#
cat >>e${EMULATION_NAME}.c <<EOF
+#include "ldctor.h"
#include "elf64-ppc.h"
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+
+/* Whether we need to call ppc_layout_sections_again. */
static int need_laying_out = 0;
+/* Maximum size of a group of input sections that can be handled by
+ one stub section. A value of +/-1 indicates the bfd back-end
+ should use a suitable default size. */
+static bfd_signed_vma group_size = 1;
+
+static void ppc_create_output_section_statements PARAMS ((void));
+static asection *ppc_add_stub_section PARAMS ((const char *, asection *));
+static void ppc_layout_sections_again PARAMS ((void));
static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
-static void gld${EMULATION_NAME}_finish PARAMS ((void));
+static void build_section_lists PARAMS ((lang_statement_union_type *));
+
+/* 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 ()
+{
+ 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);
+}
+
+
+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 boolean hook_in_stub
+ PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
+
+static boolean
+hook_in_stub (info, lp)
+ struct hook_stub_info *info;
+ lang_statement_union_type **lp;
+{
+ lang_statement_union_type *l;
+ 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 (stub_sec_name, input_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;
+
+ 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 ()
+{
+ /* 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, (bfd_vma) 0, NULL);
+
+ /* Recalculate TOC base. */
+ ldemul_after_allocation ();
+
+ /* Do the assignments again. */
+ lang_do_assignments (stat_ptr->head, abs_output_section,
+ (fill_type *) 0, (bfd_vma) 0);
+}
+
/* Call the back-end function to set TOC base after we have placed all
the sections. */
einfo ("%X%P: can not set TOC base: %E\n");
}
-/* 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
+build_section_lists (statement)
+ lang_statement_union_type *statement;
+{
+ if (statement->header.type == lang_input_section_enum
+ && !statement->input_section.ifile->just_syms_flag)
+ {
+ ppc64_elf_next_input_section (output_bfd, &link_info,
+ statement->input_section.section);
+ }
+}
+
+/* Final emulation specific call. */
static void
gld${EMULATION_NAME}_finish ()
{
+ int ret;
+
/* 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. */
/* bfd_elf64_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. */
+ adding stubs. */
if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
need_laying_out = 1;
- while (1)
+ ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
+ if (ret != 0)
{
+ if (ret < 0)
+ {
+ einfo ("%X%P: can not size stub section: %E\n");
+ return;
+ }
+
+ 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, &need_laying_out))
+ if (!ppc64_elf_size_stubs (output_bfd,
+ stub_file->the_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)
- break;
+ if (need_laying_out)
+ ppc_layout_sections_again ();
- /* 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 (stub_file->the_bfd->sections != NULL)
+ {
+ if (!ppc64_elf_build_stubs (&link_info))
+ einfo ("%X%P: can not build stubs: %E\n");
+ }
+}
- lang_reset_memory_regions ();
- /* Resize the sections. */
- lang_size_sections (stat_ptr->head, abs_output_section,
- &stat_ptr->head, 0, (bfd_vma) 0, NULL);
+/* Avoid processing the fake stub_file in vercheck, stat_needed and
+ check_needed routines. */
- /* Recalculate TOC base. */
- ldemul_after_allocation ();
+static void ppc_for_each_input_file_wrapper
+ PARAMS ((lang_input_statement_type *));
+static void ppc_lang_for_each_input_file
+ PARAMS ((void (*) (lang_input_statement_type *)));
- /* Do the assignments again. */
- lang_do_assignments (stat_ptr->head, abs_output_section,
- (fill_type *) 0, (bfd_vma) 0);
- }
+static void (*real_func) PARAMS ((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 (l)
+ lang_input_statement_type *l;
+{
+ if (l != stub_file)
+ (*real_func) (l);
}
+
+static void
+ppc_lang_for_each_input_file (func)
+ void (*func) PARAMS ((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
+'
+
+# The options are repeated below so that no abbreviations are allowed.
+# Otherwise -s matches stub-group-size
+PARSE_AND_LIST_LONGOPTS='
+ { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
+ { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
+'
+
+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"
+ ));
+'
+
+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;
+'
+
# Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
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