744 lines
21 KiB
C
744 lines
21 KiB
C
/* 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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/* This started out life as code shared between the nindy monitor and
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GDB. For various reasons, this is no longer true. Eventually, it
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probably should be merged into remote-nindy.c. */
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/******************************************************************************
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*
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* NINDY INTERFACE ROUTINES
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*
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* This version of the NINDY interface routines supports NINDY versions
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* 2.13 and older. The older versions used a hex communication protocol,
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* instead of the (faster) current binary protocol. These routines have
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* been renamed by prepending the letter 'O' to their names, to avoid
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* conflict with the current version. The old versions are kept only for
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* backward compatibility, and well disappear in a future release.
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*
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**************************************************************************/
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/* Having these in a separate file from nindy.c is really ugly, and should
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be merged with nindy.c. */
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#include <stdio.h>
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#if 0
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#include <sys/ioctl.h>
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#include <sys/types.h> /* Needed by file.h on Sys V */
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#include <sys/file.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <fcntl.h> /* Needed on Sys V */
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#include "ttycntl.h"
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#endif
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#include "defs.h"
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#include "serial.h"
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#include "block_io.h"
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#include "wait.h"
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#include "env.h"
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/* Number of bytes that we send to nindy. I believe this is defined by
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the protocol (it does not agree with REGISTER_BYTES). */
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#define OLD_NINDY_REGISTER_BYTES ((36*4) + (4*8))
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extern int quiet; /* 1 => stifle unnecessary messages */
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/* tty connected to 960/NINDY board. */
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extern serial_t nindy_serial;
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static OninStrGet();
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/****************************
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* *
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* MISCELLANEOUS UTILTIES *
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* *
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****************************/
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/******************************************************************************
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* fromhex:
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* Convert a hex ascii digit h to a binary integer
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******************************************************************************/
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static
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int
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fromhex( h )
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int h;
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{
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if (h >= '0' && h <= '9'){
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h -= '0';
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} else if (h >= 'a' && h <= 'f'){
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h -= 'a' - 10;
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} else {
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h = 0;
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}
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return (h & 0xff);
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}
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/******************************************************************************
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* hexbin:
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* Convert a string of ASCII hex digits to a string of binary bytes.
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******************************************************************************/
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static
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hexbin( n, hexp, binp )
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int n; /* Number of bytes to convert (twice this many digits)*/
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char *hexp; /* Get hex from here */
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char *binp; /* Put binary here */
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{
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while ( n-- ){
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*binp++ = (fromhex(*hexp) << 4) | fromhex(*(hexp+1));
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hexp += 2;
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}
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}
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/******************************************************************************
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* binhex:
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* Convert a string of binary bytes to a string of ASCII hex digits
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******************************************************************************/
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static
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binhex( n, binp, hexp )
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int n; /* Number of bytes to convert */
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char *binp; /* Get binary from here */
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char *hexp; /* Place hex here */
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{
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static char tohex[] = "0123456789abcdef";
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while ( n-- ){
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*hexp++ = tohex[ (*binp >> 4) & 0xf ];
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*hexp++ = tohex[ *binp & 0xf ];
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binp++;
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}
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}
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/******************************************************************************
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* byte_order:
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* If the host byte order is different from 960 byte order (i.e., the
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* host is big-endian), reverse the bytes in the passed value; otherwise,
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* return the passed value unchanged.
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*
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******************************************************************************/
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static
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long
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byte_order( n )
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long n;
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{
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long rev;
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int i;
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static short test = 0x1234;
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if (*((char *) &test) == 0x12) {
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/*
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* Big-endian host, swap the bytes.
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*/
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rev = 0;
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for ( i = 0; i < sizeof(n); i++ ){
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rev <<= 8;
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rev |= n & 0xff;
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n >>= 8;
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}
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n = rev;
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}
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return n;
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}
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/******************************************************************************
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* say:
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* This is a printf that takes at most two arguments (in addition to the
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* format string) and that outputs nothing if verbose output has been
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* suppressed.
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******************************************************************************/
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static
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say( fmt, arg1, arg2 )
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char *fmt;
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int arg1, arg2;
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{
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if ( !quiet ){
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printf( fmt, arg1, arg2 );
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fflush( stdout );
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}
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}
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/*****************************
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* *
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* LOW-LEVEL COMMUNICATION *
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* *
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*****************************/
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/* Read a single character from the remote end. */
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static int
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readchar()
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{
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/* FIXME: Do we really want to be reading without a timeout? */
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return SERIAL_READCHAR (nindy_serial, -1);
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}
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/******************************************************************************
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* getpkt:
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* Read a packet from a remote NINDY, with error checking, and return
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* it in the indicated buffer.
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******************************************************************************/
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static
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getpkt (buf)
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char *buf;
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{
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unsigned char recv; /* Checksum received */
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unsigned char csum; /* Checksum calculated */
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char *bp; /* Poointer into the buffer */
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int c;
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while (1){
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csum = 0;
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bp = buf;
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/* FIXME: check for error from readchar (). */
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while ( (c = readchar()) != '#' ){
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*bp++ = c;
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csum += c;
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}
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*bp = 0;
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/* FIXME: check for error from readchar (). */
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recv = fromhex(readchar()) << 4;
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recv |= fromhex(readchar());
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if ( csum == recv ){
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break;
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}
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fprintf(stderr,
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"Bad checksum (recv=0x%02x; calc=0x%02x); retrying\r\n",
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recv, csum );
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SERIAL_WRITE (nindy_serial, "-", 1);
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}
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SERIAL_WRITE (nindy_serial, "+", 1);
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}
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/******************************************************************************
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* putpkt:
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* Checksum and send a gdb command to a remote NINDY, and wait for
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* positive acknowledgement.
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*
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******************************************************************************/
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static
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putpkt( cmd )
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char *cmd; /* Command to be sent, without lead ^P (\020)
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* or trailing checksum
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*/
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{
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char ack; /* Response received from NINDY */
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char checksum[4];
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char *p;
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unsigned int s;
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char resend;
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for ( s='\020', p=cmd; *p; p++ ){
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s += *p;
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}
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sprintf( checksum, "#%02x", s & 0xff );
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/* Send checksummed message over and over until we get a positive ack
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*/
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resend = 1;
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do {
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if ( resend ) {
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SERIAL_WRITE ( nindy_serial, "\020", 1 );
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SERIAL_WRITE( nindy_serial, cmd, strlen(cmd) );
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SERIAL_WRITE( nindy_serial, checksum, strlen(checksum) );
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}
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/* FIXME: do we really want to be reading without timeout? */
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ack = SERIAL_READCHAR (nindy_serial, -1);
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if (ack < 0)
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{
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fprintf (stderr, "error reading from serial port\n");
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}
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if ( ack == '-' ){
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fprintf( stderr, "Remote NAK, resending\r\n" );
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resend = 1;
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} else if ( ack != '+' ){
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fprintf( stderr, "Bad ACK, ignored: <%c>\r\n", ack );
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resend = 0;
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}
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} while ( ack != '+' );
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}
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/******************************************************************************
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* send:
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* Send a message to a remote NINDY and return the reply in the same
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* buffer (clobbers the input message). Check for error responses
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* as indicated by the second argument.
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*
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******************************************************************************/
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static
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send( buf, ack_required )
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char *buf; /* Message to be sent to NINDY; replaced by
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* NINDY's response.
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*/
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int ack_required; /* 1 means NINDY's response MUST be either "X00" (no
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* error) or an error code "Xnn".
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* 0 means the it's OK as long as it doesn't
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* begin with "Xnn".
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*/
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{
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int errnum;
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static char *errmsg[] = {
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"", /* X00 */
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"Buffer overflow", /* X01 */
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"Unknown command", /* X02 */
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"Wrong amount of data to load register(s)", /* X03 */
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"Missing command argument(s)", /* X04 */
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"Odd number of digits sent to load memory", /* X05 */
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"Unknown register name", /* X06 */
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"No such memory segment", /* X07 */
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"No breakpoint available", /* X08 */
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"Can't set requested baud rate", /* X09 */
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};
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# define NUMERRS ( sizeof(errmsg) / sizeof(errmsg[0]) )
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static char err0[] = "NINDY failed to acknowledge command: <%s>\r\n";
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static char err1[] = "Unknown error response from NINDY: <%s>\r\n";
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static char err2[] = "Error response %s from NINDY: %s\r\n";
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putpkt (buf);
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getpkt (buf);
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if ( buf[0] != 'X' ){
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if ( ack_required ){
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fprintf( stderr, err0, buf );
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abort();
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}
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} else if ( strcmp(buf,"X00") ){
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sscanf( &buf[1], "%x", &errnum );
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if ( errnum > NUMERRS ){
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fprintf( stderr, err1, buf );
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} else{
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fprintf( stderr, err2, buf, errmsg[errnum] );
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}
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abort();
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}
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}
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/**********************************
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* *
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* NINDY INTERFACE ROUTINES *
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* *
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* ninConnect *MUST* be the first *
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* one of these routines called. *
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**********************************/
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/******************************************************************************
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* ninBptDel:
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* Ask NINDY to delete the specified type of *hardware* breakpoint at
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* the specified address. If the 'addr' is -1, all breakpoints of
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* the specified type are deleted.
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******************************************************************************/
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OninBptDel( addr, data )
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long addr; /* Address in 960 memory */
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int data; /* '1' => data bkpt, '0' => instruction breakpoint */
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{
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char buf[100];
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if ( addr == -1 ){
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sprintf( buf, "b%c", data ? '1' : '0' );
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} else {
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sprintf( buf, "b%c%x", data ? '1' : '0', addr );
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}
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return send( buf, 0 );
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}
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/******************************************************************************
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* ninBptSet:
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* Ask NINDY to set the specified type of *hardware* breakpoint at
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* the specified address.
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******************************************************************************/
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OninBptSet( addr, data )
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long addr; /* Address in 960 memory */
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int data; /* '1' => data bkpt, '0' => instruction breakpoint */
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{
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char buf[100];
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sprintf( buf, "B%c%x", data ? '1' : '0', addr );
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return send( buf, 0 );
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}
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/******************************************************************************
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* ninGdbExit:
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* Ask NINDY to leave GDB mode and print a NINDY prompt.
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* Since it'll no longer be in GDB mode, don't wait for a response.
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******************************************************************************/
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OninGdbExit()
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{
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putpkt( "E" );
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}
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/******************************************************************************
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* ninGo:
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* Ask NINDY to start or continue execution of an application program
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* in it's memory at the current ip.
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******************************************************************************/
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OninGo( step_flag )
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int step_flag; /* 1 => run in single-step mode */
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{
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putpkt( step_flag ? "s" : "c" );
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}
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/******************************************************************************
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* ninMemGet:
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* Read a string of bytes from NINDY's address space (960 memory).
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******************************************************************************/
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OninMemGet(ninaddr, hostaddr, len)
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long ninaddr; /* Source address, in the 960 memory space */
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char *hostaddr; /* Destination address, in our memory space */
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int len; /* Number of bytes to read */
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{
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/* How much do we send at a time? */
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#define OLD_NINDY_MEMBYTES 1024
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/* Buffer: hex in, binary out */
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char buf[2*OLD_NINDY_MEMBYTES+20];
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int cnt; /* Number of bytes in next transfer */
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for ( ; len > 0; len -= OLD_NINDY_MEMBYTES ){
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cnt = len > OLD_NINDY_MEMBYTES ? OLD_NINDY_MEMBYTES : len;
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sprintf( buf, "m%x,%x", ninaddr, cnt );
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send( buf, 0 );
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hexbin( cnt, buf, hostaddr );
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ninaddr += cnt;
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hostaddr += cnt;
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}
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}
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/******************************************************************************
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* ninMemPut:
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* Write a string of bytes into NINDY's address space (960 memory).
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******************************************************************************/
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OninMemPut( destaddr, srcaddr, len )
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long destaddr; /* Destination address, in NINDY memory space */
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char *srcaddr; /* Source address, in our memory space */
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int len; /* Number of bytes to write */
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{
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char buf[2*OLD_NINDY_MEMBYTES+20]; /* Buffer: binary in, hex out */
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char *p; /* Pointer into buffer */
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int cnt; /* Number of bytes in next transfer */
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for ( ; len > 0; len -= OLD_NINDY_MEMBYTES ){
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cnt = len > OLD_NINDY_MEMBYTES ? OLD_NINDY_MEMBYTES : len;
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sprintf( buf, "M%x,", destaddr );
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p = buf + strlen(buf);
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binhex( cnt, srcaddr, p );
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*(p+(2*cnt)) = '\0';
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send( buf, 1 );
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srcaddr += cnt;
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destaddr += cnt;
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}
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}
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/******************************************************************************
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* ninRegGet:
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* Retrieve the contents of a 960 register, and return them as a long
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* in host byte order.
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*
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* THIS ROUTINE CAN ONLY BE USED TO READ THE LOCAL, GLOBAL, AND
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* ip/ac/pc/tc REGISTERS.
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*
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******************************************************************************/
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long
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OninRegGet( regname )
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char *regname; /* Register name recognized by NINDY, subject to the
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* above limitations.
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*/
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{
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char buf[200];
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long val;
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sprintf( buf, "u%s", regname );
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send( buf, 0 );
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hexbin( 4, buf, (char *)&val );
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return byte_order(val);
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}
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/******************************************************************************
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* ninRegPut:
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* Set the contents of a 960 register.
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*
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* THIS ROUTINE CAN ONLY BE USED TO SET THE LOCAL, GLOBAL, AND
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* ip/ac/pc/tc REGISTERS.
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*
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******************************************************************************/
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OninRegPut( regname, val )
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char *regname; /* Register name recognized by NINDY, subject to the
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* above limitations.
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*/
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long val; /* New contents of register, in host byte-order */
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{
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char buf[200];
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sprintf( buf, "U%s,%08x", regname, byte_order(val) );
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send( buf, 1 );
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}
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/******************************************************************************
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* ninRegsGet:
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* Get a dump of the contents of the entire 960 register set. The
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* individual registers appear in the dump in the following order:
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*
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* pfp sp rip r3 r4 r5 r6 r7
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* r8 r9 r10 r11 r12 r13 r14 r15
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* g0 g1 g2 g3 g4 g5 g6 g7
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* g8 g9 g10 g11 g12 g13 g14 fp
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* pc ac ip tc fp0 fp1 fp2 fp3
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*
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* Each individual register comprises exactly 4 bytes, except for
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* fp0-fp3, which are 8 bytes.
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*
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* WARNING:
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* Each register value is in 960 (little-endian) byte order.
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*
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******************************************************************************/
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OninRegsGet( regp )
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char *regp; /* Where to place the register dump */
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{
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char buf[(2*OLD_NINDY_REGISTER_BYTES)+10]; /* Registers in ASCII hex */
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strcpy( buf, "r" );
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send( buf, 0 );
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hexbin( OLD_NINDY_REGISTER_BYTES, buf, regp );
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}
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/******************************************************************************
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* ninRegsPut:
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* Initialize the entire 960 register set to a specified set of values.
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* The format of the register value data should be the same as that
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* returned by ninRegsGet.
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*
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* WARNING:
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* Each register value should be in 960 (little-endian) byte order.
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*
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******************************************************************************/
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OninRegsPut( regp )
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char *regp; /* Pointer to desired values of registers */
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{
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char buf[(2*OLD_NINDY_REGISTER_BYTES)+10]; /* Registers in ASCII hex */
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buf[0] = 'R';
|
||
binhex( OLD_NINDY_REGISTER_BYTES, regp, buf+1 );
|
||
buf[ (2*OLD_NINDY_REGISTER_BYTES)+1 ] = '\0';
|
||
|
||
send( buf, 1 );
|
||
}
|
||
|
||
|
||
/******************************************************************************
|
||
* ninReset:
|
||
* Ask NINDY to perform a soft reset; wait for the reset to complete.
|
||
******************************************************************************/
|
||
OninReset()
|
||
{
|
||
|
||
putpkt( "X" );
|
||
/* FIXME: check for error from readchar (). */
|
||
while ( readchar() != '+' ){
|
||
;
|
||
}
|
||
}
|
||
|
||
|
||
/******************************************************************************
|
||
* ninSrq:
|
||
* Assume NINDY has stopped execution of the 960 application program in
|
||
* order to process a host service request (srq). Ask NINDY for the
|
||
* srq arguments, perform the requested service, and send an "srq
|
||
* complete" message so NINDY will return control to the application.
|
||
*
|
||
******************************************************************************/
|
||
OninSrq()
|
||
{
|
||
/* FIXME: Imposes arbitrary limits on lengths of pathnames and such. */
|
||
char buf[BUFSIZE];
|
||
int retcode;
|
||
unsigned char srqnum;
|
||
char *p;
|
||
char *argp;
|
||
int nargs;
|
||
int arg[MAX_SRQ_ARGS];
|
||
|
||
|
||
/* Get srq number and arguments
|
||
*/
|
||
strcpy( buf, "!" );
|
||
send( buf, 0 );
|
||
hexbin( 1, buf, (char *)&srqnum );
|
||
|
||
/* Set up array of pointers the each of the individual
|
||
* comma-separated args
|
||
*/
|
||
nargs=0;
|
||
argp = p = buf+2;
|
||
while ( 1 ){
|
||
while ( *p != ',' && *p != '\0' ){
|
||
p++;
|
||
}
|
||
sscanf( argp, "%x", &arg[nargs++] );
|
||
if ( *p == '\0' || nargs == MAX_SRQ_ARGS ){
|
||
break;
|
||
}
|
||
argp = ++p;
|
||
}
|
||
|
||
/* Process Srq
|
||
*/
|
||
switch( srqnum ){
|
||
case BS_CLOSE:
|
||
/* args: file descriptor */
|
||
if ( arg[0] > 2 ){
|
||
retcode = close( arg[0] );
|
||
} else {
|
||
retcode = 0;
|
||
}
|
||
break;
|
||
case BS_CREAT:
|
||
/* args: filename, mode */
|
||
OninStrGet( arg[0], buf );
|
||
retcode = creat(buf,arg[1]);
|
||
break;
|
||
case BS_OPEN:
|
||
/* args: filename, flags, mode */
|
||
OninStrGet( arg[0], buf );
|
||
retcode = open(buf,arg[1],arg[2]);
|
||
break;
|
||
case BS_READ:
|
||
/* args: file descriptor, buffer, count */
|
||
retcode = read(arg[0],buf,arg[2]);
|
||
if ( retcode > 0 ){
|
||
OninMemPut( arg[1], buf, retcode );
|
||
}
|
||
break;
|
||
case BS_SEEK:
|
||
/* args: file descriptor, offset, whence */
|
||
retcode = lseek(arg[0],arg[1],arg[2]);
|
||
break;
|
||
case BS_WRITE:
|
||
/* args: file descriptor, buffer, count */
|
||
OninMemGet( arg[1], buf, arg[2] );
|
||
retcode = write(arg[0],buf,arg[2]);
|
||
break;
|
||
default:
|
||
retcode = -1;
|
||
break;
|
||
}
|
||
|
||
/* Tell NINDY to continue
|
||
*/
|
||
sprintf( buf, "e%x", retcode );
|
||
send( buf, 1 );
|
||
}
|
||
|
||
|
||
/******************************************************************************
|
||
* ninStopWhy:
|
||
* Assume the application program has stopped (i.e., a DLE was received
|
||
* from NINDY). Ask NINDY for status information describing the
|
||
* reason for the halt.
|
||
*
|
||
* Returns a non-zero value if the user program has exited, 0 otherwise.
|
||
* Also returns the following information, through passed pointers:
|
||
* - why: an exit code if program the exited; otherwise the reason
|
||
* why the program halted (see stop.h for values).
|
||
* - contents of register ip (little-endian byte order)
|
||
* - contents of register sp (little-endian byte order)
|
||
* - contents of register fp (little-endian byte order)
|
||
******************************************************************************/
|
||
char
|
||
OninStopWhy( whyp, ipp, fpp, spp )
|
||
char *whyp; /* Return the 'why' code through this pointer */
|
||
char *ipp; /* Return contents of register ip through this pointer */
|
||
char *fpp; /* Return contents of register fp through this pointer */
|
||
char *spp; /* Return contents of register sp through this pointer */
|
||
{
|
||
char buf[30];
|
||
char stop_exit;
|
||
|
||
strcpy( buf, "?" );
|
||
send( buf, 0 );
|
||
hexbin( 1, buf, &stop_exit );
|
||
hexbin( 1, buf+2, whyp );
|
||
hexbin( 4, buf+4, ipp );
|
||
hexbin( 4, buf+12, fpp );
|
||
hexbin( 4, buf+20, spp );
|
||
return stop_exit;
|
||
}
|
||
|
||
/******************************************************************************
|
||
* ninStrGet:
|
||
* Read a '\0'-terminated string of data out of the 960 memory space.
|
||
*
|
||
******************************************************************************/
|
||
static
|
||
OninStrGet( ninaddr, hostaddr )
|
||
unsigned long ninaddr; /* Address of string in NINDY memory space */
|
||
char *hostaddr; /* Address of the buffer to which string should
|
||
* be copied.
|
||
*/
|
||
{
|
||
/* FIXME: seems to be an arbitrary limit on the length of the string. */
|
||
char buf[BUFSIZE]; /* String as 2 ASCII hex digits per byte */
|
||
int numchars; /* Length of string in bytes. */
|
||
|
||
sprintf( buf, "\"%x", ninaddr );
|
||
send( buf, 0 );
|
||
numchars = strlen(buf)/2;
|
||
hexbin( numchars, buf, hostaddr );
|
||
hostaddr[numchars] = '\0';
|
||
}
|
||
|
||
#if 0
|
||
/* never used. */
|
||
|
||
/******************************************************************************
|
||
* ninVersion:
|
||
* Ask NINDY for version information about itself.
|
||
* The information is sent as an ascii string in the form "x.xx,<arch>",
|
||
* where,
|
||
* x.xx is the version number
|
||
* <arch> is the processor architecture: "KA", "KB", "MC", "CA" *
|
||
*
|
||
******************************************************************************/
|
||
int
|
||
OninVersion( p )
|
||
char *p; /* Where to place version string */
|
||
{
|
||
/* FIXME: this is an arbitrary limit on the length of version string. */
|
||
char buf[BUFSIZE];
|
||
|
||
strcpy( buf, "v" );
|
||
send( buf, 0 );
|
||
strcpy( p, buf );
|
||
return strlen( buf );
|
||
}
|
||
#endif
|