1/* $NetBSD: rtld_start.S,v 1.11 2010/12/05 00:56:07 joerg Exp $ */ 2 3/*- 4 * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas and by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <machine/asm.h> 33 34 .text 35 .align 4 36 .globl .rtld_start 37 .hidden .rtld_start 38 .type .rtld_start,@function 39.rtld_start: 40 subl $8,%esp # make room of obj_main and exit proc 41 pushl %ebx # save ps_strings 42 43 call 1f 441: 45 popl %edx 46 leal _DYNAMIC-1b(%edx),%ecx # &_DYNAMIC 47 movl %ecx,%ebx 48 subl _GLOBAL_OFFSET_TABLE_-1b(%edx),%ebx 49 50 pushl %ebx # relocbase 51 pushl %ecx # &_DYNAMIC 52 call _rtld_relocate_nonplt_self 53 54 leal 12(%esp),%eax # &cleanup 55 pushl %ebx # relocbase 56 pushl %eax # sp 57 call _rtld # _rtld(sp, relocbase) 58 59 addl $16,%esp # pop args 60 61 popl %ebx # %ebx = ps_strings 62 popl %edx # %edx = cleanup 63 popl %ecx # %ecx = obj_main 64 jmp *%eax 65 66 .align 4 67 .globl _rtld_bind_start 68 .hidden _rtld_bind_start 69 .type _rtld_bind_start,@function 70_rtld_bind_start: # (obj, reloff) 71 pushf # save registers 72 pushl %eax 73 pushl %ecx 74 pushl %edx 75 76 pushl 20(%esp) # Copy of reloff 77 pushl 20(%esp) # Copy of obj 78 call _rtld_bind # Call the binder 79 addl $8,%esp # pop binder args 80 movl %eax,20(%esp) # Store function to be called in obj 81 82 popl %edx 83 popl %ecx 84 popl %eax 85 popf 86 87 leal 4(%esp),%esp # Discard reloff, do not change eflags 88 ret 89