rtld_start.S revision 1.3
1 1.3 kim /* $NetBSD: rtld_start.S,v 1.3 1999/03/01 03:39:39 kim Exp $ */ 2 1.1 christos 3 1.1 christos /*- 4 1.2 pk * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 1.1 christos * All rights reserved. 6 1.1 christos * 7 1.1 christos * This code is derived from software contributed to The NetBSD Foundation 8 1.2 pk * by Christos Zoulas & Paul Kranenburg. 9 1.1 christos * 10 1.1 christos * Redistribution and use in source and binary forms, with or without 11 1.1 christos * modification, are permitted provided that the following conditions 12 1.1 christos * are met: 13 1.1 christos * 1. Redistributions of source code must retain the above copyright 14 1.1 christos * notice, this list of conditions and the following disclaimer. 15 1.1 christos * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 christos * notice, this list of conditions and the following disclaimer in the 17 1.1 christos * documentation and/or other materials provided with the distribution. 18 1.1 christos * 3. All advertising materials mentioning features or use of this software 19 1.1 christos * must display the following acknowledgement: 20 1.1 christos * This product includes software developed by the NetBSD 21 1.1 christos * Foundation, Inc. and its contributors. 22 1.1 christos * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1 christos * contributors may be used to endorse or promote products derived 24 1.1 christos * from this software without specific prior written permission. 25 1.1 christos * 26 1.1 christos * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1 christos * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1 christos * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1 christos * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1 christos * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1 christos * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1 christos * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1 christos * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1 christos * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1 christos * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1 christos * POSSIBILITY OF SUCH DAMAGE. 37 1.1 christos */ 38 1.1 christos 39 1.1 christos #include <machine/asm.h> 40 1.1 christos 41 1.2 pk .section ".text" 42 1.1 christos .align 8 43 1.2 pk .global _rtld_start 44 1.1 christos .type _rtld_start,@function 45 1.1 christos _rtld_start: 46 1.2 pk mov 0, %fp ! Erect a fence post for ourselves 47 1.2 pk mov %g1, %l1 ! save ps_strings 48 1.2 pk sub %sp, 8, %sp ! Make room for return args 49 1.1 christos 50 1.2 pk call _rtld 51 1.2 pk add %sp, 64, %o0 ! &argc - 8 52 1.2 pk 53 1.2 pk ld [%sp + 64], %g3 ! arg: cleanup 54 1.2 pk ld [%sp + 64 + 4], %g2 ! arg: obj 55 1.2 pk add %sp, 8, %sp ! restore stack pointer 56 1.2 pk 57 1.2 pk jmp %o0 58 1.2 pk mov %l1, %g1 ! restore ps_strings 59 1.2 pk 60 1.2 pk 61 1.2 pk .section ".text" 62 1.1 christos .align 4 63 1.2 pk .global _rtld_bind_start 64 1.1 christos .type _rtld_bind_start,@function 65 1.1 christos _rtld_bind_start: # (obj, reloff) 66 1.2 pk save %sp, -96, %sp ! setup standard stack frame 67 1.2 pk ld [%i7 + 8], %o0 ! obj id is in second PLT slot 68 1.2 pk srl %g1, 10, %o1 ! offset is in high 22 bits 69 1.2 pk call _rtld_bind ! Call _rtld_bind(obj, offset) 70 1.3 kim sub %o1, 12*4, %o1 ! first 4 'pltrel' entries are missing! 71 1.2 pk 72 1.2 pk mov %o0, %g1 ! return value == function address 73 1.2 pk restore ! get rid of our context 74 1.2 pk jmp %g1 ! and the jmpslot context, then go. 75 1.2 pk restore ! 76 1.2 pk 77
Indexes created Thu Oct 02 14:10:14 GMT 2025