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-rw-r--r--ld/emultempl/cskyelf.em355
1 files changed, 355 insertions, 0 deletions
diff --git a/ld/emultempl/cskyelf.em b/ld/emultempl/cskyelf.em
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+++ b/ld/emultempl/cskyelf.em
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+# This shell script emits a C file. -*- C -*-
+# Copyright (C) 2013-2018 Free Software Foundation, Inc.
+#
+# This file is part of 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+# This file is sourced from elf32.em, and defines extra C-SKY ELF
+# specific routines.
+#
+fragment <<EOF
+
+#include "ldctor.h"
+#include "elf/csky.h"
+
+/* To use branch stub or not. */
+extern bfd_boolean use_branch_stub;
+
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+
+/* Whether we need to call gldcsky_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;
+
+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; l != NULL; lp = &l->header.next, l = *lp)
+ 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
+ after its associated input section. */
+ *(info->add.tail) = l->header.next;
+ l->header.next = info->add.head;
+ 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;
+}
+EOF
+
+case ${target} in
+ csky-*-linux-*)
+fragment <<EOF
+/* This is a convenient point to tell BFD about target specific flags.
+ After the output has been created, but before inputs are read. */
+static void
+csky_elf_create_output_section_statements (void)
+{
+ use_branch_stub = FALSE;
+}
+EOF
+ ;;
+ *)
+fragment <<EOF
+/* This is a convenient point to tell BFD about target specific flags.
+ After the output has been created, but before inputs are read. */
+static void
+csky_elf_create_output_section_statements (void)
+{
+ /* If don't use branch stub, just do not emit stub_file. */
+ if (use_branch_stub == FALSE)
+ return;
+ 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);
+}
+EOF
+ ;;
+esac
+
+fragment <<EOF
+/* Call-back for elf32_csky_size_stubs. */
+
+/* Create a new stub section, and arrange for it to be linked
+ immediately after INPUT_SECTION. */
+static asection *
+elf32_csky_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_RELOC | 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;
+
+ bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
+
+ 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, NULL, os);
+
+ 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 elf_csky_size_stubs. */
+static void
+gldcsky_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. */
+ gld${EMULATION_NAME}_map_segments (TRUE);
+ need_laying_out = -1;
+}
+
+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 (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
+ && (i->flags & SEC_EXCLUDE) == 0
+ && i->output_section != NULL
+ && i->output_section->owner == link_info.output_bfd)
+ elf32_csky_next_input_section (&link_info, i);
+ }
+}
+
+static void
+gld${EMULATION_NAME}_after_allocation (void)
+{
+ /* bfd_elf32_discard_info just plays with debugging sections,
+ ie. doesn't affect any code, so we can delay resizing the
+ sections. It's likely we'll resize everything in the process of
+ adding stubs. */
+ if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
+ need_laying_out = 1;
+
+ /* If generating a relocatable output file, then we don't
+ have to examine the relocs. */
+
+ if (stub_file != NULL && !bfd_link_relocatable (&link_info))
+ {
+ int ret = elf32_csky_setup_section_lists (link_info.output_bfd,
+ &link_info);
+
+ if (ret < 0)
+ {
+ einfo (_("%X%P: could not compute sections lists for stub generation: %E\n"));
+ return;
+ }
+ else if (ret != 0)
+ {
+ lang_for_each_statement (build_section_lists);
+
+ /* Call into the BFD backend to do the real work. */
+ if (! elf32_csky_size_stubs (link_info.output_bfd,
+ stub_file->the_bfd,
+ &link_info,
+ group_size,
+ &elf32_csky_add_stub_section,
+ &gldcsky_layout_sections_again))
+ {
+ einfo (_("%X%P: cannot size stub section: %E\n"));
+ return;
+ }
+ }
+ }
+
+ if (need_laying_out != -1)
+ gld${EMULATION_NAME}_map_segments (need_laying_out);
+}
+
+static void
+gld${EMULATION_NAME}_finish (void)
+{
+ if (stub_file != NULL
+ && !bfd_link_relocatable (&link_info)
+ && stub_file->the_bfd->sections != NULL
+ && !elf32_csky_build_stubs (&link_info))
+ einfo (_("%X%P: cannot build stubs: %E\n"));
+ finish_default ();
+}
+
+/* Avoid processing the fake stub_file in vercheck, stat_needed and
+ check_needed routines. */
+
+static void (*real_func) (lang_input_statement_type *);
+
+static void csky_for_each_input_file_wrapper (lang_input_statement_type *l)
+{
+ if (l != stub_file)
+ (*real_func) (l);
+}
+
+static void
+csky_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
+{
+ real_func = func;
+ lang_for_each_input_file (&csky_for_each_input_file_wrapper);
+}
+
+#define lang_for_each_input_file csky_lang_for_each_input_file
+
+EOF
+
+# This code gets inserted into the generic elf32.sc linker script
+# and allows us to define our own command line switches.
+case ${target} in
+ csky-*-linux-*)
+ ;;
+
+ *)
+PARSE_AND_LIST_PROLOGUE='
+#define OPTION_BRANCH_STUB 301
+#define OPTION_NO_BRANCH_STUB 302
+#define OPTION_STUBGROUP_SIZE 303
+'
+
+PARSE_AND_LIST_LONGOPTS='
+ {"branch-stub", no_argument, NULL, OPTION_BRANCH_STUB},
+ {"no-branch-stub", no_argument, NULL, OPTION_NO_BRANCH_STUB},
+ {"stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE},
+'
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _(" --[no-]branch-stub\n"));
+ fprintf (file, _("\t\t\tDisable/enable use of stubs to expand branch "
+ "instructions that cannot reach the target.\n"));
+ fprintf (file, _(" --stub-group-size=N\n"));
+ fprintf (file, _("\t\t\tMaximum size of a group of input sections "
+ "handled by one stub section."));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_BRANCH_STUB:
+ use_branch_stub = TRUE;
+ break;
+ case OPTION_NO_BRANCH_STUB:
+ use_branch_stub = FALSE;
+ break;
+
+ case OPTION_STUBGROUP_SIZE:
+ {
+ const char *end;
+
+ group_size = bfd_scan_vma (optarg, &end, 0);
+ if (*end)
+ einfo (_("%F%P: invalid number `%s'\''\n"), optarg);
+ }
+ break;
+'
+ ;;
+esac
+
+LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=csky_elf_create_output_section_statements
+LDEMUL_FINISH=gld${EMULATION_NAME}_finish
generated by cgit v1.1 at 2024-10-15 06:14:55 +0000