1/* $NetBSD: rtld_start.S,v 1.3 2001/07/15 23:19:59 matt Exp $ */ 2 3/*- 4 * Copyright (c) 1998 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. 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 mov r0, sp /* arg#1 = sp */ 50 bl _rtld /* call the shared loader */ 51 mov r3, r0 /* save entry point */ 52 53 ldr r2, [sp, #0] /* r2 = cleanup */ 54 ldr r1, [sp, #4] /* r1 = obj_main */ 55 add sp, sp, #8 /* restore stack */ 56 mov r0, r4 /* restore ps_strings */ 57 mov pc, r3 /* jump to the entry point */ 58 59 .align 0 60 .globl _rtld_bind_start 61 .type _rtld_bind_start,%function 62/* 63 * stack[0] = RA 64 * ip = &GOT[n+3] 65 * lr = &GOT[2] 66 */ 67_rtld_bind_start: 68 stmdb sp!,{r0-r4,sl,fp} 69 70 sub r1, ip, lr /* r1 = 4 * (n + 1) */ 71 sub r1, r1, #4 /* r1 = 4 * n */ 72 add r1, r1, r1 /* r1 = 8 * n */ 73 74 ldr r0, [lr, #-4] /* get obj ptr from GOT[1] */ 75 mov r4, ip /* save GOT location */ 76 77 bl _rtld_bind /* Call the binder */ 78 79 str r0, [r4] /* save address in GOT */ 80 mov ip, r0 /* save new address */ 81 82 ldmia sp!,{r0-r4,sl,fp,lr} /* restore the stack */ 83 mov pc, ip /* jump to the new address */ 84 85