Subversion Repositories openrisc_me

/* Startup code for M68HC11.

   Copyright (C) 1999, 2000, 2002 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 2, or (at your option) any

later version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file with other programs, and to distribute

those programs without any restriction coming from the use of this

file.  (The General Public License restrictions do apply in other

respects; for example, they cover modification of the file, and

distribution when not linked into another program.)

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.

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

along with this program; see the file COPYING.  If not, write to

the Free Software Foundation, 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

/* As a special exception, if you link this library with other files,

   some of which are compiled with GCC, to produce an executable,

   this library does not by itself cause the resulting executable

   to be covered by the GNU General Public License.

   This exception does not however invalidate any other reasons why

   the executable file might be covered by the GNU General Public License.  */

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

; startup code

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

        .file   "crt0.s"

#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