1*e83f7ba2SBen Gras/* $NetBSD: rtld_start.S,v 1.16 2008/04/28 20:23:03 martin Exp $ */ 2*e83f7ba2SBen Gras 3*e83f7ba2SBen Gras/*- 4*e83f7ba2SBen Gras * Copyright (c) 1999, 2002, 2003 The NetBSD Foundation, Inc. 5*e83f7ba2SBen Gras * All rights reserved. 6*e83f7ba2SBen Gras * 7*e83f7ba2SBen Gras * This code is derived from software contributed to The NetBSD Foundation 8*e83f7ba2SBen Gras * by Christos Zoulas, Paul Kranenburg, and by Charles M. Hannum. 9*e83f7ba2SBen Gras * 10*e83f7ba2SBen Gras * Redistribution and use in source and binary forms, with or without 11*e83f7ba2SBen Gras * modification, are permitted provided that the following conditions 12*e83f7ba2SBen Gras * are met: 13*e83f7ba2SBen Gras * 1. Redistributions of source code must retain the above copyright 14*e83f7ba2SBen Gras * notice, this list of conditions and the following disclaimer. 15*e83f7ba2SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 16*e83f7ba2SBen Gras * notice, this list of conditions and the following disclaimer in the 17*e83f7ba2SBen Gras * documentation and/or other materials provided with the distribution. 18*e83f7ba2SBen Gras * 19*e83f7ba2SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20*e83f7ba2SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21*e83f7ba2SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22*e83f7ba2SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23*e83f7ba2SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24*e83f7ba2SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25*e83f7ba2SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26*e83f7ba2SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27*e83f7ba2SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28*e83f7ba2SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29*e83f7ba2SBen Gras * POSSIBILITY OF SUCH DAMAGE. 30*e83f7ba2SBen Gras */ 31*e83f7ba2SBen Gras 32*e83f7ba2SBen Gras#include <machine/asm.h> 33*e83f7ba2SBen Gras 34*e83f7ba2SBen Gras .section ".text" 35*e83f7ba2SBen Gras .align 4 36*e83f7ba2SBen Gras .global _rtld_start 37*e83f7ba2SBen Gras .type _rtld_start,@function 38*e83f7ba2SBen Gras_rtld_start: 39*e83f7ba2SBen Gras mov 0, %fp /* Erect a fence post for ourselves */ 40*e83f7ba2SBen Gras mov %g1, %l1 /* save ps_strings */ 41*e83f7ba2SBen Gras sub %sp, 32+8, %sp /* room for return args and save area */ 42*e83f7ba2SBen Gras 43*e83f7ba2SBen Gras sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7 44*e83f7ba2SBen Gras call 0f 45*e83f7ba2SBen Gras add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7 46*e83f7ba2SBen Gras call _DYNAMIC+8 47*e83f7ba2SBen Gras0: add %l7, %o7, %l7 /* real &_GLOBAL_OFFSET_TABLE_ */ 48*e83f7ba2SBen Gras ld [%o7+8], %o0 /* load stub call instruction */ 49*e83f7ba2SBen Gras ld [%l7], %l0 /* base-relative &_DYNAMIC */ 50*e83f7ba2SBen Gras sll %o0, 2, %o0 /* extract PC offset */ 51*e83f7ba2SBen Gras 52*e83f7ba2SBen Gras add %o0, %o7, %o0 /* real &_DYNAMIC */ 53*e83f7ba2SBen Gras sub %o0, %l0, %l0 /* relocbase */ 54*e83f7ba2SBen Gras call _rtld_relocate_nonplt_self 55*e83f7ba2SBen Gras mov %l0, %o1 /* relocbase */ 56*e83f7ba2SBen Gras 57*e83f7ba2SBen Gras mov %l0, %o1 /* relocbase */ 58*e83f7ba2SBen Gras call _rtld 59*e83f7ba2SBen Gras add %sp, 96, %o0 /* &argc - 8 */ 60*e83f7ba2SBen Gras 61*e83f7ba2SBen Gras ld [%sp + 96], %g3 /* arg: cleanup */ 62*e83f7ba2SBen Gras ld [%sp + 96 + 4], %g2 /* arg: obj */ 63*e83f7ba2SBen Gras add %sp, 32+8, %sp /* restore stack pointer */ 64*e83f7ba2SBen Gras 65*e83f7ba2SBen Gras jmp %o0 66*e83f7ba2SBen Gras mov %l1, %g1 /* restore ps_strings */ 67*e83f7ba2SBen Gras 68*e83f7ba2SBen Gras 69*e83f7ba2SBen Gras .section ".text" 70*e83f7ba2SBen Gras .align 4 71*e83f7ba2SBen Gras .global _rtld_bind_start 72*e83f7ba2SBen Gras .type _rtld_bind_start,@function 73*e83f7ba2SBen Gras_rtld_bind_start: # (obj, reloff) 74*e83f7ba2SBen Gras ld [%o7 + 8], %o0 /* obj id is in second PLT slot */ 75*e83f7ba2SBen Gras srl %g1, 10, %o1 /* offset is in high 22 bits */ 76*e83f7ba2SBen Gras call _rtld_bind /* Call _rtld_bind(obj, offset) */ 77*e83f7ba2SBen Gras sub %o1, 12*4, %o1 /* first 4 `pltrel' entries missing! */ 78*e83f7ba2SBen Gras 79*e83f7ba2SBen Gras jmp %o0 /* return value == function address */ 80*e83f7ba2SBen Gras restore 81*e83f7ba2SBen Gras 82