1/* $NetBSD: rtld_start.S,v 1.15 2003/03/01 15:14:59 mycroft Exp $ */ 2 3/*- 4 * Copyright (c) 1999, 2002, 2003 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <machine/asm.h> 33 34 .section ".text" 35 .align 4 36 .global _rtld_start 37 .type _rtld_start,@function 38_rtld_start: 39 mov 0, %fp /* Erect a fence post for ourselves */ 40 mov %g1, %l1 /* save ps_strings */ 41 sub %sp, 32+8, %sp /* room for return args and save area */ 42 43 sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7 44 call 0f 45 add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7 46 call _DYNAMIC+8 470: add %l7, %o7, %l7 /* real &_GLOBAL_OFFSET_TABLE_ */ 48 ld [%o7+8], %o0 /* load stub call instruction */ 49 ld [%l7], %l0 /* base-relative &_DYNAMIC */ 50 sll %o0, 2, %o0 /* extract PC offset */ 51 52 add %o0, %o7, %o0 /* real &_DYNAMIC */ 53 sub %o0, %l0, %l0 /* relocbase */ 54 call _rtld_relocate_nonplt_self 55 mov %l0, %o1 /* relocbase */ 56 57 mov %l0, %o1 /* relocbase */ 58 call _rtld 59 add %sp, 96, %o0 /* &argc - 8 */ 60 61 ld [%sp + 96], %g3 /* arg: cleanup */ 62 ld [%sp + 96 + 4], %g2 /* arg: obj */ 63 add %sp, 32+8, %sp /* restore stack pointer */ 64 65 jmp %o0 66 mov %l1, %g1 /* restore ps_strings */ 67 68 69 .section ".text" 70 .align 4 71 .global _rtld_bind_start 72 .type _rtld_bind_start,@function 73_rtld_bind_start: # (obj, reloff) 74 ld [%o7 + 8], %o0 /* obj id is in second PLT slot */ 75 srl %g1, 10, %o1 /* offset is in high 22 bits */ 76 call _rtld_bind /* Call _rtld_bind(obj, offset) */ 77 sub %o1, 12*4, %o1 /* first 4 `pltrel' entries missing! */ 78 79 jmp %o0 /* return value == function address */ 80 restore 81 82