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)