rtld_start.S revision 1.2
1 /* $NetBSD: rtld_start.S,v 1.2 2002/02/04 18:18:51 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Marcus Comstedt. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <machine/asm.h> 40 41 .text 42 .align 2 43 .globl .rtld_start 44 .type .rtld_start,@function 45 46 .rtld_start: 47 48 /* relocate GOT, so that we can use global function calls in rtld.c */ 49 50 mova 1f,r0 51 mov.l @r0,r1 52 add r1,r0 /* r0 = _GLOBAL_OFFSET_TABLE_ */ 53 54 mov.l 2f,r1 55 add r0,r1 /* r1 = GOT end */ 56 mov.l 3f,r2 57 mov.l @(r0,r2),r3 /* r3 = where the linker thinks GOT end is */ 58 mov r1,r2 59 sub r3,r2 /* r2 = displacement */ 60 4: 61 mov.l @r0+,r3 /* add displacement to all GOT entries */ 62 cmp/hs r1,r0 63 add #-4,r0 64 add r2,r3 65 mov.l r3,@r0 66 bf/s 4b 67 add #4,r0 68 69 bra 4f /* all done */ 70 nop 71 72 .align 2 73 1: .long _GLOBAL_OFFSET_TABLE_ 74 2: .long _DYNAMIC@GOTOFF 75 3: .long _DYNAMIC@GOT 76 77 78 4: 79 add #-8,r15 /* Make room for return args */ 80 mov r15,r4 81 mov.l 1f,r0 82 add #(1f-3f),r0 83 bsrf r0 /* _rtld(sp) */ 84 mov.l r9,@-r15 /* save ps_strings */ 85 3: 86 mov.l @r15+,r9 /* restore ps_strings */ 87 88 mov.l @r15+,r7 /* arg: cleanup */ 89 mov.l @r15+,r8 /* arg: obj */ 90 91 mov.l @r15,r4 /* restore argc */ 92 93 mov r15,r5 /* restore argv */ 94 add #4,r5 95 96 mov r4,r6 /* restore envp */ 97 shll2 r6 98 add r15,r6 99 jmp @r0 100 add #8,r6 101 .align 2 102 1: .long _rtld-. 103 .size .rtld_start,.-.rtld_start 104 105 .align 2 106 .globl _rtld_bind_start 107 .type _rtld_bind_start,@function 108 _rtld_bind_start: /* r0 = flag, r1 = reloff, r2 = obj */ 109 mov.l r3,@-r15 /* save registers */ 110 mov.l r4,@-r15 111 mov.l r5,@-r15 112 mov.l r6,@-r15 113 mov.l r7,@-r15 114 sts.l mach,@-r15 115 sts.l macl,@-r15 116 sts.l pr,@-r15 117 118 mov.l 2f,r0 119 add #(2f-4f),r0 120 mov r2,r4 /* copy of obj */ 121 bsrf r0 /* call the binder */ 122 mov r1,r5 /* copy of relobj */ 123 4: 124 lds.l @r15+,pr /* restore registers */ 125 lds.l @r15+,macl 126 lds.l @r15+,mach 127 mov.l @r15+,r7 128 mov.l @r15+,r6 129 mov.l @r15+,r5 130 mov.l @r15+,r4 131 jmp @r0 132 mov.l @r15+,r3 133 .align 2 134 2: .long _rtld_bind-. 135 .size _rtld_bind_start,.-_rtld_bind_start 136 137 .end 138
Indexes created Tue Sep 30 17:09:57 GMT 2025