/* Remote debugging interface for MIPS remote debugging protocol.
- Copyright 1993, 1994 Free Software Foundation, Inc.
+ Copyright 1993, 1994, 1995 Free Software Foundation, Inc.
Contributed by Cygnus Support. Written by Ian Lance Taylor
<ian@cygnus.com>.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "inferior.h"
static void mips_send_packet PARAMS ((const char *s, int get_ack));
+static void mips_send_command PARAMS ((const char *cmd, int prompt));
+
static int mips_receive_packet PARAMS ((char *buff, int throw_error,
int timeout));
-static int mips_request PARAMS ((char cmd, unsigned int addr,
- unsigned int data, int *perr, int timeout));
+static int mips_request PARAMS ((int cmd, unsigned int addr,
+ unsigned int data, int *perr, int timeout,
+ char *buff));
static void mips_initialize PARAMS ((void));
static void mips_open PARAMS ((char *name, int from_tty));
+static void pmon_open PARAMS ((char *name, int from_tty));
+
static void mips_close PARAMS ((int quitting));
static void mips_detach PARAMS ((char *args, int from_tty));
static int mips_wait PARAMS ((int pid, struct target_waitstatus *status));
+static int pmon_wait PARAMS ((int pid, struct target_waitstatus *status));
+
static int mips_map_regno PARAMS ((int regno));
static void mips_fetch_registers PARAMS ((int regno));
static void mips_mourn_inferior PARAMS ((void));
-/* A forward declaration. */
+static int pmon_makeb64 PARAMS ((unsigned long v, char *p, int n, int *chksum));
+
+static int pmon_zeroset PARAMS ((int recsize, char **buff, int *amount,
+ unsigned int *chksum));
+
+static int pmon_checkset PARAMS ((int recsize, char **buff, int *value));
+
+static void pmon_make_fastrec PARAMS ((char **outbuf, unsigned char *inbuf,
+ int *inptr, int inamount, int *recsize,
+ unsigned int *csum, unsigned int *zerofill));
+
+static int pmon_check_ack PARAMS ((void));
+
+static void pmon_load_fast PARAMS ((char *file));
+
+static void mips_load PARAMS ((char *file, int from_tty));
+
+static int mips_make_srec PARAMS ((char *buffer, int type, CORE_ADDR memaddr,
+ unsigned char *myaddr, int len));
+
+static int common_breakpoint PARAMS ((int cmd, CORE_ADDR addr, CORE_ADDR mask,
+ char *flags));
+
+static void common_open PARAMS ((struct target_ops *ops, char *name,
+ int from_tty));
+/* Forward declarations. */
extern struct target_ops mips_ops;
+extern struct target_ops pmon_ops;
\f
/* The MIPS remote debugging interface is built on top of a simple
packet protocol. Each packet is organized as follows:
The value is
0x40 + seq
An acknowlegment packet contains the sequence number of the
- packet being acknowledged plus 1 module 64. Data packets are
+ packet being acknowledged plus 1 modulo 64. Data packets are
transmitted in sequence. There may only be one outstanding
unacknowledged data packet at a time. The sequence numbers
are independent in each direction. If an acknowledgement for
/* The sequence number modulos. */
#define SEQ_MODULOS (64)
+enum mips_monitor_type {
+ /* IDT/SIM monitor being used: */
+ MON_IDT,
+ /* PMON monitor being used: */
+ MON_PMON,
+ /* Last and unused value, for sizing vectors, etc. */
+ MON_LAST
+};
+static enum mips_monitor_type mips_monitor = MON_LAST;
+
+/* The default monitor prompt text: */
+static char *mips_monitor_prompt = TARGET_MONITOR_PROMPT;
+/* For the Cogent PMON world this is still not ideal. The default
+ prompt is "PMON> ", unfortunately the user can change the prompt
+ and the new prompt will survive over a power-cycle (EEPROM). This
+ means that the code should really force the monitor prompt to a
+ known value as the very first action, and that the
+ "mips_monitor_prompt" support is not needed... since the prompt
+ could be explicitly set to TARGET_MONITOR_PROMPT (even though it
+ may be the prompt for a different monitor). However, this will
+ require changing the mips_initialize reset sequence. (TODO) */
+
/* Set to 1 if the target is open. */
static int mips_is_open;
+/* Currently active target description (if mips_is_open == 1) */
+static struct target_ops *current_ops;
+
/* Set to 1 while the connection is being initialized. */
static int mips_initializing;
/* The next sequence number to send. */
-static int mips_send_seq;
+static unsigned int mips_send_seq;
/* The next sequence number we expect to receive. */
-static int mips_receive_seq;
+static unsigned int mips_receive_seq;
/* The time to wait before retransmitting a packet, in seconds. */
static int mips_retransmit_wait = 3;
/* Handle used to access serial I/O stream. */
static serial_t mips_desc;
+/* Counts the number of times the user tried to interrupt the target (usually
+ via ^C. */
+static int interrupt_count;
+
+/* If non-zero, means that the target is running. */
+static int mips_wait_flag = 0;
+
+/* If non-zero, monitor supports breakpoint commands. */
+static monitor_supports_breakpoints = 0;
+
+/* Data cache header. */
+
+static DCACHE *mips_dcache;
+
+/* Non-zero means that we've just hit a read or write watchpoint */
+static int hit_watchpoint;
+
/* Handle low-level error that we can't recover from. Note that just
error()ing out from target_wait or some such low-level place will cause
all hell to break loose--the rest of GDB will tend to get left in an
vfprintf_filtered (gdb_stderr, string, args);
fprintf_filtered (gdb_stderr, "\n");
va_end (args);
+ gdb_flush (gdb_stderr);
/* Clean up in such a way that mips_close won't try to talk to the
board (it almost surely won't work since we weren't able to talk to
return_to_top_level (RETURN_ERROR);
}
+/* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
+ timed out. */
+
+int
+mips_expect (string)
+ char *string;
+{
+ char *p = string;
+
+ immediate_quit = 1;
+ while (1)
+ {
+ int c;
+
+/* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we
+ were waiting for the mips_monitor_prompt... */
+
+ c = SERIAL_READCHAR (mips_desc, 2);
+
+ if (c == SERIAL_TIMEOUT)
+ return 0;
+
+ if (c == *p++)
+ {
+ if (*p == '\0')
+ {
+ immediate_quit = 0;
+ return 1;
+ }
+ }
+ else
+ {
+ p = string;
+ if (c == *p)
+ p++;
+ }
+ }
+}
+
+/* Read the required number of characters into the given buffer (which
+ is assumed to be large enough). The only failure is a timeout. */
+int
+mips_getstring (string, n)
+ char *string;
+ int n;
+{
+ char *p = string;
+ int c;
+
+ immediate_quit = 1;
+ while (n > 0)
+ {
+ c = SERIAL_READCHAR (mips_desc, 2);
+
+ if (c == SERIAL_TIMEOUT) {
+ fprintf_unfiltered (stderr, "Failed to read %d characters from target (TIMEOUT)\n", n);
+ return 0;
+ }
+
+ *p++ = c;
+ n--;
+ }
+
+ return 1;
+}
+
/* Read a character from the remote, aborting on error. Returns
SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR
- returns). FIXME: If we see the string "<IDT>" from the board, then
- we are debugging on the main console port, and we have somehow
- dropped out of remote debugging mode. In this case, we
- automatically go back in to remote debugging mode. This is a hack,
- put in because I can't find any way for a program running on the
- remote board to terminate without also ending remote debugging
+ returns). FIXME: If we see the string mips_monitor_prompt from
+ the board, then we are debugging on the main console port, and we
+ have somehow dropped out of remote debugging mode. In this case,
+ we automatically go back in to remote debugging mode. This is a
+ hack, put in because I can't find any way for a program running on
+ the remote board to terminate without also ending remote debugging
mode. I assume users won't have any trouble with this; for one
thing, the IDT documentation generally assumes that the remote
debugging port is not the console port. This is, however, very
{
int ch;
static int state = 0;
- static char nextstate[5] = { '<', 'I', 'D', 'T', '>' };
+ static int mips_monitor_prompt_len = -1;
+
+ /* NASTY, since we assume that the prompt does not change after the
+ first mips_readchar call: */
+ if (mips_monitor_prompt_len = -1)
+ mips_monitor_prompt_len = strlen(mips_monitor_prompt);
+
+#ifdef MAINTENANCE_CMDS
+ {
+ int i;
+
+ i = timeout;
+ if (i == -1 && watchdog > 0)
+ i = watchdog;
+ }
+#endif
- if (state == 5)
+ if (state == mips_monitor_prompt_len)
timeout = 1;
ch = SERIAL_READCHAR (mips_desc, timeout);
+#ifdef MAINTENANCE_CMDS
+ if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */
+ {
+ target_mourn_inferior ();
+ error ("Watchdog has expired. Target detached.\n");
+ }
+#endif
if (ch == SERIAL_EOF)
mips_error ("End of file from remote");
if (ch == SERIAL_ERROR)
mips_error ("Error reading from remote: %s", safe_strerror (errno));
- if (sr_get_debug () > 1)
+ if (remote_debug > 1)
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
printf_unfiltered ("Timed out in read\n");
}
- /* If we have seen <IDT> and we either time out, or we see a @
- (which was echoed from a packet we sent), reset the board as
- described above. The first character in a packet after the SYN
- (which is not echoed) is always an @ unless the packet is more
- than 64 characters long, which ours never are. */
+ /* If we have seen mips_monitor_prompt and we either time out, or
+ we see a @ (which was echoed from a packet we sent), reset the
+ board as described above. The first character in a packet after
+ the SYN (which is not echoed) is always an @ unless the packet is
+ more than 64 characters long, which ours never are. */
if ((ch == SERIAL_TIMEOUT || ch == '@')
- && state == 5
+ && state == mips_monitor_prompt_len
&& ! mips_initializing)
{
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
printf_unfiltered ("Reinitializing MIPS debugging mode\n");
- SERIAL_WRITE (mips_desc, "\015db tty0\015", sizeof "\015db tty0\015" - 1);
- sleep (1);
mips_need_reply = 0;
mips_initialize ();
state = 0;
- mips_error ("Remote board reset");
+ /* At this point, about the only thing we can do is abort the command
+ in progress and get back to command level as quickly as possible. */
+
+ error ("Remote board reset, debug protocol re-initialized.");
}
- if (ch == nextstate[state])
+ if (ch == mips_monitor_prompt[state])
++state;
else
state = 0;
{
ch = mips_readchar (timeout);
if (ch == SERIAL_TIMEOUT)
- return -1;
+ return -1;
if (ch != SYN)
{
/* Printing the character here lets the user of gdb see
what the program is outputting, if the debugging is
being done on the console port. Don't use _filtered;
we can't deal with a QUIT out of target_wait. */
- if (! mips_initializing || sr_get_debug () > 0)
+ if (! mips_initializing || remote_debug > 0)
{
- if (ch < 0x20 && ch != '\n')
+ /* Note that the host's idea of newline may not
+ correspond to the target's idea, so recognize
+ newline by its actual ASCII code, but write it
+ out using the \n notation. */
+ if (ch < 0x20 && ch != '\012')
{
putchar_unfiltered ('^');
putchar_unfiltered (ch + 0x40);
}
+ else if (ch == '\012')
+ putchar_unfiltered ('\n');
else
putchar_unfiltered (ch);
gdb_flush (gdb_stdout);
}
++*pgarbage;
- if (*pgarbage > mips_syn_garbage)
- mips_error ("Remote debugging protocol failure");
+ if (mips_syn_garbage > 0
+ && *pgarbage > mips_syn_garbage)
+ mips_error ("Debug protocol failure: more than %d characters before a sync.",
+ mips_syn_garbage);
}
}
{
ch = mips_readchar (timeout);
if (ch == SERIAL_TIMEOUT)
- return -1;
-
+ return -1;
/* Make sure this is a header byte. */
if (ch == SYN || ! HDR_CHECK (ch))
break;
/* If we got the complete header, we can return. Otherwise we
loop around and keep looking for SYN. */
if (i >= HDR_LENGTH)
- return 0;
+ return 0;
}
}
the sequence number we expect in the acknowledgement. */
mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS;
- if (! get_ack)
- return;
-
/* We can only have one outstanding data packet, so we just wait for
the acknowledgement here. Keep retransmitting the packet until
we get one, or until we've tried too many times. */
int garbage;
int ch;
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
HDR_LENGTH + len + TRLR_LENGTH) != 0)
mips_error ("write to target failed: %s", safe_strerror (errno));
+ if (! get_ack)
+ return;
+
garbage = 0;
ch = 0;
while (1)
ignore it. FIXME: If the acknowledgement is lost, this
data packet may be the packet the remote sends after the
acknowledgement. */
- if (HDR_IS_DATA (hdr))
+ if (HDR_IS_DATA (hdr)) {
+ int i;
+
+ /* Ignore any errors raised whilst attempting to ignore
+ packet. */
+
+ len = HDR_GET_LEN (hdr);
+
+ for (i = 0; i < len; i++)
+ {
+ int rch;
+
+ rch = mips_readchar (2);
+ if (rch == SYN)
+ {
+ ch = SYN;
+ break;
+ }
+ if (rch == SERIAL_TIMEOUT)
+ break;
+ /* ignore the character */
+ }
+
+ if (i == len)
+ (void) mips_receive_trailer (trlr, &garbage, &ch, 2);
+
+ /* We don't bother checking the checksum, or providing an
+ ACK to the packet. */
continue;
+ }
/* If the length is not 0, this is a garbled packet. */
if (HDR_GET_LEN (hdr) != 0)
!= TRLR_GET_CKSUM (trlr))
continue;
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
hdr[HDR_LENGTH] = '\0';
trlr[TRLR_LENGTH] = '\0';
/* An acknowledgement is probably a duplicate; ignore it. */
if (! HDR_IS_DATA (hdr))
{
+ len = HDR_GET_LEN (hdr);
+ /* Check if the length is valid for an ACK, we may aswell
+ try and read the remainder of the packet: */
+ if (len == 0)
+ {
+ /* Ignore the error condition, since we are going to
+ ignore the packet anyway. */
+ (void) mips_receive_trailer (trlr, &garbage, &ch, timeout);
+ }
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
printf_unfiltered ("Ignoring unexpected ACK\n");
continue;
}
- /* If this is the wrong sequence number, ignore it. */
- if (HDR_GET_SEQ (hdr) != mips_receive_seq)
- {
- /* Don't use _filtered; we can't deal with a QUIT out of
- target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
- printf_unfiltered ("Ignoring sequence number %d (want %d)\n",
- HDR_GET_SEQ (hdr), mips_receive_seq);
- continue;
- }
-
len = HDR_GET_LEN (hdr);
-
for (i = 0; i < len; i++)
{
int rch;
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
printf_unfiltered ("Got new SYN after %d chars (wanted %d)\n",
i, len);
continue;
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
printf_unfiltered ("Got SYN when wanted trailer\n");
continue;
}
+ /* If this is the wrong sequence number, ignore it. */
+ if (HDR_GET_SEQ (hdr) != mips_receive_seq)
+ {
+ /* Don't use _filtered; we can't deal with a QUIT out of
+ target_wait, and I think this might be called from there. */
+ if (remote_debug > 0)
+ printf_unfiltered ("Ignoring sequence number %d (want %d)\n",
+ HDR_GET_SEQ (hdr), mips_receive_seq);
+ continue;
+ }
+
if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr))
- break;
+ break;
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
printf_unfiltered ("Bad checksum; data %d, trailer %d\n",
ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
ack[HDR_LENGTH + TRLR_LENGTH] = '\0';
/* Don't use _filtered; we can't deal with a QUIT out of
}
}
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
buff[len] = '\0';
/* Don't use _filtered; we can't deal with a QUIT out of
ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
ack[HDR_LENGTH + TRLR_LENGTH] = '\0';
/* Don't use _filtered; we can't deal with a QUIT out of
target board reports. */
static int
-mips_request (cmd, addr, data, perr, timeout)
- char cmd;
+mips_request (cmd, addr, data, perr, timeout, buff)
+ int cmd;
unsigned int addr;
unsigned int data;
int *perr;
int timeout;
+ char *buff;
{
- char buff[DATA_MAXLEN + 1];
+ char myBuff[DATA_MAXLEN + 1];
int len;
int rpid;
char rcmd;
int rerrflg;
int rresponse;
-
+
+ if (buff == (char *) NULL)
+ buff = myBuff;
+
if (cmd != '\0')
{
if (mips_need_reply)
mips_initializing = 0;
}
+static void
+mips_send_command (cmd, prompt)
+ const char *cmd;
+ int prompt;
+{
+ SERIAL_WRITE (mips_desc, cmd, strlen(cmd));
+ mips_expect (cmd);
+ mips_expect ("\012");
+ if (prompt)
+ mips_expect (mips_monitor_prompt);
+}
+
+/* Enter remote (dbx) debug mode: */
+static void
+mips_enter_debug ()
+{
+ /* Reset the sequence numbers, ready for the new debug sequence: */
+ mips_send_seq = 0;
+ mips_receive_seq = 0;
+
+ if (mips_monitor == MON_PMON)
+ mips_send_command ("debug\015", 0);
+ else /* assume IDT monitor by default */
+ mips_send_command ("db tty0\015", 0);
+
+ SERIAL_WRITE (mips_desc, "\015", sizeof "\015" - 1);
+
+ /* We don't need to absorb any spurious characters here, since the
+ mips_receive_header will eat up a reasonable number of characters
+ whilst looking for the SYN, however this avoids the "garbage"
+ being displayed to the user. */
+ if (mips_monitor == MON_PMON)
+ mips_expect ("\015");
+
+ {
+ char buff[DATA_MAXLEN + 1];
+ if (mips_receive_packet (buff, 1, 3) < 0)
+ mips_error ("Failed to initialize (didn't receive packet).");
+ }
+}
+
+/* Exit remote (dbx) debug mode, returning to the monitor prompt: */
+static int
+mips_exit_debug ()
+{
+ int err;
+
+ mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err,
+ mips_receive_wait, NULL);
+
+ if (mips_monitor == MON_PMON && !mips_expect ("Exiting remote debug mode"))
+ return -1;
+
+ if (!mips_expect ("\015\012"))
+ return -1;
+
+ if (!mips_expect (mips_monitor_prompt))
+ return -1;
+
+ return 0;
+}
+
/* Initialize a new connection to the MIPS board, and make sure we are
really connected. */
static void
mips_initialize ()
{
- char cr;
- char buff[DATA_MAXLEN + 1];
int err;
struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL);
+ int j;
/* What is this code doing here? I don't see any way it can happen, and
it might mean mips_initializing didn't get cleared properly.
So I'll make it a warning. */
+
if (mips_initializing)
{
warning ("internal error: mips_initialize called twice");
return;
}
+ mips_wait_flag = 0;
mips_initializing = 1;
- mips_send_seq = 0;
- mips_receive_seq = 0;
-
- /* The board seems to want to send us a packet. I don't know what
- it means. The packet seems to be triggered by a carriage return
- character, although perhaps any character would do. */
- cr = '\015';
- /* FIXME check the result from this */
- SERIAL_WRITE (mips_desc, &cr, 1);
+ /* At this point, the packit protocol isn't responding. We'll try getting
+ into the monitor, and restarting the protocol. */
- if (mips_receive_packet (buff, 0, 3) < 0)
+ /* Force the system into the monitor. After this we *should* be at
+ the mips_monitor_prompt. */
+ if (mips_monitor == MON_PMON)
+ j = 0; /* start by checking if we are already at the prompt */
+ else
+ j = 1; /* start by sending a break */
+ for (; j <= 4; j++)
{
- char cc;
+ switch (j)
+ {
+ case 0: /* First, try sending a CR */
+ SERIAL_FLUSH_INPUT (mips_desc);
+ SERIAL_WRITE (mips_desc, "\015", 1);
+ break;
+ case 1: /* First, try sending a break */
+ SERIAL_SEND_BREAK (mips_desc);
+ break;
+ case 2: /* Then, try a ^C */
+ SERIAL_WRITE (mips_desc, "\003", 1);
+ break;
+ case 3: /* Then, try escaping from download */
+ {
+ if (mips_monitor == MON_PMON)
+ {
+ char tbuff[7];
+
+ /* We shouldn't need to send multiple termination
+ sequences, since the target performs line (or
+ block) reads, and then processes those
+ packets. In-case we were downloading a large packet
+ we flush the output buffer before inserting a
+ termination sequence. */
+ SERIAL_FLUSH_OUTPUT (mips_desc);
+ sprintf (tbuff, "\015/E/E\015");
+ SERIAL_WRITE (mips_desc, tbuff, 6);
+ }
+ else
+ {
+ char srec[10];
+ int i;
+
+ /* We are possibly in binary download mode, having
+ aborted in the middle of an S-record. ^C won't
+ work because of binary mode. The only reliable way
+ out is to send enough termination packets (8 bytes)
+ to fill up and then overflow the largest size
+ S-record (255 bytes in this case). This amounts to
+ 256/8 + 1 packets.
+ */
+
+ mips_make_srec (srec, '7', 0, NULL, 0);
+
+ for (i = 1; i <= 33; i++)
+ {
+ SERIAL_WRITE (mips_desc, srec, 8);
+
+ if (SERIAL_READCHAR (mips_desc, 0) >= 0)
+ break; /* Break immediatly if we get something from
+ the board. */
+ }
+ }
+ }
+ break;
+ case 4:
+ mips_error ("Failed to initialize.");
+ }
- /* We did not receive the packet we expected; try resetting the
- board and trying again. */
- printf_filtered ("Failed to initialize; trying to reset board\n");
- cc = '\003';
- SERIAL_WRITE (mips_desc, &cc, 1);
- sleep (2);
- SERIAL_WRITE (mips_desc, "\015db tty0\015", sizeof "\015db tty0\015" - 1);
- sleep (1);
- cr = '\015';
- SERIAL_WRITE (mips_desc, &cr, 1);
+ if (mips_expect (mips_monitor_prompt))
+ break;
+ }
+
+ if (mips_monitor == MON_PMON)
+ {
+ /* Ensure the correct target state: */
+ mips_send_command ("set regsize 64\015", -1);
+ mips_send_command ("set hostport tty0\015", -1);
+ mips_send_command ("set brkcmd \"\"\015", -1);
+ /* Delete all the current breakpoints: */
+ mips_send_command ("db *\015", -1);
+ /* NOTE: PMON does not have breakpoint support through the
+ "debug" mode, only at the monitor command-line. */
}
- mips_receive_packet (buff, 1, 3);
+
+ mips_enter_debug ();
+
+ /* Clear all breakpoints: */
+ if (common_breakpoint ('b', -1, 0, NULL))
+ monitor_supports_breakpoints = 0;
+ else
+ monitor_supports_breakpoints = 1;
do_cleanups (old_cleanups);
/* If this doesn't call error, we have connected; we don't care if
the request itself succeeds or fails. */
+
mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err,
- mips_receive_wait);
+ mips_receive_wait, NULL);
+ set_current_frame (create_new_frame (read_fp (), read_pc ()));
+ select_frame (get_current_frame (), 0);
}
/* Open a connection to the remote board. */
-
static void
-mips_open (name, from_tty)
+common_open (ops, name, from_tty)
+ struct target_ops *ops;
char *name;
int from_tty;
{
target_preopen (from_tty);
if (mips_is_open)
- unpush_target (&mips_ops);
+ unpush_target (current_ops);
mips_desc = SERIAL_OPEN (name);
if (mips_desc == (serial_t) NULL)
SERIAL_RAW (mips_desc);
+ current_ops = ops;
mips_is_open = 1;
mips_initialize ();
printf_unfiltered ("Remote MIPS debugging using %s\n", name);
/* Switch to using remote target now. */
- push_target (&mips_ops);
+ push_target (ops);
/* FIXME: Should we call start_remote here? */
ptype = mips_read_processor_type ();
if (ptype)
mips_set_processor_type_command (strsave (ptype), 0);
+
+/* This is really the job of start_remote however, that makes an assumption
+ that the target is about to print out a status message of some sort. That
+ doesn't happen here (in fact, it may not be possible to get the monitor to
+ send the appropriate packet). */
+
+ flush_cached_frames ();
+ registers_changed ();
+ stop_pc = read_pc ();
+ set_current_frame (create_new_frame (read_fp (), stop_pc));
+ select_frame (get_current_frame (), 0);
+ print_stack_frame (selected_frame, -1, 1);
+}
+
+static void
+mips_open (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ mips_monitor = MON_IDT;
+ common_open (&mips_ops, name, from_tty);
+}
+
+static void
+pmon_open (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ /* The PMON monitor has a prompt different from the default
+ "TARGET_MONITOR_PROMPT": */
+ mips_monitor_prompt = "PMON> ";
+ mips_monitor = MON_PMON;
+ common_open (&pmon_ops, name, from_tty);
}
+
/* Close a connection to the remote board. */
static void
mips_is_open = 0;
/* Get the board out of remote debugging mode. */
- mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err,
- mips_receive_wait);
+ (void) mips_exit_debug ();
SERIAL_CLOSE (mips_desc);
}
error ("Argument given to \"detach\" when remotely debugging.");
pop_target ();
+
+ mips_close (1);
+
if (from_tty)
printf_unfiltered ("Ending remote MIPS debugging.\n");
}
int pid, step;
enum target_signal siggnal;
{
+
+/* start-sanitize-gm */
+#ifndef GENERAL_MAGIC
if (siggnal != TARGET_SIGNAL_0)
warning
("Can't send signals to a remote system. Try `handle %s ignore'.",
target_signal_to_name (siggnal));
+#endif /* GENERAL_MAGIC */
+/* end-sanitize-gm */
mips_request (step ? 's' : 'c',
(unsigned int) 1,
- (unsigned int) 0,
+ (unsigned int) siggnal,
(int *) NULL,
- mips_receive_wait);
+ mips_receive_wait, NULL);
}
/* Return the signal corresponding to SIG, where SIG is the number which
{
int rstatus;
int err;
+ char buff[DATA_MAXLEN];
+ int rpc, rfp, rsp;
+ char flags[20];
+ int nfields;
+
+ interrupt_count = 0;
+ hit_watchpoint = 0;
/* If we have not sent a single step or continue command, then the
board is waiting for us to do something. Return a status
}
/* No timeout; we sit here as long as the program continues to execute. */
- rstatus = mips_request ('\0', (unsigned int) 0, (unsigned int) 0, &err, -1);
+ mips_wait_flag = 1;
+ rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1,
+ buff);
+ mips_wait_flag = 0;
+ if (err)
+ mips_error ("Remote failure: %s", safe_strerror (errno));
+
+ nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s",
+ &rpc, &rfp, &rsp, flags);
+
+ /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */
+
+ if (nfields == 7 || nfields == 9)
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+
+ store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rpc);
+ supply_register (PC_REGNUM, buf);
+
+ store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rfp);
+ supply_register (30, buf); /* This register they are avoiding and so it is unnamed */
+
+ store_unsigned_integer (buf, REGISTER_RAW_SIZE (SP_REGNUM), rsp);
+ supply_register (SP_REGNUM, buf);
+
+ store_unsigned_integer (buf, REGISTER_RAW_SIZE (FP_REGNUM), 0);
+ supply_register (FP_REGNUM, buf);
+
+ if (nfields == 9)
+ {
+ int i;
+
+ for (i = 0; i <= 2; i++)
+ if (flags[i] == 'r' || flags[i] == 'w')
+ hit_watchpoint = 1;
+ else if (flags[i] == '\000')
+ break;
+ }
+ }
+
+ /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG
+ and so on, because the constants we want here are determined by the
+ MIPS protocol and have nothing to do with what host we are running on. */
+ if ((rstatus & 0377) == 0)
+ {
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = (((rstatus) >> 8) & 0377);
+ }
+ else if ((rstatus & 0377) == 0177)
+ {
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377);
+ }
+ else
+ {
+ status->kind = TARGET_WAITKIND_SIGNALLED;
+ status->value.sig = mips_signal_from_protocol (rstatus & 0177);
+ }
+
+ return 0;
+}
+
+static int
+pmon_wait (pid, status)
+ int pid;
+ struct target_waitstatus *status;
+{
+ int rstatus;
+ int err;
+ char buff[DATA_MAXLEN];
+
+ interrupt_count = 0;
+ hit_watchpoint = 0;
+
+ /* If we have not sent a single step or continue command, then the
+ board is waiting for us to do something. Return a status
+ indicating that it is stopped. */
+ if (! mips_need_reply)
+ {
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = TARGET_SIGNAL_TRAP;
+ return 0;
+ }
+
+ /* Sit, polling the serial until the target decides to talk to
+ us. NOTE: the timeout value we use is used not just for the
+ first character, but for all the characters. */
+ mips_wait_flag = 1;
+ rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1,
+ buff);
+ mips_wait_flag = 0;
if (err)
mips_error ("Remote failure: %s", safe_strerror (errno));
+ /* NOTE: The following (sig) numbers are defined by PMON:
+ SPP_SIGTRAP 5 breakpoint
+ SPP_SIGINT 2
+ SPP_SIGSEGV 11
+ SPP_SIGBUS 10
+ SPP_SIGILL 4
+ SPP_SIGFPE 8
+ SPP_SIGTERM 15 */
+
+ /* On returning from a continue, the PMON monitor seems to start
+ echoing back the messages we send prior to sending back the
+ ACK. The code can cope with this, but to try and avoid the
+ unnecessary serial traffic, and "spurious" characters displayed
+ to the user, we cheat and reset the debug protocol. The problems
+ seems to be caused by a check on the number of arguments, and the
+ command length, within the monitor causing it to echo the command
+ as a bad packet. */
+ mips_exit_debug ();
+ mips_enter_debug ();
+
/* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG
and so on, because the constants we want here are determined by the
MIPS protocol and have nothing to do with what host we are running on. */
val = 0;
else
{
- val = mips_request ('r', (unsigned int) mips_map_regno (regno),
- (unsigned int) 0, &err, mips_receive_wait);
+#if 0 /* Unfortunately the PMON version in the Vr4300 board has been
+ compiled without the 64bit register access commands. This
+ means we cannot get hold of the full register width. */
+ if (mips_monitor == MON_PMON)
+ val = mips_request ('t', (unsigned int) mips_map_regno (regno),
+ (unsigned int) 0, &err, mips_receive_wait, NULL);
+ else
+#endif
+ val = mips_request ('r', (unsigned int) mips_map_regno (regno),
+ (unsigned int) 0, &err, mips_receive_wait, NULL);
if (err)
mips_error ("Can't read register %d: %s", regno,
safe_strerror (errno));
mips_request ('R', (unsigned int) mips_map_regno (regno),
(unsigned int) read_register (regno),
- &err, mips_receive_wait);
+ &err, mips_receive_wait, NULL);
if (err)
mips_error ("Can't write register %d: %s", regno, safe_strerror (errno));
}
int err;
val = mips_request ('d', (unsigned int) addr, (unsigned int) 0, &err,
- mips_receive_wait);
+ mips_receive_wait, NULL);
if (err)
{
/* Data space failed; try instruction space. */
val = mips_request ('i', (unsigned int) addr, (unsigned int) 0, &err,
- mips_receive_wait);
+ mips_receive_wait, NULL);
if (err)
mips_error ("Can't read address 0x%x: %s", addr, safe_strerror (errno));
}
oldcontents = mips_request ('D', (unsigned int) addr, (unsigned int) val,
&err,
- mips_receive_wait);
+ mips_receive_wait, NULL);
if (err)
{
/* Data space failed; try instruction space. */
oldcontents = mips_request ('I', (unsigned int) addr,
(unsigned int) val, &err,
- mips_receive_wait);
+ mips_receive_wait, NULL);
if (err)
return errno;
}
static void
mips_kill ()
{
+ if (!mips_wait_flag)
+ return;
+
+ interrupt_count++;
+
+ if (interrupt_count >= 2)
+ {
+ interrupt_count = 0;
+
+ target_terminal_ours ();
+
+ if (query ("Interrupted while waiting for the program.\n\
+Give up (and stop debugging it)? "))
+ {
+ /* Clean up in such a way that mips_close won't try to talk to the
+ board (it almost surely won't work since we weren't able to talk to
+ it). */
+ mips_wait_flag = 0;
+ mips_is_open = 0;
+ SERIAL_CLOSE (mips_desc);
+
+ printf_unfiltered ("Ending remote MIPS debugging.\n");
+ target_mourn_inferior ();
+
+ return_to_top_level (RETURN_QUIT);
+ }
+
+ target_terminal_inferior ();
+ }
+
+ if (remote_debug > 0)
+ printf_unfiltered ("Sending break\n");
+
+ SERIAL_SEND_BREAK (mips_desc);
+
#if 0
if (mips_is_open)
{
/* FIXME: Should we set inferior_pid here? */
+/* start-sanitize-gm */
+#ifdef GENERAL_MAGIC
+ magic_create_inferior_hook ();
+ proceed (entry_pt, TARGET_SIGNAL_PWR, 0);
+#else
+/* end-sanitize-gm */
proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0);
+/* start-sanitize-gm */
+#endif /* GENERAL_MAGIC */
+/* end-sanitize-gm */
}
/* Clean up after a process. Actually nothing to do. */
static void
mips_mourn_inferior ()
{
- unpush_target (&mips_ops);
+ if (current_ops != NULL)
+ unpush_target (current_ops);
generic_mourn_inferior ();
}
\f
{
int status;
+ if (monitor_supports_breakpoints)
+ return common_breakpoint ('B', addr, 0x3, "f");
+
return mips_store_word (addr, BREAK_INSN, contents_cache);
}
CORE_ADDR addr;
char *contents_cache;
{
+ if (monitor_supports_breakpoints)
+ return common_breakpoint ('b', addr, 0, NULL);
+
return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE);
}
-\f
-/* The target vector. */
-struct target_ops mips_ops =
+#if 0 /* currently not used */
+/* PMON does not currently provide support for the debug mode 'b'
+ commands to manipulate breakpoints. However, if we wanted to use
+ the monitor breakpoints (rather than the GDB BREAK_INSN version)
+ then this code performs the work needed to leave debug mode,
+ set/clear the breakpoint, and then return to debug mode. */
+
+#define PMON_MAX_BP (33) /* 32 SW, 1 HW */
+static CORE_ADDR mips_pmon_bp_info[PMON_MAX_BP];
+/* NOTE: The code relies on this vector being zero-initialised by the system */
+
+static int
+pmon_insert_breakpoint (addr, contents_cache)
+ CORE_ADDR addr;
+ char *contents_cache;
{
- "mips", /* to_shortname */
- "Remote MIPS debugging over serial line", /* to_longname */
- "\
-Debug a board using the MIPS remote debugging protocol over a serial line.\n\
-The argument is the device it is connected to or, if it contains a colon,\n\
-HOST:PORT to access a board over a network", /* to_doc */
- mips_open, /* to_open */
- mips_close, /* to_close */
- NULL, /* to_attach */
+ int status;
+
+ if (monitor_supports_breakpoints)
+ {
+ char tbuff[12]; /* space for breakpoint command */
+ int bpnum;
+ CORE_ADDR bpaddr;
+
+ /* PMON does not support debug level breakpoint set/remove: */
+ if (mips_exit_debug ())
+ mips_error ("Failed to exit debug mode");
+
+ sprintf (tbuff, "b %08x\015", addr);
+ mips_send_command (tbuff, 0);
+
+ mips_expect ("Bpt ");
+
+ if (!mips_getstring (tbuff, 2))
+ return 1;
+ tbuff[2] = '\0'; /* terminate the string */
+ if (sscanf (tbuff, "%d", &bpnum) != 1)
+ {
+ fprintf_unfiltered (stderr, "Invalid decimal breakpoint number from target: %s\n", tbuff);
+ return 1;
+ }
+
+ mips_expect (" = ");
+
+ /* Lead in the hex number we are expecting: */
+ tbuff[0] = '0';
+ tbuff[1] = 'x';
+
+ if (!mips_getstring (&tbuff[2], 8))
+ return 1;
+ tbuff[10] = '\0'; /* terminate the string */
+
+ if (sscanf (tbuff, "0x%08x", &bpaddr) != 1)
+ {
+ fprintf_unfiltered (stderr, "Invalid hex address from target: %s\n", tbuff);
+ return 1;
+ }
+
+ if (bpnum >= PMON_MAX_BP)
+ {
+ fprintf_unfiltered (stderr, "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n",
+ bpnum, PMON_MAX_BP - 1);
+ return 1;
+ }
+
+ if (bpaddr != addr)
+ fprintf_unfiltered (stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr);
+
+ mips_pmon_bp_info[bpnum] = bpaddr;
+
+ mips_expect ("\015\012");
+ mips_expect (mips_monitor_prompt);
+
+ mips_enter_debug ();
+
+ return 0;
+ }
+
+ return mips_store_word (addr, BREAK_INSN, contents_cache);
+}
+
+static int
+pmon_remove_breakpoint (addr, contents_cache)
+ CORE_ADDR addr;
+ char *contents_cache;
+{
+ if (monitor_supports_breakpoints)
+ {
+ int bpnum;
+ char tbuff[7]; /* enough for delete breakpoint command */
+
+ for (bpnum = 0; bpnum < PMON_MAX_BP; bpnum++)
+ if (mips_pmon_bp_info[bpnum] == addr)
+ break;
+
+ if (bpnum >= PMON_MAX_BP)
+ {
+ fprintf_unfiltered (stderr, "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%x\n", addr);
+ return 1;
+ }
+
+ if (mips_exit_debug ())
+ mips_error ("Failed to exit debug mode");
+
+ sprintf (tbuff, "db %02d\015", bpnum);
+
+ mips_send_command (tbuff, -1);
+ /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not
+ set" message will be returned. */
+
+ mips_enter_debug ();
+
+ return 0;
+ }
+
+ return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE);
+}
+#endif
+
+/* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1.
+ This is used for memory ref breakpoints. */
+
+static unsigned long
+calculate_mask (addr, len)
+ CORE_ADDR addr;
+ int len;
+{
+ unsigned long mask;
+ int i;
+
+ mask = addr ^ (addr + len - 1);
+
+ for (i = 32; i >= 0; i--)
+ if (mask == 0)
+ break;
+ else
+ mask >>= 1;
+
+ mask = (unsigned long) 0xffffffff >> i;
+
+ return mask;
+}
+
+/* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is either 1
+ for a read watchpoint, or 2 for a read/write watchpoint. */
+
+int
+remote_mips_set_watchpoint (addr, len, type)
+ CORE_ADDR addr;
+ int len;
+ int type;
+{
+ CORE_ADDR first_addr;
+ unsigned long mask;
+ char *flags;
+
+ mask = calculate_mask (addr, len);
+
+ first_addr = addr & ~mask;
+
+ switch (type)
+ {
+ case 0: /* write */
+ flags = "w";
+ break;
+ case 1: /* read */
+ flags = "r";
+ break;
+ case 2: /* read/write */
+ flags = "rw";
+ break;
+ default:
+ abort ();
+ }
+
+ if (common_breakpoint ('B', first_addr, mask, flags))
+ return -1;
+
+ return 0;
+}
+
+int
+remote_mips_remove_watchpoint (addr, len, type)
+ CORE_ADDR addr;
+ int len;
+ int type;
+{
+ CORE_ADDR first_addr;
+ unsigned long mask;
+
+ mask = calculate_mask (addr, len);
+
+ first_addr = addr & ~mask;
+
+ if (common_breakpoint ('b', first_addr, 0, NULL))
+ return -1;
+
+ return 0;
+}
+
+int
+remote_mips_stopped_by_watchpoint ()
+{
+ return hit_watchpoint;
+}
+
+/* This routine generates the a breakpoint command of the form:
+
+ 0x0 <CMD> <ADDR> <MASK> <FLAGS>
+
+ Where <CMD> is one of: `B' to set, or `b' to clear a breakpoint. <ADDR> is
+ the address of the breakpoint. <MASK> is a don't care mask for addresses.
+ <FLAGS> is any combination of `r', `w', or `f' for read/write/or fetch. */
+
+static int
+common_breakpoint (cmd, addr, mask, flags)
+ int cmd;
+ CORE_ADDR addr;
+ CORE_ADDR mask;
+ char *flags;
+{
+ int len;
+ char buf[DATA_MAXLEN + 1];
+ char rcmd;
+ int rpid, rerrflg, rresponse;
+ int nfields;
+
+ if (flags)
+ sprintf (buf, "0x0 %c 0x%x 0x%x %s", cmd, addr, mask, flags);
+ else
+ sprintf (buf, "0x0 %c 0x%x", cmd, addr);
+
+ mips_send_packet (buf, 1);
+
+ len = mips_receive_packet (buf, 1, mips_receive_wait);
+ buf[len] = '\0';
+
+ nfields = sscanf (buf, "0x%x %c 0x%x 0x%x", &rpid, &rcmd, &rerrflg, &rresponse);
+
+ if (nfields != 4
+ || rcmd != cmd)
+ mips_error ("common_breakpoint: Bad response from remote board: %s", buf);
+
+ if (rerrflg != 0)
+ {
+ if (rresponse != 22) /* invalid argument */
+ fprintf_unfiltered (stderr, "common_breakpoint (0x%x): Got error: 0x%x\n",
+ addr, rresponse);
+ return 1;
+ }
+
+ return 0;
+}
+\f
+static void
+send_srec (srec, len, addr)
+ char *srec;
+ int len;
+ CORE_ADDR addr;
+{
+ while (1)
+ {
+ int ch;
+
+ SERIAL_WRITE (mips_desc, srec, len);
+
+ ch = mips_readchar (2);
+
+ switch (ch)
+ {
+ case SERIAL_TIMEOUT:
+ error ("Timeout during download.");
+ break;
+ case 0x6: /* ACK */
+ return;
+ case 0x15: /* NACK */
+ fprintf_unfiltered (gdb_stderr, "Download got a NACK at byte %d! Retrying.\n", addr);
+ continue;
+ default:
+ error ("Download got unexpected ack char: 0x%x, retrying.\n", ch);
+ }
+ }
+}
+
+/* Download a binary file by converting it to S records. */
+
+static void
+mips_load_srec (args)
+ char *args;
+{
+ bfd *abfd;
+ asection *s;
+ char *buffer, srec[1024];
+ int i;
+ int srec_frame = 200;
+ int reclen;
+ static int hashmark = 1;
+
+ buffer = alloca (srec_frame * 2 + 256);
+
+ abfd = bfd_openr (args, 0);
+ if (!abfd)
+ {
+ printf_filtered ("Unable to open file %s\n", args);
+ return;
+ }
+
+ if (bfd_check_format (abfd, bfd_object) == 0)
+ {
+ printf_filtered ("File is not an object file\n");
+ return;
+ }
+
+/* This actually causes a download in the IDT binary format: */
+#define LOAD_CMD "load -b -s tty0\015"
+ mips_send_command (LOAD_CMD, 0);
+
+ for (s = abfd->sections; s; s = s->next)
+ {
+ if (s->flags & SEC_LOAD)
+ {
+ int numbytes;
+
+ printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma,
+ s->vma + s->_raw_size);
+ gdb_flush (gdb_stdout);
+
+ for (i = 0; i < s->_raw_size; i += numbytes)
+ {
+ numbytes = min (srec_frame, s->_raw_size - i);
+
+ bfd_get_section_contents (abfd, s, buffer, i, numbytes);
+
+ reclen = mips_make_srec (srec, '3', s->vma + i, buffer, numbytes);
+ send_srec (srec, reclen, s->vma + i);
+
+ if (hashmark)
+ {
+ putchar_unfiltered ('#');
+ gdb_flush (gdb_stdout);
+ }
+
+ } /* Per-packet (or S-record) loop */
+
+ putchar_unfiltered ('\n');
+ } /* Loadable sections */
+ }
+ if (hashmark)
+ putchar_unfiltered ('\n');
+
+ /* Write a type 7 terminator record. no data for a type 7, and there
+ is no data, so len is 0. */
+
+ reclen = mips_make_srec (srec, '7', abfd->start_address, NULL, 0);
+
+ send_srec (srec, reclen, abfd->start_address);
+
+ SERIAL_FLUSH_INPUT (mips_desc);
+}
+
+/*
+ * mips_make_srec -- make an srecord. This writes each line, one at a
+ * time, each with it's own header and trailer line.
+ * An srecord looks like this:
+ *
+ * byte count-+ address
+ * start ---+ | | data +- checksum
+ * | | | |
+ * S01000006F6B692D746573742E73726563E4
+ * S315000448600000000000000000FC00005900000000E9
+ * S31A0004000023C1400037DE00F023604000377B009020825000348D
+ * S30B0004485A0000000000004E
+ * S70500040000F6
+ *
+ * S<type><length><address><data><checksum>
+ *
+ * Where
+ * - length
+ * is the number of bytes following upto the checksum. Note that
+ * this is not the number of chars following, since it takes two
+ * chars to represent a byte.
+ * - type
+ * is one of:
+ * 0) header record
+ * 1) two byte address data record
+ * 2) three byte address data record
+ * 3) four byte address data record
+ * 7) four byte address termination record
+ * 8) three byte address termination record
+ * 9) two byte address termination record
+ *
+ * - address
+ * is the start address of the data following, or in the case of
+ * a termination record, the start address of the image
+ * - data
+ * is the data.
+ * - checksum
+ * is the sum of all the raw byte data in the record, from the length
+ * upwards, modulo 256 and subtracted from 255.
+ *
+ * This routine returns the length of the S-record.
+ *
+ */
+
+static int
+mips_make_srec (buf, type, memaddr, myaddr, len)
+ char *buf;
+ int type;
+ CORE_ADDR memaddr;
+ unsigned char *myaddr;
+ int len;
+{
+ unsigned char checksum;
+ int i;
+
+ /* Create the header for the srec. addr_size is the number of bytes in the address,
+ and 1 is the number of bytes in the count. */
+
+ buf[0] = 'S';
+ buf[1] = type;
+ buf[2] = len + 4 + 1; /* len + 4 byte address + 1 byte checksum */
+ /* This assumes S3 style downloads (4byte addresses). There should
+ probably be a check, or the code changed to make it more
+ explicit. */
+ buf[3] = memaddr >> 24;
+ buf[4] = memaddr >> 16;
+ buf[5] = memaddr >> 8;
+ buf[6] = memaddr;
+ memcpy (&buf[7], myaddr, len);
+
+ /* Note that the checksum is calculated on the raw data, not the
+ hexified data. It includes the length, address and the data
+ portions of the packet. */
+ checksum = 0;
+ buf += 2; /* Point at length byte */
+ for (i = 0; i < len + 4 + 1; i++)
+ checksum += *buf++;
+
+ *buf = ~checksum;
+
+ return len + 8;
+}
+
+/* The following manifest controls whether we enable the simple flow
+ control support provided by the monitor. If enabled the code will
+ wait for an affirmative ACK between transmitting packets. */
+#define DOETXACK (1)
+
+/* The PMON fast-download uses an encoded packet format constructed of
+ 3byte data packets (encoded as 4 printable ASCII characters), and
+ escape sequences (preceded by a '/'):
+
+ 'K' clear checksum
+ 'C' compare checksum (12bit value, not included in checksum calculation)
+ 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary
+ 'Z' zero fill multiple of 3bytes
+ 'B' byte (12bit encoded value, of 8bit data)
+ 'A' address (36bit encoded value)
+ 'E' define entry as original address, and exit load
+
+ The packets are processed in 4 character chunks, so the escape
+ sequences that do not have any data (or variable length data)
+ should be padded to a 4 character boundary. The decoder will give
+ an error if the complete message block size is not a multiple of
+ 4bytes (size of record).
+
+ The encoding of numbers is done in 6bit fields. The 6bit value is
+ used to index into this string to get the specific character
+ encoding for the value: */
+static char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,.";
+
+/* Convert the number of bits required into an encoded number, 6bits
+ at a time (range 0..63). Keep a checksum if required (passed
+ pointer non-NULL). The function returns the number of encoded
+ characters written into the buffer. */
+static int
+pmon_makeb64 (v, p, n, chksum)
+ unsigned long v;
+ char *p;
+ int n;
+ int *chksum;
+{
+ int count = (n / 6);
+
+ if ((n % 12) != 0) {
+ fprintf_unfiltered(stderr,"Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n",n,(n == 1)?"":"s");
+ return(0);
+ }
+ if (n > 36) {
+ fprintf_unfiltered(stderr,"Fast encoding cannot process more than 36bits at the moment: %dbits\n",n);
+ return(0);
+ }
+
+ /* Deal with the checksum: */
+ if (chksum != NULL) {
+ switch (n) {
+ case 36: *chksum += ((v >> 24) & 0xFFF);
+ case 24: *chksum += ((v >> 12) & 0xFFF);
+ case 12: *chksum += ((v >> 0) & 0xFFF);
+ }
+ }
+
+ do {
+ n -= 6;
+ *p++ = encoding[(v >> n) & 0x3F];
+ } while (n > 0);
+
+ return(count);
+}
+
+/* Shorthand function (that could be in-lined) to output the zero-fill
+ escape sequence into the data stream. */
+static int
+pmon_zeroset (recsize, buff, amount, chksum)
+ int recsize;
+ char **buff;
+ int *amount;
+ unsigned int *chksum;
+{
+ int count;
+
+ sprintf(*buff,"/Z");
+ count = pmon_makeb64 (*amount, (*buff + 2), 12, chksum);
+ *buff += (count + 2);
+ *amount = 0;
+ return(recsize + count + 2);
+}
+
+static int
+pmon_checkset (recsize, buff, value)
+ int recsize;
+ char **buff;
+ int *value;
+{
+ int count;
+
+ /* Add the checksum (without updating the value): */
+ sprintf (*buff, "/C");
+ count = pmon_makeb64 (*value, (*buff + 2), 12, NULL);
+ *buff += (count + 2);
+ sprintf (*buff, "\015");
+ *buff += 2; /* include zero terminator */
+ /* Forcing a checksum validation clears the sum: */
+ *value = 0;
+ return(recsize + count + 3);
+}
+
+/* Amount of padding we leave after at the end of the output buffer,
+ for the checksum and line termination characters: */
+#define CHECKSIZE (4 + 4 + 4 + 2)
+/* zero-fill, checksum, transfer end and line termination space. */
+
+/* The amount of binary data loaded from the object file in a single
+ operation: */
+#define BINCHUNK (1024)
+
+/* Maximum line of data accepted by the monitor: */
+#define MAXRECSIZE (550)
+/* NOTE: This constant depends on the monitor being used. This value
+ is for PMON 5.x on the Cogent Vr4300 board. */
+
+static void
+pmon_make_fastrec (outbuf, inbuf, inptr, inamount, recsize, csum, zerofill)
+ char **outbuf;
+ unsigned char *inbuf;
+ int *inptr;
+ int inamount;
+ int *recsize;
+ unsigned int *csum;
+ unsigned int *zerofill;
+{
+ int count = 0;
+ char *p = *outbuf;
+
+ /* This is a simple check to ensure that our data will fit within
+ the maximum allowable record size. Each record output is 4bytes
+ in length. We must allow space for a pending zero fill command,
+ the record, and a checksum record. */
+ while ((*recsize < (MAXRECSIZE - CHECKSIZE)) && ((inamount - *inptr) > 0)) {
+ /* Process the binary data: */
+ if ((inamount - *inptr) < 3) {
+ if (*zerofill != 0)
+ *recsize = pmon_zeroset (*recsize, &p, zerofill, csum);
+ sprintf (p, "/B");
+ count = pmon_makeb64 (inbuf[*inptr], &p[2], 12, csum);
+ p += (2 + count);
+ *recsize += (2 + count);
+ (*inptr)++;
+ } else {
+ unsigned int value = ((inbuf[*inptr + 0] << 16) | (inbuf[*inptr + 1] << 8) | inbuf[*inptr + 2]);
+ /* Simple check for zero data. TODO: A better check would be
+ to check the last, and then the middle byte for being zero
+ (if the first byte is not). We could then check for
+ following runs of zeros, and if above a certain size it is
+ worth the 4 or 8 character hit of the byte insertions used
+ to pad to the start of the zeroes. NOTE: This also depends
+ on the alignment at the end of the zero run. */
+ if (value == 0x00000000) {
+ (*zerofill)++;
+ if (*zerofill == 0xFFF) /* 12bit counter */
+ *recsize = pmon_zeroset (*recsize, &p, zerofill, csum);
+ }else {
+ if (*zerofill != 0)
+ *recsize = pmon_zeroset (*recsize, &p, zerofill, csum);
+ count = pmon_makeb64 (value, p, 24, csum);
+ p += count;
+ *recsize += count;
+ }
+ *inptr += 3;
+ }
+ }
+
+ *outbuf = p;
+ return;
+}
+
+#if defined(DOETXACK)
+static int
+pmon_check_ack()
+{
+ int c = SERIAL_READCHAR (mips_desc, 2);
+ if ((c == SERIAL_TIMEOUT) || (c != 0x06)) {
+ fprintf_unfiltered (gdb_stderr, "Failed to receive valid ACK\n");
+ return(-1); /* terminate the download */
+ }
+ return(0);
+}
+#endif /* DOETXACK */
+
+static void
+pmon_load_fast (file)
+ char *file;
+{
+ bfd *abfd;
+ asection *s;
+ unsigned char *binbuf;
+ char *buffer;
+ int reclen;
+ unsigned int csum = 0;
+ static int hashmark = 1;
+ int bintotal = 0;
+ int final;
+ int finished = 0;
+
+ buffer = (char *)xmalloc(MAXRECSIZE + 1);
+ binbuf = (unsigned char *)xmalloc(BINCHUNK);
+
+ abfd = bfd_openr(file,0);
+ if (!abfd)
+ {
+ printf_filtered ("Unable to open file %s\n",file);
+ return;
+ }
+
+ if (bfd_check_format(abfd,bfd_object) == 0)
+ {
+ printf_filtered("File is not an object file\n");
+ return;
+ }
+
+ /* Setup the required download state: */
+ mips_send_command ("set dlproto etxack\015", -1);
+ mips_send_command ("set dlecho off\015", -1);
+ /* NOTE: We get a "cannot set variable" message if the variable is
+ already defined to have the argument we give. The code doesn't
+ care, since it just scans to the next prompt anyway. */
+ /* Start the download: */
+ mips_send_command (LOAD_CMD, 0);
+ mips_expect ("Downloading from tty0, ^C to abort\015\012");
+
+ /* Zero the checksum */
+ sprintf(buffer,"/Kxx\015");
+ reclen = strlen(buffer);
+ SERIAL_WRITE (mips_desc, buffer, reclen);
+
+#if defined(DOETXACK)
+ finished = pmon_check_ack();
+#endif /* DOETXACK */
+
+ for (s = abfd->sections; s && !finished; s = s->next)
+ if (s->flags & SEC_LOAD) /* only deal with loadable sections */
+ {
+ bintotal += s->_raw_size;
+ final = (s->vma + s->_raw_size);
+
+ printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma,
+ s->vma + s->_raw_size);
+ gdb_flush (gdb_stdout);
+
+ /* Output the starting address */
+ sprintf(buffer,"/A");
+ reclen = pmon_makeb64(s->vma,&buffer[2],36,&csum);
+ buffer[2 + reclen] = '\015';
+ buffer[3 + reclen] = '\0';
+ reclen += 3; /* for the initial escape code and carriage return */
+ SERIAL_WRITE (mips_desc, buffer, reclen);
+#if defined(DOETXACK)
+ finished = pmon_check_ack();
+#endif /* DOETXACK */
+
+ if (!finished)
+ {
+ int binamount;
+ unsigned int zerofill = 0;
+ char *bp = buffer;
+ int i;
+
+ reclen = 0;
+
+ for (i = 0; ((i < s->_raw_size) && !finished); i += binamount) {
+ int binptr = 0;
+
+ binamount = min (BINCHUNK, s->_raw_size - i);
+
+ bfd_get_section_contents (abfd, s, binbuf, i, binamount);
+
+ /* This keeps a rolling checksum, until we decide to output
+ the line: */
+ for (; ((binamount - binptr) > 0);) {
+ pmon_make_fastrec (&bp, binbuf, &binptr, binamount, &reclen, &csum, &zerofill);
+ if (reclen >= (MAXRECSIZE - CHECKSIZE)) {
+ reclen = pmon_checkset (reclen, &bp, &csum);
+ SERIAL_WRITE (mips_desc, buffer, reclen);
+#if defined(DOETXACK)
+ finished = pmon_check_ack();
+ if (finished) {
+ zerofill = 0; /* do not transmit pending zerofills */
+ break;
+ }
+#endif /* DOETXACK */
+
+ if (hashmark) {
+ putchar_unfiltered ('#');
+ gdb_flush (gdb_stdout);
+ }
+
+ bp = buffer;
+ reclen = 0; /* buffer processed */
+ }
+ }
+ }
+
+ /* Ensure no out-standing zerofill requests: */
+ if (zerofill != 0)
+ reclen = pmon_zeroset (reclen, &bp, &zerofill, &csum);
+
+ /* and then flush the line: */
+ if (reclen > 0) {
+ reclen = pmon_checkset (reclen, &bp, &csum);
+ /* Currently pmon_checkset outputs the line terminator by
+ default, so we write out the buffer so far: */
+ SERIAL_WRITE (mips_desc, buffer, reclen);
+#if defined(DOETXACK)
+ finished = pmon_check_ack();
+#endif /* DOETXACK */
+ }
+ }
+
+ if (hashmark)
+ putchar_unfiltered ('\n');
+ }
+
+ /* Terminate the transfer. We know that we have an empty output
+ buffer at this point. */
+ sprintf (buffer, "/E/E\015"); /* include dummy padding characters */
+ reclen = strlen (buffer);
+ SERIAL_WRITE (mips_desc, buffer, reclen);
+
+ if (finished) { /* Ignore the termination message: */
+ SERIAL_FLUSH_INPUT (mips_desc);
+ } else { /* Deal with termination message: */
+ char hexnumber[9]; /* includes '\0' space */
+ mips_expect ("Entry Address = ");
+ sprintf(hexnumber,"%x",final);
+ mips_expect (hexnumber);
+#if defined(DOETXACK)
+ mips_expect ("\015\012\006\015\012total = 0x");
+#else /* normal termination */
+ mips_expect ("\015\012\015\012total = 0x");
+#endif /* !DOETXACK */
+ sprintf(hexnumber,"%x",bintotal);
+ mips_expect (hexnumber);
+ mips_expect (" bytes\015\012");
+ }
+
+ return;
+}
+
+/* mips_load -- download a file. */
+
+static void
+mips_load (file, from_tty)
+ char *file;
+ int from_tty;
+{
+ /* Get the board out of remote debugging mode. */
+ if (mips_exit_debug ())
+ error ("mips_load: Couldn't get into monitor mode.");
+
+ if (mips_monitor == MON_PMON)
+ pmon_load_fast (file);
+ else
+ mips_load_srec (file);
+
+ mips_initialize ();
+
+/* Finally, make the PC point at the start address */
+
+ if (exec_bfd)
+ write_pc (bfd_get_start_address (exec_bfd));
+
+ inferior_pid = 0; /* No process now */
+
+/* This is necessary because many things were based on the PC at the time that
+ we attached to the monitor, which is no longer valid now that we have loaded
+ new code (and just changed the PC). Another way to do this might be to call
+ normal_stop, except that the stack may not be valid, and things would get
+ horribly confused... */
+
+ clear_symtab_users ();
+}
+\f
+/* The target vector. */
+
+struct target_ops mips_ops =
+{
+ "mips", /* to_shortname */
+ "Remote MIPS debugging over serial line", /* to_longname */
+ "\
+Debug a board using the MIPS remote debugging protocol over a serial line.\n\
+The argument is the device it is connected to or, if it contains a colon,\n\
+HOST:PORT to access a board over a network", /* to_doc */
+ mips_open, /* to_open */
+ mips_close, /* to_close */
+ NULL, /* to_attach */
mips_detach, /* to_detach */
mips_resume, /* to_resume */
mips_wait, /* to_wait */
NULL, /* to_terminal_ours */
NULL, /* to_terminal_info */
mips_kill, /* to_kill */
- generic_load, /* to_load */
+ mips_load, /* to_load */
NULL, /* to_lookup_symbol */
mips_create_inferior, /* to_create_inferior */
mips_mourn_inferior, /* to_mourn_inferior */
NULL, /* to_can_run */
NULL, /* 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 */
+};
+\f
+/* An alternative target vector: */
+struct target_ops pmon_ops =
+{
+ "pmon", /* to_shortname */
+ "Remote MIPS debugging over serial line", /* to_longname */
+ "\
+Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
+line. The argument is the device it is connected to or, if it contains a\n\
+colon, HOST:PORT to access a board over a network", /* to_doc */
+ pmon_open, /* to_open */
+ mips_close, /* to_close */
+ NULL, /* to_attach */
+ mips_detach, /* to_detach */
+ mips_resume, /* to_resume */
+ pmon_wait, /* to_wait */
+ mips_fetch_registers, /* to_fetch_registers */
+ mips_store_registers, /* to_store_registers */
+ mips_prepare_to_store, /* to_prepare_to_store */
+ mips_xfer_memory, /* to_xfer_memory */
+ mips_files_info, /* to_files_info */
+ mips_insert_breakpoint, /* to_insert_breakpoint */
+ mips_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 */
+ mips_kill, /* to_kill */
+ mips_load, /* to_load */
+ NULL, /* to_lookup_symbol */
+ mips_create_inferior, /* to_create_inferior */
+ mips_mourn_inferior, /* to_mourn_inferior */
+ NULL, /* to_can_run */
+ NULL, /* to_notice_signals */
+ 0, /* to_thread_alive */
0, /* to_stop */
process_stratum, /* to_stratum */
NULL, /* to_next */
_initialize_remote_mips ()
{
add_target (&mips_ops);
+ add_target (&pmon_ops);
add_show_from_set (
add_set_cmd ("timeout", no_class, var_zinteger,
This is the number of seconds to wait for an acknowledgement to a packet\n\
before resending the packet.", &setlist),
&showlist);
+
+ add_show_from_set (
+ add_set_cmd ("syn-garbage-limit", no_class, var_zinteger,
+ (char *) &mips_syn_garbage,
+"Set the maximum number of characters to ignore when scanning for a SYN.\n\
+This is the maximum number of characters GDB will ignore when trying to\n\
+synchronize with the remote system. A value of -1 means that there is no limit\n\
+(Note that these characters are printed out even though they are ignored.)",
+ &setlist),
+ &showlist);
}