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/* BFD backend for Extended Tektronix Hex Format  objects.

   Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,

   2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.

   Written by Steve Chamberlain of Cygnus Support <sac@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 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.  */

/* SUBSECTION

        Tektronix Hex Format handling

   DESCRIPTION

        Tek Hex records can hold symbols and data, but not

        relocations. Their main application is communication with

        devices like PROM programmers and ICE equipment.

        It seems that the sections are described as being really big,

        the example I have says that the text section is 0..ffffffff.

        BFD would barf with this, many apps would try to alloc 4GB to

        read in the file.

        Tex Hex may contain many sections, but the data which comes in

        has no tag saying which section it belongs to, so we create

        one section for each block of data, called "blknnnn" which we

        stick all the data into.

        TekHex may come out of  order and there is no header, so an

        initial scan is required  to discover the minimum and maximum

        addresses used to create the vma and size of the sections we

        create.

        We read in the data into pages of CHUNK_MASK+1 size and read

        them out from that whenever we need to.

        Any number of sections may be created for output, we save them

        up and output them when it's time to close the bfd.

        A TekHex record looks like:

  EXAMPLE

        %<block length><type><checksum><stuff><cr>

  DESCRIPTION

        Where

        o length

        is the number of bytes in the record not including the % sign.

        o type

        is one of:

        3) symbol record

        6) data record

        8) termination record

  The data can come out of order, and may be discontigous. This is a

  serial protocol, so big files are unlikely, so we keep a list of 8k chunks.  */

#include "sysdep.h"

#include "bfd.h"

#include "libbfd.h"

#include "libiberty.h"

typedef struct

{

  bfd_vma low;

  bfd_vma high;

} addr_range_type;

typedef struct tekhex_symbol_struct

{

  asymbol symbol;

  struct tekhex_symbol_struct *prev;

} tekhex_symbol_type;

static const char digs[] = "0123456789ABCDEF";

static char sum_block[256];

#define NOT_HEX      20

#define NIBBLE(x)    hex_value(x)

#define HEX(buffer) ((NIBBLE ((buffer)[0]) << 4) + NIBBLE ((buffer)[1]))

#define ISHEX(x)    hex_p(x)

#define TOHEX(d, x) \

  (d)[1] = digs[(x) & 0xf]; \

  (d)[0] = digs[((x)>>4)&0xf];

/* Here's an example

   %3A6C6480004E56FFFC4E717063B0AEFFFC6D0652AEFFFC60F24E5E4E75

   %1B3709T_SEGMENT1108FFFFFFFF

   %2B3AB9T_SEGMENT7Dgcc_compiled$1087hello$c10

   %373829T_SEGMENT80int$t1$r1$$214741080char$t2$r2$0$12710

   %373769T_SEGMENT80long$int$t3$r1$$1080unsigned$int$t4$10

   %373CA9T_SEGMENT80long$unsigned$in1080short$int$t6$r1$10

   %373049T_SEGMENT80long$long$int$t71080short$unsigned$i10

   %373A29T_SEGMENT80long$long$unsign1080signed$char$t10$10

   %373D69T_SEGMENT80unsigned$char$t11080float$t12$r1$4$010

   %373D19T_SEGMENT80double$t13$r1$8$1080long$double$t14$10

   %2734D9T_SEGMENT8Bvoid$t15$151035_main10

   %2F3CA9T_SEGMENT81$1081$1681$1E81$21487main$F110

   %2832F9T_SEGMENT83i$18FFFFFFFC81$1481$214

   %07 8 10 10

   explanation:

   %3A6C6480004E56FFFC4E717063B0AEFFFC6D0652AEFFFC60F24E5E4E75

    ^ ^^ ^     ^-data

    | || +------ 4 char integer 0x8000

    | |+-------- checksum

    | +--------- type 6 (data record)

    +----------- length 3a chars

   <---------------------- 3a (58 chars) ------------------->

   %1B3709T_SEGMENT1108FFFFFFFF

         ^         ^^ ^- 8 character integer 0xffffffff

         |         |+-   1 character integer 0

         |         +--   type 1 symbol (section definition)

         +------------   9 char symbol T_SEGMENT

   %2B3AB9T_SEGMENT7Dgcc_compiled$1087hello$c10

   %373829T_SEGMENT80int$t1$r1$$214741080char$t2$r2$0$12710

   %373769T_SEGMENT80long$int$t3$r1$$1080unsigned$int$t4$10

   %373CA9T_SEGMENT80long$unsigned$in1080short$int$t6$r1$10

   %373049T_SEGMENT80long$long$int$t71080short$unsigned$i10

   %373A29T_SEGMENT80long$long$unsign1080signed$char$t10$10

   %373D69T_SEGMENT80unsigned$char$t11080float$t12$r1$4$010

   %373D19T_SEGMENT80double$t13$r1$8$1080long$double$t14$10

   %2734D9T_SEGMENT8Bvoid$t15$151035_main10

   %2F3CA9T_SEGMENT81$1081$1681$1E81$21487main$F110

   %2832F9T_SEGMENT83i$18FFFFFFFC81$1481$214

   %0781010

   Turns into

   sac@thepub$ ./objdump -dx -m m68k f

   f:     file format tekhex

   -----x--- 9/55728 -134219416 Sep 29 15:13 1995 f

   architecture: UNKNOWN!, flags 0x00000010:

   HAS_SYMS

   start address 0x00000000

   SECTION 0 [D00000000]        : size 00020000 vma 00000000 align 2**0

   ALLOC, LOAD

   SECTION 1 [D00008000]        : size 00002001 vma 00008000 align 2**0

   SECTION 2 [T_SEGMENT]        : size ffffffff vma 00000000 align 2**0

   SYMBOL TABLE:

   00000000  g       T_SEGMENT gcc_compiled$

   00000000  g       T_SEGMENT hello$c

   00000000  g       T_SEGMENT int$t1$r1$$21474

   00000000  g       T_SEGMENT char$t2$r2$0$127

   00000000  g       T_SEGMENT long$int$t3$r1$$

   00000000  g       T_SEGMENT unsigned$int$t4$

   00000000  g       T_SEGMENT long$unsigned$in

   00000000  g       T_SEGMENT short$int$t6$r1$

   00000000  g       T_SEGMENT long$long$int$t7

   00000000  g       T_SEGMENT short$unsigned$i

   00000000  g       T_SEGMENT long$long$unsign

   00000000  g       T_SEGMENT signed$char$t10$

   00000000  g       T_SEGMENT unsigned$char$t1

   00000000  g       T_SEGMENT float$t12$r1$4$0

   00000000  g       T_SEGMENT double$t13$r1$8$

   00000000  g       T_SEGMENT long$double$t14$

   00000000  g       T_SEGMENT void$t15$15

   00000000  g       T_SEGMENT _main

   00000000  g       T_SEGMENT $

   00000000  g       T_SEGMENT $

   00000000  g       T_SEGMENT $

   00000010  g       T_SEGMENT $

   00000000  g       T_SEGMENT main$F1

   fcffffff  g       T_SEGMENT i$1

   00000000  g       T_SEGMENT $

   00000010  g       T_SEGMENT $

   RELOCATION RECORDS FOR [D00000000]: (none)

   RELOCATION RECORDS FOR [D00008000]: (none)

   RELOCATION RECORDS FOR [T_SEGMENT]: (none)

   Disassembly of section D00000000:

   ...

   00008000 ($+)7ff0 linkw fp,#-4

   00008004 ($+)7ff4 nop

   00008006 ($+)7ff6 movel #99,d0

   00008008 ($+)7ff8 cmpl fp@(-4),d0

   0000800c ($+)7ffc blts 00008014 ($+)8004

   0000800e ($+)7ffe addql #1,fp@(-4)

   00008012 ($+)8002 bras 00008006 ($+)7ff6

   00008014 ($+)8004 unlk fp

   00008016 ($+)8006 rts

   ...  */

static void

tekhex_init (void)

{

  unsigned int i;

  static bfd_boolean inited = FALSE;

  int val;

  if (! inited)

    {

      inited = TRUE;

      hex_init ();

      val = 0;

      for (i = 0; i < 10; i++)

        sum_block[i + '0'] = val++;

      for (i = 'A'; i <= 'Z'; i++)

        sum_block[i] = val++;

      sum_block['$'] = val++;

      sum_block['%'] = val++;

      sum_block['.'] = val++;

      sum_block['_'] = val++;

      for (i = 'a'; i <= 'z'; i++)

        sum_block[i] = val++;

    }

}

/* The maximum number of bytes on a line is FF.  */

#define MAXCHUNK 0xff

/* The number of bytes we fit onto a line on output.  */

#define CHUNK 21

/* We cannot output our tekhexords as we see them, we have to glue them

   together, this is done in this structure : */

struct tekhex_data_list_struct

{

  unsigned char *data;

  bfd_vma where;

  bfd_size_type size;

  struct tekhex_data_list_struct *next;

};

typedef struct tekhex_data_list_struct tekhex_data_list_type;

#define CHUNK_MASK 0x1fff

struct data_struct

{

  char chunk_data[CHUNK_MASK + 1];

  char chunk_init[CHUNK_MASK + 1];

  bfd_vma vma;

  struct data_struct *next;

};

typedef struct tekhex_data_struct

{

  tekhex_data_list_type *head;

  unsigned int type;

  struct tekhex_symbol_struct *symbols;

  struct data_struct *data;

} tdata_type;

#define enda(x) (x->vma + x->size)

static bfd_boolean

getvalue (char **srcp, bfd_vma *valuep)

{

  char *src = *srcp;

  bfd_vma value = 0;

  unsigned int len;

  if (!ISHEX (*src))

    return FALSE;

  len = hex_value (*src++);

  if (len == 0)

    len = 16;

  while (len--)

    {

      if (!ISHEX (*src))

        return FALSE;

      value = value << 4 | hex_value (*src++);

    }

  *srcp = src;

  *valuep = value;

  return TRUE;

}

static bfd_boolean

getsym (char *dstp, char **srcp, unsigned int *lenp)

{

  char *src = *srcp;

  unsigned int i;

  unsigned int len;

  if (!ISHEX (*src))

    return FALSE;

  len = hex_value (*src++);

  if (len == 0)

    len = 16;

  for (i = 0; i < len; i++)

    dstp[i] = src[i];

  dstp[i] = 0;

  *srcp = src + i;

  *lenp = len;

  return TRUE;

}

static struct data_struct *

find_chunk (bfd *abfd, bfd_vma vma)

{

  struct data_struct *d = abfd->tdata.tekhex_data->data;

  vma &= ~CHUNK_MASK;

  while (d && (d->vma) != vma)

    d = d->next;

  if (!d)

    {

      /* No chunk for this address, so make one up.  */

      d = (struct data_struct *)

          bfd_zalloc (abfd, (bfd_size_type) sizeof (struct data_struct));

      if (!d)

        return NULL;

      d->next = abfd->tdata.tekhex_data->data;

      d->vma = vma;

      abfd->tdata.tekhex_data->data = d;

    }

  return d;

}

static void

insert_byte (bfd *abfd, int value, bfd_vma addr)

{

  /* Find the chunk that this byte needs and put it in.  */

  struct data_struct *d = find_chunk (abfd, addr);

  d->chunk_data[addr & CHUNK_MASK] = value;

  d->chunk_init[addr & CHUNK_MASK] = 1;

}

/* The first pass is to find the names of all the sections, and see

  how big the data is.  */

static bfd_boolean

first_phase (bfd *abfd, int type, char *src)

{

  asection *section = bfd_abs_section_ptr;

  unsigned int len;

  bfd_vma val;

  char sym[17];                 /* A symbol can only be 16chars long.  */

  switch (type)

    {

    case '6':

      /* Data record - read it and store it.  */

      {

        bfd_vma addr;

        if (!getvalue (&src, &addr))

          return FALSE;

        while (*src)

          {

            insert_byte (abfd, HEX (src), addr);

            src += 2;

            addr++;

          }

      }

      return TRUE;

    case '3':

      /* Symbol record, read the segment.  */

      if (!getsym (sym, &src, &len))

        return FALSE;

      section = bfd_get_section_by_name (abfd, sym);

      if (section == NULL)

        {

          char *n = (char *) bfd_alloc (abfd, (bfd_size_type) len + 1);

          if (!n)

            return FALSE;

          memcpy (n, sym, len + 1);

          section = bfd_make_section (abfd, n);

          if (section == NULL)

            return FALSE;

        }

      while (*src)

        {

          switch (*src)

            {

            case '1':           /* Section range.  */

              src++;

              if (!getvalue (&src, &section->vma))

                return FALSE;

              if (!getvalue (&src, &val))

                return FALSE;

              section->size = val - section->vma;

              section->flags = SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC;

              break;

            case '0':

            case '2':

            case '3':

            case '4':

            case '6':

            case '7':

            case '8':

              /* Symbols, add to section.  */

              {

                bfd_size_type amt = sizeof (tekhex_symbol_type);

                tekhex_symbol_type *new_symbol = (tekhex_symbol_type *)

                    bfd_alloc (abfd, amt);

                char stype = (*src);

                if (!new_symbol)

                  return FALSE;

                new_symbol->symbol.the_bfd = abfd;

                src++;

                abfd->symcount++;

                abfd->flags |= HAS_SYMS;

                new_symbol->prev = abfd->tdata.tekhex_data->symbols;

                abfd->tdata.tekhex_data->symbols = new_symbol;

                if (!getsym (sym, &src, &len))

                  return FALSE;

                new_symbol->symbol.name = (const char *)

                    bfd_alloc (abfd, (bfd_size_type) len + 1);

                if (!new_symbol->symbol.name)

                  return FALSE;

                memcpy ((char *) (new_symbol->symbol.name), sym, len + 1);

                new_symbol->symbol.section = section;

                if (stype <= '4')

                  new_symbol->symbol.flags = (BSF_GLOBAL | BSF_EXPORT);

                else

                  new_symbol->symbol.flags = BSF_LOCAL;

                if (!getvalue (&src, &val))

                  return FALSE;

                new_symbol->symbol.value = val - section->vma;

                break;

              }

            default:

              return FALSE;

            }

        }

    }

  return TRUE;

}

/* Pass over a tekhex, calling one of the above functions on each

   record.  */

static bfd_boolean

pass_over (bfd *abfd, bfd_boolean (*func) (bfd *, int, char *))

{

  unsigned int chars_on_line;

  bfd_boolean eof = FALSE;

  /* To the front of the file.  */

  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)

    return FALSE;

  while (! eof)

    {

      char src[MAXCHUNK];

      char type;

      /* Find first '%'.  */

      eof = (bfd_boolean) (bfd_bread (src, (bfd_size_type) 1, abfd) != 1);

      while (*src != '%' && !eof)

        eof = (bfd_boolean) (bfd_bread (src, (bfd_size_type) 1, abfd) != 1);

      if (eof)

        break;

      /* Fetch the type and the length and the checksum.  */

      if (bfd_bread (src, (bfd_size_type) 5, abfd) != 5)

        return FALSE;

      type = src[2];

      if (!ISHEX (src[0]) || !ISHEX (src[1]))

        break;

      /* Already read five chars.  */

      chars_on_line = HEX (src) - 5;

      if (chars_on_line >= MAXCHUNK)

        return FALSE;

      if (bfd_bread (src, (bfd_size_type) chars_on_line, abfd) != chars_on_line)

        return FALSE;

      /* Put a null at the end.  */

      src[chars_on_line] = 0;

      if (!func (abfd, type, src))

        return FALSE;

    }

  return TRUE;

}

static long

tekhex_canonicalize_symtab (bfd *abfd, asymbol **table)

{

  tekhex_symbol_type *p = abfd->tdata.tekhex_data->symbols;

  unsigned int c = bfd_get_symcount (abfd);

  table[c] = 0;

  while (p)

    {

      table[--c] = &(p->symbol);

      p = p->prev;

    }

  return bfd_get_symcount (abfd);

}

static long

tekhex_get_symtab_upper_bound (bfd *abfd)

{

  return (abfd->symcount + 1) * (sizeof (struct tekhex_asymbol_struct *));

}

static bfd_boolean

tekhex_mkobject (bfd *abfd)

{

  tdata_type *tdata;

  tdata = (tdata_type *) bfd_alloc (abfd, (bfd_size_type) sizeof (tdata_type));

  if (!tdata)

    return FALSE;

  abfd->tdata.tekhex_data = tdata;

  tdata->type = 1;

  tdata->head =  NULL;

  tdata->symbols = NULL;

  tdata->data = NULL;

  return TRUE;

}

/* Return TRUE if the file looks like it's in TekHex format. Just look

   for a percent sign and some hex digits.  */

static const bfd_target *

tekhex_object_p (bfd *abfd)

{

  char b[4];

  tekhex_init ();

  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0

      || bfd_bread (b, (bfd_size_type) 4, abfd) != 4)

    return NULL;

  if (b[0] != '%' || !ISHEX (b[1]) || !ISHEX (b[2]) || !ISHEX (b[3]))

    return NULL;

  tekhex_mkobject (abfd);

  if (!pass_over (abfd, first_phase))

    return NULL;

  return abfd->xvec;

}

static void

move_section_contents (bfd *abfd,

                       asection *section,

                       const void * locationp,

                       file_ptr offset,

                       bfd_size_type count,

                       bfd_boolean get)

{

  bfd_vma addr;

  char *location = (char *) locationp;

  bfd_vma prev_number = 1;      /* Nothing can have this as a high bit.  */

  struct data_struct *d = NULL;

  BFD_ASSERT (offset == 0);

  for (addr = section->vma; count != 0; count--, addr++)

    {

      /* Get high bits of address.  */

      bfd_vma chunk_number = addr & ~(bfd_vma) CHUNK_MASK;

      bfd_vma low_bits = addr & CHUNK_MASK;

      if (chunk_number != prev_number)

        /* Different chunk, so move pointer. */

        d = find_chunk (abfd, chunk_number);

      if (get)

        {

          if (d->chunk_init[low_bits])

            *location = d->chunk_data[low_bits];

          else

            *location = 0;

        }

      else

        {

          d->chunk_data[low_bits] = *location;

          d->chunk_init[low_bits] = (*location != 0);

        }

      location++;

    }

}

static bfd_boolean

tekhex_get_section_contents (bfd *abfd,

                             asection *section,

                             void * locationp,

                             file_ptr offset,

                             bfd_size_type count)

{

  if (section->flags & (SEC_LOAD | SEC_ALLOC))

    {

      move_section_contents (abfd, section, locationp, offset, count, TRUE);

      return TRUE;

    }

  return FALSE;

}

static bfd_boolean

tekhex_set_arch_mach (bfd *abfd,

                      enum bfd_architecture arch,

                      unsigned long machine)

{

  return bfd_default_set_arch_mach (abfd, arch, machine);

}

/* We have to save up all the Tekhexords for a splurge before output.  */

static bfd_boolean

tekhex_set_section_contents (bfd *abfd,

                             sec_ptr section,

                             const void * locationp,

                             file_ptr offset,

                             bfd_size_type bytes_to_do)

{

  if (! abfd->output_has_begun)

    {

      /* The first time around, allocate enough sections to hold all the chunks.  */

      asection *s = abfd->sections;

      bfd_vma vma;

      for (s = abfd->sections; s; s = s->next)

        {

          if (s->flags & SEC_LOAD)

            {

              for (vma = s->vma & ~(bfd_vma) CHUNK_MASK;

                   vma < s->vma + s->size;

                   vma += CHUNK_MASK)

                find_chunk (abfd, vma);

            }

        }

    }

  if (section->flags & (SEC_LOAD | SEC_ALLOC))

    {

      move_section_contents (abfd, section, locationp, offset, bytes_to_do,

                             FALSE);

      return TRUE;

    }

  return FALSE;

}

static void

writevalue (char **dst, bfd_vma value)

{

  char *p = *dst;

  int len;

  int shift;

  for (len = 8, shift = 28; shift; shift -= 4, len--)

    {

      if ((value >> shift) & 0xf)

        {

          *p++ = len + '0';

          while (len)

            {

              *p++ = digs[(value >> shift) & 0xf];

              shift -= 4;

              len--;

            }

          *dst = p;

          return;

        }

    }

  *p++ = '1';

  *p++ = '0';

  *dst = p;

}

static void

writesym (char **dst, const char *sym)

{

  char *p = *dst;

  int len = (sym ? strlen (sym) : 0);