1/* $NetBSD: rtld_start.S,v 1.8 2002/09/25 08:00:26 mycroft 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <machine/asm.h> 40 41 .text 42 .align 4 43 .globl .rtld_start 44 .type .rtld_start,@function 45.rtld_start: 46 subl $8,%esp # make room of obj_main and exit proc 47 pushl %ebx # save ps_strings 48 49 call 1f 501: 51 popl %ebx 52 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 53 54 movl _GLOBAL_OFFSET_TABLE_@GOT(%ebx),%edx 55 movl _DYNAMIC@GOT(%ebx),%ecx 56 subl %edx,%ebx 57 pushl %ebx # relocbase 58 addl %ebx,%ecx 59 pushl %ecx # &_DYNAMIC 60 call _rtld_relocate_nonplt_self@PLT 61 62 leal 12(%esp),%eax # &cleanup 63 pushl %ebx # relocbase 64 pushl %eax # sp 65 call _rtld@PLT # _rtld(sp, relocbase) 66 67 addl $16,%esp # pop args 68 69 popl %ebx # %ebx = ps_strings 70 popl %edx # %edx = cleanup 71 popl %ecx # %ecx = obj_main 72 jmp *%eax 73 74 .align 4 75 .globl _rtld_bind_start 76 .type _rtld_bind_start,@function 77_rtld_bind_start: # (obj, reloff) 78 pushf # save registers 79 pushl %eax 80 pushl %ecx 81 pushl %edx 82 83 pushl 20(%esp) # Copy of reloff 84 pushl 20(%esp) # Copy of obj 85 call _rtld_bind@PLT # Call the binder 86 addl $8,%esp # pop binder args 87 movl %eax,20(%esp) # Store function to be called in obj 88 89 popl %edx 90 popl %ecx 91 popl %eax 92 popf 93 94 leal 4(%esp),%esp # Discard reloff, do not change eflags 95 ret 96