# This shell script emits a C file. -*- C -*-
-# Copyright 2002 Free Software Foundation, Inc.
+# Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+# Free Software Foundation, Inc.
#
-# This file is part of GLD, the Gnu Linker.
+# This file is part of the GNU Binutils.
#
# 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
+# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
#
# 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.
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
#
# This file is sourced from elf32.em, and defines extra powerpc64-elf
# specific routines.
#
-cat >>e${EMULATION_NAME}.c <<EOF
+fragment <<EOF
+#include "ldctor.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
#include "elf64-ppc.h"
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+static int stub_added = 0;
+
+/* Whether we need to call ppc_layout_sections_again. */
static int need_laying_out = 0;
-static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
-static void gld${EMULATION_NAME}_finish PARAMS ((void));
+/* Maximum size of a group of input sections that can be handled by
+ one stub section. A value of +/-1 indicates the bfd back-end
+ should use a suitable default size. */
+static bfd_signed_vma group_size = 1;
+
+/* Whether to add ".foo" entries for each "foo" in a version script. */
+static int dotsyms = 1;
+
+/* Whether to run tls optimization. */
+static int no_tls_opt = 0;
+static int no_tls_get_addr_opt = 0;
+
+/* Whether to run opd optimization. */
+static int no_opd_opt = 0;
+
+/* Whether to run toc optimization. */
+static int no_toc_opt = 0;
+
+/* Whether to allow multiple toc sections. */
+static int no_multi_toc = 0;
+
+/* Whether to emit symbols for stubs. */
+static int emit_stub_syms = -1;
+
+static asection *toc_section = 0;
+
+/* Whether to canonicalize .opd so that there are no overlapping
+ .opd entries. */
+static int non_overlapping_opd = 0;
+
+/* This is called before the input files are opened. We create a new
+ fake input file to hold the stub sections. */
+
+static void
+ppc_create_output_section_statements (void)
+{
+ if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
+ && elf_object_id (link_info.output_bfd) == PPC64_ELF_TDATA))
+ return;
+
+ link_info.wrap_char = '.';
+
+ stub_file = lang_add_input_file ("linker stubs",
+ lang_input_file_is_fake_enum,
+ NULL);
+ stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
+ if (stub_file->the_bfd == NULL
+ || !bfd_set_arch_mach (stub_file->the_bfd,
+ bfd_get_arch (link_info.output_bfd),
+ bfd_get_mach (link_info.output_bfd)))
+ {
+ einfo ("%F%P: can not create BFD %E\n");
+ return;
+ }
+
+ stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
+ ldlang_add_file (stub_file);
+ ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info);
+}
+
+static void
+ppc_before_allocation (void)
+{
+ if (stub_file != NULL)
+ {
+ if (!no_opd_opt
+ && !ppc64_elf_edit_opd (link_info.output_bfd, &link_info,
+ non_overlapping_opd))
+ einfo ("%X%P: can not edit %s %E\n", "opd");
+
+ if (ppc64_elf_tls_setup (link_info.output_bfd, &link_info,
+ no_tls_get_addr_opt)
+ && !no_tls_opt)
+ {
+ /* Size the sections. This is premature, but we want to know the
+ TLS segment layout so that certain optimizations can be done. */
+ expld.phase = lang_mark_phase_enum;
+ expld.dataseg.phase = exp_dataseg_none;
+ one_lang_size_sections_pass (NULL, TRUE);
+
+ if (!ppc64_elf_tls_optimize (link_info.output_bfd, &link_info))
+ einfo ("%X%P: TLS problem %E\n");
+
+ /* We must not cache anything from the preliminary sizing. */
+ lang_reset_memory_regions ();
+ }
+
+ if (!no_toc_opt
+ && !link_info.relocatable
+ && !ppc64_elf_edit_toc (link_info.output_bfd, &link_info))
+ einfo ("%X%P: can not edit %s %E\n", "toc");
+ }
+
+ gld${EMULATION_NAME}_before_allocation ();
+}
+
+struct hook_stub_info
+{
+ lang_statement_list_type add;
+ asection *input_section;
+};
+
+/* Traverse the linker tree to find the spot where the stub goes. */
+
+static bfd_boolean
+hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
+{
+ lang_statement_union_type *l;
+ bfd_boolean ret;
+
+ for (; (l = *lp) != NULL; lp = &l->header.next)
+ {
+ switch (l->header.type)
+ {
+ case lang_constructors_statement_enum:
+ ret = hook_in_stub (info, &constructor_list.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_output_section_statement_enum:
+ ret = hook_in_stub (info,
+ &l->output_section_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_wild_statement_enum:
+ ret = hook_in_stub (info, &l->wild_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_group_statement_enum:
+ ret = hook_in_stub (info, &l->group_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_input_section_enum:
+ if (l->input_section.section == info->input_section)
+ {
+ /* We've found our section. Insert the stub immediately
+ before its associated input section. */
+ *lp = info->add.head;
+ *(info->add.tail) = l;
+ return TRUE;
+ }
+ break;
+
+ case lang_data_statement_enum:
+ case lang_reloc_statement_enum:
+ case lang_object_symbols_statement_enum:
+ case lang_output_statement_enum:
+ case lang_target_statement_enum:
+ case lang_input_statement_enum:
+ case lang_assignment_statement_enum:
+ case lang_padding_statement_enum:
+ case lang_address_statement_enum:
+ case lang_fill_statement_enum:
+ break;
+
+ default:
+ FAIL ();
+ break;
+ }
+ }
+ return FALSE;
+}
+
+
+/* Call-back for ppc64_elf_size_stubs. */
+
+/* Create a new stub section, and arrange for it to be linked
+ immediately before INPUT_SECTION. */
+
+static asection *
+ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
+{
+ asection *stub_sec;
+ flagword flags;
+ asection *output_section;
+ const char *secname;
+ lang_output_section_statement_type *os;
+ struct hook_stub_info info;
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+ | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
+ stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
+ stub_sec_name, flags);
+ if (stub_sec == NULL)
+ goto err_ret;
+
+ output_section = input_section->output_section;
+ secname = bfd_get_section_name (output_section->owner, output_section);
+ os = lang_output_section_find (secname);
+
+ info.input_section = input_section;
+ lang_list_init (&info.add);
+ lang_add_section (&info.add, stub_sec, os);
+
+ if (info.add.head == NULL)
+ goto err_ret;
+
+ stub_added = 1;
+ if (hook_in_stub (&info, &os->children.head))
+ return stub_sec;
+
+ err_ret:
+ einfo ("%X%P: can not make stub section: %E\n");
+ return NULL;
+}
+
+
+/* Another call-back for ppc64_elf_size_stubs. */
-/* Call the back-end function to set TOC base after we have placed all
- the sections. */
static void
-gld${EMULATION_NAME}_after_allocation ()
+ppc_layout_sections_again (void)
{
- if (!ppc64_elf_set_toc (output_bfd, &link_info))
- einfo ("%X%P: can not set TOC base: %E\n");
+ /* If we have changed sizes of the stub sections, then we need
+ to recalculate all the section offsets. This may mean we need to
+ add even more stubs. */
+ gld${EMULATION_NAME}_map_segments (TRUE);
+
+ if (!link_info.relocatable)
+ _bfd_set_gp_value (link_info.output_bfd,
+ ppc64_elf_toc (link_info.output_bfd));
+
+ need_laying_out = -1;
}
-/* Final emulation specific call. PowerPC64 has 24 byte .plt entries,
- and needs different call stubs for any entries that cross a 64k
- boundary relative to the TOC. That means we need to wait until all
- sections have been laid out to initialise the stubs. */
static void
-gld${EMULATION_NAME}_finish ()
+build_toc_list (lang_statement_union_type *statement)
{
- /* If generating a relocatable output file, then we don't have any
- stubs. */
- if (link_info.relocateable)
- return;
+ if (statement->header.type == lang_input_section_enum)
+ {
+ asection *i = statement->input_section.section;
+
+ if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
+ && (i->flags & SEC_EXCLUDE) == 0
+ && i->output_section == toc_section)
+ {
+ if (!ppc64_elf_next_toc_section (&link_info, i))
+ einfo ("%X%P: linker script separates .got and .toc\n");
+ }
+ }
+}
+
- /* bfd_elf64_discard_info just plays with debugging sections,
- ie. doesn't affect any code, so we can delay resizing the
+static void
+build_section_lists (lang_statement_union_type *statement)
+{
+ if (statement->header.type == lang_input_section_enum)
+ {
+ asection *i = statement->input_section.section;
+
+ if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
+ && (i->flags & SEC_EXCLUDE) == 0
+ && i->output_section != NULL
+ && i->output_section->owner == link_info.output_bfd)
+ {
+ if (!ppc64_elf_next_input_section (&link_info, i))
+ einfo ("%X%P: can not size stub section: %E\n");
+ }
+ }
+}
+
+
+/* Call the back-end function to set TOC base after we have placed all
+ the sections. */
+static void
+gld${EMULATION_NAME}_after_allocation (void)
+{
+ /* bfd_elf_discard_info just plays with data and debugging sections,
+ ie. doesn't affect code size, so we can delay resizing the
sections. It's likely we'll resize everything in the process of
- adjusting stub sizes. */
- if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
+ adding stubs. */
+ if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
need_laying_out = 1;
- while (1)
+ /* If generating a relocatable output file, then we don't have any
+ stubs. */
+ if (stub_file != NULL && !link_info.relocatable)
{
- /* Call into the BFD backend to do the real work. */
- if (! ppc64_elf_size_stubs (output_bfd, &link_info, &need_laying_out))
+ int ret = ppc64_elf_setup_section_lists (&link_info,
+ &ppc_add_stub_section,
+ &ppc_layout_sections_again);
+ if (ret < 0)
+ einfo ("%X%P: can not size stub section: %E\n");
+ else if (ret > 0)
{
- einfo ("%X%P: can not size stub section: %E\n");
- return;
+ ppc64_elf_start_multitoc_partition (&link_info);
+
+ if (!no_multi_toc)
+ {
+ toc_section = bfd_get_section_by_name (link_info.output_bfd,
+ ".got");
+ if (toc_section != NULL)
+ lang_for_each_statement (build_toc_list);
+ }
+
+ if (ppc64_elf_layout_multitoc (&link_info)
+ && !no_multi_toc
+ && toc_section != NULL)
+ lang_for_each_statement (build_toc_list);
+
+ ppc64_elf_finish_multitoc_partition (&link_info);
+
+ lang_for_each_statement (build_section_lists);
+
+ /* Call into the BFD backend to do the real work. */
+ if (!ppc64_elf_size_stubs (&link_info, group_size))
+ einfo ("%X%P: can not size stub section: %E\n");
}
+ }
- if (!need_laying_out)
- break;
+ if (need_laying_out != -1)
+ {
+ gld${EMULATION_NAME}_map_segments (need_laying_out);
- /* If we have changed the size of the stub section, then we need
- to recalculate all the section offsets. After this, we may
- need to adjust the stub size again. */
- need_laying_out = 0;
+ if (!link_info.relocatable)
+ _bfd_set_gp_value (link_info.output_bfd,
+ ppc64_elf_toc (link_info.output_bfd));
+ }
+}
- lang_reset_memory_regions ();
- /* Resize the sections. */
- lang_size_sections (stat_ptr->head, abs_output_section,
- &stat_ptr->head, 0, (bfd_vma) 0, NULL);
+/* Final emulation specific call. */
- /* Recalculate TOC base. */
- ldemul_after_allocation ();
+static void
+gld${EMULATION_NAME}_finish (void)
+{
+ /* e_entry on PowerPC64 points to the function descriptor for
+ _start. If _start is missing, default to the first function
+ descriptor in the .opd section. */
+ entry_section = ".opd";
- /* Do the assignments again. */
- lang_do_assignments (stat_ptr->head, abs_output_section,
- (fill_type) 0, (bfd_vma) 0);
+ if (link_info.relocatable)
+ {
+ asection *toc = bfd_get_section_by_name (link_info.output_bfd, ".toc");
+ if (toc != NULL
+ && bfd_section_size (link_info.output_bfd, toc) > 0x10000)
+ einfo ("%X%P: TOC section size exceeds 64k\n");
}
- if (! ppc64_elf_build_stubs (output_bfd, &link_info))
- einfo ("%X%P: can not build stubs: %E\n");
+ if (stub_added)
+ {
+ char *msg = NULL;
+ char *line, *endline;
+
+ if (emit_stub_syms < 0)
+ emit_stub_syms = 1;
+ if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
+ config.stats ? &msg : NULL))
+ einfo ("%X%P: can not build stubs: %E\n");
+
+ for (line = msg; line != NULL; line = endline)
+ {
+ endline = strchr (line, '\n');
+ if (endline != NULL)
+ *endline++ = '\0';
+ fprintf (stderr, "%s: %s\n", program_name, line);
+ }
+ if (msg != NULL)
+ free (msg);
+ }
+
+ ppc64_elf_restore_symbols (&link_info);
+ finish_default ();
+}
+
+
+/* Add a pattern matching ".foo" for every "foo" in a version script.
+
+ The reason for doing this is that many shared library version
+ scripts export a selected set of functions or data symbols, forcing
+ others local. eg.
+
+ . VERS_1 {
+ . global:
+ . this; that; some; thing;
+ . local:
+ . *;
+ . };
+
+ To make the above work for PowerPC64, we need to export ".this",
+ ".that" and so on, otherwise only the function descriptor syms are
+ exported. Lack of an exported function code sym may cause a
+ definition to be pulled in from a static library. */
+
+static struct bfd_elf_version_expr *
+gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
+{
+ struct bfd_elf_version_expr *dot_entry;
+ unsigned int len;
+ char *dot_pat;
+
+ if (!dotsyms
+ || entry->pattern[0] == '.'
+ || (!entry->literal && entry->pattern[0] == '*'))
+ return entry;
+
+ dot_entry = xmalloc (sizeof *dot_entry);
+ *dot_entry = *entry;
+ dot_entry->next = entry;
+ len = strlen (entry->pattern) + 2;
+ dot_pat = xmalloc (len);
+ dot_pat[0] = '.';
+ memcpy (dot_pat + 1, entry->pattern, len - 1);
+ dot_entry->pattern = dot_pat;
+ return dot_entry;
+}
+
+
+/* Avoid processing the fake stub_file in vercheck, stat_needed and
+ check_needed routines. */
+
+static void (*real_func) (lang_input_statement_type *);
+
+static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
+{
+ if (l != stub_file)
+ (*real_func) (l);
+}
+
+static void
+ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
+{
+ real_func = func;
+ lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
}
+
+#define lang_for_each_input_file ppc_lang_for_each_input_file
+
EOF
+if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
+ fragment <<EOF
+/* Special handling for embedded SPU executables. */
+extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
+static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
+
+static bfd_boolean
+ppc64_recognized_file (lang_input_statement_type *entry)
+{
+ if (embedded_spu_file (entry, "-m64"))
+ return TRUE;
+
+ return gld${EMULATION_NAME}_load_symbols (entry);
+}
+EOF
+LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
+fi
+
+# Define some shell vars to insert bits of code into the standard elf
+# parse_args and list_options functions.
+#
+PARSE_AND_LIST_PROLOGUE='
+#define OPTION_STUBGROUP_SIZE 301
+#define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
+#define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
+#define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
+#define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
+#define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
+#define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
+#define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
+#define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
+#define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
+#define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_MULTI_TOC + 1)
+'
+
+PARSE_AND_LIST_LONGOPTS='
+ { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
+ { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
+ { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
+ { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
+ { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
+ { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
+ { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
+ { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
+ { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
+ { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
+ { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
+'
+
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _("\
+ --stub-group-size=N Maximum size of a group of input sections that\n\
+ can be handled by one stub section. A negative\n\
+ value locates all stubs before their branches\n\
+ (with a group size of -N), while a positive\n\
+ value allows two groups of input sections, one\n\
+ before, and one after each stub section.\n\
+ Values of +/-1 indicate the linker should\n\
+ choose suitable defaults.\n"
+ ));
+ fprintf (file, _("\
+ --emit-stub-syms Label linker stubs with a symbol.\n"
+ ));
+ fprintf (file, _("\
+ --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
+ ));
+ fprintf (file, _("\
+ --dotsyms For every version pattern \"foo\" in a version\n\
+ script, add \".foo\" so that function code\n\
+ symbols are treated the same as function\n\
+ descriptor symbols. Defaults to on.\n"
+ ));
+ fprintf (file, _("\
+ --no-dotsyms Don'\''t do anything special in version scripts.\n"
+ ));
+ fprintf (file, _("\
+ --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
+ ));
+ fprintf (file, _("\
+ --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
+ ));
+ fprintf (file, _("\
+ --no-opd-optimize Don'\''t optimize the OPD section.\n"
+ ));
+ fprintf (file, _("\
+ --no-toc-optimize Don'\''t optimize the TOC section.\n"
+ ));
+ fprintf (file, _("\
+ --no-multi-toc Disallow automatic multiple toc sections.\n"
+ ));
+ fprintf (file, _("\
+ --non-overlapping-opd Canonicalize .opd, so that there are no\n\
+ overlapping .opd entries.\n"
+ ));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_STUBGROUP_SIZE:
+ {
+ const char *end;
+ group_size = bfd_scan_vma (optarg, &end, 0);
+ if (*end)
+ einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
+ }
+ break;
+
+ case OPTION_STUBSYMS:
+ emit_stub_syms = 1;
+ break;
+
+ case OPTION_NO_STUBSYMS:
+ emit_stub_syms = 0;
+ break;
+
+ case OPTION_DOTSYMS:
+ dotsyms = 1;
+ break;
+
+ case OPTION_NO_DOTSYMS:
+ dotsyms = 0;
+ break;
+
+ case OPTION_NO_TLS_OPT:
+ no_tls_opt = 1;
+ break;
+
+ case OPTION_NO_TLS_GET_ADDR_OPT:
+ no_tls_get_addr_opt = 1;
+ break;
+
+ case OPTION_NO_OPD_OPT:
+ no_opd_opt = 1;
+ break;
+
+ case OPTION_NO_TOC_OPT:
+ no_toc_opt = 1;
+ break;
+
+ case OPTION_NO_MULTI_TOC:
+ no_multi_toc = 1;
+ break;
+
+ case OPTION_NON_OVERLAPPING_OPD:
+ non_overlapping_opd = 1;
+ break;
+'
+
# Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
#
+LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
+LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern