1/* $NetBSD: rtld_start.S,v 1.5 2002/11/24 18:16:45 fvdl Exp $ */ 2 3/* 4 * Copyright (c) 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Frank van der Linden for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include <machine/asm.h> 39 40 .text 41 .align 16 42 .globl .rtld_start 43 .type .rtld_start,@function 44.rtld_start: 45 subq $16,%rsp # make room of obj_main and exit proc 46 movq %rsp,%r12 # stack pointer arg to _rtld 47 pushq %rbx # save ps_strings 48 49 leaq _GLOBAL_OFFSET_TABLE_(%rip),%rbx 50 movq _GLOBAL_OFFSET_TABLE_@GOTPCREL(%rip),%rdx 51 subq %rdx,%rbx # %rbx = relocbase 52 53 movq _DYNAMIC@GOTPCREL(%rip),%rdi 54 addq %rbx,%rdi 55 movq %rbx,%rsi 56 call _rtld_relocate_nonplt_self@PLT 57 58 movq %r12,%rdi 59 movq %rbx,%rsi 60 61 call _rtld@PLT # _rtld(sp, relocbase) 62 63 popq %rbx # %rbx = ps_strings 64 popq %rdx # %rdx = cleanup 65 popq %rcx # %rcx = obj_main 66 jmp *%rax 67 68 .align 4 69 .globl _rtld_bind_start 70 .type _rtld_bind_start,@function 71_rtld_bind_start: # (obj, reloff) 72 pushfq # save caller-saved registers 73 pushq %rax 74 pushq %rcx 75 pushq %rdx 76 pushq %rsi 77 pushq %rdi 78 pushq %r8 79 pushq %r9 80 pushq %r10 81 pushq %r11 82 83 movq 80(%rsp),%rdi 84 movq 88(%rsp),%rsi 85 86 call _rtld_bind@PLT # call the binder 87 movq %rax,88(%rsp) # store function in obj 88 89 popq %r11 90 popq %r10 91 popq %r9 92 popq %r8 93 popq %rdi 94 popq %rsi 95 popq %rdx 96 popq %rcx 97 popq %rax 98 popfq 99 100 leaq 8(%rsp),%rsp 101 102 ret 103