# 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 "${ELFSIZE}" && ELFSIZE=32 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH} else OUTPUT_ARCH=${ARCH}:${MACHINE} fi cat >e${EMULATION_NAME}.c < ELF support by Ian Lance Taylor 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_${EMULATION_NAME} #include "bfd.h" #include "sysdep.h" #include "libiberty.h" #include "safe-ctype.h" #include "getopt.h" #include "bfdlink.h" #include "ld.h" #include "ldmain.h" #include "ldmisc.h" #include "ldexp.h" #include "ldlang.h" #include "ldfile.h" #include "ldemul.h" #include #include "elf/common.h" /* Declare functions used by various EXTRA_EM_FILEs. */ static void gld${EMULATION_NAME}_before_parse (void); static void gld${EMULATION_NAME}_after_open (void); static void gld${EMULATION_NAME}_before_allocation (void); static bfd_boolean gld${EMULATION_NAME}_place_orphan (lang_input_statement_type *file, asection *s); static void gld${EMULATION_NAME}_finish (void); EOF # Import any needed special functions and/or overrides. # if test -n "$EXTRA_EM_FILE" ; then . ${srcdir}/emultempl/${EXTRA_EM_FILE}.em fi # Functions in this file can be overridden by setting the LDEMUL_* shell # variables. If the name of the overriding function is the same as is # defined in this file, then don't output this file's version. # If a different overriding name is given then output the standard function # as presumably it is called from the overriding function. # if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then cat >>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <as_needed) class = DYN_AS_NEEDED; /* Tell the ELF linker that we don't want the output file to have a DT_NEEDED entry for any dynamic library in DT_NEEDED tags from this file at all. */ if (!entry->add_needed) class |= DYN_NO_ADD_NEEDED; if (!class || (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) == 0) return FALSE; bfd_elf_set_dyn_lib_class (entry->the_bfd, class); /* Continue on with normal load_symbols processing. */ return FALSE; } EOF fi cat >>e${EMULATION_NAME}.c <the_bfd == NULL || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0) return; soname = bfd_elf_get_dt_soname (s->the_bfd); if (soname == NULL) soname = lbasename (bfd_get_filename (s->the_bfd)); for (l = global_vercheck_needed; l != NULL; l = l->next) { const char *suffix; if (strcmp (soname, l->name) == 0) { /* Probably can't happen, but it's an easy check. */ continue; } if (strchr (l->name, '/') != NULL) continue; suffix = strstr (l->name, ".so."); if (suffix == NULL) continue; suffix += sizeof ".so." - 1; if (strncmp (soname, l->name, suffix - l->name) == 0) { /* Here we know that S is a dynamic object FOO.SO.VER1, and the object we are considering needs a dynamic object FOO.SO.VER2, and VER1 and VER2 are different. This appears to be a version mismatch, so we tell the caller to try a different version of this library. */ global_vercheck_failed = TRUE; return; } } } /* See if an input file matches a DT_NEEDED entry by running stat on the file. */ static void gld${EMULATION_NAME}_stat_needed (lang_input_statement_type *s) { struct stat st; const char *suffix; const char *soname; 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 heuristic 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 = lbasename (s->filename); if (strncmp (soname, 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, soname); } struct dt_needed { bfd *by; const char *name; }; /* 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 bfd_boolean gld${EMULATION_NAME}_try_needed (struct dt_needed *needed, int force) { bfd *abfd; const char *name = needed->name; const char *soname; int class; abfd = bfd_openr (name, bfd_get_target (output_bfd)); if (abfd == NULL) return FALSE; if (! bfd_check_format (abfd, bfd_object)) { bfd_close (abfd); return FALSE; } if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0) { bfd_close (abfd); return FALSE; } /* For DT_NEEDED, they have to match. */ if (abfd->xvec != output_bfd->xvec) { bfd_close (abfd); return FALSE; } /* Check whether this object would include any conflicting library versions. If FORCE is set, then we skip this check; we use this the second time around, if we couldn't find any compatible instance of the shared library. */ if (! force) { struct bfd_link_needed_list *needed; if (! bfd_elf_get_bfd_needed_list (abfd, &needed)) einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd); if (needed != NULL) { global_vercheck_needed = needed; global_vercheck_failed = FALSE; lang_for_each_input_file (gld${EMULATION_NAME}_vercheck); if (global_vercheck_failed) { 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 <next) if (strncmp (l->name, "libc.so", 7) == 0) break; if (l == NULL) { bfd_close (abfd); return FALSE; } } EOF ;; esac cat >>e${EMULATION_NAME}.c <filename); if (trace_file_tries) info_msg (_("found %s at %s\n"), soname, name); global_found = FALSE; lang_for_each_input_file (gld${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; } /* Specify the soname to use. */ bfd_elf_set_dt_needed_name (abfd, soname); /* Tell the ELF linker that we don't want the output file to have a DT_NEEDED entry for this file, unless it is used to resolve references in a regular object. */ class = DYN_DT_NEEDED; /* Tell the ELF linker that we don't want the output file to have a DT_NEEDED entry for this file at all if the entry is from a file with DYN_NO_ADD_NEEDED. */ if (needed->by && (bfd_elf_get_dyn_lib_class (needed->by) & DYN_NO_ADD_NEEDED) != 0) class |= DYN_NO_NEEDED | DYN_NO_ADD_NEEDED; bfd_elf_set_dyn_lib_class (abfd, class); /* 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; } /* Search for a needed file in a path. */ static bfd_boolean gld${EMULATION_NAME}_search_needed (const char *path, struct dt_needed *n, int force) { const char *s; const char *name = n->name; size_t len; struct dt_needed needed; if (name[0] == '/') return gld${EMULATION_NAME}_try_needed (n, force); if (path == NULL || *path == '\0') return FALSE; needed.by = n->by; needed.name = n->name; 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); needed.name = filename; if (gld${EMULATION_NAME}_try_needed (&needed, force)) return TRUE; free (filename); if (*s == '\0') break; path = s + 1; } return FALSE; } EOF if [ "x${USE_LIBPATH}" = xyes ] ; then cat >>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <= 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); if (b) { char *d = gld${EMULATION_NAME}_add_sysroot (b); free (b); b = d; } ld_so_conf = b; } initialized = TRUE; } if (ld_so_conf == NULL) return FALSE; needed.by = NULL; needed.name = name; return gld${EMULATION_NAME}_search_needed (ld_so_conf, &needed, force); } EOF # Linux ;; esac fi cat >>e${EMULATION_NAME}.c <filename != NULL) { const char *f; if (strcmp (s->filename, global_needed->name) == 0) { global_found = TRUE; return; } if (s->search_dirs_flag) { f = strrchr (s->filename, '/'); if (f != NULL && strcmp (f + 1, global_needed->name) == 0) { global_found = TRUE; return; } } } if (s->the_bfd != NULL) { const char *soname; soname = bfd_elf_get_dt_soname (s->the_bfd); if (soname != NULL && strcmp (soname, global_needed->name) == 0) { global_found = TRUE; return; } } } EOF if test x"$LDEMUL_AFTER_OPEN" != xgld"$EMULATION_NAME"_after_open; then cat >>e${EMULATION_NAME}.c <next) { struct bfd_link_needed_list *ll; struct dt_needed n, nn; 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${EMULATION_NAME}_check_needed); if (global_found) continue; n.by = l->by; n.name = l->name; nn.by = l->by; if (trace_file_tries) info_msg (_("%s needed by %B\n"), l->name, l->by); /* We need to find this file and include the symbol table. We want to search for the file in the same way that the dynamic linker will search. That means that we want to use rpath_link, rpath, then the environment variable LD_LIBRARY_PATH (native only), then the DT_RPATH/DT_RUNPATH entries (native only), then the linker script LIB_SEARCH_DIRS. We do not search using the -L arguments. We search twice. The first time, we skip objects which may introduce version mismatches. The second time, we force their use. See gld${EMULATION_NAME}_vercheck comment. */ for (force = 0; force < 2; force++) { size_t len; search_dirs_type *search; EOF if [ "x${USE_LIBPATH}" = xyes ] ; then cat >>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <next) { char *tmpname = gld${EMULATION_NAME}_add_sysroot (rp->name); found = (rp->by == l->by && gld${EMULATION_NAME}_search_needed (tmpname, &n, force)); free (tmpname); } if (found) break; EOF fi cat >>e${EMULATION_NAME}.c <name); for (search = search_head; search != NULL; search = search->next) { char *filename; if (search->cmdline) continue; filename = (char *) xmalloc (strlen (search->name) + len + 2); sprintf (filename, "%s/%s", search->name, l->name); nn.name = filename; if (gld${EMULATION_NAME}_try_needed (&nn, force)) break; free (filename); } if (search != NULL) break; EOF if [ "x${USE_LIBPATH}" = xyes ] ; then case ${target} in *-*-linux-gnu*) cat >>e${EMULATION_NAME}.c <name, force)) break; EOF # Linux ;; esac fi cat >>e${EMULATION_NAME}.c <name, l->by); } } EOF fi cat >>e${EMULATION_NAME}.c <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_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${EMULATION_NAME}_find_exp_assignment (exp->unary.child); break; default: break; } } /* This is called by the before_allocation routine via lang_for_each_statement. It locates any assignment statements, and tells the ELF backend about them, in case they are assignments to symbols which are referred to by dynamic objects. */ static void gld${EMULATION_NAME}_find_statement_assignment (lang_statement_union_type *s) { if (s->header.type == lang_assignment_statement_enum) gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp); } EOF if test x"$LDEMUL_BEFORE_ALLOCATION" != xgld"$EMULATION_NAME"_before_allocation; then if test x"${ELF_INTERPRETER_NAME+set}" = xset; then ELF_INTERPRETER_SET_DEFAULT=" if (sinterp != NULL) { sinterp->contents = ${ELF_INTERPRETER_NAME}; sinterp->size = strlen (sinterp->contents) + 1; } " else ELF_INTERPRETER_SET_DEFAULT= fi cat >>e${EMULATION_NAME}.c <type == bfd_link_elf_hash_table) _bfd_elf_tls_setup (output_bfd, &link_info); /* 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_size_dynamic_sections (output_bfd, command_line.soname, rpath, 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"); ${ELF_INTERPRETER_SET_DEFAULT} /* Let the user override the dynamic linker we are using. */ if (command_line.interpreter != NULL && sinterp != NULL) { sinterp->contents = (bfd_byte *) command_line.interpreter; sinterp->size = strlen (command_line.interpreter) + 1; } /* Look for any sections named .gnu.warning. As a GNU extensions, we treat such sections as containing warning messages. We print out the warning message, and then zero out the section size so that it does not get copied into the output file. */ { LANG_FOR_EACH_INPUT_STATEMENT (is) { asection *s; bfd_size_type sz; bfd_size_type prefix_len; char *msg; bfd_boolean ret; const char * gnu_warning_prefix = _("warning: "); if (is->just_syms_flag) continue; s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning"); if (s == NULL) continue; sz = s->size; prefix_len = strlen (gnu_warning_prefix); msg = xmalloc ((size_t) (prefix_len + sz + 1)); strcpy (msg, gnu_warning_prefix); if (! bfd_get_section_contents (is->the_bfd, s, msg + prefix_len, (file_ptr) 0, sz)) einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n", is->the_bfd); msg[prefix_len + sz] = '\0'; ret = link_info.callbacks->warning (&link_info, msg, (const char *) NULL, is->the_bfd, (asection *) NULL, (bfd_vma) 0); ASSERT (ret); free (msg); /* Clobber the section size, so that we don't waste copying the warning into the output file. */ s->size = 0; } } } EOF fi if test x"$LDEMUL_OPEN_DYNAMIC_ARCHIVE" != xgld"$EMULATION_NAME"_open_dynamic_archive; then cat >>e${EMULATION_NAME}.c <is_archive) return FALSE; filename = entry->filename; /* This allocates a few bytes too many when EXTRA_SHLIB_EXTENSION is defined, but it does not seem worth the headache to optimize away those two bytes of space. */ string = (char *) xmalloc (strlen (search->name) + strlen (filename) + strlen (arch) #ifdef EXTRA_SHLIB_EXTENSION + strlen (EXTRA_SHLIB_EXTENSION) #endif + sizeof "/lib.so"); sprintf (string, "%s/lib%s%s.so", search->name, filename, arch); #ifdef EXTRA_SHLIB_EXTENSION /* Try the .so extension first. If that fails build a new filename using EXTRA_SHLIB_EXTENSION. */ if (! ldfile_try_open_bfd (string, entry)) sprintf (string, "%s/lib%s%s%s", search->name, filename, arch, EXTRA_SHLIB_EXTENSION); #endif 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) { ASSERT (entry->is_archive && entry->search_dirs_flag); /* Rather than duplicating the logic above. Just use the filename we recorded earlier. */ filename = lbasename (entry->filename); bfd_elf_set_dt_needed_name (entry->the_bfd, filename); } return TRUE; } EOF fi if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then cat >>e${EMULATION_NAME}.c <name[4] == 'a'; for (u = lang_output_section_statement.head; u; u = lookup->next) { lookup = &u->output_section_statement; if (lookup->constraint != -1 && strncmp (".rel", lookup->name, 4) == 0) { int lookrela = lookup->name[4] == 'a'; /* .rel.dyn must come before all other reloc sections, to suit GNU ld.so. */ if (isdyn) break; /* Don't place after .rel.plt as doing so results in wrong dynamic tags. */ if (strcmp (".plt", lookup->name + 4 + lookrela) == 0) break; if (rela == lookrela || last_rel == NULL) last_rel = lookup; if ((rela == lookrela || last_rel_alloc == NULL) && lookup->bfd_section != NULL && (lookup->bfd_section->flags & SEC_ALLOC) != 0) last_rel_alloc = lookup; } last = lookup; if (lookup->bfd_section != NULL && (lookup->bfd_section->flags & SEC_ALLOC) != 0) last_alloc = lookup; } if (last_rel_alloc) return last_rel_alloc; if (last_rel) return last_rel; if (last_alloc) return last_alloc; return last; } /* Find the last output section before given output statement. Used by place_orphan. */ static asection * output_prev_sec_find (lang_output_section_statement_type *os) { asection *s = (asection *) NULL; lang_statement_union_type *u; lang_output_section_statement_type *lookup; for (u = lang_output_section_statement.head; u != (lang_statement_union_type *) NULL; u = lookup->next) { lookup = &u->output_section_statement; if (lookup == os) return s; if (lookup->bfd_section != NULL && lookup->bfd_section->owner != NULL) s = lookup->bfd_section; } return NULL; } /* Place an orphan section. We use this to put random SHF_ALLOC sections in the right segment. */ struct orphan_save { lang_output_section_statement_type *os; asection **section; lang_statement_union_type **stmt; lang_statement_union_type **os_tail; }; static bfd_boolean gld${EMULATION_NAME}_place_orphan (lang_input_statement_type *file, asection *s) { static struct orphan_save hold_text; static struct orphan_save hold_rodata; static struct orphan_save hold_data; static struct orphan_save hold_bss; static struct orphan_save hold_rel; static struct orphan_save hold_interp; static struct orphan_save hold_sdata; static int count = 1; struct orphan_save *place; lang_statement_list_type *old; lang_statement_list_type add; etree_type *address; const char *secname; const char *ps = NULL; lang_output_section_statement_type *os; lang_statement_union_type **os_tail; etree_type *load_base; int isdyn = 0; asection *sec; secname = bfd_get_section_name (s->owner, s); if (! link_info.relocatable && link_info.combreloc && (s->flags & SEC_ALLOC) && strncmp (secname, ".rel", 4) == 0) { if (secname[4] == 'a') secname = ".rela.dyn"; else secname = ".rel.dyn"; isdyn = 1; } if (isdyn || (!config.unique_orphan_sections && !unique_section_p (s))) { /* Look through the script to see where to place this section. */ os = lang_output_section_find (secname); if (os != NULL && (os->bfd_section == NULL || ((s->flags ^ os->bfd_section->flags) & (SEC_LOAD | SEC_ALLOC)) == 0)) { /* We already have an output section statement with this name, and its bfd section, if any, has compatible flags. */ lang_add_section (&os->children, s, os, file); return TRUE; } } if (hold_text.os == NULL) hold_text.os = lang_output_section_find (".text"); /* 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.executable && ! link_info.relocatable && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0 && hold_text.os != NULL) { lang_add_section (&hold_text.os->children, s, hold_text.os, 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. */ #define HAVE_SECTION(hold, name) \ (hold.os != NULL || (hold.os = lang_output_section_find (name)) != NULL) place = NULL; if ((s->flags & SEC_ALLOC) == 0) ; else if ((s->flags & SEC_LOAD) != 0 && strncmp (secname, ".note", 5) == 0 && HAVE_SECTION (hold_interp, ".interp")) place = &hold_interp; else if ((s->flags & SEC_HAS_CONTENTS) == 0 && HAVE_SECTION (hold_bss, ".bss")) place = &hold_bss; else if ((s->flags & SEC_SMALL_DATA) != 0 && HAVE_SECTION (hold_sdata, ".sdata")) place = &hold_sdata; else if ((s->flags & SEC_READONLY) == 0 && HAVE_SECTION (hold_data, ".data")) place = &hold_data; else if (strncmp (secname, ".rel", 4) == 0 && (s->flags & SEC_LOAD) != 0 && (hold_rel.os != NULL || (hold_rel.os = output_rel_find (s, isdyn)) != NULL)) place = &hold_rel; else if ((s->flags & (SEC_CODE | SEC_READONLY)) == SEC_READONLY && HAVE_SECTION (hold_rodata, ".rodata")) place = &hold_rodata; else if ((s->flags & (SEC_CODE | SEC_READONLY)) == (SEC_CODE | SEC_READONLY) && hold_text.os != NULL) place = &hold_text; #undef HAVE_SECTION /* 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 allocatable characteristics. But if the section already exists but does not have any flags set, then it has been been created by the linker, probably as a result of a --section-start command line switch. */ if ((sec = bfd_get_section_by_name (output_bfd, secname)) != NULL && bfd_get_section_flags (output_bfd, sec) != 0) { secname = bfd_get_unique_section_name (output_bfd, secname, &count); if (secname == NULL) einfo ("%F%P: place_orphan failed: %E\n"); } /* Start building a list of statements for this section. First save the current statement pointer. */ old = stat_ptr; /* If we have found an appropriate place for the output section statements for this orphan, add them to our own private list, inserting them later into the global statement list. */ if (place != NULL) { stat_ptr = &add; lang_list_init (stat_ptr); } if (config.build_constructors) { /* 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 = secname; *ps != '\0'; ps++) if (! ISALNUM (*ps) && *ps != '_') break; if (*ps == '\0') { char *symname; etree_type *e_align; symname = (char *) xmalloc (ps - secname + sizeof "__start_"); sprintf (symname, "__start_%s", secname); e_align = exp_unop (ALIGN_K, exp_intop ((bfd_vma) 1 << s->alignment_power)); lang_add_assignment (exp_assop ('=', symname, e_align)); } } address = NULL; if (link_info.relocatable || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0) address = exp_intop ((bfd_vma) 0); load_base = NULL; if (place != NULL && place->os->load_base != NULL) { etree_type *lma_from_vma; lma_from_vma = exp_binop ('-', place->os->load_base, exp_nameop (ADDR, place->os->name)); load_base = exp_binop ('+', lma_from_vma, exp_nameop (ADDR, secname)); } os_tail = lang_output_section_statement.tail; os = lang_enter_output_section_statement (secname, address, 0, (etree_type *) NULL, (etree_type *) NULL, load_base, 0); lang_add_section (&os->children, s, os, file); lang_leave_output_section_statement ((bfd_vma) 0, "*default*", (struct lang_output_section_phdr_list *) NULL, NULL); if (config.build_constructors && *ps == '\0') { char *symname; /* lang_leave_ouput_section_statement resets stat_ptr. Put stat_ptr back where we want it. */ if (place != NULL) stat_ptr = &add; symname = (char *) xmalloc (ps - secname + sizeof "__stop_"); sprintf (symname, "__stop_%s", secname); lang_add_assignment (exp_assop ('=', symname, exp_nameop (NAME, "."))); } /* Restore the global list pointer. */ stat_ptr = old; if (place != NULL && os->bfd_section != NULL) { asection *snew, **pps; snew = os->bfd_section; /* Shuffle the bfd section list to make the output file look neater. This is really only cosmetic. */ if (place->section == NULL) { asection *bfd_section = place->os->bfd_section; /* If the output statement hasn't been used to place any input sections (and thus doesn't have an output bfd_section), look for the closest prior output statement having an output section. */ if (bfd_section == NULL) bfd_section = output_prev_sec_find (place->os); if (bfd_section != NULL && bfd_section != snew) place->section = &bfd_section->next; } if (place->section != NULL) { /* Unlink the section. */ for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next) ; bfd_section_list_remove (output_bfd, pps); /* Now tack it on to the "place->os" section list. */ bfd_section_list_insert (output_bfd, place->section, snew); } /* Save the end of this list. Further ophans of this type will follow the one we've just added. */ place->section = &snew->next; /* The following is non-cosmetic. We try to put the output statements in some sort of reasonable order here, because they determine the final load addresses of the orphan sections. In addition, placing output statements in the wrong order may require extra segments. For instance, given a typical situation of all read-only sections placed in one segment and following that a segment containing all the read-write sections, we wouldn't want to place an orphan read/write section before or amongst the read-only ones. */ if (add.head != NULL) { lang_statement_union_type *newly_added_os; if (place->stmt == NULL) { /* Put the new statement list right at the head. */ *add.tail = place->os->header.next; place->os->header.next = add.head; place->os_tail = &place->os->next; } else { /* Put it after the last orphan statement we added. */ *add.tail = *place->stmt; *place->stmt = add.head; } /* Fix the global list pointer if we happened to tack our new list at the tail. */ if (*old->tail == add.head) old->tail = add.tail; /* Save the end of this list. */ place->stmt = add.tail; /* Do the same for the list of output section statements. */ newly_added_os = *os_tail; *os_tail = NULL; newly_added_os->output_section_statement.next = *place->os_tail; *place->os_tail = newly_added_os; place->os_tail = &newly_added_os->output_section_statement.next; /* Fixing the global list pointer here is a little different. We added to the list in lang_enter_output_section_statement, trimmed off the new output_section_statment above when assigning *os_tail = NULL, but possibly added it back in the same place when assigning *place->os_tail. */ if (*os_tail == NULL) lang_output_section_statement.tail = os_tail; } } return TRUE; } EOF fi if test x"$LDEMUL_FINISH" != xgld"$EMULATION_NAME"_finish; then cat >>e${EMULATION_NAME}.c <head, abs_output_section, &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE); /* Redo special stuff. */ ldemul_after_allocation (); /* Do the assignments again. */ lang_do_assignments (stat_ptr->head, abs_output_section, (fill_type *) 0, (bfd_vma) 0); } } EOF fi if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then cat >>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <> e${EMULATION_NAME}.c echo ' ; else if (link_info.relocatable) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c if cmp -s ldscripts/${EMULATION_NAME}.x ldscripts/${EMULATION_NAME}.xn; then : ; else echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c fi if test -n "$GENERATE_PIE_SCRIPT" ; then if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then echo ' ; else if (link_info.pie && link_info.combreloc' >> e${EMULATION_NAME}.c echo ' && link_info.relro' >> e${EMULATION_NAME}.c echo ' && (link_info.flags & DT_BIND_NOW)) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xdw >> e${EMULATION_NAME}.c echo ' ; else if (link_info.pie && link_info.combreloc) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xdc >> e${EMULATION_NAME}.c fi echo ' ; else if (link_info.pie) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xd >> e${EMULATION_NAME}.c fi if test -n "$GENERATE_SHLIB_SCRIPT" ; then if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then echo ' ; else if (link_info.shared && link_info.combreloc' >> e${EMULATION_NAME}.c echo ' && link_info.relro' >> e${EMULATION_NAME}.c echo ' && (link_info.flags & DT_BIND_NOW)) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xsw >> e${EMULATION_NAME}.c echo ' ; else if (link_info.shared && link_info.combreloc) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xsc >> e${EMULATION_NAME}.c fi echo ' ; else if (link_info.shared) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xs >> e${EMULATION_NAME}.c fi if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then echo ' ; else if (link_info.combreloc && link_info.relro' >> e${EMULATION_NAME}.c echo ' && (link_info.flags & DT_BIND_NOW)) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xw >> e${EMULATION_NAME}.c echo ' ; else if (link_info.combreloc) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xc >> e${EMULATION_NAME}.c fi echo ' ; else return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c echo '; }' >> e${EMULATION_NAME}.c else # Scripts read from the filesystem. cat >>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <