| # This shell script emits a C file. -*- C -*- |
| # It does some substitutions. |
| # This file is now misnamed, because it supports both 32 bit and 64 bit |
| # ELF emulations. |
| test -z "${ELFSIZE}" && ELFSIZE=32 |
| cat >e${EMULATION_NAME}.c <<EOF |
| /* This file is is generated by a shell script. DO NOT EDIT! */ |
| |
| /* ${ELFSIZE} bit ELF emulation code for ${EMULATION_NAME} |
| Copyright (C) 1991, 93, 94, 95, 96, 97, 1998 Free Software Foundation, Inc. |
| Written by Steve Chamberlain <sac@cygnus.com> |
| ELF support by Ian Lance Taylor <ian@cygnus.com> |
| |
| This file is part of GLD, the Gnu Linker. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #define TARGET_IS_${EMULATION_NAME} |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| |
| #include <ctype.h> |
| |
| #include "bfdlink.h" |
| |
| #include "ld.h" |
| #include "ldmain.h" |
| #include "ldemul.h" |
| #include "ldfile.h" |
| #include "ldmisc.h" |
| #include "ldexp.h" |
| #include "ldlang.h" |
| #include "ldgram.h" |
| |
| static void gld${EMULATION_NAME}_before_parse PARAMS ((void)); |
| static boolean gld${EMULATION_NAME}_open_dynamic_archive |
| PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *)); |
| static void gld${EMULATION_NAME}_after_open PARAMS ((void)); |
| static void gld${EMULATION_NAME}_check_needed |
| PARAMS ((lang_input_statement_type *)); |
| static void gld${EMULATION_NAME}_stat_needed |
| PARAMS ((lang_input_statement_type *)); |
| static boolean gld${EMULATION_NAME}_search_needed |
| PARAMS ((const char *, const char *, int)); |
| static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *, int)); |
| static void gld${EMULATION_NAME}_vercheck |
| PARAMS ((lang_input_statement_type *)); |
| static void gld${EMULATION_NAME}_before_allocation PARAMS ((void)); |
| static void gld${EMULATION_NAME}_find_statement_assignment |
| PARAMS ((lang_statement_union_type *)); |
| static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *)); |
| static boolean gld${EMULATION_NAME}_place_orphan |
| PARAMS ((lang_input_statement_type *, asection *)); |
| static void gld${EMULATION_NAME}_place_section |
| PARAMS ((lang_statement_union_type *)); |
| static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile)); |
| |
| static void |
| gld${EMULATION_NAME}_before_parse() |
| { |
| ldfile_output_architecture = bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`; |
| config.dynamic_link = ${DYNAMIC_LINK-true}; |
| config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`; |
| } |
| |
| /* Try to open a dynamic archive. This is where we know that ELF |
| dynamic libraries have an extension of .so. */ |
| |
| static boolean |
| gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry) |
| const char *arch; |
| search_dirs_type *search; |
| lang_input_statement_type *entry; |
| { |
| const char *filename; |
| char *string; |
| |
| if (! entry->is_archive) |
| return false; |
| |
| filename = entry->filename; |
| |
| string = (char *) xmalloc (strlen (search->name) |
| + strlen (filename) |
| + strlen (arch) |
| + sizeof "/lib.so"); |
| |
| sprintf (string, "%s/lib%s%s.so", search->name, filename, arch); |
| |
| if (! ldfile_try_open_bfd (string, entry)) |
| { |
| free (string); |
| return false; |
| } |
| |
| entry->filename = string; |
| |
| /* We have found a dynamic object to include in the link. The ELF |
| backend linker will create a DT_NEEDED entry in the .dynamic |
| section naming this file. If this file includes a DT_SONAME |
| entry, it will be used. Otherwise, the ELF linker will just use |
| the name of the file. For an archive found by searching, like |
| this one, the DT_NEEDED entry should consist of just the name of |
| the file, without the path information used to find it. Note |
| that we only need to do this if we have a dynamic object; an |
| archive will never be referenced by a DT_NEEDED entry. |
| |
| FIXME: This approach--using bfd_elf_set_dt_needed_name--is not |
| very pretty. I haven't been able to think of anything that is |
| pretty, though. */ |
| if (bfd_check_format (entry->the_bfd, bfd_object) |
| && (entry->the_bfd->flags & DYNAMIC) != 0) |
| { |
| char *needed_name; |
| |
| ASSERT (entry->is_archive && entry->search_dirs_flag); |
| needed_name = (char *) xmalloc (strlen (filename) |
| + strlen (arch) |
| + sizeof "lib.so"); |
| sprintf (needed_name, "lib%s%s.so", filename, arch); |
| bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name); |
| } |
| |
| return true; |
| } |
| |
| EOF |
| if [ "x${host}" = "x${target}" ] ; then |
| case " ${EMULATION_LIBPATH} " in |
| *" ${EMULATION_NAME} "*) |
| cat >>e${EMULATION_NAME}.c <<EOF |
| |
| /* For a native linker, check the file /etc/ld.so.conf for directories |
| in which we may find shared libraries. /etc/ld.so.conf is really |
| only meaningful on Linux, but we check it on other systems anyhow. */ |
| |
| static boolean gld${EMULATION_NAME}_check_ld_so_conf |
| PARAMS ((const char *, int)); |
| |
| static boolean |
| gld${EMULATION_NAME}_check_ld_so_conf (name, force) |
| const char *name; |
| int force; |
| { |
| static boolean initialized; |
| static char *ld_so_conf; |
| |
| if (! initialized) |
| { |
| FILE *f; |
| |
| f = fopen ("/etc/ld.so.conf", FOPEN_RT); |
| if (f != NULL) |
| { |
| char *b; |
| size_t len, alloc; |
| int c; |
| |
| len = 0; |
| alloc = 100; |
| b = (char *) xmalloc (alloc); |
| |
| while ((c = getc (f)) != EOF) |
| { |
| if (len + 1 >= alloc) |
| { |
| alloc *= 2; |
| b = (char *) xrealloc (b, alloc); |
| } |
| if (c != ':' |
| && c != ' ' |
| && c != '\t' |
| && c != '\n' |
| && c != ',') |
| { |
| b[len] = c; |
| ++len; |
| } |
| else |
| { |
| if (len > 0 && b[len - 1] != ':') |
| { |
| b[len] = ':'; |
| ++len; |
| } |
| } |
| } |
| |
| if (len > 0 && b[len - 1] == ':') |
| --len; |
| |
| if (len > 0) |
| b[len] = '\0'; |
| else |
| { |
| free (b); |
| b = NULL; |
| } |
| |
| fclose (f); |
| |
| ld_so_conf = b; |
| } |
| |
| initialized = true; |
| } |
| |
| if (ld_so_conf == NULL) |
| return false; |
| |
| return gld${EMULATION_NAME}_search_needed (ld_so_conf, name, force); |
| } |
| |
| EOF |
| ;; |
| esac |
| fi |
| cat >>e${EMULATION_NAME}.c <<EOF |
| |
| /* These variables are required to pass information back and forth |
| between after_open and check_needed and stat_needed and vercheck. */ |
| |
| static struct bfd_link_needed_list *global_needed; |
| static struct stat global_stat; |
| static boolean global_found; |
| static struct bfd_link_needed_list *global_vercheck_needed; |
| static boolean global_vercheck_failed; |
| |
| /* This is called after all the input files have been opened. */ |
| |
| static void |
| gld${EMULATION_NAME}_after_open () |
| { |
| struct bfd_link_needed_list *needed, *l; |
| |
| /* We only need to worry about this when doing a final link. */ |
| if (link_info.relocateable || link_info.shared) |
| return; |
| |
| /* Get the list of files which appear in DT_NEEDED entries in |
| dynamic objects included in the link (often there will be none). |
| For each such file, we want to track down the corresponding |
| library, and include the symbol table in the link. This is what |
| the runtime dynamic linker will do. Tracking the files down here |
| permits one dynamic object to include another without requiring |
| special action by the person doing the link. Note that the |
| needed list can actually grow while we are stepping through this |
| loop. */ |
| needed = bfd_elf_get_needed_list (output_bfd, &link_info); |
| for (l = needed; l != NULL; l = l->next) |
| { |
| struct bfd_link_needed_list *ll; |
| int force; |
| |
| /* If we've already seen this file, skip it. */ |
| for (ll = needed; ll != l; ll = ll->next) |
| if (strcmp (ll->name, l->name) == 0) |
| break; |
| if (ll != l) |
| continue; |
| |
| /* See if this file was included in the link explicitly. */ |
| global_needed = l; |
| global_found = false; |
| lang_for_each_input_file (gld${EMULATION_NAME}_check_needed); |
| if (global_found) |
| continue; |
| |
| /* We need to find this file and include the symbol table. We |
| want to search for the file in the same way that the dynamic |
| linker will search. That means that we want to use |
| rpath_link, rpath, then the environment variable |
| LD_LIBRARY_PATH (native only), then the linker script |
| LIB_SEARCH_DIRS. We do not search using the -L arguments. |
| |
| We search twice. The first time, we skip objects which may |
| introduce version mismatches. The second time, we force |
| their use. See gld${EMULATION_NAME}_vercheck comment. */ |
| for (force = 0; force < 2; force++) |
| { |
| const char *lib_path; |
| size_t len; |
| search_dirs_type *search; |
| |
| if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link, |
| l->name, force)) |
| break; |
| if (gld${EMULATION_NAME}_search_needed (command_line.rpath, |
| l->name, force)) |
| break; |
| if (command_line.rpath_link == NULL |
| && command_line.rpath == NULL) |
| { |
| lib_path = (const char *) getenv ("LD_RUN_PATH"); |
| if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, |
| force)) |
| break; |
| } |
| EOF |
| if [ "x${host}" = "x${target}" ] ; then |
| case " ${EMULATION_LIBPATH} " in |
| *" ${EMULATION_NAME} "*) |
| cat >>e${EMULATION_NAME}.c <<EOF |
| lib_path = (const char *) getenv ("LD_LIBRARY_PATH"); |
| if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force)) |
| break; |
| EOF |
| ;; |
| esac |
| fi |
| cat >>e${EMULATION_NAME}.c <<EOF |
| len = strlen (l->name); |
| for (search = search_head; search != NULL; search = search->next) |
| { |
| char *filename; |
| |
| if (search->cmdline) |
| continue; |
| filename = (char *) xmalloc (strlen (search->name) + len + 2); |
| sprintf (filename, "%s/%s", search->name, l->name); |
| if (gld${EMULATION_NAME}_try_needed (filename, force)) |
| break; |
| free (filename); |
| } |
| if (search != NULL) |
| break; |
| EOF |
| if [ "x${host}" = "x${target}" ] ; then |
| case " ${EMULATION_LIBPATH} " in |
| *" ${EMULATION_NAME} "*) |
| cat >>e${EMULATION_NAME}.c <<EOF |
| if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force)) |
| break; |
| EOF |
| ;; |
| esac |
| fi |
| cat >>e${EMULATION_NAME}.c <<EOF |
| } |
| |
| if (force < 2) |
| continue; |
| |
| einfo ("%P: warning: %s, needed by %B, not found (try using --rpath)\n", |
| l->name, l->by); |
| } |
| } |
| |
| /* Search for a needed file in a path. */ |
| |
| static boolean |
| gld${EMULATION_NAME}_search_needed (path, name, force) |
| const char *path; |
| const char *name; |
| int force; |
| { |
| const char *s; |
| size_t len; |
| |
| if (path == NULL || *path == '\0') |
| return false; |
| len = strlen (name); |
| while (1) |
| { |
| char *filename, *sset; |
| |
| s = strchr (path, ':'); |
| if (s == NULL) |
| s = path + strlen (path); |
| |
| filename = (char *) xmalloc (s - path + len + 2); |
| if (s == path) |
| sset = filename; |
| else |
| { |
| memcpy (filename, path, s - path); |
| filename[s - path] = '/'; |
| sset = filename + (s - path) + 1; |
| } |
| strcpy (sset, name); |
| |
| if (gld${EMULATION_NAME}_try_needed (filename, force)) |
| return true; |
| |
| free (filename); |
| |
| if (*s == '\0') |
| break; |
| path = s + 1; |
| } |
| |
| return false; |
| } |
| |
| /* This function is called for each possible name for a dynamic object |
| named by a DT_NEEDED entry. The FORCE parameter indicates whether |
| to skip the check for a conflicting version. */ |
| |
| static boolean |
| gld${EMULATION_NAME}_try_needed (name, force) |
| const char *name; |
| int force; |
| { |
| bfd *abfd; |
| |
| abfd = bfd_openr (name, bfd_get_target (output_bfd)); |
| if (abfd == NULL) |
| return false; |
| if (! bfd_check_format (abfd, bfd_object)) |
| { |
| (void) bfd_close (abfd); |
| return false; |
| } |
| if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0) |
| { |
| (void) bfd_close (abfd); |
| return false; |
| } |
| |
| /* Check whether this object would include any conflicting library |
| versions. If FORCE is set, then we skip this check; we use this |
| the second time around, if we couldn't find any compatible |
| instance of the shared library. */ |
| |
| if (! force) |
| { |
| struct bfd_link_needed_list *needed; |
| |
| if (! bfd_elf_get_bfd_needed_list (abfd, &needed)) |
| einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd); |
| |
| if (needed != NULL) |
| { |
| global_vercheck_needed = needed; |
| global_vercheck_failed = false; |
| lang_for_each_input_file (gld${EMULATION_NAME}_vercheck); |
| if (global_vercheck_failed) |
| { |
| (void) bfd_close (abfd); |
| /* Return false to force the caller to move on to try |
| another file on the search path. */ |
| return false; |
| } |
| |
| /* But wait! It gets much worse. On Linux, if a shared |
| library does not use libc at all, we are supposed to skip |
| it the first time around in case we encounter a shared |
| library later on with the same name which does use the |
| version of libc that we want. This is much too horrible |
| to use on any system other than Linux. */ |
| |
| EOF |
| case ${target} in |
| *-*-linux-gnu*) |
| cat >>e${EMULATION_NAME}.c <<EOF |
| { |
| struct bfd_link_needed_list *l; |
| |
| for (l = needed; l != NULL; l = l->next) |
| if (strncmp (l->name, "libc.so", 7) == 0) |
| break; |
| if (l == NULL) |
| { |
| (void) bfd_close (abfd); |
| return false; |
| } |
| } |
| |
| EOF |
| ;; |
| esac |
| cat >>e${EMULATION_NAME}.c <<EOF |
| } |
| } |
| |
| /* We've found a dynamic object matching the DT_NEEDED entry. */ |
| |
| /* We have already checked that there is no other input file of the |
| same name. We must now check again that we are not including the |
| same file twice. We need to do this because on many systems |
| libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will |
| reference libc.so.1. If we have already included libc.so, we |
| don't want to include libc.so.1 if they are the same file, and we |
| can only check that using stat. */ |
| |
| if (bfd_stat (abfd, &global_stat) != 0) |
| einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd); |
| global_found = false; |
| lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed); |
| if (global_found) |
| { |
| /* Return true to indicate that we found the file, even though |
| we aren't going to do anything with it. */ |
| return true; |
| } |
| |
| /* Tell the ELF backend that don't want the output file to have a |
| DT_NEEDED entry for this file. */ |
| bfd_elf_set_dt_needed_name (abfd, ""); |
| |
| /* Add this file into the symbol table. */ |
| if (! bfd_link_add_symbols (abfd, &link_info)) |
| einfo ("%F%B: could not read symbols: %E\n", abfd); |
| |
| return true; |
| } |
| |
| /* See if an input file matches a DT_NEEDED entry by name. */ |
| |
| static void |
| gld${EMULATION_NAME}_check_needed (s) |
| lang_input_statement_type *s; |
| { |
| if (global_found) |
| return; |
| |
| if (s->filename != NULL |
| && strcmp (s->filename, global_needed->name) == 0) |
| { |
| global_found = true; |
| return; |
| } |
| |
| if (s->the_bfd != NULL) |
| { |
| const char *soname; |
| |
| soname = bfd_elf_get_dt_soname (s->the_bfd); |
| if (soname != NULL |
| && strcmp (soname, global_needed->name) == 0) |
| { |
| global_found = true; |
| return; |
| } |
| } |
| |
| if (s->search_dirs_flag |
| && s->filename != NULL |
| && strchr (global_needed->name, '/') == NULL) |
| { |
| const char *f; |
| |
| f = strrchr (s->filename, '/'); |
| if (f != NULL |
| && strcmp (f + 1, global_needed->name) == 0) |
| { |
| global_found = true; |
| return; |
| } |
| } |
| } |
| |
| /* See if an input file matches a DT_NEEDED entry by running stat on |
| the file. */ |
| |
| static void |
| gld${EMULATION_NAME}_stat_needed (s) |
| lang_input_statement_type *s; |
| { |
| struct stat st; |
| const char *suffix; |
| const char *soname; |
| const char *f; |
| |
| if (global_found) |
| return; |
| if (s->the_bfd == NULL) |
| return; |
| |
| if (bfd_stat (s->the_bfd, &st) != 0) |
| { |
| einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd); |
| return; |
| } |
| |
| if (st.st_dev == global_stat.st_dev |
| && st.st_ino == global_stat.st_ino) |
| { |
| global_found = true; |
| return; |
| } |
| |
| /* We issue a warning if it looks like we are including two |
| different versions of the same shared library. For example, |
| there may be a problem if -lc picks up libc.so.6 but some other |
| shared library has a DT_NEEDED entry of libc.so.5. This is a |
| hueristic test, and it will only work if the name looks like |
| NAME.so.VERSION. FIXME: Depending on file names is error-prone. |
| If we really want to issue warnings about mixing version numbers |
| of shared libraries, we need to find a better way. */ |
| |
| if (strchr (global_needed->name, '/') != NULL) |
| return; |
| suffix = strstr (global_needed->name, ".so."); |
| if (suffix == NULL) |
| return; |
| suffix += sizeof ".so." - 1; |
| |
| soname = bfd_elf_get_dt_soname (s->the_bfd); |
| if (soname == NULL) |
| soname = s->filename; |
| |
| f = strrchr (soname, '/'); |
| if (f != NULL) |
| ++f; |
| else |
| f = soname; |
| |
| if (strncmp (f, global_needed->name, suffix - global_needed->name) == 0) |
| einfo ("%P: warning: %s, needed by %B, may conflict with %s\n", |
| global_needed->name, global_needed->by, f); |
| } |
| |
| /* On Linux, it's possible to have different versions of the same |
| shared library linked against different versions of libc. The |
| dynamic linker somehow tags which libc version to use in |
| /etc/ld.so.cache, and, based on the libc that it sees in the |
| executable, chooses which version of the shared library to use. |
| |
| We try to do a similar check here by checking whether this shared |
| library needs any other shared libraries which may conflict with |
| libraries we have already included in the link. If it does, we |
| skip it, and try to find another shared library farther on down the |
| link path. |
| |
| This is called via lang_for_each_input_file. |
| GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object |
| which we ar checking. This sets GLOBAL_VERCHECK_FAILED if we find |
| a conflicting version. */ |
| |
| static void |
| gld${EMULATION_NAME}_vercheck (s) |
| lang_input_statement_type *s; |
| { |
| const char *soname, *f; |
| struct bfd_link_needed_list *l; |
| |
| if (global_vercheck_failed) |
| return; |
| if (s->the_bfd == NULL |
| || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0) |
| return; |
| |
| soname = bfd_elf_get_dt_soname (s->the_bfd); |
| if (soname == NULL) |
| soname = bfd_get_filename (s->the_bfd); |
| |
| f = strrchr (soname, '/'); |
| if (f != NULL) |
| ++f; |
| else |
| f = soname; |
| |
| for (l = global_vercheck_needed; l != NULL; l = l->next) |
| { |
| const char *suffix; |
| |
| if (strcmp (f, l->name) == 0) |
| { |
| /* Probably can't happen, but it's an easy check. */ |
| continue; |
| } |
| |
| if (strchr (l->name, '/') != NULL) |
| continue; |
| |
| suffix = strstr (l->name, ".so."); |
| if (suffix == NULL) |
| continue; |
| |
| suffix += sizeof ".so." - 1; |
| |
| if (strncmp (f, l->name, suffix - l->name) == 0) |
| { |
| /* Here we know that S is a dynamic object FOO.SO.VER1, and |
| the object we are considering needs a dynamic object |
| FOO.SO.VER2, and VER1 and VER2 are different. This |
| appears to be a version mismatch, so we tell the caller |
| to try a different version of this library. */ |
| global_vercheck_failed = true; |
| return; |
| } |
| } |
| } |
| |
| /* This is called after the sections have been attached to output |
| sections, but before any sizes or addresses have been set. */ |
| |
| static void |
| gld${EMULATION_NAME}_before_allocation () |
| { |
| const char *rpath; |
| asection *sinterp; |
| |
| /* If we are going to make any variable assignments, we need to let |
| the ELF backend know about them in case the variables are |
| referred to by dynamic objects. */ |
| lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment); |
| |
| /* Let the ELF backend work out the sizes of any sections required |
| by dynamic linking. */ |
| rpath = command_line.rpath; |
| if (rpath == NULL) |
| rpath = (const char *) getenv ("LD_RUN_PATH"); |
| if (! (bfd_elf${ELFSIZE}_size_dynamic_sections |
| (output_bfd, command_line.soname, rpath, |
| command_line.export_dynamic, command_line.filter_shlib, |
| (const char * const *) command_line.auxiliary_filters, |
| &link_info, &sinterp, lang_elf_version_info))) |
| einfo ("%P%F: failed to set dynamic section sizes: %E\n"); |
| |
| /* Let the user override the dynamic linker we are using. */ |
| if (command_line.interpreter != NULL |
| && sinterp != NULL) |
| { |
| sinterp->contents = (bfd_byte *) command_line.interpreter; |
| sinterp->_raw_size = strlen (command_line.interpreter) + 1; |
| } |
| |
| /* Look for any sections named .gnu.warning. As a GNU extensions, |
| we treat such sections as containing warning messages. We print |
| out the warning message, and then zero out the section size so |
| that it does not get copied into the output file. */ |
| |
| { |
| LANG_FOR_EACH_INPUT_STATEMENT (is) |
| { |
| asection *s; |
| bfd_size_type sz; |
| char *msg; |
| boolean ret; |
| |
| if (is->just_syms_flag) |
| continue; |
| |
| s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning"); |
| if (s == NULL) |
| continue; |
| |
| sz = bfd_section_size (is->the_bfd, s); |
| msg = xmalloc ((size_t) sz + 1); |
| if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz)) |
| einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n", |
| is->the_bfd); |
| msg[sz] = '\0'; |
| ret = link_info.callbacks->warning (&link_info, msg, |
| (const char *) NULL, |
| is->the_bfd, (asection *) NULL, |
| (bfd_vma) 0); |
| ASSERT (ret); |
| free (msg); |
| |
| /* Clobber the section size, so that we don't waste copying the |
| warning into the output file. */ |
| s->_raw_size = 0; |
| } |
| } |
| } |
| |
| /* This is called by the before_allocation routine via |
| lang_for_each_statement. It locates any assignment statements, and |
| tells the ELF backend about them, in case they are assignments to |
| symbols which are referred to by dynamic objects. */ |
| |
| static void |
| gld${EMULATION_NAME}_find_statement_assignment (s) |
| lang_statement_union_type *s; |
| { |
| if (s->header.type == lang_assignment_statement_enum) |
| gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp); |
| } |
| |
| /* Look through an expression for an assignment statement. */ |
| |
| static void |
| gld${EMULATION_NAME}_find_exp_assignment (exp) |
| etree_type *exp; |
| { |
| struct bfd_link_hash_entry *h; |
| |
| switch (exp->type.node_class) |
| { |
| case etree_provide: |
| h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst, |
| false, false, false); |
| if (h == NULL) |
| break; |
| |
| /* We call record_link_assignment even if the symbol is defined. |
| This is because if it is defined by a dynamic object, we |
| actually want to use the value defined by the linker script, |
| not the value from the dynamic object (because we are setting |
| symbols like etext). If the symbol is defined by a regular |
| object, then, as it happens, calling record_link_assignment |
| will do no harm. */ |
| |
| /* Fall through. */ |
| case etree_assign: |
| if (strcmp (exp->assign.dst, ".") != 0) |
| { |
| if (! (bfd_elf${ELFSIZE}_record_link_assignment |
| (output_bfd, &link_info, exp->assign.dst, |
| exp->type.node_class == etree_provide ? true : false))) |
| einfo ("%P%F: failed to record assignment to %s: %E\n", |
| exp->assign.dst); |
| } |
| gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src); |
| break; |
| |
| case etree_binary: |
| gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs); |
| gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs); |
| break; |
| |
| case etree_trinary: |
| gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond); |
| gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs); |
| gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs); |
| break; |
| |
| case etree_unary: |
| gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| /* Place an orphan section. We use this to put random SHF_ALLOC |
| sections in the right segment. */ |
| |
| static asection *hold_section; |
| static lang_output_section_statement_type *hold_use; |
| static lang_output_section_statement_type *hold_text; |
| static lang_output_section_statement_type *hold_rodata; |
| static lang_output_section_statement_type *hold_data; |
| static lang_output_section_statement_type *hold_bss; |
| static lang_output_section_statement_type *hold_rel; |
| static lang_output_section_statement_type *hold_interp; |
| |
| /*ARGSUSED*/ |
| static boolean |
| gld${EMULATION_NAME}_place_orphan (file, s) |
| lang_input_statement_type *file; |
| asection *s; |
| { |
| lang_output_section_statement_type *place; |
| asection *snew, **pps; |
| lang_statement_list_type *old; |
| lang_statement_list_type add; |
| etree_type *address; |
| const char *secname, *ps; |
| const char *outsecname; |
| lang_output_section_statement_type *os; |
| |
| if ((s->flags & SEC_ALLOC) == 0) |
| return false; |
| |
| /* Look through the script to see where to place this section. */ |
| hold_section = s; |
| hold_use = NULL; |
| lang_for_each_statement (gld${EMULATION_NAME}_place_section); |
| |
| if (hold_use != NULL) |
| { |
| /* We have already placed a section with this name. */ |
| wild_doit (&hold_use->children, s, hold_use, file); |
| return true; |
| } |
| |
| secname = bfd_get_section_name (s->owner, s); |
| |
| /* If this is a final link, then always put .gnu.warning.SYMBOL |
| sections into the .text section to get them out of the way. */ |
| if (! link_info.shared |
| && ! link_info.relocateable |
| && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0 |
| && hold_text != NULL) |
| { |
| wild_doit (&hold_text->children, s, hold_text, file); |
| return true; |
| } |
| |
| /* Decide which segment the section should go in based on the |
| section name and section flags. We put loadable .note sections |
| right after the .interp section, so that the PT_NOTE segment is |
| stored right after the program headers where the OS can read it |
| in the first page. */ |
| place = NULL; |
| if (s->flags & SEC_EXCLUDE) |
| return false; |
| else if ((s->flags & SEC_LOAD) != 0 |
| && strncmp (secname, ".note", 4) == 0 |
| && hold_interp != NULL) |
| place = hold_interp; |
| else if ((s->flags & SEC_HAS_CONTENTS) == 0 |
| && hold_bss != NULL) |
| place = hold_bss; |
| else if ((s->flags & SEC_READONLY) == 0 |
| && hold_data != NULL) |
| place = hold_data; |
| else if (strncmp (secname, ".rel", 4) == 0 |
| && hold_rel != NULL) |
| place = hold_rel; |
| else if ((s->flags & SEC_CODE) == 0 |
| && (s->flags & SEC_READONLY) != 0 |
| && hold_rodata != NULL) |
| place = hold_rodata; |
| else if ((s->flags & SEC_READONLY) != 0 |
| && hold_text != NULL) |
| place = hold_text; |
| if (place == NULL) |
| return false; |
| |
| /* Choose a unique name for the section. This will be needed if the |
| same section name appears in the input file with different |
| loadable or allocateable characteristics. */ |
| outsecname = secname; |
| if (bfd_get_section_by_name (output_bfd, outsecname) != NULL) |
| { |
| unsigned int len; |
| char *newname; |
| unsigned int i; |
| |
| len = strlen (outsecname); |
| newname = xmalloc (len + 5); |
| strcpy (newname, outsecname); |
| i = 0; |
| do |
| { |
| sprintf (newname + len, "%d", i); |
| ++i; |
| } |
| while (bfd_get_section_by_name (output_bfd, newname) != NULL); |
| |
| outsecname = newname; |
| } |
| |
| /* Create the section in the output file, and put it in the right |
| place. This shuffling is to make the output file look neater. */ |
| snew = bfd_make_section (output_bfd, outsecname); |
| if (snew == NULL) |
| einfo ("%P%F: output format %s cannot represent section called %s\n", |
| output_bfd->xvec->name, outsecname); |
| if (place->bfd_section != NULL) |
| { |
| for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next) |
| ; |
| *pps = snew->next; |
| snew->next = place->bfd_section->next; |
| place->bfd_section->next = snew; |
| } |
| |
| /* Start building a list of statements for this section. */ |
| old = stat_ptr; |
| stat_ptr = &add; |
| lang_list_init (stat_ptr); |
| |
| /* If the name of the section is representable in C, then create |
| symbols to mark the start and the end of the section. */ |
| for (ps = outsecname; *ps != '\0'; ps++) |
| if (! isalnum ((unsigned char) *ps) && *ps != '_') |
| break; |
| if (*ps == '\0' && config.build_constructors) |
| { |
| char *symname; |
| |
| symname = (char *) xmalloc (ps - outsecname + sizeof "__start_"); |
| sprintf (symname, "__start_%s", outsecname); |
| lang_add_assignment (exp_assop ('=', symname, |
| exp_unop (ALIGN_K, |
| exp_intop ((bfd_vma) 1 |
| << s->alignment_power)))); |
| } |
| |
| if (! link_info.relocateable) |
| address = NULL; |
| else |
| address = exp_intop ((bfd_vma) 0); |
| |
| lang_enter_output_section_statement (outsecname, address, 0, |
| (bfd_vma) 0, |
| (etree_type *) NULL, |
| (etree_type *) NULL, |
| (etree_type *) NULL); |
| |
| os = lang_output_section_statement_lookup (outsecname); |
| wild_doit (&os->children, s, os, file); |
| |
| lang_leave_output_section_statement |
| ((bfd_vma) 0, "*default*", (struct lang_output_section_phdr_list *) NULL); |
| stat_ptr = &add; |
| |
| if (*ps == '\0' && config.build_constructors) |
| { |
| char *symname; |
| |
| symname = (char *) xmalloc (ps - outsecname + sizeof "__stop_"); |
| sprintf (symname, "__stop_%s", outsecname); |
| lang_add_assignment (exp_assop ('=', symname, |
| exp_nameop (NAME, "."))); |
| } |
| |
| /* Now stick the new statement list right after PLACE. */ |
| *add.tail = place->header.next; |
| place->header.next = add.head; |
| |
| stat_ptr = old; |
| |
| return true; |
| } |
| |
| static void |
| gld${EMULATION_NAME}_place_section (s) |
| lang_statement_union_type *s; |
| { |
| lang_output_section_statement_type *os; |
| |
| if (s->header.type != lang_output_section_statement_enum) |
| return; |
| |
| os = &s->output_section_statement; |
| |
| if (strcmp (os->name, hold_section->name) == 0 |
| && os->bfd_section != NULL |
| && ((hold_section->flags & (SEC_LOAD | SEC_ALLOC)) |
| == (os->bfd_section->flags & (SEC_LOAD | SEC_ALLOC)))) |
| hold_use = os; |
| |
| if (strcmp (os->name, ".text") == 0) |
| hold_text = os; |
| else if (strcmp (os->name, ".rodata") == 0) |
| hold_rodata = os; |
| else if (strcmp (os->name, ".data") == 0) |
| hold_data = os; |
| else if (strcmp (os->name, ".bss") == 0) |
| hold_bss = os; |
| else if (hold_rel == NULL |
| && os->bfd_section != NULL |
| && (os->bfd_section->flags & SEC_ALLOC) != 0 |
| && strncmp (os->name, ".rel", 4) == 0) |
| hold_rel = os; |
| else if (strcmp (os->name, ".interp") == 0) |
| hold_interp = os; |
| } |
| |
| static char * |
| gld${EMULATION_NAME}_get_script(isfile) |
| int *isfile; |
| EOF |
| |
| if test -n "$COMPILE_IN" |
| then |
| # Scripts compiled in. |
| |
| # sed commands to quote an ld script as a C string. |
| sc='s/["\\]/\\&/g |
| s/$/\\n\\/ |
| 1s/^/"/ |
| $s/$/n"/ |
| ' |
| |
| cat >>e${EMULATION_NAME}.c <<EOF |
| { |
| *isfile = 0; |
| |
| if (link_info.relocateable == true && config.build_constructors == true) |
| return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`; |
| else if (link_info.relocateable == true) |
| return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`; |
| else if (!config.text_read_only) |
| return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`; |
| else if (!config.magic_demand_paged) |
| return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`; |
| EOF |
| |
| if test -n "$GENERATE_SHLIB_SCRIPT" ; then |
| cat >>e${EMULATION_NAME}.c <<EOF |
| else if (link_info.shared) |
| return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`; |
| EOF |
| fi |
| |
| cat >>e${EMULATION_NAME}.c <<EOF |
| else |
| return `sed "$sc" ldscripts/${EMULATION_NAME}.x`; |
| } |
| EOF |
| |
| else |
| # Scripts read from the filesystem. |
| |
| cat >>e${EMULATION_NAME}.c <<EOF |
| { |
| *isfile = 1; |
| |
| if (link_info.relocateable == true && config.build_constructors == true) |
| return "ldscripts/${EMULATION_NAME}.xu"; |
| else if (link_info.relocateable == true) |
| return "ldscripts/${EMULATION_NAME}.xr"; |
| else if (!config.text_read_only) |
| return "ldscripts/${EMULATION_NAME}.xbn"; |
| else if (!config.magic_demand_paged) |
| return "ldscripts/${EMULATION_NAME}.xn"; |
| else if (link_info.shared) |
| return "ldscripts/${EMULATION_NAME}.xs"; |
| else |
| return "ldscripts/${EMULATION_NAME}.x"; |
| } |
| EOF |
| |
| fi |
| |
| cat >>e${EMULATION_NAME}.c <<EOF |
| |
| struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = |
| { |
| gld${EMULATION_NAME}_before_parse, |
| syslib_default, |
| hll_default, |
| after_parse_default, |
| gld${EMULATION_NAME}_after_open, |
| after_allocation_default, |
| set_output_arch_default, |
| ldemul_default_target, |
| gld${EMULATION_NAME}_before_allocation, |
| gld${EMULATION_NAME}_get_script, |
| "${EMULATION_NAME}", |
| "${OUTPUT_FORMAT}", |
| NULL, |
| NULL, |
| gld${EMULATION_NAME}_open_dynamic_archive, |
| gld${EMULATION_NAME}_place_orphan |
| }; |
| EOF |