-# Copyright 2002 Free Software Foundation, Inc.
+# This shell script emits a C file. -*- C -*-
+# Copyright (C) 2004-2021 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.
-# This shell script emits a C file. -*- C -*-
-
-
-# This file is sourced from elf32.em, and defines some extra routines for m68k
-# embedded systems using ELF and for some other systems using m68k ELF. While
-# it is sourced from elf32.em for all m68k ELF configurations, here we include
-# only the features we want depending on the configuration.
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
case ${target} in
- mips*-*-elf)
- echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c
+ *-*-*gnu*)
+ gnu_target=true
+ ;;
+ *)
+ gnu_target=false
;;
esac
-cat >>e${EMULATION_NAME}.c <<EOF
+fragment <<EOF
-static void mips_elf${ELFSIZE}_after_open PARAMS ((void));
-#ifdef SUPPORT_EMBEDDED_RELOCS
-static void mips_elf${ELFSIZE}_check_sections PARAMS ((bfd *, asection *,
- PTR));
-#endif
-static void mips_elf${ELFSIZE}_after_allocation PARAMS ((void));
+#include "ldctor.h"
+#include "elf/mips.h"
+#include "elfxx-mips.h"
-/* This function is run after all the input files have been opened. */
+#define is_mips_elf(bfd) \
+ (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
+ && elf_tdata (bfd) != NULL \
+ && elf_object_id (bfd) == MIPS_ELF_DATA)
-static void
-mips_elf${ELFSIZE}_after_open()
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+static bfd *stub_bfd;
+
+static bool insn32;
+static bool ignore_branch_isa;
+static bool compact_branches;
+
+struct hook_stub_info
+{
+ lang_statement_list_type add;
+ asection *input_section;
+};
+
+/* Traverse the linker tree to find the spot where the stub goes. */
+
+static bool
+hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
{
- /* Call the standard elf routine. */
- gld${EMULATION_NAME}_after_open ();
-
-#ifdef SUPPORT_EMBEDDED_RELOCS
- if (command_line.embedded_relocs && (! link_info.relocateable))
- {
- bfd *abfd;
-
- /* In the embedded relocs mode we create a .rel.sdata section for
- each input file with a .sdata section which has has
- relocations. The BFD backend will fill in these sections
- with magic numbers which can be used to relocate the data
- section at run time. */
- for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
- {
- asection *datasec;
-
- /* As first-order business, make sure that each input BFD is
- ELF. We need to call a special BFD backend function to
- generate the embedded relocs, and we have that function
- only for ELF */
-
- if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
- einfo ("%F%B: all input objects must be ELF for --embedded-relocs\n");
-
- if (bfd_get_arch_size (abfd) != ${ELFSIZE})
- einfo ("%F%B: all input objects must be ${ELFSIZE}-bit ELF for --embedded-relocs\n");
-
- datasec = bfd_get_section_by_name (abfd, ".sdata");
-
- /* Note that we assume that the reloc_count field has already
- been set up. We could call bfd_get_reloc_upper_bound, but
- that returns the size of a memory buffer rather than a reloc
- count. We do not want to call bfd_canonicalize_reloc,
- because although it would always work it would force us to
- read in the relocs into BFD canonical form, which would waste
- a significant amount of time and memory. */
-
- if (datasec != NULL && datasec->reloc_count > 0)
- {
- asection *relsec;
-
- relsec = bfd_make_section (abfd, ".rel.sdata");
- if (relsec == NULL
- || ! bfd_set_section_flags (abfd, relsec,
- (SEC_ALLOC
- | SEC_LOAD
- | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY))
- || ! bfd_set_section_alignment (abfd, relsec,
- (${ELFSIZE} == 32) ? 2 : 3)
- || ! bfd_set_section_size (abfd, relsec,
- datasec->reloc_count
- * ((${ELFSIZE} / 8) + 8)))
- einfo ("%F%B: cannot create .rel.sdata section: %E\n");
+ lang_statement_union_type *l;
+ bool ret;
+
+ for (; (l = *lp) != NULL; lp = &l->header.next)
+ {
+ switch (l->header.type)
+ {
+ case lang_constructors_statement_enum:
+ ret = hook_in_stub (info, &constructor_list.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_output_section_statement_enum:
+ ret = hook_in_stub (info,
+ &l->output_section_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_wild_statement_enum:
+ ret = hook_in_stub (info, &l->wild_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_group_statement_enum:
+ ret = hook_in_stub (info, &l->group_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_input_section_enum:
+ if (info->input_section == NULL
+ || l->input_section.section == info->input_section)
+ {
+ /* We've found our section. Insert the stub immediately
+ before its associated input section. */
+ *lp = info->add.head;
+ *(info->add.tail) = l;
+ return true;
}
+ break;
+
+ case lang_data_statement_enum:
+ case lang_reloc_statement_enum:
+ case lang_object_symbols_statement_enum:
+ case lang_output_statement_enum:
+ case lang_target_statement_enum:
+ case lang_input_statement_enum:
+ case lang_assignment_statement_enum:
+ case lang_padding_statement_enum:
+ case lang_address_statement_enum:
+ case lang_fill_statement_enum:
+ break;
- /* Double check that all other data sections have no relocs,
- as is required for embedded PIC code. */
- bfd_map_over_sections (abfd, mips_elf${ELFSIZE}_check_sections,
- (PTR) datasec);
- }
+ default:
+ FAIL ();
+ break;
+ }
}
-#endif /* SUPPORT_EMBEDDED_RELOCS */
+ return false;
}
-#ifdef SUPPORT_EMBEDDED_RELOCS
-/* Check that of the data sections, only the .sdata section has
- relocs. This is called via bfd_map_over_sections. */
+/* 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 void
-mips_elf${ELFSIZE}_check_sections (abfd, sec, sdatasec)
- bfd *abfd;
- asection *sec;
- PTR sdatasec;
+static asection *
+mips_add_stub_section (const char *stub_sec_name, asection *input_section,
+ asection *output_section)
{
- if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
- && sec != (asection *) sdatasec
- && sec->reloc_count != 0)
- einfo ("%B%X: section %s has relocs; cannot use --embedded-relocs\n",
- abfd, bfd_get_section_name (abfd, sec));
+ 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_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, 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;
}
-#endif /* SUPPORT_EMBEDDED_RELOCS */
-/* This function is called after the section sizes and offsets have
- been set. If we are generating embedded relocs, it calls a special
- BFD backend routine to do the work. */
+/* This is called before the input files are opened. */
static void
-mips_elf${ELFSIZE}_after_allocation ()
+mips_create_output_section_statements (void)
{
- /* Call the standard elf routine. */
- after_allocation_default ();
+ struct elf_link_hash_table *htab;
-#ifdef SUPPORT_EMBEDDED_RELOCS
- if (command_line.embedded_relocs && (! link_info.relocateable))
- {
- bfd *abfd;
-
- for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
- {
- asection *datasec, *relsec;
- char *errmsg;
+ htab = elf_hash_table (&link_info);
+ if (is_elf_hash_table (htab) && is_mips_elf (link_info.output_bfd))
+ _bfd_mips_elf_linker_flags (&link_info, insn32, ignore_branch_isa,
+ ${gnu_target});
- datasec = bfd_get_section_by_name (abfd, ".sdata");
+ if (is_mips_elf (link_info.output_bfd))
+ {
+ _bfd_mips_elf_compact_branches (&link_info, compact_branches);
+ _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
+ }
+}
- if (datasec == NULL || datasec->reloc_count == 0)
- continue;
+/* This is called after we have merged the private data of the input bfds. */
- relsec = bfd_get_section_by_name (abfd, ".rel.sdata");
- ASSERT (relsec != NULL);
+static void
+mips_before_allocation (void)
+{
+ if (is_mips_elf (link_info.output_bfd))
+ {
+ flagword flags;
- if (! bfd_mips_elf${ELFSIZE}_create_embedded_relocs (abfd,
- &link_info,
- datasec,
- relsec,
- &errmsg))
- {
- if (errmsg == NULL)
- einfo ("%B%X: can not create runtime reloc information: %E\n",
- abfd);
- else
- einfo ("%X%B: can not create runtime reloc information: %s\n",
- abfd, errmsg);
- }
- }
+ flags = elf_elfheader (link_info.output_bfd)->e_flags;
+ if (!bfd_link_pic (&link_info)
+ && !link_info.nocopyreloc
+ && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
+ _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
}
-#endif /* SUPPORT_EMBEDDED_RELOCS */
+
+ gld${EMULATION_NAME}_before_allocation ();
}
EOF
-# We have our own after_open and after_allocation functions, but they call
-# the standard routines, so give them a different name.
-LDEMUL_AFTER_OPEN=mips_elf${ELFSIZE}_after_open
-LDEMUL_AFTER_ALLOCATION=mips_elf${ELFSIZE}_after_allocation
+# Define some shell vars to insert bits of code into the standard elf
+# parse_args and list_options functions.
+#
+PARSE_AND_LIST_PROLOGUE='
+enum
+ {
+ OPTION_INSN32 = 301,
+ OPTION_NO_INSN32,
+ OPTION_IGNORE_BRANCH_ISA,
+ OPTION_NO_IGNORE_BRANCH_ISA,
+ OPTION_COMPACT_BRANCHES,
+ OPTION_NO_COMPACT_BRANCHES
+ };
+'
+
+PARSE_AND_LIST_LONGOPTS='
+ { "insn32", no_argument, NULL, OPTION_INSN32 },
+ { "no-insn32", no_argument, NULL, OPTION_NO_INSN32 },
+ { "ignore-branch-isa", no_argument, NULL, OPTION_IGNORE_BRANCH_ISA },
+ { "no-ignore-branch-isa", no_argument, NULL, OPTION_NO_IGNORE_BRANCH_ISA },
+ { "compact-branches", no_argument, NULL, OPTION_COMPACT_BRANCHES },
+ { "no-compact-branches", no_argument, NULL, OPTION_NO_COMPACT_BRANCHES },
+'
+
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _("\
+ --insn32 Only generate 32-bit microMIPS instructions\n"
+ ));
+ fprintf (file, _("\
+ --no-insn32 Generate all microMIPS instructions\n"
+ ));
+ fprintf (file, _("\
+ --ignore-branch-isa Accept invalid branch relocations requiring\n\
+ an ISA mode switch\n"
+ ));
+ fprintf (file, _("\
+ --no-ignore-branch-isa Reject invalid branch relocations requiring\n\
+ an ISA mode switch\n"
+ ));
+ fprintf (file, _("\
+ --compact-branches Generate compact branches/jumps for MIPS R6\n"
+ ));
+ fprintf (file, _("\
+ --no-compact-branches Generate delay slot branches/jumps for MIPS R6\n"
+ ));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_INSN32:
+ insn32 = true;
+ break;
+
+ case OPTION_NO_INSN32:
+ insn32 = false;
+ break;
+
+ case OPTION_IGNORE_BRANCH_ISA:
+ ignore_branch_isa = true;
+ break;
+
+ case OPTION_NO_IGNORE_BRANCH_ISA:
+ ignore_branch_isa = false;
+ break;
+
+ case OPTION_COMPACT_BRANCHES:
+ compact_branches = true;
+ break;
+
+ case OPTION_NO_COMPACT_BRANCHES:
+ compact_branches = false;
+ break;
+'
+
+LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements
projects / binutils.git / blobdiff