Subversion Repositories QNX 8.QNX8 GNU binutils

# This shell script emits a C file. -*- C -*-

#   Copyright 2023 Free Software Foundation, Inc.

#

# This file is part of GLD, the Gnu Linker.

#

# 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

# (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 elf.em, and defines extra Neutrino

# specific routines.

# NTO templates aims to refine the default ${ARCH}elf.em template.

# Pierre-Marie Baty -- yep, but with one exception: if ARCH is i386 or x86_64, the emulation file is elf-x86.em instead

if [ "${ARCH}" = "i386" ] || [ "${ARCH}" = "x86_64" ]; then

	. "${srcdir}/emultempl/elf-x86.em"

	cat >>e${EMULATION_NAME}.c <<EOF

#include "elf/internal.h"

#include "elf/common.h"

#include "elf-bfd.h"

#include "../bfd/libbfd.h"

bool nto_lazy_stack = false;

struct nto_stack_note

{

  unsigned char stacksize[4];

  unsigned char stackalloc[4];

  unsigned char execstack[4];

};

static asection*

nto_create_QNX_note_section(int type)

{

  asection *note_sec;

  flagword flags;

  Elf_External_Note *e_note;

  bfd_size_type size;

  /* Pierre-Marie Baty -- this is only called if no .note section already exists

     in the input BFDs. So just create one in the first one of the list.

     And NORMALLY this doesn't break anything.  */

  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_HAS_CONTENTS

	   | SEC_IN_MEMORY | SEC_LINKER_CREATED);

  note_sec = bfd_make_section_anyway_with_flags (link_info.input_bfds, ".note", flags);

  if (! note_sec)

    {

      einfo (_("%F%P: failed to create .note section\n"));

      return NULL;

    }

  size = offsetof (Elf_External_Note, name[sizeof "QNX"]);

  size = (size + 3) & -(bfd_size_type) 4;

  size += sizeof (struct nto_stack_note);

  note_sec->size = size;

  elf_section_type (note_sec) = SHT_NOTE;

  note_sec->contents = xmalloc (note_sec->size);

  e_note = (Elf_External_Note *) note_sec->contents;

  bfd_h_put_32 (link_info.input_bfds, sizeof "QNX", &e_note->namesz);

  bfd_h_put_32 (link_info.input_bfds, sizeof (struct nto_stack_note), &e_note->descsz);

  bfd_h_put_32 (link_info.input_bfds, type, &e_note->type);

  memcpy (e_note->name, "QNX", sizeof "QNX");

  return note_sec;

}

/* Lookup for a section holding a QNX note or create a new section.  */

static asection*

nto_lookup_QNX_note_section(int type)

{

  asection *stack_note_sec = NULL;

  bfd *abfd;

  bool duplicated_notes_detected = false;

  for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)

    {

      Elf_External_Note *e_note;

      asection *sec;

      /* QNX notes are held under a note section simply named ".note".  */

      sec = bfd_get_section_by_name (abfd, ".note");

      if (!sec)

	continue;

      /* Verify that this is a QNX note of the expected type.  */

      sec->contents = xmalloc(sec->size);

      if (!bfd_get_section_contents (sec->owner, sec, sec->contents, (file_ptr) 0,

				     sec->size))

	einfo (_("%F%P: %pB: can't read contents of section .note: %E\n"),

	       sec->owner);

      e_note = (Elf_External_Note *) sec->contents;

      if (! strcmp("QNX", e_note->name) && *e_note->type == type)

	{

	  if (stack_note_sec)

	    {

	      if (!duplicated_notes_detected)

		{

		  einfo (_("%P: %pB: warning: duplicated QNX stack .note detected\n"),

			 stack_note_sec->owner);

		  duplicated_notes_detected = true;

		}

	      einfo (_("%P: %pB: warning: duplicated QNX stack .note detected\n"),

		     sec->owner);

	    }

	  else

	    {

	      stack_note_sec = sec;

	      /* Allow modification of this .note content.  */

	      stack_note_sec->flags |= SEC_IN_MEMORY;

	    }

	}

    }

  if (stack_note_sec)

    return stack_note_sec;

  else

    return nto_create_QNX_note_section(type);

}

/* Generate the QNX stack .note section.  */

static void

nto_add_note_section (void) {

  asection *note_sec;

  struct nto_stack_note *n_note;

  bfd_size_type h_size;

  bool is_update = false;

  if (nto_lazy_stack && !link_info.stacksize)

    {

      einfo (_("%F%P: error: --lazy-stack must follow -zstack-size=<size>\n"));

      return;

    }

  /* Don't create a note if none of the stack parameter have to be modified.  */

  if (link_info.stacksize <= 0 && (link_info.execstack == link_info.noexecstack))

    return;

  note_sec = nto_lookup_QNX_note_section(QNT_STACK);

  if (! note_sec)

    return;

  /* Update QNX stack note content.  */

  h_size = note_sec->size - sizeof(struct nto_stack_note);

  n_note = (struct nto_stack_note *) (note_sec->contents + h_size);

  is_update = note_sec->owner != NULL; /* Pierre-Marie Baty -- was comparing against a stub file's BFD, which doesn't exist in x86 */

  if (link_info.stacksize > 0)

    bfd_h_put_32 (note_sec->owner, link_info.stacksize, &n_note->stacksize);

  else if (!is_update)

    bfd_h_put_32 (note_sec->owner, 0, &n_note->stacksize);

  if (nto_lazy_stack || (!is_update && link_info.stacksize <= 0))

    bfd_h_put_32 (note_sec->owner, 4096, &n_note->stackalloc);

  else if (link_info.stacksize > 0)

    bfd_h_put_32 (note_sec->owner, link_info.stacksize, &n_note->stackalloc);

  if (link_info.execstack)

    bfd_h_put_32 (note_sec->owner, 0, &n_note->execstack);

  else if (!is_update || link_info.noexecstack)

    bfd_h_put_32 (note_sec->owner, 1, &n_note->execstack);

}

static void

nto_after_open (void)

{

  nto_add_note_section();

  gld${EMULATION_NAME}_after_open ();

}

EOF

else

	# Pierre-Marie Baty -- anything else (not i386 nor x86_64)

	. "${srcdir}/emultempl/${ARCH}elf.em"

	cat >>e${EMULATION_NAME}.c <<EOF

#include "elf/internal.h"

#include "elf/common.h"

#include "elf-bfd.h"

#include "../bfd/libbfd.h"

bool nto_lazy_stack = false;

struct nto_stack_note

{

  unsigned char stacksize[4];

  unsigned char stackalloc[4];

  unsigned char execstack[4];

};

static asection*

nto_create_QNX_note_section(int type)

{

  asection *note_sec;

  flagword flags;

  Elf_External_Note *e_note;

  bfd_size_type size;

  /* As ${ARCH}elf.em is imported and ${ARCH}_elf_create_output_section_statements

     is called before this function, stub_file should already be defined.  */

  if (!stub_file)

    {

      einfo (_("%F%P: cannot create .note section in stub BFD.\n"));

      return NULL;

    }

  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_HAS_CONTENTS

	   | SEC_IN_MEMORY | SEC_LINKER_CREATED);

  note_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, ".note", flags);

  if (! note_sec)

    {

      einfo (_("%F%P: failed to create .note section\n"));

      return NULL;

    }

  size = offsetof (Elf_External_Note, name[sizeof "QNX"]);

  size = (size + 3) & -(bfd_size_type) 4;

  size += sizeof (struct nto_stack_note);

  note_sec->size = size;

  elf_section_type (note_sec) = SHT_NOTE;

  note_sec->contents = xmalloc (note_sec->size);

  e_note = (Elf_External_Note *) note_sec->contents;

  bfd_h_put_32 (stub_file->the_bfd, sizeof "QNX", &e_note->namesz);

  bfd_h_put_32 (stub_file->the_bfd, sizeof (struct nto_stack_note), &e_note->descsz);

  bfd_h_put_32 (stub_file->the_bfd, type, &e_note->type);

  memcpy (e_note->name, "QNX", sizeof "QNX");

  return note_sec;

}

/* Lookup for a section holding a QNX note or create a new section.  */

static asection*

nto_lookup_QNX_note_section(int type)

{

  asection *stack_note_sec = NULL;

  bfd *abfd;

  bool duplicated_notes_detected = false;

  for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)

    {

      Elf_External_Note *e_note;

      asection *sec;

      /* QNX notes are held under a note section simply named ".note".  */

      sec = bfd_get_section_by_name (abfd, ".note");

      if (!sec)

	continue;

      /* Verify that this is a QNX note of the expected type.  */

      sec->contents = xmalloc(sec->size);

      if (!bfd_get_section_contents (sec->owner, sec, sec->contents, (file_ptr) 0,

				     sec->size))

	einfo (_("%F%P: %pB: can't read contents of section .note: %E\n"),

	       sec->owner);

      e_note = (Elf_External_Note *) sec->contents;

      if (! strcmp("QNX", e_note->name) && *e_note->type == type)

	{

	  if (stack_note_sec)

	    {

	      if (!duplicated_notes_detected)

		{

		  einfo (_("%P: %pB: warning: duplicated QNX stack .note detected\n"),

			 stack_note_sec->owner);

		  duplicated_notes_detected = true;

		}

	      einfo (_("%P: %pB: warning: duplicated QNX stack .note detected\n"),

		     sec->owner);

	    }

	  else

	    {

	      stack_note_sec = sec;

	      /* Allow modification of this .note content.  */

	      stack_note_sec->flags |= SEC_IN_MEMORY;

	    }

	}

    }

  if (stack_note_sec)

    return stack_note_sec;

  else

    return nto_create_QNX_note_section(type);

}

/* Generate the QNX stack .note section.  */

static void

nto_add_note_section (void) {

  asection *note_sec;

  struct nto_stack_note *n_note;

  bfd_size_type h_size;

  bool is_update = false;

  if (nto_lazy_stack && !link_info.stacksize)

    {

      einfo (_("%F%P: error: --lazy-stack must follow -zstack-size=<size>\n"));

      return;

    }

  /* Don't create a note if none of the stack parameter have to be modified.  */

  if (link_info.stacksize <= 0 && (link_info.execstack == link_info.noexecstack))

    return;

  note_sec = nto_lookup_QNX_note_section(QNT_STACK);

  if (! note_sec)

    return;

  /* Update QNX stack note content.  */

  h_size = note_sec->size - sizeof(struct nto_stack_note);

  n_note = (struct nto_stack_note *) (note_sec->contents + h_size);

  is_update = note_sec->owner != stub_file->the_bfd;

  if (link_info.stacksize > 0)

    bfd_h_put_32 (note_sec->owner, link_info.stacksize, &n_note->stacksize);

  else if (!is_update)

    bfd_h_put_32 (note_sec->owner, 0, &n_note->stacksize);

  if (nto_lazy_stack || (!is_update && link_info.stacksize <= 0))

    bfd_h_put_32 (note_sec->owner, 4096, &n_note->stackalloc);

  else if (link_info.stacksize > 0)

    bfd_h_put_32 (note_sec->owner, link_info.stacksize, &n_note->stackalloc);

  if (link_info.execstack)

    bfd_h_put_32 (note_sec->owner, 0, &n_note->execstack);

  else if (!is_update || link_info.noexecstack)

    bfd_h_put_32 (note_sec->owner, 1, &n_note->execstack);

}

static void

nto_after_open (void)

{

  nto_add_note_section();

  gld${EMULATION_NAME}_after_open ();

}

EOF

fi

# Define some shell vars to insert bits of code into the standard elf

# parse_args and list_options functions.

#

PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'

enum nto_options

{

  OPTION_STACK = 500,

  OPTION_LAZY_STACK,

};

'

PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'

  { "stack", required_argument, NULL, OPTION_STACK },

  { "lazy-stack", no_argument, NULL, OPTION_LAZY_STACK },

'

PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'

  fprintf (file, _("\

  --stack <size>              Set size of the initial stack\n\

  --lazy-stack		      Set lazy allocation of stack\n\

"));

'

PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'

    case OPTION_STACK:

      {

        char *end;

        link_info.stacksize = strtoul (optarg, &end, 0);

        if (*end || link_info.stacksize < 0)

          einfo (_("%F%P: invalid stack size `%s'\''\n"), optarg + 11);

        if (!link_info.stacksize)

          /* Use -1 for explicit no-stack, because zero means

             'default'.   */

          link_info.stacksize = -1;

        break;

      }

    case OPTION_LAZY_STACK:

      nto_lazy_stack = true;

      break;

'

# Put these extra Neutrino routines in ld_${EMULATION_NAME}_emulation

#

# Pierre-Marie Baty -- hook changed to accomodate this patch: https://inbox.sourceware.org/binutils/20231013080248.219837-1-chigot@adacore.com/T/#u

LDEMUL_AFTER_OPEN=nto_after_open