1*ce099b40Smartin/* $NetBSD: rtld_start.S,v 1.16 2008/04/28 20:23:03 martin Exp $ */ 262926e7eSchristos 362926e7eSchristos/*- 433131cb2Smycroft * Copyright (c) 1999, 2002, 2003 The NetBSD Foundation, Inc. 562926e7eSchristos * All rights reserved. 662926e7eSchristos * 762926e7eSchristos * This code is derived from software contributed to The NetBSD Foundation 8ebf50cdfSmycroft * by Christos Zoulas, Paul Kranenburg, and by Charles M. Hannum. 962926e7eSchristos * 1062926e7eSchristos * Redistribution and use in source and binary forms, with or without 1162926e7eSchristos * modification, are permitted provided that the following conditions 1262926e7eSchristos * are met: 1362926e7eSchristos * 1. Redistributions of source code must retain the above copyright 1462926e7eSchristos * notice, this list of conditions and the following disclaimer. 1562926e7eSchristos * 2. Redistributions in binary form must reproduce the above copyright 1662926e7eSchristos * notice, this list of conditions and the following disclaimer in the 1762926e7eSchristos * documentation and/or other materials provided with the distribution. 1862926e7eSchristos * 1962926e7eSchristos * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 2062926e7eSchristos * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 2162926e7eSchristos * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 2262926e7eSchristos * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 2362926e7eSchristos * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 2462926e7eSchristos * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 2562926e7eSchristos * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 2662926e7eSchristos * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 2762926e7eSchristos * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 2862926e7eSchristos * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 2962926e7eSchristos * POSSIBILITY OF SUCH DAMAGE. 3062926e7eSchristos */ 3162926e7eSchristos 3262926e7eSchristos#include <machine/asm.h> 3362926e7eSchristos 34801d8e5bSpk .section ".text" 3577aa6b2aSchristos .align 4 36801d8e5bSpk .global _rtld_start 3762926e7eSchristos .type _rtld_start,@function 3862926e7eSchristos_rtld_start: 3977aa6b2aSchristos mov 0, %fp /* Erect a fence post for ourselves */ 4077aa6b2aSchristos mov %g1, %l1 /* save ps_strings */ 41f1c792d6Smycroft sub %sp, 32+8, %sp /* room for return args and save area */ 4262926e7eSchristos 43c127ff08Smycroft sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7 44eea1001aSmycroft call 0f 45c127ff08Smycroft add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7 46eea1001aSmycroft call _DYNAMIC+8 47eea1001aSmycroft0: add %l7, %o7, %l7 /* real &_GLOBAL_OFFSET_TABLE_ */ 48eea1001aSmycroft ld [%o7+8], %o0 /* load stub call instruction */ 49eea1001aSmycroft ld [%l7], %l0 /* base-relative &_DYNAMIC */ 50eea1001aSmycroft sll %o0, 2, %o0 /* extract PC offset */ 51c127ff08Smycroft 52eea1001aSmycroft add %o0, %o7, %o0 /* real &_DYNAMIC */ 53eea1001aSmycroft sub %o0, %l0, %l0 /* relocbase */ 545ee0e5e1Smycroft call _rtld_relocate_nonplt_self 55eea1001aSmycroft mov %l0, %o1 /* relocbase */ 565ee0e5e1Smycroft 57eea1001aSmycroft mov %l0, %o1 /* relocbase */ 58801d8e5bSpk call _rtld 59f1c792d6Smycroft add %sp, 96, %o0 /* &argc - 8 */ 6062926e7eSchristos 61f1c792d6Smycroft ld [%sp + 96], %g3 /* arg: cleanup */ 62f1c792d6Smycroft ld [%sp + 96 + 4], %g2 /* arg: obj */ 63f1c792d6Smycroft add %sp, 32+8, %sp /* restore stack pointer */ 6462926e7eSchristos 65801d8e5bSpk jmp %o0 6677aa6b2aSchristos mov %l1, %g1 /* restore ps_strings */ 67801d8e5bSpk 68801d8e5bSpk 69801d8e5bSpk .section ".text" 7062926e7eSchristos .align 4 71801d8e5bSpk .global _rtld_bind_start 7262926e7eSchristos .type _rtld_bind_start,@function 7362926e7eSchristos_rtld_bind_start: # (obj, reloff) 749e31b448Smycroft ld [%o7 + 8], %o0 /* obj id is in second PLT slot */ 7577aa6b2aSchristos srl %g1, 10, %o1 /* offset is in high 22 bits */ 7677aa6b2aSchristos call _rtld_bind /* Call _rtld_bind(obj, offset) */ 7777aa6b2aSchristos sub %o1, 12*4, %o1 /* first 4 `pltrel' entries missing! */ 78801d8e5bSpk 799e31b448Smycroft jmp %o0 /* return value == function address */ 8077aa6b2aSchristos restore 81801d8e5bSpk 82