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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 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     
## 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 with eCos; if not, write to the Free Software Foundation, Inc.,    
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 v2.                                               
##
## This exception does not invalidate any other reasons why a work based    
## on this file might be covered by the GNU General Public 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