binutils-gdb/ld/emultempl/msp430.em

# This shell script emits a C file. -*- C -*-
# It does some substitutions.
fragment <<EOF
/* This file is is generated by a shell script.  DO NOT EDIT! */

/* Emulate the original gld for the given ${EMULATION_NAME}
   Copyright (C) 2014-2015 Free Software Foundation, Inc.
   Written by Steve Chamberlain steve@cygnus.com
   Extended for the MSP430 by Nick Clifton  nickc@redhat.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.  */

#define TARGET_IS_${EMULATION_NAME}

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"

#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldfile.h"
#include "ldemul.h"
#include "libiberty.h"

EOF

# Import any needed special functions and/or overrides.
#
if test -n "$EXTRA_EM_FILE" ; then
  source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
fi

if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
fragment <<EOF

static void
gld${EMULATION_NAME}_before_parse (void)
{
#ifndef TARGET_			/* I.e., if not generic.  */
  ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
#endif /* not TARGET_ */

  /* The MSP430 port *needs* linker relaxtion in order to cope with large
     functions where conditional branches do not fit into a +/- 1024 byte range.  */
  if (!bfd_link_relocatable (&link_info))
    TARGET_ENABLE_RELAXATION;
}

EOF
fi

if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
fragment <<EOF

static char *
gld${EMULATION_NAME}_get_script (int *isfile)
EOF

if test x"$COMPILE_IN" = xyes
then
# Scripts compiled in.

# sed commands to quote an ld script as a C string.
sc="-f stringify.sed"

fragment <<EOF
{
  *isfile = 0;

  if (bfd_link_relocatable (&link_info) && config.build_constructors)
    return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
echo '  ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
echo '  ; else return'                                 >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
echo '; }'                                             >> e${EMULATION_NAME}.c

else
# Scripts read from the filesystem.

fragment <<EOF
{
  *isfile = 1;

  if (bfd_link_relocatable (&link_info) && config.build_constructors)
    return "ldscripts/${EMULATION_NAME}.xu";
  else if (bfd_link_relocatable (&link_info))
    return "ldscripts/${EMULATION_NAME}.xr";
  else if (!config.text_read_only)
    return "ldscripts/${EMULATION_NAME}.xbn";
  else if (!config.magic_demand_paged)
    return "ldscripts/${EMULATION_NAME}.xn";
  else
    return "ldscripts/${EMULATION_NAME}.x";
}
EOF
fi
fi

if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
fragment <<EOF

/* Helper function for place_orphan that computes the size
   of sections already mapped to the given statement.  */

static bfd_size_type
scan_children (lang_statement_union_type * l)
{
  bfd_size_type amount = 0;

  while (l != NULL)
    {
      switch (l->header.type)
	{
	case lang_input_section_enum:
	  if (l->input_section.section->flags & SEC_ALLOC)
	    amount += l->input_section.section->size;
	  break;

	case lang_constructors_statement_enum:
	case lang_assignment_statement_enum:
	  break;

	case lang_wild_statement_enum:
	  amount += scan_children (l->wild_statement.children.head);	  
	  break;

	default:
	  fprintf (stderr, "msp430 orphan placer: unhandled lang type %d\n", l->header.type);
	  break;
	}

      l = l->header.next;
    }

  return amount;
}
  
/* Place an orphan section.  We use this to put .either sections
   into either their lower or their upper equivalents.  */

static lang_output_section_statement_type *
gld${EMULATION_NAME}_place_orphan (asection * s,
				   const char * secname,
				   int constraint)
{
  char * lower_name;
  char * upper_name;
  char * name;
  lang_output_section_statement_type * lower;
  lang_output_section_statement_type * upper;
  lang_output_section_statement_type * os;

  if ((s->flags & SEC_ALLOC) == 0)
    return NULL;

  if (bfd_link_relocatable (&link_info))
    return NULL;

  /* If constraints are involved let the linker handle the placement normally.  */
  if (constraint != 0)
    return NULL;

  /* We only need special handling for .either sections.  */
  if (strncmp (secname, ".either.", 8) != 0)
    return NULL;

  /* Skip the .either prefix.  */
  secname += 7;

  /* Compute the names of the corresponding upper and lower
     sections.  If the input section name contains another period,
     only use the part of the name before the second dot.  */
  if (strchr (secname + 1, '.') != NULL)
    {
      name = ACONCAT ((secname, NULL));

      * strchr (name + 1, '.') = 0;
    }
  else
    name = (char *) secname;
  
  lower_name = ACONCAT ((".lower", name, NULL));
  upper_name = ACONCAT ((".upper", name, NULL));

  /* Find the corresponding lower and upper sections.  */
  lower = lang_output_section_find (lower_name);
  upper = lang_output_section_find (upper_name);
  /* If the upper section does not exist, try again without the suffix.  */
  if (upper == NULL)
    upper = lang_output_section_find (name);

  if (lower == NULL)
    {
      os = upper;
      if (upper == NULL)
        {
          einfo ("%P: error: no section named %s or %s in linker script\n", lower_name, upper_name);
	  return NULL;
	}
    }
  else if (upper == NULL)
    os = lower;
  else if (lower->region == NULL)
    os = lower;
  /* If the section is too big for the region containing
     the lower section then do not even try to use it.  */
  else if (lower->region->length < s->size)
    os = upper;
  else
    {
      bfd_size_type amount = 0;
      struct lang_output_section_statement_struct * p;

      amount += scan_children (lower->children.head);

      /* Also check forwards for other statements assigned to the same region.  */
      for (p = lower->next; p != NULL; p = p->next)
	if (p->region == lower->region)
	  amount += scan_children (p->children.head);

      /* Scan backwards as well.  */      
      for (p = lower->prev; p != NULL; p = p->prev)
	if (p->region == lower->region)
	  amount += scan_children (p->children.head);

      if (amount + s->size >= lower->region->length)
	os = upper;
      else
	os = lower;
    }

  lang_add_section (& os->children, s, NULL, os);
  return os;
}
EOF
fi

fragment <<EOF

struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
{
  ${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
  ${LDEMUL_SYSLIB-syslib_default},
  ${LDEMUL_HLL-hll_default},
  ${LDEMUL_AFTER_PARSE-after_parse_default},
  ${LDEMUL_AFTER_OPEN-after_open_default},
  ${LDEMUL_AFTER_ALLOCATION-after_allocation_default},
  ${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
  ${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
  ${LDEMUL_BEFORE_ALLOCATION-before_allocation_default},
  ${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
  "${EMULATION_NAME}",
  "${OUTPUT_FORMAT}",
  ${LDEMUL_FINISH-finish_default},
  ${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
  ${LDEMUL_OPEN_DYNAMIC_ARCHIVE-NULL},
  ${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
  ${LDEMUL_SET_SYMBOLS-NULL},
  ${LDEMUL_PARSE_ARGS-NULL},
  ${LDEMUL_ADD_OPTIONS-NULL},
  ${LDEMUL_HANDLE_OPTION-NULL},
  ${LDEMUL_UNRECOGNIZED_FILE-NULL},
  ${LDEMUL_LIST_OPTIONS-NULL},
  ${LDEMUL_RECOGNIZED_FILE-NULL},
  ${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
  ${LDEMUL_NEW_VERS_PATTERN-NULL},
  ${LDEMUL_EXTRA_MAP_FILE_TEXT-NULL}
};
EOF
# 
# Local Variables:
# mode: c
# End: