3d7cd51746
(tob64): Return the result length. (sds_interrupt): Send a stop message. (sds_wait): Add debug output for signal interpretation, flag that signal was due to a trap. (sds_fetch_registers): Fill the registers array correctly for PowerPC. (sds_store_registers): Get the right values from registers array. (putmessage): Tweak length handling so checksum comes out right. (sds_insert_breakpoint, sds_remove_breakpoint): Do correctly.
1247 lines
28 KiB
C
1247 lines
28 KiB
C
/* Remote target communications for serial-line targets using SDS' protocol.
|
||
Copyright 1997 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
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 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
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 this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
||
/* This interface was written by studying the behavior of the SDS
|
||
monitor on an ADS 821/860 board, and by consulting the
|
||
documentation of the monitor that is available on Motorola's web
|
||
site. -sts 8/13/97 */
|
||
|
||
#include "defs.h"
|
||
#include "gdb_string.h"
|
||
#include <fcntl.h>
|
||
#include "frame.h"
|
||
#include "inferior.h"
|
||
#include "bfd.h"
|
||
#include "symfile.h"
|
||
#include "target.h"
|
||
#include "wait.h"
|
||
#include "gdbcmd.h"
|
||
#include "objfiles.h"
|
||
#include "gdb-stabs.h"
|
||
#include "gdbthread.h"
|
||
|
||
#include "dcache.h"
|
||
|
||
#ifdef USG
|
||
#include <sys/types.h>
|
||
#endif
|
||
|
||
#include <signal.h>
|
||
#include "serial.h"
|
||
|
||
/* Declarations of local functions. */
|
||
|
||
static int sds_write_bytes PARAMS ((CORE_ADDR, char *, int));
|
||
|
||
static int sds_read_bytes PARAMS ((CORE_ADDR, char *, int));
|
||
|
||
static void sds_files_info PARAMS ((struct target_ops *ignore));
|
||
|
||
static int sds_xfer_memory PARAMS ((CORE_ADDR, char *,
|
||
int, int, struct target_ops *));
|
||
|
||
static void sds_prepare_to_store PARAMS ((void));
|
||
|
||
static void sds_fetch_registers PARAMS ((int));
|
||
|
||
static void sds_resume PARAMS ((int, int, enum target_signal));
|
||
|
||
static int sds_start_remote PARAMS ((char *));
|
||
|
||
static void sds_open PARAMS ((char *, int));
|
||
|
||
static void sds_close PARAMS ((int));
|
||
|
||
static void sds_store_registers PARAMS ((int));
|
||
|
||
static void sds_mourn PARAMS ((void));
|
||
|
||
static void sds_restart PARAMS ((void));
|
||
|
||
static void sds_create_inferior PARAMS ((char *, char *, char **));
|
||
|
||
static int getmessage PARAMS ((unsigned char *, int));
|
||
|
||
static int putmessage PARAMS ((unsigned char *, int));
|
||
|
||
static int sds_send PARAMS ((unsigned char *, int));
|
||
|
||
static int readchar PARAMS ((int));
|
||
|
||
static int sds_wait PARAMS ((int, struct target_waitstatus *));
|
||
|
||
static void sds_kill PARAMS ((void));
|
||
|
||
static int tohex PARAMS ((int));
|
||
|
||
static int fromhex PARAMS ((int));
|
||
|
||
static void sds_detach PARAMS ((char *, int));
|
||
|
||
static void sds_interrupt PARAMS ((int));
|
||
|
||
static void sds_interrupt_twice PARAMS ((int));
|
||
|
||
static void interrupt_query PARAMS ((void));
|
||
|
||
static int read_frame PARAMS ((char *));
|
||
|
||
static int sds_insert_breakpoint PARAMS ((CORE_ADDR, char *));
|
||
|
||
static int sds_remove_breakpoint PARAMS ((CORE_ADDR, char *));
|
||
|
||
|
||
static struct target_ops sds_ops; /* Forward decl */
|
||
|
||
/* 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. */
|
||
|
||
/* Changed to allow option to set timeout value.
|
||
was static int sds_timeout = 2; */
|
||
static int sds_timeout = 2;
|
||
|
||
/* Descriptor for I/O to remote machine. Initialize it to NULL so
|
||
that sds_open knows that we don't have a file open when the program
|
||
starts. */
|
||
|
||
static serial_t sds_desc = NULL;
|
||
|
||
/* This limit comes from the monitor. */
|
||
|
||
#define PBUFSIZ 250
|
||
|
||
/* 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 int next_msg_id;
|
||
|
||
static int just_started;
|
||
|
||
static int message_pending;
|
||
|
||
|
||
/* Restart the remote side; this is an extended protocol operation. */
|
||
|
||
static void
|
||
sds_restart ()
|
||
{
|
||
}
|
||
|
||
/* Clean up connection to a remote debugger. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
sds_close (quitting)
|
||
int quitting;
|
||
{
|
||
if (sds_desc)
|
||
SERIAL_CLOSE (sds_desc);
|
||
sds_desc = NULL;
|
||
}
|
||
|
||
/* Stub for catch_errors. */
|
||
|
||
static int
|
||
sds_start_remote (dummy)
|
||
char *dummy;
|
||
{
|
||
char c;
|
||
unsigned char buf[200];
|
||
|
||
immediate_quit = 1; /* Allow user to interrupt it */
|
||
|
||
/* Ack any packet which the remote side has already sent. */
|
||
SERIAL_WRITE (sds_desc, "{#*\r\n", 5);
|
||
SERIAL_WRITE (sds_desc, "{#}\r\n", 5);
|
||
|
||
while ((c = readchar (1)) >= 0)
|
||
printf_unfiltered ("%c");
|
||
printf_unfiltered ("\n");
|
||
|
||
next_msg_id = 251;
|
||
|
||
buf[0] = 26;
|
||
sds_send (buf, 1);
|
||
|
||
buf[0] = 0;
|
||
sds_send (buf, 1);
|
||
|
||
immediate_quit = 0;
|
||
|
||
start_remote (); /* Initialize gdb process mechanisms */
|
||
return 1;
|
||
}
|
||
|
||
/* Open a connection to a remote debugger.
|
||
NAME is the filename used for communication. */
|
||
|
||
static DCACHE *sds_dcache;
|
||
|
||
static void
|
||
sds_open (name, from_tty)
|
||
char *name;
|
||
int from_tty;
|
||
{
|
||
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);
|
||
|
||
unpush_target (&sds_ops);
|
||
|
||
sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes);
|
||
|
||
sds_desc = SERIAL_OPEN (name);
|
||
if (!sds_desc)
|
||
perror_with_name (name);
|
||
|
||
if (baud_rate != -1)
|
||
{
|
||
if (SERIAL_SETBAUDRATE (sds_desc, baud_rate))
|
||
{
|
||
SERIAL_CLOSE (sds_desc);
|
||
perror_with_name (name);
|
||
}
|
||
}
|
||
|
||
|
||
SERIAL_RAW (sds_desc);
|
||
|
||
/* If there is something sitting in the buffer we might take it as a
|
||
response to a command, which would be bad. */
|
||
SERIAL_FLUSH_INPUT (sds_desc);
|
||
|
||
if (from_tty)
|
||
{
|
||
puts_filtered ("Remote debugging using ");
|
||
puts_filtered (name);
|
||
puts_filtered ("\n");
|
||
}
|
||
push_target (&sds_ops); /* Switch to using remote target now */
|
||
|
||
/* Without this, some commands which require an active target (such
|
||
as kill) won't work. This variable serves (at least) double duty
|
||
as both the pid of the target process (if it has such), and as a
|
||
flag indicating that a target is active. These functions should
|
||
be split out into seperate variables, especially since GDB will
|
||
someday have a notion of debugging several processes. */
|
||
|
||
inferior_pid = 42000;
|
||
|
||
just_started = 1;
|
||
|
||
/* Start the remote connection; if error (0), discard this target.
|
||
In particular, if the user quits, be sure to discard it (we'd be
|
||
in an inconsistent state otherwise). */
|
||
if (!catch_errors (sds_start_remote, (char *)0,
|
||
"Couldn't establish connection to remote target\n",
|
||
RETURN_MASK_ALL))
|
||
pop_target ();
|
||
}
|
||
|
||
/* This takes a program previously attached to and detaches it. After
|
||
this is done, GDB can be used to debug some other program. We
|
||
better not have left any breakpoints in the target program or it'll
|
||
die when it hits one. */
|
||
|
||
static void
|
||
sds_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
|
||
if (args)
|
||
error ("Argument given to \"detach\" when remotely debugging.");
|
||
|
||
#if 0
|
||
/* Tell the remote target to detach. */
|
||
strcpy (buf, "D");
|
||
sds_send (buf, 1);
|
||
#endif
|
||
|
||
pop_target ();
|
||
if (from_tty)
|
||
puts_filtered ("Ending remote debugging.\n");
|
||
}
|
||
|
||
/* Convert hex digit A to a number. */
|
||
|
||
static int
|
||
fromhex (a)
|
||
int a;
|
||
{
|
||
if (a >= '0' && a <= '9')
|
||
return a - '0';
|
||
else if (a >= 'a' && a <= 'f')
|
||
return a - 'a' + 10;
|
||
else
|
||
error ("Reply contains invalid hex digit %d", a);
|
||
}
|
||
|
||
/* Convert number NIB to a hex digit. */
|
||
|
||
static int
|
||
tohex (nib)
|
||
int nib;
|
||
{
|
||
if (nib < 10)
|
||
return '0'+nib;
|
||
else
|
||
return 'a'+nib-10;
|
||
}
|
||
|
||
static int
|
||
tob64 (inbuf, outbuf, len)
|
||
unsigned char *inbuf;
|
||
char *outbuf;
|
||
int len;
|
||
{
|
||
int i, sum;
|
||
char *p;
|
||
|
||
if (len % 3 != 0)
|
||
error ("bad length");
|
||
|
||
p = outbuf;
|
||
for (i = 0; i < len; i += 3)
|
||
{
|
||
/* Collect the next three bytes into a number. */
|
||
sum = ((long) *inbuf++) << 16;
|
||
sum |= ((long) *inbuf++) << 8;
|
||
sum |= ((long) *inbuf++);
|
||
|
||
/* Spit out 4 6-bit encodings. */
|
||
*p++ = ((sum >> 18) & 0x3f) + '0';
|
||
*p++ = ((sum >> 12) & 0x3f) + '0';
|
||
*p++ = ((sum >> 6) & 0x3f) + '0';
|
||
*p++ = (sum & 0x3f) + '0';
|
||
}
|
||
return (p - outbuf);
|
||
}
|
||
|
||
static int
|
||
fromb64 (inbuf, outbuf, len)
|
||
char *inbuf, *outbuf;
|
||
int len;
|
||
{
|
||
int i, sum;
|
||
|
||
if (len % 4 != 0)
|
||
error ("bad length");
|
||
|
||
for (i = 0; i < len; i += 4)
|
||
{
|
||
/* Collect 4 6-bit digits. */
|
||
sum = (*inbuf++ - '0') << 18;
|
||
sum |= (*inbuf++ - '0') << 12;
|
||
sum |= (*inbuf++ - '0') << 6;
|
||
sum |= (*inbuf++ - '0');
|
||
|
||
/* Now take the resulting 24-bit number and get three bytes out
|
||
of it. */
|
||
*outbuf++ = (sum >> 16) & 0xff;
|
||
*outbuf++ = (sum >> 8) & 0xff;
|
||
*outbuf++ = sum & 0xff;
|
||
}
|
||
|
||
return (len / 4) * 3;
|
||
}
|
||
|
||
|
||
/* Tell the remote machine to resume. */
|
||
|
||
static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
|
||
int last_sent_step;
|
||
|
||
static void
|
||
sds_resume (pid, step, siggnal)
|
||
int pid, step;
|
||
enum target_signal siggnal;
|
||
{
|
||
unsigned char buf[PBUFSIZ];
|
||
|
||
dcache_flush (sds_dcache);
|
||
|
||
last_sent_signal = siggnal;
|
||
last_sent_step = step;
|
||
|
||
buf[0] = (step ? 21 : 20);
|
||
buf[1] = 0; /* (should be signal?) */
|
||
|
||
sds_send (buf, 2);
|
||
}
|
||
|
||
/* Send a message to target to halt it. Target will respond, and send
|
||
us a message pending notice. */
|
||
|
||
static void
|
||
sds_interrupt (signo)
|
||
int signo;
|
||
{
|
||
unsigned char buf[PBUFSIZ];
|
||
|
||
/* If this doesn't work, try more severe steps. */
|
||
signal (signo, sds_interrupt_twice);
|
||
|
||
if (remote_debug)
|
||
printf_unfiltered ("sds_interrupt called\n");
|
||
|
||
buf[0] = 25;
|
||
sds_send (buf, 1);
|
||
}
|
||
|
||
static void (*ofunc)();
|
||
|
||
/* The user typed ^C twice. */
|
||
|
||
static void
|
||
sds_interrupt_twice (signo)
|
||
int signo;
|
||
{
|
||
signal (signo, ofunc);
|
||
|
||
interrupt_query ();
|
||
|
||
signal (signo, sds_interrupt);
|
||
}
|
||
|
||
/* Ask the user what to do when an interrupt is received. */
|
||
|
||
static void
|
||
interrupt_query ()
|
||
{
|
||
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);
|
||
}
|
||
|
||
target_terminal_inferior ();
|
||
}
|
||
|
||
/* If nonzero, ignore the next kill. */
|
||
int kill_kludge;
|
||
|
||
/* Wait until the remote machine stops, then return, 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). */
|
||
|
||
static int
|
||
sds_wait (pid, status)
|
||
int pid;
|
||
struct target_waitstatus *status;
|
||
{
|
||
unsigned char buf[PBUFSIZ];
|
||
int retlen;
|
||
|
||
status->kind = TARGET_WAITKIND_EXITED;
|
||
status->value.integer = 0;
|
||
|
||
ofunc = (void (*)()) signal (SIGINT, sds_interrupt);
|
||
|
||
signal (SIGINT, ofunc);
|
||
|
||
if (just_started)
|
||
{
|
||
just_started = 0;
|
||
status->kind = TARGET_WAITKIND_STOPPED;
|
||
return inferior_pid;
|
||
}
|
||
|
||
while (1)
|
||
{
|
||
getmessage (buf, 1);
|
||
|
||
if (message_pending)
|
||
{
|
||
buf[0] = 26;
|
||
retlen = sds_send (buf, 1);
|
||
if (remote_debug)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr, "Signals: %04x %02x %02x\n",
|
||
((int) buf[0]) << 8 + buf[1],
|
||
buf[2], buf[3]);
|
||
}
|
||
message_pending = 0;
|
||
status->kind = TARGET_WAITKIND_STOPPED;
|
||
status->value.sig = TARGET_SIGNAL_TRAP;
|
||
goto got_status;
|
||
}
|
||
}
|
||
got_status:
|
||
return inferior_pid;
|
||
}
|
||
|
||
static unsigned char sprs[16];
|
||
|
||
/* Read the remote registers into the block REGS. */
|
||
/* Currently we just read all the registers, so we don't use regno. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
sds_fetch_registers (regno)
|
||
int regno;
|
||
{
|
||
unsigned char buf[PBUFSIZ];
|
||
int i, retlen;
|
||
char *p;
|
||
char regs[REGISTER_BYTES];
|
||
|
||
/* Unimplemented registers read as all bits zero. */
|
||
memset (regs, 0, REGISTER_BYTES);
|
||
|
||
buf[0] = 18;
|
||
buf[1] = 1;
|
||
buf[2] = 0;
|
||
retlen = sds_send (buf, 3);
|
||
|
||
for (i = 0; i < 4 * 6; ++i)
|
||
regs[i + 4 * 32 + 8 * 32] = buf[i];
|
||
for (i = 0; i < 4 * 4; ++i)
|
||
sprs[i] = buf[i + 4 * 7];
|
||
|
||
buf[0] = 18;
|
||
buf[1] = 2;
|
||
buf[2] = 0;
|
||
retlen = sds_send (buf, 3);
|
||
|
||
for (i = 0; i < retlen; i++)
|
||
regs[i] = buf[i];
|
||
|
||
/* (should warn about reply too short) */
|
||
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
supply_register (i, ®s[REGISTER_BYTE(i)]);
|
||
}
|
||
|
||
/* Prepare to store registers. Since we may send them all, we have to
|
||
read out the ones we don't want to change first. */
|
||
|
||
static void
|
||
sds_prepare_to_store ()
|
||
{
|
||
/* Make sure the entire registers array is valid. */
|
||
read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
|
||
}
|
||
|
||
/* Store register REGNO, or all registers if REGNO == -1, from the contents
|
||
of REGISTERS. FIXME: ignores errors. */
|
||
|
||
static void
|
||
sds_store_registers (regno)
|
||
int regno;
|
||
{
|
||
unsigned char *p, buf[PBUFSIZ];
|
||
int i;
|
||
|
||
/* Store all the special-purpose registers. */
|
||
p = buf;
|
||
*p++ = 19;
|
||
*p++ = 1;
|
||
*p++ = 0;
|
||
*p++ = 0;
|
||
for (i = 0; i < 4 * 6; i++)
|
||
*p++ = registers[i + 4 * 32 + 8 * 32];
|
||
for (i = 0; i < 4 * 1; i++)
|
||
*p++ = 0;
|
||
for (i = 0; i < 4 * 4; i++)
|
||
*p++ = sprs[i];
|
||
|
||
sds_send (buf, p - buf);
|
||
|
||
/* Store all the general-purpose registers. */
|
||
p = buf;
|
||
*p++ = 19;
|
||
*p++ = 2;
|
||
*p++ = 0;
|
||
*p++ = 0;
|
||
for (i = 0; i < 4 * 32; i++)
|
||
*p++ = registers[i];
|
||
|
||
sds_send (buf, p - buf);
|
||
|
||
}
|
||
|
||
/* Write memory data directly to the remote machine. This does not
|
||
inform the data cache; the data cache uses this. MEMADDR is the
|
||
address in the remote memory space. MYADDR is the address of the
|
||
buffer in our space. LEN is the number of bytes.
|
||
|
||
Returns number of bytes transferred, or 0 for error. */
|
||
|
||
static int
|
||
sds_write_bytes (memaddr, myaddr, len)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
int max_buf_size; /* Max size of packet output buffer */
|
||
int origlen;
|
||
unsigned char buf[PBUFSIZ];
|
||
int todo;
|
||
int i;
|
||
|
||
/* Chop the transfer down if necessary */
|
||
|
||
max_buf_size = 150;
|
||
|
||
origlen = len;
|
||
while (len > 0)
|
||
{
|
||
todo = min (len, max_buf_size);
|
||
|
||
buf[0] = 13;
|
||
buf[1] = 0;
|
||
buf[2] = (int) (memaddr >> 24) & 0xff;
|
||
buf[3] = (int) (memaddr >> 16) & 0xff;
|
||
buf[4] = (int) (memaddr >> 8) & 0xff;
|
||
buf[5] = (int) (memaddr ) & 0xff;
|
||
buf[6] = 1;
|
||
buf[7] = 0;
|
||
|
||
for (i = 0; i < todo; i++)
|
||
buf[i + 8] = myaddr[i];
|
||
|
||
sds_send (buf, 8 + todo);
|
||
|
||
/* (should look at result) */
|
||
|
||
myaddr += todo;
|
||
memaddr += todo;
|
||
len -= todo;
|
||
}
|
||
return origlen;
|
||
}
|
||
|
||
/* Read memory data directly from the remote machine. This does not
|
||
use the data cache; the data cache uses this. MEMADDR is the
|
||
address in the remote memory space. MYADDR is the address of the
|
||
buffer in our space. LEN is the number of bytes.
|
||
|
||
Returns number of bytes transferred, or 0 for error. */
|
||
|
||
static int
|
||
sds_read_bytes (memaddr, myaddr, len)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
int max_buf_size; /* Max size of packet output buffer */
|
||
int origlen, retlen;
|
||
unsigned char buf[PBUFSIZ];
|
||
int todo;
|
||
int i;
|
||
|
||
/* Chop the transfer down if necessary */
|
||
|
||
max_buf_size = 150;
|
||
|
||
origlen = len;
|
||
while (len > 0)
|
||
{
|
||
todo = min (len, max_buf_size);
|
||
|
||
buf[0] = 12;
|
||
buf[1] = 0;
|
||
buf[2] = (int) (memaddr >> 24) & 0xff;
|
||
buf[3] = (int) (memaddr >> 16) & 0xff;
|
||
buf[4] = (int) (memaddr >> 8) & 0xff;
|
||
buf[5] = (int) (memaddr ) & 0xff;
|
||
buf[6] = (int) (todo >> 8) & 0xff;
|
||
buf[7] = (int) (todo ) & 0xff;
|
||
buf[8] = 1;
|
||
|
||
retlen = sds_send (buf, 9);
|
||
|
||
if (retlen - 2 != todo)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Reply describes memory byte by byte. */
|
||
|
||
for (i = 0; i < todo; i++)
|
||
myaddr[i] = buf[i + 2];
|
||
|
||
myaddr += todo;
|
||
memaddr += todo;
|
||
len -= todo;
|
||
}
|
||
|
||
return origlen;
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
sds_xfer_memory(memaddr, myaddr, len, should_write, target)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int should_write;
|
||
struct target_ops *target; /* ignored */
|
||
{
|
||
return dcache_xfer_memory (sds_dcache, memaddr, myaddr, len, should_write);
|
||
}
|
||
|
||
|
||
static void
|
||
sds_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
puts_filtered ("Debugging over a serial connection, using SDS protocol.\n");
|
||
}
|
||
|
||
/* Stuff for dealing with the packets which are part of this protocol.
|
||
See comment at top of file for details. */
|
||
|
||
/* Read a single character from the remote end, masking it down to 7 bits. */
|
||
|
||
static int
|
||
readchar (timeout)
|
||
int timeout;
|
||
{
|
||
int ch;
|
||
|
||
ch = SERIAL_READCHAR (sds_desc, timeout);
|
||
|
||
if (remote_debug > 1 && ch >= 0)
|
||
printf_unfiltered("%c(%x)", ch, ch);
|
||
|
||
switch (ch)
|
||
{
|
||
case SERIAL_EOF:
|
||
error ("Remote connection closed");
|
||
case SERIAL_ERROR:
|
||
perror_with_name ("Remote communication error");
|
||
case SERIAL_TIMEOUT:
|
||
return ch;
|
||
default:
|
||
return ch & 0x7f;
|
||
}
|
||
}
|
||
|
||
/* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably
|
||
because 253, 254, and 255 are special flags in the protocol.) */
|
||
|
||
static int
|
||
compute_checksum (csum, buf, len)
|
||
int csum, len;
|
||
char *buf;
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < len; ++i)
|
||
csum += (unsigned char) buf[i];
|
||
|
||
csum %= 253;
|
||
return csum;
|
||
}
|
||
|
||
/* Send the command in BUF to the remote machine, and read the reply
|
||
into BUF also. */
|
||
|
||
static int
|
||
sds_send (buf, len)
|
||
unsigned char *buf;
|
||
int len;
|
||
{
|
||
putmessage (buf, len);
|
||
|
||
return getmessage (buf, 0);
|
||
}
|
||
|
||
/* Send a message to the remote machine. */
|
||
|
||
static int
|
||
putmessage (buf, len)
|
||
unsigned char *buf;
|
||
int len;
|
||
{
|
||
int i, enclen;
|
||
unsigned char csum = 0;
|
||
char buf2[PBUFSIZ], buf3[PBUFSIZ];
|
||
unsigned char header[3];
|
||
int ch;
|
||
int tcount = 0;
|
||
char *p;
|
||
|
||
/* Copy the packet into buffer BUF2, encapsulating it
|
||
and giving it a checksum. */
|
||
|
||
if (len > 170) /* Prosanity check */
|
||
abort();
|
||
|
||
if (remote_debug)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr, "Message to send: \"");
|
||
for (i = 0; i < len; ++i)
|
||
fprintf_unfiltered (gdb_stderr, "%02x", buf[i]);
|
||
fprintf_unfiltered (gdb_stderr, "\"\n");
|
||
}
|
||
|
||
p = buf2;
|
||
*p++ = '$';
|
||
|
||
if (len % 3 != 0)
|
||
{
|
||
buf[len] = '\0';
|
||
buf[len+1] = '\0';
|
||
}
|
||
|
||
header[1] = next_msg_id;
|
||
|
||
header[2] = len;
|
||
|
||
csum = compute_checksum (csum, buf, len);
|
||
csum = compute_checksum (csum, header + 1, 2);
|
||
|
||
header[0] = csum;
|
||
|
||
tob64 (header, p, 3);
|
||
p += 4;
|
||
enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3);
|
||
|
||
for (i = 0; i < enclen; ++i)
|
||
*p++ = buf3[i];
|
||
*p++ = '\r';
|
||
*p++ = '\n';
|
||
|
||
next_msg_id = (next_msg_id + 3) % 245;
|
||
|
||
/* Send it over and over until we get a positive ack. */
|
||
|
||
while (1)
|
||
{
|
||
int started_error_output = 0;
|
||
|
||
if (remote_debug)
|
||
{
|
||
*p = '\0';
|
||
printf_unfiltered ("Sending encoded: \"%s\"", buf2);
|
||
printf_unfiltered (" (Checksum %d, id %d, length %d)\n",
|
||
header[0], header[1], header[2]);
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
if (SERIAL_WRITE (sds_desc, buf2, p - buf2))
|
||
perror_with_name ("putmessage: write failed");
|
||
|
||
return 1;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/* Come here after finding the start of the frame. Collect the rest
|
||
into BUF. Returns 0 on any error, 1 on success. */
|
||
|
||
static int
|
||
read_frame (buf)
|
||
char *buf;
|
||
{
|
||
char *bp;
|
||
int c;
|
||
|
||
bp = buf;
|
||
|
||
while (1)
|
||
{
|
||
c = readchar (sds_timeout);
|
||
|
||
switch (c)
|
||
{
|
||
case SERIAL_TIMEOUT:
|
||
if (remote_debug)
|
||
puts_filtered ("Timeout in mid-message, retrying\n");
|
||
return 0;
|
||
case '$':
|
||
if (remote_debug)
|
||
puts_filtered ("Saw new packet start in middle of old one\n");
|
||
return 0; /* Start a new packet, count retries */
|
||
case '\r':
|
||
break;
|
||
|
||
case '\n':
|
||
{
|
||
*bp = '\000';
|
||
if (remote_debug)
|
||
fprintf_unfiltered (gdb_stderr, "Received encoded: \"%s\"\n",
|
||
buf);
|
||
return 1;
|
||
}
|
||
|
||
default:
|
||
if (bp < buf + PBUFSIZ - 1)
|
||
{
|
||
*bp++ = c;
|
||
continue;
|
||
}
|
||
|
||
*bp = '\0';
|
||
puts_filtered ("Message too long: ");
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Read a packet from the remote machine, with error checking,
|
||
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 int
|
||
getmessage (buf, forever)
|
||
unsigned char *buf;
|
||
int forever;
|
||
{
|
||
int c, c2, c3;
|
||
int tries;
|
||
int timeout;
|
||
int val, i, len, csum;
|
||
unsigned char header[3];
|
||
unsigned char inbuf[500];
|
||
|
||
strcpy (buf, "timeout");
|
||
|
||
if (forever)
|
||
{
|
||
#ifdef MAINTENANCE_CMDS
|
||
timeout = watchdog > 0 ? watchdog : -1;
|
||
#else
|
||
timeout = -1;
|
||
#endif
|
||
}
|
||
|
||
else
|
||
timeout = sds_timeout;
|
||
|
||
#define MAX_TRIES 3
|
||
|
||
for (tries = 1; tries <= MAX_TRIES; tries++)
|
||
{
|
||
/* 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. */
|
||
|
||
/* Note that we will only wait forever prior to the start of a packet.
|
||
After that, we expect characters to arrive at a brisk pace. They
|
||
should show up within sds_timeout intervals. */
|
||
|
||
do
|
||
{
|
||
c = readchar (timeout);
|
||
|
||
if (c == SERIAL_TIMEOUT)
|
||
{
|
||
#ifdef MAINTENANCE_CMDS
|
||
if (forever) /* Watchdog went off. Kill the target. */
|
||
{
|
||
target_mourn_inferior ();
|
||
error ("Watchdog has expired. Target detached.\n");
|
||
}
|
||
#endif
|
||
if (remote_debug)
|
||
puts_filtered ("Timed out.\n");
|
||
goto retry;
|
||
}
|
||
}
|
||
while (c != '$' && c != '{');
|
||
|
||
/* We might have seen a "trigraph", a sequence of three characters
|
||
that indicate various sorts of communication state. */
|
||
|
||
if (c == '{')
|
||
{
|
||
/* Read the other two chars of the trigraph. */
|
||
c2 = readchar (timeout);
|
||
c3 = readchar (timeout);
|
||
if (remote_debug)
|
||
fprintf_unfiltered (gdb_stderr, "Trigraph %c%c%c received\n",
|
||
c, c2, c3);
|
||
if (c3 == '+')
|
||
{
|
||
message_pending = 1;
|
||
return;
|
||
}
|
||
continue;
|
||
}
|
||
|
||
val = read_frame (inbuf);
|
||
|
||
if (val == 1)
|
||
{
|
||
fromb64 (inbuf, header, 4);
|
||
/* (should check out other bits) */
|
||
fromb64 (inbuf + 4, buf, strlen (inbuf) - 4);
|
||
|
||
len = header[2];
|
||
|
||
csum = 0;
|
||
csum = compute_checksum (csum, buf, len);
|
||
csum = compute_checksum (csum, header + 1, 2);
|
||
|
||
if (csum != header[0])
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"Checksum mismatch: computed %d, received %d\n",
|
||
csum, header[0]);
|
||
|
||
if (header[2] == 0xff)
|
||
fprintf_unfiltered (gdb_stderr, "Requesting resend...\n");
|
||
|
||
if (remote_debug)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"... (Got checksum %d, id %d, length %d)\n",
|
||
header[0], header[1], header[2]);
|
||
fprintf_unfiltered (gdb_stderr, "Message received: \"");
|
||
for (i = 0; i < len; ++i)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr, "%02x", (unsigned char) buf[i]);
|
||
}
|
||
fprintf_unfiltered (gdb_stderr, "\"\n");
|
||
}
|
||
|
||
/* no ack required? */
|
||
return len;
|
||
}
|
||
|
||
/* Try the whole thing again. */
|
||
retry:
|
||
/* need to do something here */
|
||
}
|
||
|
||
/* We have tried hard enough, and just can't receive the packet. Give up. */
|
||
|
||
printf_unfiltered ("Ignoring packet error, continuing...\n");
|
||
}
|
||
|
||
static void
|
||
sds_kill ()
|
||
{
|
||
/* For some mysterious reason, wait_for_inferior calls kill instead of
|
||
mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */
|
||
if (kill_kludge)
|
||
{
|
||
kill_kludge = 0;
|
||
target_mourn_inferior ();
|
||
return;
|
||
}
|
||
|
||
#if 0 /* fix to use 1-arg fn */
|
||
/* Use catch_errors so the user can quit from gdb even when we aren't on
|
||
speaking terms with the remote system. */
|
||
catch_errors (putmessage, "k", "", RETURN_MASK_ERROR);
|
||
#endif
|
||
|
||
/* 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
|
||
sds_mourn ()
|
||
{
|
||
unpush_target (&sds_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
static void
|
||
sds_create_inferior (exec_file, args, env)
|
||
char *exec_file;
|
||
char *args;
|
||
char **env;
|
||
{
|
||
/* Rip out the breakpoints; we'll reinsert them after restarting
|
||
the remote server. */
|
||
remove_breakpoints ();
|
||
|
||
/* Now restart the remote server. */
|
||
sds_restart ();
|
||
|
||
/* Now put the breakpoints back in. This way we're safe if the
|
||
restart function works via a unix fork on the remote side. */
|
||
insert_breakpoints ();
|
||
|
||
/* Clean up from the last time we were running. */
|
||
clear_proceed_status ();
|
||
|
||
/* Let the remote process run. */
|
||
proceed (-1, TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
|
||
/* The SDS monitor has commands for breakpoint insertion, although it
|
||
it doesn't actually manage the breakpoints, it just returns the
|
||
replaced instruction back to the debugger. */
|
||
|
||
static int
|
||
sds_insert_breakpoint (addr, contents_cache)
|
||
CORE_ADDR addr;
|
||
char *contents_cache;
|
||
{
|
||
int i, retlen;
|
||
unsigned char *p, buf[PBUFSIZ];
|
||
|
||
p = buf;
|
||
*p++ = 16;
|
||
*p++ = 0;
|
||
*p++ = (int) (addr >> 24) & 0xff;
|
||
*p++ = (int) (addr >> 16) & 0xff;
|
||
*p++ = (int) (addr >> 8) & 0xff;
|
||
*p++ = (int) (addr ) & 0xff;
|
||
|
||
retlen = sds_send (buf, p - buf);
|
||
|
||
for (i = 0; i < 4; ++i)
|
||
contents_cache[i] = buf[i + 2];
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
sds_remove_breakpoint (addr, contents_cache)
|
||
CORE_ADDR addr;
|
||
char *contents_cache;
|
||
{
|
||
int i, retlen;
|
||
unsigned char *p, buf[PBUFSIZ];
|
||
|
||
p = buf;
|
||
*p++ = 17;
|
||
*p++ = 0;
|
||
*p++ = (int) (addr >> 24) & 0xff;
|
||
*p++ = (int) (addr >> 16) & 0xff;
|
||
*p++ = (int) (addr >> 8) & 0xff;
|
||
*p++ = (int) (addr ) & 0xff;
|
||
for (i = 0; i < 4; ++i)
|
||
*p++ = contents_cache[i];
|
||
|
||
retlen = sds_send (buf, p - buf);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Define the target operations vector. */
|
||
|
||
static struct target_ops sds_ops =
|
||
{
|
||
"sds", /* to_shortname */
|
||
"Remote serial target with SDS protocol", /* to_longname */
|
||
"Use a remote computer via a serial line, using the SDS protocol.\n\
|
||
Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */
|
||
sds_open, /* to_open */
|
||
sds_close, /* to_close */
|
||
NULL, /* to_attach */
|
||
sds_detach, /* to_detach */
|
||
sds_resume, /* to_resume */
|
||
sds_wait, /* to_wait */
|
||
sds_fetch_registers, /* to_fetch_registers */
|
||
sds_store_registers, /* to_store_registers */
|
||
sds_prepare_to_store, /* to_prepare_to_store */
|
||
sds_xfer_memory, /* to_xfer_memory */
|
||
sds_files_info, /* to_files_info */
|
||
sds_insert_breakpoint, /* to_insert_breakpoint */
|
||
sds_remove_breakpoint, /* 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 */
|
||
sds_kill, /* to_kill */
|
||
generic_load, /* to_load */
|
||
NULL, /* to_lookup_symbol */
|
||
sds_create_inferior, /* to_create_inferior */
|
||
sds_mourn, /* to_mourn_inferior */
|
||
0, /* to_can_run */
|
||
0, /* to_notice_signals */
|
||
0, /* to_thread_alive */
|
||
0, /* to_stop */
|
||
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 */
|
||
};
|
||
|
||
/* Put a command string, in args, out to the monitor and display the
|
||
reply message. */
|
||
|
||
static void
|
||
sds_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char *p;
|
||
int i, len, retlen;
|
||
unsigned char buf[1000];
|
||
|
||
/* Convert hexadecimal chars into a byte buffer. */
|
||
p = args;
|
||
len = 0;
|
||
while (*p != '\0')
|
||
{
|
||
buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
if (p[1] == '\0')
|
||
break;
|
||
p += 2;
|
||
}
|
||
|
||
retlen = sds_send (buf, len);
|
||
|
||
printf_filtered ("Reply is ");
|
||
for (i = 0; i < retlen; ++i)
|
||
{
|
||
printf_filtered ("%02x", buf[i]);
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
|
||
void
|
||
_initialize_remote_sds ()
|
||
{
|
||
add_target (&sds_ops);
|
||
|
||
add_show_from_set (add_set_cmd ("sdstimeout", no_class,
|
||
var_integer, (char *)&sds_timeout,
|
||
"Set timeout value for sds read.\n", &setlist),
|
||
&showlist);
|
||
|
||
add_com ("sds", class_obscure, sds_command,
|
||
"Send a command to the SDS monitor.");
|
||
}
|