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- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * do-rel.h
- *
- * This files contain architecture-independent macros of ELF dynamic
- * relocation function.
- * The source code is imported and modified from the GNU C Library.
- */
- #include <pal_rtld.h>
- #include "dl-machine-x86_64.h"
- #define elf_dynamic_do_rel elf_dynamic_do_rela
- #define RELCOUNT_IDX VERSYMIDX(DT_RELACOUNT)
- #define Rel Rela
- #define elf_machine_rel elf_machine_rela
- #define elf_machine_rel_relative elf_machine_rela_relative
- #ifndef DO_ELF_MACHINE_REL_RELATIVE
- #define DO_ELF_MACHINE_REL_RELATIVE(l, relative) \
- elf_machine_rel_relative(l, relative, (void*)(l->l_addr + relative->r_offset))
- #endif
- static void __attribute_unused elf_dynamic_do_rel(struct link_map* l, ElfW(Addr) reladdr,
- int relsize) {
- if (!l->l_info[DT_SYMTAB])
- return;
- ElfW(Rel)* r = (void*)reladdr, *end = (void*)(reladdr + relsize);
- ElfW(Sym)* symtab = (void*)D_PTR(l->l_info[DT_SYMTAB]);
- ElfW(Word) nrelative = l->l_info[RELCOUNT_IDX] ? l->l_info[RELCOUNT_IDX]->d_un.d_val : 0;
- ElfW(Rel)* relative = r;
- r = r + MIN(nrelative, relsize / sizeof(ElfW(Rel)));
- #ifndef RTLD_BOOTSTRAP
- /* This is defined in rtld.c, but nowhere in the static libc.a; make
- the reference weak so static programs can still link. This
- declaration cannot be done when compiling rtld.c (i.e. #ifdef
- RTLD_BOOTSTRAP) because rtld.c contains the common defn for
- _dl_rtld_map, which is incompatible with a weak decl in the same
- file. */
- #if !defined DO_RELA || defined ELF_MACHINE_REL_RELATIVE
- /* Rela platforms get the offset from r_addend and this must
- be copied in the relocation address. Therefore we can skip
- the relative relocations only if this is for rel
- relocations or rela relocations if they are computed as
- memory_loc += l_addr... */
- if (l->l_addr != 0)
- #else
- /* ...or we know the object has been prelinked. */
- if (l->l_addr != 0 || !l->l_info[VALIDX(DT_GNU_PRELINKED)])
- #endif
- #endif
- for (; relative < r; ++relative) {
- DO_ELF_MACHINE_REL_RELATIVE(l, relative);
- }
- for (; r < end; ++r) {
- elf_machine_rel(l, r, &symtab[ELFW(R_SYM)(r->r_info)], (void*)(l->l_addr + r->r_offset));
- }
- }
- #undef elf_dynamic_do_rel
- #undef Rel
- #undef elf_machine_rel
- #undef elf_machine_rel_relative
- #undef DO_ELF_MACHINE_REL_RELATIVE
- #undef RELCOUNT_IDX
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