gdb/dsrec.c

   1 /* S-record download support for GDB, the GNU debugger.
   2    Copyright 1995, 1996, 1997 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "serial.h"
  23 #include "srec.h"
  24 #include <time.h>
  25
  26 extern void report_transfer_performance (unsigned long, time_t, time_t);
  27
  28 extern int remote_debug;
  29
  30 static int make_srec (char *srec, CORE_ADDR targ_addr, bfd * abfd,
  31                       asection * sect, int sectoff, int *maxrecsize,
  32                       int flags);
  33
  34 /* Download an executable by converting it to S records.  DESC is a
  35    serial_t to send the data to.  FILE is the name of the file to be
  36    loaded.  LOAD_OFFSET is the offset into memory to load data into.
  37    It is usually specified by the user and is useful with the a.out
  38    file format.  MAXRECSIZE is the length in chars of the largest
  39    S-record the host can accomodate.  This is measured from the
  40    starting `S' to the last char of the checksum.  FLAGS is various
  41    random flags, and HASHMARK is non-zero to cause a `#' to be
  42    printed out for each record loaded.  WAITACK, if non-NULL, is a
  43    function that waits for an acknowledgement after each S-record,
  44    and returns non-zero if the ack is read correctly.  */
  45
  46 void
  47 load_srec (desc, file, load_offset, maxrecsize, flags, hashmark, waitack)
  48      serial_t desc;
  49      const char *file;
  50      bfd_vma load_offset;
  51      int maxrecsize;
  52      int flags;
  53      int hashmark;
  54      int (*waitack) (void);
  55 {
  56   bfd *abfd;
  57   asection *s;
  58   char *srec;
  59   int i;
  60   int reclen;
  61   time_t start_time, end_time;
  62   unsigned long data_count = 0;
  63
  64   srec = (char *) alloca (maxrecsize + 1);
  65
  66   abfd = bfd_openr (file, 0);
  67   if (!abfd)
  68     {
  69       printf_filtered ("Unable to open file %s\n", file);
  70       return;
  71     }
  72
  73   if (bfd_check_format (abfd, bfd_object) == 0)
  74     {
  75       printf_filtered ("File is not an object file\n");
  76       return;
  77     }
  78
  79   start_time = time (NULL);
  80
  81   /* Write a type 0 header record. no data for a type 0, and there
  82      is no data, so len is 0.  */
  83
  84   reclen = maxrecsize;
  85   make_srec (srec, 0, NULL, (asection *) 1, 0, &reclen, flags);
  86   if (remote_debug)
  87     {
  88       srec[reclen] = '\0';
  89       puts_debug ("sent -->", srec, "<--");
  90     }
  91   SERIAL_WRITE (desc, srec, reclen);
  92
  93   for (s = abfd->sections; s; s = s->next)
  94     if (s->flags & SEC_LOAD)
  95       {
  96         int numbytes;
  97         bfd_vma addr = bfd_get_section_vma (abfd, s) + load_offset;
  98         bfd_size_type size = bfd_get_section_size_before_reloc (s);
  99         char *section_name = (char *) bfd_get_section_name (abfd, s);
 100         /* Both GDB and BFD have mechanisms for printing addresses.
 101            In the below, GDB's is used so that the address is
 102            consistent with the rest of GDB.  BFD's printf_vma() could
 103            have also been used. cagney 1999-09-01 */
 104         printf_filtered ("%s\t: 0x%s .. 0x%s  ",
 105                          section_name,
 106                          paddr (addr),
 107                          paddr (addr + size));
 108         gdb_flush (gdb_stdout);
 109
 110         data_count += size;
 111
 112         for (i = 0; i < size; i += numbytes)
 113           {
 114             reclen = maxrecsize;
 115             numbytes = make_srec (srec, (CORE_ADDR) (addr + i), abfd, s,
 116                                   i, &reclen, flags);
 117
 118             if (remote_debug)
 119               {
 120                 srec[reclen] = '\0';
 121                 puts_debug ("sent -->", srec, "<--");
 122               }
 123
 124             /* Repeatedly send the S-record until a good
 125                acknowledgement is sent back.  */
 126             do
 127               {
 128                 SERIAL_WRITE (desc, srec, reclen);
 129                 if (ui_load_progress_hook)
 130                   if (ui_load_progress_hook (section_name, (unsigned long) i))
 131                     error ("Canceled the download");
 132               }
 133             while (waitack != NULL && !waitack ());
 134
 135             if (hashmark)
 136               {
 137                 putchar_unfiltered ('#');
 138                 gdb_flush (gdb_stdout);
 139               }
 140           }                     /* Per-packet (or S-record) loop */
 141
 142         if (ui_load_progress_hook)
 143           if (ui_load_progress_hook (section_name, (unsigned long) i))
 144             error ("Canceled the download");
 145         putchar_unfiltered ('\n');
 146       }
 147
 148   if (hashmark)
 149     putchar_unfiltered ('\n');
 150
 151   end_time = time (NULL);
 152
 153   /* Write a terminator record.  */
 154
 155   reclen = maxrecsize;
 156   make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);
 157
 158   if (remote_debug)
 159     {
 160       srec[reclen] = '\0';
 161       puts_debug ("sent -->", srec, "<--");
 162     }
 163
 164   SERIAL_WRITE (desc, srec, reclen);
 165
 166   /* Some monitors need these to wake up properly.  (Which ones? -sts)  */
 167   SERIAL_WRITE (desc, "\r\r", 2);
 168   if (remote_debug)
 169     puts_debug ("sent -->", "\r\r", "<---");
 170
 171   SERIAL_FLUSH_INPUT (desc);
 172
 173   report_transfer_performance (data_count, start_time, end_time);
 174 }
 175
 176 /*
 177  * make_srec -- make an srecord. This writes each line, one at a
 178  *      time, each with it's own header and trailer line.
 179  *      An srecord looks like this:
 180  *
 181  * byte count-+     address
 182  * start ---+ |        |       data        +- checksum
 183  *          | |        |                   |
 184  *        S01000006F6B692D746573742E73726563E4
 185  *        S315000448600000000000000000FC00005900000000E9
 186  *        S31A0004000023C1400037DE00F023604000377B009020825000348D
 187  *        S30B0004485A0000000000004E
 188  *        S70500040000F6
 189  *
 190  *      S<type><length><address><data><checksum>
 191  *
 192  *      Where
 193  *      - length
 194  *        is the number of bytes following upto the checksum. Note that
 195  *        this is not the number of chars following, since it takes two
 196  *        chars to represent a byte.
 197  *      - type
 198  *        is one of:
 199  *        0) header record
 200  *        1) two byte address data record
 201  *        2) three byte address data record
 202  *        3) four byte address data record
 203  *        7) four byte address termination record
 204  *        8) three byte address termination record
 205  *        9) two byte address termination record
 206  *
 207  *      - address
 208  *        is the start address of the data following, or in the case of
 209  *        a termination record, the start address of the image
 210  *      - data
 211  *        is the data.
 212  *      - checksum
 213  *        is the sum of all the raw byte data in the record, from the length
 214  *        upwards, modulo 256 and subtracted from 255.
 215  *
 216  * This routine returns the length of the S-record.
 217  *
 218  */
 219
 220 static int
 221 make_srec (srec, targ_addr, abfd, sect, sectoff, maxrecsize, flags)
 222      char *srec;
 223      CORE_ADDR targ_addr;
 224      bfd *abfd;
 225      asection *sect;
 226      int sectoff;
 227      int *maxrecsize;
 228      int flags;
 229 {
 230   unsigned char checksum;
 231   int tmp;
 232   const static char hextab[] = "0123456789ABCDEF";
 233   const static char data_code_table[] = "123";
 234   const static char term_code_table[] = "987";
 235   const static char header_code_table[] = "000";
 236   const static char *formats[] =
 237   {"S%c%02X%04X",
 238    "S%c%02X%06X",
 239    "S%c%02X%08X"};
 240   char const *code_table;
 241   int addr_size;
 242   int payload_size;
 243   char *binbuf;
 244   char *p;
 245
 246   if (sect)
 247     {
 248       tmp = flags;              /* Data or header record */
 249       code_table = abfd ? data_code_table : header_code_table;
 250       binbuf = alloca (*maxrecsize / 2);
 251     }
 252   else
 253     {
 254       tmp = flags >> SREC_TERM_SHIFT;   /* Term record */
 255       code_table = term_code_table;
 256     }
 257
 258   if ((tmp & SREC_2_BYTE_ADDR) && (targ_addr <= 0xffff))
 259     addr_size = 2;
 260   else if ((tmp & SREC_3_BYTE_ADDR) && (targ_addr <= 0xffffff))
 261     addr_size = 3;
 262   else if (tmp & SREC_4_BYTE_ADDR)
 263     addr_size = 4;
 264   else
 265     internal_error ("make_srec:  Bad address (0x%x), or bad flags (0x%x).",
 266                     targ_addr, flags);
 267
 268   /* Now that we know the address size, we can figure out how much
 269      data this record can hold.  */
 270
 271   if (sect && abfd)
 272     {
 273       payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;
 274       payload_size = min (payload_size, sect->_raw_size - sectoff);
 275
 276       bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);
 277     }
 278   else
 279     payload_size = 0;           /* Term or header packets have no payload */
 280
 281   /* Output the header.  */
 282
 283   sprintf (srec, formats[addr_size - 2], code_table[addr_size - 2],
 284            addr_size + payload_size + 1, (int) targ_addr);
 285
 286   /* Note that the checksum is calculated on the raw data, not the
 287      hexified data.  It includes the length, address and the data
 288      portions of the packet.  */
 289
 290   checksum = 0;
 291
 292   checksum += (payload_size + addr_size + 1     /* Packet length */
 293                + (targ_addr & 0xff)     /* Address... */
 294                + ((targ_addr >> 8) & 0xff)
 295                + ((targ_addr >> 16) & 0xff)
 296                + ((targ_addr >> 24) & 0xff));
 297
 298   p = srec + 1 + 1 + 2 + addr_size * 2;
 299
 300   /* Build the Srecord.  */
 301   for (tmp = 0; tmp < payload_size; tmp++)
 302     {
 303       unsigned char k;
 304
 305       k = binbuf[tmp];
 306       *p++ = hextab[k >> 4];
 307       *p++ = hextab[k & 0xf];
 308       checksum += k;
 309     }
 310
 311   checksum = ~checksum;
 312
 313   *p++ = hextab[checksum >> 4];
 314   *p++ = hextab[checksum & 0xf];
 315   *p++ = '\r';
 316
 317   *maxrecsize = p - srec;
 318   return payload_size;
 319 }