| 1 | /* |
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| 2 | * crt0 startup code for user programs running under Cygmon |
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| 3 | * |
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| 4 | * Copyright (c) 1998, 2000 Cygnus Support |
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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 | #define _S2(P,X) P ## X |
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| 18 | #define _S1(P,X) _S2(P,X) |
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| 19 | #define SYM(X) _S1(__USER_LABEL_PREFIX__,X) |
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| 20 | |
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| 21 | .data |
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| 22 | .align 8 |
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| 23 | SYM(environ): |
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| 24 | .long 0 |
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| 25 | |
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| 26 | SYM(argc): |
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| 27 | .long 0 |
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| 28 | |
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| 29 | .text |
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| 30 | .align 4 |
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| 31 | |
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| 32 | .globl __start |
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| 33 | __start: |
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| 34 | /* see if the stack is already setup. if not, then default |
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| 35 | * to using the value of %sp as set by the ROM monitor |
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| 36 | */ |
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| 37 | movl $__stack, %eax |
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| 38 | testl %eax, %eax |
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| 39 | jz 1f |
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| 40 | movl %eax, %esp |
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| 41 | 1: |
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| 42 | mov $0, %ebp |
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| 43 | |
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| 44 | movl $__bss_start, %edi |
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| 45 | movl $__bss_end, %ecx |
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| 46 | subl %edi, %ecx |
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| 47 | xorl %eax, %eax |
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| 48 | rep; stosb |
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| 49 | |
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| 50 | pushl $SYM(__sigtramp) |
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| 51 | pushl $0 |
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| 52 | call SYM(__install_signal_handler) |
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| 53 | popl %eax |
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| 54 | |
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| 55 | pushl $SYM(__do_global_dtors) |
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| 56 | call SYM(atexit) |
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| 57 | popl %eax |
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| 58 | |
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| 59 | call SYM(__do_global_ctors) |
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| 60 | |
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| 61 | pushl $SYM(argc) |
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| 62 | call SYM(__get_program_arguments) |
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| 63 | popl %ecx |
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| 64 | |
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| 65 | movl SYM(argc), %ecx |
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| 66 | pushl %eax |
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| 67 | pushl %ecx |
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| 68 | call SYM(main) |
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| 69 | popl %ecx |
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| 70 | popl %edx |
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| 71 | |
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| 72 | /* call exit from the C library so atexit gets called, and the |
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| 73 | * C++ destructors get run. This calls our exit routine below |
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| 74 | * when it's done. |
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| 75 | */ |
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| 76 | pushl %eax |
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| 77 | call SYM(exit) |
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| 78 | 3: |
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| 79 | jmp 3b |
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