1/* $NetBSD: rtld_start.S,v 1.3 2001/12/14 21:33:59 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,%rdi # stack pointer arg to _rtld 47 pushq %rbx # save ps_strings 48 49 call _rtld@PLT # _rtld(sp) 50 51 popq %rbx # %rbx = ps_strings 52 popq %rdx # %rdx = cleanup 53 popq %rcx # %rcx = obj_main 54 jmp *%rax 55 56 .align 4 57 .globl _rtld_bind_start 58 .type _rtld_bind_start,@function 59_rtld_bind_start: # (obj, reloff) 60 pushfq # save caller-saved registers 61 pushq %rax 62 pushq %rcx 63 pushq %rdx 64 pushq %rsi 65 pushq %rdi 66 pushq %r8 67 pushq %r9 68 pushq %r10 69 pushq %r11 70 71 movq 80(%rsp),%rdi 72 movq 88(%rsp),%rsi 73 movq %rsi,%r11 # multiply by sizeof (Elf64_Rela) (24) 74 shlq $3,%r11 75 shlq $4,%rsi # 16 * index + 8 * index = 24 * index 76 addq %r11,%rsi 77 78 call _rtld_bind@PLT # call the binder 79 movq %rax,88(%rsp) # store function in obj 80 81 popq %r11 82 popq %r10 83 popq %r9 84 popq %r8 85 popq %rdi 86 popq %rsi 87 popq %rdx 88 popq %rcx 89 popq %rax 90 popfq 91 92 leaq 8(%rsp),%rsp 93 94 ret 95