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/* S-record download support for GDB, the GNU debugger.

   Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004, 2007, 2008,

   2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "serial.h"

#include "srec.h"

#include <time.h>

#include "gdb_assert.h"

#include "gdb_string.h"

extern void report_transfer_performance (unsigned long, time_t, time_t);

extern int remote_debug;

static int make_srec (char *srec, CORE_ADDR targ_addr, bfd * abfd,

                      asection * sect, int sectoff, int *maxrecsize,

                      int flags);

/* Download an executable by converting it to S records.  DESC is a

   `struct serial *' to send the data to.  FILE is the name of the

   file to be loaded.  LOAD_OFFSET is the offset into memory to load

   data into.  It is usually specified by the user and is useful with

   the a.out file format.  MAXRECSIZE is the length in chars of the

   largest S-record the host can accomodate.  This is measured from

   the starting `S' to the last char of the checksum.  FLAGS is

   various random flags, and HASHMARK is non-zero to cause a `#' to be

   printed out for each record loaded.  WAITACK, if non-NULL, is a

   function that waits for an acknowledgement after each S-record, and

   returns non-zero if the ack is read correctly.  */

void

load_srec (struct serial *desc, const char *file, bfd_vma load_offset,

           int maxrecsize,

           int flags, int hashmark, int (*waitack) (void))

{

  bfd *abfd;

  asection *s;

  char *srec;

  int i;

  int reclen;

  time_t start_time, end_time;

  unsigned long data_count = 0;

  srec = (char *) alloca (maxrecsize + 1);

  abfd = bfd_openr (file, 0);

  if (!abfd)

    {

      printf_filtered (_("Unable to open file %s\n"), file);

      return;

    }

  if (bfd_check_format (abfd, bfd_object) == 0)

    {

      printf_filtered (_("File is not an object file\n"));

      return;

    }

  start_time = time (NULL);

  /* Write a type 0 header record. no data for a type 0, and there

     is no data, so len is 0.  */

  reclen = maxrecsize;

  make_srec (srec, 0, NULL, (asection *) 1, 0, &reclen, flags);

  if (remote_debug)

    {

      srec[reclen] = '\0';

      puts_debug ("sent -->", srec, "<--");

    }

  serial_write (desc, srec, reclen);

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

    if (s->flags & SEC_LOAD)

      {

        int numbytes;

        bfd_vma addr = bfd_get_section_vma (abfd, s) + load_offset;

        bfd_size_type size = bfd_get_section_size (s);

        char *section_name = (char *) bfd_get_section_name (abfd, s);

        /* Both GDB and BFD have mechanisms for printing addresses.

           In the below, GDB's is used so that the address is

           consistent with the rest of GDB.  BFD's printf_vma() could

           have also been used. cagney 1999-09-01 */

        printf_filtered ("%s\t: %s .. %s  ",

                         section_name,

                         paddress (target_gdbarch, addr),

                         paddress (target_gdbarch, addr + size));

        gdb_flush (gdb_stdout);

        data_count += size;

        for (i = 0; i < size; i += numbytes)

          {

            reclen = maxrecsize;

            numbytes = make_srec (srec, (CORE_ADDR) (addr + i), abfd, s,

                                  i, &reclen, flags);

            if (remote_debug)

              {

                srec[reclen] = '\0';

                puts_debug ("sent -->", srec, "<--");

              }

            /* Repeatedly send the S-record until a good

               acknowledgement is sent back.  */

            do

              {

                serial_write (desc, srec, reclen);

                if (deprecated_ui_load_progress_hook)

                  if (deprecated_ui_load_progress_hook (section_name,

                                                        (unsigned long) i))

                    error (_("Canceled the download"));

              }

            while (waitack != NULL && !waitack ());

            if (hashmark)

              {

                putchar_unfiltered ('#');

                gdb_flush (gdb_stdout);

              }

          }                     /* Per-packet (or S-record) loop */

        if (deprecated_ui_load_progress_hook)

          if (deprecated_ui_load_progress_hook (section_name,

                                                (unsigned long) i))

            error (_("Canceled the download"));

        putchar_unfiltered ('\n');

      }

  if (hashmark)

    putchar_unfiltered ('\n');

  end_time = time (NULL);

  /* Write a terminator record.  */

  reclen = maxrecsize;

  make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);

  if (remote_debug)

    {

      srec[reclen] = '\0';

      puts_debug ("sent -->", srec, "<--");

    }

  serial_write (desc, srec, reclen);

  /* Some monitors need these to wake up properly.  (Which ones? -sts)  */

  serial_write (desc, "\r\r", 2);

  if (remote_debug)

    puts_debug ("sent -->", "\r\r", "<---");

  serial_flush_input (desc);

  report_transfer_performance (data_count, start_time, end_time);

}

/*

 * make_srec -- make an srecord. This writes each line, one at a

 *      time, each with it's own header and trailer line.

 *      An srecord looks like this:

 *

 * byte count-+     address

 * start ---+ |        |       data        +- checksum

 *          | |        |                   |

 *        S01000006F6B692D746573742E73726563E4

 *        S315000448600000000000000000FC00005900000000E9

 *        S31A0004000023C1400037DE00F023604000377B009020825000348D

 *        S30B0004485A0000000000004E

 *        S70500040000F6

 *

 *      S<type><length><address><data><checksum>

 *

 *      Where

 *      - length

 *        is the number of bytes following upto the checksum. Note that

 *        this is not the number of chars following, since it takes two

 *        chars to represent a byte.

 *      - type

 *        is one of:

 *        0) header record

 *        1) two byte address data record

 *        2) three byte address data record

 *        3) four byte address data record

 *        7) four byte address termination record

 *        8) three byte address termination record

 *        9) two byte address termination record

 *

 *      - address

 *        is the start address of the data following, or in the case of

 *        a termination record, the start address of the image

 *      - data

 *        is the data.

 *      - checksum

 *        is the sum of all the raw byte data in the record, from the length

 *        upwards, modulo 256 and subtracted from 255.

 *

 * This routine returns the length of the S-record.

 *

 */

static int

make_srec (char *srec, CORE_ADDR targ_addr, bfd *abfd, asection *sect,

           int sectoff, int *maxrecsize, int flags)

{

  unsigned char checksum;

  int tmp;

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

  const static char data_code_table[] = "123";

  const static char term_code_table[] = "987";

  const static char header_code_table[] = "000";

  char const *code_table;

  int addr_size;

  int payload_size;

  char *binbuf;

  char *p;

  if (sect)

    {

      tmp = flags;              /* Data or header record */

      code_table = abfd ? data_code_table : header_code_table;

      binbuf = alloca (*maxrecsize / 2);

    }

  else

    {

      tmp = flags >> SREC_TERM_SHIFT;   /* Term record */

      code_table = term_code_table;

      binbuf = NULL;

    }

  if ((tmp & SREC_2_BYTE_ADDR) && (targ_addr <= 0xffff))

    addr_size = 2;

  else if ((tmp & SREC_3_BYTE_ADDR) && (targ_addr <= 0xffffff))

    addr_size = 3;

  else if (tmp & SREC_4_BYTE_ADDR)

    addr_size = 4;

  else

    internal_error (__FILE__, __LINE__,

                    _("make_srec:  Bad address (%s), or bad flags (0x%x)."),

                    paddress (target_gdbarch, targ_addr), flags);

  /* Now that we know the address size, we can figure out how much

     data this record can hold.  */

  if (sect && abfd)

    {

      payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;

      payload_size = min (payload_size, bfd_get_section_size (sect) - sectoff);

      bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);

    }

  else

    payload_size = 0;            /* Term or header packets have no payload */

  /* Output the header.  */

  snprintf (srec, (*maxrecsize) + 1, "S%c%02X%0*X",

            code_table[addr_size - 2],

            addr_size + payload_size + 1,

            addr_size * 2, (int) targ_addr);

  /* Note that the checksum is calculated on the raw data, not the

     hexified data.  It includes the length, address and the data

     portions of the packet.  */

  checksum = 0;

  checksum += (payload_size + addr_size + 1     /* Packet length */

               + (targ_addr & 0xff)     /* Address... */

               + ((targ_addr >> 8) & 0xff)

               + ((targ_addr >> 16) & 0xff)

               + ((targ_addr >> 24) & 0xff));

  /* NOTE: cagney/2003-08-10: The equation is old.  Check that the

     recent snprintf changes match that equation.  */

  gdb_assert (strlen (srec) == 1 + 1 + 2 + addr_size * 2);

  p = srec + 1 + 1 + 2 + addr_size * 2;

  /* Build the Srecord.  */

  for (tmp = 0; tmp < payload_size; tmp++)

    {

      unsigned char k;

      k = binbuf[tmp];

      *p++ = hextab[k >> 4];

      *p++ = hextab[k & 0xf];

      checksum += k;

    }

  checksum = ~checksum;

  *p++ = hextab[checksum >> 4];

  *p++ = hextab[checksum & 0xf];

  *p++ = '\r';

  *maxrecsize = p - srec;

  return payload_size;

}