diff options
Diffstat (limited to 'elf/setup-vdso.h')
| -rw-r--r-- | elf/setup-vdso.h | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/elf/setup-vdso.h b/elf/setup-vdso.h deleted file mode 100644 index 2db597eba3..0000000000 --- a/elf/setup-vdso.h +++ /dev/null @@ -1,121 +0,0 @@ -/* Set up the data structures for the system-supplied DSO. - Copyright (C) 2012-2017 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/>. */ - -static inline void __attribute__ ((always_inline)) -setup_vdso (struct link_map *main_map __attribute__ ((unused)), - struct link_map ***first_preload __attribute__ ((unused))) -{ -#ifdef NEED_DL_SYSINFO_DSO - if (GLRO(dl_sysinfo_dso) == NULL) - return; - - /* Do an abridged version of the work _dl_map_object_from_fd would do - to map in the object. It's already mapped and prelinked (and - better be, since it's read-only and so we couldn't relocate it). - We just want our data structures to describe it as if we had just - mapped and relocated it normally. */ - struct link_map *l = _dl_new_object ((char *) "", "", lt_library, NULL, - 0, LM_ID_BASE); - if (__glibc_likely (l != NULL)) - { - static ElfW(Dyn) dyn_temp[DL_RO_DYN_TEMP_CNT] attribute_relro; - - l->l_phdr = ((const void *) GLRO(dl_sysinfo_dso) - + GLRO(dl_sysinfo_dso)->e_phoff); - l->l_phnum = GLRO(dl_sysinfo_dso)->e_phnum; - for (uint_fast16_t i = 0; i < l->l_phnum; ++i) - { - const ElfW(Phdr) *const ph = &l->l_phdr[i]; - if (ph->p_type == PT_DYNAMIC) - { - l->l_ld = (void *) ph->p_vaddr; - l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn)); - } - else if (ph->p_type == PT_LOAD) - { - if (! l->l_addr) - l->l_addr = ph->p_vaddr; - if (ph->p_vaddr + ph->p_memsz >= l->l_map_end) - l->l_map_end = ph->p_vaddr + ph->p_memsz; - if ((ph->p_flags & PF_X) - && ph->p_vaddr + ph->p_memsz >= l->l_text_end) - l->l_text_end = ph->p_vaddr + ph->p_memsz; - } - else - /* There must be no TLS segment. */ - assert (ph->p_type != PT_TLS); - } - l->l_map_start = (ElfW(Addr)) GLRO(dl_sysinfo_dso); - l->l_addr = l->l_map_start - l->l_addr; - l->l_map_end += l->l_addr; - l->l_text_end += l->l_addr; - l->l_ld = (void *) ((ElfW(Addr)) l->l_ld + l->l_addr); - elf_get_dynamic_info (l, dyn_temp); - _dl_setup_hash (l); - l->l_relocated = 1; - - /* The vDSO is always used. */ - l->l_used = 1; - - /* Initialize l_local_scope to contain just this map. This allows - the use of dl_lookup_symbol_x to resolve symbols within the vdso. - So we create a single entry list pointing to l_real as its only - element */ - l->l_local_scope[0]->r_nlist = 1; - l->l_local_scope[0]->r_list = &l->l_real; - - /* Now that we have the info handy, use the DSO image's soname - so this object can be looked up by name. Note that we do not - set l_name here. That field gives the file name of the DSO, - and this DSO is not associated with any file. */ - if (l->l_info[DT_SONAME] != NULL) - { - /* Work around a kernel problem. The kernel cannot handle - addresses in the vsyscall DSO pages in writev() calls. */ - const char *dsoname = ((char *) D_PTR (l, l_info[DT_STRTAB]) - + l->l_info[DT_SONAME]->d_un.d_val); - size_t len = strlen (dsoname) + 1; - char *copy = malloc (len); - if (copy == NULL) - _dl_fatal_printf ("out of memory\n"); - l->l_libname->name = l->l_name = memcpy (copy, dsoname, len); - } - - /* Add the vDSO to the object list. */ - _dl_add_to_namespace_list (l, LM_ID_BASE); - -# if IS_IN (rtld) - /* Rearrange the list so this DSO appears after rtld_map. */ - assert (l->l_next == NULL); - assert (l->l_prev == main_map); - GL(dl_rtld_map).l_next = l; - l->l_prev = &GL(dl_rtld_map); - *first_preload = &l->l_next; -# else - GL(dl_nns) = 1; -# endif - - /* We have a prelinked DSO preloaded by the system. */ - GLRO(dl_sysinfo_map) = l; -# ifdef NEED_DL_SYSINFO - if (GLRO(dl_sysinfo) == DL_SYSINFO_DEFAULT) - GLRO(dl_sysinfo) = GLRO(dl_sysinfo_dso)->e_entry + l->l_addr; -# endif - } -#endif -} |