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 .text 25 .align 4 26 .globl _start 27 .type _start, @function 28_start: 29 .cfi_startproc 30 .cfi_undefined %eip 31 popl %esi # Pop argc 32 .cfi_def_cfa_offset -4 33 movl %esp,%edi # argv starts at stack top 34 xorl %ebp,%ebp 35 pushl %ebp 36 .cfi_def_cfa_offset 0 37 movl %esp,%ebp 38 .cfi_offset %ebp,-4 39 .cfi_def_cfa_register %ebp 40 andl $0xfffffff0,%esp # align stack 41 42#ifdef GCRT 43 subl $4,%esp # Align stack for 7 arguments 44 pushl $etext 45 pushl $eprol 46eprol: 47#else 48 subl $12,%esp # Align stack for 5 arguments 49#endif /* GCRT */ 50 51#ifdef PIC 52 calll 1f 531: popl %ebx 54 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 55 leal main@GOTOFF(%ebx),%eax 56 pushl %eax 57#else 58 pushl $main 59#endif /* PIC */ 60 61 pushl %edx # rtld cleanup 62 /* env = argv + argc + 1 */ 63 movl %edi,%eax # env = argv 64 movl %esi,%ecx 65 shll $2,%ecx # argc * 4 66 addl %ecx,%eax # env += argc 67 addl $4,%eax # env += 1 68 pushl %eax # env 69 pushl %edi # argv 70 pushl %esi # argc 71 72#ifdef GCRT 73 /* 74 * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext); 75 */ 76 calll __libc_start1_gcrt 77#else 78 /* 79 * __libc_start1(argc, argv, env, cleanup, main); 80 */ 81#ifdef PIC 82 calll __libc_start1@PLT 83#else 84 calll __libc_start1 85#endif 86#endif /* GCRT */ 87 int3 88 .cfi_endproc 89 .size _start, . - _start 90 91 .section .note.GNU-stack,"",%progbits 92