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 ## You should have received a copy of the GNU General Public License along
23 ## with eCos; if not, write to the Free Software Foundation, Inc.,
24 ## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 ## As a special exception, if other files instantiate templates or use macros
27 ## or inline functions from this file, or you compile this file and link it
28 ## with other works to produce a work based on this file, this file does not
29 ## by itself cause the resulting work to be covered by the GNU General Public
30 ## License. However the source code for this file must still be made available
31 ## in accordance with section (3) of the GNU General Public License.
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34 ## this file might be covered by the GNU General Public License.
36 ## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37 ## at http://sources.redhat.com/ecos/ecos-license/
38 ## -------------------------------------------
39 #####ECOSGPLCOPYRIGHTEND####
40 ##=============================================================================
41 #######DESCRIPTIONBEGIN####
44 ## Contributors:jskov, nickg, bartv
46 ## Purpose: i386 definitions.
47 ## Description: This file contains various definitions and macros that are
48 ## useful for writing assembly code for the i386
50 ## #include <cyg/hal/arch.inc>
54 ######DESCRIPTIONEND####
56 ##=============================================================================
58 #------------------------------------------------------------------------------
59 # Exception, interrupt and thread context save area layout
60 # The layout of this structure is also defined in "hal_arch.h", for C
61 # code. Do not change this without changing that (or vice versa).
63 # See SYSV ABI4, i386 supplement (page 37-38)
64 # http://www.sco.com/products/layered/develop/devspecs/abi386-4.pdf
66 # Callee save registers (eax, ecx, and edx are scratch registers)
68 .equ i386reg_next_context, 4 # only used when dropping through...
69 .equ i386reg_ebp, 8 # ...from switch_ to load_context.
73 .equ i386reg_interrupts, 24
74 .equ i386reg_context_size, 28
76 #------------------------------------------------------------------------------