/* Remote target communications for serial-line targets in custom GDB protocol
- Copyright 1988, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1988, 1991, 1992, 1993 Free Software Foundation, Inc.
This file is part of GDB.
The reply comes when the machine stops.
It is SAA AA is the "signal number"
+ or... TAAPPPPPPPPFFFFFFFF
+ where AA is the signal number,
+ PPPPPPPP is the PC (PC_REGNUM), and
+ FFFFFFFF is the frame ptr (FP_REGNUM).
+
kill req k
*/
-#include <stdio.h>
+#include "defs.h"
#include <string.h>
#include <fcntl.h>
-#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"
#include "wait.h"
#include "terminal.h"
+#include "gdbcmd.h"
+#if !defined(DONT_USE_REMOTE)
#ifdef USG
#include <sys/types.h>
#endif
static void
remote_resume PARAMS ((int, int));
+static int
+remote_start_remote PARAMS ((char *));
+
static void
remote_open PARAMS ((char *, int));
remote_store_registers PARAMS ((int));
static void
-getpkt PARAMS ((char *));
+getpkt PARAMS ((char *, int));
static void
putpkt PARAMS ((char *));
extern struct target_ops remote_ops; /* Forward decl */
-static int kiodebug;
+static int kiodebug = 0;
static int timeout = 5;
#if 0
/* Called when SIGALRM signal sent due to alarm() timeout. */
#ifndef HAVE_TERMIO
void
-remote_timer ()
+remote_timer (signo)
+ int signo;
{
if (kiodebug)
printf ("remote_timer called\n");
#define B38400 EXTB
#endif
+
+
static struct {int rate, damn_b;} baudtab[] = {
{0, B0},
{50, B50},
return B38400; /* Random */
}
+/* Stub for catch_errors. */
+
+static int
+remote_start_remote (dummy)
+ char *dummy;
+{
+ /* Ack any packet which the remote side has already sent. */
+ write (remote_desc, "+\r", 2);
+ putpkt ("?"); /* initiate a query from remote machine */
+
+ start_remote (); /* Initialize gdb process mechanisms */
+ return 1;
+}
+
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
int from_tty;
{
TERMINAL sg;
- int a_rate, b_rate;
+ int a_rate, b_rate = 0;
int baudrate_set = 0;
if (name == 0)
if (baud_rate)
{
- if (1 != sscanf (baud_rate, "%d ", &a_rate))
+ if (sscanf (baud_rate, "%d", &a_rate) == 1)
{
b_rate = damn_b (a_rate);
baudrate_set = 1;
sg.c_cflag &= ~PARENB; /* No parity */
sg.c_cflag |= CS8; /* 8-bit path */
if (baudrate_set)
- sg.c_cflag = (sb.c_cflag & ~CBAUD) | b_rate;
+ sg.c_cflag = (sg.c_cflag & ~CBAUD) | b_rate;
#else
sg.sg_flags |= RAW | ANYP;
sg.sg_flags &= ~ECHO;
ioctl (remote_desc, TIOCSETP, &sg);
if (from_tty)
- printf ("Remote debugging using %s\n", name);
+ {
+ puts_filtered ("Remote debugging using ");
+ puts_filtered (name);
+ puts_filtered ("\n");
+ }
push_target (&remote_ops); /* Switch to using remote target now */
#ifndef HAVE_TERMIO
perror ("remote_open: error in signal");
#endif
- /* Ack any packet which the remote side has already sent. */
- write (remote_desc, "+", 1);
- putpkt ("?"); /* initiate a query from remote machine */
-
- start_remote (); /* Initialize gdb process mechanisms */
+ /* Start the remote connection; if error (0), discard this target. */
+ immediate_quit++; /* Allow user to interrupt it */
+ if (!catch_errors (remote_start_remote, (char *)0,
+ "Couldn't establish connection to remote target\n"))
+ pop_target();
}
/* remote_detach()
pop_target ();
if (from_tty)
- printf ("Ending remote debugging.\n");
+ puts_filtered ("Ending remote debugging.\n");
}
/* Convert hex digit A to a number. */
char buf[PBUFSIZ];
if (siggnal)
- error ("Can't send signals to a remote system.");
+ error ("Can't send signals to a remote system. Try `handle %d ignore'.",
+ siggnal);
#if 0
dcache_flush ();
/* Send ^C to target to halt it. Target will respond, and send us a
packet. */
-void remote_interrupt()
+void remote_interrupt(signo)
+ int signo;
{
+
+ if (kiodebug)
+ printf ("remote_interrupt called\n");
+
write (remote_desc, "\003", 1); /* Send a ^C */
}
{
unsigned char buf[PBUFSIZ];
void (*ofunc)();
-
+ unsigned char *p;
+ int i;
+ long regno;
+ char regs[MAX_REGISTER_RAW_SIZE];
+
WSETEXIT ((*status), 0);
- ofunc = signal (SIGINT, remote_interrupt);
- getpkt ((char *) buf);
+ ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
+ getpkt ((char *) buf, 1);
signal (SIGINT, ofunc);
if (buf[0] == 'E')
error ("Remote failure reply: %s", buf);
- if (buf[0] != 'S')
+ if (buf[0] == 'T')
+ {
+ /* Expedited reply, containing Signal, {regno, reg} repeat */
+ /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
+ ss = signal number
+ n... = register number
+ r... = register contents
+ */
+
+ p = &buf[3]; /* after Txx */
+
+ while (*p)
+ {
+ regno = strtol (p, &p, 16); /* Read the register number */
+
+ if (*p++ != ':'
+ || regno >= NUM_REGS)
+ error ("Remote sent bad register number %s", buf);
+
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i++)
+ {
+ if (p[0] == 0 || p[1] == 0)
+ error ("Remote reply is too short: %s", buf);
+ regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+
+ if (*p++ != ';')
+ error("Remote register badly formatted: %s", buf);
+
+ supply_register (regno, regs);
+ }
+ }
+ else if (buf[0] != 'S')
error ("Invalid remote reply: %s", buf);
+
WSETSTOP ((*status), (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))));
+
return 0;
}
/* Read the remote registers into the block REGS. */
-
/* Currently we just read all the registers, so we don't use regno. */
/* ARGSUSED */
static void
static void
remote_prepare_to_store ()
{
- remote_fetch_registers (-1);
+ /* Make sure the entire registers array is valid. */
+ read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
}
/* Store the remote registers from the contents of the block REGISTERS.
}
static void
-remote_files_info (target)
-struct target_ops *target;
+remote_files_info (ignore)
+struct target_ops *ignore;
{
- printf ("remote files info missing here. FIXME.\n");
+ puts_filtered ("Debugging a target over a serial line.\n");
}
\f
/*
*/
/* Read a single character from the remote end.
- (If supported, we actually read many characters and buffer them up.) */
+ (If supported, we actually read many characters and buffer them up.)
+ Timeouts cause a zero (nul) to be returned. */
static int
readchar ()
{
- char buf;
static int inbuf_index, inbuf_count;
#define INBUFSIZE PBUFSIZ
static char inbuf[INBUFSIZE];
+ struct cleanup *old_chain;
if (inbuf_index >= inbuf_count)
{
+#ifndef HAVE_TERMIO
+ extern int alarm ();
+#endif
+
/* Time to do another read... */
inbuf_index = 0;
inbuf_count = 0;
/* termio does the timeout for us. */
inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
#else
+ /* Cancel alarm on error. */
+ old_chain = make_cleanup (alarm, (char *)0);
alarm (timeout);
inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
- alarm (0);
+ do_cleanups (old_chain); /* Cancel the alarm now. */
#endif
}
- /* Just return the next character from the buffer. */
+ /* Just return the next character from the buffer (or a zero if we
+ got an error and no chars were stored in inbuf). */
return inbuf[inbuf_index++] & 0x7f;
}
{
putpkt (buf);
- getpkt (buf);
+ getpkt (buf, 0);
if (buf[0] == 'E')
error ("Remote failure reply: %s", buf);
if (kiodebug)
{
*p = '\0';
- printf ("Sending packet: %s (%s)\n", buf2, buf);
+ printf ("Sending packet: %s...", buf2); fflush(stdout);
}
write (remote_desc, buf2, p - buf2);
/* read until either a timeout occurs (\0) or '+' is read */
do {
ch = readchar ();
+ if (kiodebug) {
+ if (ch == '+')
+ printf("Ack\n");
+ else
+ printf ("%02X%c ", ch&0xFF, ch);
+ }
} while ((ch != '+') && (ch != '\0'));
} while (ch != '+');
}
/* Read a packet from the remote machine, with error checking,
- and store it in BUF. */
+ and store it in BUF. BUF is expected to be of size PBUFSIZ.
+ If FOREVER, wait forever rather than timing out; this is used
+ while the target is executing user code. */
static void
-getpkt (buf)
+getpkt (buf, forever)
char *buf;
{
char *bp;
unsigned char csum;
- int c;
+ int c = 0;
unsigned char c1, c2;
+ int retries = 0;
+#define MAX_RETRIES 10
#if 0
/* Sorry, this will cause all hell to break loose, i.e. we'll end
while (1)
{
+ /* This can loop forever if the remote side sends us characters
+ continuously, but if it pauses, we'll get a zero from readchar
+ because of timeout. Then we'll count that as a retry. */
+ while (c != '$')
+ if (0 == (c = readchar()))
+ if (!forever)
+ {
+ if (++retries >= MAX_RETRIES)
+ if (kiodebug) puts_filtered ("Timed out.\n");
+ goto out;
+ }
+
/* Force csum to be zero here because of possible error retry. */
csum = 0;
-
- while ((c = readchar()) != '$');
-
bp = buf;
+
while (1)
{
c = readchar ();
+ if (c == '\0')
+ {
+ if (kiodebug)
+ puts_filtered ("Timeout in mid-packet, retrying\n");
+ goto whole; /* Start a new packet, count retries */
+ }
+ if (c == '$')
+ {
+ if (kiodebug)
+ puts_filtered ("Saw new packet start in middle of old one\n");
+ goto whole; /* Start a new packet, count retries */
+ }
if (c == '#')
break;
+ if (bp >= buf+PBUFSIZ-1)
+ {
+ *bp = '\0';
+ puts_filtered ("Remote packet too long: ");
+ puts_filtered (buf);
+ puts_filtered ("\n");
+ goto whole;
+ }
*bp++ = c;
csum += c;
}
c2 = fromhex (readchar ());
if ((csum & 0xff) == (c1 << 4) + c2)
break;
- printf ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
- (c1 << 4) + c2, csum & 0xff, buf);
- write (remote_desc, "-", 1);
+ printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
+ (c1 << 4) + c2, csum & 0xff);
+ puts_filtered (buf);
+ puts_filtered ("\n");
+
+ /* Try the whole thing again. */
+whole:
+ if (++retries < MAX_RETRIES)
+ {
+ write (remote_desc, "-", 1);
+ }
+ else
+ {
+ printf ("Ignoring packet error, continuing...\n");
+ break;
+ }
}
+out:
+
#if 0
immediate_quit--;
#endif
write (remote_desc, "+", 1);
if (kiodebug)
- fprintf (stderr,"Packet received :%s\n", buf);
+ fprintf (stderr,"Packet received: %s\n", buf);
}
\f
/* The data cache leads to incorrect results because it doesn't know about
remote_fetch_registers, /* to_fetch_registers */
remote_store_registers, /* to_store_registers */
remote_prepare_to_store, /* to_prepare_to_store */
- NULL, /* to_convert_to_virtual */
- NULL, /* to_convert_from_virtual */
remote_xfer_memory, /* to_xfer_memory */
remote_files_info, /* to_files_info */
NULL, /* to_insert_breakpoint */
NULL, /* to_lookup_symbol */
NULL, /* to_create_inferior */
NULL, /* to_mourn_inferior */
+ 0, /* to_can_run */
+ 0, /* to_notice_signals */
process_stratum, /* to_stratum */
NULL, /* to_next */
1, /* to_has_all_memory */
_initialize_remote ()
{
add_target (&remote_ops);
+
+ add_show_from_set (
+ add_set_cmd ("remotedebug", no_class, var_boolean, (char *)&kiodebug,
+ "Set debugging of remote serial I/O.\n\
+When enabled, each packet sent or received with the remote target\n\
+is displayed.", &setlist),
+ &showlist);
}
+
+#endif
projects / deliverable / binutils-gdb.git / blobdiff