/*    FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter.    This file is part of the FreeRTOS distribution.    FreeRTOS 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 of the License, or    (at your option) any later version.    FreeRTOS 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 FreeRTOS; if not, write to the Free Software    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA    A special exception to the GPL can be applied should you wish to distribute    a combined work that includes FreeRTOS, without being obliged to provide    the source code for any proprietary components.  See the licensing section    of http://www.FreeRTOS.org for full details of how and when the exception    can be applied.    ***************************************************************************    See http://www.FreeRTOS.org for documentation, latest information, license    and contact details.  Please ensure to read the configuration and relevant    port sections of the online documentation.    ****************************************************************************/  .title "crt0.S"  .extern main  .extern __stack  .extern __bss_start  .extern __text_start  .extern init_main  .equ    MCF5XXX_RAMBAR_SPV,   0x00000200  .equ    MCF5XXX_RAMBAR_V,     0x00000001  .global start  .align  4debug:  .word   0x2C80    /* write to CSR */  .word   0x0010  .word   0x0400  .word   0x0000start:  /* disable all interrupts on startup. */  move.w  #0x2700, sr  /* prepare internal SRAM. */  move.l  #__SRAM, d0  ori.l   #( MCF5XXX_RAMBAR_SPV | MCF5XXX_RAMBAR_V ), d0  movec   d0, rambar  /* prepare stack and frame pointer. */  move.l  #__stack, sp  link    a6, #-8  /* initialize hardware. */  jsr     init_main  /* zero out the bss section. */  move.l  #__bss_start, d1  move.l  #_end, d0  cmp.l   d0, d1  jbeq    3f  move.l  d1, a0  sub.l   d1, d0  subq.l  #1, d02:  clr.b   (a0)+  subq.l  #1, d0  jbpl    2b3:  /* Relocate the data section. */  move.l  #__data_load_start, %a0         /* .data in ROM */  move.l  #copy_start, %a1                /* .data in RAM */  /* Test if the two sections overlap. This is the case when we are working   * with the debugger and the debugger loads the .data section.   */  cmpa.l  %a0, %a1  beq     2f1:  /* Have we already copied everything. */  cmpa.l  #__data_load_end, %a0  beq     2f  move.b  (%a0)+, (%a1)+  bra     1b2:  /* C library */  move.l  #__FINI_SECTION__, -(%sp)  jsr     atexit  jsr     __INIT_SECTION__  /* call main(int argc, char *argv[] */  move.l  #0, -(sp)  move.l  #0, -(sp)  move.l  #0, -(sp)  jsr     main  lea     (sp, 12), %sp  /* stop on exit from main. */1:  halt