diff options
Diffstat (limited to 'newlib/libc/sys/linux/dl/dynamic-link.h')
| -rw-r--r-- | newlib/libc/sys/linux/dl/dynamic-link.h | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/dl/dynamic-link.h b/newlib/libc/sys/linux/dl/dynamic-link.h new file mode 100644 index 000000000..a63fded89 --- /dev/null +++ b/newlib/libc/sys/linux/dl/dynamic-link.h @@ -0,0 +1,244 @@ +/* Inline functions for dynamic linking. + Copyright (C) 1995,96,97,98,99,2000 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. */ + +#include <elf.h> +#include <machine/dl-machine.h> +#include <assert.h> + +#ifndef VERSYMIDX +# define VERSYMIDX(sym) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (sym)) +#endif + + +/* Global read-only variable defined in rtld.c which is nonzero if we + shall give more warning messages. */ +extern int _dl_verbose __attribute__ ((unused)); + + +/* Read the dynamic section at DYN and fill in INFO with indices DT_*. */ + +static inline void __attribute__ ((unused)) +elf_get_dynamic_info (struct link_map *l) +{ + ElfW(Dyn) *dyn = l->l_ld; + ElfW(Addr) l_addr; + ElfW(Dyn) **info; + + if (! dyn) + return; + + l_addr = l->l_addr; + info = l->l_info; + + while (dyn->d_tag != DT_NULL) + { + if (dyn->d_tag < DT_NUM) + info[dyn->d_tag] = dyn; + else if (dyn->d_tag >= DT_LOPROC && + dyn->d_tag < DT_LOPROC + DT_THISPROCNUM) + info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn; + else if ((Elf32_Word) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM) + info[VERSYMIDX (dyn->d_tag)] = dyn; + else if ((Elf32_Word) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM) + info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM + + DT_VERSIONTAGNUM] = dyn; + else + assert (! "bad dynamic tag"); + ++dyn; + } +#ifndef DL_RO_DYN_SECTION + if (info[DT_PLTGOT] != NULL) + info[DT_PLTGOT]->d_un.d_ptr += l_addr; + if (info[DT_STRTAB] != NULL) + info[DT_STRTAB]->d_un.d_ptr += l_addr; + if (info[DT_SYMTAB] != NULL) + info[DT_SYMTAB]->d_un.d_ptr += l_addr; +# if ! ELF_MACHINE_NO_RELA + if (info[DT_RELA] != NULL) + { + assert (info[DT_RELAENT]->d_un.d_val == sizeof (ElfW(Rela))); + info[DT_RELA]->d_un.d_ptr += l_addr; + } +# endif +# if ! ELF_MACHINE_NO_REL + if (info[DT_REL] != NULL) + { + assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel))); + info[DT_REL]->d_un.d_ptr += l_addr; + } +# endif +#endif + if (info[DT_PLTREL] != NULL) + { +# if ELF_MACHINE_NO_RELA + assert (info[DT_PLTREL]->d_un.d_val == DT_REL); +# elif ELF_MACHINE_NO_REL + assert (info[DT_PLTREL]->d_un.d_val == DT_RELA); +# else + assert (info[DT_PLTREL]->d_un.d_val == DT_REL + || info[DT_PLTREL]->d_un.d_val == DT_RELA); +# endif + } +#ifndef DL_RO_DYN_SECTION + if (info[DT_JMPREL] != NULL) + info[DT_JMPREL]->d_un.d_ptr += l_addr; + if (info[VERSYMIDX (DT_VERSYM)] != NULL) + info[VERSYMIDX (DT_VERSYM)]->d_un.d_ptr += l_addr; +#endif + if (info[DT_FLAGS] != NULL) + { + /* Flags are used. Translate to the old form where available. + Since these l_info entries are only tested for NULL pointers it + is ok if they point to the DT_FLAGS entry. */ + ElfW(Word) flags = info[DT_FLAGS]->d_un.d_val; + if (flags & DF_SYMBOLIC) + info[DT_SYMBOLIC] = info[DT_FLAGS]; + if (flags & DF_TEXTREL) + info[DT_TEXTREL] = info[DT_FLAGS]; + if (flags & DF_BIND_NOW) + info[DT_BIND_NOW] = info[DT_FLAGS]; + } + if (info[VERSYMIDX (DT_FLAGS_1)] != NULL) + l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val; + if (info[DT_RUNPATH] != NULL) + /* If both RUNPATH and RPATH are given, the latter is ignored. */ + info[DT_RPATH] = NULL; +} + +#ifdef RESOLVE + +/* 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! + But conditionally define things so that on machines we know this will + not happen we do something more optimal. */ + +# ifdef ELF_MACHINE_PLTREL_OVERLAP +# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, test_rel) \ + do { \ + struct { ElfW(Addr) start, size; int lazy; } ranges[3]; \ + int ranges_index; \ + \ + ranges[0].lazy = ranges[2].lazy = 0; \ + ranges[1].lazy = 1; \ + ranges[0].size = ranges[1].size = ranges[2].size = 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 ((do_lazy) \ + && (map)->l_info[DT_PLTREL] \ + && (!test_rel || (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC)) \ + { \ + ranges[1].start = D_PTR ((map), l_info[DT_JMPREL]); \ + ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ + ranges[2].start = ranges[1].start + ranges[1].size; \ + ranges[2].size = ranges[0].start + ranges[0].size - ranges[2].start; \ + ranges[0].size = ranges[1].start - ranges[0].start; \ + } \ + \ + for (ranges_index = 0; ranges_index < 3; ++ranges_index) \ + elf_dynamic_do_##reloc ((map), \ + ranges[ranges_index].start, \ + ranges[ranges_index].size, \ + ranges[ranges_index].lazy); \ + } while (0) +# else +# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, test_rel) \ + do { \ + struct { ElfW(Addr) start, size; int lazy; } ranges[2]; \ + int ranges_index; \ + ranges[0].lazy = 0; \ + ranges[0].size = ranges[1].size = 0; \ + ranges[0].start = 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[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]); \ + \ + if ((do_lazy) \ + /* This test does not only detect whether the relocation \ + sections are in the right order, it also checks whether \ + there is a DT_REL/DT_RELA section. */ \ + || ranges[0].start + ranges[0].size != start) \ + { \ + ranges[1].start = start; \ + ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ + ranges[1].lazy = (do_lazy); \ + } \ + else \ + /* Combine processing the sections. */ \ + ranges[0].size += (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ + } \ + \ + 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].lazy); \ + } while (0) +# endif + +# 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) \ + _ELF_DYNAMIC_DO_RELOC (REL, rel, map, lazy, _ELF_CHECK_REL) +# else +# define ELF_DYNAMIC_DO_REL(map, lazy) /* Nothing to do. */ +# endif + +# if ! ELF_MACHINE_NO_RELA +# define DO_RELA +# include "do-rel.h" +# define ELF_DYNAMIC_DO_RELA(map, lazy) \ + _ELF_DYNAMIC_DO_RELOC (RELA, rela, map, lazy, _ELF_CHECK_REL) +# else +# define ELF_DYNAMIC_DO_RELA(map, lazy) /* 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) \ + do { \ + int edr_lazy = elf_machine_runtime_setup ((map), (lazy), \ + (consider_profile)); \ + ELF_DYNAMIC_DO_REL ((map), edr_lazy); \ + ELF_DYNAMIC_DO_RELA ((map), edr_lazy); \ + } while (0) + +#endif |