aboutsummaryrefslogtreecommitdiff
path: root/gdb/dsrec.c
blob: 736019fd1067dd2492df2cf1433e229b96fd0c0a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
/* S-record download support for GDB, the GNU debugger.
   Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004, 2007, 2008,
   2009, 2010, 2011 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;
}