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 * $FreeBSD$ 23 */ 24 25#include <machine/asm.h> 26__FBSDID("$FreeBSD$"); 27 28 .text 29 .align 4 30 .globl _start 31 .type _start, @function 32_start: 33 .cfi_startproc 34 .cfi_undefined %eip 35 popl %esi # Pop argc 36 .cfi_def_cfa_offset -4 37 movl %esp,%edi # argv starts at stack top 38 xorl %ebp,%ebp 39 pushl %ebp 40 .cfi_def_cfa_offset 0 41 movl %esp,%ebp 42 .cfi_offset %ebp,-4 43 .cfi_def_cfa_register %ebp 44 andl $0xfffffff0,%esp # align stack 45 46#ifdef GCRT 47 subl $4,%esp # Align stack for 7 arguments 48 pushl $etext 49 pushl $eprol 50eprol: 51#else 52 subl $12,%esp # Align stack for 5 arguments 53#endif /* GCRT */ 54 55#ifdef PIC 56 calll 1f 571: popl %ebx 58 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 59 leal main@GOTOFF(%ebx),%eax 60 pushl %eax 61#else 62 pushl $main 63#endif /* PIC */ 64 65 pushl %edx # rtld cleanup 66 /* env = argv + argc + 1 */ 67 movl %edi,%eax # env = argv 68 movl %esi,%ecx 69 shll $2,%ecx # argc * 4 70 addl %ecx,%eax # env += argc 71 addl $4,%eax # env += 1 72 pushl %eax # env 73 pushl %edi # argv 74 pushl %esi # argc 75 76#ifdef GCRT 77 /* 78 * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext); 79 */ 80 calll __libc_start1_gcrt 81#else 82 /* 83 * __libc_start1(argc, argv, env, cleanup, main); 84 */ 85#ifdef PIC 86 calll __libc_start1@PLT 87#else 88 calll __libc_start1 89#endif 90#endif /* GCRT */ 91 int3 92 .cfi_endproc 93 .size _start, . - _start 94 95 .section .note.GNU-stack,"",%progbits 96