1 /*
2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2018, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 package jdk.tools.jaotc.binformat.elf;
26
27 /**
28 *
29 * Support for the creation of Elf Object files. Current support is limited to 64 bit x86_64.
30 *
31 */
32
33 final class Elf {
34 //@formatter:off
35 /**
36 * Elf64_Ehdr structure defines
37 */
38 enum Elf64_Ehdr {
39 e_ident( 0,16),
40 e_type(16, 2),
41 e_machine(18, 2),
42 e_version(20, 4),
43 e_entry(24, 8),
44 e_phoff(32, 8),
45 e_shoff(40, 8),
46 e_flags(48, 4),
47 e_ehsize(52, 2),
48 e_phentsize(54, 2),
49 e_phnum(56, 2),
50 e_shentsize(58, 2),
51 e_shnum(60, 2),
52 e_shstrndx(62, 2);
53
54 final int off;
55 final int sz;
56
57 Elf64_Ehdr(int offset, int size) {
58 this.off = offset;
59 this.sz = size;
60 }
61
62 static int totalsize = 64;
63
64 /**
65 * Elf64_Ehdr defines
66 */
67
68 /**
69 * e_ident
70 */
71 static final int EI_MAG0 = 0;
72 static final byte ELFMAG0 = 0x7f;
73 static final int EI_MAG1 = 1;
74 static final byte ELFMAG1 = 0x45;
75 static final int EI_MAG2 = 2;
76 static final byte ELFMAG2 = 0x4c;
77 static final int EI_MAG3 = 3;
78 static final byte ELFMAG3 = 0x46;
79 static final int EI_CLASS = 4;
80 static final byte ELFCLASS64 = 0x2;
81
82 static final int EI_DATA = 5;
83 static final byte ELFDATA2LSB = 0x1;
84
85 static final int EI_VERSION = 6;
86 static final byte EV_CURRENT = 0x1;
87
88 static final int EI_OSABI = 7;
89 static final byte ELFOSABI_NONE = 0x0;
90
91 /**
92 * e_type
93 */
94 static final char ET_REL = 0x1;
95
96 /**
97 * e_machine
98 */
99 static final char EM_NONE = 0;
100 static final char EM_X86_64 = 62;
101 static final char EM_AARCH64 = 183;
102
103 }
104
105 /**
106 * Elf64_Shdr structure defines
107 */
108 enum Elf64_Shdr {
109 sh_name( 0, 4),
110 sh_type( 4, 4),
111 sh_flags( 8, 8),
112 sh_addr(16, 8),
113 sh_offset(24, 8),
114 sh_size(32, 8),
115 sh_link(40, 4),
116 sh_info(44, 4),
117 sh_addralign(48, 8),
118 sh_entsize(56, 8);
119
120 final int off;
121 final int sz;
122
123 Elf64_Shdr(int offset, int size) {
124 this.off = offset;
125 this.sz = size;
126 }
127
128 static int totalsize = 64;
129
130 /**
131 * Elf64_Shdr defines
132 */
133
134 /**
135 * sh_type
136 */
137 static final int SHT_PROGBITS = 0x1;
138 static final int SHT_SYMTAB = 0x2;
139 static final int SHT_STRTAB = 0x3;
140 static final int SHT_RELA = 0x4;
141 static final int SHT_NOBITS = 0x8;
142 static final int SHT_REL = 0x9;
143
144 static final byte SHN_UNDEF = 0x0;
145
146 /**
147 * sh_flag
148 */
149 static final int SHF_WRITE = 0x1;
150 static final int SHF_ALLOC = 0x2;
151 static final int SHF_EXECINSTR = 0x4;
152
153 }
154
155 /**
156 * Symbol table entry definitions
157 *
158 * Elf64_Sym structure defines
159 */
160 enum Elf64_Sym {
161 st_name( 0, 4),
162 st_info( 4, 1),
163 st_other( 5, 1),
164 st_shndx( 6, 2),
165 st_value( 8, 8),
166 st_size(16, 8);
167
168 final int off;
169 final int sz;
170
171 Elf64_Sym(int offset, int size) {
172 this.off = offset;
173 this.sz = size;
174 }
175
176 static int totalsize = 24;
177
178 /* ST_BIND is in bits 4-7 of st_info. ST_TYPE is in low 4 bits */
179 static final byte STB_LOCAL = 0x0;
180 static final byte STB_GLOBAL = 0x1;
181
182 static final byte STT_NOTYPE = 0x0;
183 static final byte STT_OBJECT = 0x1;
184 static final byte STT_FUNC = 0x2;
185
186 static byte ELF64_ST_INFO(byte bind, byte type) {
187 return (byte)(((bind) << 4) + ((type) & 0xf));
188 }
189
190 }
191
192 /**
193 * Elf64_Rel structure defines
194 */
195 enum Elf64_Rel {
196 r_offset( 0, 8),
197 r_info( 8, 8);
198
199 final int off;
200 final int sz;
201
202 Elf64_Rel(int offset, int size) {
203 this.off = offset;
204 this.sz = size;
205 }
206
207 static int totalsize = 16;
208
209 /**
210 * Relocation types
211 */
212
213 static final int R_X86_64_NONE = 0x0;
214 static final int R_X86_64_64 = 0x1;
215 static final int R_X86_64_PC32 = 0x2;
216 static final int R_X86_64_PLT32 = 0x4;
217 static final int R_X86_64_GOTPCREL = 0x9;
218
219 static final int R_AARCH64_NONE = 256;
220 static final int R_AARCH64_ABS64 = 257;
221 static final int R_AARCH64_CALL26 = 283;
222 static final int R_AARCH64_ADR_GOT_PAGE = 311;
223 static final int R_AARCH64_LD64_GOT_LO12_NC = 312;
224
225 static final int R_AARCH64_MOVW_UABS_G0_NC = 264;
226 static final int R_AARCH64_MOVW_UABS_G1_NC = 266;
227 static final int R_AARCH64_MOVW_UABS_G2_NC = 268;
228
229 static final int R_AARCH64_ADR_PREL_PG_HI21 = 275;
230 static final int R_AARCH64_ADD_ABS_LO12_NC = 277;
231 static final int R_AARCH64_LDST64_ABS_LO12_NC = 286;
232 }
233
234 /**
235 * Elf64_Rela structure defines
236 */
237 enum Elf64_Rela {
238 r_offset( 0, 8),
239 r_info( 8, 8),
240 r_addend(16, 8);
241
242 final int off;
243 final int sz;
244
245 Elf64_Rela(int offset, int size) {
246 this.off = offset;
247 this.sz = size;
248 }
249
250 static int totalsize = 24;
251
252 static final int R_X86_64_NONE = 0x0;
253 static final int R_X86_64_64 = 0x1;
254 static final int R_X86_64_PC32 = 0x2;
255 static final int R_X86_64_PLT32 = 0x4;
256 static final int R_X86_64_GOTPCREL = 0x9;
257
258 static final int R_AARCH64_NONE = 256;
259 static final int R_AARCH64_ABS64 = 257;
260 static final int R_AARCH64_CALL26 = 283;
261 static final int R_AARCH64_ADR_GOT_PAGE = 311;
262 static final int R_AARCH64_LD64_GOT_LO12_NC = 312;
263
264 static final int R_AARCH64_MOVW_UABS_G0_NC = 264;
265 static final int R_AARCH64_MOVW_UABS_G1_NC = 266;
266 static final int R_AARCH64_MOVW_UABS_G2_NC = 268;
267
268 static final int R_AARCH64_ADR_PREL_PG_HI21 = 275;
269 static final int R_AARCH64_ADD_ABS_LO12_NC = 277;
270 static final int R_AARCH64_LDST64_ABS_LO12_NC = 286;
271
272 static long ELF64_R_INFO(int symidx, int type) {
273 return (((long)symidx << 32) + type);
274 }
275
276 }
277 //@formatter:on
278 }