255 lines
7.1 KiB
C
255 lines
7.1 KiB
C
/* S-record download support for GDB, the GNU debugger.
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Copyright 1995, 1996 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "serial.h"
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#include "srec.h"
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extern int remote_debug;
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static int make_srec PARAMS ((char *srec, CORE_ADDR targ_addr, bfd *abfd,
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asection *sect, int sectoff, int *maxrecsize,
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int flags));
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/* Download an executable by converting it to S records. DESC is a serial_t
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to send the data to. FILE is the name of the file to be loaded.
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MAXRECSIZE is the length in chars of the largest S-record the host can
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accomodate. This is measured from the starting `S' to the last char of the
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checksum. FLAGS is various random flags, and HASHMARK is non-zero to cause
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a `#' to be printed out for each record loaded. */
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void
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load_srec (desc, file, maxrecsize, flags, hashmark)
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serial_t desc;
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const char *file;
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int maxrecsize;
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int flags;
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int hashmark;
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{
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bfd *abfd;
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asection *s;
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char *srec;
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int i;
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int reclen;
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srec = (char *)alloca (maxrecsize + 1);
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abfd = bfd_openr (file, 0);
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if (!abfd)
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{
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printf_filtered ("Unable to open file %s\n", file);
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return;
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}
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if (bfd_check_format (abfd, bfd_object) == 0)
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{
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printf_filtered ("File is not an object file\n");
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return;
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}
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for (s = abfd->sections; s; s = s->next)
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if (s->flags & SEC_LOAD)
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{
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int numbytes;
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printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma,
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s->vma + s->_raw_size);
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gdb_flush (gdb_stdout);
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for (i = 0; i < s->_raw_size; i += numbytes)
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{
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reclen = maxrecsize;
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numbytes = make_srec (srec, s->vma + i, abfd, s, i, &reclen,
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flags);
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if (remote_debug)
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fprintf_unfiltered (gdb_stderr, "%.*s\\r\n", reclen-1, srec);
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SERIAL_WRITE (desc, srec, reclen);
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if (hashmark)
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{
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putchar_unfiltered ('#');
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gdb_flush (gdb_stdout);
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}
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} /* Per-packet (or S-record) loop */
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putchar_unfiltered ('\n');
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} /* Loadable sections */
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if (hashmark)
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putchar_unfiltered ('\n');
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/* Write a type 7 terminator record. no data for a type 7, and there
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is no data, so len is 0. */
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reclen = maxrecsize;
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make_srec (srec, abfd->start_address, NULL, NULL, 0, &reclen, flags);
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if (remote_debug)
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fprintf_unfiltered (gdb_stderr, "%.*s\\r\n", reclen-1, srec);
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SERIAL_WRITE (desc, srec, reclen);
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SERIAL_WRITE (desc, "\r\r", 2); /* Some monitors need these to wake up */
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SERIAL_FLUSH_INPUT (desc);
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}
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/*
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* make_srec -- make an srecord. This writes each line, one at a
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* time, each with it's own header and trailer line.
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* An srecord looks like this:
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*
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* byte count-+ address
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* start ---+ | | data +- checksum
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* | | | |
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* S01000006F6B692D746573742E73726563E4
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* S315000448600000000000000000FC00005900000000E9
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* S31A0004000023C1400037DE00F023604000377B009020825000348D
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* S30B0004485A0000000000004E
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* S70500040000F6
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*
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* S<type><length><address><data><checksum>
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*
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* Where
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* - length
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* is the number of bytes following upto the checksum. Note that
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* this is not the number of chars following, since it takes two
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* chars to represent a byte.
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* - type
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* is one of:
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* 0) header record
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* 1) two byte address data record
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* 2) three byte address data record
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* 3) four byte address data record
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* 7) four byte address termination record
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* 8) three byte address termination record
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* 9) two byte address termination record
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*
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* - address
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* is the start address of the data following, or in the case of
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* a termination record, the start address of the image
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* - data
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* is the data.
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* - checksum
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* is the sum of all the raw byte data in the record, from the length
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* upwards, modulo 256 and subtracted from 255.
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*
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* This routine returns the length of the S-record.
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*
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*/
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static int
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make_srec (srec, targ_addr, abfd, sect, sectoff, maxrecsize, flags)
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char *srec;
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CORE_ADDR targ_addr;
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bfd *abfd;
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asection *sect;
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int sectoff;
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int *maxrecsize;
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int flags;
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{
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unsigned char checksum;
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int tmp;
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const static char hextab[] = "0123456789ABCDEF";
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const static char data_code_table[] = "xx123";
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const static char term_code_table[] = "xx987";
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const static char *formats[] = {NULL, NULL, "S%c%02X%04X", "S%c%02X%06X",
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"S%c%02X%08X"};
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char const *code_table;
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int addr_size;
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int payload_size;
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int type_code;
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char *binbuf;
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char *p;
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if (sect)
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{
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tmp = flags; /* Data record */
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code_table = data_code_table;
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binbuf = alloca (*maxrecsize/2);
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}
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else
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{
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tmp = flags >> SREC_TERM_SHIFT; /* Term record */
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code_table = term_code_table;
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}
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if (tmp & SREC_4_BYTE_ADDR && targ_addr > 0xffffff)
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addr_size = 4;
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else if (tmp & SREC_3_BYTE_ADDR && targ_addr > 0xffff)
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addr_size = 3;
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else if (tmp & SREC_2_BYTE_ADDR && targ_addr > 0xff)
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addr_size = 2;
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else
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fatal ("make_srec: Bad address (0x%x), or bad flags (0x%x).", targ_addr,
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flags);
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/* Now that we know the address size, we can figure out how much data this
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record can hold. */
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if (sect)
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{
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payload_size = (*maxrecsize - (1 + 1 + 2 + addr_size * 2 + 2)) / 2;
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payload_size = min (payload_size, sect->_raw_size - sectoff);
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bfd_get_section_contents (abfd, sect, binbuf, sectoff, payload_size);
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}
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else
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payload_size = 0; /* Term packets have no payload */
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/* Output the header. */
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sprintf (srec, formats[addr_size], code_table[addr_size],
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addr_size + payload_size + 1, targ_addr);
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/* Note that the checksum is calculated on the raw data, not the hexified
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data. It includes the length, address and the data portions of the
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packet. */
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checksum = 0;
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checksum += (payload_size + addr_size + 1 /* Packet length */
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+ (targ_addr & 0xff) /* Address... */
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+ ((targ_addr >> 8) & 0xff)
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+ ((targ_addr >> 16) & 0xff)
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+ ((targ_addr >> 24) & 0xff));
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p = srec + 1 + 1 + 2 + addr_size * 2;
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/* build the srecord */
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for (tmp = 0; tmp < payload_size; tmp++)
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{
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unsigned char k;
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k = binbuf[tmp];
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*p++ = hextab [k >> 4];
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*p++ = hextab [k & 0xf];
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checksum += k;
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}
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checksum = ~checksum;
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*p++ = hextab[checksum >> 4];
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*p++ = hextab[checksum & 0xf];
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*p++ = '\r';
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*maxrecsize = p - srec;
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return payload_size;
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}
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