-/* Memory-access and commands for inferior process, for GDB.
- Copyright (C) 1988-1991 Free Software Foundation, Inc.
+/* Remote target communications for serial-line targets in custom GDB protocol
+ Copyright 1988, 1991, 1992 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+This program 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.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+This program 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. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Remote communication protocol.
All values are encoded in ascii hex digits.
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 "param.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
#include <signal.h>
-extern int memory_insert_breakpoint ();
-extern int memory_remove_breakpoint ();
-extern void add_syms_addr_command ();
-extern struct value *call_function_by_hand();
-extern void start_remote ();
+/* Prototypes for local functions */
+
+static void
+remote_write_bytes PARAMS ((CORE_ADDR, char *, int));
+
+static void
+remote_read_bytes PARAMS ((CORE_ADDR, char *, int));
+
+static void
+remote_files_info PARAMS ((struct target_ops *));
+
+static int
+remote_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
+
+static void
+remote_prepare_to_store PARAMS ((void));
+
+static void
+remote_fetch_registers PARAMS ((int));
+
+static void
+remote_resume PARAMS ((int, int));
+
+static void
+remote_open PARAMS ((char *, int));
+
+static void
+remote_close PARAMS ((int));
+
+static void
+remote_store_registers PARAMS ((int));
+
+static void
+getpkt PARAMS ((char *));
+
+static void
+putpkt PARAMS ((char *));
+
+static void
+remote_send PARAMS ((char *));
+
+static int
+readchar PARAMS ((void));
+
+static int
+remote_wait PARAMS ((WAITTYPE *));
+
+static int
+tohex PARAMS ((int));
+
+static int
+fromhex PARAMS ((int));
+
+static void
+remote_detach PARAMS ((char *, int));
+
extern struct target_ops remote_ops; /* Forward decl */
-static int kiodebug;
+static int kiodebug = 0;
static int timeout = 5;
#if 0
starts. */
int remote_desc = -1;
-#define PBUFSIZ 400
+#define PBUFSIZ 1024
/* 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 ();
+/* Round up PBUFSIZ to hold all the registers, at least. */
+#if REGISTER_BYTES > MAXBUFBYTES
+#undef PBUFSIZ
+#define PBUFSIZ (REGISTER_BYTES * 2 + 32)
#endif
-
\f
/* 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");
}
#endif
-/* Initialize remote connection */
-
-void
-remote_start()
-{
-}
-
/* Clean up connection to a remote debugger. */
-void
+/* ARGSUSED */
+static void
remote_close (quitting)
int quitting;
{
remote_desc = -1;
}
+/* 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},
+};
+
+static int
+damn_b (rate)
+ int rate;
+{
+ int i;
+
+ for (i = 0; baudtab[i].rate != -1; i++)
+ if (rate == baudtab[i].rate) return baudtab[i].damn_b;
+ return B38400; /* Random */
+}
+
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
-void
+static void
remote_open (name, from_tty)
char *name;
int from_tty;
{
TERMINAL sg;
+ int a_rate, b_rate = 0;
+ int baudrate_set = 0;
if (name == 0)
error (
if (remote_desc < 0)
perror_with_name (name);
+ if (baud_rate)
+ {
+ if (sscanf (baud_rate, "%d", &a_rate) == 1)
+ {
+ b_rate = damn_b (a_rate);
+ baudrate_set = 1;
+ }
+ }
+
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;
+ sg.sg_flags |= RAW | ANYP;
+ sg.sg_flags &= ~ECHO;
+ if (baudrate_set)
+ {
+ sg.sg_ispeed = b_rate;
+ sg.sg_ospeed = b_rate;
+ }
#endif
ioctl (remote_desc, TIOCSETP, &sg);
#endif
/* Set up read timeout timer. */
- if ((void (*)) signal (SIGALRM, remote_timer) == (void (*)) -1)
+ 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);
+ write (remote_desc, "+\r", 2);
putpkt ("?"); /* initiate a query from remote machine */
start_remote (); /* Initialize gdb process mechanisms */
\f
/* Tell the remote machine to resume. */
-void
+static void
remote_resume (step, siggnal)
int step, siggnal;
{
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 ();
putpkt (buf);
}
+/* Send ^C to target to halt it. Target will respond, and send us a
+ packet. */
+
+void remote_interrupt(signo)
+ int signo;
+{
+
+ if (kiodebug)
+ printf ("remote_interrupt called\n");
+
+ write (remote_desc, "\003", 1); /* Send a ^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
+static int
remote_wait (status)
WAITTYPE *status;
{
unsigned char buf[PBUFSIZ];
+ void (*ofunc)();
+ unsigned char *p;
+ int i;
+ long regno;
+ char regs[MAX_REGISTER_RAW_SIZE];
WSETEXIT ((*status), 0);
- getpkt (buf);
+
+ ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
+ getpkt ((char *) buf);
+ 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. */
-
-int
+/* Currently we just read all the registers, so we don't use regno. */
+/* ARGSUSED */
+static void
remote_fetch_registers (regno)
int regno;
{
}
for (i = 0; i < NUM_REGS; i++)
supply_register (i, ®s[REGISTER_BYTE(i)]);
- return 0;
}
/* Prepare to store registers. Since we send them all, we have to
read out the ones we don't want to change first. */
-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.
FIXME, eventually just store one register if that's all that is needed. */
-int
+/* ARGSUSED */
+static void
remote_store_registers (regno)
int regno;
{
*p = '\0';
remote_send (buf);
- return 0;
}
#if 0
MYADDR is the address of the buffer in our space.
LEN is the number of bytes. */
-void
+static void
remote_write_bytes (memaddr, myaddr, len)
CORE_ADDR memaddr;
char *myaddr;
sprintf (buf, "M%x,%x:", memaddr, len);
- /* Command describes registers byte by byte,
+ /* We send target system values byte by byte, in increasing byte addresses,
each byte encoded as two hex characters. */
p = buf + strlen (buf);
MYADDR is the address of the buffer in our space.
LEN is the number of bytes. */
-void
+static void
remote_read_bytes (memaddr, myaddr, len)
CORE_ADDR memaddr;
char *myaddr;
sprintf (buf, "m%x,%x", memaddr, len);
remote_send (buf);
- /* Reply describes registers byte by byte,
+ /* Reply describes memory byte by byte,
each byte encoded as two hex characters. */
p = buf;
}
\f
/* Read or write LEN bytes from inferior memory at MEMADDR, transferring
- to or from debugger address MYADDR. Write to inferior if WRITE is
+ 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, write)
+/* ARGSUSED */
+static int
+remote_xfer_memory(memaddr, myaddr, len, should_write, target)
CORE_ADDR memaddr;
char *myaddr;
int len;
- int write;
+ int should_write;
+ struct target_ops *target; /* ignored */
{
int origlen = len;
int xfersize;
else
xfersize = len;
- if (write)
+ if (should_write)
remote_write_bytes(memaddr, myaddr, xfersize);
else
remote_read_bytes (memaddr, myaddr, xfersize);
return origlen; /* no error possible */
}
-void
-remote_files_info ()
+static void
+remote_files_info (ignore)
+struct target_ops *ignore;
{
- printf ("remote files info missing here. FIXME.\n");
+ printf ("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.) */
+
static int
readchar ()
{
- char buf;
+ static int inbuf_index, inbuf_count;
+#define INBUFSIZE PBUFSIZ
+ static char inbuf[INBUFSIZE];
- buf = '\0';
+ 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. */
- read (remote_desc, &buf, 1);
+ /* termio does the timeout for us. */
+ inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
#else
- alarm (timeout);
- read (remote_desc, &buf, 1);
- alarm (0);
+ alarm (timeout);
+ inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
+ alarm (0);
#endif
+ }
- return buf & 0x7f;
+ /* Just return the next character from the buffer. */
+ return inbuf[inbuf_index++] & 0x7f;
}
/* Send the command in BUF to the remote machine,
{
int i;
unsigned char csum = 0;
- char buf2[500];
+ char buf2[PBUFSIZ];
int cnt = strlen (buf);
char ch;
char *p;
/* Copy the packet into buffer BUF2, encapsulating it
and giving it a checksum. */
+ if (cnt > sizeof(buf2) - 5) /* Prosanity check */
+ abort();
+
p = buf2;
*p++ = '$';
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. */
static void
getpkt (buf)
unsigned char csum;
int c;
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
c = readchar ();
if (c == '#')
break;
+ if (bp >= buf+PBUFSIZ-1)
+ {
+ *bp = '\0';
+ printf_filtered ("Remote packet too long: %s\n", buf);
+ 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",
+ printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
(c1 << 4) + c2, csum & 0xff, buf);
- write (remote_desc, "-", 1);
+
+ /* Try the whole thing again. */
+whole:
+ if (++retries < MAX_RETRIES)
+ {
+ write (remote_desc, "-", 1);
+ }
+ else
+ {
+ printf ("Ignoring packet error, continuing...\n");
+ break;
+ }
}
#if 0
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
/* 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 */
+ "remote", /* to_shortname */
+ "Remote serial target in gdb-specific protocol", /* to_longname */
+ "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).", /* to_doc */
+ remote_open, /* to_open */
+ remote_close, /* to_close */
+ NULL, /* to_attach */
+ remote_detach, /* to_detach */
+ remote_resume, /* to_resume */
+ remote_wait, /* to_wait */
+ remote_fetch_registers, /* to_fetch_registers */
+ remote_store_registers, /* to_store_registers */
+ remote_prepare_to_store, /* to_prepare_to_store */
+ remote_xfer_memory, /* to_xfer_memory */
+ remote_files_info, /* to_files_info */
+ NULL, /* to_insert_breakpoint */
+ NULL, /* to_remove_breakpoint */
+ NULL, /* to_terminal_init */
+ NULL, /* to_terminal_inferior */
+ NULL, /* to_terminal_ours_for_output */
+ NULL, /* to_terminal_ours */
+ NULL, /* to_terminal_info */
+ NULL, /* to_kill */
+ NULL, /* to_load */
+ NULL, /* to_lookup_symbol */
+ NULL, /* to_create_inferior */
+ NULL, /* to_mourn_inferior */
+ 0, /* to_can_run */
+ process_stratum, /* to_stratum */
+ NULL, /* to_next */
+ 1, /* to_has_all_memory */
+ 1, /* to_has_memory */
+ 1, /* to_has_stack */
+ 1, /* to_has_registers */
+ 1, /* to_has_execution */
+ NULL, /* sections */
+ NULL, /* sections_end */
+ OPS_MAGIC /* to_magic */
};
void
_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