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Last change
on this file since 645 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.8 KB
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| 1 | ##============================================================================== |
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| 2 | ## |
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| 3 | ## crt0-eval.S |
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| 4 | ## |
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| 5 | ## MN10300 Series Evaluation Board C startup code |
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| 6 | ## |
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| 7 | ##============================================================================== |
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| 8 | ######COPYRIGHTBEGIN#### |
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| 9 | ## |
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| 10 | ## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions |
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| 11 | ## |
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| 12 | ## The authors hereby grant permission to use, copy, modify, distribute, |
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| 13 | ## and license this software and its documentation for any purpose, provided |
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| 14 | ## that existing copyright notices are retained in all copies and that this |
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| 15 | ## notice is included verbatim in any distributions. No written agreement, |
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| 16 | ## license, or royalty fee is required for any of the authorized uses. |
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| 17 | ## Modifications to this software may be copyrighted by their authors |
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| 18 | ## and need not follow the licensing terms described here, provided that |
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| 19 | ## the new terms are clearly indicated on the first page of each file where |
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| 20 | ## they apply. |
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| 21 | ## |
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| 22 | ######COPYRIGHTEND#### |
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| 23 | |
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| 24 | ##------------------------------------------------------------------------------ |
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| 25 | |
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| 26 | .file "crt0-eval.S" |
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| 27 | |
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| 28 | ##------------------------------------------------------------------------------ |
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| 29 | ## Startup code |
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| 30 | |
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| 31 | .equ DRAM_TOP,0x48100000 |
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| 32 | |
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| 33 | .text |
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| 34 | |
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| 35 | .globl __start |
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| 36 | __start: |
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| 37 | # Set up stack. Leave 4K at top for use by Cygmon. |
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| 38 | |
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| 39 | mov DRAM_TOP - 0x1000,a0 |
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| 40 | sub 8,a0 |
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| 41 | mov a0,sp |
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| 42 | |
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| 43 | # Clear BSS |
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| 44 | |
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| 45 | mov __bss_start,a0 |
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| 46 | mov _end,a1 |
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| 47 | |
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| 48 | cmp a0,a1 |
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| 49 | beq 8f |
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| 50 | clr d0 |
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| 51 | 1: |
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| 52 | movbu d0,(a0) |
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| 53 | inc a0 |
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| 54 | cmp a0,a1 |
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| 55 | bne 1b |
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| 56 | 8: |
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| 57 | # Call constructors |
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| 58 | |
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| 59 | .extern ___main |
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| 60 | call ___main,[],0 |
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| 61 | |
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| 62 | # Call main |
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| 63 | clr d0 |
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| 64 | clr d1 |
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| 65 | mov d0,(4,sp) |
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| 66 | |
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| 67 | 9: |
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| 68 | or 0x0800,psw # Enable interrupts |
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| 69 | |
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| 70 | .extern _main |
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| 71 | call _main,[],0 |
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| 72 | |
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| 73 | .extern __exit |
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| 74 | call __exit,[],0 |
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| 75 | |
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| 76 | # bra 9b # Loop if we return |
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| 77 | |
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| 78 | |
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| 79 | |
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| 80 | ##------------------------------------------------------------------------------ |
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| 81 | ## end of crt0-eval.S |
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| 82 | |
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