rtld_start.S revision 1.7
1 /* $NetBSD: rtld_start.S,v 1.7 2002/09/11 21:14:08 mycroft Exp $ */ 2 3 /*- 4 * Copyright (C) 1998 Tsubai Masanari 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <machine/asm.h> 31 32 .globl _rtld_start 33 .globl _rtld 34 35 .text 36 37 _rtld_start: 38 stwu 1,-48(1) 39 stw 3,12(1) # argc 40 stw 4,16(1) # argv 41 stw 5,20(1) # envp 42 /* stw 6,24(1) # obj (always 0) */ 43 /* stw 7,28(1) # cleanup (always 0) */ 44 stw 8,32(1) # ps_strings 45 46 bl _GLOBAL_OFFSET_TABLE_@local-4 47 mflr 11 # r11 = (real) GOT 48 lwz 10,_GLOBAL_OFFSET_TABLE_@got(11) 49 # the linker thought GOT were ... 50 lwz 3,_DYNAMIC@got(11) 51 subf 4,10,11 # r4 = relocbase 52 add 3,3,4 # r3 = &_DYNAMIC 53 bl _rtld_relocate_nonplt_self@plt 54 55 lwz 4,16(1) 56 addi 3,4,-12 # sp = &argv[-3] /* XXX */ 57 58 bl _rtld@plt # _start = _rtld(sp) 59 mtlr 3 60 61 lwz 3,12(1) # argc 62 lwz 4,16(1) # argv 63 lwz 5,20(1) # envp 64 lwz 6,-8(4) # obj = sp[1] (== argv[-2]) 65 lwz 7,-12(4) # cleanup = sp[0] (== argv[-3]) 66 lwz 8,32(1) # ps_strings 67 68 addi 1,1,48 69 blrl # _start(argc, argv, envp, obj, cleanup, ps_strings) 70 71 li 0,1 # _exit() 72 sc 73 74 75 .globl _rtld_bind_start 76 .globl _rtld_bind_powerpc 77 78 _rtld_bind_start: 79 stwu 1,-160(1) 80 81 stw 0,20(1) 82 mflr 0 83 stw 0,16(1) # save lr 84 mfcr 0 85 stw 0,12(1) # save cr 86 stmw 3,24(1) # save r3-r31 87 88 mr 3,12 # obj 89 mr 4,11 # reloff 90 bl _rtld_bind_powerpc@plt # _rtld_bind(obj, reloff) 91 mtctr 3 92 93 lmw 3,24(1) # load r3-r31 94 lwz 0,12(1) # restore cr 95 mtcr 0 96 lwz 0,16(1) # restore lr 97 mtlr 0 98 lwz 0,20(1) 99 100 addi 1,1,160 101 bctr 102 103 .globl _rtld_powerpc_pltcall 104 .globl _rtld_powerpc_pltresolve 105 106 _rtld_powerpc_pltcall: 107 slwi 11,11,2 108 addis 11,11,0 # addis 11,11,jmptab@ha 109 lwz 11,0(11) # lwz 11,jmptab@l(11) 110 mtctr 11 111 bctr 112 113 _rtld_powerpc_pltresolve: 114 lis 12,0 # lis 12,_rtld_bind_start@ha 115 addi 12,12,0 # addi 12,12,_rtld_bind_start@l 116 mtctr 12 117 lis 12,0 # lis 12,obj@ha 118 addi 12,12,0 # addi 12,12,obj@l 119 bctr 120
Indexes created Tue Sep 30 11:09:46 GMT 2025