1302af795SEd Maste/*- 2302af795SEd Maste * Copyright 2009 Konstantin Belousov. 3302af795SEd Maste * All rights reserved. 4302af795SEd Maste * 5302af795SEd Maste * Redistribution and use in source and binary forms, with or without 6302af795SEd Maste * modification, are permitted provided that the following conditions 7302af795SEd Maste * are met: 8302af795SEd Maste * 1. Redistributions of source code must retain the above copyright 9302af795SEd Maste * notice, this list of conditions and the following disclaimer. 10302af795SEd Maste * 11302af795SEd Maste * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 12302af795SEd Maste * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 13302af795SEd Maste * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 14302af795SEd Maste * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 15302af795SEd Maste * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 16302af795SEd Maste * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 17302af795SEd Maste * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 18302af795SEd Maste * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 19302af795SEd Maste * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 20302af795SEd Maste * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 21302af795SEd Maste */ 22302af795SEd Maste 23302af795SEd Maste#include <machine/asm.h> 24302af795SEd Maste .text 25302af795SEd Maste .align 4 26302af795SEd Maste .globl _start 27302af795SEd Maste .type _start, @function 28302af795SEd Maste_start: 29302af795SEd Maste .cfi_startproc 30*d744a37aSDmitry Chagin .cfi_undefined %eip 31*d744a37aSDmitry Chagin popl %esi # Pop argc 32*d744a37aSDmitry Chagin .cfi_def_cfa_offset -4 33*d744a37aSDmitry Chagin movl %esp,%edi # argv starts at stack top 34302af795SEd Maste xorl %ebp,%ebp 35302af795SEd Maste pushl %ebp 36*d744a37aSDmitry Chagin .cfi_def_cfa_offset 0 37302af795SEd Maste movl %esp,%ebp 38*d744a37aSDmitry Chagin .cfi_offset %ebp,-4 39302af795SEd Maste .cfi_def_cfa_register %ebp 40302af795SEd Maste andl $0xfffffff0,%esp # align stack 41*d744a37aSDmitry Chagin 42*d744a37aSDmitry Chagin#ifdef GCRT 43*d744a37aSDmitry Chagin subl $4,%esp # Align stack for 7 arguments 44*d744a37aSDmitry Chagin pushl $etext 45*d744a37aSDmitry Chagin pushl $eprol 46*d744a37aSDmitry Chagineprol: 47*d744a37aSDmitry Chagin#else 48*d744a37aSDmitry Chagin subl $12,%esp # Align stack for 5 arguments 49*d744a37aSDmitry Chagin#endif /* GCRT */ 50*d744a37aSDmitry Chagin 51*d744a37aSDmitry Chagin#ifdef PIC 52*d744a37aSDmitry Chagin calll 1f 53*d744a37aSDmitry Chagin1: popl %ebx 54*d744a37aSDmitry Chagin addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 55*d744a37aSDmitry Chagin leal main@GOTOFF(%ebx),%eax 56*d744a37aSDmitry Chagin pushl %eax 57*d744a37aSDmitry Chagin#else 58*d744a37aSDmitry Chagin pushl $main 59*d744a37aSDmitry Chagin#endif /* PIC */ 60*d744a37aSDmitry Chagin 61302af795SEd Maste pushl %edx # rtld cleanup 62*d744a37aSDmitry Chagin /* env = argv + argc + 1 */ 63*d744a37aSDmitry Chagin movl %edi,%eax # env = argv 64*d744a37aSDmitry Chagin movl %esi,%ecx 65*d744a37aSDmitry Chagin shll $2,%ecx # argc * 4 66*d744a37aSDmitry Chagin addl %ecx,%eax # env += argc 67*d744a37aSDmitry Chagin addl $4,%eax # env += 1 68*d744a37aSDmitry Chagin pushl %eax # env 69*d744a37aSDmitry Chagin pushl %edi # argv 70*d744a37aSDmitry Chagin pushl %esi # argc 71*d744a37aSDmitry Chagin 72*d744a37aSDmitry Chagin#ifdef GCRT 73*d744a37aSDmitry Chagin /* 74*d744a37aSDmitry Chagin * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext); 75*d744a37aSDmitry Chagin */ 76*d744a37aSDmitry Chagin calll __libc_start1_gcrt 77*d744a37aSDmitry Chagin#else 78*d744a37aSDmitry Chagin /* 79*d744a37aSDmitry Chagin * __libc_start1(argc, argv, env, cleanup, main); 80*d744a37aSDmitry Chagin */ 81*d744a37aSDmitry Chagin#ifdef PIC 82*d744a37aSDmitry Chagin calll __libc_start1@PLT 83*d744a37aSDmitry Chagin#else 84*d744a37aSDmitry Chagin calll __libc_start1 85*d744a37aSDmitry Chagin#endif 86*d744a37aSDmitry Chagin#endif /* GCRT */ 87302af795SEd Maste int3 88302af795SEd Maste .cfi_endproc 89302af795SEd Maste .size _start, . - _start 90302af795SEd Maste 91302af795SEd Maste .section .note.GNU-stack,"",%progbits 92