59 lines
1.6 KiB
ArmAsm
59 lines
1.6 KiB
ArmAsm
/*
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* Copyright (c) 2011, 2012, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x64/crt0.S
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* Implement the _start symbol at which execution begins which performs the
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* task of initializing the standard library and executing the main function.
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*/
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.section .text
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.global _start
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.global __start
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.type _start, @function
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.type __start, @function
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_start:
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__start:
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# Set up end of the stack frame linked list.
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xorl %ebp, %ebp
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pushq %rbp # rip=0
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pushq %rbp # rbp=0
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movq %rsp, %rbp
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movq %rcx, environ # envp
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# Initialize the standard library.
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subq $8, %rsp
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pushq %rsi
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pushq %rdi
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pushq %rcx
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call initialize_standard_library
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# Run the global constructors.
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call _init
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# Run main
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popq %rdx # Note! envp is now %rdx (previously %rcx)
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popq %rdi
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popq %rsi
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addq $8, %rsp
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call main
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# Terminate the process with main's exit code.
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movl %eax, %edi
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call exit
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.size _start, .-_start
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.size __start, .-__start
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