diff options
Diffstat (limited to 'newlib/libc/sys/linux/dl/do-rel.h')
| -rw-r--r-- | newlib/libc/sys/linux/dl/do-rel.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/dl/do-rel.h b/newlib/libc/sys/linux/dl/do-rel.h new file mode 100644 index 000000000..46202d704 --- /dev/null +++ b/newlib/libc/sys/linux/dl/do-rel.h @@ -0,0 +1,118 @@ +/* Do relocations for ELF dynamic linking. + Copyright (C) 1995,96,97,98,99,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library 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 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* This file may be included twice, to define both + `elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */ + +#include <machine/weakalias.h> + +#ifdef DO_RELA +# 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 +#else +# define RELCOUNT_IDX VERSYMIDX (DT_RELCOUNT) +#endif + +#ifndef VERSYMIDX +# define VERSYMIDX(sym) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (sym)) +#endif + +/* Perform the relocations in MAP on the running program image as specified + by RELTAG, SZTAG. If LAZY is nonzero, this is the first pass on PLT + relocations; they should be set up to call _dl_runtime_resolve, rather + than fully resolved now. */ + +static inline void +elf_dynamic_do_rel (struct link_map *map, + ElfW(Addr) reladdr, ElfW(Addr) relsize, + int lazy) +{ + const ElfW(Rel) *r = (const void *) reladdr; + const ElfW(Rel) *end = (const void *) (reladdr + relsize); + ElfW(Addr) l_addr = map->l_addr; + +#ifndef RTLD_BOOTSTRAP + /* We never bind lazily during ld.so bootstrap. Unfortunately gcc is + not clever enough to see through all the function calls to realize + that. */ + if (lazy) + { + /* Doing lazy PLT relocations; they need very little info. */ + for (; r < end; ++r) + elf_machine_lazy_rel (map, l_addr, r); + } + else +#endif + { + const ElfW(Sym) *const symtab = + (const void *) D_PTR (map, l_info[DT_SYMTAB]); + ElfW(Word) nrelative = (map->l_info[RELCOUNT_IDX] == NULL + ? 0 : map->l_info[RELCOUNT_IDX]->d_un.d_val); + const ElfW(Rel) *relative = r; + r = MIN (r + nrelative, end); + +#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. */ + weak_extern (_dl_rtld_map); + if (map != &_dl_rtld_map) /* Already done in rtld itself. */ +# ifndef DO_RELA + /* 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. */ + if (l_addr != 0) +# endif +#endif + for (; relative < r; ++relative) + elf_machine_rel_relative (l_addr, relative, + (void *) (l_addr + relative->r_offset)); + + if (map->l_info[VERSYMIDX (DT_VERSYM)]) + { + const ElfW(Half) *const version = + (const void *) D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); + + for (; r < end; ++r) + { + ElfW(Half) ndx = version[ELFW(R_SYM) (r->r_info)]; + elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], + &map->l_versions[ndx], + (void *) (l_addr + r->r_offset)); + } + } + else + for (; r < end; ++r) + elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], NULL, + (void *) (l_addr + r->r_offset)); + } +} + +#undef elf_dynamic_do_rel +#undef Rel +#undef elf_machine_rel +#undef elf_machine_rel_relative +#undef RELCOUNT_IDX |