1 /* Common code for ebl reloc functions. 2 Copyright (C) 2005, 2006 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 5 Red Hat elfutils is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by the 7 Free Software Foundation; version 2 of the License. 8 9 Red Hat elfutils is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License along 15 with Red Hat elfutils; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17 18 Red Hat elfutils is an included package of the Open Invention Network. 19 An included package of the Open Invention Network is a package for which 20 Open Invention Network licensees cross-license their patents. No patent 21 license is granted, either expressly or impliedly, by designation as an 22 included package. Should you wish to participate in the Open Invention 23 Network licensing program, please visit www.openinventionnetwork.com 24 <http://www.openinventionnetwork.com>. */ 25 26 #include "libebl_CPU.h" 27 #include <assert.h> 28 29 #define R_TYPE(name) PASTE (RELOC_PREFIX, name) 30 #define PASTE(a, b) PASTE_1 (a, b) 31 #define PASTE_1(a, b) a##b 32 #define R_NAME(name) R_NAME_1 (RELOC_PREFIX, name) 33 #define R_NAME_1(prefix, type) R_NAME_2 (prefix, type) 34 #define R_NAME_2(prefix, type) #prefix #type 35 36 #define RELOC_TYPES STRINGIFIED_PASTE (BACKEND, reloc.def) 37 #define STRINGIFIED_PASTE(a, b) STRINGIFY (PASTE (a, b)) 38 #define STRINGIFY(x) STRINGIFY_1 (x) 39 #define STRINGIFY_1(x) #x 40 41 /* Provide a table of reloc type names, in a PIC-friendly fashion. */ 42 43 static const struct EBLHOOK(reloc_nametable) 44 { 45 char zero; 46 #define RELOC_TYPE(type, uses) \ 47 char name_##type[sizeof R_NAME (type)]; 48 #include RELOC_TYPES 49 #undef RELOC_TYPE 50 } EBLHOOK(reloc_nametable) = 51 { 52 '\0', 53 #define RELOC_TYPE(type, uses) R_NAME (type), 54 #include RELOC_TYPES 55 #undef RELOC_TYPE 56 }; 57 #define reloc_namestr (&EBLHOOK(reloc_nametable).zero) 58 59 static const uint_fast16_t EBLHOOK(reloc_nameidx)[] = 60 { 61 #define RELOC_TYPE(type, uses) \ 62 [R_TYPE (type)] = offsetof (struct EBLHOOK(reloc_nametable), name_##type), 63 #include RELOC_TYPES 64 #undef RELOC_TYPE 65 }; 66 #define nreloc \ 67 ((int) (sizeof EBLHOOK(reloc_nameidx) / sizeof EBLHOOK(reloc_nameidx)[0])) 68 69 #define REL (1 << (ET_REL - 1)) 70 #define EXEC (1 << (ET_EXEC - 1)) 71 #define DYN (1 << (ET_DYN - 1)) 72 static const uint8_t EBLHOOK(reloc_valid)[] = 73 { 74 #define RELOC_TYPE(type, uses) [R_TYPE (type)] = uses, 75 #include RELOC_TYPES 76 #undef RELOC_TYPE 77 }; 78 #undef REL 79 #undef EXEC 80 #undef DYN 81 82 const char * 83 EBLHOOK(reloc_type_name) (int reloc, 84 char *buf __attribute__ ((unused)), 85 size_t len __attribute__ ((unused))) 86 { 87 if (reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0) 88 return &reloc_namestr[EBLHOOK(reloc_nameidx)[reloc]]; 89 return NULL; 90 } 91 92 bool 93 EBLHOOK(reloc_type_check) (int reloc) 94 { 95 return reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0; 96 } 97 98 bool 99 EBLHOOK(reloc_valid_use) (Elf *elf, int reloc) 100 { 101 uint8_t uses = EBLHOOK(reloc_valid)[reloc]; 102 103 GElf_Ehdr ehdr_mem; 104 GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem); 105 assert (ehdr != NULL); 106 uint8_t type = ehdr->e_type; 107 108 return type > ET_NONE && type < ET_CORE && (uses & (1 << (type - 1))); 109 } 110 111 112 bool 113 EBLHOOK(copy_reloc_p) (int reloc) 114 { 115 return reloc == R_TYPE (COPY); 116 } 117 118 bool 119 EBLHOOK(none_reloc_p) (int reloc) 120 { 121 return reloc == R_TYPE (NONE); 122 } 123 124 #ifndef NO_RELATIVE_RELOC 125 bool 126 EBLHOOK(relative_reloc_p) (int reloc) 127 { 128 return reloc == R_TYPE (RELATIVE); 129 } 130 #endif 131 132 static void 133 EBLHOOK(init_reloc) (Ebl *ebl) 134 { 135 ebl->reloc_type_name = EBLHOOK(reloc_type_name); 136 ebl->reloc_type_check = EBLHOOK(reloc_type_check); 137 ebl->reloc_valid_use = EBLHOOK(reloc_valid_use); 138 ebl->copy_reloc_p = EBLHOOK(copy_reloc_p); 139 ebl->none_reloc_p = EBLHOOK(none_reloc_p); 140 #ifndef NO_RELATIVE_RELOC 141 ebl->relative_reloc_p = EBLHOOK(relative_reloc_p); 142 #endif 143 } 144
