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/* S-record download support for GDB, the GNU debugger.
Copyright 1995 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "serial.h"
#include "srec.h"
extern int remote_debug;
static int make_srec PARAMS ((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 serial_t
to send the data to. FILE is the name of the file to be loaded.
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. */
void
load_srec (desc, file, maxrecsize, flags, hashmark)
serial_t desc;
const char *file;
int maxrecsize;
int flags;
int hashmark;
{
bfd *abfd;
asection *s;
char *buffer, srec[1024];
int i;
int reclen;
buffer = 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;
}
for (s = abfd->sections; s; s = s->next)
if (s->flags & SEC_LOAD)
{
int numbytes;
printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma,
s->vma + s->_raw_size);
gdb_flush (gdb_stdout);
for (i = 0; i < s->_raw_size; i += numbytes)
{
reclen = maxrecsize;
numbytes = make_srec (srec, s->vma + i, abfd, s, i, &reclen,
flags);
if (remote_debug)
fprintf_unfiltered (gdb_stderr, "%.*s\\r\n", reclen-1, srec);
SERIAL_WRITE (desc, srec, reclen);
if (hashmark)
{
putchar_unfiltered ('#');
gdb_flush (gdb_stdout);
}
} /* Per-packet (or S-record) loop */
putchar_unfiltered ('\n');
} /* Loadable sections */
if (hashmark)
putchar_unfiltered ('\n');
/* Write a type 7 terminator record. no data for a type 7, and there
is no data, so len is 0. */
reclen = maxrecsize;
make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);
if (remote_debug)
fprintf_unfiltered (gdb_stderr, "%.*s\\r\n", reclen-1, srec);
SERIAL_WRITE (desc, srec, reclen);
SERIAL_WRITE (desc, "\r\r", 3); /* Some monitors need these to wake up */
SERIAL_FLUSH_INPUT (desc);
}
/*
* 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 (srec, targ_addr, abfd, sect, sectoff, maxrecsize, flags)
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[] = "xx123";
const static char term_code_table[] = "xx987";
const static char *formats[] = {NULL, NULL, "S%c%02X%04X", "S%c%02X%06X",
"S%c%02X%08X"};
char const *code_table;
int addr_size;
int payload_size;
int type_code;
char *binbuf;
char *p;
if (sect)
{
tmp = flags; /* Data record */
code_table = data_code_table;
binbuf = alloca (*maxrecsize/2);
}
else
{
tmp = flags >> SREC_TERM_SHIFT; /* Term record */
code_table = term_code_table;
}
if (tmp & SREC_4_BYTE_ADDR && targ_addr > 0xffffff)
addr_size = 4;
else if (tmp & SREC_3_BYTE_ADDR && targ_addr > 0xffff)
addr_size = 3;
else if (tmp & SREC_2_BYTE_ADDR && targ_addr > 0xff)
addr_size = 2;
else
fatal ("make_srec: Bad address (0x%x), or bad flags (0x%x).", targ_addr,
flags);
/* Now that we know the address size, we can figure out how much data this
record can hold. */
if (sect)
{
payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;
payload_size = min (payload_size, sect->_raw_size - sectoff);
bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);
}
else
payload_size = 0; /* Term packets have no payload */
/* Output the header. */
sprintf (srec, formats[addr_size], code_table[addr_size],
addr_size + payload_size + 1, 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));
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;
}
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