| /* 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 |
| |
