gdb/dsrec.c

   1 /* S-record download support for GDB, the GNU debugger.
   2    Copyright 1995, 1996, 1997, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "serial.h"
  24 #include "srec.h"
  25 #include <time.h>
  26
  27 extern void report_transfer_performance (unsigned long, time_t, time_t);
  28
  29 extern int remote_debug;
  30
  31 static int make_srec (char *srec, CORE_ADDR targ_addr, bfd * abfd,
  32                       asection * sect, int sectoff, int *maxrecsize,
  33                       int flags);
  34
  35 /* Download an executable by converting it to S records.  DESC is a
  36    `struct serial *' to send the data to.  FILE is the name of the
  37    file to be loaded.  LOAD_OFFSET is the offset into memory to load
  38    data into.  It is usually specified by the user and is useful with
  39    the a.out file format.  MAXRECSIZE is the length in chars of the
  40    largest S-record the host can accomodate.  This is measured from
  41    the starting `S' to the last char of the checksum.  FLAGS is
  42    various random flags, and HASHMARK is non-zero to cause a `#' to be
  43    printed out for each record loaded.  WAITACK, if non-NULL, is a
  44    function that waits for an acknowledgement after each S-record, and
  45    returns non-zero if the ack is read correctly.  */
  46
  47 void
  48 load_srec (struct serial *desc, const char *file, bfd_vma load_offset,
  49            int maxrecsize,
  50            int flags, int hashmark, int (*waitack) (void))
  51 {
  52   bfd *abfd;
  53   asection *s;
  54   char *srec;
  55   int i;
  56   int reclen;
  57   time_t start_time, end_time;
  58   unsigned long data_count = 0;
  59
  60   srec = (char *) alloca (maxrecsize + 1);
  61
  62   abfd = bfd_openr (file, 0);
  63   if (!abfd)
  64     {
  65       printf_filtered ("Unable to open file %s\n", file);
  66       return;
  67     }
  68
  69   if (bfd_check_format (abfd, bfd_object) == 0)
  70     {
  71       printf_filtered ("File is not an object file\n");
  72       return;
  73     }
  74
  75   start_time = time (NULL);
  76
  77   /* Write a type 0 header record. no data for a type 0, and there
  78      is no data, so len is 0.  */
  79
  80   reclen = maxrecsize;
  81   make_srec (srec, 0, NULL, (asection *) 1, 0, &reclen, flags);
  82   if (remote_debug)
  83     {
  84       srec[reclen] = '\0';
  85       puts_debug ("sent -->", srec, "<--");
  86     }
  87   serial_write (desc, srec, reclen);
  88
  89   for (s = abfd->sections; s; s = s->next)
  90     if (s->flags & SEC_LOAD)
  91       {
  92         int numbytes;
  93         bfd_vma addr = bfd_get_section_vma (abfd, s) + load_offset;
  94         bfd_size_type size = bfd_get_section_size_before_reloc (s);
  95         char *section_name = (char *) bfd_get_section_name (abfd, s);
  96         /* Both GDB and BFD have mechanisms for printing addresses.
  97            In the below, GDB's is used so that the address is
  98            consistent with the rest of GDB.  BFD's printf_vma() could
  99            have also been used. cagney 1999-09-01 */
 100         printf_filtered ("%s\t: 0x%s .. 0x%s  ",
 101                          section_name,
 102                          paddr (addr),
 103                          paddr (addr + size));
 104         gdb_flush (gdb_stdout);
 105
 106         data_count += size;
 107
 108         for (i = 0; i < size; i += numbytes)
 109           {
 110             reclen = maxrecsize;
 111             numbytes = make_srec (srec, (CORE_ADDR) (addr + i), abfd, s,
 112                                   i, &reclen, flags);
 113
 114             if (remote_debug)
 115               {
 116                 srec[reclen] = '\0';
 117                 puts_debug ("sent -->", srec, "<--");
 118               }
 119
 120             /* Repeatedly send the S-record until a good
 121                acknowledgement is sent back.  */
 122             do
 123               {
 124                 serial_write (desc, srec, reclen);
 125                 if (ui_load_progress_hook)
 126                   if (ui_load_progress_hook (section_name, (unsigned long) i))
 127                     error ("Canceled the download");
 128               }
 129             while (waitack != NULL && !waitack ());
 130
 131             if (hashmark)
 132               {
 133                 putchar_unfiltered ('#');
 134                 gdb_flush (gdb_stdout);
 135               }
 136           }                     /* Per-packet (or S-record) loop */
 137
 138         if (ui_load_progress_hook)
 139           if (ui_load_progress_hook (section_name, (unsigned long) i))
 140             error ("Canceled the download");
 141         putchar_unfiltered ('\n');
 142       }
 143
 144   if (hashmark)
 145     putchar_unfiltered ('\n');
 146
 147   end_time = time (NULL);
 148
 149   /* Write a terminator record.  */
 150
 151   reclen = maxrecsize;
 152   make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);
 153
 154   if (remote_debug)
 155     {
 156       srec[reclen] = '\0';
 157       puts_debug ("sent -->", srec, "<--");
 158     }
 159
 160   serial_write (desc, srec, reclen);
 161
 162   /* Some monitors need these to wake up properly.  (Which ones? -sts)  */
 163   serial_write (desc, "\r\r", 2);
 164   if (remote_debug)
 165     puts_debug ("sent -->", "\r\r", "<---");
 166
 167   serial_flush_input (desc);
 168
 169   report_transfer_performance (data_count, start_time, end_time);
 170 }
 171
 172 /*
 173  * make_srec -- make an srecord. This writes each line, one at a
 174  *      time, each with it's own header and trailer line.
 175  *      An srecord looks like this:
 176  *
 177  * byte count-+     address
 178  * start ---+ |        |       data        +- checksum
 179  *          | |        |                   |
 180  *        S01000006F6B692D746573742E73726563E4
 181  *        S315000448600000000000000000FC00005900000000E9
 182  *        S31A0004000023C1400037DE00F023604000377B009020825000348D
 183  *        S30B0004485A0000000000004E
 184  *        S70500040000F6
 185  *
 186  *      S<type><length><address><data><checksum>
 187  *
 188  *      Where
 189  *      - length
 190  *        is the number of bytes following upto the checksum. Note that
 191  *        this is not the number of chars following, since it takes two
 192  *        chars to represent a byte.
 193  *      - type
 194  *        is one of:
 195  *        0) header record
 196  *        1) two byte address data record
 197  *        2) three byte address data record
 198  *        3) four byte address data record
 199  *        7) four byte address termination record
 200  *        8) three byte address termination record
 201  *        9) two byte address termination record
 202  *
 203  *      - address
 204  *        is the start address of the data following, or in the case of
 205  *        a termination record, the start address of the image
 206  *      - data
 207  *        is the data.
 208  *      - checksum
 209  *        is the sum of all the raw byte data in the record, from the length
 210  *        upwards, modulo 256 and subtracted from 255.
 211  *
 212  * This routine returns the length of the S-record.
 213  *
 214  */
 215
 216 static int
 217 make_srec (char *srec, CORE_ADDR targ_addr, bfd *abfd, asection *sect,
 218            int sectoff, int *maxrecsize, int flags)
 219 {
 220   unsigned char checksum;
 221   int tmp;
 222   const static char hextab[] = "0123456789ABCDEF";
 223   const static char data_code_table[] = "123";
 224   const static char term_code_table[] = "987";
 225   const static char header_code_table[] = "000";
 226   const static char *formats[] =
 227   {"S%c%02X%04X",
 228    "S%c%02X%06X",
 229    "S%c%02X%08X"};
 230   char const *code_table;
 231   int addr_size;
 232   int payload_size;
 233   char *binbuf;
 234   char *p;
 235
 236   if (sect)
 237     {
 238       tmp = flags;              /* Data or header record */
 239       code_table = abfd ? data_code_table : header_code_table;
 240       binbuf = alloca (*maxrecsize / 2);
 241     }
 242   else
 243     {
 244       tmp = flags >> SREC_TERM_SHIFT;   /* Term record */
 245       code_table = term_code_table;
 246       binbuf = NULL;
 247     }
 248
 249   if ((tmp & SREC_2_BYTE_ADDR) && (targ_addr <= 0xffff))
 250     addr_size = 2;
 251   else if ((tmp & SREC_3_BYTE_ADDR) && (targ_addr <= 0xffffff))
 252     addr_size = 3;
 253   else if (tmp & SREC_4_BYTE_ADDR)
 254     addr_size = 4;
 255   else
 256     internal_error (__FILE__, __LINE__,
 257                     "make_srec:  Bad address (0x%s), or bad flags (0x%x).",
 258                     paddr (targ_addr), flags);
 259
 260   /* Now that we know the address size, we can figure out how much
 261      data this record can hold.  */
 262
 263   if (sect && abfd)
 264     {
 265       payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;
 266       payload_size = min (payload_size, sect->_raw_size - sectoff);
 267
 268       bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);
 269     }
 270   else
 271     payload_size = 0;           /* Term or header packets have no payload */
 272
 273   /* Output the header.  */
 274
 275   sprintf (srec, formats[addr_size - 2], code_table[addr_size - 2],
 276            addr_size + payload_size + 1, (int) targ_addr);
 277
 278   /* Note that the checksum is calculated on the raw data, not the
 279      hexified data.  It includes the length, address and the data
 280      portions of the packet.  */
 281
 282   checksum = 0;
 283
 284   checksum += (payload_size + addr_size + 1     /* Packet length */
 285                + (targ_addr & 0xff)     /* Address... */
 286                + ((targ_addr >> 8) & 0xff)
 287                + ((targ_addr >> 16) & 0xff)
 288                + ((targ_addr >> 24) & 0xff));
 289
 290   p = srec + 1 + 1 + 2 + addr_size * 2;
 291
 292   /* Build the Srecord.  */
 293   for (tmp = 0; tmp < payload_size; tmp++)
 294     {
 295       unsigned char k;
 296
 297       k = binbuf[tmp];
 298       *p++ = hextab[k >> 4];
 299       *p++ = hextab[k & 0xf];
 300       checksum += k;
 301     }
 302
 303   checksum = ~checksum;
 304
 305   *p++ = hextab[checksum >> 4];
 306   *p++ = hextab[checksum & 0xf];
 307   *p++ = '\r';
 308
 309   *maxrecsize = p - srec;
 310   return payload_size;
 311 }