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 #include "gdb_assert.h"
  27 #include "gdb_string.h"
  28
  29 extern void report_transfer_performance (unsigned long, time_t, time_t);
  30
  31 extern int remote_debug;
  32
  33 static int make_srec (char *srec, CORE_ADDR targ_addr, bfd * abfd,
  34                       asection * sect, int sectoff, int *maxrecsize,
  35                       int flags);
  36
  37 /* Download an executable by converting it to S records.  DESC is a
  38    `struct serial *' to send the data to.  FILE is the name of the
  39    file to be loaded.  LOAD_OFFSET is the offset into memory to load
  40    data into.  It is usually specified by the user and is useful with
  41    the a.out file format.  MAXRECSIZE is the length in chars of the
  42    largest S-record the host can accomodate.  This is measured from
  43    the starting `S' to the last char of the checksum.  FLAGS is
  44    various random flags, and HASHMARK is non-zero to cause a `#' to be
  45    printed out for each record loaded.  WAITACK, if non-NULL, is a
  46    function that waits for an acknowledgement after each S-record, and
  47    returns non-zero if the ack is read correctly.  */
  48
  49 void
  50 load_srec (struct serial *desc, const char *file, bfd_vma load_offset,
  51            int maxrecsize,
  52            int flags, int hashmark, int (*waitack) (void))
  53 {
  54   bfd *abfd;
  55   asection *s;
  56   char *srec;
  57   int i;
  58   int reclen;
  59   time_t start_time, end_time;
  60   unsigned long data_count = 0;
  61
  62   srec = (char *) alloca (maxrecsize + 1);
  63
  64   abfd = bfd_openr (file, 0);
  65   if (!abfd)
  66     {
  67       printf_filtered ("Unable to open file %s\n", file);
  68       return;
  69     }
  70
  71   if (bfd_check_format (abfd, bfd_object) == 0)
  72     {
  73       printf_filtered ("File is not an object file\n");
  74       return;
  75     }
  76
  77   start_time = time (NULL);
  78
  79   /* Write a type 0 header record. no data for a type 0, and there
  80      is no data, so len is 0.  */
  81
  82   reclen = maxrecsize;
  83   make_srec (srec, 0, NULL, (asection *) 1, 0, &reclen, flags);
  84   if (remote_debug)
  85     {
  86       srec[reclen] = '\0';
  87       puts_debug ("sent -->", srec, "<--");
  88     }
  89   serial_write (desc, srec, reclen);
  90
  91   for (s = abfd->sections; s; s = s->next)
  92     if (s->flags & SEC_LOAD)
  93       {
  94         int numbytes;
  95         bfd_vma addr = bfd_get_section_vma (abfd, s) + load_offset;
  96         bfd_size_type size = bfd_get_section_size_before_reloc (s);
  97         char *section_name = (char *) bfd_get_section_name (abfd, s);
  98         /* Both GDB and BFD have mechanisms for printing addresses.
  99            In the below, GDB's is used so that the address is
 100            consistent with the rest of GDB.  BFD's printf_vma() could
 101            have also been used. cagney 1999-09-01 */
 102         printf_filtered ("%s\t: 0x%s .. 0x%s  ",
 103                          section_name,
 104                          paddr (addr),
 105                          paddr (addr + size));
 106         gdb_flush (gdb_stdout);
 107
 108         data_count += size;
 109
 110         for (i = 0; i < size; i += numbytes)
 111           {
 112             reclen = maxrecsize;
 113             numbytes = make_srec (srec, (CORE_ADDR) (addr + i), abfd, s,
 114                                   i, &reclen, flags);
 115
 116             if (remote_debug)
 117               {
 118                 srec[reclen] = '\0';
 119                 puts_debug ("sent -->", srec, "<--");
 120               }
 121
 122             /* Repeatedly send the S-record until a good
 123                acknowledgement is sent back.  */
 124             do
 125               {
 126                 serial_write (desc, srec, reclen);
 127                 if (ui_load_progress_hook)
 128                   if (ui_load_progress_hook (section_name, (unsigned long) i))
 129                     error ("Canceled the download");
 130               }
 131             while (waitack != NULL && !waitack ());
 132
 133             if (hashmark)
 134               {
 135                 putchar_unfiltered ('#');
 136                 gdb_flush (gdb_stdout);
 137               }
 138           }                     /* Per-packet (or S-record) loop */
 139
 140         if (ui_load_progress_hook)
 141           if (ui_load_progress_hook (section_name, (unsigned long) i))
 142             error ("Canceled the download");
 143         putchar_unfiltered ('\n');
 144       }
 145
 146   if (hashmark)
 147     putchar_unfiltered ('\n');
 148
 149   end_time = time (NULL);
 150
 151   /* Write a terminator record.  */
 152
 153   reclen = maxrecsize;
 154   make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);
 155
 156   if (remote_debug)
 157     {
 158       srec[reclen] = '\0';
 159       puts_debug ("sent -->", srec, "<--");
 160     }
 161
 162   serial_write (desc, srec, reclen);
 163
 164   /* Some monitors need these to wake up properly.  (Which ones? -sts)  */
 165   serial_write (desc, "\r\r", 2);
 166   if (remote_debug)
 167     puts_debug ("sent -->", "\r\r", "<---");
 168
 169   serial_flush_input (desc);
 170
 171   report_transfer_performance (data_count, start_time, end_time);
 172 }
 173
 174 /*
 175  * make_srec -- make an srecord. This writes each line, one at a
 176  *      time, each with it's own header and trailer line.
 177  *      An srecord looks like this:
 178  *
 179  * byte count-+     address
 180  * start ---+ |        |       data        +- checksum
 181  *          | |        |                   |
 182  *        S01000006F6B692D746573742E73726563E4
 183  *        S315000448600000000000000000FC00005900000000E9
 184  *        S31A0004000023C1400037DE00F023604000377B009020825000348D
 185  *        S30B0004485A0000000000004E
 186  *        S70500040000F6
 187  *
 188  *      S<type><length><address><data><checksum>
 189  *
 190  *      Where
 191  *      - length
 192  *        is the number of bytes following upto the checksum. Note that
 193  *        this is not the number of chars following, since it takes two
 194  *        chars to represent a byte.
 195  *      - type
 196  *        is one of:
 197  *        0) header record
 198  *        1) two byte address data record
 199  *        2) three byte address data record
 200  *        3) four byte address data record
 201  *        7) four byte address termination record
 202  *        8) three byte address termination record
 203  *        9) two byte address termination record
 204  *
 205  *      - address
 206  *        is the start address of the data following, or in the case of
 207  *        a termination record, the start address of the image
 208  *      - data
 209  *        is the data.
 210  *      - checksum
 211  *        is the sum of all the raw byte data in the record, from the length
 212  *        upwards, modulo 256 and subtracted from 255.
 213  *
 214  * This routine returns the length of the S-record.
 215  *
 216  */
 217
 218 static int
 219 make_srec (char *srec, CORE_ADDR targ_addr, bfd *abfd, asection *sect,
 220            int sectoff, int *maxrecsize, int flags)
 221 {
 222   unsigned char checksum;
 223   int tmp;
 224   const static char hextab[] = "0123456789ABCDEF";
 225   const static char data_code_table[] = "123";
 226   const static char term_code_table[] = "987";
 227   const static char header_code_table[] = "000";
 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       binbuf = NULL;
 245     }
 246
 247   if ((tmp & SREC_2_BYTE_ADDR) && (targ_addr <= 0xffff))
 248     addr_size = 2;
 249   else if ((tmp & SREC_3_BYTE_ADDR) && (targ_addr <= 0xffffff))
 250     addr_size = 3;
 251   else if (tmp & SREC_4_BYTE_ADDR)
 252     addr_size = 4;
 253   else
 254     internal_error (__FILE__, __LINE__,
 255                     "make_srec:  Bad address (0x%s), or bad flags (0x%x).",
 256                     paddr (targ_addr), flags);
 257
 258   /* Now that we know the address size, we can figure out how much
 259      data this record can hold.  */
 260
 261   if (sect && abfd)
 262     {
 263       payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;
 264       payload_size = min (payload_size, sect->_raw_size - sectoff);
 265
 266       bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);
 267     }
 268   else
 269     payload_size = 0;           /* Term or header packets have no payload */
 270
 271   /* Output the header.  */
 272   snprintf (srec, (*maxrecsize) + 1, "S%c%02X%0*X",
 273             code_table[addr_size - 2],
 274             addr_size + payload_size + 1,
 275             addr_size * 2, (int) targ_addr);
 276
 277   /* Note that the checksum is calculated on the raw data, not the
 278      hexified data.  It includes the length, address and the data
 279      portions of the packet.  */
 280
 281   checksum = 0;
 282
 283   checksum += (payload_size + addr_size + 1     /* Packet length */
 284                + (targ_addr & 0xff)     /* Address... */
 285                + ((targ_addr >> 8) & 0xff)
 286                + ((targ_addr >> 16) & 0xff)
 287                + ((targ_addr >> 24) & 0xff));
 288
 289   /* NOTE: cagney/2003-08-10: The equation is old.  Check that the
 290      recent snprintf changes match that equation.  */
 291   gdb_assert (strlen (srec) == 1 + 1 + 2 + addr_size * 2);
 292   p = srec + 1 + 1 + 2 + addr_size * 2;
 293
 294   /* Build the Srecord.  */
 295   for (tmp = 0; tmp < payload_size; tmp++)
 296     {
 297       unsigned char k;
 298
 299       k = binbuf[tmp];
 300       *p++ = hextab[k >> 4];
 301       *p++ = hextab[k & 0xf];
 302       checksum += k;
 303     }
 304
 305   checksum = ~checksum;
 306
 307   *p++ = hextab[checksum >> 4];
 308   *p++ = hextab[checksum & 0xf];
 309   *p++ = '\r';
 310
 311   *maxrecsize = p - srec;
 312   return payload_size;
 313 }