source: rtems/c/src/lib/start/sh/start.s @ f8b27df9

/*
 *  Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and
 *           Bernd Becker (becker@faw.uni-ulm.de)
 *
 *  COPYRIGHT (c) 1997-1998, FAW Ulm, Germany
 *
 *  This program 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.
 *
 *
 *  COPYRIGHT (c) 1998.
 *  On-Line Applications Research Corporation (OAR).
 *  Copyright assigned to U.S. Government, 1994.
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id$
 */

#include "asm.h"

        BEGIN_CODE
        PUBLIC(start)
SYM (start):
        ! install the stack pointer
        mov.l   stack_k,r15

        ! zero out bss
        mov.l   edata_k,r0
        mov.l   end_k,r1
        mov     #0,r2
start_l:
        mov.l   r2,@r0
        add     #4,r0
        cmp/ge  r0,r1
        bt      start_l

        ! copy the vector table from rom to ram
        mov.l   vects_k,r7      ! vectab
        mov     #0,r2           ! address of boot vector table
        mov     #0,r3           | number of bytes copied
        mov.w   vects_size,r6   ! size of entries in vectab
0:
        mov.l   @r2+,r1
        mov.l   r1,@r7
        add     #4,r7
        add     #1,r3
        cmp/hi  r6,r3
        bf      0b

        mov.l   vects_k,r8      ! update vbr to point to vectab
        ldc     r8,vbr

        ! call the mainline     
        mov.l   main_k,r0
        jsr     @r0
        or      r0,r0

        ! call exit
        mov     r0,r4
        mov.l   exit_k,r0
        jsr     @r0
        or      r0,r0

        END_CODE

        .align 2
stack_k:
        .long   _stack  
edata_k:
        .long   _edata
end_k:
        .long   _end
main_k:
        .long   _main
exit_k:
        .long   _exit

vects_k:
        .long   _vectab
vects_size:
        .word   255

#ifdef __ELF__
        .section .stack,"aw"
#else
        .section .stack
#endif
_stack: .long   0xdeaddead