mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-23 01:03:28 +08:00
1db0c2f75c
* remote-mips.c (pmon_wait): CAIRO PMON does not require forced re-entry back into debug mode.
3108 lines
87 KiB
C
3108 lines
87 KiB
C
/* Remote debugging interface for MIPS remote debugging protocol.
|
||
Copyright 1993, 1994, 1995 Free Software Foundation, Inc.
|
||
Contributed by Cygnus Support. Written by Ian Lance Taylor
|
||
<ian@cygnus.com>.
|
||
|
||
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. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "bfd.h"
|
||
#include "symfile.h"
|
||
#include "wait.h"
|
||
#include "gdbcmd.h"
|
||
#include "gdbcore.h"
|
||
#include "serial.h"
|
||
#include "target.h"
|
||
#include "remote-utils.h"
|
||
|
||
#include <signal.h>
|
||
#ifdef ANSI_PROTOTYPES
|
||
#include <stdarg.h>
|
||
#else
|
||
#include <varargs.h>
|
||
#endif
|
||
|
||
extern void mips_set_processor_type_command PARAMS ((char *, int));
|
||
|
||
|
||
/* Prototypes for local functions. */
|
||
|
||
static int mips_readchar PARAMS ((int timeout));
|
||
|
||
static int mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage,
|
||
int ch, int timeout));
|
||
|
||
static int mips_receive_trailer PARAMS ((unsigned char *trlr, int *pgarbage,
|
||
int *pch, int timeout));
|
||
|
||
static int mips_cksum PARAMS ((const unsigned char *hdr,
|
||
const unsigned char *data,
|
||
int len));
|
||
|
||
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 ((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 cairo_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 void mips_resume PARAMS ((int pid, int step,
|
||
enum target_signal siggnal));
|
||
|
||
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_prepare_to_store PARAMS ((void));
|
||
|
||
static void mips_store_registers PARAMS ((int regno));
|
||
|
||
static int mips_fetch_word PARAMS ((CORE_ADDR addr));
|
||
|
||
static int mips_store_word PARAMS ((CORE_ADDR addr, int value,
|
||
char *old_contents));
|
||
|
||
static int mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
|
||
int write, struct target_ops *ignore));
|
||
|
||
static void mips_files_info PARAMS ((struct target_ops *ignore));
|
||
|
||
static void mips_create_inferior PARAMS ((char *execfile, char *args,
|
||
char **env));
|
||
|
||
static void mips_mourn_inferior PARAMS ((void));
|
||
|
||
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;
|
||
extern struct target_ops cairo_ops;
|
||
|
||
/* The MIPS remote debugging interface is built on top of a simple
|
||
packet protocol. Each packet is organized as follows:
|
||
|
||
SYN The first character is always a SYN (ASCII 026, or ^V). SYN
|
||
may not appear anywhere else in the packet. Any time a SYN is
|
||
seen, a new packet should be assumed to have begun.
|
||
|
||
TYPE_LEN
|
||
This byte contains the upper five bits of the logical length
|
||
of the data section, plus a single bit indicating whether this
|
||
is a data packet or an acknowledgement. The documentation
|
||
indicates that this bit is 1 for a data packet, but the actual
|
||
board uses 1 for an acknowledgement. The value of the byte is
|
||
0x40 + (ack ? 0x20 : 0) + (len >> 6)
|
||
(we always have 0 <= len < 1024). Acknowledgement packets do
|
||
not carry data, and must have a data length of 0.
|
||
|
||
LEN1 This byte contains the lower six bits of the logical length of
|
||
the data section. The value is
|
||
0x40 + (len & 0x3f)
|
||
|
||
SEQ This byte contains the six bit sequence number of the packet.
|
||
The value is
|
||
0x40 + seq
|
||
An acknowlegment packet contains the sequence number of the
|
||
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 previous packet is received (i.e., an acknowledgement with
|
||
the sequence number of the packet just sent) the packet just
|
||
sent should be retransmitted. If no acknowledgement is
|
||
received within a timeout period, the packet should be
|
||
retransmitted. This has an unfortunate failure condition on a
|
||
high-latency line, as a delayed acknowledgement may lead to an
|
||
endless series of duplicate packets.
|
||
|
||
DATA The actual data bytes follow. The following characters are
|
||
escaped inline with DLE (ASCII 020, or ^P):
|
||
SYN (026) DLE S
|
||
DLE (020) DLE D
|
||
^C (003) DLE C
|
||
^S (023) DLE s
|
||
^Q (021) DLE q
|
||
The additional DLE characters are not counted in the logical
|
||
length stored in the TYPE_LEN and LEN1 bytes.
|
||
|
||
CSUM1
|
||
CSUM2
|
||
CSUM3
|
||
These bytes contain an 18 bit checksum of the complete
|
||
contents of the packet excluding the SEQ byte and the
|
||
CSUM[123] bytes. The checksum is simply the twos complement
|
||
addition of all the bytes treated as unsigned characters. The
|
||
values of the checksum bytes are:
|
||
CSUM1: 0x40 + ((cksum >> 12) & 0x3f)
|
||
CSUM2: 0x40 + ((cksum >> 6) & 0x3f)
|
||
CSUM3: 0x40 + (cksum & 0x3f)
|
||
|
||
It happens that the MIPS remote debugging protocol always
|
||
communicates with ASCII strings. Because of this, this
|
||
implementation doesn't bother to handle the DLE quoting mechanism,
|
||
since it will never be required. */
|
||
|
||
/* The SYN character which starts each packet. */
|
||
#define SYN '\026'
|
||
|
||
/* The 0x40 used to offset each packet (this value ensures that all of
|
||
the header and trailer bytes, other than SYN, are printable ASCII
|
||
characters). */
|
||
#define HDR_OFFSET 0x40
|
||
|
||
/* The indices of the bytes in the packet header. */
|
||
#define HDR_INDX_SYN 0
|
||
#define HDR_INDX_TYPE_LEN 1
|
||
#define HDR_INDX_LEN1 2
|
||
#define HDR_INDX_SEQ 3
|
||
#define HDR_LENGTH 4
|
||
|
||
/* The data/ack bit in the TYPE_LEN header byte. */
|
||
#define TYPE_LEN_DA_BIT 0x20
|
||
#define TYPE_LEN_DATA 0
|
||
#define TYPE_LEN_ACK TYPE_LEN_DA_BIT
|
||
|
||
/* How to compute the header bytes. */
|
||
#define HDR_SET_SYN(data, len, seq) (SYN)
|
||
#define HDR_SET_TYPE_LEN(data, len, seq) \
|
||
(HDR_OFFSET \
|
||
+ ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \
|
||
+ (((len) >> 6) & 0x1f))
|
||
#define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f))
|
||
#define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq))
|
||
|
||
/* Check that a header byte is reasonable. */
|
||
#define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET)
|
||
|
||
/* Get data from the header. These macros evaluate their argument
|
||
multiple times. */
|
||
#define HDR_IS_DATA(hdr) \
|
||
(((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA)
|
||
#define HDR_GET_LEN(hdr) \
|
||
((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f)))
|
||
#define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f)
|
||
|
||
/* The maximum data length. */
|
||
#define DATA_MAXLEN 1023
|
||
|
||
/* The trailer offset. */
|
||
#define TRLR_OFFSET HDR_OFFSET
|
||
|
||
/* The indices of the bytes in the packet trailer. */
|
||
#define TRLR_INDX_CSUM1 0
|
||
#define TRLR_INDX_CSUM2 1
|
||
#define TRLR_INDX_CSUM3 2
|
||
#define TRLR_LENGTH 3
|
||
|
||
/* How to compute the trailer bytes. */
|
||
#define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f))
|
||
#define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f))
|
||
#define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f))
|
||
|
||
/* Check that a trailer byte is reasonable. */
|
||
#define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET)
|
||
|
||
/* Get data from the trailer. This evaluates its argument multiple
|
||
times. */
|
||
#define TRLR_GET_CKSUM(trlr) \
|
||
((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \
|
||
+ (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \
|
||
+ ((trlr)[TRLR_INDX_CSUM3] & 0x3f))
|
||
|
||
/* 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, /* 3.0.83 [COGENT,EB,FP,NET] Algorithmics Ltd. Nov 9 1995 17:19:50 */
|
||
MON_CAIRO, /* 2.7.473 [Cairo ,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */
|
||
/* 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 unsigned int mips_send_seq;
|
||
|
||
/* The next sequence number we expect to receive. */
|
||
static unsigned int mips_receive_seq;
|
||
|
||
/* The time to wait before retransmitting a packet, in seconds. */
|
||
static int mips_retransmit_wait = 3;
|
||
|
||
/* The number of times to try retransmitting a packet before giving up. */
|
||
static int mips_send_retries = 10;
|
||
|
||
/* The number of garbage characters to accept when looking for an
|
||
SYN for the next packet. */
|
||
static int mips_syn_garbage = 1050;
|
||
|
||
/* The time to wait for a packet, in seconds. */
|
||
static int mips_receive_wait = 5;
|
||
|
||
/* Set if we have sent a packet to the board but have not yet received
|
||
a reply. */
|
||
static int mips_need_reply = 0;
|
||
|
||
/* 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
|
||
inconsistent state. */
|
||
|
||
static NORETURN void
|
||
#ifdef ANSI_PROTOTYPES
|
||
mips_error (char *string, ...)
|
||
#else
|
||
mips_error (va_alist)
|
||
va_dcl
|
||
#endif
|
||
{
|
||
va_list args;
|
||
|
||
#ifdef ANSI_PROTOTYPES
|
||
va_start (args, string);
|
||
#else
|
||
char *string;
|
||
va_start (args);
|
||
string = va_arg (args, char *);
|
||
#endif
|
||
|
||
target_terminal_ours ();
|
||
wrap_here(""); /* Force out any buffered output */
|
||
gdb_flush (gdb_stdout);
|
||
if (error_pre_print)
|
||
fprintf_filtered (gdb_stderr, error_pre_print);
|
||
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
|
||
it). */
|
||
mips_is_open = 0;
|
||
SERIAL_CLOSE (mips_desc);
|
||
|
||
printf_unfiltered ("Ending remote MIPS debugging.\n");
|
||
target_mourn_inferior ();
|
||
|
||
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 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
|
||
convenient for DejaGnu when you only have one connected serial
|
||
port. */
|
||
|
||
static int
|
||
mips_readchar (timeout)
|
||
int timeout;
|
||
{
|
||
int ch;
|
||
static int state = 0;
|
||
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 == 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 (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. */
|
||
if (ch != SERIAL_TIMEOUT)
|
||
printf_unfiltered ("Read '%c' %d 0x%x\n", ch, ch, ch);
|
||
else
|
||
printf_unfiltered ("Timed out in read\n");
|
||
}
|
||
|
||
/* 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 == mips_monitor_prompt_len
|
||
&& ! mips_initializing)
|
||
{
|
||
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");
|
||
|
||
mips_need_reply = 0;
|
||
mips_initialize ();
|
||
|
||
state = 0;
|
||
|
||
/* 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 == mips_monitor_prompt[state])
|
||
++state;
|
||
else
|
||
state = 0;
|
||
|
||
return ch;
|
||
}
|
||
|
||
/* Get a packet header, putting the data in the supplied buffer.
|
||
PGARBAGE is a pointer to the number of garbage characters received
|
||
so far. CH is the last character received. Returns 0 for success,
|
||
or -1 for timeout. */
|
||
|
||
static int
|
||
mips_receive_header (hdr, pgarbage, ch, timeout)
|
||
unsigned char *hdr;
|
||
int *pgarbage;
|
||
int ch;
|
||
int timeout;
|
||
{
|
||
int i;
|
||
|
||
while (1)
|
||
{
|
||
/* Wait for a SYN. mips_syn_garbage is intended to prevent
|
||
sitting here indefinitely if the board sends us one garbage
|
||
character per second. ch may already have a value from the
|
||
last time through the loop. */
|
||
while (ch != SYN)
|
||
{
|
||
ch = mips_readchar (timeout);
|
||
if (ch == SERIAL_TIMEOUT)
|
||
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 || remote_debug > 0)
|
||
{
|
||
/* 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 (mips_syn_garbage > 0
|
||
&& *pgarbage > mips_syn_garbage)
|
||
mips_error ("Debug protocol failure: more than %d characters before a sync.",
|
||
mips_syn_garbage);
|
||
}
|
||
}
|
||
|
||
/* Get the packet header following the SYN. */
|
||
for (i = 1; i < HDR_LENGTH; i++)
|
||
{
|
||
ch = mips_readchar (timeout);
|
||
if (ch == SERIAL_TIMEOUT)
|
||
return -1;
|
||
/* Make sure this is a header byte. */
|
||
if (ch == SYN || ! HDR_CHECK (ch))
|
||
break;
|
||
|
||
hdr[i] = ch;
|
||
}
|
||
|
||
/* If we got the complete header, we can return. Otherwise we
|
||
loop around and keep looking for SYN. */
|
||
if (i >= HDR_LENGTH)
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* Get a packet header, putting the data in the supplied buffer.
|
||
PGARBAGE is a pointer to the number of garbage characters received
|
||
so far. The last character read is returned in *PCH. Returns 0
|
||
for success, -1 for timeout, -2 for error. */
|
||
|
||
static int
|
||
mips_receive_trailer (trlr, pgarbage, pch, timeout)
|
||
unsigned char *trlr;
|
||
int *pgarbage;
|
||
int *pch;
|
||
int timeout;
|
||
{
|
||
int i;
|
||
int ch;
|
||
|
||
for (i = 0; i < TRLR_LENGTH; i++)
|
||
{
|
||
ch = mips_readchar (timeout);
|
||
*pch = ch;
|
||
if (ch == SERIAL_TIMEOUT)
|
||
return -1;
|
||
if (! TRLR_CHECK (ch))
|
||
return -2;
|
||
trlr[i] = ch;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Get the checksum of a packet. HDR points to the packet header.
|
||
DATA points to the packet data. LEN is the length of DATA. */
|
||
|
||
static int
|
||
mips_cksum (hdr, data, len)
|
||
const unsigned char *hdr;
|
||
const unsigned char *data;
|
||
int len;
|
||
{
|
||
register const unsigned char *p;
|
||
register int c;
|
||
register int cksum;
|
||
|
||
cksum = 0;
|
||
|
||
/* The initial SYN is not included in the checksum. */
|
||
c = HDR_LENGTH - 1;
|
||
p = hdr + 1;
|
||
while (c-- != 0)
|
||
cksum += *p++;
|
||
|
||
c = len;
|
||
p = data;
|
||
while (c-- != 0)
|
||
cksum += *p++;
|
||
|
||
return cksum;
|
||
}
|
||
|
||
/* Send a packet containing the given ASCII string. */
|
||
|
||
static void
|
||
mips_send_packet (s, get_ack)
|
||
const char *s;
|
||
int get_ack;
|
||
{
|
||
unsigned int len;
|
||
unsigned char *packet;
|
||
register int cksum;
|
||
int try;
|
||
|
||
len = strlen (s);
|
||
if (len > DATA_MAXLEN)
|
||
mips_error ("MIPS protocol data packet too long: %s", s);
|
||
|
||
packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1);
|
||
|
||
packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq);
|
||
packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq);
|
||
packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq);
|
||
packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq);
|
||
|
||
memcpy (packet + HDR_LENGTH, s, len);
|
||
|
||
cksum = mips_cksum (packet, packet + HDR_LENGTH, len);
|
||
packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum);
|
||
packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
|
||
packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
|
||
|
||
/* Increment the sequence number. This will set mips_send_seq to
|
||
the sequence number we expect in the acknowledgement. */
|
||
mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS;
|
||
|
||
/* 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. */
|
||
for (try = 0; try < mips_send_retries; try++)
|
||
{
|
||
int garbage;
|
||
int ch;
|
||
|
||
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. */
|
||
packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0';
|
||
printf_unfiltered ("Writing \"%s\"\n", packet + 1);
|
||
}
|
||
|
||
if (SERIAL_WRITE (mips_desc, packet,
|
||
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)
|
||
{
|
||
unsigned char hdr[HDR_LENGTH + 1];
|
||
unsigned char trlr[TRLR_LENGTH + 1];
|
||
int err;
|
||
int seq;
|
||
|
||
/* Get the packet header. If we time out, resend the data
|
||
packet. */
|
||
err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait);
|
||
if (err != 0)
|
||
break;
|
||
|
||
ch = 0;
|
||
|
||
/* If we get a data packet, assume it is a duplicate and
|
||
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)) {
|
||
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)
|
||
continue;
|
||
|
||
/* Get the packet trailer. */
|
||
err = mips_receive_trailer (trlr, &garbage, &ch,
|
||
mips_retransmit_wait);
|
||
|
||
/* If we timed out, resend the data packet. */
|
||
if (err == -1)
|
||
break;
|
||
|
||
/* If we got a bad character, reread the header. */
|
||
if (err != 0)
|
||
continue;
|
||
|
||
/* If the checksum does not match the trailer checksum, this
|
||
is a bad packet; ignore it. */
|
||
if (mips_cksum (hdr, (unsigned char *) NULL, 0)
|
||
!= TRLR_GET_CKSUM (trlr))
|
||
continue;
|
||
|
||
if (remote_debug > 0)
|
||
{
|
||
hdr[HDR_LENGTH] = '\0';
|
||
trlr[TRLR_LENGTH] = '\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 ("Got ack %d \"%s%s\"\n",
|
||
HDR_GET_SEQ (hdr), hdr + 1, trlr);
|
||
}
|
||
|
||
/* If this ack is for the current packet, we're done. */
|
||
seq = HDR_GET_SEQ (hdr);
|
||
if (seq == mips_send_seq)
|
||
return;
|
||
|
||
/* If this ack is for the last packet, resend the current
|
||
packet. */
|
||
if ((seq + 1) % SEQ_MODULOS == mips_send_seq)
|
||
break;
|
||
|
||
/* Otherwise this is a bad ack; ignore it. Increment the
|
||
garbage count to ensure that we do not stay in this loop
|
||
forever. */
|
||
++garbage;
|
||
}
|
||
}
|
||
|
||
mips_error ("Remote did not acknowledge packet");
|
||
}
|
||
|
||
/* Receive and acknowledge a packet, returning the data in BUFF (which
|
||
should be DATA_MAXLEN + 1 bytes). The protocol documentation
|
||
implies that only the sender retransmits packets, so this code just
|
||
waits silently for a packet. It returns the length of the received
|
||
packet. If THROW_ERROR is nonzero, call error() on errors. If not,
|
||
don't print an error message and return -1. */
|
||
|
||
static int
|
||
mips_receive_packet (buff, throw_error, timeout)
|
||
char *buff;
|
||
int throw_error;
|
||
int timeout;
|
||
{
|
||
int ch;
|
||
int garbage;
|
||
int len;
|
||
unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1];
|
||
int cksum;
|
||
|
||
ch = 0;
|
||
garbage = 0;
|
||
while (1)
|
||
{
|
||
unsigned char hdr[HDR_LENGTH];
|
||
unsigned char trlr[TRLR_LENGTH];
|
||
int i;
|
||
int err;
|
||
|
||
if (mips_receive_header (hdr, &garbage, ch, timeout) != 0)
|
||
{
|
||
if (throw_error)
|
||
mips_error ("Timed out waiting for remote packet");
|
||
else
|
||
return -1;
|
||
}
|
||
|
||
ch = 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 (remote_debug > 0)
|
||
printf_unfiltered ("Ignoring unexpected ACK\n");
|
||
continue;
|
||
}
|
||
|
||
len = HDR_GET_LEN (hdr);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
int rch;
|
||
|
||
rch = mips_readchar (timeout);
|
||
if (rch == SYN)
|
||
{
|
||
ch = SYN;
|
||
break;
|
||
}
|
||
if (rch == SERIAL_TIMEOUT)
|
||
{
|
||
if (throw_error)
|
||
mips_error ("Timed out waiting for remote packet");
|
||
else
|
||
return -1;
|
||
}
|
||
buff[i] = rch;
|
||
}
|
||
|
||
if (i < len)
|
||
{
|
||
/* 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 ("Got new SYN after %d chars (wanted %d)\n",
|
||
i, len);
|
||
continue;
|
||
}
|
||
|
||
err = mips_receive_trailer (trlr, &garbage, &ch, timeout);
|
||
if (err == -1)
|
||
{
|
||
if (throw_error)
|
||
mips_error ("Timed out waiting for packet");
|
||
else
|
||
return -1;
|
||
}
|
||
if (err == -2)
|
||
{
|
||
/* 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 ("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;
|
||
|
||
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",
|
||
mips_cksum (hdr, buff, len),
|
||
TRLR_GET_CKSUM (trlr));
|
||
|
||
/* The checksum failed. Send an acknowledgement for the
|
||
previous packet to tell the remote to resend the packet. */
|
||
ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq);
|
||
ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq);
|
||
ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq);
|
||
ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq);
|
||
|
||
cksum = mips_cksum (ack, (unsigned char *) NULL, 0);
|
||
|
||
ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum);
|
||
ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
|
||
ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
|
||
|
||
if (remote_debug > 0)
|
||
{
|
||
ack[HDR_LENGTH + TRLR_LENGTH] = '\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 ("Writing ack %d \"%s\"\n", mips_receive_seq,
|
||
ack + 1);
|
||
}
|
||
|
||
if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0)
|
||
{
|
||
if (throw_error)
|
||
mips_error ("write to target failed: %s", safe_strerror (errno));
|
||
else
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
if (remote_debug > 0)
|
||
{
|
||
buff[len] = '\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 ("Got packet \"%s\"\n", buff);
|
||
}
|
||
|
||
/* We got the packet. Send an acknowledgement. */
|
||
mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS;
|
||
|
||
ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq);
|
||
ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq);
|
||
ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq);
|
||
ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq);
|
||
|
||
cksum = mips_cksum (ack, (unsigned char *) NULL, 0);
|
||
|
||
ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum);
|
||
ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
|
||
ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
|
||
|
||
if (remote_debug > 0)
|
||
{
|
||
ack[HDR_LENGTH + TRLR_LENGTH] = '\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 ("Writing ack %d \"%s\"\n", mips_receive_seq,
|
||
ack + 1);
|
||
}
|
||
|
||
if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0)
|
||
{
|
||
if (throw_error)
|
||
mips_error ("write to target failed: %s", safe_strerror (errno));
|
||
else
|
||
return -1;
|
||
}
|
||
|
||
return len;
|
||
}
|
||
|
||
/* Optionally send a request to the remote system and optionally wait
|
||
for the reply. This implements the remote debugging protocol,
|
||
which is built on top of the packet protocol defined above. Each
|
||
request has an ADDR argument and a DATA argument. The following
|
||
requests are defined:
|
||
|
||
\0 don't send a request; just wait for a reply
|
||
i read word from instruction space at ADDR
|
||
d read word from data space at ADDR
|
||
I write DATA to instruction space at ADDR
|
||
D write DATA to data space at ADDR
|
||
r read register number ADDR
|
||
R set register number ADDR to value DATA
|
||
c continue execution (if ADDR != 1, set pc to ADDR)
|
||
s single step (if ADDR != 1, set pc to ADDR)
|
||
|
||
The read requests return the value requested. The write requests
|
||
return the previous value in the changed location. The execution
|
||
requests return a UNIX wait value (the approximate signal which
|
||
caused execution to stop is in the upper eight bits).
|
||
|
||
If PERR is not NULL, this function waits for a reply. If an error
|
||
occurs, it sets *PERR to 1 and sets errno according to what the
|
||
target board reports. */
|
||
|
||
static int
|
||
mips_request (cmd, addr, data, perr, timeout, buff)
|
||
int cmd;
|
||
unsigned int addr;
|
||
unsigned int data;
|
||
int *perr;
|
||
int timeout;
|
||
char *buff;
|
||
{
|
||
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)
|
||
fatal ("mips_request: Trying to send command before reply");
|
||
sprintf (buff, "0x0 %c 0x%x 0x%x", cmd, addr, data);
|
||
mips_send_packet (buff, 1);
|
||
mips_need_reply = 1;
|
||
}
|
||
|
||
if (perr == (int *) NULL)
|
||
return 0;
|
||
|
||
if (! mips_need_reply)
|
||
fatal ("mips_request: Trying to get reply before command");
|
||
|
||
mips_need_reply = 0;
|
||
|
||
len = mips_receive_packet (buff, 1, timeout);
|
||
buff[len] = '\0';
|
||
|
||
if (sscanf (buff, "0x%x %c 0x%x 0x%x",
|
||
&rpid, &rcmd, &rerrflg, &rresponse) != 4
|
||
|| (cmd != '\0' && rcmd != cmd))
|
||
mips_error ("Bad response from remote board");
|
||
|
||
if (rerrflg != 0)
|
||
{
|
||
*perr = 1;
|
||
|
||
/* FIXME: This will returns MIPS errno numbers, which may or may
|
||
not be the same as errno values used on other systems. If
|
||
they stick to common errno values, they will be the same, but
|
||
if they don't, they must be translated. */
|
||
errno = rresponse;
|
||
|
||
return 0;
|
||
}
|
||
|
||
*perr = 0;
|
||
return rresponse;
|
||
}
|
||
|
||
static void
|
||
mips_initialize_cleanups (arg)
|
||
PTR arg;
|
||
{
|
||
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_monitor == MON_CAIRO)
|
||
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_monitor == MON_CAIRO)
|
||
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;
|
||
|
||
if (mips_monitor == MON_CAIRO)
|
||
{
|
||
/* The Cairo version of PMON exits immediately, so we do not get
|
||
a reply to this command: */
|
||
mips_request ('x', (unsigned int) 0, (unsigned int) 0, NULL,
|
||
mips_receive_wait, NULL);
|
||
mips_need_reply = 0;
|
||
if (!mips_expect (" break!"))
|
||
return -1;
|
||
}
|
||
else
|
||
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_monitor == MON_CAIRO)
|
||
{
|
||
if (!mips_expect ("\012"))
|
||
return -1;
|
||
}
|
||
else
|
||
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 ()
|
||
{
|
||
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;
|
||
|
||
/* At this point, the packit protocol isn't responding. We'll try getting
|
||
into the monitor, and restarting the protocol. */
|
||
|
||
/* Force the system into the monitor. After this we *should* be at
|
||
the mips_monitor_prompt. */
|
||
if (mips_monitor == MON_PMON || mips_monitor == MON_CAIRO)
|
||
j = 0; /* start by checking if we are already at the prompt */
|
||
else
|
||
j = 1; /* start by sending a break */
|
||
for (; j <= 4; j++)
|
||
{
|
||
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 || mips_monitor == MON_CAIRO)
|
||
{
|
||
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.");
|
||
}
|
||
|
||
if (mips_expect (mips_monitor_prompt))
|
||
break;
|
||
}
|
||
|
||
if (mips_monitor == MON_PMON || mips_monitor == MON_CAIRO)
|
||
{
|
||
/* 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_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, 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
|
||
common_open (ops, name, from_tty)
|
||
struct target_ops *ops;
|
||
char *name;
|
||
int from_tty;
|
||
{
|
||
char *ptype;
|
||
|
||
if (name == 0)
|
||
error (
|
||
"To open a MIPS remote debugging connection, you need to specify what serial\n\
|
||
device is attached to the target board (e.g., /dev/ttya).");
|
||
|
||
target_preopen (from_tty);
|
||
|
||
if (mips_is_open)
|
||
unpush_target (current_ops);
|
||
|
||
mips_desc = SERIAL_OPEN (name);
|
||
if (mips_desc == (serial_t) NULL)
|
||
perror_with_name (name);
|
||
|
||
if (baud_rate != -1)
|
||
{
|
||
if (SERIAL_SETBAUDRATE (mips_desc, baud_rate))
|
||
{
|
||
SERIAL_CLOSE (mips_desc);
|
||
perror_with_name (name);
|
||
}
|
||
}
|
||
|
||
SERIAL_RAW (mips_desc);
|
||
|
||
current_ops = ops;
|
||
mips_is_open = 1;
|
||
|
||
mips_initialize ();
|
||
|
||
if (from_tty)
|
||
printf_unfiltered ("Remote MIPS debugging using %s\n", name);
|
||
|
||
/* Switch to using remote target now. */
|
||
push_target (ops);
|
||
|
||
/* FIXME: Should we call start_remote here? */
|
||
|
||
/* Try to figure out the processor model if possible. */
|
||
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);
|
||
}
|
||
|
||
static void
|
||
cairo_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 = "NEC010>";
|
||
mips_monitor = MON_CAIRO;
|
||
common_open (&cairo_ops, name, from_tty);
|
||
}
|
||
|
||
/* Close a connection to the remote board. */
|
||
|
||
static void
|
||
mips_close (quitting)
|
||
int quitting;
|
||
{
|
||
if (mips_is_open)
|
||
{
|
||
int err;
|
||
|
||
mips_is_open = 0;
|
||
|
||
/* Get the board out of remote debugging mode. */
|
||
(void) mips_exit_debug ();
|
||
|
||
SERIAL_CLOSE (mips_desc);
|
||
}
|
||
}
|
||
|
||
/* Detach from the remote board. */
|
||
|
||
static void
|
||
mips_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
if (args)
|
||
error ("Argument given to \"detach\" when remotely debugging.");
|
||
|
||
pop_target ();
|
||
|
||
mips_close (1);
|
||
|
||
if (from_tty)
|
||
printf_unfiltered ("Ending remote MIPS debugging.\n");
|
||
}
|
||
|
||
/* Tell the target board to resume. This does not wait for a reply
|
||
from the board. */
|
||
|
||
static void
|
||
mips_resume (pid, step, siggnal)
|
||
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) siggnal,
|
||
(int *) NULL,
|
||
mips_receive_wait, NULL);
|
||
}
|
||
|
||
/* Return the signal corresponding to SIG, where SIG is the number which
|
||
the MIPS protocol uses for the signal. */
|
||
enum target_signal
|
||
mips_signal_from_protocol (sig)
|
||
int sig;
|
||
{
|
||
/* We allow a few more signals than the IDT board actually returns, on
|
||
the theory that there is at least *some* hope that perhaps the numbering
|
||
for these signals is widely agreed upon. */
|
||
if (sig <= 0
|
||
|| sig > 31)
|
||
return TARGET_SIGNAL_UNKNOWN;
|
||
|
||
/* Don't want to use target_signal_from_host because we are converting
|
||
from MIPS signal numbers, not host ones. Our internal numbers
|
||
match the MIPS numbers for the signals the board can return, which
|
||
are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */
|
||
return (enum target_signal) sig;
|
||
}
|
||
|
||
/* Wait until the remote stops, and return a wait status. */
|
||
|
||
static int
|
||
mips_wait (pid, status)
|
||
int pid;
|
||
struct target_waitstatus *status;
|
||
{
|
||
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
|
||
indicating that it is stopped. */
|
||
if (! mips_need_reply)
|
||
{
|
||
status->kind = TARGET_WAITKIND_STOPPED;
|
||
status->value.sig = TARGET_SIGNAL_TRAP;
|
||
return 0;
|
||
}
|
||
|
||
/* No timeout; we sit here as long as the program continues to execute. */
|
||
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. */
|
||
if (mips_monitor != MON_CAIRO)
|
||
{
|
||
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. */
|
||
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;
|
||
}
|
||
|
||
/* We have to map between the register numbers used by gdb and the
|
||
register numbers used by the debugging protocol. This function
|
||
assumes that we are using tm-mips.h. */
|
||
|
||
#define REGNO_OFFSET 96
|
||
|
||
static int
|
||
mips_map_regno (regno)
|
||
int regno;
|
||
{
|
||
if (regno < 32)
|
||
return regno;
|
||
if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
|
||
return regno - FP0_REGNUM + 32;
|
||
switch (regno)
|
||
{
|
||
case PC_REGNUM:
|
||
return REGNO_OFFSET + 0;
|
||
case CAUSE_REGNUM:
|
||
return REGNO_OFFSET + 1;
|
||
case HI_REGNUM:
|
||
return REGNO_OFFSET + 2;
|
||
case LO_REGNUM:
|
||
return REGNO_OFFSET + 3;
|
||
case FCRCS_REGNUM:
|
||
return REGNO_OFFSET + 4;
|
||
case FCRIR_REGNUM:
|
||
return REGNO_OFFSET + 5;
|
||
default:
|
||
/* FIXME: Is there a way to get the status register? */
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* Fetch the remote registers. */
|
||
|
||
static void
|
||
mips_fetch_registers (regno)
|
||
int regno;
|
||
{
|
||
unsigned LONGEST val;
|
||
int err;
|
||
|
||
if (regno == -1)
|
||
{
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
mips_fetch_registers (regno);
|
||
return;
|
||
}
|
||
|
||
if (regno == FP_REGNUM || regno == ZERO_REGNUM)
|
||
/* FP_REGNUM on the mips is a hack which is just supposed to read
|
||
zero (see also mips-nat.c). */
|
||
val = 0;
|
||
else
|
||
{
|
||
/* 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_CAIRO)
|
||
val = (unsigned)mips_request ('t', (unsigned int) mips_map_regno (regno),
|
||
(unsigned int) 0, &err, mips_receive_wait, NULL);
|
||
else
|
||
val = (unsigned)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));
|
||
}
|
||
|
||
{
|
||
char buf[MAX_REGISTER_RAW_SIZE];
|
||
|
||
/* We got the number the register holds, but gdb expects to see a
|
||
value in the target byte ordering. */
|
||
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val);
|
||
supply_register (regno, buf);
|
||
}
|
||
}
|
||
|
||
/* Prepare to store registers. The MIPS protocol can store individual
|
||
registers, so this function doesn't have to do anything. */
|
||
|
||
static void
|
||
mips_prepare_to_store ()
|
||
{
|
||
}
|
||
|
||
/* Store remote register(s). */
|
||
|
||
static void
|
||
mips_store_registers (regno)
|
||
int regno;
|
||
{
|
||
int err;
|
||
|
||
if (regno == -1)
|
||
{
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
mips_store_registers (regno);
|
||
return;
|
||
}
|
||
|
||
mips_request ('R', (unsigned int) mips_map_regno (regno),
|
||
(unsigned int) read_register (regno),
|
||
&err, mips_receive_wait, NULL);
|
||
if (err)
|
||
mips_error ("Can't write register %d: %s", regno, safe_strerror (errno));
|
||
}
|
||
|
||
/* Fetch a word from the target board. */
|
||
|
||
static int
|
||
mips_fetch_word (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
int val;
|
||
int err;
|
||
|
||
val = mips_request ('d', (unsigned int) addr, (unsigned int) 0, &err,
|
||
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, NULL);
|
||
if (err)
|
||
mips_error ("Can't read address 0x%x: %s", addr, safe_strerror (errno));
|
||
}
|
||
return val;
|
||
}
|
||
|
||
/* Store a word to the target board. Returns errno code or zero for
|
||
success. If OLD_CONTENTS is non-NULL, put the old contents of that
|
||
memory location there. */
|
||
|
||
static int
|
||
mips_store_word (addr, val, old_contents)
|
||
CORE_ADDR addr;
|
||
int val;
|
||
char *old_contents;
|
||
{
|
||
int err;
|
||
unsigned int oldcontents;
|
||
|
||
oldcontents = mips_request ('D', (unsigned int) addr, (unsigned int) val,
|
||
&err,
|
||
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, NULL);
|
||
if (err)
|
||
return errno;
|
||
}
|
||
if (old_contents != NULL)
|
||
store_unsigned_integer (old_contents, 4, oldcontents);
|
||
return 0;
|
||
}
|
||
|
||
/* 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. Note that protocol gives us the correct value
|
||
for a longword, since it transfers values in ASCII. We want the
|
||
byte values, so we have to swap the longword values. */
|
||
|
||
static int
|
||
mips_xfer_memory (memaddr, myaddr, len, write, ignore)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int write;
|
||
struct target_ops *ignore;
|
||
{
|
||
register int i;
|
||
/* Round starting address down to longword boundary. */
|
||
register CORE_ADDR addr = memaddr &~ 3;
|
||
/* Round ending address up; get number of longwords that makes. */
|
||
register int count = (((memaddr + len) - addr) + 3) / 4;
|
||
/* Allocate buffer of that many longwords. */
|
||
register char *buffer = alloca (count * 4);
|
||
|
||
int status;
|
||
|
||
if (write)
|
||
{
|
||
/* Fill start and end extra bytes of buffer with existing data. */
|
||
if (addr != memaddr || len < 4)
|
||
{
|
||
/* Need part of initial word -- fetch it. */
|
||
store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr));
|
||
}
|
||
|
||
if (count > 1)
|
||
{
|
||
/* Need part of last word -- fetch it. FIXME: we do this even
|
||
if we don't need it. */
|
||
store_unsigned_integer (&buffer[(count - 1) * 4], 4,
|
||
mips_fetch_word (addr + (count - 1) * 4));
|
||
}
|
||
|
||
/* Copy data to be written over corresponding part of buffer */
|
||
|
||
memcpy ((char *) buffer + (memaddr & 3), myaddr, len);
|
||
|
||
/* Write the entire buffer. */
|
||
|
||
for (i = 0; i < count; i++, addr += 4)
|
||
{
|
||
status = mips_store_word (addr,
|
||
extract_unsigned_integer (&buffer[i*4], 4),
|
||
NULL);
|
||
/* Report each kilobyte (we download 32-bit words at a time) */
|
||
if (i % 256 == 255)
|
||
{
|
||
printf_unfiltered ("*");
|
||
fflush (stdout);
|
||
}
|
||
if (status)
|
||
{
|
||
errno = status;
|
||
return 0;
|
||
}
|
||
/* FIXME: Do we want a QUIT here? */
|
||
}
|
||
if (count >= 256)
|
||
printf_unfiltered ("\n");
|
||
}
|
||
else
|
||
{
|
||
/* Read all the longwords */
|
||
for (i = 0; i < count; i++, addr += 4)
|
||
{
|
||
store_unsigned_integer (&buffer[i*4], 4, mips_fetch_word (addr));
|
||
QUIT;
|
||
}
|
||
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
memcpy (myaddr, buffer + (memaddr & 3), len);
|
||
}
|
||
return len;
|
||
}
|
||
|
||
/* Print info on this target. */
|
||
|
||
static void
|
||
mips_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
printf_unfiltered ("Debugging a MIPS board over a serial line.\n");
|
||
}
|
||
|
||
/* Kill the process running on the board. This will actually only
|
||
work if we are doing remote debugging over the console input. I
|
||
think that if IDT/sim had the remote debug interrupt enabled on the
|
||
right port, we could interrupt the process with a break signal. */
|
||
|
||
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)
|
||
{
|
||
char cc;
|
||
|
||
/* Send a ^C. */
|
||
cc = '\003';
|
||
SERIAL_WRITE (mips_desc, &cc, 1);
|
||
sleep (1);
|
||
target_mourn_inferior ();
|
||
}
|
||
#endif
|
||
}
|
||
|
||
/* Start running on the target board. */
|
||
|
||
static void
|
||
mips_create_inferior (execfile, args, env)
|
||
char *execfile;
|
||
char *args;
|
||
char **env;
|
||
{
|
||
CORE_ADDR entry_pt;
|
||
|
||
if (args && *args)
|
||
{
|
||
warning ("\
|
||
Can't pass arguments to remote MIPS board; arguments ignored.");
|
||
/* And don't try to use them on the next "run" command. */
|
||
execute_command ("set args", 0);
|
||
}
|
||
|
||
if (execfile == 0 || exec_bfd == 0)
|
||
error ("No executable file specified");
|
||
|
||
entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd);
|
||
|
||
init_wait_for_inferior ();
|
||
|
||
/* 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 ()
|
||
{
|
||
if (current_ops != NULL)
|
||
unpush_target (current_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
/* We can write a breakpoint and read the shadow contents in one
|
||
operation. */
|
||
|
||
/* The IDT board uses an unusual breakpoint value, and sometimes gets
|
||
confused when it sees the usual MIPS breakpoint instruction. */
|
||
|
||
#define BREAK_INSN (0x00000a0d)
|
||
#define BREAK_INSN_SIZE (4)
|
||
|
||
/* Insert a breakpoint on targets that don't have any better breakpoint
|
||
support. We read the contents of the target location and stash it,
|
||
then overwrite it with a breakpoint instruction. ADDR is the target
|
||
location in the target machine. CONTENTS_CACHE is a pointer to
|
||
memory allocated for saving the target contents. It is guaranteed
|
||
by the caller to be long enough to save sizeof BREAKPOINT bytes (this
|
||
is accomplished via BREAKPOINT_MAX). */
|
||
|
||
static int
|
||
mips_insert_breakpoint (addr, contents_cache)
|
||
CORE_ADDR addr;
|
||
char *contents_cache;
|
||
{
|
||
int status;
|
||
|
||
if (monitor_supports_breakpoints)
|
||
return common_breakpoint ('B', addr, 0x3, "f");
|
||
|
||
return mips_store_word (addr, BREAK_INSN, contents_cache);
|
||
}
|
||
|
||
static int
|
||
mips_remove_breakpoint (addr, 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);
|
||
}
|
||
|
||
#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;
|
||
{
|
||
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)
|
||
{
|
||
/* Cairo returns "0x0 b 0x16 0x0\000", whereas
|
||
Cogent returns "0x0 b 0xffffffff 0x16\000": */
|
||
if (mips_monitor == MON_CAIRO)
|
||
rresponse = rerrflg;
|
||
if (rresponse != 22) /* invalid argument */
|
||
fprintf_unfiltered (stderr, "common_breakpoint (0x%x): Got error: 0x%x\n",
|
||
(unsigned int)addr, rresponse);
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
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, (unsigned int)s->vma,
|
||
(unsigned int)(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 || mips_monitor == MON_CAIRO)
|
||
pmon_load_fast (file);
|
||
else
|
||
mips_load_srec (file);
|
||
|
||
mips_initialize ();
|
||
|
||
/* Finally, make the PC point at the start address */
|
||
if (mips_monitor == MON_CAIRO)
|
||
{
|
||
/* Work around problem where CAIRO monitor does not update the
|
||
PC after a load. The following ensures that the write_pc()
|
||
WILL update the PC value: */
|
||
register_valid[PC_REGNUM] = 0;
|
||
}
|
||
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 ();
|
||
}
|
||
|
||
/* 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 */
|
||
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 */
|
||
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 */
|
||
};
|
||
|
||
/* 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 */
|
||
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 */
|
||
};
|
||
|
||
/* Another alternative target vector. This is a PMON system, but with
|
||
a different monitor prompt, aswell as some other operational
|
||
differences: */
|
||
struct target_ops cairo_ops =
|
||
{
|
||
"cairo", /* 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 */
|
||
cairo_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 */
|
||
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_mips ()
|
||
{
|
||
add_target (&mips_ops);
|
||
add_target (&pmon_ops);
|
||
add_target (&cairo_ops);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("timeout", no_class, var_zinteger,
|
||
(char *) &mips_receive_wait,
|
||
"Set timeout in seconds for remote MIPS serial I/O.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("retransmit-timeout", no_class, var_zinteger,
|
||
(char *) &mips_retransmit_wait,
|
||
"Set retransmit timeout in seconds for remote MIPS serial I/O.\n\
|
||
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);
|
||
}
|