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Last change
on this file since 612 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.5 KB
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| Rev | Line | |
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| [444] | 1 | /* Initial boot |
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| 2 | * |
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| 3 | * Copyright (c) 2006 CodeSourcery Inc |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |
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| 16 | #include "asm.h" |
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| 17 | .text |
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| 18 | |
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| 19 | .extern __stack |
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| 20 | .extern __heap_end |
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| 21 | .weak __heap_end |
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| 22 | .extern __start1 |
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| 23 | |
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| 24 | /* __reset should cause a HALT in a hosted executable and |
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| 25 | fall into __start for an unhosted executable. The user is |
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| 26 | free to override this with their own declaration. */ |
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| 27 | .globl __reset |
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| 28 | .weak __reset |
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| 29 | __reset: |
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| 30 | #if HOSTED |
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| 31 | HALT |
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| 32 | #endif |
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| 33 | |
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| 34 | .globl __start |
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| 35 | __start: |
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| 36 | /* Initialize stack */ |
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| 37 | move.l IMM(__stack), sp |
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| 38 | move.l IMM(0), fp |
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| 39 | move.l IMM(__heap_end), d1 |
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| 40 | #if HOSTED |
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| 41 | /* INIT_SIM syscall. Allows changing sp & d1. */ |
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| 42 | move.l IMM(1),d0 |
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| 43 | |
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| 44 | /* The semihosting sequence is 'nop; halt;sentinel' aligned to |
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| 45 | a 4 byte boundary. The sentinel is an ill formed instruction |
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| 46 | (movec %sp,0). The debugger will adjust the pc, so it is never |
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| 47 | executed. */ |
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| 48 | .balignw 4,0x4e71 |
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| 49 | nop |
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| 50 | halt |
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| 51 | .long 0x4e7bf000 |
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| 52 | #endif |
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| 53 | move.l d1,sp@- |
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| 54 | move.l fp,sp@- /* Dummy return address */ |
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| 55 | jmp __start1 |
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| 56 | |
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