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ea3ce762 MC |
1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Marcus Comstedt <marcus@mc.pp.se> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | package org.sigrok.androidutils.ant; | |
21 | ||
22 | import java.io.File; | |
23 | import java.io.IOException; | |
24 | import java.io.RandomAccessFile; | |
25 | ||
26 | class ElfFile | |
27 | { | |
28 | public static final int SHT_NULL = 0; | |
29 | public static final int SHT_PROGBITS = 1; | |
30 | public static final int SHT_SYMTAB = 2; | |
31 | public static final int SHT_STRTAB = 3; | |
32 | public static final int SHT_RELA = 4; | |
33 | public static final int SHT_HASH = 5; | |
34 | public static final int SHT_DYNAMIC = 6; | |
35 | public static final int SHT_NOTE = 7; | |
36 | public static final int SHT_NOBITS = 8; | |
37 | public static final int SHT_REL = 9; | |
38 | public static final int SHT_SHLIB = 10; | |
39 | public static final int SHT_DYNSYM = 11; | |
40 | public static final int SHT_INIT_ARRAY = 14; | |
41 | public static final int SHT_FINI_ARRAY = 15; | |
42 | public static final int SHT_PREINIT_ARRAY = 16; | |
43 | public static final int SHT_GROUP = 17; | |
44 | public static final int SHT_SYMTAB_SHNDX = 18; | |
45 | ||
46 | public static final int DT_NULL = 0; | |
47 | public static final int DT_NEEDED = 1; | |
48 | public static final int DT_PLTRELSZ = 2; | |
49 | public static final int DT_PLTGOT = 3; | |
50 | public static final int DT_HASH = 4; | |
51 | public static final int DT_STRTAB = 5; | |
52 | public static final int DT_SYMTAB = 6; | |
53 | public static final int DT_RELA = 7; | |
54 | public static final int DT_RELASZ = 8; | |
55 | public static final int DT_RELAENT = 9; | |
56 | public static final int DT_STRSZ = 10; | |
57 | public static final int DT_SYMENT = 11; | |
58 | public static final int DT_INIT = 12; | |
59 | public static final int DT_FINI = 13; | |
60 | public static final int DT_SONAME = 14; | |
61 | public static final int DT_RPATH = 15; | |
62 | public static final int DT_SYMBOLIC = 16; | |
63 | public static final int DT_REL = 17; | |
64 | public static final int DT_RELSZ = 18; | |
65 | public static final int DT_RELENT = 19; | |
66 | public static final int DT_PLTREL = 20; | |
67 | public static final int DT_DEBUG = 21; | |
68 | public static final int DT_TEXTREL = 22; | |
69 | public static final int DT_JMPREL = 23; | |
70 | public static final int DT_BIND_NOW = 24; | |
71 | public static final int DT_INIT_ARRAY = 25; | |
72 | public static final int DT_FINI_ARRAY = 26; | |
73 | public static final int DT_INIT_ARRAYSZ = 27; | |
74 | public static final int DT_FINI_ARRAYSZ = 28; | |
75 | public static final int DT_RUNPATH = 29; | |
76 | public static final int DT_FLAGS = 30; | |
77 | public static final int DT_ENCODING = 32; | |
78 | public static final int DT_PREINIT_ARRAY = 32; | |
79 | public static final int DT_PREINIT_ARRAYSZ = 33; | |
80 | ||
81 | protected final RandomAccessFile file; | |
82 | protected final boolean bit64, little; | |
83 | public final Header header; | |
84 | public final SectionHeader[] secHeaders; | |
85 | ||
86 | protected short swap(short s) | |
87 | { | |
88 | return (little? (short)(((s&0xff)<<8)|((s>>8)&0xff)) : s); | |
89 | } | |
90 | ||
91 | protected int swap(int i) | |
92 | { | |
93 | return (little? (((i&0xff)<<24)|((i&0xff00)<<8)| | |
94 | ((i>>8)&0xff00)|((i>>24)&0xff)) : i); | |
95 | } | |
96 | ||
97 | protected long swap(long l) | |
98 | { | |
99 | return (little? ((((long)swap((int)(l&0xffffffffL)))<<32) | | |
100 | (((long)swap((int)((l>>32)&0xffffffffL)))&0xffffffffL)) | |
101 | : l); | |
102 | } | |
103 | ||
104 | protected short getHalf() throws IOException | |
105 | { | |
106 | return swap(file.readShort()); | |
107 | } | |
108 | ||
109 | protected int getWord() throws IOException | |
110 | { | |
111 | return swap(file.readInt()); | |
112 | } | |
113 | ||
114 | protected long getXword() throws IOException | |
115 | { | |
116 | return swap(file.readLong()); | |
117 | } | |
118 | ||
119 | protected long getAddr() throws IOException | |
120 | { | |
121 | return (bit64? getXword() : getWord()); | |
122 | } | |
123 | ||
124 | protected long getOff() throws IOException | |
125 | { | |
126 | return (bit64? getXword() : getWord()); | |
127 | } | |
128 | ||
129 | public class Header | |
130 | { | |
131 | public final byte[] e_ident; | |
132 | public final short e_type, e_machine; | |
133 | public final int e_version; | |
134 | public final long e_entry, e_phoff, e_shoff; | |
135 | public final int e_flags; | |
136 | public final short e_ehsize, e_phentsize, e_phnum; | |
137 | public final short e_shentsize, e_shnum, e_shstrndx; | |
138 | ||
139 | private Header(byte[] ident) throws IOException | |
140 | { | |
141 | e_ident = ident; | |
142 | e_type = getHalf(); | |
143 | e_machine = getHalf(); | |
144 | e_version = getWord(); | |
145 | e_entry = getAddr(); | |
146 | e_phoff = getOff(); | |
147 | e_shoff = getOff(); | |
148 | e_flags = getWord(); | |
149 | e_ehsize = getHalf(); | |
150 | e_phentsize = getHalf(); | |
151 | e_phnum = getHalf(); | |
152 | e_shentsize = getHalf(); | |
153 | e_shnum = getHalf(); | |
154 | e_shstrndx = getHalf(); | |
155 | } | |
156 | } | |
157 | ||
158 | public class SectionHeader | |
159 | { | |
160 | public final int sh_name, sh_type; | |
161 | public final long sh_flags, sh_addr, sh_offset, sh_size; | |
162 | public final int sh_link, sh_info; | |
163 | public final long sh_addralign, sh_entsize; | |
164 | ||
165 | private SectionHeader() throws IOException | |
166 | { | |
167 | sh_name = getWord(); | |
168 | sh_type = getWord(); | |
169 | sh_flags = (bit64? getXword() : getWord()); | |
170 | sh_addr = getAddr(); | |
171 | sh_offset = getOff(); | |
172 | sh_size = (bit64? getXword() : getWord()); | |
173 | sh_link = getWord(); | |
174 | sh_info = getWord(); | |
175 | if (bit64) { | |
176 | sh_addralign = getXword(); | |
177 | sh_entsize = getXword(); | |
178 | } else { | |
179 | sh_addralign = getWord(); | |
180 | sh_entsize = getWord(); | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | public class Dynamic | |
186 | { | |
187 | public final long d_tag, d_val; | |
188 | ||
189 | private Dynamic() throws IOException | |
190 | { | |
191 | if (bit64) { | |
192 | d_tag = getXword(); | |
193 | d_val = getXword(); | |
194 | } else { | |
195 | d_tag = getWord(); | |
196 | d_val = getWord(); | |
197 | } | |
198 | } | |
199 | } | |
200 | ||
201 | public Dynamic[] readDynamic(SectionHeader sh) throws IOException | |
202 | { | |
203 | file.seek(sh.sh_offset); | |
204 | Dynamic[] dyn = new Dynamic[(int)(sh.sh_size/sh.sh_entsize)]; | |
205 | for (int i=0; i<dyn.length; i++) | |
206 | dyn[i] = new Dynamic(); | |
207 | return dyn; | |
208 | } | |
209 | ||
210 | public void read(SectionHeader sh, byte[] buf) throws Exception | |
211 | { | |
212 | if (sh.sh_type == SHT_NOBITS || buf.length > sh.sh_size) | |
213 | throw new Exception("Illegal read"); | |
214 | file.seek(sh.sh_offset); | |
215 | file.readFully(buf); | |
216 | } | |
217 | ||
218 | public ElfFile(File f) throws Exception | |
219 | { | |
220 | file = new RandomAccessFile(f, "r"); | |
221 | file.seek(0); | |
222 | byte[] ident = new byte[16]; | |
223 | file.readFully(ident); | |
224 | if (ident[0] != 0x7f || ident[1] != 'E' || | |
225 | ident[2] != 'L' || ident[3] != 'F') | |
226 | throw new Exception("ELF signature not found"); | |
227 | if (ident[4] == 1) | |
228 | bit64 = false; | |
229 | else if (ident[4] == 2) | |
230 | bit64 = true; | |
231 | else | |
232 | throw new Exception("Invalid ELF file class"); | |
233 | if (ident[5] == 1) | |
234 | little = true; | |
235 | else if (ident[5] == 2) | |
236 | little = false; | |
237 | else | |
238 | throw new Exception("Invalid ELF data encoding"); | |
239 | header = new Header(ident); | |
240 | file.seek(header.e_shoff); | |
241 | secHeaders = new SectionHeader[header.e_shnum]; | |
242 | for (int i=0; i<header.e_shnum; i++) | |
243 | secHeaders[i] = new SectionHeader(); | |
244 | } | |
245 | } |