# This shell script emits a C file. -*- C -*-
-# Copyright 2002 Free Software Foundation, Inc.
+# Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
#
# This file is part of GLD, the Gnu Linker.
#
#
cat >>e${EMULATION_NAME}.c <<EOF
+#include "ldctor.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
#include "elf64-ppc.h"
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+static int stub_added = 0;
+
+/* Whether we need to call ppc_layout_sections_again. */
static int need_laying_out = 0;
-static void gld${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 notlsopt = 0;
+
+/* Whether to emit symbols for stubs. */
+static int emit_stub_syms = 0;
+
+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)
+{
+ extern const bfd_target bfd_elf64_powerpc_vec;
+ extern const bfd_target bfd_elf64_powerpcle_vec;
+
+ if (link_info.hash->creator != &bfd_elf64_powerpc_vec
+ && link_info.hash->creator != &bfd_elf64_powerpcle_vec)
+ 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", output_bfd);
+ if (stub_file->the_bfd == NULL
+ || !bfd_set_arch_mach (stub_file->the_bfd,
+ bfd_get_arch (output_bfd),
+ bfd_get_mach (output_bfd)))
+ {
+ einfo ("%X%P: can not create BFD %E\n");
+ return;
+ }
+
+ 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 (!ppc64_elf_edit_opd (output_bfd, &link_info, non_overlapping_opd))
+ {
+ einfo ("%X%P: can not edit opd %E\n");
+ return;
+ }
+
+ if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
+ {
+ /* Size the sections. This is premature, but we want to know the
+ TLS segment layout so that certain optimizations can be done. */
+ lang_size_sections (stat_ptr->head, abs_output_section,
+ &stat_ptr->head, 0, 0, NULL, TRUE);
+
+ if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
+ {
+ einfo ("%X%P: TLS problem %E\n");
+ return;
+ }
+
+ /* We must not cache anything from the preliminary sizing. */
+ elf_tdata (output_bfd)->program_header_size = 0;
+ lang_reset_memory_regions ();
+ }
+ }
+
+ 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;
+
+ stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
+ if (stub_sec == NULL)
+ goto err_ret;
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+ | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
+ if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
+ 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, stub_file);
+
+ 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. */
+
+static void
+ppc_layout_sections_again (void)
+{
+ /* 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. */
+ need_laying_out = 0;
+
+ lang_reset_memory_regions ();
+
+ /* Resize the sections. */
+ lang_size_sections (stat_ptr->head, abs_output_section,
+ &stat_ptr->head, 0, 0, NULL, TRUE);
+
+ /* Recalculate TOC base. */
+ ldemul_after_allocation ();
+
+ /* Do the assignments again. */
+ lang_do_assignments (stat_ptr->head, abs_output_section, NULL, 0);
+}
+
/* Call the back-end function to set TOC base after we have placed all
the sections. */
static void
-gld${EMULATION_NAME}_after_allocation ()
+gld${EMULATION_NAME}_after_allocation (void)
{
- if (!ppc64_elf_set_toc (output_bfd, &link_info))
- einfo ("%X%P: can not set TOC base: %E\n");
+ if (!link_info.relocatable)
+ _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
}
-/* 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${EMULATION_NAME}_finish ()
+build_toc_list (lang_statement_union_type *statement)
{
- /* If generating a relocatable output file, then we don't have any
- stubs. */
- if (link_info.relocateable)
- return;
+ if (statement->header.type == lang_input_section_enum
+ && !statement->input_section.ifile->just_syms_flag
+ && (statement->input_section.section->flags & SEC_EXCLUDE) == 0
+ && statement->input_section.section->output_section == toc_section)
+ ppc64_elf_next_toc_section (&link_info, statement->input_section.section);
+}
+
+
+static void
+build_section_lists (lang_statement_union_type *statement)
+{
+ if (statement->header.type == lang_input_section_enum
+ && !statement->input_section.ifile->just_syms_flag
+ && (statement->input_section.section->flags & SEC_EXCLUDE) == 0
+ && statement->input_section.section->output_section != NULL
+ && statement->input_section.section->output_section->owner == output_bfd)
+ {
+ if (!ppc64_elf_next_input_section (&link_info,
+ statement->input_section.section))
+ einfo ("%X%P: can not size stub section: %E\n");
+ }
+}
+
- /* bfd_elf64_discard_info just plays with debugging sections,
+/* Final emulation specific call. */
+
+static void
+gld${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";
+
+ /* bfd_elf_discard_info just plays with debugging sections,
ie. doesn't affect any code, 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 (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 (output_bfd, &link_info);
+ if (ret != 0)
{
- einfo ("%X%P: can not size stub section: %E\n");
- return;
+ if (ret < 0)
+ {
+ einfo ("%X%P: can not size stub section: %E\n");
+ return;
+ }
+
+ toc_section = bfd_get_section_by_name (output_bfd, ".got");
+ if (toc_section != NULL)
+ lang_for_each_statement (build_toc_list);
+
+ ppc64_elf_reinit_toc (output_bfd, &link_info);
+
+ lang_for_each_statement (build_section_lists);
+
+ /* Call into the BFD backend to do the real work. */
+ if (!ppc64_elf_size_stubs (output_bfd,
+ &link_info,
+ group_size,
+ &ppc_add_stub_section,
+ &ppc_layout_sections_again))
+ {
+ einfo ("%X%P: can not size stub section: %E\n");
+ return;
+ }
+ }
+ }
+
+ if (need_laying_out)
+ ppc_layout_sections_again ();
+
+ if (link_info.relocatable)
+ {
+ asection *toc = bfd_get_section_by_name (output_bfd, ".toc");
+ if (toc != NULL
+ && bfd_section_size (output_bfd, toc) > 0x10000)
+ einfo ("%X%P: TOC section size exceeds 64k\n");
+ }
+
+ if (stub_added)
+ {
+ char *msg = NULL;
+ char *line, *endline;
+
+ 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);
+}
+
- if (!need_laying_out)
- break;
+/* Add a pattern matching ".foo" for every "foo" in a version script.
- /* 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;
+ 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.
- /* Resize the sections. */
- lang_size_sections (stat_ptr->head, abs_output_section,
- &stat_ptr->head, 0, (bfd_vma) 0, NULL);
+ . VERS_1 {
+ . global:
+ . this; that; some; thing;
+ . local:
+ . *;
+ . };
- /* Recalculate TOC base. */
- ldemul_after_allocation ();
+ 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. */
- /* Do the assignments again. */
- lang_do_assignments (stat_ptr->head, abs_output_section,
- (fill_type) 0, (bfd_vma) 0);
+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->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;
+ if (entry->symbol != NULL)
+ {
+ len = strlen (entry->symbol) + 2;
+ dot_pat = xmalloc (len);
+ dot_pat[0] = '.';
+ memcpy (dot_pat + 1, entry->symbol, len - 1);
+ dot_entry->symbol = 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 *);
- if (! ppc64_elf_build_stubs (output_bfd, &link_info))
- einfo ("%X%P: can not build stubs: %E\n");
+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
+# 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_DOTSYMS (OPTION_STUBSYMS + 1)
+#define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
+#define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
+#define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_TLS_OPT + 1)
+'
+
+PARSE_AND_LIST_LONGOPTS='
+ { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
+ { "emit-stub-syms", no_argument, NULL, OPTION_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 },
+ { "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 can be\n\
+ handled by one stub section. A negative value\n\
+ locates all stubs before their branches (with a\n\
+ group size of -N), while a positive value allows\n\
+ two groups of input sections, one before, and one\n\
+ after each stub section. Values of +/-1 indicate\n\
+ the linker should choose suitable defaults.\n"
+ ));
+ fprintf (file, _("\
+ --emit-stub-syms Label linker stubs with a symbol.\n"
+ ));
+ fprintf (file, _("\
+ --dotsyms For every version pattern \"foo\" in a version script,\n\
+ add \".foo\" so that function code symbols are\n\
+ treated the same as function descriptor symbols.\n\
+ 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, _("\
+ --non-overlapping-opd Canonicalize .opd, so that there are no overlapping\n\
+ .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_DOTSYMS:
+ dotsyms = 1;
+ break;
+
+ case OPTION_NO_DOTSYMS:
+ dotsyms = 0;
+ break;
+
+ case OPTION_NO_TLS_OPT:
+ notlsopt = 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
projects / deliverable / binutils-gdb.git / blobdiff