Root/
| Source at commit 1146 created 12 years 11 months ago. By azimutz, Sync with trunk (r1145). Add nVidia dev id's, 0DF4 for "GeForce GT 450M" (issue 99) and 1251 for "GeForce GTX 560M" (thanks to oSxFr33k for testing). | |
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| 1 | /*␊ |
| 2 | * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * This file contains Original Code and/or Modifications of Original Code␊ |
| 7 | * as defined in and that are subject to the Apple Public Source License␊ |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
| 9 | * compliance with the License. Please obtain a copy of the License at␊ |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
| 11 | * file.␊ |
| 12 | * ␊ |
| 13 | * The Original Code and all software distributed under the License are␊ |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| 18 | * Please see the License for the specific language governing rights and␊ |
| 19 | * limitations under the License.␊ |
| 20 | * ␊ |
| 21 | * @APPLE_LICENSE_HEADER_END@␊ |
| 22 | */␊ |
| 23 | /*␊ |
| 24 | * Relocations for x86_64 are a bit different than for other architectures in␊ |
| 25 | * Mach-O: Scattered relocations are not used. Almost all relocations produced␊ |
| 26 | * by the compiler are external relocations. An external relocation has the␊ |
| 27 | * r_extern bit set to 1 and the r_symbolnum field contains the symbol table␊ |
| 28 | * index of the target label.␊ |
| 29 | * ␊ |
| 30 | * When the assembler is generating relocations, if the target label is a local␊ |
| 31 | * label (begins with 'L'), then the previous non-local label in the same␊ |
| 32 | * section is used as the target of the external relocation. An addend is used␊ |
| 33 | * with the distance from that non-local label to the target label. Only when␊ |
| 34 | * there is no previous non-local label in the section is an internal␊ |
| 35 | * relocation used.␊ |
| 36 | * ␊ |
| 37 | * The addend (i.e. the 4 in _foo+4) is encoded in the instruction (Mach-O does␊ |
| 38 | * not have RELA relocations). For PC-relative relocations, the addend is␊ |
| 39 | * stored directly in the instruction. This is different from other Mach-O␊ |
| 40 | * architectures, which encode the addend minus the current section offset.␊ |
| 41 | * ␊ |
| 42 | * The relocation types are:␊ |
| 43 | * ␊ |
| 44 | * ␉X86_64_RELOC_UNSIGNED␉// for absolute addresses␊ |
| 45 | * ␉X86_64_RELOC_SIGNED␉␉// for signed 32-bit displacement␊ |
| 46 | * ␉X86_64_RELOC_BRANCH␉␉// a CALL/JMP instruction with 32-bit displacement␊ |
| 47 | * ␉X86_64_RELOC_GOT_LOAD␉// a MOVQ load of a GOT entry␊ |
| 48 | * ␉X86_64_RELOC_GOT␉␉// other GOT references␊ |
| 49 | * ␉X86_64_RELOC_SUBTRACTOR␉// must be followed by a X86_64_RELOC_UNSIGNED␊ |
| 50 | * ␊ |
| 51 | * The following are sample assembly instructions, followed by the relocation␊ |
| 52 | * and section content they generate in an object file:␊ |
| 53 | * ␊ |
| 54 | * ␉call _foo␊ |
| 55 | * ␉␉r_type=X86_64_RELOC_BRANCH, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 56 | * ␉␉E8 00 00 00 00␊ |
| 57 | * ␊ |
| 58 | * ␉call _foo+4␊ |
| 59 | * ␉␉r_type=X86_64_RELOC_BRANCH, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 60 | * ␉␉E8 04 00 00 00 ␊ |
| 61 | * ␊ |
| 62 | * ␉movq _foo@GOTPCREL(%rip), %rax␊ |
| 63 | * ␉␉r_type=X86_64_RELOC_GOT_LOAD, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 64 | * ␉␉48 8B 05 00 00 00 00␊ |
| 65 | * ␉␊ |
| 66 | * ␉pushq _foo@GOTPCREL(%rip)␊ |
| 67 | * ␉␉r_type=X86_64_RELOC_GOT, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 68 | * ␉␉FF 35 00 00 00 00␊ |
| 69 | * ␉␊ |
| 70 | * ␉movl _foo(%rip), %eax␊ |
| 71 | * ␉␉r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 72 | * ␉␉8B 05 00 00 00 00␊ |
| 73 | * ␊ |
| 74 | * ␉movl _foo+4(%rip), %eax␊ |
| 75 | * ␉␉r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 76 | * ␉␉8B 05 04 00 00 00␊ |
| 77 | * ␊ |
| 78 | * ␉movb $0x12, _foo(%rip)␊ |
| 79 | * ␉␉r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 80 | * ␉␉C6 05 FF FF FF FF 12␊ |
| 81 | * ␊ |
| 82 | * ␉movl $0x12345678, _foo(%rip)␊ |
| 83 | * ␉␉r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo␊ |
| 84 | * ␉␉C7 05 FC FF FF FF 78 56 34 12␊ |
| 85 | * ␊ |
| 86 | * ␉.quad _foo␊ |
| 87 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 88 | * ␉␉00 00 00 00 00 00 00 00␊ |
| 89 | * ␊ |
| 90 | * ␉.quad _foo+4␊ |
| 91 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 92 | * ␉␉04 00 00 00 00 00 00 00␊ |
| 93 | * ␊ |
| 94 | * ␉.quad _foo - _bar␊ |
| 95 | * ␉␉r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_bar␊ |
| 96 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 97 | * ␉␉00 00 00 00 00 00 00 00␊ |
| 98 | * ␊ |
| 99 | * ␉.quad _foo - _bar + 4␊ |
| 100 | * ␉␉r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_bar␊ |
| 101 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 102 | * ␉␉04 00 00 00 00 00 00 00␊ |
| 103 | * ␉␊ |
| 104 | * ␉.long _foo - _bar␊ |
| 105 | * ␉␉r_type=X86_64_RELOC_SUBTRACTOR, r_length=2, r_extern=1, r_pcrel=0, r_symbolnum=_bar␊ |
| 106 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=2, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 107 | * ␉␉00 00 00 00␊ |
| 108 | * ␊ |
| 109 | * ␉lea L1(%rip), %rax␊ |
| 110 | * ␉␉r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_prev␊ |
| 111 | * ␉␉48 8d 05 12 00 00 00␊ |
| 112 | * ␉␉// assumes _prev is the first non-local label 0x12 bytes before L1␊ |
| 113 | * ␊ |
| 114 | * ␉lea L0(%rip), %rax␊ |
| 115 | * ␉␉r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3␊ |
| 116 | * ␉␉48 8d 05 56 00 00 00␊ |
| 117 | *␉␉// assumes L0 is in third section and there is no previous non-local label.␊ |
| 118 | *␉␉// The rip-relative-offset of 0x00000056 is L0-address_of_next_instruction.␊ |
| 119 | *␉␉// address_of_next_instruction is the address of the relocation + 4.␊ |
| 120 | *␊ |
| 121 | * add $6,L0(%rip)␊ |
| 122 | * r_type=X86_64_RELOC_SIGNED_1, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3␊ |
| 123 | *␉␉83 05 18 00 00 00 06␊ |
| 124 | *␉␉// assumes L0 is in third section and there is no previous non-local label.␊ |
| 125 | *␉␉// The rip-relative-offset of 0x00000018 is L0-address_of_next_instruction.␊ |
| 126 | *␉␉// address_of_next_instruction is the address of the relocation + 4 + 1.␊ |
| 127 | *␉␉// The +1 comes from SIGNED_1. This is used because the relocation is not␊ |
| 128 | *␉␉// at the end of the instruction.␊ |
| 129 | *␊ |
| 130 | * ␉.quad L1␊ |
| 131 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev␊ |
| 132 | * ␉␉12 00 00 00 00 00 00 00␊ |
| 133 | * ␉␉// assumes _prev is the first non-local label 0x12 bytes before L1␊ |
| 134 | * ␊ |
| 135 | * ␉.quad L0␊ |
| 136 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=0, r_pcrel=0, r_symbolnum=3␊ |
| 137 | * ␉␉56 00 00 00 00 00 00 00␊ |
| 138 | * ␉␉// assumes L0 is in third section, has an address of 0x00000056 in .o␊ |
| 139 | * ␉␉// file, and there is no previous non-local label␊ |
| 140 | * ␊ |
| 141 | * ␉.quad _foo - .␊ |
| 142 | * ␉␉r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev␊ |
| 143 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 144 | * ␉␉EE FF FF FF FF FF FF FF␊ |
| 145 | * ␉␉// assumes _prev is the first non-local label 0x12 bytes before this␊ |
| 146 | * ␉␉// .quad␊ |
| 147 | * ␊ |
| 148 | * ␉.quad _foo - L1␊ |
| 149 | * ␉␉r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev␊ |
| 150 | * ␉␉r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo␊ |
| 151 | * ␉␉EE FF FF FF FF FF FF FF␊ |
| 152 | * ␉␉// assumes _prev is the first non-local label 0x12 bytes before L1␊ |
| 153 | * ␊ |
| 154 | * ␉.quad L1 - _prev␊ |
| 155 | * ␉␉// No relocations. This is an assembly time constant.␊ |
| 156 | * ␉␉12 00 00 00 00 00 00 00␊ |
| 157 | * ␉␉// assumes _prev is the first non-local label 0x12 bytes before L1␊ |
| 158 | *␊ |
| 159 | *␊ |
| 160 | *␊ |
| 161 | * In final linked images, there are only two valid relocation kinds:␊ |
| 162 | *␊ |
| 163 | * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_pcrel=0, r_extern=1, r_symbolnum=sym_index␊ |
| 164 | *␉This tells dyld to add the address of a symbol to a pointer sized (8-byte)␊ |
| 165 | * piece of data (i.e on disk the 8-byte piece of data contains the addend). The ␊ |
| 166 | * r_symbolnum contains the index into the symbol table of the target symbol.␊ |
| 167 | *␊ |
| 168 | * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_pcrel=0, r_extern=0, r_symbolnum=0␊ |
| 169 | * This tells dyld to adjust the pointer sized (8-byte) piece of data by the amount␊ |
| 170 | * the containing image was loaded from its base address (e.g. slide).␊ |
| 171 | *␊ |
| 172 | */ ␊ |
| 173 | enum reloc_type_x86_64␊ |
| 174 | {␊ |
| 175 | ␉X86_64_RELOC_UNSIGNED,␉␉// for absolute addresses␊ |
| 176 | ␉X86_64_RELOC_SIGNED,␉␉// for signed 32-bit displacement␊ |
| 177 | ␉X86_64_RELOC_BRANCH,␉␉// a CALL/JMP instruction with 32-bit displacement␊ |
| 178 | ␉X86_64_RELOC_GOT_LOAD,␉␉// a MOVQ load of a GOT entry␊ |
| 179 | ␉X86_64_RELOC_GOT,␉␉␉// other GOT references␊ |
| 180 | ␉X86_64_RELOC_SUBTRACTOR,␉// must be followed by a X86_64_RELOC_UNSIGNED␊ |
| 181 | ␉X86_64_RELOC_SIGNED_1,␉␉// for signed 32-bit displacement with a -1 addend␊ |
| 182 | ␉X86_64_RELOC_SIGNED_2,␉␉// for signed 32-bit displacement with a -2 addend␊ |
| 183 | ␉X86_64_RELOC_SIGNED_4,␉␉// for signed 32-bit displacement with a -4 addend␊ |
| 184 | ␉X86_64_RELOC_TLV,␉␉// for thread local variables␊ |
| 185 | };␊ |
| 186 | |
