ld/emultempl/mipself.em - binutils-gdb - Git at Google

 # This shell script emits a C file. -*- C -*-
 #   Copyright (C) 2004-2021 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.

 case ${target} in
   *-*-*gnu*)
     gnu_target=true
     ;;
   *)
     gnu_target=false
     ;;
 esac

 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 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)
 {
   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;

 	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_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;
 }

 /* 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->root) && is_mips_elf (link_info.output_bfd))
     _bfd_mips_elf_linker_flags (&link_info, insn32, ignore_branch_isa,
 				${gnu_target});

   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);
     }
 }

 /* This is called after we have merged the private data of the input bfds.  */

 static void
 mips_before_allocation (void)
 {
   if (is_mips_elf (link_info.output_bfd))
     {
       flagword flags;

       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);
     }

   gld${EMULATION_NAME}_before_allocation ();
 }

 EOF

 # 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
	# This shell script emits a C file. -- C --
	# Copyright (C) 2004-2021 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.

	case ${target} in
	--gnu)
	gnu_target=true
	;;
	*)
	gnu_target=false
	;;
	esac

	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 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)
	{
	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;

	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_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;
	}

	/* 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->root) && is_mips_elf (link_info.output_bfd))
	_bfd_mips_elf_linker_flags (&link_info, insn32, ignore_branch_isa,
	${gnu_target});

	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);
	}
	}

	/* This is called after we have merged the private data of the input bfds. */

	static void
	mips_before_allocation (void)
	{
	if (is_mips_elf (link_info.output_bfd))
	{
	flagword flags;

	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);
	}

	gld${EMULATION_NAME}_before_allocation ();
	}

	EOF

	# 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