Subversion Repositories openrisc_2011-10-31

/* Startup code for M68HC11.

   Copyright (C) 1999, 2000, 2002, 2008, 2009 Free Software Foundation, Inc.

This file 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 3, or (at your option) any

later version.

This file 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

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

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

.  */

;-----------------------------------------

; startup code

;-----------------------------------------

#ifdef __HAVE_SHORT_INT__

        .mode mshort

#else

        .mode mlong

#endif

#if defined(__USE_RTC__) && defined(mc68hc12)

        .macro jsr name

        call    \name

        .endm

#endif

;;

;;

;; The linker concatenate the .install* sections in the following order:

;;

;; .install0    Setup the stack pointer

;; .install1    Place holder for applications

;; .install2    Optional installation of data section in memory

;; .install3    Place holder for applications

;; .install4    Invokes the main

;;

        .sect   .install0,"ax",@progbits

        .globl _start

_start:

;;

;; At this step, the stack is not initialized and interrupts are masked.

;; Applications only have 64 cycles to initialize some registers.

;;

;; To have a generic/configurable startup, initialize the stack to

;; the end of some memory region.  The _stack symbol is defined by

;; the linker.

;;

        lds     #_stack

        .sect   .install2,"ax",@progbits

;;

;; Call a specific initialization operation.  The default is empty.

;; It can be overridden by applications.  It is intended to initialize

;; the 68hc11 registers.  Function prototype is:

;;

;;      int __premain(void);

;;

        jsr     __premain

;;

;;

;;

        .sect   .install4,"ax",@progbits

        jsr     main

fatal:

        jsr     exit

        bra fatal

;-----------------------------------------

; end startup code

;-----------------------------------------

;; Force loading of data section mapping and bss clear

        .2byte  __map_data_section

        .2byte  __init_bss_section