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/* Initial boot
*
* Copyright (c) 2006 CodeSourcery Inc
*
* 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.
*/
#include "asm.h"
.text
.extern __stack
.extern __heap_end
.weak __heap_end
.extern __start1
/* __reset should cause a HALT in a hosted executable and
fall into __start for an unhosted executable. The user is
free to override this with their own declaration. */
.globl __reset
.weak __reset
__reset:
#if HOSTED
HALT
#endif
.globl __start
__start:
/* Initialize stack */
move.l IMM(__stack), sp
move.l IMM(0), fp
move.l IMM(__heap_end), d1
#if HOSTED
/* INIT_SIM syscall. Allows changing sp & d1. */
move.l IMM(1),d0
/* The semihosting sequence is 'nop; halt;sentinel' aligned to
a 4 byte boundary. The sentinel is an ill formed instruction
(movec %sp,0). The debugger will adjust the pc, so it is never
executed. */
.balignw 4,0x4e71
nop
halt
.long 0x4e7bf000
#endif
move.l d1,sp@-
move.l fp,sp@- /* Dummy return address */
jmp __start1
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