mirror of
https://github.com/freebsd/freebsd-src
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92 lines
2.3 KiB
ArmAsm
92 lines
2.3 KiB
ArmAsm
/*-
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* Copyright 2009 Konstantin Belousov.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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.text
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.align 4
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.globl _start
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.type _start, @function
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_start:
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.cfi_startproc
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.cfi_undefined %eip
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popl %esi # Pop argc
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.cfi_def_cfa_offset -4
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movl %esp,%edi # argv starts at stack top
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xorl %ebp,%ebp
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pushl %ebp
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.cfi_def_cfa_offset 0
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movl %esp,%ebp
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.cfi_offset %ebp,-4
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.cfi_def_cfa_register %ebp
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andl $0xfffffff0,%esp # align stack
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#ifdef GCRT
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subl $4,%esp # Align stack for 7 arguments
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pushl $etext
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pushl $eprol
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eprol:
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#else
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subl $12,%esp # Align stack for 5 arguments
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#endif /* GCRT */
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#ifdef PIC
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calll 1f
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1: popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
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leal main@GOTOFF(%ebx),%eax
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pushl %eax
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#else
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pushl $main
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#endif /* PIC */
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pushl %edx # rtld cleanup
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/* env = argv + argc + 1 */
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movl %edi,%eax # env = argv
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movl %esi,%ecx
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shll $2,%ecx # argc * 4
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addl %ecx,%eax # env += argc
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addl $4,%eax # env += 1
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pushl %eax # env
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pushl %edi # argv
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pushl %esi # argc
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#ifdef GCRT
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/*
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* __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext);
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*/
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calll __libc_start1_gcrt
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#else
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/*
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* __libc_start1(argc, argv, env, cleanup, main);
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*/
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#ifdef PIC
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calll __libc_start1@PLT
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#else
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calll __libc_start1
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#endif
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#endif /* GCRT */
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int3
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.cfi_endproc
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.size _start, . - _start
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.section .note.GNU-stack,"",%progbits
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