[deliverable/binutils-gdb.git] / ld / emultempl / mipself.em

# This shell script emits a C file. -*- C -*-
#   Copyright 2004, 2006, 2007, 2008 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 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;
  const char *secname;
  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;

  /* Create an output section statement.  */
  secname = bfd_get_section_name (output_section->owner, output_section);
  os = lang_output_section_find (secname);

  /* 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)
{
  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

LDEMUL_AFTER_PARSE=mips_after_parse
LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements
Commit	Line	Data
73934d31	1	# This shell script emits a C file. -- C --
aa820537	2	# Copyright 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
73934d31	3	#
f96b4a7b	4	# This file is part of the GNU Binutils.
73934d31 RS	5	#
	6	# This program is free software; you can redistribute it and/or modify
	7	# it under the terms of the GNU General Public License as published by
f96b4a7b	8	# the Free Software Foundation; either version 3 of the License, or
73934d31 RS	9	# (at your option) any later version.
	10	#
	11	# This program is distributed in the hope that it will be useful,
	12	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	# GNU General Public License for more details.
	15	#
	16	# You should have received a copy of the GNU General Public License
f96b4a7b NC	17	# along with this program; if not, write to the Free Software
	18	# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	19	# MA 02110-1301, USA.
73934d31	20
92b93329	21	fragment <<EOF
861fb55a DJ	22
	23	#include "ldctor.h"
	24	#include "elf/mips.h"
	25	#include "elfxx-mips.h"
	26
	27	#define is_mips_elf(bfd) \
	28	(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
	29	&& elf_tdata (bfd) != NULL \
4dfe6ac6	30	&& elf_object_id (bfd) == MIPS_ELF_DATA)
861fb55a DJ	31
	32	/* Fake input file for stubs. */
	33	static lang_input_statement_type *stub_file;
	34	static bfd *stub_bfd;
	35
73934d31 RS	36	static void
	37	mips_after_parse (void)
	38	{
	39	/* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
	40	ways. .gnu.hash needs symbols to be grouped by hash code whereas the
	41	MIPS ABI requires a mapping between the GOT and the symbol table. */
	42	if (link_info.emit_gnu_hash)
	43	{
	44	einfo ("%X%P: .gnu.hash is incompatible with the MIPS ABI\n");
	45	link_info.emit_hash = TRUE;
	46	link_info.emit_gnu_hash = FALSE;
	47	}
	48	after_parse_default ();
	49	}
861fb55a DJ	50
	51	struct hook_stub_info
	52	{
	53	lang_statement_list_type add;
	54	asection *input_section;
	55	};
	56
	57	/* Traverse the linker tree to find the spot where the stub goes. */
	58
	59	static bfd_boolean
	60	hook_in_stub (struct hook_stub_info info, lang_statement_union_type *lp)
	61	{
	62	lang_statement_union_type *l;
	63	bfd_boolean ret;
	64
	65	for (; (l = *lp) != NULL; lp = &l->header.next)
	66	{
	67	switch (l->header.type)
	68	{
	69	case lang_constructors_statement_enum:
	70	ret = hook_in_stub (info, &constructor_list.head);
	71	if (ret)
	72	return ret;
	73	break;
	74
	75	case lang_output_section_statement_enum:
	76	ret = hook_in_stub (info,
	77	&l->output_section_statement.children.head);
	78	if (ret)
	79	return ret;
	80	break;
	81
	82	case lang_wild_statement_enum:
	83	ret = hook_in_stub (info, &l->wild_statement.children.head);
	84	if (ret)
	85	return ret;
	86	break;
	87
	88	case lang_group_statement_enum:
	89	ret = hook_in_stub (info, &l->group_statement.children.head);
	90	if (ret)
	91	return ret;
	92	break;
	93
	94	case lang_input_section_enum:
	95	if (info->input_section == NULL
	96	\|\| l->input_section.section == info->input_section)
	97	{
	98	/* We've found our section. Insert the stub immediately
	99	before its associated input section. */
	100	*lp = info->add.head;
	101	*(info->add.tail) = l;
	102	return TRUE;
	103	}
	104	break;
	105
	106	case lang_data_statement_enum:
	107	case lang_reloc_statement_enum:
	108	case lang_object_symbols_statement_enum:
	109	case lang_output_statement_enum:
	110	case lang_target_statement_enum:
	111	case lang_input_statement_enum:
	112	case lang_assignment_statement_enum:
	113	case lang_padding_statement_enum:
114	case lang_address_statement_enum:
115	case lang_fill_statement_enum:
116	break;
117
118	default:
119	FAIL ();
120	break;
121	}
122	}
123	return FALSE;
124	}
125
126	/* Create a new stub section called STUB_SEC_NAME and arrange for it to
127	be linked in OUTPUT_SECTION. The section should go at the beginning of
128	OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
129	before INPUT_SECTION. */
130
131	static asection *
132	mips_add_stub_section (const char stub_sec_name, asection input_section,
133	asection *output_section)
134	{
135	asection *stub_sec;
136	flagword flags;
137	const char *secname;
138	lang_output_section_statement_type *os;
139	struct hook_stub_info info;
140
ba85c43e NC	141	/* PR 12845: If the input section has been garbage collected it will
	142	not have its output section set to ABS. */
	143	if (bfd_is_abs_section (output_section))
	144	return NULL;
	145
861fb55a DJ	146	/* Create the stub file, if we haven't already. */
	147	if (stub_file == NULL)
	148	{
	149	stub_file = lang_add_input_file ("linker stubs",
	150	lang_input_file_is_fake_enum,
	151	NULL);
	152	stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
	153	if (stub_bfd == NULL
	154	\|\| !bfd_set_arch_mach (stub_bfd,
	155	bfd_get_arch (link_info.output_bfd),
	156	bfd_get_mach (link_info.output_bfd)))
	157	{
	158	einfo ("%F%P: can not create BFD %E\n");
	159	return NULL;
	160	}
	161	stub_bfd->flags \|= BFD_LINKER_CREATED;
	162	stub_file->the_bfd = stub_bfd;
	163	ldlang_add_file (stub_file);
	164	}
	165
	166	/* Create the section. */
	167	stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
	168	if (stub_sec == NULL)
	169	goto err_ret;
	170
	171	/* Set the flags. */
	172	flags = (SEC_ALLOC \| SEC_LOAD \| SEC_READONLY \| SEC_CODE
	173	\| SEC_HAS_CONTENTS \| SEC_IN_MEMORY \| SEC_KEEP);
	174	if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
	175	goto err_ret;
	176
	177	/* Create an output section statement. */
	178	secname = bfd_get_section_name (output_section->owner, output_section);
	179	os = lang_output_section_find (secname);
	180
	181	/* Initialize a statement list that contains only the new statement. */
	182	lang_list_init (&info.add);
b9c361e0	183	lang_add_section (&info.add, stub_sec, NULL, os);
861fb55a DJ	184	if (info.add.head == NULL)
	185	goto err_ret;
	186
	187	/* Insert the new statement in the appropriate place. */
	188	info.input_section = input_section;
	189	if (hook_in_stub (&info, &os->children.head))
	190	return stub_sec;
	191
	192	err_ret:
	193	einfo ("%X%P: can not make stub section: %E\n");
	194	return NULL;
	195	}
	196
	197	/* This is called before the input files are opened. */
	198
	199	static void
	200	mips_create_output_section_statements (void)
	201	{
	202	if (is_mips_elf (link_info.output_bfd))
	203	_bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
	204	}
	205
	206	/* This is called after we have merged the private data of the input bfds. */
	207
	208	static void
	209	mips_before_allocation (void)
	210	{
	211	flagword flags;
	212
	213	flags = elf_elfheader (link_info.output_bfd)->e_flags;
	214	if (!link_info.shared
	215	&& !link_info.nocopyreloc
	216	&& (flags & (EF_MIPS_PIC \| EF_MIPS_CPIC)) == EF_MIPS_CPIC)
	217	_bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
	218
	219	gld${EMULATION_NAME}_before_allocation ();
	220	}
	221
	222	/* Avoid processing the fake stub_file in vercheck, stat_needed and
	223	check_needed routines. */
	224
	225	static void (real_func) (lang_input_statement_type );
	226
	227	static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
	228	{
	229	if (l != stub_file)
	230	(*real_func) (l);
	231	}
	232
	233	static void
	234	mips_lang_for_each_input_file (void (func) (lang_input_statement_type ))
	235	{
	236	real_func = func;
	237	lang_for_each_input_file (&mips_for_each_input_file_wrapper);
	238	}
	239
	240	#define lang_for_each_input_file mips_lang_for_each_input_file
	241
73934d31 RS	242	EOF
	243
	244	LDEMUL_AFTER_PARSE=mips_after_parse
861fb55a DJ	245	LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
861fb55a DJ	246	LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements