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Diffstat (limited to 'REORG.TODO/elf/do-rel.h')
| -rw-r--r-- | REORG.TODO/elf/do-rel.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/REORG.TODO/elf/do-rel.h b/REORG.TODO/elf/do-rel.h new file mode 100644 index 0000000000..70071e5c44 --- /dev/null +++ b/REORG.TODO/elf/do-rel.h @@ -0,0 +1,191 @@ +/* Do relocations for ELF dynamic linking. + Copyright (C) 1995-2017 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, see + <http://www.gnu.org/licenses/>. */ + +/* This file may be included twice, to define both + `elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */ + +#ifdef DO_RELA +# define elf_dynamic_do_Rel elf_dynamic_do_Rela +# define Rel Rela +# define elf_machine_rel elf_machine_rela +# define elf_machine_rel_relative elf_machine_rela_relative +#endif + +#ifndef DO_ELF_MACHINE_REL_RELATIVE +# define DO_ELF_MACHINE_REL_RELATIVE(map, l_addr, relative) \ + elf_machine_rel_relative (l_addr, relative, \ + (void *) (l_addr + relative->r_offset)) +#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. */ + +auto inline void __attribute__ ((always_inline)) +elf_dynamic_do_Rel (struct link_map *map, + ElfW(Addr) reladdr, ElfW(Addr) relsize, + __typeof (((ElfW(Dyn) *) 0)->d_un.d_val) nrelative, + int lazy, int skip_ifunc) +{ + const ElfW(Rel) *r = (const void *) reladdr; + const ElfW(Rel) *end = (const void *) (reladdr + relsize); + ElfW(Addr) l_addr = map->l_addr; +# if defined ELF_MACHINE_IRELATIVE && !defined RTLD_BOOTSTRAP + const ElfW(Rel) *r2 = NULL; + const ElfW(Rel) *end2 = NULL; +# endif + +#if (!defined DO_RELA || !defined ELF_MACHINE_PLT_REL) && !defined 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) +# ifdef ELF_MACHINE_IRELATIVE + if (ELFW(R_TYPE) (r->r_info) == ELF_MACHINE_IRELATIVE) + { + if (r2 == NULL) + r2 = r; + end2 = r; + } + else +# endif + elf_machine_lazy_rel (map, l_addr, r, skip_ifunc); + +# ifdef ELF_MACHINE_IRELATIVE + if (r2 != NULL) + for (; r2 <= end2; ++r2) + if (ELFW(R_TYPE) (r2->r_info) == ELF_MACHINE_IRELATIVE) + elf_machine_lazy_rel (map, l_addr, r2, skip_ifunc); +# endif + } + else +#endif + { + const ElfW(Sym) *const symtab = + (const void *) D_PTR (map, l_info[DT_SYMTAB]); + const ElfW(Rel) *relative = r; + r += nrelative; + +#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. */ +# ifndef SHARED + weak_extern (GL(dl_rtld_map)); +# endif + if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */ +# 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_addr != 0) +# else + /* ...or we know the object has been prelinked. */ + if (l_addr != 0 || ! map->l_info[VALIDX(DT_GNU_PRELINKED)]) +# endif +#endif + for (; relative < r; ++relative) + DO_ELF_MACHINE_REL_RELATIVE (map, l_addr, relative); + +#ifdef RTLD_BOOTSTRAP + /* The dynamic linker always uses versioning. */ + assert (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL); +#else + if (map->l_info[VERSYMIDX (DT_VERSYM)]) +#endif + { + const ElfW(Half) *const version = + (const void *) D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); + + for (; r < end; ++r) + { +#if defined ELF_MACHINE_IRELATIVE && !defined RTLD_BOOTSTRAP + if (ELFW(R_TYPE) (r->r_info) == ELF_MACHINE_IRELATIVE) + { + if (r2 == NULL) + r2 = r; + end2 = r; + continue; + } +#endif + + ElfW(Half) ndx = version[ELFW(R_SYM) (r->r_info)] & 0x7fff; + elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], + &map->l_versions[ndx], + (void *) (l_addr + r->r_offset), skip_ifunc); + } + +#if defined ELF_MACHINE_IRELATIVE && !defined RTLD_BOOTSTRAP + if (r2 != NULL) + for (; r2 <= end2; ++r2) + if (ELFW(R_TYPE) (r2->r_info) == ELF_MACHINE_IRELATIVE) + { + ElfW(Half) ndx + = version[ELFW(R_SYM) (r2->r_info)] & 0x7fff; + elf_machine_rel (map, r2, + &symtab[ELFW(R_SYM) (r2->r_info)], + &map->l_versions[ndx], + (void *) (l_addr + r2->r_offset), + skip_ifunc); + } +#endif + } +#ifndef RTLD_BOOTSTRAP + else + { + for (; r < end; ++r) +# ifdef ELF_MACHINE_IRELATIVE + if (ELFW(R_TYPE) (r->r_info) == ELF_MACHINE_IRELATIVE) + { + if (r2 == NULL) + r2 = r; + end2 = r; + } + else +# endif + elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], NULL, + (void *) (l_addr + r->r_offset), skip_ifunc); + +# ifdef ELF_MACHINE_IRELATIVE + if (r2 != NULL) + for (; r2 <= end2; ++r2) + if (ELFW(R_TYPE) (r2->r_info) == ELF_MACHINE_IRELATIVE) + elf_machine_rel (map, r2, &symtab[ELFW(R_SYM) (r2->r_info)], + NULL, (void *) (l_addr + r2->r_offset), + skip_ifunc); +# endif + } +#endif + } +} + +#undef elf_dynamic_do_Rel +#undef Rel +#undef elf_machine_rel +#undef elf_machine_rel_relative +#undef DO_ELF_MACHINE_REL_RELATIVE +#undef DO_RELA |