Last change
on this file since 548 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:
1.6 KB
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Rev | Line | |
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[444] | 1 | /* |
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| 2 | * crt0.S for the Blackfin processor |
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| 3 | * |
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| 4 | * Copyright (C) 2006 Analog Devices, Inc. |
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| 5 | * |
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| 6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 7 | * and license this software and its documentation for any purpose, provided |
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| 8 | * that existing copyright notices are retained in all copies and that this |
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| 9 | * notice is included verbatim in any distributions. No written agreement, |
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| 10 | * license, or royalty fee is required for any of the authorized uses. |
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| 11 | * Modifications to this software may be copyrighted by their authors |
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| 12 | * and need not follow the licensing terms described here, provided that |
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| 13 | * the new terms are clearly indicated on the first page of each file where |
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| 14 | * they apply. |
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| 15 | */ |
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| 16 | |
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| 17 | .text |
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| 18 | .align 2 |
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| 19 | |
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| 20 | .global __start |
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| 21 | __start: |
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| 22 | |
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| 23 | /* Start by setting up a stack */ |
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| 24 | link 0xc; |
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| 25 | /* Zero the memory in the .bss section. */ |
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| 26 | |
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| 27 | p0.l = __edata; |
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| 28 | p0.h = __edata; |
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| 29 | p1.l = __end; |
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| 30 | p1.h = __end; |
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| 31 | p1 -= p0; |
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| 32 | r0 = 0; |
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| 33 | lsetup (L$L$clear_bss, L$L$clear_bss) lc0 = p1; |
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| 34 | L$L$clear_bss: |
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| 35 | B [p0++] = r0; |
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| 36 | |
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| 37 | #ifdef __BFIN_FDPIC__ |
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| 38 | /* Set up GOT pointer. */ |
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| 39 | P0.L = __ROFIXUP_END__; |
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| 40 | P0.H = __ROFIXUP_END__; |
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| 41 | P4 = [P0 - 4]; |
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| 42 | #endif |
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| 43 | |
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| 44 | /* Need to set up standard file handles */ |
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| 45 | /* Parse string at r1 */ |
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| 46 | |
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| 47 | p0.l = __init; |
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| 48 | p0.h = __init; |
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| 49 | P3 = P4; |
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| 50 | call (p0) |
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| 51 | |
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| 52 | p0.l = _atexit; |
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| 53 | p0.h = _atexit; |
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| 54 | #ifdef __BFIN_FDPIC__ |
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| 55 | r0 = [P4 + __fini@FUNCDESC_GOT17M4]; |
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| 56 | P3 = P4; |
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| 57 | #else |
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| 58 | r0.l = __fini; |
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| 59 | r0.h = __fini; |
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| 60 | #endif |
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| 61 | call (p0) |
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| 62 | |
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| 63 | p0.l = ___setup_argv_and_call_main; |
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| 64 | p0.h = ___setup_argv_and_call_main; |
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| 65 | P3 = P4; |
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| 66 | call (p0) |
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| 67 | |
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| 68 | p0.l = _exit; |
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| 69 | p0.h = _exit; |
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| 70 | P3 = P4; |
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| 71 | jump (p0) /* Should not return. */ |
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| 72 | nop; |
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