link_elf.c (f6494f2e1360cb4509afbbb2efbe329bfbe8ec4b) link_elf.c (757686b11510174fffffec96b816204c8d659fba)
1/*-
2 * Copyright (c) 1998-2000 Doug Rabson
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 * 1. Redistributions of source code must retain the above copyright

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115static void link_elf_unload_file(linker_file_t);
116static void link_elf_unload_preload(linker_file_t);
117static int link_elf_lookup_set(linker_file_t, const char *,
118 void ***, void ***, int *);
119static int link_elf_each_function_name(linker_file_t,
120 int (*)(const char *, void *),
121 void *);
122static void link_elf_reloc_local(linker_file_t);
1/*-
2 * Copyright (c) 1998-2000 Doug Rabson
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 * 1. Redistributions of source code must retain the above copyright

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115static void link_elf_unload_file(linker_file_t);
116static void link_elf_unload_preload(linker_file_t);
117static int link_elf_lookup_set(linker_file_t, const char *,
118 void ***, void ***, int *);
119static int link_elf_each_function_name(linker_file_t,
120 int (*)(const char *, void *),
121 void *);
122static void link_elf_reloc_local(linker_file_t);
123static Elf_Addr elf_lookup(linker_file_t lf, Elf_Word symidx, int deps);
123static Elf_Addr elf_lookup(linker_file_t lf, Elf_Size symidx, int deps);
124
125static kobj_method_t link_elf_methods[] = {
126 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
127 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
128 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
129 KOBJMETHOD(linker_unload, link_elf_unload_file),
130 KOBJMETHOD(linker_load_file, link_elf_load_file),
131 KOBJMETHOD(linker_link_preload, link_elf_link_preload),

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904static void
905link_elf_unload_preload(linker_file_t file)
906{
907 if (file->filename)
908 preload_delete_name(file->filename);
909}
910
911static const char *
124
125static kobj_method_t link_elf_methods[] = {
126 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
127 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
128 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
129 KOBJMETHOD(linker_unload, link_elf_unload_file),
130 KOBJMETHOD(linker_load_file, link_elf_load_file),
131 KOBJMETHOD(linker_link_preload, link_elf_link_preload),

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904static void
905link_elf_unload_preload(linker_file_t file)
906{
907 if (file->filename)
908 preload_delete_name(file->filename);
909}
910
911static const char *
912symbol_name(elf_file_t ef, Elf_Word r_info)
912symbol_name(elf_file_t ef, Elf_Size r_info)
913{
914 const Elf_Sym *ref;
915
916 if (ELF_R_SYM(r_info)) {
917 ref = ef->symtab + ELF_R_SYM(r_info);
918 return ef->strtab + ref->st_name;
919 } else
920 return NULL;

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1227link_elf_get_gp(linker_file_t lf)
1228{
1229 elf_file_t ef = (elf_file_t)lf;
1230 return (Elf_Addr)ef->got;
1231}
1232#endif
1233
1234const Elf_Sym *
913{
914 const Elf_Sym *ref;
915
916 if (ELF_R_SYM(r_info)) {
917 ref = ef->symtab + ELF_R_SYM(r_info);
918 return ef->strtab + ref->st_name;
919 } else
920 return NULL;

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1227link_elf_get_gp(linker_file_t lf)
1228{
1229 elf_file_t ef = (elf_file_t)lf;
1230 return (Elf_Addr)ef->got;
1231}
1232#endif
1233
1234const Elf_Sym *
1235elf_get_sym(linker_file_t lf, Elf_Word symidx)
1235elf_get_sym(linker_file_t lf, Elf_Size symidx)
1236{
1237 elf_file_t ef = (elf_file_t)lf;
1238
1239 if (symidx >= ef->nchains)
1240 return (NULL);
1241 return (ef->symtab + symidx);
1242}
1243
1244const char *
1236{
1237 elf_file_t ef = (elf_file_t)lf;
1238
1239 if (symidx >= ef->nchains)
1240 return (NULL);
1241 return (ef->symtab + symidx);
1242}
1243
1244const char *
1245elf_get_symname(linker_file_t lf, Elf_Word symidx)
1245elf_get_symname(linker_file_t lf, Elf_Size symidx)
1246{
1247 elf_file_t ef = (elf_file_t)lf;
1248 const Elf_Sym *sym;
1249
1250 if (symidx >= ef->nchains)
1251 return (NULL);
1252 sym = ef->symtab + symidx;
1253 return (ef->strtab + sym->st_name);
1254}
1255
1256/*
1257 * Symbol lookup function that can be used when the symbol index is known (ie
1258 * in relocations). It uses the symbol index instead of doing a fully fledged
1259 * hash table based lookup when such is valid. For example for local symbols.
1260 * This is not only more efficient, it's also more correct. It's not always
1261 * the case that the symbol can be found through the hash table.
1262 */
1263static Elf_Addr
1246{
1247 elf_file_t ef = (elf_file_t)lf;
1248 const Elf_Sym *sym;
1249
1250 if (symidx >= ef->nchains)
1251 return (NULL);
1252 sym = ef->symtab + symidx;
1253 return (ef->strtab + sym->st_name);
1254}
1255
1256/*
1257 * Symbol lookup function that can be used when the symbol index is known (ie
1258 * in relocations). It uses the symbol index instead of doing a fully fledged
1259 * hash table based lookup when such is valid. For example for local symbols.
1260 * This is not only more efficient, it's also more correct. It's not always
1261 * the case that the symbol can be found through the hash table.
1262 */
1263static Elf_Addr
1264elf_lookup(linker_file_t lf, Elf_Word symidx, int deps)
1264elf_lookup(linker_file_t lf, Elf_Size symidx, int deps)
1265{
1266 elf_file_t ef = (elf_file_t)lf;
1267 const Elf_Sym *sym;
1268 const char *symbol;
1269
1270 /* Don't even try to lookup the symbol if the index is bogus. */
1271 if (symidx >= ef->nchains)
1272 return (0);

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1266 elf_file_t ef = (elf_file_t)lf;
1267 const Elf_Sym *sym;
1268 const char *symbol;
1269
1270 /* Don't even try to lookup the symbol if the index is bogus. */
1271 if (symidx >= ef->nchains)
1272 return (0);

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