1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * 27 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30#pragma ident "%Z%%M% %I% %E% SMI" 31 32/* 33 * Bootstrap routine for run-time linker. 34 * We get control from exec which has loaded our text and 35 * data into the process' address space and created the process 36 * stack. 37 * 38 * On entry, the process stack looks like this: 39 * 40 * # # <- %esp 41 * #_______________________# high addresses 42 * # strings # 43 * #_______________________# 44 * # 0 word # 45 * #_______________________# 46 * # Auxiliary # 47 * # entries # 48 * # ... # 49 * # (size varies) # 50 * #_______________________# 51 * # 0 word # 52 * #_______________________# 53 * # Environment # 54 * # pointers # 55 * # ... # 56 * # (one word each) # 57 * #_______________________# 58 * # 0 word # 59 * #_______________________# 60 * # Argument # low addresses 61 * # pointers # 62 * # Argc words # 63 * #_______________________# 64 * # argc # 65 * #_______________________# <- %ebp 66 * 67 * 68 * We must calculate the address at which ld.so was loaded, 69 * find the addr of the dynamic section of ld.so, of argv[0], and of 70 * the process' environment pointers - and pass the thing to _setup 71 * to handle. We then call _rtld - on return we jump to the entry 72 * point for the a.out. 73 */ 74 75#if defined(lint) 76 77extern unsigned long _setup(); 78extern void atexit_fini(); 79void 80main() 81{ 82 (void) _setup(); 83 atexit_fini(); 84} 85 86#else 87 88#include <link.h> 89 90 .file "boot.s" 91 .text 92 .globl _rt_boot 93 .globl _setup 94 .globl _GLOBAL_OFFSET_TABLE_ 95 .type _rt_boot,@function 96 .align 4 97 98_rt_alias: 99 jmp .get_ip / in case we were invoked from libc.so 100_rt_boot: 101 movl %esp,%ebp / save for referencing args 102 subl $EB_MAX_SIZE32,%esp / make room for a max sized boot vector 103 movl %esp,%esi / use esi as a pointer to &eb[0] 104 movl $EB_ARGV,0(%esi) / set up tag for argv 105 leal 4(%ebp),%eax / get address of argv 106 movl %eax,4(%esi) / put after tag 107 movl $EB_ENVP,8(%esi) / set up tag for envp 108 movl (%ebp),%eax / get # of args 109 addl $2,%eax / one for the zero & one for argc 110 leal (%ebp,%eax,4),%edi / now points past args & @ envp 111 movl %edi,12(%esi) / set envp 112.L0: addl $4,%edi / next 113 cmpl $0,-4(%edi) / search for 0 at end of env 114 jne .L0 115 movl $EB_AUXV,16(%esi) / set up tag for auxv 116 movl %edi,20(%esi) / point to auxv 117 movl $EB_NULL,24(%esi) / set up NULL tag 118.get_ip: 119 call .L1 / only way to get IP into a register 120.L1: 121 popl %ebx / pop the IP we just "pushed" 122 addl $_GLOBAL_OFFSET_TABLE_+[.-.L1],%ebx 123 pushl (%ebx) / address of dynamic structure 124 pushl %esi / push &eb[0] 125 126 call _setup@PLT / _setup(&eb[0], _DYNAMIC) 127 movl %ebp,%esp / release stack frame 128 129 movl atexit_fini@GOT(%ebx), %edx 130 jmp *%eax / transfer control to a.out 131 .size _rt_boot,.-_rt_boot 132 133#endif 134