Subversion Repositories openrisc_2011-10-31

/* Copyright (c) 2001, 2009 Xilinx, Inc.  All rights reserved. 
   
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:
   
   1.  Redistributions source code must retain the above copyright notice,
   this list of conditions and the following disclaimer. 
   
   2.  Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution. 
   
   3.  Neither the name of Xilinx nor the names of its contributors may be
   used to endorse or promote products derived from this software without
   specific prior written permission. 
   
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS
   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

        .globl _crtinit
        .align 2
        .ent _crtinit
        .type _crtinit, @function
_crtinit:
        addi    r1, r1, -20                     /* Save Link register    */
        swi     r15, r1, 0

        addi    r6, r0, __sbss_start            /* clear SBSS */
        addi    r7, r0, __sbss_end      
        rsub    r18, r6, r7             
        blei    r18, .Lendsbss

.Lloopsbss:     
        swi     r0, r6, 0
        addi    r6, r6, 4
        rsub    r18, r6, r7
        bgti    r18, .Lloopsbss
.Lendsbss:

        addi    r6, r0, __bss_start             /* clear BSS */
        addi    r7, r0, __bss_end               
        rsub    r18, r6, r7             
        blei    r18, .Lendbss
.Lloopbss:      
        swi     r0, r6, 0
        addi    r6, r6, 4
        rsub    r18, r6, r7
        bgti    r18, .Lloopbss
.Lendbss:

        brlid   r15, _program_init              /* Initialize the program  */
        nop

        brlid   r15, __init                     /* Invoke language initialization functions */
        nop
    
        addi    r6, r0, 0                       /* Initialize argc = 1 and argv = NULL and envp = NULL  */
        addi    r7, r0, 0                       
        brlid   r15, main                       /* Execute the program */
        addi    r5, r0, 0

        addik   r19, r3, 0                      /* Save return value */
    
        brlid   r15, __fini                     /* Invoke language cleanup functions */
        nop
    
        brlid   r15, _program_clean             /* Cleanup the program  */
        nop

        lw      r15, r1, r0                     /* Return back to CRT   */

        addik   r3, r19, 0                      /* Restore return value */
        rtsd    r15, 8
        addi    r1, r1, 20
        .end _crtinit