/* $NetBSD: rtld_start64.S,v 1.2 2014/03/06 19:19:40 matt Exp $ */ /*- * Copyright (C) 1998 Tsubai Masanari * Portions copyright 2002 Charles M. Hannum <root@ihack.net> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <machine/asm.h> .globl _rtld_relocate_nonplt_self .globl _rtld .text ENTRY_NOPROFILE(_rtld_start) mr %r23,%r3 // argc mr %r24,%r4 // argv mr %r25,%r5 // envp /* mr %r26,%r6 // obj (always 0) */ /* mr %r27,%r7 // cleanup (always 0) */ mr %r28,%r8 // ps_strings li %r0,0 stdu %r0,-64(%r1) // terminate stack chain std %r2,40(%r1) // save TOC std %r0,16(%r1) // ditto bcl 20,31,1f 1: mflr %r30 ld %r3,0(%r2) // TOC[0] = &TOC sub %r29,%r2,%r3 // compute relocbase addis %r3,%r3,_DYNAMIC-1b@ha // get _DYNAMIC actual address addi %r3,%r3,_DYNAMIC-1b@l mr %r4,%r29 // r4 = relocbase CALL(_rtld_relocate_nonplt_self) addi %r3,%r1,48 // sp = <local variable space> mr %r4,%r29 // r4 = relocbase CALL(_rtld) // _start = _rtld(sp, relocbase) ld %r0,0(%r3) // func address ld %r2,8(%r3) // TOC address ld %r11,16(%r3) // environment pointer mtctr %r0 // so we can call it. mr %r3,%r23 // argc mr %r4,%r24 // argv mr %r5,%r25 // envp ld %r6,56(%r1) // obj = <localvar>[1] ld %r7,48(%r1) // cleanup = <localvar>[0] mr %r8,%r28 // ps_strings bctrl // _start(argc, argv, envp, obj, cleanup, ps_strings) nop li %r0,1 // _exit() sc END(_rtld_start) .globl _rtld_bind /* * %r0 has the index of the rela, %r12 has a pointer to the plt entry. */ ENTRY_NOPROFILE(_rtld_bind_start) std %r3,-72(%r1) // save argument register std %r4,-64(%r1) // save argument register std %r5,-56(%r1) // save argument register std %r6,-48(%r1) // save argument register std %r7,-40(%r1) // save argument register std %r8,-32(%r1) // save argument register std %r9,-24(%r1) // save argument register std %r10,-16(%r1) // save argument register std %r31,-8(%r1) // save register stdu %r1,-(48+80)(%r1) // create back chain mflr %r10 std %r10,16(%r1) // save LR mfcr %r9 std %r9,8(%r1) // save CR to be safe mr %r31, %r12 // save this across bind call mr %r3, %r11 // obj mr %r4, %r0 // reloff CALL(_rtld_bind) // _rtld_bind(obj, reloff) mtctr %r3 mr %r12,%r31 // restore r12 ld %r0,8(%r1) // get saved CR mtcr %r0 // restore it ld %r0,16(%r1) // get saved LR mtlr %r0 // restore it addi %r1,%r1,(48+80) // adjust stack ld %r3,-72(%r1) // restore argument register ld %r4,-64(%r1) // restore argument register ld %r5,-56(%r1) // restore argument register ld %r6,-48(%r1) // restore argument register ld %r7,-40(%r1) // restore argument register ld %r8,-32(%r1) // restore argument register ld %r9,-24(%r1) // restore argument register ld %r10,-16(%r1) // restore argument register ld %r31,-8(%r1) // restore register bctr END(_rtld_bind_start)
