rtld_start.S revision 1.14
1 /* $NetBSD: rtld_start.S,v 1.14 2003/02/27 05:39:42 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas, Paul Kranenburg, 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 .section ".text" 42 .align 4 43 .global _rtld_start 44 .type _rtld_start,@function 45 _rtld_start: 46 mov 0, %fp /* Erect a fence post for ourselves */ 47 mov %g1, %l1 /* save ps_strings */ 48 sub %sp, 32+8, %sp /* room for return args and save area */ 49 50 sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7 51 call 0f 52 add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7 53 call _DYNAMIC+8 54 0: add %l7, %o7, %l7 /* real &_GLOBAL_OFFSET_TABLE_ */ 55 ld [%o7+8], %o0 /* load stub call instruction */ 56 ld [%l7], %l0 /* base-relative &_DYNAMIC */ 57 sll %o0, 2, %o0 /* extract PC offset */ 58 59 add %o0, %o7, %o0 /* real &_DYNAMIC */ 60 sub %o0, %l0, %l0 /* relocbase */ 61 call _rtld_relocate_nonplt_self 62 mov %l0, %o1 /* relocbase */ 63 64 mov %l0, %o1 /* relocbase */ 65 call _rtld 66 add %sp, 96, %o0 /* &argc - 8 */ 67 68 ld [%sp + 96], %g3 /* arg: cleanup */ 69 ld [%sp + 96 + 4], %g2 /* arg: obj */ 70 add %sp, 32+8, %sp /* restore stack pointer */ 71 72 jmp %o0 73 mov %l1, %g1 /* restore ps_strings */ 74 75 76 .section ".text" 77 .align 4 78 .global _rtld_bind_start 79 .type _rtld_bind_start,@function 80 _rtld_bind_start: # (obj, reloff) 81 ld [%o7 + 8], %o0 /* obj id is in second PLT slot */ 82 srl %g1, 10, %o1 /* offset is in high 22 bits */ 83 call _rtld_bind /* Call _rtld_bind(obj, offset) */ 84 sub %o1, 12*4, %o1 /* first 4 `pltrel' entries missing! */ 85 86 jmp %o0 /* return value == function address */ 87 restore 88 89
Indexes created Mon Sep 29 21:09:56 GMT 2025