1/* $NetBSD: rtld_start.S,v 1.7 2002/09/12 17:18:38 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 Matt Thomas 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 0 43 .globl _rtld_start 44 .type _rtld_start,%function 45_rtld_start: 46 sub sp, sp, #8 /* make room for obj_main & exit proc */ 47 mov r4, r0 /* save ps_strings */ 48 49 ldr sl, .L2 50 ldr r5, .L2+4 51 ldr r0, .L2+8 52.L1: 53 add sl, pc, sl 54 ldr r5, [sl, r5] 55 ldr r0, [sl, r0] 56 57 sub r1, sl, r5 /* relocbase */ 58 add r0, r1, r0 /* &_DYNAMIC */ 59 bl _rtld_relocate_nonplt_self 60 61 sub r1, sl, r5 /* relocbase */ 62 mov r0, sp /* sp */ 63 bl _rtld /* call the shared loader */ 64 mov r3, r0 /* save entry point */ 65 66 ldr r2, [sp, #0] /* r2 = cleanup */ 67 ldr r1, [sp, #4] /* r1 = obj_main */ 68 add sp, sp, #8 /* restore stack */ 69 mov r0, r4 /* restore ps_strings */ 70 mov pc, r3 /* jump to the entry point */ 71.L2: 72 .word _GLOBAL_OFFSET_TABLE_ - (.L1+8) 73 .word _GLOBAL_OFFSET_TABLE_(GOT) 74 .word _DYNAMIC(GOT) 75 76 .align 0 77 .globl _rtld_bind_start 78 .type _rtld_bind_start,%function 79/* 80 * stack[0] = RA 81 * ip = &GOT[n+3] 82 * lr = &GOT[2] 83 */ 84_rtld_bind_start: 85 stmdb sp!,{r0-r4,sl,fp} 86 87 sub r1, ip, lr /* r1 = 4 * (n + 1) */ 88 sub r1, r1, #4 /* r1 = 4 * n */ 89 add r1, r1, r1 /* r1 = 8 * n */ 90 91 ldr r0, [lr, #-4] /* get obj ptr from GOT[1] */ 92 mov r4, ip /* save GOT location */ 93 94 bl _rtld_bind /* Call the binder */ 95 96 str r0, [r4] /* save address in GOT */ 97 mov ip, r0 /* save new address */ 98 99 ldmia sp!,{r0-r4,sl,fp,lr} /* restore the stack */ 100 mov pc, ip /* jump to the new address */ 101 102