Subversion Repositories openrisc_2011-10-31

/* crt0.S -- startup file for moxie

 *

 * Copyright (c) 2008, 2009  Anthony Green

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

        .globl  __start

        .weak   _start

        .text

        .type   __start,@function

__start:

_start:

        ldi.l   $sp, _stack     /* load up stack pointer */

        ldi.l   $fp, 0x0        /* zero fp to allow unwinders to stop */

        /* zero the bss area */

        dec     $sp, 12

        ldi.l   $r0, __bss_start__

        ldi.l   $r1, __bss_end__

        sub.l   $r1, $r0

        sto.l   8($sp), $r1

        ldi.l   $r1, 0

        jsra    memset

        inc     $sp, 12

        /* Call _init to invoke static constructors, etc.  */

        jsra    _init

        /* Call _fini at exit time for static destructors.  */

        ldi.l   $r0, _fini

        jsra    atexit

        /* Set argc and argv.  These are populated by the simulator.  */

        lda.l   $r0, 0x4

        ldi.l   $r1, 0x8

        jsra    main

        jsra    exit

.Lend:

        .size   __start,(.Lend-__start)