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-rw-r--r--ld/emultempl/mipself.em283
1 files changed, 283 insertions, 0 deletions
diff --git a/ld/emultempl/mipself.em b/ld/emultempl/mipself.em
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+++ b/ld/emultempl/mipself.em
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+# This shell script emits a C file. -*- C -*-
+# Copyright (C) 2004-2014 Free Software Foundation, Inc.
+#
+# 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 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.
+
+fragment <<EOF
+
+#include "ldctor.h"
+#include "elf/mips.h"
+#include "elfxx-mips.h"
+
+#define is_mips_elf(bfd) \
+ (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
+ && elf_tdata (bfd) != NULL \
+ && elf_object_id (bfd) == MIPS_ELF_DATA)
+
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+static bfd *stub_bfd;
+
+static bfd_boolean insn32;
+
+static void
+mips_after_parse (void)
+{
+ /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
+ ways. .gnu.hash needs symbols to be grouped by hash code whereas the
+ MIPS ABI requires a mapping between the GOT and the symbol table. */
+ if (link_info.emit_gnu_hash)
+ {
+ einfo ("%X%P: .gnu.hash is incompatible with the MIPS ABI\n");
+ link_info.emit_hash = TRUE;
+ link_info.emit_gnu_hash = FALSE;
+ }
+ after_parse_default ();
+}
+
+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 (info->input_section == NULL
+ || 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;
+}
+
+/* Create a new stub section called STUB_SEC_NAME and arrange for it to
+ be linked in OUTPUT_SECTION. The section should go at the beginning of
+ OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
+ before INPUT_SECTION. */
+
+static asection *
+mips_add_stub_section (const char *stub_sec_name, asection *input_section,
+ asection *output_section)
+{
+ asection *stub_sec;
+ flagword flags;
+ lang_output_section_statement_type *os;
+ struct hook_stub_info info;
+
+ /* PR 12845: If the input section has been garbage collected it will
+ not have its output section set to *ABS*. */
+ if (bfd_is_abs_section (output_section))
+ return NULL;
+
+ /* Create the stub file, if we haven't already. */
+ if (stub_file == NULL)
+ {
+ stub_file = lang_add_input_file ("linker stubs",
+ lang_input_file_is_fake_enum,
+ NULL);
+ stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
+ if (stub_bfd == NULL
+ || !bfd_set_arch_mach (stub_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 NULL;
+ }
+ stub_bfd->flags |= BFD_LINKER_CREATED;
+ stub_file->the_bfd = stub_bfd;
+ ldlang_add_file (stub_file);
+ }
+
+ /* Create the section. */
+ stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
+ if (stub_sec == NULL)
+ goto err_ret;
+
+ /* Set the flags. */
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+ | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
+ if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
+ goto err_ret;
+
+ os = lang_output_section_get (output_section);
+
+ /* Initialize a statement list that contains only the new statement. */
+ lang_list_init (&info.add);
+ lang_add_section (&info.add, stub_sec, NULL, os);
+ if (info.add.head == NULL)
+ goto err_ret;
+
+ /* Insert the new statement in the appropriate place. */
+ info.input_section = input_section;
+ 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;
+}
+
+/* This is called before the input files are opened. */
+
+static void
+mips_create_output_section_statements (void)
+{
+ struct elf_link_hash_table *htab;
+
+ htab = elf_hash_table (&link_info);
+ if (is_elf_hash_table (htab) && is_mips_elf (link_info.output_bfd))
+ _bfd_mips_elf_insn32 (&link_info, insn32);
+
+ if (is_mips_elf (link_info.output_bfd))
+ _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
+}
+
+/* This is called after we have merged the private data of the input bfds. */
+
+static void
+mips_before_allocation (void)
+{
+ flagword flags;
+
+ flags = elf_elfheader (link_info.output_bfd)->e_flags;
+ if (!link_info.shared
+ && !link_info.nocopyreloc
+ && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
+ _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
+
+ gld${EMULATION_NAME}_before_allocation ();
+}
+
+/* Avoid processing the fake stub_file in vercheck, stat_needed and
+ check_needed routines. */
+
+static void (*real_func) (lang_input_statement_type *);
+
+static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
+{
+ if (l != stub_file)
+ (*real_func) (l);
+}
+
+static void
+mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
+{
+ real_func = func;
+ lang_for_each_input_file (&mips_for_each_input_file_wrapper);
+}
+
+#define lang_for_each_input_file mips_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_INSN32 301
+#define OPTION_NO_INSN32 (OPTION_INSN32 + 1)
+'
+
+PARSE_AND_LIST_LONGOPTS='
+ { "insn32", no_argument, NULL, OPTION_INSN32 },
+ { "no-insn32", no_argument, NULL, OPTION_NO_INSN32 },
+'
+
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _("\
+ --insn32 Only generate 32-bit microMIPS instructions\n"
+ ));
+ fprintf (file, _("\
+ --no-insn32 Generate all microMIPS instructions\n"
+ ));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_INSN32:
+ insn32 = TRUE;
+ break;
+
+ case OPTION_NO_INSN32:
+ insn32 = FALSE;
+ break;
+'
+
+LDEMUL_AFTER_PARSE=mips_after_parse
+LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements
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