1 /* Transformation functions for ELF data types. 2 Copyright (C) 1998,1999,2000,2002,2004,2005,2006,2007 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 (elf_cvt_Byte) (void *dest, const void *src, size_t n, 53 int encode __attribute__ ((unused))) 54 { 55 memmove (dest, src, n); 56 } 57 58 59 /* We'll optimize the definition of the conversion functions here a 60 bit. We need only functions for 16, 32, and 64 bits. The 61 functions referenced in the table will be aliases for one of these 62 functions. Which one is decided by the ELFxx_FSZ_type. */ 63 64 #if ALLOW_UNALIGNED 65 66 #define FETCH(Bits, ptr) (*(const uint##Bits##_t *) ptr) 67 #define STORE(Bits, ptr, val) (*(uint##Bits##_t *) ptr = val) 68 69 #else 70 71 union unaligned 72 { 73 uint16_t u16; 74 uint32_t u32; 75 uint64_t u64; 76 } __attribute__ ((packed)); 77 78 #define FETCH(Bits, ptr) (((const union unaligned *) ptr)->u##Bits) 79 #define STORE(Bits, ptr, val) (((union unaligned *) ptr)->u##Bits = val) 80 81 #endif 82 83 /* Now define the conversion functions for the basic types. We use here 84 the fact that file and memory types are the same and that we have the 85 ELFxx_FSZ_* macros. 86 87 At the same time we define inline functions which we will use to 88 convert the complex types. */ 89 #define FUNDAMENTAL(NAME, Name, Bits) \ 90 INLINE2 (ELFW2(Bits,FSZ_##NAME), ElfW2(Bits,cvt_##Name), ElfW2(Bits,Name)) 91 #define INLINE2(Bytes, FName, TName) \ 92 INLINE3 (Bytes, FName, TName) 93 #define INLINE3(Bytes, FName, TName) \ 94 static inline void FName##1 (void *dest, const void *ptr) \ 95 { \ 96 switch (Bytes) \ 97 { \ 98 case 2: STORE (16, dest, bswap_16 (FETCH (16, ptr))); break; \ 99 case 4: STORE (32, dest, bswap_32 (FETCH (32, ptr))); break; \ 100 case 8: STORE (64, dest, bswap_64 (FETCH (64, ptr))); break; \ 101 default: \ 102 abort (); \ 103 } \ 104 } \ 105 \ 106 static void FName (void *dest, const void *ptr, size_t len, \ 107 int encode __attribute__ ((unused))) \ 108 { \ 109 size_t n = len / sizeof (TName); \ 110 if (dest < ptr) \ 111 while (n-- > 0) \ 112 { \ 113 FName##1 (dest, ptr); \ 114 dest += Bytes; \ 115 ptr += Bytes; \ 116 } \ 117 else \ 118 { \ 119 dest += len; \ 120 ptr += len; \ 121 while (n-- > 0) \ 122 { \ 123 ptr -= Bytes; \ 124 dest -= Bytes; \ 125 FName##1 (dest, ptr); \ 126 } \ 127 } \ 128 } 129 130 131 /* Now the tricky part: define the transformation functions for the 132 complex types. We will use the definitions of the types in 133 abstract.h. */ 134 #define START(Bits, Name, EName) \ 135 static void \ 136 ElfW2 (Bits, cvt_##Name) (void *dest, const void *src, size_t len, \ 137 int encode __attribute__ ((unused))) \ 138 { ElfW2(Bits, Name) *tdest = (ElfW2(Bits, Name) *) dest; \ 139 ElfW2(Bits, Name) *tsrc = (ElfW2(Bits, Name) *) src; \ 140 size_t n; \ 141 for (n = len / sizeof (ElfW2(Bits, Name)); n > 0; ++tdest, ++tsrc, --n) { 142 #define END(Bits, Name) } } 143 #define TYPE_EXTRA(Code) 144 #define TYPE_XLATE(Code) Code 145 #define TYPE_NAME(Type, Name) TYPE_NAME2 (Type, Name) 146 #define TYPE_NAME2(Type, Name) Type##1 (&tdest->Name, &tsrc->Name); 147 #define TYPE(Name, Bits) TYPE2 (Name, Bits) 148 #define TYPE2(Name, Bits) TYPE3 (Name##Bits) 149 #define TYPE3(Name) Name (cvt_) 150 151 /* Signal that we are generating conversion functions. */ 152 #define GENERATE_CONVERSION 153 154 /* First generate the 32-bit conversion functions. */ 155 #define LIBELFBITS 32 156 #include "gelf_xlate.h" 157 158 /* Now generate the 64-bit conversion functions. */ 159 #define LIBELFBITS 64 160 #include "gelf_xlate.h" 161 162 163 /* We have a few functions which we must create by hand since the sections 164 do not contain records of only one type. */ 165 #include "version_xlate.h" 166 #include "gnuhash_xlate.h" 167 #include "note_xlate.h" 168 169 170 /* Now the externally visible table with the function pointers. */ 171 const xfct_t __elf_xfctstom[EV_NUM - 1][EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] = 172 { 173 [EV_CURRENT - 1] = { 174 [EV_CURRENT - 1] = { 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_note, \ 197 [ELF_T_SYMINFO] = ElfW2(Bits, cvt_Syminfo), \ 198 [ELF_T_MOVE] = ElfW2(Bits, cvt_Move), \ 199 [ELF_T_LIB] = ElfW2(Bits, cvt_Lib), \ 200 [ELF_T_AUXV] = ElfW2(Bits, cvt_auxv_t) 201 define_xfcts (32), 202 [ELF_T_GNUHASH] = Elf32_cvt_Word 203 }, 204 [ELFCLASS64 - 1] = { 205 define_xfcts (64), 206 [ELF_T_GNUHASH] = elf_cvt_gnuhash 207 } 208 } 209 } 210 }; 211 /* For now we only handle the case where the memory representation is the 212 same as the file representation. Should this change we have to define 213 separate functions. For now reuse them. */ 214 strong_alias (__elf_xfctstom, __elf_xfctstof) 215