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jeremybenn |
/*
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FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter.
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License** as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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***************************************************************************
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* *
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* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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* *
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* This is a concise, step by step, 'hands on' guide that describes both *
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* general multitasking concepts and FreeRTOS specifics. It presents and *
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* explains numerous examples that are written using the FreeRTOS API. *
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* Full source code for all the examples is provided in an accompanying *
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* .zip file. *
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* *
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***************************************************************************
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***************************************************************************
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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.title "crt0.S"
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.extern main
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.extern __stack
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.extern __bss_start
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.extern __text_start
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.extern init_main
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.equ MCF5XXX_RAMBAR_SPV, 0x00000200
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.equ MCF5XXX_RAMBAR_V, 0x00000001
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.global start
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.align 4
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debug:
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.word 0x2C80 /* write to CSR */
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.word 0x0010
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.word 0x0400
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.word 0x0000
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start:
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/* disable all interrupts on startup. */
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move.w #0x2700, sr
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/* prepare internal SRAM. */
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move.l #__SRAM, d0
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ori.l #( MCF5XXX_RAMBAR_SPV | MCF5XXX_RAMBAR_V ), d0
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movec d0, rambar
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/* prepare stack and frame pointer. */
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move.l #__stack, sp
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link a6, #-8
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/* initialize hardware. */
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jsr init_main
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/* zero out the bss section. */
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move.l #__bss_start, d1
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move.l #_end, d0
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cmp.l d0, d1
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jbeq 3f
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move.l d1, a0
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sub.l d1, d0
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subq.l #1, d0
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2:
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clr.b (a0)+
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subq.l #1, d0
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jbpl 2b
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3:
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/* Relocate the data section. */
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move.l #__data_load_start, %a0 /* .data in ROM */
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move.l #copy_start, %a1 /* .data in RAM */
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/* Test if the two sections overlap. This is the case when we are working
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* with the debugger and the debugger loads the .data section.
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*/
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cmpa.l %a0, %a1
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beq 2f
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1:
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/* Have we already copied everything. */
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cmpa.l #__data_load_end, %a0
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beq 2f
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move.b (%a0)+, (%a1)+
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bra 1b
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2:
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/* C library */
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move.l #__FINI_SECTION__, -(%sp)
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jsr atexit
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jsr __INIT_SECTION__
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/* call main(int argc, char *argv[] */
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move.l #0, -(sp)
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move.l #0, -(sp)
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move.l #0, -(sp)
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jsr main
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lea (sp, 12), %sp
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/* stop on exit from main. */
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1:
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halt
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