diff options
Diffstat (limited to 'elf/dl-load.h')
| -rw-r--r-- | elf/dl-load.h | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/elf/dl-load.h b/elf/dl-load.h deleted file mode 100644 index 7cd6214d4e..0000000000 --- a/elf/dl-load.h +++ /dev/null @@ -1,135 +0,0 @@ -/* Map in a shared object's segments from the file. - 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/>. */ - -#ifndef _DL_LOAD_H -#define _DL_LOAD_H 1 - -#include <link.h> -#include <sys/mman.h> - - -/* On some systems, no flag bits are given to specify file mapping. */ -#ifndef MAP_FILE -# define MAP_FILE 0 -#endif - -/* The right way to map in the shared library files is MAP_COPY, which - makes a virtual copy of the data at the time of the mmap call; this - guarantees the mapped pages will be consistent even if the file is - overwritten. Some losing VM systems like Linux's lack MAP_COPY. All we - get is MAP_PRIVATE, which copies each page when it is modified; this - means if the file is overwritten, we may at some point get some pages - from the new version after starting with pages from the old version. - - To make up for the lack and avoid the overwriting problem, - what Linux does have is MAP_DENYWRITE. This prevents anyone - from modifying the file while we have it mapped. */ -#ifndef MAP_COPY -# ifdef MAP_DENYWRITE -# define MAP_COPY (MAP_PRIVATE | MAP_DENYWRITE) -# else -# define MAP_COPY MAP_PRIVATE -# endif -#endif - -/* Some systems link their relocatable objects for another base address - than 0. We want to know the base address for these such that we can - subtract this address from the segment addresses during mapping. - This results in a more efficient address space usage. Defaults to - zero for almost all systems. */ -#ifndef MAP_BASE_ADDR -# define MAP_BASE_ADDR(l) 0 -#endif - - -/* Handle situations where we have a preferred location in memory for - the shared objects. */ -#ifdef ELF_PREFERRED_ADDRESS_DATA -ELF_PREFERRED_ADDRESS_DATA; -#endif -#ifndef ELF_PREFERRED_ADDRESS -# define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) (mapstartpref) -#endif -#ifndef ELF_FIXED_ADDRESS -# define ELF_FIXED_ADDRESS(loader, mapstart) ((void) 0) -#endif - - -/* This structure describes one PT_LOAD command. - Its details have been expanded out and converted. */ -struct loadcmd -{ - ElfW(Addr) mapstart, mapend, dataend, allocend; - ElfW(Off) mapoff; - int prot; /* PROT_* bits. */ -}; - - -/* This is a subroutine of _dl_map_segments. It should be called for each - load command, some time after L->l_addr has been set correctly. It is - responsible for setting up the l_text_end and l_phdr fields. */ -static void __always_inline -_dl_postprocess_loadcmd (struct link_map *l, const ElfW(Ehdr) *header, - const struct loadcmd *c) -{ - if (c->prot & PROT_EXEC) - l->l_text_end = l->l_addr + c->mapend; - - if (l->l_phdr == 0 - && c->mapoff <= header->e_phoff - && ((size_t) (c->mapend - c->mapstart + c->mapoff) - >= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr)))) - /* Found the program header in this segment. */ - l->l_phdr = (void *) (uintptr_t) (c->mapstart + header->e_phoff - - c->mapoff); -} - - -/* This is a subroutine of _dl_map_object_from_fd. It is responsible - for filling in several fields in *L: l_map_start, l_map_end, l_addr, - l_contiguous, l_text_end, l_phdr. On successful return, all the - segments are mapped (or copied, or whatever) from the file into their - final places in the address space, with the correct page permissions, - and any bss-like regions already zeroed. It returns a null pointer - on success, or an error message string (to be translated) on error - (having also set errno). - - The file <dl-map-segments.h> defines this function. The canonical - implementation in elf/dl-map-segments.h might be replaced by a sysdeps - version. */ -static const char *_dl_map_segments (struct link_map *l, int fd, - const ElfW(Ehdr) *header, int type, - const struct loadcmd loadcmds[], - size_t nloadcmds, - const size_t maplength, - bool has_holes, - struct link_map *loader); - -/* All the error message strings _dl_map_segments might return are - listed here so that different implementations in different sysdeps - dl-map-segments.h files all use consistent strings that are - guaranteed to have translations. */ -#define DL_MAP_SEGMENTS_ERROR_MAP_SEGMENT \ - N_("failed to map segment from shared object") -#define DL_MAP_SEGMENTS_ERROR_MPROTECT \ - N_("cannot change memory protections") -#define DL_MAP_SEGMENTS_ERROR_MAP_ZERO_FILL \ - N_("cannot map zero-fill pages") - - -#endif /* dl-load.h */ |