rtld_start.S revision 1.5
1 /* $NetBSD: rtld_start.S,v 1.5 2002/09/10 02:24:51 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 subi 3,11,4 # r3 = _GLOBAL_OFFSET_TABLE_-4 49 50 dcbst 0,3 # sync i-cache with d-cache 51 sync 52 icbi 0,3 53 isync 54 55 lwz 10,_GLOBAL_OFFSET_TABLE_@got(11) 56 # the linker thought GOT were ... 57 subf 9,10,11 # r9 = displacement 58 59 lwz 8,_GOT_END_@got(11) 60 add 8,8,9 # add the displacement 61 62 1: lwz 3,0(11) 63 add 3,3,9 # add the displacement 64 stw 3,0(11) 65 addi 11,11,4 # r11++ 66 cmpl 0,11,8 # done? 67 blt 1b 68 69 lwz 4,16(1) 70 addi 3,4,-12 # sp = &argv[-3] /* XXX */ 71 72 bl _rtld@plt # _start = _rtld(sp) 73 mtlr 3 74 75 lwz 3,12(1) # argc 76 lwz 4,16(1) # argv 77 lwz 5,20(1) # envp 78 lwz 6,-8(4) # obj = sp[1] (== argv[-2]) 79 lwz 7,-12(4) # cleanup = sp[0] (== argv[-3]) 80 lwz 8,32(1) # ps_strings 81 82 addi 1,1,48 83 blrl # _start(argc, argv, envp, obj, cleanup, ps_strings) 84 85 li 0,1 # _exit() 86 sc 87 88 89 .globl _rtld_bind_start 90 .globl _rtld_bind_powerpc 91 92 _rtld_bind_start: 93 stwu 1,-160(1) 94 95 stw 0,20(1) 96 mflr 0 97 stw 0,16(1) # save lr 98 mfcr 0 99 stw 0,12(1) # save cr 100 stmw 3,24(1) # save r3-r31 101 102 mr 3,12 # obj 103 mr 4,11 # reloff 104 bl _rtld_bind_powerpc@plt # _rtld_bind(obj, reloff) 105 mtctr 3 106 107 lmw 3,24(1) # load r3-r31 108 lwz 0,12(1) # restore cr 109 mtcr 0 110 lwz 0,16(1) # restore lr 111 mtlr 0 112 lwz 0,20(1) 113 114 addi 1,1,160 115 bctr 116 117 .globl _rtld_powerpc_pltcall 118 .globl _rtld_powerpc_pltresolve 119 120 _rtld_powerpc_pltcall: 121 slwi 11,11,2 122 addis 11,11,0 # addis 11,11,jmptab@ha 123 lwz 11,0(11) # lwz 11,jmptab@l(11) 124 mtctr 11 125 bctr 126 127 _rtld_powerpc_pltresolve: 128 lis 12,0 # lis 12,_rtld_bind_start@ha 129 addi 12,12,0 # addi 12,12,_rtld_bind_start@l 130 mtctr 12 131 lis 12,0 # lis 12,obj@ha 132 addi 12,12,0 # addi 12,12,obj@l 133 bctr 134
Indexes created Tue Sep 30 07:10:03 GMT 2025