arch.inc

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##=============================================================================
##
##	arch.inc
##
##	SH architecture assembler header file
##
##=============================================================================
#####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.
##
## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
## WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License along
## with eCos; if not, write to the Free Software Foundation, Inc.,
## 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
## with other works to produce a work based on this file, this file does not
## by itself cause the resulting work to be covered by the GNU General Public
## License. However the source code for this file must still be made available
## in accordance with section (3) of the GNU General Public License.
##
## This exception does not invalidate any other reasons why a work based on
## this file might be covered by the GNU General Public License.
##
## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
## at http://sources.redhat.com/ecos/ecos-license/
## -------------------------------------------
#####ECOSGPLCOPYRIGHTEND####
##=============================================================================
#######DESCRIPTIONBEGIN####
##
## Author(s): 	jskov
## Contributors:jskov
## Date:	2000-02-28
## Purpose:	SH definitions.
## Description:	This file contains various definitions and macros that are
##              useful for writing assembly code for the SH
##              It also includes the variant/platform assembly header file.
## Usage:
##		#include <cyg/hal/arch.inc>
##		...
##		
##
######DESCRIPTIONEND####
##
##=============================================================================

#include <cyg/hal/basetype.h>
#include <cyg/hal/sh_regs.h>

##-----------------------------------------------------------------------------
## SH entry definitions. This allows _ prefixing to change by modifying
## the CYG_LABEL_DEFN macro.

#define FUNC_START(name)	\
        .type CYG_LABEL_DEFN(name),@function;	\
        .globl CYG_LABEL_DEFN(name);		\
CYG_LABEL_DEFN(name):

#define FUNC_END(name)	\
        .globl CYG_LABEL_DEFN(name);		\
CYG_LABEL_DEFN(name):
	
#define SYM_DEF(name)	\
        .globl CYG_LABEL_DEFN(name);		\
CYG_LABEL_DEFN(name):

#define SYM_PTR_REF(name)	\
        .globl CYG_LABEL_DEFN(name);		\
$##name:	.long	CYG_LABEL_DEFN(name)

# We need this macro because the SH assembler is lacking the nice
# inline immediate constant feature of the ARM assembler. So we have
# to define constants ourselves, and sometimes we need more than one of
# the same type. This allows the symbols used to change.
#define SYM_PTR_REFn(name,n)	\
        .globl CYG_LABEL_DEFN(name);		\
$##name##n:	.long	CYG_LABEL_DEFN(name)

#include <cyg/hal/platform.inc>
	        
##-----------------------------------------------------------------------------
## SH FPU state handling
## Empty for now.

        .macro	hal_fpu_save regs
        .endm

        .macro	hal_fpu_load regs
        .endm

##-----------------------------------------------------------------------------
## CPU specific macros. These provide a common assembler interface to
## operations that may have CPU specific implementations on different
## variants of the architecture.		

	# Enable interrupts
	.macro hal_cpu_int_enable t1,t2
        stc     sr,\t1
        mov     #CYGARC_REG_SR_IMASK>>1,\t2
        shll    \t2
        not     \t2,\t2
        and     \t2,\t1
        ldc     \t1,sr
	.endm		

	# Disable interrupts
	.macro hal_cpu_int_disable t1,t2
        stc     sr,\t1
        mov     #CYGARC_REG_SR_IMASK>>1,\t2
        shll    \t2
        or      \t2,\t1
        ldc     \t1,sr
	.endm		

	# Merge the interrupt enable state of the status register in
	# \sr with the current sr.
	.macro	hal_cpu_int_merge sr,t1,t2
        stc     sr,\t1
        mov     #CYGARC_REG_SR_IMASK>>1,\t2
        shll    \t2
        and     \t2,\sr
        not     \t2,\t2
        and     \t2,\t1
        or      \sr,\t1
        ldc     \t1,sr
	.endm

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