Initial revision

1 files changed, 1041 insertions, 0 deletions

diff --git a/bfd/ihex.c b/bfd/ihex.c
new file mode 100644
index 0000000000..b9953d329f
--- /dev/null
+++ b/bfd/ihex.c
@@ -0,0 +1,1041 @@
+/* BFD back-end for Intel Hex objects.
+   Copyright 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor of Cygnus Support <ian@cygnus.com>.
+
+This file is part of BFD, the Binary File Descriptor library.
+
+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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* This is what Intel Hex files look like:
+
+1. INTEL FORMATS
+
+A. Intel 1
+
+   16-bit address-field format, for files 64k bytes in length or less.
+
+   DATA RECORD
+   Byte 1	Header = colon(:)
+   2..3		The number of data bytes in hex notation
+   4..5		High byte of the record load address
+   6..7		Low byte of the record load address
+   8..9		Record type, must be "00"
+   10..x	Data bytes in hex notation:
+	x = (number of bytes - 1) * 2 + 11
+   x+1..x+2	Checksum in hex notation
+   x+3..x+4	Carriage return, line feed
+
+   END RECORD
+   Byte 1	Header = colon (:)
+   2..3		The byte count, must be "00"
+   4..7		Transfer-address (usually "0000")
+		the jump-to address, execution start address
+   8..9		Record type, must be "01"
+   10..11	Checksum, in hex notation
+   12..13	Carriage return, line feed
+
+B. INTEL 2
+
+   MCS-86 format, using a 20-bit address for files larger than 64K bytes.
+
+   DATA RECORD
+   Byte 1	Header = colon (:)
+   2..3		The byte count of this record, hex notation
+   4..5		High byte of the record load address
+   6..7		Low byte of the record load address
+   8..9		Record type, must be "00"
+   10..x	The data bytes in hex notation:
+	x = (number of data bytes - 1) * 2 + 11
+   x+1..x+2	Checksum in hex notation
+   x+3..x+4	Carriage return, line feed
+
+   EXTENDED ADDRESS RECORD
+   Byte 1	Header = colon(:)
+   2..3		The byte count, must be "02"
+   4..7		Load address, must be "0000"
+   8..9		Record type, must be "02"
+   10..11	High byte of the offset address
+   12..13	Low byte of the offset address
+   14..15	Checksum in hex notation
+   16..17	Carriage return, line feed
+
+   The checksums are the two's complement of the 8-bit sum
+   without carry of the byte count, offset address, and the
+   record type.
+
+   START ADDRESS RECORD
+   Byte 1	Header = colon (:)
+   2..3		The byte count, must be "04"
+   4..7		Load address, must be "0000"
+   8..9		Record type, must be "03"
+   10..13	8086 CS value
+   14..17	8086 IP value
+   18..19	Checksum in hex notation
+   20..21	Carriage return, line feed
+
+Another document reports these additional types:
+
+   EXTENDED LINEAR ADDRESS RECORD
+   Byte 1	Header = colon (:)
+   2..3		The byte count, must be "02"
+   4..7		Load address, must be "0000"
+   8..9		Record type, must be "04"
+   10..13	Upper 16 bits of address of subsequent records
+   14..15	Checksum in hex notation
+   16..17	Carriage return, line feed
+
+   START LINEAR ADDRESS RECORD
+   Byte 1	Header = colon (:)
+   2..3		The byte count, must be "02"
+   4..7		Load address, must be "0000"
+   8..9		Record type, must be "05"
+   10..13	Upper 16 bits of start address
+   14..15	Checksum in hex notation
+   16..17	Carriage return, line feed
+
+The MRI compiler uses this, which is a repeat of type 5:
+
+  EXTENDED START RECORD
+   Byte 1	Header = colon (:)
+   2..3		The byte count, must be "04"
+   4..7		Load address, must be "0000"
+   8..9		Record type, must be "05"
+   10..13	Upper 16 bits of start address
+   14..17	Lower 16 bits of start address
+   18..19	Checksum in hex notation
+   20..21	Carriage return, line feed
+*/
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "libiberty.h"
+
+#include <ctype.h>
+
+static void ihex_init PARAMS ((void));
+static boolean ihex_mkobject PARAMS ((bfd *));
+static INLINE int ihex_get_byte PARAMS ((bfd *, boolean *));
+static void ihex_bad_byte PARAMS ((bfd *, unsigned int, int, boolean));
+static boolean ihex_scan PARAMS ((bfd *));
+static const bfd_target *ihex_object_p PARAMS ((bfd *));
+static boolean ihex_read_section PARAMS ((bfd *, asection *, bfd_byte *));
+static boolean ihex_get_section_contents
+  PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
+static boolean ihex_set_section_contents
+  PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
+static boolean ihex_write_record
+  PARAMS ((bfd *, bfd_size_type, bfd_vma, unsigned int, bfd_byte *));
+static boolean ihex_write_object_contents PARAMS ((bfd *));
+static asymbol *ihex_make_empty_symbol PARAMS ((bfd *));
+static boolean ihex_set_arch_mach
+  PARAMS ((bfd *, enum bfd_architecture, unsigned long));
+static int ihex_sizeof_headers PARAMS ((bfd *, boolean));
+
+/* The number of bytes we put on one line during output.  */
+
+#define CHUNK (21)
+
+/* Macros for converting between hex and binary. */
+
+#define NIBBLE(x) (hex_value (x))
+#define HEX2(buffer) ((NIBBLE ((buffer)[0]) << 4) + NIBBLE ((buffer)[1]))
+#define HEX4(buffer) ((HEX2 (buffer) << 8) + HEX2 ((buffer) + 2))
+#define ISHEX(x) (hex_p (x))
+
+/* When we write out an ihex value, the values can not be output as
+   they are seen.  Instead, we hold them in memory in this structure.  */
+
+struct ihex_data_list
+{
+  struct ihex_data_list *next;
+  bfd_byte *data;
+  bfd_vma where;
+  bfd_size_type size;
+};
+
+/* The ihex tdata information.  */
+
+struct ihex_data_struct
+{
+  struct ihex_data_list *head;
+  struct ihex_data_list *tail;
+};
+
+/* Initialize by filling in the hex conversion array.  */
+
+static void
+ihex_init ()
+{
+  static boolean inited;
+
+  if (! inited)
+    {
+      inited = true;
+      hex_init ();
+    }
+}
+
+/* Create an ihex object.  */
+
+static boolean
+ihex_mkobject (abfd)
+     bfd *abfd;
+{
+  if (abfd->tdata.ihex_data == NULL)
+    {
+      struct ihex_data_struct *tdata;
+
+      tdata = ((struct ihex_data_struct *)
+	       bfd_alloc (abfd, sizeof (struct ihex_data_struct)));
+      if (tdata == NULL)
+	return false;
+      abfd->tdata.ihex_data = tdata;
+      tdata->head = NULL;
+      tdata->tail = NULL;
+    }
+
+  return true;
+}
+
+/* Read a byte from a BFD.  Set *ERRORPTR if an error occurred.
+   Return EOF on error or end of file.  */
+
+static INLINE int
+ihex_get_byte (abfd, errorptr)
+     bfd *abfd;
+     boolean *errorptr;
+{
+  bfd_byte c;
+
+  if (bfd_read (&c, 1, 1, abfd) != 1)
+    {
+      if (bfd_get_error () != bfd_error_file_truncated)
+	*errorptr = true;
+      return EOF;
+    }
+
+  return (int) (c & 0xff);
+}
+
+/* Report a problem in an Intel Hex file.  */
+
+static void
+ihex_bad_byte (abfd, lineno, c, error)
+     bfd *abfd;
+     unsigned int lineno;
+     int c;
+     boolean error;
+{
+  if (c == EOF)
+    {
+      if (! error)
+	bfd_set_error (bfd_error_file_truncated);
+    }
+  else
+    {
+      char buf[10];
+
+      if (! isprint (c))
+	sprintf (buf, "\\%03o", (unsigned int) c);
+      else
+	{
+	  buf[0] = c;
+	  buf[1] = '\0';
+	}
+      (*_bfd_error_handler)
+	(_("%s:%d: unexpected character `%s' in Intel Hex file\n"),
+	 bfd_get_filename (abfd), lineno, buf);
+      bfd_set_error (bfd_error_bad_value);
+    }
+}
+
+/* Read an Intel hex file and turn it into sections.  We create a new
+   section for each contiguous set of bytes.  */
+
+static boolean
+ihex_scan (abfd)
+     bfd *abfd;
+{
+  bfd_vma segbase;
+  bfd_vma extbase;
+  asection *sec;
+  int lineno;
+  boolean error;
+  bfd_byte *buf = NULL;
+  size_t bufsize;
+  int c;
+
+  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
+    goto error_return;
+
+  abfd->start_address = 0;
+
+  segbase = 0;
+  extbase = 0;
+  sec = NULL;
+  lineno = 1;
+  error = false;
+  bufsize = 0;
+  while ((c = ihex_get_byte (abfd, &error)) != EOF)
+    {
+      if (c == '\r')
+	continue;
+      else if (c == '\n')
+	{
+	  ++lineno;
+	  continue;
+	}
+      else if (c != ':')
+	{
+	  ihex_bad_byte (abfd, lineno, c, error);
+	  goto error_return;
+	}
+      else
+	{
+	  file_ptr pos;
+	  char hdr[8];
+	  unsigned int i;
+	  unsigned int len;
+	  bfd_vma addr;
+	  unsigned int type;
+	  unsigned int chars;
+	  unsigned int chksum;
+
+	  /* This is a data record.  */
+
+	  pos = bfd_tell (abfd) - 1;
+
+	  /* Read the header bytes.  */
+
+	  if (bfd_read (hdr, 1, 8, abfd) != 8)
+	    goto error_return;
+
+	  for (i = 0; i < 8; i++)
+	    {
+	      if (! ISHEX (hdr[i]))
+		{
+		  ihex_bad_byte (abfd, lineno, hdr[i], error);
+		  goto error_return;
+		}
+	    }
+
+	  len = HEX2 (hdr);
+	  addr = HEX4 (hdr + 2);
+	  type = HEX2 (hdr + 6);
+
+	  /* Read the data bytes.  */
+
+	  chars = len * 2 + 2;
+	  if (chars >= bufsize)
+	    {
+	      buf = (bfd_byte *) bfd_realloc (buf, chars);
+	      if (buf == NULL)
+		goto error_return;
+	      bufsize = chars;
+	    }
+
+	  if (bfd_read (buf, 1, chars, abfd) != chars)
+	    goto error_return;
+
+	  for (i = 0; i < chars; i++)
+	    {
+	      if (! ISHEX (buf[i]))
+		{
+		  ihex_bad_byte (abfd, lineno, hdr[i], error);
+		  goto error_return;
+		}
+	    }
+
+	  /* Check the checksum.  */
+	  chksum = len + addr + (addr >> 8) + type;
+	  for (i = 0; i < len; i++)
+	    chksum += HEX2 (buf + 2 * i);
+	  if (((- chksum) & 0xff) != (unsigned int) HEX2 (buf + 2 * i))
+	    {
+	      (*_bfd_error_handler)
+		(_("%s:%d: bad checksum in Intel Hex file (expected %u, found %u)"),
+		 bfd_get_filename (abfd), lineno,
+		 (- chksum) & 0xff, (unsigned int) HEX2 (buf + 2 * i));
+	      bfd_set_error (bfd_error_bad_value);
+	      goto error_return;
+	    }
+
+	  switch (type)
+	    {
+	    case 0:
+	      /* This is a data record.  */
+	      if (sec != NULL
+		  && sec->vma + sec->_raw_size == extbase + segbase + addr)
+		{
+		  /* This data goes at the end of the section we are
+                     currently building.  */
+		  sec->_raw_size += len;
+		}
+	      else if (len > 0)
+		{
+		  char secbuf[20];
+		  char *secname;
+
+		  sprintf (secbuf, ".sec%d", bfd_count_sections (abfd) + 1);
+		  secname = (char *) bfd_alloc (abfd, strlen (secbuf) + 1);
+		  if (secname == NULL)
+		    goto error_return;
+		  strcpy (secname, secbuf);
+		  sec = bfd_make_section (abfd, secname);
+		  if (sec == NULL)
+		    goto error_return;
+		  sec->flags = SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC;
+		  sec->vma = extbase + segbase + addr;
+		  sec->lma = extbase + segbase + addr;
+		  sec->_raw_size = len;
+		  sec->filepos = pos;
+		}
+	      break;
+
+	    case 1:
+	      /* An end record.  */
+	      if (abfd->start_address == 0)
+		abfd->start_address = addr;
+	      if (buf != NULL)
+		free (buf);
+	      return true;
+
+	    case 2:
+	      /* An extended address record.  */
+	      if (len != 2)
+		{
+		  (*_bfd_error_handler)
+		    (_("%s:%d: bad extended address record length in Intel Hex file"),
+		     bfd_get_filename (abfd), lineno);
+		  bfd_set_error (bfd_error_bad_value);
+		  goto error_return;
+		}
+
+	      segbase = HEX4 (buf) << 4;
+
+	      sec = NULL;
+
+	      break;
+
+	    case 3:
+	      /* An extended start address record.  */
+	      if (len != 4)
+		{
+		  (*_bfd_error_handler)
+		    (_("%s:%d: bad extended start address length in Intel Hex file"),
+		     bfd_get_filename (abfd), lineno);
+		  bfd_set_error (bfd_error_bad_value);
+		  goto error_return;
+		}
+
+	      abfd->start_address += (HEX4 (buf) << 4) + HEX4 (buf + 4);
+
+	      sec = NULL;
+
+	      break;
+
+	    case 4:
+	      /* An extended linear address record.  */
+	      if (len != 2)
+		{
+		  (*_bfd_error_handler)
+		    (_("%s:%d: bad extended linear address record length in Intel Hex file"),
+		     bfd_get_filename (abfd), lineno);
+		  bfd_set_error (bfd_error_bad_value);
+		  goto error_return;
+		}
+
+	      extbase = HEX4 (buf) << 16;
+
+	      sec = NULL;
+
+	      break;
+
+	    case 5:
+	      /* An extended linear start address record.  */
+	      if (len != 2 && len != 4)
+		{
+		  (*_bfd_error_handler)
+		    (_("%s:%d: bad extended linear start address length in Intel Hex file"),
+		     bfd_get_filename (abfd), lineno);
+		  bfd_set_error (bfd_error_bad_value);
+		  goto error_return;
+		}
+
+	      if (len == 2)
+		abfd->start_address += HEX4 (buf) << 16;
+	      else
+		abfd->start_address = (HEX4 (buf) << 16) + HEX4 (buf + 4);
+
+	      sec = NULL;
+
+	      break;
+
+	    default:
+	      (*_bfd_error_handler)
+		(_("%s:%d: unrecognized ihex type %u in Intel Hex file\n"),
+		 bfd_get_filename (abfd), lineno, type);
+	      bfd_set_error (bfd_error_bad_value);
+	      goto error_return;
+	    }
+	}
+    }
+
+  if (error)
+    goto error_return;
+
+  if (buf != NULL)
+    free (buf);
+
+  return true;
+
+ error_return:
+  if (buf != NULL)
+    free (buf);
+  return false;
+}
+
+/* Try to recognize an Intel Hex file.  */
+
+static const bfd_target *
+ihex_object_p (abfd)
+     bfd *abfd;
+{
+  bfd_byte b[9];
+  unsigned int i;
+  unsigned int type;
+
+  ihex_init ();
+
+  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
+    return NULL;
+  if (bfd_read (b, 1, 9, abfd) != 9)
+    {
+      if (bfd_get_error () == bfd_error_file_truncated)
+	bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+
+  if (b[0] != ':')
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+
+  for (i = 1; i < 9; i++)
+    {
+      if (! ISHEX (b[i]))
+	{
+	  bfd_set_error (bfd_error_wrong_format);
+	  return NULL;
+	}
+    }
+
+  type = HEX2 (b + 7);
+  if (type > 5)
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+
+  /* OK, it looks like it really is an Intel Hex file.  */
+
+  if (! ihex_mkobject (abfd)
+      || ! ihex_scan (abfd))
+    return NULL;
+
+  return abfd->xvec;
+}
+
+/* Read the contents of a section in an Intel Hex file.  */
+
+static boolean
+ihex_read_section (abfd, section, contents)
+     bfd *abfd;
+     asection *section;
+     bfd_byte *contents;
+{
+  int c;
+  bfd_byte *p;
+  bfd_byte *buf = NULL;
+  size_t bufsize;
+  boolean error;
+
+  if (bfd_seek (abfd, section->filepos, SEEK_SET) != 0)
+    goto error_return;
+
+  p = contents;
+  bufsize = 0;
+  error = false;
+  while ((c = ihex_get_byte (abfd, &error)) != EOF)
+    {
+      char hdr[8];
+      unsigned int len;
+      bfd_vma addr;
+      unsigned int type;
+      unsigned int i;
+
+      if (c == '\r' || c == '\n')
+	continue;
+
+      /* This is called after ihex_scan has succeeded, so we ought to
+         know the exact format.  */
+      BFD_ASSERT (c == ':');
+
+      if (bfd_read (hdr, 1, 8, abfd) != 8)
+	goto error_return;
+
+      len = HEX2 (hdr);
+      addr = HEX4 (hdr + 2);
+      type = HEX2 (hdr + 6);
+
+      /* We should only see type 0 records here.  */
+      if (type != 0)
+	{
+	  (*_bfd_error_handler)
+	    (_("%s: internal error in ihex_read_section"),
+	     bfd_get_filename (abfd));
+	  bfd_set_error (bfd_error_bad_value);
+	  goto error_return;
+	}
+
+      if (len * 2 > bufsize)
+	{
+	  buf = (bfd_byte *) bfd_realloc (buf, len * 2);
+	  if (buf == NULL)
+	    goto error_return;
+	  bufsize = len * 2;
+	}
+
+      if (bfd_read (buf, 1, len * 2, abfd) != len * 2)
+	goto error_return;
+
+      for (i = 0; i < len; i++)
+	*p++ = HEX2 (buf + 2 * i);
+      if ((bfd_size_type) (p - contents) >= section->_raw_size)
+	{
+	  /* We've read everything in the section.  */
+	  if (buf != NULL)
+	    free (buf);
+	  return true;
+	}
+
+      /* Skip the checksum.  */
+      if (bfd_read (buf, 1, 2, abfd) != 2)
+	goto error_return;
+    }
+
+  if ((bfd_size_type) (p - contents) < section->_raw_size)
+    {
+      (*_bfd_error_handler)
+	(_("%s: bad section length in ihex_read_section"),
+	 bfd_get_filename (abfd));
+      bfd_set_error (bfd_error_bad_value);
+      goto error_return;
+    }
+
+  if (buf != NULL)
+    free (buf);
+
+  return true;
+
+ error_return:
+  if (buf != NULL)
+    free (buf);
+  return false;
+}
+
+/* Get the contents of a section in an Intel Hex file.  */
+
+static boolean
+ihex_get_section_contents (abfd, section, location, offset, count)
+     bfd *abfd;
+     asection *section;
+     PTR location;
+     file_ptr offset;
+     bfd_size_type count;
+{
+  if (section->used_by_bfd == NULL)
+    {
+      section->used_by_bfd = bfd_alloc (abfd, section->_raw_size);
+      if (section->used_by_bfd == NULL)
+	return false;
+      if (! ihex_read_section (abfd, section, section->used_by_bfd))
+	return false;
+    }
+
+  memcpy (location, (bfd_byte *) section->used_by_bfd + offset,
+	  (size_t) count);
+
+  return true;
+}
+
+/* Set the contents of a section in an Intel Hex file.  */
+
+static boolean
+ihex_set_section_contents (abfd, section, location, offset, count)
+     bfd *abfd;
+     asection *section;
+     PTR location;
+     file_ptr offset;
+     bfd_size_type count;
+{
+  struct ihex_data_list *n;
+  bfd_byte *data;
+  struct ihex_data_struct *tdata;
+
+  if (count == 0
+      || (section->flags & SEC_ALLOC) == 0
+      || (section->flags & SEC_LOAD) == 0)
+    return true;
+
+  n = ((struct ihex_data_list *)
+       bfd_alloc (abfd, sizeof (struct ihex_data_list)));
+  if (n == NULL)
+    return false;
+
+  data = (bfd_byte *) bfd_alloc (abfd, count);
+  if (data == NULL)
+    return false;
+  memcpy (data, location, (size_t) count);
+
+  n->data = data;
+  n->where = section->lma + offset;
+  n->size = count;
+
+  /* Sort the records by address.  Optimize for the common case of
+     adding a record to the end of the list.  */
+  tdata = abfd->tdata.ihex_data;
+  if (tdata->tail != NULL
+      && n->where >= tdata->tail->where)
+    {
+      tdata->tail->next = n;
+      n->next = NULL;
+      tdata->tail = n;
+    }
+  else
+    {
+      register struct ihex_data_list **pp;
+
+      for (pp = &tdata->head;
+	   *pp != NULL && (*pp)->where < n->where;
+	   pp = &(*pp)->next)
+	;
+      n->next = *pp;
+      *pp = n;
+      if (n->next == NULL)
+	tdata->tail = n;
+    }
+
+  return true;
+}
+
+/* Write a record out to an Intel Hex file.  */
+
+static boolean
+ihex_write_record (abfd, count, addr, type, data)
+     bfd *abfd;
+     bfd_size_type count;
+     bfd_vma addr;
+     unsigned int type;
+     bfd_byte *data;
+{
+  static const char digs[] = "0123456789ABCDEF";
+  char buf[9 + CHUNK * 2 + 4];
+  char *p;
+  unsigned int chksum;
+  unsigned int i;
+
+#define TOHEX(buf, v) \
+  ((buf)[0] = digs[((v) >> 4) & 0xf], (buf)[1] = digs[(v) & 0xf])
+
+  buf[0] = ':';
+  TOHEX (buf + 1, count);
+  TOHEX (buf + 3, (addr >> 8) & 0xff);
+  TOHEX (buf + 5, addr & 0xff);
+  TOHEX (buf + 7, type);
+
+  chksum = count + addr + (addr >> 8) + type;
+
+  for (i = 0, p = buf + 9; i < count; i++, p += 2, data++)
+    {
+      TOHEX (p, *data);
+      chksum += *data;
+    }
+
+  TOHEX (p, (- chksum) & 0xff);
+  p[2] = '\r';
+  p[3] = '\n';
+
+  if (bfd_write (buf, 1, 9 + count * 2 + 4, abfd) != 9 + count * 2 + 4)
+    return false;
+
+  return true;
+}
+
+/* Write out an Intel Hex file.  */
+
+static boolean
+ihex_write_object_contents (abfd)
+     bfd *abfd;
+{
+  bfd_vma segbase;
+  bfd_vma extbase;
+  struct ihex_data_list *l;
+
+  segbase = 0;
+  extbase = 0;
+  for (l = abfd->tdata.ihex_data->head; l != NULL; l = l->next)
+    {
+      bfd_vma where;
+      bfd_byte *p;
+      bfd_size_type count;
+
+      where = l->where;
+      p = l->data;
+      count = l->size;
+      while (count > 0)
+	{
+	  bfd_size_type now;
+
+	  now = count;
+	  if (now > CHUNK)
+	    now = CHUNK;
+
+	  if (where > segbase + extbase + 0xffff)
+	    {
+	      bfd_byte addr[2];
+
+	      /* We need a new base address.  */
+	      if (where <= 0xfffff)
+		{
+		  /* The addresses should be sorted.  */
+		  BFD_ASSERT (extbase == 0);
+
+		  segbase = where & 0xf0000;
+		  addr[0] = (bfd_byte)(segbase >> 12) & 0xff;
+		  addr[1] = (bfd_byte)(segbase >> 4) & 0xff;
+		  if (! ihex_write_record (abfd, 2, 0, 2, addr))
+		    return false;
+		}
+	      else
+		{
+		  /* The extended address record and the extended
+                     linear address record are combined, at least by
+                     some readers.  We need an extended linear address
+                     record here, so if we've already written out an
+                     extended address record, zero it out to avoid
+                     confusion.  */
+		  if (segbase != 0)
+		    {
+		      addr[0] = 0;
+		      addr[1] = 0;
+		      if (! ihex_write_record (abfd, 2, 0, 2, addr))
+			return false;
+		      segbase = 0;
+		    }
+
+		  extbase = where & 0xffff0000;
+		  if (where > extbase + 0xffff)
+		    {
+		      char buf[20];
+
+		      sprintf_vma (buf, where);
+		      (*_bfd_error_handler)
+			(_("%s: address 0x%s out of range for Intex Hex file"),
+			 bfd_get_filename (abfd), buf);
+		      bfd_set_error (bfd_error_bad_value);
+		      return false;
+		    }
+		  addr[0] = (bfd_byte)(extbase >> 24) & 0xff;
+		  addr[1] = (bfd_byte)(extbase >> 16) & 0xff;
+		  if (! ihex_write_record (abfd, 2, 0, 4, addr))
+		    return false;
+		}
+	    }
+
+	  if (! ihex_write_record (abfd, now, where - (extbase + segbase),
+				   0, p))
+	    return false;
+
+	  where += now;
+	  p += now;
+	  count -= now;
+	}
+    }
+
+  if (abfd->start_address != 0)
+    {
+      bfd_vma start;
+      bfd_byte startbuf[4];
+
+      start = abfd->start_address;
+
+      if (start <= 0xfffff)
+	{
+	  startbuf[0] = (bfd_byte)((start & 0xf0000) >> 12) & 0xff;
+	  startbuf[1] = 0;
+	  startbuf[2] = (bfd_byte)(start >> 8) & 0xff;
+	  startbuf[3] = (bfd_byte)start & 0xff;
+	  if (! ihex_write_record (abfd, 4, 0, 3, startbuf))
+	    return false;
+	}
+      else
+	{
+	  startbuf[0] = (bfd_byte)(start >> 24) & 0xff;
+	  startbuf[1] = (bfd_byte)(start >> 16) & 0xff;
+	  startbuf[2] = (bfd_byte)(start >> 8) & 0xff;
+	  startbuf[3] = (bfd_byte)start & 0xff;
+	  if (! ihex_write_record (abfd, 4, 0, 5, startbuf))
+	    return false;
+	}
+    }
+
+  if (! ihex_write_record (abfd, 0, 0, 1, NULL))
+    return false;
+
+  return true;
+}
+
+/* Make an empty symbol.  This is required only because
+   bfd_make_section_anyway wants to create a symbol for the section.  */
+
+static asymbol *
+ihex_make_empty_symbol (abfd)
+     bfd *abfd;
+{
+  asymbol *new;
+
+  new = (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
+  if (new != NULL)
+    new->the_bfd = abfd;
+  return new;
+}
+
+/* Set the architecture for the output file.  The architecture is
+   irrelevant, so we ignore errors about unknown architectures.  */
+
+static boolean
+ihex_set_arch_mach (abfd, arch, mach)
+     bfd *abfd;
+     enum bfd_architecture arch;
+     unsigned long mach;
+{
+  if (! bfd_default_set_arch_mach (abfd, arch, mach))
+    {
+      if (arch != bfd_arch_unknown)
+	return false;
+    }
+  return true;
+}
+
+/* Get the size of the headers, for the linker.  */
+
+/*ARGSUSED*/
+static int
+ihex_sizeof_headers (abfd, exec)
+     bfd *abfd;
+     boolean exec;
+{
+  return 0;
+}
+
+/* Some random definitions for the target vector.  */
+
+#define	ihex_close_and_cleanup _bfd_generic_close_and_cleanup
+#define ihex_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
+#define ihex_new_section_hook _bfd_generic_new_section_hook
+#define ihex_get_section_contents_in_window \
+  _bfd_generic_get_section_contents_in_window
+
+#define ihex_get_symtab_upper_bound bfd_0l
+#define ihex_get_symtab \
+  ((long (*) PARAMS ((bfd *, asymbol **))) bfd_0l)
+#define ihex_print_symbol _bfd_nosymbols_print_symbol
+#define ihex_get_symbol_info _bfd_nosymbols_get_symbol_info
+#define ihex_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
+#define ihex_get_lineno _bfd_nosymbols_get_lineno
+#define ihex_find_nearest_line _bfd_nosymbols_find_nearest_line
+#define ihex_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
+#define ihex_read_minisymbols _bfd_nosymbols_read_minisymbols
+#define ihex_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
+
+#define ihex_get_reloc_upper_bound \
+  ((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
+#define ihex_canonicalize_reloc \
+  ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
+#define ihex_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
+
+#define ihex_bfd_get_relocated_section_contents \
+  bfd_generic_get_relocated_section_contents
+#define ihex_bfd_relax_section bfd_generic_relax_section
+#define ihex_bfd_gc_sections bfd_generic_gc_sections
+#define ihex_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
+#define ihex_bfd_link_add_symbols _bfd_generic_link_add_symbols
+#define ihex_bfd_final_link _bfd_generic_final_link
+#define ihex_bfd_link_split_section _bfd_generic_link_split_section
+
+/* The Intel Hex target vector.  */
+
+const bfd_target ihex_vec =
+{
+  "ihex",			/* name */
+  bfd_target_ihex_flavour,
+  BFD_ENDIAN_UNKNOWN,		/* target byte order */
+  BFD_ENDIAN_UNKNOWN,		/* target headers byte order */
+  0,				/* object flags */
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),	/* section flags */
+  0,				/* leading underscore */
+  ' ',				/* ar_pad_char */
+  16,				/* ar_max_namelen */
+  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
+  bfd_getb32, bfd_getb_signed_32, bfd_putb32,
+  bfd_getb16, bfd_getb_signed_16, bfd_putb16,	/* data */
+  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
+  bfd_getb32, bfd_getb_signed_32, bfd_putb32,
+  bfd_getb16, bfd_getb_signed_16, bfd_putb16,	/* hdrs */
+
+  {
+    _bfd_dummy_target,
+    ihex_object_p,		/* bfd_check_format */
+    _bfd_dummy_target,
+    _bfd_dummy_target,
+  },
+  {
+    bfd_false,
+    ihex_mkobject,
+    _bfd_generic_mkarchive,
+    bfd_false,
+  },
+  {				/* bfd_write_contents */
+    bfd_false,
+    ihex_write_object_contents,
+    _bfd_write_archive_contents,
+    bfd_false,
+  },
+
+  BFD_JUMP_TABLE_GENERIC (ihex),
+  BFD_JUMP_TABLE_COPY (_bfd_generic),
+  BFD_JUMP_TABLE_CORE (_bfd_nocore),
+  BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
+  BFD_JUMP_TABLE_SYMBOLS (ihex),
+  BFD_JUMP_TABLE_RELOCS (ihex),
+  BFD_JUMP_TABLE_WRITE (ihex),
+  BFD_JUMP_TABLE_LINK (ihex),
+  BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
+
+  (PTR) 0
+};