rtld_start.S revision 1.8
1 /* $NetBSD: rtld_start.S,v 1.8 2002/09/12 17:07:26 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 31 # r31 = (real) GOT 48 lwz 30,_GLOBAL_OFFSET_TABLE_@got(31) 49 # the linker thought GOT were ... 50 lwz 3,_DYNAMIC@got(31) 51 52 subf 4,30,31 # r4 = relocbase 53 add 3,3,4 # r3 = &_DYNAMIC 54 bl _rtld_relocate_nonplt_self@plt 55 56 subf 4,30,31 # r4 = relocbase 57 lwz 3,16(1) 58 addi 3,3,-12 # sp = &argv[-3] /* XXX */ 59 bl _rtld@plt # _start = _rtld(sp, relocbase) 60 mtlr 3 61 62 lwz 3,12(1) # argc 63 lwz 4,16(1) # argv 64 lwz 5,20(1) # envp 65 lwz 6,-8(4) # obj = sp[1] (== argv[-2]) 66 lwz 7,-12(4) # cleanup = sp[0] (== argv[-3]) 67 lwz 8,32(1) # ps_strings 68 69 addi 1,1,48 70 blrl # _start(argc, argv, envp, obj, cleanup, ps_strings) 71 72 li 0,1 # _exit() 73 sc 74 75 76 .globl _rtld_bind_start 77 .globl _rtld_bind_powerpc 78 79 _rtld_bind_start: 80 stwu 1,-160(1) 81 82 stw 0,20(1) 83 mflr 0 84 stw 0,16(1) # save lr 85 mfcr 0 86 stw 0,12(1) # save cr 87 stmw 3,24(1) # save r3-r31 88 89 mr 3,12 # obj 90 mr 4,11 # reloff 91 bl _rtld_bind_powerpc@plt # _rtld_bind(obj, reloff) 92 mtctr 3 93 94 lmw 3,24(1) # load r3-r31 95 lwz 0,12(1) # restore cr 96 mtcr 0 97 lwz 0,16(1) # restore lr 98 mtlr 0 99 lwz 0,20(1) 100 101 addi 1,1,160 102 bctr 103 104 .globl _rtld_powerpc_pltcall 105 .globl _rtld_powerpc_pltresolve 106 107 _rtld_powerpc_pltcall: 108 slwi 11,11,2 109 addis 11,11,0 # addis 11,11,jmptab@ha 110 lwz 11,0(11) # lwz 11,jmptab@l(11) 111 mtctr 11 112 bctr 113 114 _rtld_powerpc_pltresolve: 115 lis 12,0 # lis 12,_rtld_bind_start@ha 116 addi 12,12,0 # addi 12,12,_rtld_bind_start@l 117 mtctr 12 118 lis 12,0 # lis 12,obj@ha 119 addi 12,12,0 # addi 12,12,obj@l 120 bctr 121
Indexes created Tue Sep 30 07:10:03 GMT 2025