mirror of
https://github.com/autc04/Retro68.git
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80 lines
1.7 KiB
ArmAsm
80 lines
1.7 KiB
ArmAsm
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/*
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* crt0 startup code for user programs running under Cygmon
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*
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* Copyright (c) 1998, 2000 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#define _S2(P,X) P ## X
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#define _S1(P,X) _S2(P,X)
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#define SYM(X) _S1(__USER_LABEL_PREFIX__,X)
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.data
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.align 8
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SYM(environ):
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.long 0
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SYM(argc):
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.long 0
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.text
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.align 4
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.globl __start
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__start:
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/* see if the stack is already setup. if not, then default
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* to using the value of %sp as set by the ROM monitor
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*/
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movl $__stack, %eax
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testl %eax, %eax
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jz 1f
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movl %eax, %esp
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1:
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mov $0, %ebp
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movl $__bss_start, %edi
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movl $__bss_end, %ecx
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subl %edi, %ecx
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xorl %eax, %eax
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rep; stosb
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pushl $SYM(__sigtramp)
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pushl $0
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call SYM(__install_signal_handler)
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popl %eax
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pushl $SYM(__do_global_dtors)
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call SYM(atexit)
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popl %eax
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call SYM(__do_global_ctors)
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pushl $SYM(argc)
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call SYM(__get_program_arguments)
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popl %ecx
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movl SYM(argc), %ecx
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pushl %eax
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pushl %ecx
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call SYM(main)
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popl %ecx
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popl %edx
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/* call exit from the C library so atexit gets called, and the
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* C++ destructors get run. This calls our exit routine below
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* when it's done.
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*/
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pushl %eax
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call SYM(exit)
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3:
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jmp 3b
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