[deliverable/binutils-gdb.git] / ld / emultempl / cr16elf.em

# This shell script emits a C file. -*- C -*-
# Copyright (C) 2007-2018 Free Software Foundation, Inc.
# Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com>
#
# 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.
#

# This file is sourced from elf32.em, and defines extra cr16-elf
# specific routines.
#
fragment <<EOF

#include "ldctor.h"

static void check_sections (bfd *, asection *, void *);


/* This function is run after all the input files have been opened.  */

static void
cr16_elf_after_open (void)
{
  /* Call the standard elf routine.  */
  gld${EMULATION_NAME}_after_open ();

  if (command_line.embedded_relocs
      && !bfd_link_relocatable (&link_info))
    {
      bfd *abfd;

      /* In the embedded relocs mode we create a .emreloc section for each
	 input file with a nonzero .data section.  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 either
	     COFF or ELF.  We need to call a special BFD backend function to
	     generate the embedded relocs, and we have such functions only for
	     COFF and ELF.  */
	  if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
	      && bfd_get_flavour (abfd) != bfd_target_elf_flavour)
	    einfo (_("%F%pB: all input objects must be COFF or ELF "
		     "for --embedded-relocs\n"));

	  datasec = bfd_get_section_by_name (abfd, ".data.rel");

	  /* 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, ".emreloc");
	      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, 2)
		  || ! bfd_set_section_size (abfd, relsec,
					     datasec->reloc_count * 8))
		einfo (_("%F%pB: can not create .emreloc section: %E\n"));
	    }

	  /* Double check that all other data sections are empty, as is
	     required for embedded PIC code.  */
	  bfd_map_over_sections (abfd, check_sections, datasec);
	}
    }
}

/* Check that of the data sections, only the .data section has
   relocs.  This is called via bfd_map_over_sections.  */

static void
check_sections (bfd *abfd, asection *sec, void *datasec)
{
  if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0)
      && sec != datasec
      && sec->reloc_count == 0 )
    einfo (_("%pB%X: section %s has relocs; can not use --embedded-relocs\n"),
	   abfd, bfd_get_section_name (abfd, sec));
}

static void
cr16elf_after_parse (void)
{
  /* Always behave as if called with --sort-common command line
     option.
     This is to emulate the CRTools' method of keeping variables
     of different alignment in separate sections.  */
  config.sort_common = TRUE;

  /* Don't create a demand-paged executable, since this feature isn't
     meaninful in CR16 embedded systems. Moreover, when magic_demand_paged
     is true the link sometimes fails.  */
  config.magic_demand_paged = FALSE;

  gld${EMULATION_NAME}_after_parse ();
}

/* This is called after the sections have been attached to output
   sections, but before any sizes or addresses have been set.  */

static void
cr16elf_before_allocation (void)
{
  /* Call the default first.  */
  gld${EMULATION_NAME}_before_allocation ();

  if (command_line.embedded_relocs
      && (!bfd_link_relocatable (&link_info)))
    {

      bfd *abfd;

      /* If we are generating embedded relocs, call a special BFD backend
	 routine to do the work.  */
      for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
	{
	  asection *datasec, *relsec;
	  char *errmsg;

	  datasec = bfd_get_section_by_name (abfd, ".data.rel");

	  if (datasec == NULL || datasec->reloc_count == 0)
	    continue;

	  relsec = bfd_get_section_by_name (abfd, ".emreloc");
	  ASSERT (relsec != NULL);

	  if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,
						       datasec, relsec,
						       &errmsg))
	    {
	      if (errmsg == NULL)
		einfo (_("%pB%X: can not create runtime reloc information: %E\n"),
		       abfd);
	      else
		einfo (_("%X%pB: can not create runtime reloc information: %s\n"),
		       abfd, errmsg);
	    }
	}
    }

  /* Enable relaxation by default if the "--no-relax" option was not
     specified.  This is done here instead of in the before_parse hook
     because there is a check in main() to prohibit use of --relax and
     -r together.  */
  if (RELAXATION_DISABLED_BY_DEFAULT)
    ENABLE_RELAXATION;
}

EOF

# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_AFTER_OPEN=cr16_elf_after_open
LDEMUL_AFTER_PARSE=cr16elf_after_parse
LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation
Commit	Line	Data
3d3d428f	1	# This shell script emits a C file. -- C --
219d1afa	2	# Copyright (C) 2007-2018 Free Software Foundation, Inc.
3d3d428f NC	3	# Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com>
3d3d428f NC	4	#
f96b4a7b	5	# This file is part of the GNU Binutils.
3d3d428f NC	6	#
	7	# This program is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
f96b4a7b	9	# the Free Software Foundation; either version 3 of the License, or
3d3d428f NC	10	# (at your option) any later version.
	11	#
	12	# This program is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; if not, write to the Free Software
f96b4a7b NC	19	# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
f96b4a7b NC	20	# MA 02110-1301, USA.
3d3d428f NC	21	#
	22
	23	# This file is sourced from elf32.em, and defines extra cr16-elf
	24	# specific routines.
	25	#
92b93329	26	fragment <<EOF
3d3d428f NC	27
	28	#include "ldctor.h"
	29
7251ccbf SR	30	static void check_sections (bfd , asection , void *);
	31
	32
	33	/* This function is run after all the input files have been opened. */
	34
	35	static void
	36	cr16_elf_after_open (void)
	37	{
	38	/* Call the standard elf routine. */
	39	gld${EMULATION_NAME}_after_open ();
	40
d003af55 AM	41	if (command_line.embedded_relocs
	42	&& !bfd_link_relocatable (&link_info))
	43	{
	44	bfd *abfd;
7251ccbf SR	45
	46	/* In the embedded relocs mode we create a .emreloc section for each
	47	input file with a nonzero .data section. The BFD backend will fill in
	48	these sections with magic numbers which can be used to relocate the
	49	data section at run time. */
c72f2fb2	50	for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
7251ccbf SR	51	{
	52	asection *datasec;
	53
	54	/* As first-order business, make sure that each input BFD is either
	55	COFF or ELF. We need to call a special BFD backend function to
	56	generate the embedded relocs, and we have such functions only for
	57	COFF and ELF. */
	58	if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
	59	&& bfd_get_flavour (abfd) != bfd_target_elf_flavour)
871b3ab2	60	einfo (_("%F%pB: all input objects must be COFF or ELF "
d003af55	61	"for --embedded-relocs\n"));
7251ccbf SR	62
	63	datasec = bfd_get_section_by_name (abfd, ".data.rel");
	64
	65	/* Note that we assume that the reloc_count field has already
	66	been set up. We could call bfd_get_reloc_upper_bound, but
	67	that returns the size of a memory buffer rather than a reloc
	68	count. We do not want to call bfd_canonicalize_reloc,
	69	because although it would always work it would force us to
	70	read in the relocs into BFD canonical form, which would waste
	71	a significant amount of time and memory. */
	72	if (datasec != NULL && datasec->reloc_count > 0)
	73	{
	74	asection *relsec;
	75
	76	relsec = bfd_make_section (abfd, ".emreloc");
	77	if (relsec == NULL
	78	\|\| ! bfd_set_section_flags (abfd, relsec,
	79	(SEC_ALLOC
	80	\| SEC_LOAD
	81	\| SEC_HAS_CONTENTS
	82	\| SEC_IN_MEMORY))
	83	\|\| ! bfd_set_section_alignment (abfd, relsec, 2)
	84	\|\| ! bfd_set_section_size (abfd, relsec,
	85	datasec->reloc_count * 8))
871b3ab2	86	einfo (_("%F%pB: can not create .emreloc section: %E\n"));
7251ccbf SR	87	}
	88
	89	/* Double check that all other data sections are empty, as is
	90	required for embedded PIC code. */
e4492aa0	91	bfd_map_over_sections (abfd, check_sections, datasec);
7251ccbf SR	92	}
	93	}
	94	}
	95
	96	/* Check that of the data sections, only the .data section has
	97	relocs. This is called via bfd_map_over_sections. */
	98
	99	static void
	100	check_sections (bfd abfd, asection sec, void *datasec)
	101	{
	102	if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0)
d003af55 AM	103	&& sec != datasec
d003af55 AM	104	&& sec->reloc_count == 0 )
871b3ab2	105	einfo (_("%pB%X: section %s has relocs; can not use --embedded-relocs\n"),
7251ccbf SR	106	abfd, bfd_get_section_name (abfd, sec));
	107	}
	108
3d3d428f NC	109	static void
	110	cr16elf_after_parse (void)
	111	{
	112	/* Always behave as if called with --sort-common command line
	113	option.
	114	This is to emulate the CRTools' method of keeping variables
	115	of different alignment in separate sections. */
	116	config.sort_common = TRUE;
	117
	118	/* Don't create a demand-paged executable, since this feature isn't
	119	meaninful in CR16 embedded systems. Moreover, when magic_demand_paged
	120	is true the link sometimes fails. */
	121	config.magic_demand_paged = FALSE;
97b11f40	122
5fe2850d	123	gld${EMULATION_NAME}_after_parse ();
3d3d428f NC	124	}
	125
	126	/* This is called after the sections have been attached to output
	127	sections, but before any sizes or addresses have been set. */
	128
	129	static void
	130	cr16elf_before_allocation (void)
	131	{
	132	/* Call the default first. */
	133	gld${EMULATION_NAME}_before_allocation ();
	134
d003af55 AM	135	if (command_line.embedded_relocs
	136	&& (!bfd_link_relocatable (&link_info)))
	137	{
7251ccbf	138
d003af55	139	bfd *abfd;
7251ccbf	140
d003af55	141	/* If we are generating embedded relocs, call a special BFD backend
7251ccbf	142	routine to do the work. */
d003af55 AM	143	for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
d003af55 AM	144	{
7251ccbf SR	145	asection datasec, relsec;
	146	char *errmsg;
	147
	148	datasec = bfd_get_section_by_name (abfd, ".data.rel");
	149
	150	if (datasec == NULL \|\| datasec->reloc_count == 0)
	151	continue;
	152
	153	relsec = bfd_get_section_by_name (abfd, ".emreloc");
	154	ASSERT (relsec != NULL);
	155
	156	if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,
d003af55 AM	157	datasec, relsec,
	158	&errmsg))
	159	{
	160	if (errmsg == NULL)
871b3ab2	161	einfo (_("%pB%X: can not create runtime reloc information: %E\n"),
d003af55 AM	162	abfd);
d003af55 AM	163	else
871b3ab2	164	einfo (_("%X%pB: can not create runtime reloc information: %s\n"),
d003af55 AM	165	abfd, errmsg);
	166	}
	167	}
	168	}
7251ccbf	169
3d3d428f NC	170	/* Enable relaxation by default if the "--no-relax" option was not
	171	specified. This is done here instead of in the before_parse hook
	172	because there is a check in main() to prohibit use of --relax and
	173	-r together. */
28d5f677 NC	174	if (RELAXATION_DISABLED_BY_DEFAULT)
28d5f677 NC	175	ENABLE_RELAXATION;
3d3d428f NC	176	}
	177
	178	EOF
	179
3d3d428f NC	180	# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation
3d3d428f NC	181	#
7251ccbf	182	LDEMUL_AFTER_OPEN=cr16_elf_after_open
3d3d428f NC	183	LDEMUL_AFTER_PARSE=cr16elf_after_parse
3d3d428f NC	184	LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation