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 (serial_t desc, const char *file, bfd_vma load_offset, int maxrecsize,
  48            int flags, int hashmark, int (*waitack) (void))
  49 {
  50   bfd *abfd;
  51   asection *s;
  52   char *srec;
  53   int i;
  54   int reclen;
  55   time_t start_time, end_time;
  56   unsigned long data_count = 0;
  57
  58   srec = (char *) alloca (maxrecsize + 1);
  59
  60   abfd = bfd_openr (file, 0);
  61   if (!abfd)
  62     {
  63       printf_filtered ("Unable to open file %s\n", file);
  64       return;
  65     }
  66
  67   if (bfd_check_format (abfd, bfd_object) == 0)
  68     {
  69       printf_filtered ("File is not an object file\n");
  70       return;
  71     }
  72
  73   start_time = time (NULL);
  74
  75   /* Write a type 0 header record. no data for a type 0, and there
  76      is no data, so len is 0.  */
  77
  78   reclen = maxrecsize;
  79   make_srec (srec, 0, NULL, (asection *) 1, 0, &reclen, flags);
  80   if (remote_debug)
  81     {
  82       srec[reclen] = '\0';
  83       puts_debug ("sent -->", srec, "<--");
  84     }
  85   SERIAL_WRITE (desc, srec, reclen);
  86
  87   for (s = abfd->sections; s; s = s->next)
  88     if (s->flags & SEC_LOAD)
  89       {
  90         int numbytes;
  91         bfd_vma addr = bfd_get_section_vma (abfd, s) + load_offset;
  92         bfd_size_type size = bfd_get_section_size_before_reloc (s);
  93         char *section_name = (char *) bfd_get_section_name (abfd, s);
  94         /* Both GDB and BFD have mechanisms for printing addresses.
  95            In the below, GDB's is used so that the address is
  96            consistent with the rest of GDB.  BFD's printf_vma() could
  97            have also been used. cagney 1999-09-01 */
  98         printf_filtered ("%s\t: 0x%s .. 0x%s  ",
  99                          section_name,
 100                          paddr (addr),
 101                          paddr (addr + size));
 102         gdb_flush (gdb_stdout);
 103
 104         data_count += size;
 105
 106         for (i = 0; i < size; i += numbytes)
 107           {
 108             reclen = maxrecsize;
 109             numbytes = make_srec (srec, (CORE_ADDR) (addr + i), abfd, s,
 110                                   i, &reclen, flags);
 111
 112             if (remote_debug)
 113               {
 114                 srec[reclen] = '\0';
 115                 puts_debug ("sent -->", srec, "<--");
 116               }
 117
 118             /* Repeatedly send the S-record until a good
 119                acknowledgement is sent back.  */
 120             do
 121               {
 122                 SERIAL_WRITE (desc, srec, reclen);
 123                 if (ui_load_progress_hook)
 124                   if (ui_load_progress_hook (section_name, (unsigned long) i))
 125                     error ("Canceled the download");
 126               }
 127             while (waitack != NULL && !waitack ());
 128
 129             if (hashmark)
 130               {
 131                 putchar_unfiltered ('#');
 132                 gdb_flush (gdb_stdout);
 133               }
 134           }                     /* Per-packet (or S-record) loop */
 135
 136         if (ui_load_progress_hook)
 137           if (ui_load_progress_hook (section_name, (unsigned long) i))
 138             error ("Canceled the download");
 139         putchar_unfiltered ('\n');
 140       }
 141
 142   if (hashmark)
 143     putchar_unfiltered ('\n');
 144
 145   end_time = time (NULL);
 146
 147   /* Write a terminator record.  */
 148
 149   reclen = maxrecsize;
 150   make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);
 151
 152   if (remote_debug)
 153     {
 154       srec[reclen] = '\0';
 155       puts_debug ("sent -->", srec, "<--");
 156     }
 157
 158   SERIAL_WRITE (desc, srec, reclen);
 159
 160   /* Some monitors need these to wake up properly.  (Which ones? -sts)  */
 161   SERIAL_WRITE (desc, "\r\r", 2);
 162   if (remote_debug)
 163     puts_debug ("sent -->", "\r\r", "<---");
 164
 165   SERIAL_FLUSH_INPUT (desc);
 166
 167   report_transfer_performance (data_count, start_time, end_time);
 168 }
 169
 170 /*
 171  * make_srec -- make an srecord. This writes each line, one at a
 172  *      time, each with it's own header and trailer line.
 173  *      An srecord looks like this:
 174  *
 175  * byte count-+     address
 176  * start ---+ |        |       data        +- checksum
 177  *          | |        |                   |
 178  *        S01000006F6B692D746573742E73726563E4
 179  *        S315000448600000000000000000FC00005900000000E9
 180  *        S31A0004000023C1400037DE00F023604000377B009020825000348D
 181  *        S30B0004485A0000000000004E
 182  *        S70500040000F6
 183  *
 184  *      S<type><length><address><data><checksum>
 185  *
 186  *      Where
 187  *      - length
 188  *        is the number of bytes following upto the checksum. Note that
 189  *        this is not the number of chars following, since it takes two
 190  *        chars to represent a byte.
 191  *      - type
 192  *        is one of:
 193  *        0) header record
 194  *        1) two byte address data record
 195  *        2) three byte address data record
 196  *        3) four byte address data record
 197  *        7) four byte address termination record
 198  *        8) three byte address termination record
 199  *        9) two byte address termination record
 200  *
 201  *      - address
 202  *        is the start address of the data following, or in the case of
 203  *        a termination record, the start address of the image
 204  *      - data
 205  *        is the data.
 206  *      - checksum
 207  *        is the sum of all the raw byte data in the record, from the length
 208  *        upwards, modulo 256 and subtracted from 255.
 209  *
 210  * This routine returns the length of the S-record.
 211  *
 212  */
 213
 214 static int
 215 make_srec (char *srec, CORE_ADDR targ_addr, bfd *abfd, asection *sect,
 216            int sectoff, int *maxrecsize, int flags)
 217 {
 218   unsigned char checksum;
 219   int tmp;
 220   const static char hextab[] = "0123456789ABCDEF";
 221   const static char data_code_table[] = "123";
 222   const static char term_code_table[] = "987";
 223   const static char header_code_table[] = "000";
 224   const static char *formats[] =
 225   {"S%c%02X%04X",
 226    "S%c%02X%06X",
 227    "S%c%02X%08X"};
 228   char const *code_table;
 229   int addr_size;
 230   int payload_size;
 231   char *binbuf;
 232   char *p;
 233
 234   if (sect)
 235     {
 236       tmp = flags;              /* Data or header record */
 237       code_table = abfd ? data_code_table : header_code_table;
 238       binbuf = alloca (*maxrecsize / 2);
 239     }
 240   else
 241     {
 242       tmp = flags >> SREC_TERM_SHIFT;   /* Term record */
 243       code_table = term_code_table;
 244     }
 245
 246   if ((tmp & SREC_2_BYTE_ADDR) && (targ_addr <= 0xffff))
 247     addr_size = 2;
 248   else if ((tmp & SREC_3_BYTE_ADDR) && (targ_addr <= 0xffffff))
 249     addr_size = 3;
 250   else if (tmp & SREC_4_BYTE_ADDR)
 251     addr_size = 4;
 252   else
 253     internal_error ("make_srec:  Bad address (0x%x), or bad flags (0x%x).",
 254                     targ_addr, flags);
 255
 256   /* Now that we know the address size, we can figure out how much
 257      data this record can hold.  */
 258
 259   if (sect && abfd)
 260     {
 261       payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;
 262       payload_size = min (payload_size, sect->_raw_size - sectoff);
 263
 264       bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);
 265     }
 266   else
 267     payload_size = 0;           /* Term or header packets have no payload */
 268
 269   /* Output the header.  */
 270
 271   sprintf (srec, formats[addr_size - 2], code_table[addr_size - 2],
 272            addr_size + payload_size + 1, (int) targ_addr);
 273
 274   /* Note that the checksum is calculated on the raw data, not the
 275      hexified data.  It includes the length, address and the data
 276      portions of the packet.  */
 277
 278   checksum = 0;
 279
 280   checksum += (payload_size + addr_size + 1     /* Packet length */
 281                + (targ_addr & 0xff)     /* Address... */
 282                + ((targ_addr >> 8) & 0xff)
 283                + ((targ_addr >> 16) & 0xff)
 284                + ((targ_addr >> 24) & 0xff));
 285
 286   p = srec + 1 + 1 + 2 + addr_size * 2;
 287
 288   /* Build the Srecord.  */
 289   for (tmp = 0; tmp < payload_size; tmp++)
 290     {
 291       unsigned char k;
 292
 293       k = binbuf[tmp];
 294       *p++ = hextab[k >> 4];
 295       *p++ = hextab[k & 0xf];
 296       checksum += k;
 297     }
 298
 299   checksum = ~checksum;
 300
 301   *p++ = hextab[checksum >> 4];
 302   *p++ = hextab[checksum & 0xf];
 303   *p++ = '\r';
 304
 305   *maxrecsize = p - srec;
 306   return payload_size;
 307 }