diff options
Diffstat (limited to 'elf/dynamic-link.h')
-rw-r--r-- | elf/dynamic-link.h | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/elf/dynamic-link.h b/elf/dynamic-link.h deleted file mode 100644 index 60f2d91151..0000000000 --- a/elf/dynamic-link.h +++ /dev/null @@ -1,203 +0,0 @@ -/* Inline functions for 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 macro is used as a callback from elf_machine_rel{a,} when a - static TLS reloc is about to be performed. Since (in dl-load.c) we - permit dynamic loading of objects that might use such relocs, we - have to check whether each use is actually doable. If the object - whose TLS segment the reference resolves to was allocated space in - the static TLS block at startup, then it's ok. Otherwise, we make - an attempt to allocate it in surplus space on the fly. If that - can't be done, we fall back to the error that DF_STATIC_TLS is - intended to produce. */ -#define HAVE_STATIC_TLS(map, sym_map) \ - (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET \ - && ((sym_map)->l_tls_offset \ - != FORCED_DYNAMIC_TLS_OFFSET), 1)) - -#define CHECK_STATIC_TLS(map, sym_map) \ - do { \ - if (!HAVE_STATIC_TLS (map, sym_map)) \ - _dl_allocate_static_tls (sym_map); \ - } while (0) - -#define TRY_STATIC_TLS(map, sym_map) \ - (__builtin_expect ((sym_map)->l_tls_offset \ - != FORCED_DYNAMIC_TLS_OFFSET, 1) \ - && (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET, 1) \ - || _dl_try_allocate_static_tls (sym_map) == 0)) - -int internal_function attribute_hidden - _dl_try_allocate_static_tls (struct link_map *map); - -#include <elf.h> - -#ifdef RESOLVE_MAP -/* We pass reloc_addr as a pointer to void, as opposed to a pointer to - ElfW(Addr), because not all architectures can assume that the - relocated address is properly aligned, whereas the compiler is - entitled to assume that a pointer to a type is properly aligned for - the type. Even if we cast the pointer back to some other type with - less strict alignment requirements, the compiler might still - remember that the pointer was originally more aligned, thereby - optimizing away alignment tests or using word instructions for - copying memory, breaking the very code written to handle the - unaligned cases. */ -# if ! ELF_MACHINE_NO_REL -auto inline void __attribute__((always_inline)) -elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc, - const ElfW(Sym) *sym, const struct r_found_version *version, - void *const reloc_addr, int skip_ifunc); -auto inline void __attribute__((always_inline)) -elf_machine_rel_relative (ElfW(Addr) l_addr, const ElfW(Rel) *reloc, - void *const reloc_addr); -# endif -# if ! ELF_MACHINE_NO_RELA -auto inline void __attribute__((always_inline)) -elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc, - const ElfW(Sym) *sym, const struct r_found_version *version, - void *const reloc_addr, int skip_ifunc); -auto inline void __attribute__((always_inline)) -elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc, - void *const reloc_addr); -# endif -# if ELF_MACHINE_NO_RELA || defined ELF_MACHINE_PLT_REL -auto inline void __attribute__((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - ElfW(Addr) l_addr, const ElfW(Rel) *reloc, - int skip_ifunc); -# else -auto inline void __attribute__((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - ElfW(Addr) l_addr, const ElfW(Rela) *reloc, - int skip_ifunc); -# endif -#endif - -#include <dl-machine.h> - -#include "get-dynamic-info.h" - -#ifdef RESOLVE_MAP - -# ifdef RTLD_BOOTSTRAP -# define ELF_DURING_STARTUP (1) -# else -# define ELF_DURING_STARTUP (0) -# endif - -/* Get the definitions of `elf_dynamic_do_rel' and `elf_dynamic_do_rela'. - These functions are almost identical, so we use cpp magic to avoid - duplicating their code. It cannot be done in a more general function - because we must be able to completely inline. */ - -/* On some machines, notably SPARC, DT_REL* includes DT_JMPREL in its - range. Note that according to the ELF spec, this is completely legal! - - We are guarenteed that we have one of three situations. Either DT_JMPREL - comes immediately after DT_REL*, or there is overlap and DT_JMPREL - consumes precisely the very end of the DT_REL*, or DT_JMPREL and DT_REL* - are completely separate and there is a gap between them. */ - -# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, skip_ifunc, test_rel) \ - do { \ - struct { ElfW(Addr) start, size; \ - __typeof (((ElfW(Dyn) *) 0)->d_un.d_val) nrelative; int lazy; } \ - ranges[2] = { { 0, 0, 0, 0 }, { 0, 0, 0, 0 } }; \ - \ - if ((map)->l_info[DT_##RELOC]) \ - { \ - ranges[0].start = D_PTR ((map), l_info[DT_##RELOC]); \ - ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \ - if (map->l_info[VERSYMIDX (DT_##RELOC##COUNT)] != NULL) \ - ranges[0].nrelative \ - = map->l_info[VERSYMIDX (DT_##RELOC##COUNT)]->d_un.d_val; \ - } \ - if ((map)->l_info[DT_PLTREL] \ - && (!test_rel || (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC)) \ - { \ - ElfW(Addr) start = D_PTR ((map), l_info[DT_JMPREL]); \ - ElfW(Addr) size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ - \ - if (ranges[0].start + ranges[0].size == (start + size)) \ - ranges[0].size -= size; \ - if (ELF_DURING_STARTUP \ - || (!(do_lazy) \ - && (ranges[0].start + ranges[0].size) == start)) \ - { \ - /* Combine processing the sections. */ \ - ranges[0].size += size; \ - } \ - else \ - { \ - ranges[1].start = start; \ - ranges[1].size = size; \ - ranges[1].lazy = (do_lazy); \ - } \ - } \ - \ - if (ELF_DURING_STARTUP) \ - elf_dynamic_do_##reloc ((map), ranges[0].start, ranges[0].size, \ - ranges[0].nrelative, 0, skip_ifunc); \ - else \ - { \ - int ranges_index; \ - for (ranges_index = 0; ranges_index < 2; ++ranges_index) \ - elf_dynamic_do_##reloc ((map), \ - ranges[ranges_index].start, \ - ranges[ranges_index].size, \ - ranges[ranges_index].nrelative, \ - ranges[ranges_index].lazy, \ - skip_ifunc); \ - } \ - } while (0) - -# if ELF_MACHINE_NO_REL || ELF_MACHINE_NO_RELA -# define _ELF_CHECK_REL 0 -# else -# define _ELF_CHECK_REL 1 -# endif - -# if ! ELF_MACHINE_NO_REL -# include "do-rel.h" -# define ELF_DYNAMIC_DO_REL(map, lazy, skip_ifunc) \ - _ELF_DYNAMIC_DO_RELOC (REL, Rel, map, lazy, skip_ifunc, _ELF_CHECK_REL) -# else -# define ELF_DYNAMIC_DO_REL(map, lazy, skip_ifunc) /* Nothing to do. */ -# endif - -# if ! ELF_MACHINE_NO_RELA -# define DO_RELA -# include "do-rel.h" -# define ELF_DYNAMIC_DO_RELA(map, lazy, skip_ifunc) \ - _ELF_DYNAMIC_DO_RELOC (RELA, Rela, map, lazy, skip_ifunc, _ELF_CHECK_REL) -# else -# define ELF_DYNAMIC_DO_RELA(map, lazy, skip_ifunc) /* Nothing to do. */ -# endif - -/* This can't just be an inline function because GCC is too dumb - to inline functions containing inlines themselves. */ -# define ELF_DYNAMIC_RELOCATE(map, lazy, consider_profile, skip_ifunc) \ - do { \ - int edr_lazy = elf_machine_runtime_setup ((map), (lazy), \ - (consider_profile)); \ - ELF_DYNAMIC_DO_REL ((map), edr_lazy, skip_ifunc); \ - ELF_DYNAMIC_DO_RELA ((map), edr_lazy, skip_ifunc); \ - } while (0) - -#endif |