rtld_start.S revision 1.10
1 /* $NetBSD: rtld_start.S,v 1.10 2002/09/25 07:27:53 mycroft Exp $ */ 2 3 /*- 4 * Copyright (C) 1998 Tsubai Masanari 5 * Portions copyright 2002 Charles M. Hannum. 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 1,-48(1) 40 stw 3,12(1) # argc 41 stw 4,16(1) # argv 42 stw 5,20(1) # envp 43 /* stw 6,24(1) # obj (always 0) */ 44 /* stw 7,28(1) # cleanup (always 0) */ 45 stw 8,32(1) # ps_strings 46 47 bl _GLOBAL_OFFSET_TABLE_@local-4 48 mflr 31 # r31 = (real) GOT 49 lwz 30,_GLOBAL_OFFSET_TABLE_@got(31) 50 # the linker thought GOT were ... 51 lwz 3,_DYNAMIC@got(31) 52 53 subf 4,30,31 # r4 = relocbase 54 add 3,3,4 # r3 = &_DYNAMIC 55 bl _rtld_relocate_nonplt_self@plt 56 57 subf 4,30,31 # r4 = relocbase 58 lwz 3,16(1) 59 addi 3,3,-12 # sp = &argv[-3] /* XXX */ 60 bl _rtld@plt # _start = _rtld(sp, relocbase) 61 mtlr 3 62 63 lwz 3,12(1) # argc 64 lwz 4,16(1) # argv 65 lwz 5,20(1) # envp 66 lwz 6,-8(4) # obj = sp[1] (== argv[-2]) 67 lwz 7,-12(4) # cleanup = sp[0] (== argv[-3]) 68 lwz 8,32(1) # ps_strings 69 70 addi 1,1,48 71 blrl # _start(argc, argv, envp, obj, cleanup, ps_strings) 72 73 li 0,1 # _exit() 74 sc 75 76 77 .globl _rtld_bind_start 78 .globl _rtld_bind 79 80 _rtld_bind_start: 81 stwu 1,-160(1) 82 83 stw 0,20(1) 84 mflr 0 85 stw 0,16(1) # save lr 86 mfcr 0 87 stw 0,12(1) # save cr 88 stmw 3,24(1) # save r3-r31 89 90 mr 3,12 # obj 91 mr 4,11 # reloff 92 bl _rtld_bind@plt # _rtld_bind(obj, reloff) 93 mtctr 3 94 95 lmw 3,24(1) # load r3-r31 96 lwz 0,12(1) # restore cr 97 mtcr 0 98 lwz 0,16(1) # restore lr 99 mtlr 0 100 lwz 0,20(1) 101 102 addi 1,1,160 103 bctr 104 105 .globl _rtld_powerpc_pltcall 106 .globl _rtld_powerpc_pltresolve 107 108 _rtld_powerpc_pltcall: 109 slwi 11,11,2 110 addis 11,11,0 # addis 11,11,jmptab@ha 111 lwz 11,0(11) # lwz 11,jmptab@l(11) 112 mtctr 11 113 bctr 114 115 _rtld_powerpc_pltresolve: 116 lis 12,0 # lis 12,_rtld_bind_start@ha 117 addi 12,12,0 # addi 12,12,_rtld_bind_start@l 118 mtctr 12 119 lis 12,0 # lis 12,obj@ha 120 addi 12,12,0 # addi 12,12,obj@l 121 bctr 122
Indexes created Tue Sep 30 11:09:46 GMT 2025