rtld_start.S revision 1.13
1 /* $NetBSD: rtld_start.S,v 1.13 2002/12/04 01:19:37 thorpej Exp $ */ 2 3 /*- 4 * Copyright (C) 1998 Tsubai Masanari 5 * Portions copyright 2002 Charles M. Hannum <root (at) ihack.net> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <machine/asm.h> 32 33 .globl _rtld_start 34 .globl _rtld 35 36 .text 37 38 _rtld_start: 39 stwu %r1,-48(%r1) 40 stw %r3,12(%r1) # argc 41 stw %r4,16(%r1) # argv 42 stw %r5,20(%r1) # envp 43 /* stw %r6,24(%r1) # obj (always 0) */ 44 /* stw %r7,28(%r1) # cleanup (always 0) */ 45 stw %r8,32(%r1) # ps_strings 46 47 bl _GLOBAL_OFFSET_TABLE_-4@local 48 mflr %r31 # r31 = (real) GOT 49 lwz %r28,0(%r31) # base-relative &_DYNAMIC 50 51 bl 0f # lr = next instruction 52 b _DYNAMIC@local 53 0: mflr %r30 54 lwz %r29,0(%r30) # load instruction contents 55 rlwinm %r29,%r29,0,6,29 # extract PC offset 56 add %r3,%r29,%r30 # r3 = &_DYNAMIC 57 sub %r28,%r3,%r28 58 mr %r4,%r28 # r4 = relocbase 59 bl _rtld_relocate_nonplt_self@plt 60 61 lwz %r3,16(%r1) 62 addi %r3,%r3,-12 # sp = &argv[-3] /* XXX */ 63 mr %r4,%r28 # r4 = relocbase 64 bl _rtld@plt # _start = _rtld(sp, relocbase) 65 mtlr %r3 66 67 lwz %r3,12(%r1) # argc 68 lwz %r4,16(%r1) # argv 69 lwz %r5,20(%r1) # envp 70 lwz %r6,-8(%r4) # obj = sp[1] (== argv[-2]) 71 lwz %r7,-12(%r4) # cleanup = sp[0] (== argv[-3]) 72 lwz %r8,32(%r1) # ps_strings 73 74 addi %r1,%r1,48 75 blrl # _start(argc, argv, envp, obj, cleanup, ps_strings) 76 77 li %r0,1 # _exit() 78 sc 79 80 81 .globl _rtld_bind_start 82 .globl _rtld_bind 83 84 _rtld_bind_start: 85 stwu %r1,-160(%r1) 86 87 stw %r0,20(%r1) 88 mflr %r0 89 stw %r0,16(%r1) # save lr 90 mfcr %r0 91 stw %r0,12(%r1) # save cr 92 stmw %r3,24(%r1) # save r3-r31 93 94 mr %r3,%r12 # obj 95 mr %r4,%r11 # reloff 96 bl _rtld_bind@plt # _rtld_bind(obj, reloff) 97 mtctr %r3 98 99 lmw %r3,24(%r1) # load r3-r31 100 lwz %r0,12(%r1) # restore cr 101 mtcr %r0 102 lwz %r0,16(%r1) # restore lr 103 mtlr %r0 104 lwz %r0,20(%r1) 105 106 addi %r1,%r1,160 107 bctr 108 109 .globl _rtld_powerpc_pltcall 110 .globl _rtld_powerpc_pltresolve 111 112 _rtld_powerpc_pltcall: 113 slwi %r11,%r11,2 114 addis %r11,%r11,0 # addis 11,11,jmptab@ha 115 lwz %r11,0(%r11) # lwz 11,jmptab@l(11) 116 mtctr %r11 117 bctr 118 119 _rtld_powerpc_pltresolve: 120 lis %r12,0 # lis 12,_rtld_bind_start@ha 121 addi %r12,%r12,0 # addi 12,12,_rtld_bind_start@l 122 mtctr %r12 123 lis %r12,0 # lis 12,obj@ha 124 addi %r12,%r12,0 # addi 12,12,obj@l 125 bctr 126
Indexes created Mon Sep 29 21:09:56 GMT 2025