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1 /*
2  * Copyright (C) 2008 The Android Open Source Project
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *  * Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  *  * Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in
12  *    the documentation and/or other materials provided with the
13  *    distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #pragma once
30 
31 #include <sys/cdefs.h>
32 
33 #include <linux/elf.h>
34 #include <linux/elf-em.h>
35 #undef EI_PAD
36 
37 #include <bits/auxvec.h>
38 #include <bits/elf_common.h>
39 
40 /* http://www.sco.com/developers/gabi/latest/ch4.intro.html */
41 typedef __u64 Elf32_Xword;
42 typedef __s64 Elf32_Sxword;
43 
44 typedef struct {
45   __u32 a_type;
46   union {
47     __u32 a_val;
48   } a_un;
49 } Elf32_auxv_t;
50 
51 typedef struct {
52   __u64 a_type;
53   union {
54     __u64 a_val;
55   } a_un;
56 } Elf64_auxv_t;
57 
58 /* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
59 typedef struct {
60   Elf32_Word ch_type;
61   Elf32_Word ch_size;
62   Elf32_Word ch_addralign;
63 } Elf32_Chdr;
64 typedef struct {
65   Elf64_Word ch_type;
66   Elf64_Word ch_reserved;
67   Elf64_Xword ch_size;
68   Elf64_Xword ch_addralign;
69 } Elf64_Chdr;
70 
71 typedef struct {
72   Elf32_Word l_name;
73   Elf32_Word l_time_stamp;
74   Elf32_Word l_checksum;
75   Elf32_Word l_version;
76   Elf32_Word l_flags;
77 } Elf32_Lib;
78 typedef struct {
79   Elf64_Word l_name;
80   Elf64_Word l_time_stamp;
81   Elf64_Word l_checksum;
82   Elf64_Word l_version;
83   Elf64_Word l_flags;
84 } Elf64_Lib;
85 
86 typedef struct {
87   Elf32_Xword m_value;
88   Elf32_Word m_info;
89   Elf32_Word m_poffset;
90   Elf32_Half m_repeat;
91   Elf32_Half m_stride;
92 } Elf32_Move;
93 typedef struct {
94   Elf64_Xword m_value;
95   Elf64_Xword m_info;
96   Elf64_Xword m_poffset;
97   Elf64_Half m_repeat;
98   Elf64_Half m_stride;
99 } Elf64_Move;
100 
101 typedef __u16 Elf32_Section;
102 typedef __u16 Elf64_Section;
103 
104 typedef struct {
105   Elf32_Half si_boundto;
106   Elf32_Half si_flags;
107 } Elf32_Syminfo;
108 typedef struct {
109   Elf64_Half si_boundto;
110   Elf64_Half si_flags;
111 } Elf64_Syminfo;
112 
113 typedef Elf32_Half Elf32_Versym;
114 typedef Elf64_Half Elf64_Versym;
115 
116 typedef struct {
117   Elf32_Half vd_version;
118   Elf32_Half vd_flags;
119   Elf32_Half vd_ndx;
120   Elf32_Half vd_cnt;
121   Elf32_Word vd_hash;
122   Elf32_Word vd_aux;
123   Elf32_Word vd_next;
124 } Elf32_Verdef;
125 
126 typedef struct {
127   Elf32_Word vda_name;
128   Elf32_Word vda_next;
129 } Elf32_Verdaux;
130 
131 typedef struct {
132   Elf64_Half vd_version;
133   Elf64_Half vd_flags;
134   Elf64_Half vd_ndx;
135   Elf64_Half vd_cnt;
136   Elf64_Word vd_hash;
137   Elf64_Word vd_aux;
138   Elf64_Word vd_next;
139 } Elf64_Verdef;
140 
141 typedef struct {
142   Elf64_Word vda_name;
143   Elf64_Word vda_next;
144 } Elf64_Verdaux;
145 
146 typedef struct {
147   Elf32_Half vn_version;
148   Elf32_Half vn_cnt;
149   Elf32_Word vn_file;
150   Elf32_Word vn_aux;
151   Elf32_Word vn_next;
152 } Elf32_Verneed;
153 
154 typedef struct {
155   Elf32_Word vna_hash;
156   Elf32_Half vna_flags;
157   Elf32_Half vna_other;
158   Elf32_Word vna_name;
159   Elf32_Word vna_next;
160 } Elf32_Vernaux;
161 
162 typedef struct {
163   Elf64_Half vn_version;
164   Elf64_Half vn_cnt;
165   Elf64_Word vn_file;
166   Elf64_Word vn_aux;
167   Elf64_Word vn_next;
168 } Elf64_Verneed;
169 
170 typedef struct {
171   Elf64_Word vna_hash;
172   Elf64_Half vna_flags;
173   Elf64_Half vna_other;
174   Elf64_Word vna_name;
175   Elf64_Word vna_next;
176 } Elf64_Vernaux;
177 
178 /* Relocation table entry for relative (in section of type SHT_RELR). */
179 typedef Elf32_Word Elf32_Relr;
180 typedef Elf64_Xword Elf64_Relr;
181 
182 /* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html */
183 
184 #define DF_1_NOW        0x00000001 /* Perform complete relocation processing. */
185 #define DF_1_GROUP      0x00000004
186 #define DF_1_INITFIRST  0x00000020
187 #define DF_1_DIRECT     0x00000100
188 #define DF_1_TRANS      0x00000200
189 #define DF_1_NODUMP     0x00001000 /* Object cannot be dumped with dldump(3) */
190 #define DF_1_CONFALT    0x00002000
191 #define DF_1_ENDFILTEE  0x00004000
192 #define DF_1_DISPRELDNE 0x00008000
193 #define DF_1_DISPRELPND 0x00010000
194 #define DF_1_NODIRECT   0x00020000
195 #define DF_1_IGNMULDEF  0x00040000 /* Internal use */
196 #define DF_1_NOKSYMS    0x00080000 /* Internal use */
197 #define DF_1_NOHDR      0x00100000 /* Internal use */
198 #define DF_1_EDITED     0x00200000
199 #define DF_1_NORELOC    0x00400000 /* Internal use */
200 #define DF_1_SYMINTPOSE 0x00800000
201 #define DF_1_GLOBAUDIT  0x01000000
202 #define DF_1_SINGLETON  0x02000000
203 #define DF_1_STUB       0x04000000
204 
205 /* http://www.sco.com/developers/gabi/latest/ch4.eheader.html */
206 #define ELFOSABI_SYSV 0 /* Synonym for ELFOSABI_NONE used by valgrind. */
207 #define ELFOSABI_GNU 3 /* Synonym for ELFOSABI_LINUX. */
208 
209 /* http://www.sco.com/developers/gabi/latest/ch4.reloc.html */
210 #define ELF32_R_INFO(sym, type) ((((Elf32_Word)sym) << 8) | ((type) & 0xff))
211 #define ELF64_R_INFO(sym, type) ((((Elf64_Xword)sym) << 32) | ((type) & 0xffffffff))
212 
213 /* http://www.sco.com/developers/gabi/latest/ch4.symtab.html */
214 #undef ELF_ST_TYPE
215 #define ELF_ST_TYPE(x) ((x) & 0xf)
216 #define ELF_ST_INFO(b,t) (((b) << 4) + ((t) & 0xf))
217 #define ELF32_ST_INFO(b,t) ELF_ST_INFO(b,t)
218 #define ELF64_ST_INFO(b,t) ELF_ST_INFO(b,t)
219 
220 /* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
221 #define GRP_MASKOS   0x0ff00000
222 #define GRP_MASKPROC 0xf0000000
223 
224 /* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
225 /*
226  * Standard replacement for SHT_ANDROID_RELR.
227  */
228 #define SHT_RELR 19
229 #undef SHT_NUM
230 #define SHT_NUM 20
231 
232 /*
233  * Experimental support for SHT_RELR sections. For details, see proposal
234  * at https://groups.google.com/forum/#!topic/generic-abi/bX460iggiKg.
235  *
236  * This was eventually replaced by SHT_RELR and DT_RELR (which are identical
237  * other than their different constants), but those constants are only
238  * supported by the OS in API levels >= 30.
239  */
240 #define SHT_ANDROID_RELR 0x6fffff00
241 #define DT_ANDROID_RELR 0x6fffe000
242 #define DT_ANDROID_RELRSZ 0x6fffe001
243 #define DT_ANDROID_RELRENT 0x6fffe003
244 #define DT_ANDROID_RELRCOUNT 0x6fffe005
245 
246 /*
247  * Android compressed REL/RELA sections. These were generated by the relocation
248  * packer in old versions of Android, and can be generated directly by lld
249  * with https://reviews.llvm.org/D39152.
250  *
251  * This was replaced by SHT_ANDROID_RELR in API level 28 (but is supported
252  * in all API levels >= 23).
253  */
254 #define SHT_ANDROID_REL 0x60000001
255 #define SHT_ANDROID_RELA 0x60000002
256 #define DT_ANDROID_REL 0x6000000f // DT_LOOS + 2
257 #define DT_ANDROID_RELSZ 0x60000010 // DT_LOOS + 3
258 #define DT_ANDROID_RELA 0x60000011 // DT_LOOS + 4
259 #define DT_ANDROID_RELASZ 0x60000012 // DT_LOOS + 5
260 
261 /* Linux traditionally doesn't have the trailing 64 that BSD has on these. */
262 #define R_AARCH64_TLS_DTPREL R_AARCH64_TLS_DTPREL64
263 #define R_AARCH64_TLS_DTPMOD R_AARCH64_TLS_DTPMOD64
264 #define R_AARCH64_TLS_TPREL R_AARCH64_TLS_TPREL64
265 
266 /* TODO: upstream these to FreeBSD? */
267 #define R_ARM_TLS_DESC 13
268 #define R_ARM_IRELATIVE 160
269 #define R_X86_64_JUMP_SLOT 7
270