/* Memory-access and commands for inferior process, for GDB.
- Copyright (C) 1988 Free Software Foundation, Inc.
-
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
-
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
-
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
-*/
+ Copyright (C) 1988-1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GDB is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Remote communication protocol.
All values are encoded in ascii hex digits.
If AA..AA is omitted,
resume at same address.
+ last signal ? Reply the current reason for stopping.
+ This is the same reply as is generated
+ for step or cont : SAA where AA is the
+ signal number.
+
There is no immediate reply to step or cont.
The reply comes when the machine stops.
It is SAA AA is the "signal number"
*/
#include <stdio.h>
-#include <signal.h>
-
+#include <string.h>
+#include <fcntl.h>
#include "defs.h"
-#include "initialize.h"
#include "param.h"
#include "frame.h"
#include "inferior.h"
-
+#include "target.h"
#include "wait.h"
-#include <sys/ioctl.h>
-#include <a.out.h>
-#include <sys/file.h>
+#include "terminal.h"
-#ifdef HAVE_TERMIO
-#include <termio.h>
-#undef TIOCGETP
-#define TIOCGETP TCGETA
-#undef TIOCSETN
-#define TIOCSETN TCSETA
-#undef TIOCSETP
-#define TIOCSETP TCSETAF
-#define TERMINAL struct termio
-#else
-#include <sgtty.h>
-#define TERMINAL struct sgttyb
+#ifdef USG
+#include <sys/types.h>
#endif
-int kiodebug;
+#include <signal.h>
+
+extern void add_syms_addr_command ();
+extern struct value *call_function_by_hand();
+extern void start_remote ();
+
+extern struct target_ops remote_ops; /* Forward decl */
+static int kiodebug;
+static int timeout = 5;
+
+#if 0
int icache;
+#endif
-/* Descriptor for I/O to remote machine. */
-int remote_desc;
+/* Descriptor for I/O to remote machine. Initialize it to -1 so that
+ remote_open knows that we don't have a file open when the program
+ starts. */
+int remote_desc = -1;
-#define PBUFSIZ 300
+#define PBUFSIZ 400
+
+/* Maximum number of bytes to read/write at once. The value here
+ is chosen to fill up a packet (the headers account for the 32). */
+#define MAXBUFBYTES ((PBUFSIZ-32)/2)
static void remote_send ();
static void putpkt ();
static void getpkt ();
+#if 0
static void dcache_flush ();
+#endif
-START_FILE
\f
+/* Called when SIGALRM signal sent due to alarm() timeout. */
+#ifndef HAVE_TERMIO
+void
+remote_timer ()
+{
+ if (kiodebug)
+ printf ("remote_timer called\n");
+
+ alarm (timeout);
+}
+#endif
+
+/* Initialize remote connection */
+
+void
+remote_start()
+{
+}
+
+/* Clean up connection to a remote debugger. */
+
+/* ARGSUSED */
+void
+remote_close (quitting)
+ int quitting;
+{
+ if (remote_desc >= 0)
+ close (remote_desc);
+ remote_desc = -1;
+}
+
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
{
TERMINAL sg;
- remote_debugging = 0;
+ if (name == 0)
+ error (
+"To open a remote debug connection, you need to specify what serial\n\
+device is attached to the remote system (e.g. /dev/ttya).");
+
+ target_preopen (from_tty);
+
+ remote_close (0);
+
+#if 0
dcache_init ();
+#endif
remote_desc = open (name, O_RDWR);
if (remote_desc < 0)
ioctl (remote_desc, TIOCGETP, &sg);
#ifdef HAVE_TERMIO
- sg.c_lflag &= ~ICANON;
+ sg.c_cc[VMIN] = 0; /* read with timeout. */
+ sg.c_cc[VTIME] = timeout * 10;
+ sg.c_lflag &= ~(ICANON | ECHO);
#else
sg.sg_flags = RAW;
#endif
if (from_tty)
printf ("Remote debugging using %s\n", name);
- remote_debugging = 1;
+ 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, "+", 1);
+ putpkt ("?"); /* initiate a query from remote machine */
+
+ start_remote (); /* Initialize gdb process mechanisms */
+}
+
+/* remote_detach()
+ takes a program previously attached to and detaches it.
+ We better not have left any breakpoints
+ in the program or it'll die when it hits one.
+ Close the open connection to the remote debugger.
+ Use this when you want to detach and do something else
+ with your gdb. */
+
+static void
+remote_detach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ if (args)
+ error ("Argument given to \"detach\" when remotely debugging.");
+
+ pop_target ();
+ if (from_tty)
+ printf ("Ending remote debugging.\n");
}
/* Convert hex digit A to a number. */
return a - 'a' + 10;
else
error ("Reply contains invalid hex digit");
+ return -1;
}
/* Convert number NIB to a hex digit. */
\f
/* Tell the remote machine to resume. */
-int
-remote_resume (step, signal)
- int step, signal;
+void
+remote_resume (step, siggnal)
+ int step, siggnal;
{
char buf[PBUFSIZ];
+ if (siggnal)
+ error ("Can't send signals to a remote system.");
+
+#if 0
dcache_flush ();
+#endif
strcpy (buf, step ? "s": "c");
}
/* Wait until the remote machine stops, then return,
- storing status in STATUS just as `wait' would. */
+ storing status in STATUS just as `wait' would.
+ Returns "pid" (though it's not clear what, if anything, that
+ means in the case of this target). */
int
remote_wait (status)
WAITTYPE *status;
{
- char buf[PBUFSIZ];
+ unsigned char buf[PBUFSIZ];
WSETEXIT ((*status), 0);
getpkt (buf);
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 */
void
-remote_fetch_registers (regs)
- char *regs;
+remote_fetch_registers (regno)
+ int regno;
{
char buf[PBUFSIZ];
int i;
char *p;
+ char regs[REGISTER_BYTES];
sprintf (buf, "g");
remote_send (buf);
- /* Reply describes registers byte by byte,
- each byte encoded as two hex characters. */
+ /* Reply describes registers byte by byte, each byte encoded as two
+ hex characters. Suck them all up, then supply them to the
+ register cacheing/storage mechanism. */
p = buf;
for (i = 0; i < REGISTER_BYTES; i++)
regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
p += 2;
}
+ for (i = 0; i < NUM_REGS; i++)
+ supply_register (i, ®s[REGISTER_BYTE(i)]);
}
-/* Store the remote registers from the contents of the block REGS. */
+/* Prepare to store registers. Since we send them all, we have to
+ read out the ones we don't want to change first. */
-void
-remote_store_registers (regs)
- char *regs;
+void
+remote_prepare_to_store ()
+{
+ remote_fetch_registers (-1);
+}
+
+/* Store the remote registers from the contents of the block REGISTERS.
+ FIXME, eventually just store one register if that's all that is needed. */
+
+/* ARGSUSED */
+int
+remote_store_registers (regno)
+ int regno;
{
char buf[PBUFSIZ];
int i;
p = buf + 1;
for (i = 0; i < REGISTER_BYTES; i++)
{
- *p++ = (regs[i] > 4) & 0xf;
- *p++ = regs[i] & 0xf;
+ *p++ = tohex ((registers[i] >> 4) & 0xf);
+ *p++ = tohex (registers[i] & 0xf);
}
+ *p = '\0';
remote_send (buf);
+ return 0;
}
+#if 0
/* Read a word from remote address ADDR and return it.
This goes through the data cache. */
{
dcache_poke (addr, word);
}
+#endif /* 0 */
\f
/* Write memory data directly to the remote machine.
This does not inform the data cache; the data cache uses this.
p = buf + strlen (buf);
for (i = 0; i < len; i++)
{
- *p++ = (myaddr[i] > 4) & 0xf;
- *p++ = myaddr[i] & 0xf;
+ *p++ = tohex ((myaddr[i] >> 4) & 0xf);
+ *p++ = tohex (myaddr[i] & 0xf);
}
+ *p = '\0';
remote_send (buf);
}
each byte encoded as two hex characters. */
p = buf;
- for (i = 0; i < REGISTER_BYTES; i++)
+ for (i = 0; i < len; i++)
{
if (p[0] == 0 || p[1] == 0)
error ("Remote reply is too short: %s", buf);
}
}
\f
+/* Read or write LEN bytes from inferior memory at MEMADDR, transferring
+ to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is
+ nonzero. Returns length of data written or read; 0 for error. */
+
+int
+remote_xfer_inferior_memory(memaddr, myaddr, len, should_write)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+ int should_write;
+{
+ int origlen = len;
+ int xfersize;
+ while (len > 0)
+ {
+ if (len > MAXBUFBYTES)
+ xfersize = MAXBUFBYTES;
+ else
+ xfersize = len;
+
+ if (should_write)
+ remote_write_bytes(memaddr, myaddr, xfersize);
+ else
+ remote_read_bytes (memaddr, myaddr, xfersize);
+ memaddr += xfersize;
+ myaddr += xfersize;
+ len -= xfersize;
+ }
+ return origlen; /* no error possible */
+}
+
+void
+remote_files_info ()
+{
+ printf ("remote files info missing here. FIXME.\n");
+}
+\f
/*
A debug packet whose contents are <data>
*/
+static int
+readchar ()
+{
+ char buf;
+
+ buf = '\0';
+#ifdef HAVE_TERMIO
+ /* termio does the timeout for us. */
+ read (remote_desc, &buf, 1);
+#else
+ alarm (timeout);
+ read (remote_desc, &buf, 1);
+ alarm (0);
+#endif
+
+ return buf & 0x7f;
+}
+
/* Send the command in BUF to the remote machine,
and read the reply into BUF.
Report an error if we get an error reply. */
remote_send (buf)
char *buf;
{
- int i;
+
putpkt (buf);
getpkt (buf);
char *buf;
{
int i;
- char csum = 0;
+ unsigned char csum = 0;
char buf2[500];
- char buf3[1];
int cnt = strlen (buf);
+ char ch;
char *p;
- if (kiodebug)
- fprintf (stderr, "Sending packet: %s\n", buf);
-
/* Copy the packet into buffer BUF2, encapsulating it
and giving it a checksum. */
/* Send it over and over until we get a positive ack. */
do {
+ if (kiodebug)
+ {
+ *p = '\0';
+ printf ("Sending packet: %s (%s)\n", buf2, buf);
+ }
write (remote_desc, buf2, p - buf2);
- read (remote_desc, buf3, 1);
- } while (buf3[0] != '+');
-}
-static int
-readchar ()
-{
- char buf[1];
- while (read (remote_desc, buf, 1) != 1) ;
- return buf[0] & 0x7f;
+ /* read until either a timeout occurs (\0) or '+' is read */
+ do {
+ ch = readchar ();
+ } while ((ch != '+') && (ch != '\0'));
+ } while (ch != '+');
}
/* Read a packet from the remote machine, with error checking,
char *buf;
{
char *bp;
- char csum = 0;
- int c, c1, c2;
- extern kiodebug;
+ unsigned char csum;
+ int c;
+ 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 */
while (1)
{
+ /* Force csum to be zero here because of possible error retry. */
+ csum = 0;
+
while ((c = readchar()) != '$');
bp = buf;
c1 = fromhex (readchar ());
c2 = fromhex (readchar ());
- if (csum == (c1 << 4) + c2)
+ if ((csum & 0xff) == (c1 << 4) + c2)
break;
printf ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
- (c1 << 4) + c2, csum, buf);
+ (c1 << 4) + c2, csum & 0xff, buf);
write (remote_desc, "-", 1);
}
+#if 0
+ immediate_quit--;
+#endif
+
write (remote_desc, "+", 1);
if (kiodebug)
fprintf (stderr,"Packet received :%s\n", buf);
}
\f
+/* The data cache leads to incorrect results because it doesn't know about
+ volatile variables, thus making it impossible to debug functions which
+ use hardware registers. Therefore it is #if 0'd out. Effect on
+ performance is some, for backtraces of functions with a few
+ arguments each. For functions with many arguments, the stack
+ frames don't fit in the cache blocks, which makes the cache less
+ helpful. Disabling the cache is a big performance win for fetching
+ large structures, because the cache code fetched data in 16-byte
+ chunks. */
+#if 0
/* The data cache records all the data read from the remote machine
since the last time it stopped.
for (i=0;i<DCACHE_SIZE;i++,db++)
insque (db, &dcache_free);
}
+#endif /* 0 */
+
+/* Define the target subroutine names */
+
+struct target_ops remote_ops = {
+ "remote", "Remote serial target in gdb-specific protocol",
+ "Use a remote computer via a serial line, using a gdb-specific protocol.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya).",
+ remote_open, remote_close,
+ 0, remote_detach, remote_resume, remote_wait, /* attach */
+ remote_fetch_registers, remote_store_registers,
+ remote_prepare_to_store, 0, 0, /* conv_from, conv_to */
+ remote_xfer_inferior_memory, remote_files_info,
+ 0, 0, /* insert_breakpoint, remove_breakpoint, */
+ 0, 0, 0, 0, 0, /* Terminal crud */
+ 0, /* kill */
+ 0, add_syms_addr_command, /* load */
+ call_function_by_hand,
+ 0, /* lookup_symbol */
+ 0, 0, /* create_inferior FIXME, mourn_inferior FIXME */
+ process_stratum, 0, /* next */
+ 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
+ OPS_MAGIC, /* Always the last thing */
+};
-static initialize ()
+void
+_initialize_remote ()
{
+ add_target (&remote_ops);
}
-
-END_FILE
projects / deliverable / binutils-gdb.git / blobdiff