1/*- 2 * Copyright 2009 Konstantin Belousov. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 12 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 14 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 15 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 16 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 17 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 18 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 19 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 20 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 21 */ 22 23#include <machine/asm.h> 24__FBSDID("$FreeBSD$"); 25 26 .text 27 .align 4 28 .globl _start 29 .type _start, @function 30_start: 31 .cfi_startproc 32 .cfi_undefined %eip 33 popl %esi # Pop argc 34 .cfi_def_cfa_offset -4 35 movl %esp,%edi # argv starts at stack top 36 xorl %ebp,%ebp 37 pushl %ebp 38 .cfi_def_cfa_offset 0 39 movl %esp,%ebp 40 .cfi_offset %ebp,-4 41 .cfi_def_cfa_register %ebp 42 andl $0xfffffff0,%esp # align stack 43 44#ifdef GCRT 45 subl $4,%esp # Align stack for 7 arguments 46 pushl $etext 47 pushl $eprol 48eprol: 49#else 50 subl $12,%esp # Align stack for 5 arguments 51#endif /* GCRT */ 52 53#ifdef PIC 54 calll 1f 551: popl %ebx 56 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 57 leal main@GOTOFF(%ebx),%eax 58 pushl %eax 59#else 60 pushl $main 61#endif /* PIC */ 62 63 pushl %edx # rtld cleanup 64 /* env = argv + argc + 1 */ 65 movl %edi,%eax # env = argv 66 movl %esi,%ecx 67 shll $2,%ecx # argc * 4 68 addl %ecx,%eax # env += argc 69 addl $4,%eax # env += 1 70 pushl %eax # env 71 pushl %edi # argv 72 pushl %esi # argc 73 74#ifdef GCRT 75 /* 76 * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext); 77 */ 78 calll __libc_start1_gcrt 79#else 80 /* 81 * __libc_start1(argc, argv, env, cleanup, main); 82 */ 83#ifdef PIC 84 calll __libc_start1@PLT 85#else 86 calll __libc_start1 87#endif 88#endif /* GCRT */ 89 int3 90 .cfi_endproc 91 .size _start, . - _start 92 93 .section .note.GNU-stack,"",%progbits 94