Line data Source code
1 : /* Transformation functions for ELF data types.
2 : Copyright (C) 1998,1999,2000,2002,2004,2005,2006,2007,2015 Red Hat, Inc.
3 : This file is part of elfutils.
4 : Written by Ulrich Drepper <drepper@redhat.com>, 1998.
5 :
6 : This file is free software; you can redistribute it and/or modify
7 : it under the terms of either
8 :
9 : * the GNU Lesser General Public License as published by the Free
10 : Software Foundation; either version 3 of the License, or (at
11 : your option) any later version
12 :
13 : or
14 :
15 : * the GNU General Public License as published by the Free
16 : Software Foundation; either version 2 of the License, or (at
17 : your option) any later version
18 :
19 : or both in parallel, as here.
20 :
21 : elfutils is distributed in the hope that it will be useful, but
22 : WITHOUT ANY WARRANTY; without even the implied warranty of
23 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : General Public License for more details.
25 :
26 : You should have received copies of the GNU General Public License and
27 : the GNU Lesser General Public License along with this program. If
28 : not, see <http://www.gnu.org/licenses/>. */
29 :
30 : #ifdef HAVE_CONFIG_H
31 : # include <config.h>
32 : #endif
33 :
34 : #include <byteswap.h>
35 : #include <stdint.h>
36 : #include <string.h>
37 : #include <stdlib.h>
38 :
39 : #include "libelfP.h"
40 :
41 : #ifndef LIBELFBITS
42 : # define LIBELFBITS 32
43 : #endif
44 :
45 :
46 : /* Well, what shall I say. Nothing to do here. */
47 : #define elf_cvt_Byte(dest, src, n) \
48 : (__builtin_constant_p (n) && (n) == 1 \
49 : ? (void) (*((char *) (dest)) = *((char *) (src))) \
50 : : Elf32_cvt_Byte (dest, src, n))
51 : static void
52 788157 : (elf_cvt_Byte) (void *dest, const void *src, size_t n,
53 : int encode __attribute__ ((unused)))
54 : {
55 788157 : if (n != 0)
56 788056 : memmove (dest, src, n);
57 788157 : }
58 :
59 :
60 : /* We'll optimize the definition of the conversion functions here a
61 : bit. We need only functions for 16, 32, and 64 bits. The
62 : functions referenced in the table will be aliases for one of these
63 : functions. Which one is decided by the ELFxx_FSZ_type. */
64 :
65 : #if ALLOW_UNALIGNED
66 :
67 : #define FETCH(Bits, ptr) (*(const uint##Bits##_t *) ptr)
68 : #define STORE(Bits, ptr, val) (*(uint##Bits##_t *) ptr = val)
69 :
70 : #else
71 :
72 : union unaligned
73 : {
74 : uint16_t u16;
75 : uint32_t u32;
76 : uint64_t u64;
77 : } attribute_packed;
78 :
79 : #define FETCH(Bits, ptr) (((const union unaligned *) ptr)->u##Bits)
80 : #define STORE(Bits, ptr, val) (((union unaligned *) ptr)->u##Bits = val)
81 :
82 : #endif
83 :
84 : /* Now define the conversion functions for the basic types. We use here
85 : the fact that file and memory types are the same and that we have the
86 : ELFxx_FSZ_* macros.
87 :
88 : At the same time we define inline functions which we will use to
89 : convert the complex types. */
90 : #define FUNDAMENTAL(NAME, Name, Bits) \
91 : INLINE2 (ELFW2(Bits,FSZ_##NAME), ElfW2(Bits,cvt_##Name), ElfW2(Bits,Name))
92 : #define INLINE2(Bytes, FName, TName) \
93 : INLINE3 (Bytes, FName, TName)
94 : #define INLINE3(Bytes, FName, TName) \
95 : static inline void FName##1 (void *dest, const void *ptr) \
96 : { \
97 : switch (Bytes) \
98 : { \
99 : case 2: STORE (16, dest, bswap_16 (FETCH (16, ptr))); break; \
100 : case 4: STORE (32, dest, bswap_32 (FETCH (32, ptr))); break; \
101 : case 8: STORE (64, dest, bswap_64 (FETCH (64, ptr))); break; \
102 : default: \
103 : abort (); \
104 : } \
105 : } \
106 : \
107 : static void FName (void *dest, const void *ptr, size_t len, \
108 : int encode __attribute__ ((unused))) \
109 : { \
110 : size_t n = len / sizeof (TName); \
111 : if (dest < ptr) \
112 : while (n-- > 0) \
113 : { \
114 : FName##1 (dest, ptr); \
115 : dest += Bytes; \
116 : ptr += Bytes; \
117 : } \
118 : else \
119 : { \
120 : dest += len; \
121 : ptr += len; \
122 : while (n-- > 0) \
123 : { \
124 : ptr -= Bytes; \
125 : dest -= Bytes; \
126 : FName##1 (dest, ptr); \
127 : } \
128 : } \
129 : }
130 :
131 :
132 : /* Now the tricky part: define the transformation functions for the
133 : complex types. We will use the definitions of the types in
134 : abstract.h. */
135 : #define START(Bits, Name, EName) \
136 : static void \
137 : ElfW2 (Bits, cvt_##Name) (void *dest, const void *src, size_t len, \
138 : int encode __attribute__ ((unused))) \
139 : { ElfW2(Bits, Name) *tdest = (ElfW2(Bits, Name) *) dest; \
140 : ElfW2(Bits, Name) *tsrc = (ElfW2(Bits, Name) *) src; \
141 : size_t n; \
142 : for (n = len / sizeof (ElfW2(Bits, Name)); n > 0; ++tdest, ++tsrc, --n) {
143 : #define END(Bits, Name) } }
144 : #define TYPE_EXTRA(Code)
145 : #define TYPE_XLATE(Code) Code
146 : #define TYPE_NAME(Type, Name) TYPE_NAME2 (Type, Name)
147 : #define TYPE_NAME2(Type, Name) Type##1 (&tdest->Name, &tsrc->Name);
148 : #define TYPE(Name, Bits) TYPE2 (Name, Bits)
149 : #define TYPE2(Name, Bits) TYPE3 (Name##Bits)
150 : #define TYPE3(Name) Name (cvt_)
151 :
152 : /* Signal that we are generating conversion functions. */
153 : #define GENERATE_CONVERSION
154 :
155 : /* First generate the 32-bit conversion functions. */
156 : #define LIBELFBITS 32
157 : #include "gelf_xlate.h"
158 :
159 : /* Now generate the 64-bit conversion functions. */
160 : #define LIBELFBITS 64
161 : #include "gelf_xlate.h"
162 :
163 :
164 : /* We have a few functions which we must create by hand since the sections
165 : do not contain records of only one type. */
166 : #include "version_xlate.h"
167 : #include "gnuhash_xlate.h"
168 : #include "note_xlate.h"
169 : #include "chdr_xlate.h"
170 :
171 :
172 : /* Now the externally visible table with the function pointers. */
173 : const xfct_t __elf_xfctstom[ELFCLASSNUM - 1][ELF_T_NUM] =
174 : {
175 : [ELFCLASS32 - 1] = {
176 : #define define_xfcts(Bits) \
177 : [ELF_T_BYTE] = elf_cvt_Byte, \
178 : [ELF_T_ADDR] = ElfW2(Bits, cvt_Addr), \
179 : [ELF_T_DYN] = ElfW2(Bits, cvt_Dyn), \
180 : [ELF_T_EHDR] = ElfW2(Bits, cvt_Ehdr), \
181 : [ELF_T_HALF] = ElfW2(Bits, cvt_Half), \
182 : [ELF_T_OFF] = ElfW2(Bits, cvt_Off), \
183 : [ELF_T_PHDR] = ElfW2(Bits, cvt_Phdr), \
184 : [ELF_T_RELA] = ElfW2(Bits, cvt_Rela), \
185 : [ELF_T_REL] = ElfW2(Bits, cvt_Rel), \
186 : [ELF_T_SHDR] = ElfW2(Bits, cvt_Shdr), \
187 : [ELF_T_SWORD] = ElfW2(Bits, cvt_Sword), \
188 : [ELF_T_SYM] = ElfW2(Bits, cvt_Sym), \
189 : [ELF_T_WORD] = ElfW2(Bits, cvt_Word), \
190 : [ELF_T_XWORD] = ElfW2(Bits, cvt_Xword), \
191 : [ELF_T_SXWORD] = ElfW2(Bits, cvt_Sxword), \
192 : [ELF_T_VDEF] = elf_cvt_Verdef, \
193 : [ELF_T_VDAUX] = elf_cvt_Verdef, \
194 : [ELF_T_VNEED] = elf_cvt_Verneed, \
195 : [ELF_T_VNAUX] = elf_cvt_Verneed, \
196 : [ELF_T_NHDR] = elf_cvt_note4, \
197 : [ELF_T_NHDR8] = elf_cvt_note8, \
198 : [ELF_T_SYMINFO] = ElfW2(Bits, cvt_Syminfo), \
199 : [ELF_T_MOVE] = ElfW2(Bits, cvt_Move), \
200 : [ELF_T_LIB] = ElfW2(Bits, cvt_Lib), \
201 : [ELF_T_AUXV] = ElfW2(Bits, cvt_auxv_t), \
202 : [ELF_T_CHDR] = ElfW2(Bits, cvt_chdr)
203 : define_xfcts (32),
204 : [ELF_T_GNUHASH] = Elf32_cvt_Word
205 : },
206 : [ELFCLASS64 - 1] = {
207 : define_xfcts (64),
208 : [ELF_T_GNUHASH] = elf_cvt_gnuhash
209 : }
210 : };
|