/* 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.
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Remote communication protocol.
+
+ A debug packet whose contents are <data>
+ is encapsulated for transmission in the form:
+
+ $ <data> # CSUM1 CSUM2
+
+ <data> must be ASCII alphanumeric and cannot include characters
+ '$' or '#'
+
+ CSUM1 and CSUM2 are ascii hex representation of an 8-bit
+ checksum of <data>, the most significant nibble is sent first.
+ the hex digits 0-9,a-f are used.
+
+ Receiver responds with:
+
+ + - if CSUM is correct and ready for next packet
+ - - if CSUM is incorrect
+
+ <data> is as follows:
All values are encoded in ascii hex digits.
Request Packet
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).
+ or... TAAn...:r...;n:r...;n...:r...;
+ AA = signal number
+ n... = register number
+ r... = register contents
kill req k
*/
#include <fcntl.h>
#include "frame.h"
#include "inferior.h"
+#include "bfd.h"
+#include "symfile.h"
#include "target.h"
#include "wait.h"
#include "terminal.h"
#endif
#include <signal.h>
+#include "serial.h"
/* Prototypes for local functions */
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 *));
static void
remote_detach PARAMS ((char *, int));
-
extern struct target_ops remote_ops; /* Forward decl */
static int kiodebug = 0;
-static int timeout = 5;
+/* This was 5 seconds, which is a long time to sit and wait.
+ Unless this is going though some terminal server or multiplexer or
+ other form of hairy serial connection, I would think 2 seconds would
+ be plenty. */
+static int timeout = 2;
#if 0
int icache;
#endif
-/* Descriptor for I/O to remote machine. Initialize it to -1 so that
+/* Descriptor for I/O to remote machine. Initialize it to NULL so that
remote_open knows that we don't have a file open when the program
starts. */
-int remote_desc = -1;
+serial_t remote_desc = NULL;
#define PBUFSIZ 1024
#define PBUFSIZ (REGISTER_BYTES * 2 + 32)
#endif
\f
-/* Called when SIGALRM signal sent due to alarm() timeout. */
-#ifndef HAVE_TERMIO
-void
-remote_timer (signo)
- int signo;
-{
- if (kiodebug)
- printf ("remote_timer called\n");
-
- alarm (timeout);
-}
-#endif
-
/* Clean up connection to a remote debugger. */
/* ARGSUSED */
remote_close (quitting)
int quitting;
{
- if (remote_desc >= 0)
- close (remote_desc);
- remote_desc = -1;
+ if (remote_desc)
+ SERIAL_CLOSE (remote_desc);
+ remote_desc = NULL;
}
-/* Translate baud rates from integers to damn B_codes. Unix should
- have outgrown this crap years ago, but even POSIX wouldn't buck it. */
-
-#ifndef B19200
-#define B19200 EXTA
-#endif
-#ifndef B38400
-#define B38400 EXTB
-#endif
-
-
-
-static struct {int rate, damn_b;} baudtab[] = {
- {0, B0},
- {50, B50},
- {75, B75},
- {110, B110},
- {134, B134},
- {150, B150},
- {200, B200},
- {300, B300},
- {600, B600},
- {1200, B1200},
- {1800, B1800},
- {2400, B2400},
- {4800, B4800},
- {9600, B9600},
- {19200, B19200},
- {38400, B38400},
- {-1, -1},
-};
+/* Stub for catch_errors. */
static int
-damn_b (rate)
- int rate;
+remote_start_remote (dummy)
+ char *dummy;
{
- int i;
+ /* Ack any packet which the remote side has already sent. */
+ /* I'm not sure this \r is needed; we don't use it any other time we
+ send an ack. */
+ SERIAL_WRITE (remote_desc, "+\r", 2);
+ putpkt ("?"); /* initiate a query from remote machine */
- for (i = 0; baudtab[i].rate != -1; i++)
- if (rate == baudtab[i].rate) return baudtab[i].damn_b;
- return B38400; /* Random */
+ start_remote (); /* Initialize gdb process mechanisms */
+ return 1;
}
/* Open a connection to a remote debugger.
char *name;
int from_tty;
{
- TERMINAL sg;
- int a_rate, b_rate = 0;
- int baudrate_set = 0;
-
if (name == 0)
error (
"To open a remote debug connection, you need to specify what serial\n\
target_preopen (from_tty);
- remote_close (0);
+ unpush_target (&remote_ops);
#if 0
dcache_init ();
#endif
- remote_desc = open (name, O_RDWR);
- if (remote_desc < 0)
+ remote_desc = SERIAL_OPEN (name);
+ if (!remote_desc)
perror_with_name (name);
if (baud_rate)
{
- if (1 != sscanf (baud_rate, "%d ", &a_rate))
- {
- b_rate = damn_b (a_rate);
- baudrate_set = 1;
- }
- }
+ int rate;
- ioctl (remote_desc, TIOCGETP, &sg);
-#ifdef HAVE_TERMIO
- sg.c_cc[VMIN] = 0; /* read with timeout. */
- sg.c_cc[VTIME] = timeout * 10;
- sg.c_lflag &= ~(ICANON | ECHO);
- sg.c_cflag &= ~PARENB; /* No parity */
- sg.c_cflag |= CS8; /* 8-bit path */
- if (baudrate_set)
- sg.c_cflag = (sg.c_cflag & ~CBAUD) | b_rate;
-#else
- sg.sg_flags |= RAW | ANYP;
- sg.sg_flags &= ~ECHO;
- if (baudrate_set)
- {
- sg.sg_ispeed = b_rate;
- sg.sg_ospeed = b_rate;
+ if (sscanf (baud_rate, "%d", &rate) == 1)
+ if (SERIAL_SETBAUDRATE (remote_desc, rate))
+ {
+ SERIAL_CLOSE (remote_desc);
+ perror_with_name (name);
+ }
}
-#endif
- ioctl (remote_desc, TIOCSETP, &sg);
+
+ SERIAL_RAW (remote_desc);
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
-#ifndef NO_SIGINTERRUPT
- /* Cause SIGALRM's to make reads fail. */
- if (siginterrupt (SIGALRM, 1) != 0)
- perror ("remote_open: error in siginterrupt");
-#endif
-
- /* Set up read timeout timer. */
- if ((void (*)()) signal (SIGALRM, remote_timer) == (void (*)()) -1)
- perror ("remote_open: error in signal");
-#endif
-
- /* 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 */
+ /* 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", RETURN_MASK_ALL))
+ 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. Try `handle %d ignore'.",
- siggnal);
+ {
+ char *name;
+ target_terminal_ours_for_output ();
+ printf_filtered ("Can't send signals to a remote system. ");
+ name = strsigno (siggnal);
+ if (name)
+ printf_filtered (name);
+ else
+ printf_filtered ("Signal %d", siggnal);
+ printf_filtered (" not sent.\n");
+ target_terminal_inferior ();
+ }
#if 0
dcache_flush ();
putpkt (buf);
}
+\f
+static void remote_interrupt_twice PARAMS ((int));
+static void (*ofunc)();
/* Send ^C to target to halt it. Target will respond, and send us a
packet. */
void remote_interrupt(signo)
int signo;
{
+ /* If this doesn't work, try more severe steps. */
+ signal (signo, remote_interrupt_twice);
if (kiodebug)
printf ("remote_interrupt called\n");
- write (remote_desc, "\003", 1); /* Send a ^C */
+ SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */
}
+/* The user typed ^C twice. */
+static void
+remote_interrupt_twice (signo)
+ int signo;
+{
+ signal (signo, ofunc);
+
+ target_terminal_ours ();
+ if (query ("Interrupted while waiting for the program.\n\
+Give up (and stop debugging it)? "))
+ {
+ target_mourn_inferior ();
+ return_to_top_level (RETURN_QUIT);
+ }
+ else
+ {
+ signal (signo, remote_interrupt);
+ target_terminal_inferior ();
+ }
+}
/* Wait until the remote machine stops, then return,
storing status in STATUS just as `wait' would.
WAITTYPE *status;
{
unsigned char buf[PBUFSIZ];
- void (*ofunc)();
unsigned char *p;
int i;
- char regs[REGISTER_RAW_SIZE (PC_REGNUM) + REGISTER_RAW_SIZE (FP_REGNUM)];
+ long regno;
+ char regs[MAX_REGISTER_RAW_SIZE];
WSETEXIT ((*status), 0);
- ofunc = (void (*)) 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] == 'T')
{
- /* Expedited reply, containing Signal, PC, and FP. */
+ /* 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 */
- for (i = 0; i < sizeof (regs); i++)
+
+ while (*p)
{
- 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;
+ 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);
}
- supply_register (PC_REGNUM, ®s[0]);
- supply_register (FP_REGNUM, ®s[REGISTER_RAW_SIZE (PC_REGNUM)]);
}
else if (buf[0] != 'S')
error ("Invalid remote reply: %s", buf);
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.
remote_files_info (ignore)
struct target_ops *ignore;
{
- printf ("Debugging a target over a serial line.\n");
+ puts_filtered ("Debugging a target over a serial line.\n");
}
\f
-/*
-
-A debug packet whose contents are <data>
-is encapsulated for transmission in the form:
-
- $ <data> # CSUM1 CSUM2
+/* Stuff for dealing with the packets which are part of this protocol.
+ See comment at top of file for details. */
- <data> must be ASCII alphanumeric and cannot include characters
- '$' or '#'
-
- CSUM1 and CSUM2 are ascii hex representation of an 8-bit
- checksum of <data>, the most significant nibble is sent first.
- the hex digits 0-9,a-f are used.
-
-Receiver responds with:
-
- + - if CSUM is correct and ready for next packet
- - - if CSUM is incorrect
-
-*/
-
-/* Read a single character from the remote end.
- (If supported, we actually read many characters and buffer them up.) */
+/* Read a single character from the remote end, masking it down to 7 bits. */
static int
readchar ()
{
- static int inbuf_index, inbuf_count;
-#define INBUFSIZE PBUFSIZ
- static char inbuf[INBUFSIZE];
+ int ch;
- if (inbuf_index >= inbuf_count)
- {
- /* Time to do another read... */
- inbuf_index = 0;
- inbuf_count = 0;
- inbuf[0] = 0; /* Just in case */
-#ifdef HAVE_TERMIO
- /* termio does the timeout for us. */
- inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
-#else
- alarm (timeout);
- inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
- alarm (0);
-#endif
- }
+ ch = SERIAL_READCHAR (remote_desc, timeout);
- /* Just return the next character from the buffer. */
- return inbuf[inbuf_index++] & 0x7f;
+ if (ch < 0)
+ return ch;
+
+ return ch & 0x7f;
}
/* Send the command in BUF to the remote machine,
{
putpkt (buf);
- getpkt (buf);
+ getpkt (buf, 0);
if (buf[0] == 'E')
error ("Remote failure reply: %s", buf);
unsigned char csum = 0;
char buf2[PBUFSIZ];
int cnt = strlen (buf);
- char ch;
+ int ch;
char *p;
/* Copy the packet into buffer BUF2, encapsulating it
/* Send it over and over until we get a positive ack. */
- do {
- if (kiodebug)
- {
- *p = '\0';
- 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 != '+');
+ while (1)
+ {
+ if (kiodebug)
+ {
+ *p = '\0';
+ printf ("Sending packet: %s...", buf2); fflush(stdout);
+ }
+ if (SERIAL_WRITE (remote_desc, buf2, p - buf2))
+ perror_with_name ("putpkt: write failed");
+
+ /* read until either a timeout occurs (-2) or '+' is read */
+ while (1)
+ {
+ ch = readchar ();
+
+ switch (ch)
+ {
+ case '+':
+ if (kiodebug)
+ printf("Ack\n");
+ return;
+ case SERIAL_TIMEOUT:
+ break; /* Retransmit buffer */
+ case SERIAL_ERROR:
+ perror_with_name ("putpkt: couldn't read ACK");
+ case SERIAL_EOF:
+ error ("putpkt: EOF while trying to read ACK");
+ default:
+ if (kiodebug)
+ printf ("%02X %c ", ch&0xFF, ch);
+ continue;
+ }
+ break; /* Here to retransmit */
+ }
+ }
}
/* Read a packet from the remote machine, with error checking,
- and store it in BUF. BUF is expected to be of size PBUFSIZ. */
+ 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;
+ int forever;
{
char *bp;
unsigned char csum;
- int c;
+ int c = 0;
unsigned char c1, c2;
-
-#if 0
- /* Sorry, this will cause all hell to break loose, i.e. we'll end
- up in the command loop with an inferior, but (at least if this
- happens in remote_wait or some such place) without a current_frame,
- having set up prev_* in wait_for_inferior, etc.
-
- If it is necessary to have such an "emergency exit", seems like
- the only plausible thing to do is to say the inferior died, and
- make the user reattach if they want to. Perhaps with a prompt
- asking for confirmation. */
-
- /* allow immediate quit while reading from device, it could be hung */
- immediate_quit++;
-#endif /* 0 */
+ int retries = 0;
+#define MAX_RETRIES 10
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. */
+
+ c = readchar();
+ if (c > 0 && c != '$')
+ continue;
+
+ if (c == SERIAL_TIMEOUT)
+ {
+ if (forever)
+ continue;
+ if (++retries >= MAX_RETRIES)
+ if (kiodebug) puts_filtered ("Timed out.\n");
+ goto out;
+ }
+
+ if (c == SERIAL_EOF)
+ error ("Remote connection closed");
+ if (c == SERIAL_ERROR)
+ perror_with_name ("Remote communication error");
+
/* Force csum to be zero here because of possible error retry. */
csum = 0;
-
- while ((c = readchar()) != '$');
-
bp = buf;
+
while (1)
{
c = readchar ();
+ if (c == SERIAL_TIMEOUT)
+ {
+ if (kiodebug)
+ puts_filtered ("Timeout in mid-packet, retrying\n");
+ goto whole; /* Start a new packet, count retries */
+ }
+ if (c == '$')
+ {
+ 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';
- printf_filtered ("Remote packet too long: %s\n", buf);
+ puts_filtered ("Remote packet too long: ");
+ puts_filtered (buf);
+ puts_filtered ("\n");
goto whole;
}
*bp++ = c;
c2 = fromhex (readchar ());
if ((csum & 0xff) == (c1 << 4) + c2)
break;
- printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
- (c1 << 4) + c2, csum & 0xff, buf);
+ 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:
- write (remote_desc, "-", 1);
+ if (++retries < MAX_RETRIES)
+ {
+ SERIAL_WRITE (remote_desc, "-", 1);
+ }
+ else
+ {
+ printf ("Ignoring packet error, continuing...\n");
+ break;
+ }
}
-#if 0
- immediate_quit--;
-#endif
+out:
- write (remote_desc, "+", 1);
+ SERIAL_WRITE (remote_desc, "+", 1);
if (kiodebug)
fprintf (stderr,"Packet received: %s\n", buf);
insque (db, &dcache_free);
}
#endif /* 0 */
+\f
+static void
+remote_kill ()
+{
+ putpkt ("k");
+ /* Don't wait for it to die. I'm not really sure it matters whether
+ we do or not. For the existing stubs, kill is a noop. */
+ target_mourn_inferior ();
+}
+static void
+remote_mourn ()
+{
+ unpush_target (&remote_ops);
+ generic_mourn_inferior ();
+}
+\f
/* Define the target subroutine names */
struct target_ops remote_ops = {
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_terminal_ours_for_output */
NULL, /* to_terminal_ours */
NULL, /* to_terminal_info */
- NULL, /* to_kill */
- NULL, /* to_load */
+ remote_kill, /* to_kill */
+ generic_load, /* to_load */
NULL, /* to_lookup_symbol */
NULL, /* to_create_inferior */
- NULL, /* to_mourn_inferior */
+ remote_mourn, /* to_mourn_inferior */
+ 0, /* to_can_run */
+ 0, /* to_notice_signals */
process_stratum, /* to_stratum */
NULL, /* to_next */
1, /* to_has_all_memory */
projects / deliverable / binutils-gdb.git / blobdiff