/* Remote debugging interface for MIPS remote debugging protocol.
- Copyright 1993, 1994 Free Software Foundation, Inc.
+ Copyright 1993, 1994, 1995, 2000, 2001 Free Software Foundation, Inc.
Contributed by Cygnus Support. Written by Ian Lance Taylor
<ian@cygnus.com>.
-This file is part of GDB.
+ 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 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.
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 "gdb_string.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <ctype.h>
+
+/* Microsoft C's stat.h doesn't define all the POSIX file modes. */
+#ifndef S_IROTH
+#define S_IROTH S_IREAD
+#endif
-#include <signal.h>
-#include <varargs.h>
\f
+
+/* Breakpoint types. Values 0, 1, and 2 must agree with the watch
+ types passed by breakpoint.c to target_insert_watchpoint.
+ Value 3 is our own invention, and is used for ordinary instruction
+ breakpoints. Value 4 is used to mark an unused watchpoint in tables. */
+enum break_type
+ {
+ BREAK_WRITE, /* 0 */
+ BREAK_READ, /* 1 */
+ BREAK_ACCESS, /* 2 */
+ BREAK_FETCH, /* 3 */
+ BREAK_UNUSED /* 4 */
+ };
+
/* Prototypes for local functions. */
-static int
-mips_readchar PARAMS ((int timeout));
+static int mips_readchar (int timeout);
-static int
-mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage, int ch,
- int timeout));
+static int mips_receive_header (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_receive_trailer (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 int mips_cksum (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_packet (const char *s, int get_ack);
-static int mips_receive_packet PARAMS ((char *buff, int throw_error,
- int timeout));
+static void mips_send_command (const char *cmd, int prompt);
-static int
-mips_request PARAMS ((char cmd, unsigned int addr, unsigned int data,
- int *perr, int timeout));
+static int mips_receive_packet (char *buff, int throw_error, int timeout);
-static void
-mips_initialize PARAMS ((void));
+static ULONGEST mips_request (int cmd, ULONGEST addr, ULONGEST data,
+ int *perr, int timeout, char *buff);
-static void
-mips_open PARAMS ((char *name, int from_tty));
+static void mips_initialize (void);
-static void
-mips_close PARAMS ((int quitting));
+static void mips_open (char *name, int from_tty);
-static void
-mips_detach PARAMS ((char *args, int from_tty));
+static void pmon_open (char *name, int from_tty);
-static void mips_resume PARAMS ((int pid, int step,
- enum target_signal siggnal));
+static void ddb_open (char *name, int from_tty);
-static int
-mips_wait PARAMS ((int pid, struct target_waitstatus *status));
+static void lsi_open (char *name, int from_tty);
-static int
-mips_map_regno PARAMS ((int regno));
+static void mips_close (int quitting);
-static void
-mips_fetch_registers PARAMS ((int regno));
+static void mips_detach (char *args, int from_tty);
-static void
-mips_prepare_to_store PARAMS ((void));
+static void mips_resume (int pid, int step, enum target_signal siggnal);
-static void
-mips_store_registers PARAMS ((int regno));
+static int mips_wait (int pid, struct target_waitstatus *status);
-static int
-mips_fetch_word PARAMS ((CORE_ADDR addr));
+static int mips_map_regno (int regno);
-static int
-mips_store_word PARAMS ((CORE_ADDR addr, int value, char *old_contents));
+static void mips_fetch_registers (int regno);
-static int
-mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
- int write, struct target_ops *ignore));
+static void mips_prepare_to_store (void);
-static void
-mips_files_info PARAMS ((struct target_ops *ignore));
+static void mips_store_registers (int regno);
-static void
-mips_create_inferior PARAMS ((char *execfile, char *args, char **env));
+static unsigned int mips_fetch_word (CORE_ADDR addr);
-static void
-mips_mourn_inferior PARAMS ((void));
+static int mips_store_word (CORE_ADDR addr, unsigned int value,
+ char *old_contents);
+
+static int mips_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
+ int write,
+ struct mem_attrib *attrib,
+ struct target_ops *target);
+
+static void mips_files_info (struct target_ops *ignore);
+
+static void mips_create_inferior (char *execfile, char *args, char **env);
+
+static void mips_mourn_inferior (void);
+
+static int pmon_makeb64 (unsigned long v, char *p, int n, int *chksum);
+
+static int pmon_zeroset (int recsize, char **buff, int *amount,
+ unsigned int *chksum);
-/* A forward declaration. */
+static int pmon_checkset (int recsize, char **buff, int *value);
+
+static void pmon_make_fastrec (char **outbuf, unsigned char *inbuf,
+ int *inptr, int inamount, int *recsize,
+ unsigned int *csum, unsigned int *zerofill);
+
+static int pmon_check_ack (char *mesg);
+
+static void pmon_start_download (void);
+
+static void pmon_end_download (int final, int bintotal);
+
+static void pmon_download (char *buffer, int length);
+
+static void pmon_load_fast (char *file);
+
+static void mips_load (char *file, int from_tty);
+
+static int mips_make_srec (char *buffer, int type, CORE_ADDR memaddr,
+ unsigned char *myaddr, int len);
+
+static int set_breakpoint (CORE_ADDR addr, int len, enum break_type type);
+
+static int clear_breakpoint (CORE_ADDR addr, int len, enum break_type type);
+
+static int common_breakpoint (int set, CORE_ADDR addr, int len,
+ enum break_type type);
+
+/* Forward declarations. */
extern struct target_ops mips_ops;
-\f
+extern struct target_ops pmon_ops;
+extern struct target_ops ddb_ops;
+\f/* *INDENT-OFF* */
/* 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.
+ 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.
+ 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 module 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.
+ 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)
+ 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. */
+/* *INDENT-ON* */
+
/* The SYN character which starts each packet. */
#define SYN '\026'
(((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)
+#define HDR_GET_SEQ(hdr) ((unsigned int)(hdr)[HDR_INDX_SEQ] & 0x3f)
/* The maximum data length. */
#define DATA_MAXLEN 1023
/* The sequence number modulos. */
#define SEQ_MODULOS (64)
+/* PMON commands to load from the serial port or UDP socket. */
+#define LOAD_CMD "load -b -s tty0\r"
+#define LOAD_CMD_UDP "load -b -s udp\r"
+
+/* The target vectors for the four different remote MIPS targets.
+ These are initialized with code in _initialize_remote_mips instead
+ of static initializers, to make it easier to extend the target_ops
+ vector later. */
+struct target_ops mips_ops, pmon_ops, ddb_ops, lsi_ops;
+
+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_DDB, /* 2.7.473 [DDBVR4300,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */
+ MON_LSI, /* 4.3.12 [EB,FP], LSI LOGIC Corp. Tue Feb 25 13:22:14 1997 */
+ /* Last and unused value, for sizing vectors, etc. */
+ MON_LAST
+ };
+static enum mips_monitor_type mips_monitor = MON_LAST;
+
+/* The monitor prompt text. If the user sets the PMON prompt
+ to some new value, the GDB `set monitor-prompt' command must also
+ be used to inform GDB about the expected prompt. Otherwise, GDB
+ will not be able to connect to PMON in mips_initialize().
+ If the `set monitor-prompt' command is not used, the expected
+ default prompt will be set according the target:
+ target prompt
+ ----- -----
+ pmon PMON>
+ ddb NEC010>
+ lsi PMON>
+ */
+static char *mips_monitor_prompt;
+
/* 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;
+/* Set to 1 while the connection is being brought down. */
+static int mips_exiting;
+
/* The next sequence number to send. */
-static int mips_send_seq;
+static unsigned int mips_send_seq;
/* The next sequence number we expect to receive. */
-static int mips_receive_seq;
+static unsigned int mips_receive_seq;
/* The time to wait before retransmitting a packet, in seconds. */
static int mips_retransmit_wait = 3;
/* The number of garbage characters to accept when looking for an
SYN for the next packet. */
-static int mips_syn_garbage = 1050;
+static int mips_syn_garbage = 10;
/* The time to wait for a packet, in seconds. */
static int mips_receive_wait = 5;
/* Handle used to access serial I/O stream. */
static serial_t mips_desc;
+/* UDP handle used to download files to target. */
+static serial_t udp_desc;
+static int udp_in_use;
+
+/* TFTP filename used to download files to DDB board, in the form
+ host:filename. */
+static char *tftp_name; /* host:filename */
+static char *tftp_localname; /* filename portion of above */
+static int tftp_in_use;
+static FILE *tftp_file;
+
+/* 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 int monitor_supports_breakpoints = 0;
+
+/* Data cache header. */
+
+#if 0 /* not used (yet?) */
+static DCACHE *mips_dcache;
+#endif
+
+/* Non-zero means that we've just hit a read or write watchpoint */
+static int hit_watchpoint;
+
+/* Table of breakpoints/watchpoints (used only on LSI PMON target).
+ The table is indexed by a breakpoint number, which is an integer
+ from 0 to 255 returned by the LSI PMON when a breakpoint is set.
+ */
+#define MAX_LSI_BREAKPOINTS 256
+struct lsi_breakpoint_info
+ {
+ enum break_type type; /* type of breakpoint */
+ CORE_ADDR addr; /* address of breakpoint */
+ int len; /* length of region being watched */
+ unsigned long value; /* value to watch */
+ }
+lsi_breakpoints[MAX_LSI_BREAKPOINTS];
+
+/* Error/warning codes returned by LSI PMON for breakpoint commands.
+ Warning values may be ORed together; error values may not. */
+#define W_WARN 0x100 /* This bit is set if the error code is a warning */
+#define W_MSK 0x101 /* warning: Range feature is supported via mask */
+#define W_VAL 0x102 /* warning: Value check is not supported in hardware */
+#define W_QAL 0x104 /* warning: Requested qualifiers are not supported in hardware */
+
+#define E_ERR 0x200 /* This bit is set if the error code is an error */
+#define E_BPT 0x200 /* error: No such breakpoint number */
+#define E_RGE 0x201 /* error: Range is not supported */
+#define E_QAL 0x202 /* error: The requested qualifiers can not be used */
+#define E_OUT 0x203 /* error: Out of hardware resources */
+#define E_NON 0x204 /* error: Hardware breakpoint not supported */
+
+struct lsi_error
+ {
+ int code; /* error code */
+ char *string; /* string associated with this code */
+ };
+
+struct lsi_error lsi_warning_table[] =
+{
+ {W_MSK, "Range feature is supported via mask"},
+ {W_VAL, "Value check is not supported in hardware"},
+ {W_QAL, "Requested qualifiers are not supported in hardware"},
+ {0, NULL}
+};
+
+struct lsi_error lsi_error_table[] =
+{
+ {E_BPT, "No such breakpoint number"},
+ {E_RGE, "Range is not supported"},
+ {E_QAL, "The requested qualifiers can not be used"},
+ {E_OUT, "Out of hardware resources"},
+ {E_NON, "Hardware breakpoint not supported"},
+ {0, NULL}
+};
+
+/* Set to 1 with the 'set monitor-warnings' command to enable printing
+ of warnings returned by PMON when hardware breakpoints are used. */
+static int monitor_warnings;
+
+
+static void
+close_ports (void)
+{
+ mips_is_open = 0;
+ SERIAL_CLOSE (mips_desc);
+
+ if (udp_in_use)
+ {
+ SERIAL_CLOSE (udp_desc);
+ udp_in_use = 0;
+ }
+ tftp_in_use = 0;
+}
+
/* 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 void NORETURN
-mips_error (va_alist)
- va_dcl
+static NORETURN void
+mips_error (char *string,...)
{
va_list args;
- char *string;
- va_start (args);
+ va_start (args, string);
+
target_terminal_ours ();
- wrap_here(""); /* Force out any buffered output */
+ wrap_here (""); /* Force out any buffered output */
gdb_flush (gdb_stdout);
if (error_pre_print)
fprintf_filtered (gdb_stderr, error_pre_print);
- string = va_arg (args, char *);
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);
+ close_ports ();
printf_unfiltered ("Ending remote MIPS debugging.\n");
target_mourn_inferior ();
return_to_top_level (RETURN_ERROR);
}
+/* putc_readable - print a character, displaying non-printable chars in
+ ^x notation or in hex. */
+
+static void
+fputc_readable (int ch, struct ui_file *file)
+{
+ if (ch == '\n')
+ fputc_unfiltered ('\n', file);
+ else if (ch == '\r')
+ fprintf_unfiltered (file, "\\r");
+ else if (ch < 0x20) /* ASCII control character */
+ fprintf_unfiltered (file, "^%c", ch + '@');
+ else if (ch >= 0x7f) /* non-ASCII characters (rubout or greater) */
+ fprintf_unfiltered (file, "[%02x]", ch & 0xff);
+ else
+ fputc_unfiltered (ch, file);
+}
+
+
+/* puts_readable - print a string, displaying non-printable chars in
+ ^x notation or in hex. */
+
+static void
+fputs_readable (const char *string, struct ui_file *file)
+{
+ int c;
+
+ while ((c = *string++) != '\0')
+ fputc_readable (c, file);
+}
+
+
+/* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
+ timed out. TIMEOUT specifies timeout value in seconds.
+ */
+
+int
+mips_expect_timeout (const char *string, int timeout)
+{
+ const char *p = string;
+
+ if (remote_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "Expected \"");
+ fputs_readable (string, gdb_stdlog);
+ fprintf_unfiltered (gdb_stdlog, "\", got \"");
+ }
+
+ immediate_quit++;
+ 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, timeout);
+
+ if (c == SERIAL_TIMEOUT)
+ {
+ if (remote_debug)
+ fprintf_unfiltered (gdb_stdlog, "\": FAIL\n");
+ return 0;
+ }
+
+ if (remote_debug)
+ fputc_readable (c, gdb_stdlog);
+
+ if (c == *p++)
+ {
+ if (*p == '\0')
+ {
+ immediate_quit--;
+ if (remote_debug)
+ fprintf_unfiltered (gdb_stdlog, "\": OK\n");
+ return 1;
+ }
+ }
+ else
+ {
+ p = string;
+ if (c == *p)
+ p++;
+ }
+ }
+}
+
+/* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
+ timed out. The timeout value is hard-coded to 2 seconds. Use
+ mips_expect_timeout if a different timeout value is needed.
+ */
+
+int
+mips_expect (const char *string)
+{
+ return mips_expect_timeout (string, remote_timeout);
+}
+
+/* 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 (char *string, int n)
+{
+ char *p = string;
+ int c;
+
+ immediate_quit++;
+ while (n > 0)
+ {
+ c = SERIAL_READCHAR (mips_desc, remote_timeout);
+
+ if (c == SERIAL_TIMEOUT)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "Failed to read %d characters from target (TIMEOUT)\n", n);
+ immediate_quit--;
+ return 0;
+ }
+
+ *p++ = c;
+ n--;
+ }
+
+ immediate_quit--;
+ return 1;
+}
+
/* Read a character from the remote, aborting on error. Returns
SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR
- returns). FIXME: If we see the string "<IDT>" from the board, then
- we are debugging on the main console port, and we have somehow
- dropped out of remote debugging mode. In this case, we
- automatically go back in to remote debugging mode. This is a hack,
- put in because I can't find any way for a program running on the
- remote board to terminate without also ending remote debugging
+ returns). FIXME: If we see the string mips_monitor_prompt from
+ the board, then we are debugging on the main console port, and we
+ have somehow dropped out of remote debugging mode. In this case,
+ we automatically go back in to remote debugging mode. This is a
+ hack, put in because I can't find any way for a program running on
+ the remote board to terminate without also ending remote debugging
mode. I assume users won't have any trouble with this; for one
thing, the IDT documentation generally assumes that the remote
debugging port is not the console port. This is, however, very
port. */
static int
-mips_readchar (timeout)
- int timeout;
+mips_readchar (int timeout)
{
int ch;
static int state = 0;
- static char nextstate[5] = { '<', 'I', 'D', 'T', '>' };
+ int mips_monitor_prompt_len = strlen (mips_monitor_prompt);
+
+ {
+ int i;
+
+ i = timeout;
+ if (i == -1 && watchdog > 0)
+ i = watchdog;
+ }
- if (state == 5)
+ if (state == mips_monitor_prompt_len)
timeout = 1;
ch = SERIAL_READCHAR (mips_desc, timeout);
+
+ if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */
+ {
+ target_mourn_inferior ();
+ error ("Watchdog has expired. Target detached.\n");
+ }
+
if (ch == SERIAL_EOF)
mips_error ("End of file from remote");
if (ch == SERIAL_ERROR)
mips_error ("Error reading from remote: %s", safe_strerror (errno));
- if (sr_get_debug () > 1)
+ if (remote_debug > 1)
{
/* Don't use _filtered; we can't deal with a QUIT out of
- target_wait, and I think this might be called from there. */
+ 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);
+ fprintf_unfiltered (gdb_stdlog, "Read '%c' %d 0x%x\n", ch, ch, ch);
else
- printf_unfiltered ("Timed out in read\n");
+ fprintf_unfiltered (gdb_stdlog, "Timed out in read\n");
}
- /* If we have seen <IDT> and we either time out, or we see a @
- (which was echoed from a packet we sent), reset the board as
- described above. The first character in a packet after the SYN
- (which is not echoed) is always an @ unless the packet is more
- than 64 characters long, which ours never are. */
+ /* If we have seen mips_monitor_prompt and we either time out, or
+ we see a @ (which was echoed from a packet we sent), reset the
+ board as described above. The first character in a packet after
+ the SYN (which is not echoed) is always an @ unless the packet is
+ more than 64 characters long, which ours never are. */
if ((ch == SERIAL_TIMEOUT || ch == '@')
- && state == 5
- && ! mips_initializing)
+ && state == mips_monitor_prompt_len
+ && !mips_initializing
+ && !mips_exiting)
{
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- printf_unfiltered ("Reinitializing MIPS debugging mode\n");
- SERIAL_WRITE (mips_desc, "\015db tty0\015", sizeof "\015db tty0\015" - 1);
- sleep (1);
+ fprintf_unfiltered (gdb_stdlog, "Reinitializing MIPS debugging mode\n");
mips_need_reply = 0;
mips_initialize ();
state = 0;
- mips_error ("Remote board reset");
+ /* At this point, about the only thing we can do is abort the command
+ in progress and get back to command level as quickly as possible. */
+
+ error ("Remote board reset, debug protocol re-initialized.");
}
- if (ch == nextstate[state])
+ if (ch == mips_monitor_prompt[state])
++state;
else
state = 0;
or -1 for timeout. */
static int
-mips_receive_header (hdr, pgarbage, ch, timeout)
- unsigned char *hdr;
- int *pgarbage;
- int ch;
- int timeout;
+mips_receive_header (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. */
+ 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 != SYN)
{
/* Printing the character here lets the user of gdb see
- what the program is outputting, if the debugging is
- being done on the console port. Don't use _filtered;
- we can't deal with a QUIT out of target_wait. */
- if (! mips_initializing || sr_get_debug () > 0)
- {
- if (ch < 0x20 && ch != '\n')
+ 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 and
+ buffered target output confuses the user. */
+ if (!mips_initializing || remote_debug > 0)
+ {
+ if (isprint (ch) || isspace (ch))
{
- putchar_unfiltered ('^');
- putchar_unfiltered (ch + 0x40);
+ fputc_unfiltered (ch, gdb_stdtarg);
}
else
- putchar_unfiltered (ch);
- gdb_flush (gdb_stdout);
- }
-
- ++*pgarbage;
- if (*pgarbage > mips_syn_garbage)
- mips_error ("Remote debugging protocol failure");
+ {
+ fputc_readable (ch, gdb_stdtarg);
+ }
+ gdb_flush (gdb_stdtarg);
+ }
+
+ /* Only count unprintable characters. */
+ if (! (isprint (ch) || isspace (ch)))
+ (*pgarbage) += 1;
+
+ if (mips_syn_garbage > 0
+ && *pgarbage > mips_syn_garbage)
+ mips_error ("Debug protocol failure: more than %d characters before a sync.",
+ mips_syn_garbage);
}
}
ch = mips_readchar (timeout);
if (ch == SERIAL_TIMEOUT)
return -1;
-
/* Make sure this is a header byte. */
- if (ch == SYN || ! HDR_CHECK (ch))
+ 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. */
+ loop around and keep looking for SYN. */
if (i >= HDR_LENGTH)
return 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;
+mips_receive_trailer (unsigned char *trlr, int *pgarbage, int *pch, int timeout)
{
int i;
int ch;
*pch = ch;
if (ch == SERIAL_TIMEOUT)
return -1;
- if (! TRLR_CHECK (ch))
+ if (!TRLR_CHECK (ch))
return -2;
trlr[i] = ch;
}
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;
+mips_cksum (const unsigned char *hdr, const unsigned char *data, int len)
{
register const unsigned char *p;
register int c;
p = hdr + 1;
while (c-- != 0)
cksum += *p++;
-
+
c = len;
p = data;
while (c-- != 0)
/* Send a packet containing the given ASCII string. */
static void
-mips_send_packet (s, get_ack)
- const char *s;
- int get_ack;
+mips_send_packet (const char *s, int get_ack)
{
- unsigned int len;
+ /* unsigned */ int len;
unsigned char *packet;
register int cksum;
int try;
the sequence number we expect in the acknowledgement. */
mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS;
- if (! get_ack)
- return;
-
/* We can only have one outstanding data packet, so we just wait for
the acknowledgement here. Keep retransmitting the packet until
we get one, or until we've tried too many times. */
int garbage;
int ch;
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0';
- printf_unfiltered ("Writing \"%s\"\n", packet + 1);
+ fprintf_unfiltered (gdb_stdlog, "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;
+ unsigned int seq;
/* Get the packet header. If we time out, resend the data
packet. */
data packet may be the packet the remote sends after the
acknowledgement. */
if (HDR_IS_DATA (hdr))
- continue;
+ {
+ 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 (remote_timeout);
+ if (rch == SYN)
+ {
+ ch = SYN;
+ break;
+ }
+ if (rch == SERIAL_TIMEOUT)
+ break;
+ /* ignore the character */
+ }
+
+ if (i == len)
+ (void) mips_receive_trailer (trlr, &garbage, &ch,
+ remote_timeout);
+
+ /* We don't bother checking the checksum, or providing an
+ ACK to the packet. */
+ continue;
+ }
/* If the length is not 0, this is a garbled packet. */
if (HDR_GET_LEN (hdr) != 0)
!= TRLR_GET_CKSUM (trlr))
continue;
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
hdr[HDR_LENGTH] = '\0';
trlr[TRLR_LENGTH] = '\0';
/* 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);
+ target_wait, and I think this might be called from there. */
+ fprintf_unfiltered (gdb_stdlog, "Got ack %d \"%s%s\"\n",
+ HDR_GET_SEQ (hdr), hdr + 1, trlr);
}
/* If this ack is for the current packet, we're done. */
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;
+mips_receive_packet (char *buff, int throw_error, int timeout)
{
int ch;
int garbage;
ch = 0;
/* An acknowledgement is probably a duplicate; ignore it. */
- if (! HDR_IS_DATA (hdr))
- {
- /* Don't use _filtered; we can't deal with a QUIT out of
- target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
- printf_unfiltered ("Ignoring unexpected ACK\n");
- continue;
- }
-
- /* If this is the wrong sequence number, ignore it. */
- if (HDR_GET_SEQ (hdr) != mips_receive_seq)
+ if (!HDR_IS_DATA (hdr))
{
+ len = HDR_GET_LEN (hdr);
+ /* Check if the length is valid for an ACK, we may aswell
+ try and read the remainder of the packet: */
+ if (len == 0)
+ {
+ /* Ignore the error condition, since we are going to
+ ignore the packet anyway. */
+ (void) mips_receive_trailer (trlr, &garbage, &ch, timeout);
+ }
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
- printf_unfiltered ("Ignoring sequence number %d (want %d)\n",
- HDR_GET_SEQ (hdr), mips_receive_seq);
+ if (remote_debug > 0)
+ fprintf_unfiltered (gdb_stdlog, "Ignoring unexpected ACK\n");
continue;
}
len = HDR_GET_LEN (hdr);
-
for (i = 0; i < len; i++)
{
int rch;
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
- printf_unfiltered ("Got new SYN after %d chars (wanted %d)\n",
- i, len);
+ if (remote_debug > 0)
+ fprintf_unfiltered (gdb_stdlog,
+ "Got new SYN after %d chars (wanted %d)\n",
+ i, len);
continue;
}
{
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
- if (sr_get_debug () > 0)
- printf_unfiltered ("Got SYN when wanted trailer\n");
+ if (remote_debug > 0)
+ fprintf_unfiltered (gdb_stdlog, "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)
+ fprintf_unfiltered (gdb_stdlog,
+ "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 (sr_get_debug () > 0)
+ if (remote_debug > 0)
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
printf_unfiltered ("Bad checksum; data %d, trailer %d\n",
- mips_cksum (hdr, buff, len),
- TRLR_GET_CKSUM (trlr));
+ 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. */
+ 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_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
ack[HDR_LENGTH + TRLR_LENGTH] = '\0';
/* Don't use _filtered; we can't deal with a QUIT out of
target_wait, and I think this might be called from there. */
printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq,
- ack + 1);
+ ack + 1);
}
if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0)
}
}
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
buff[len] = '\0';
/* Don't use _filtered; we can't deal with a QUIT out of
- target_wait, and I think this might be called from there. */
+ target_wait, and I think this might be called from there. */
printf_unfiltered ("Got packet \"%s\"\n", buff);
}
ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
- if (sr_get_debug () > 0)
+ if (remote_debug > 0)
{
ack[HDR_LENGTH + TRLR_LENGTH] = '\0';
/* Don't use _filtered; we can't deal with a QUIT out of
- target_wait, and I think this might be called from there. */
+ target_wait, and I think this might be called from there. */
printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq,
- ack + 1);
+ ack + 1);
}
if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0)
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)
+ \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
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)
- char cmd;
- unsigned int addr;
- unsigned int data;
- int *perr;
- int timeout;
-{
- char buff[DATA_MAXLEN + 1];
+static ULONGEST
+mips_request (int cmd,
+ ULONGEST addr,
+ ULONGEST data,
+ int *perr,
+ int timeout,
+ char *buff)
+{
+ char myBuff[DATA_MAXLEN + 1];
int len;
int rpid;
char rcmd;
int rerrflg;
- int rresponse;
-
+ unsigned long 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);
+ internal_error (__FILE__, __LINE__,
+ "mips_request: Trying to send command before reply");
+ sprintf (buff, "0x0 %c 0x%s 0x%s", cmd, paddr_nz (addr), paddr_nz (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");
+ if (!mips_need_reply)
+ internal_error (__FILE__, __LINE__,
+ "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",
+ if (sscanf (buff, "0x%x %c 0x%x 0x%lx",
&rpid, &rcmd, &rerrflg, &rresponse) != 4
|| (cmd != '\0' && rcmd != cmd))
mips_error ("Bad response from remote board");
*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. */
+ 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;
}
static void
-mips_initialize_cleanups (arg)
- PTR arg;
+mips_initialize_cleanups (PTR arg)
{
mips_initializing = 0;
}
+static void
+mips_exit_cleanups (PTR arg)
+{
+ mips_exiting = 0;
+}
+
+static void
+mips_send_command (const char *cmd, int prompt)
+{
+ SERIAL_WRITE (mips_desc, cmd, strlen (cmd));
+ mips_expect (cmd);
+ mips_expect ("\n");
+ if (prompt)
+ mips_expect (mips_monitor_prompt);
+}
+
+/* Enter remote (dbx) debug mode: */
+static void
+mips_enter_debug (void)
+{
+ /* Reset the sequence numbers, ready for the new debug sequence: */
+ mips_send_seq = 0;
+ mips_receive_seq = 0;
+
+ if (mips_monitor != MON_IDT)
+ mips_send_command ("debug\r", 0);
+ else /* assume IDT monitor by default */
+ mips_send_command ("db tty0\r", 0);
+
+ sleep (1);
+ SERIAL_WRITE (mips_desc, "\r", sizeof "\r" - 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_IDT)
+ mips_expect ("\r");
+
+ {
+ 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 (void)
+{
+ int err;
+ struct cleanup *old_cleanups = make_cleanup (mips_exit_cleanups, NULL);
+
+ mips_exiting = 1;
+
+ if (mips_monitor != MON_IDT)
+ {
+ /* The DDB (NEC) and MiniRISC (LSI) versions of PMON exit immediately,
+ so we do not get a reply to this command: */
+ mips_request ('x', 0, 0, NULL, mips_receive_wait, NULL);
+ mips_need_reply = 0;
+ if (!mips_expect (" break!"))
+ return -1;
+ }
+ else
+ mips_request ('x', 0, 0, &err, mips_receive_wait, NULL);
+
+ if (!mips_expect (mips_monitor_prompt))
+ return -1;
+
+ do_cleanups (old_cleanups);
+
+ return 0;
+}
+
/* Initialize a new connection to the MIPS board, and make sure we are
really connected. */
static void
-mips_initialize ()
+mips_initialize (void)
{
- char cr;
- char buff[DATA_MAXLEN + 1];
int err;
struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL);
+ int j;
/* What is this code doing here? I don't see any way it can happen, and
it might mean mips_initializing didn't get cleared properly.
So I'll make it a warning. */
+
if (mips_initializing)
{
warning ("internal error: mips_initialize called twice");
return;
}
+ mips_wait_flag = 0;
mips_initializing = 1;
- mips_send_seq = 0;
- mips_receive_seq = 0;
-
- /* The board seems to want to send us a packet. I don't know what
- it means. The packet seems to be triggered by a carriage return
- character, although perhaps any character would do. */
- cr = '\015';
- /* FIXME check the result from this */
- SERIAL_WRITE (mips_desc, &cr, 1);
+ /* At this point, the packit protocol isn't responding. We'll try getting
+ into the monitor, and restarting the protocol. */
- if (mips_receive_packet (buff, 0, 3) < 0)
+ /* Force the system into the monitor. After this we *should* be at
+ the mips_monitor_prompt. */
+ if (mips_monitor != MON_IDT)
+ j = 0; /* start by checking if we are already at the prompt */
+ else
+ j = 1; /* start by sending a break */
+ for (; j <= 4; j++)
{
- char cc;
+ switch (j)
+ {
+ case 0: /* First, try sending a CR */
+ SERIAL_FLUSH_INPUT (mips_desc);
+ SERIAL_WRITE (mips_desc, "\r", 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_IDT)
+ {
+ 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, "\r/E/E\r");
+ SERIAL_WRITE (mips_desc, tbuff, 6);
+ }
+ else
+ {
+ char srec[10];
+ int i;
+
+ /* We are possibly in binary download mode, having
+ aborted in the middle of an S-record. ^C won't
+ work because of binary mode. The only reliable way
+ out is to send enough termination packets (8 bytes)
+ to fill up and then overflow the largest size
+ S-record (255 bytes in this case). This amounts to
+ 256/8 + 1 packets.
+ */
+
+ mips_make_srec (srec, '7', 0, NULL, 0);
+
+ for (i = 1; i <= 33; i++)
+ {
+ SERIAL_WRITE (mips_desc, srec, 8);
+
+ if (SERIAL_READCHAR (mips_desc, 0) >= 0)
+ break; /* Break immediatly if we get something from
+ the board. */
+ }
+ }
+ }
+ break;
+ case 4:
+ mips_error ("Failed to initialize.");
+ }
- /* We did not receive the packet we expected; try resetting the
- board and trying again. */
- printf_filtered ("Failed to initialize; trying to reset board\n");
- cc = '\003';
- SERIAL_WRITE (mips_desc, &cc, 1);
- sleep (2);
- SERIAL_WRITE (mips_desc, "\015db tty0\015", sizeof "\015db tty0\015" - 1);
- sleep (1);
- cr = '\015';
- SERIAL_WRITE (mips_desc, &cr, 1);
+ if (mips_expect (mips_monitor_prompt))
+ break;
+ }
+
+ if (mips_monitor != MON_IDT)
+ {
+ /* Sometimes PMON ignores the first few characters in the first
+ command sent after a load. Sending a blank command gets
+ around that. */
+ mips_send_command ("\r", -1);
+
+ /* Ensure the correct target state: */
+ if (mips_monitor != MON_LSI)
+ mips_send_command ("set regsize 64\r", -1);
+ mips_send_command ("set hostport tty0\r", -1);
+ mips_send_command ("set brkcmd \"\"\r", -1);
+ /* Delete all the current breakpoints: */
+ mips_send_command ("db *\r", -1);
+ /* NOTE: PMON does not have breakpoint support through the
+ "debug" mode, only at the monitor command-line. */
}
- mips_receive_packet (buff, 1, 3);
+
+ mips_enter_debug ();
+
+ /* Clear all breakpoints: */
+ if ((mips_monitor == MON_IDT
+ && clear_breakpoint (-1, 0, BREAK_UNUSED) == 0)
+ || mips_monitor == MON_LSI)
+ monitor_supports_breakpoints = 1;
+ else
+ monitor_supports_breakpoints = 0;
do_cleanups (old_cleanups);
/* If this doesn't call error, we have connected; we don't care if
the request itself succeeds or fails. */
- mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err,
- mips_receive_wait);
+
+ mips_request ('r', 0, 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
-mips_open (name, from_tty)
- char *name;
- int from_tty;
+common_open (struct target_ops *ops, char *name, int from_tty,
+ enum mips_monitor_type new_monitor,
+ const char *new_monitor_prompt)
{
+ char *ptype;
+ char *serial_port_name;
+ char *remote_name = 0;
+ char *local_name = 0;
+ char **argv;
+
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).");
-
+ "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).\n"
+ "If you want to use TFTP to download to the board, specify the name of a\n"
+ "temporary file to be used by GDB for downloads as the second argument.\n"
+ "This filename must be in the form host:filename, where host is the name\n"
+ "of the host running the TFTP server, and the file must be readable by the\n"
+ "world. If the local name of the temporary file differs from the name as\n"
+ "seen from the board via TFTP, specify that name as the third parameter.\n");
+
+ /* Parse the serial port name, the optional TFTP name, and the
+ optional local TFTP name. */
+ if ((argv = buildargv (name)) == NULL)
+ nomem (0);
+ make_cleanup_freeargv (argv);
+
+ serial_port_name = xstrdup (argv[0]);
+ if (argv[1]) /* remote TFTP name specified? */
+ {
+ remote_name = argv[1];
+ if (argv[2]) /* local TFTP filename specified? */
+ local_name = argv[2];
+ }
+
target_preopen (from_tty);
if (mips_is_open)
- unpush_target (&mips_ops);
+ unpush_target (current_ops);
- mips_desc = SERIAL_OPEN (name);
+ /* Open and initialize the serial port. */
+ mips_desc = SERIAL_OPEN (serial_port_name);
if (mips_desc == (serial_t) NULL)
- perror_with_name (name);
+ perror_with_name (serial_port_name);
if (baud_rate != -1)
{
if (SERIAL_SETBAUDRATE (mips_desc, baud_rate))
- {
- SERIAL_CLOSE (mips_desc);
- perror_with_name (name);
- }
+ {
+ SERIAL_CLOSE (mips_desc);
+ perror_with_name (serial_port_name);
+ }
}
SERIAL_RAW (mips_desc);
+ /* Open and initialize the optional download port. If it is in the form
+ hostname#portnumber, it's a UDP socket. If it is in the form
+ hostname:filename, assume it's the TFTP filename that must be
+ passed to the DDB board to tell it where to get the load file. */
+ if (remote_name)
+ {
+ if (strchr (remote_name, '#'))
+ {
+ udp_desc = SERIAL_OPEN (remote_name);
+ if (!udp_desc)
+ perror_with_name ("Unable to open UDP port");
+ udp_in_use = 1;
+ }
+ else
+ {
+ /* Save the remote and local names of the TFTP temp file. If
+ the user didn't specify a local name, assume it's the same
+ as the part of the remote name after the "host:". */
+ if (tftp_name)
+ xfree (tftp_name);
+ if (tftp_localname)
+ xfree (tftp_localname);
+ if (local_name == NULL)
+ if ((local_name = strchr (remote_name, ':')) != NULL)
+ local_name++; /* skip over the colon */
+ if (local_name == NULL)
+ local_name = remote_name; /* local name same as remote name */
+ tftp_name = xstrdup (remote_name);
+ tftp_localname = xstrdup (local_name);
+ tftp_in_use = 1;
+ }
+ }
+
+ current_ops = ops;
mips_is_open = 1;
+ /* Reset the expected monitor prompt if it's never been set before. */
+ if (mips_monitor_prompt == NULL)
+ mips_monitor_prompt = xstrdup (new_monitor_prompt);
+ mips_monitor = new_monitor;
+
mips_initialize ();
if (from_tty)
- printf_unfiltered ("Remote MIPS debugging using %s\n", name);
- push_target (&mips_ops); /* Switch to using remote target now */
+ printf_unfiltered ("Remote MIPS debugging using %s\n", serial_port_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 (xstrdup (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);
+ xfree (serial_port_name);
+}
+
+static void
+mips_open (char *name, int from_tty)
+{
+ const char *monitor_prompt = NULL;
+ if (TARGET_ARCHITECTURE != NULL
+ && TARGET_ARCHITECTURE->arch == bfd_arch_mips)
+ {
+ switch (TARGET_ARCHITECTURE->mach)
+ {
+ case bfd_mach_mips4100:
+ case bfd_mach_mips4300:
+ case bfd_mach_mips4600:
+ case bfd_mach_mips4650:
+ case bfd_mach_mips5000:
+ monitor_prompt = "<RISQ> ";
+ break;
+ }
+ }
+ if (monitor_prompt == NULL)
+ monitor_prompt = "<IDT>";
+ common_open (&mips_ops, name, from_tty, MON_IDT, monitor_prompt);
+}
+
+static void
+pmon_open (char *name, int from_tty)
+{
+ common_open (&pmon_ops, name, from_tty, MON_PMON, "PMON> ");
+}
+
+static void
+ddb_open (char *name, int from_tty)
+{
+ common_open (&ddb_ops, name, from_tty, MON_DDB, "NEC010>");
+}
+
+static void
+lsi_open (char *name, int from_tty)
+{
+ int i;
+
+ /* Clear the LSI breakpoint table. */
+ for (i = 0; i < MAX_LSI_BREAKPOINTS; i++)
+ lsi_breakpoints[i].type = BREAK_UNUSED;
+
+ common_open (&lsi_ops, name, from_tty, MON_LSI, "PMON> ");
}
/* Close a connection to the remote board. */
static void
-mips_close (quitting)
- int quitting;
+mips_close (int quitting)
{
if (mips_is_open)
{
- int err;
-
- mips_is_open = 0;
-
/* Get the board out of remote debugging mode. */
- mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err,
- mips_receive_wait);
+ (void) mips_exit_debug ();
- SERIAL_CLOSE (mips_desc);
+ close_ports ();
}
}
/* Detach from the remote board. */
static void
-mips_detach (args, from_tty)
- char *args;
- int from_tty;
+mips_detach (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. */
+ from the board, except in the case of single-stepping on LSI boards,
+ where PMON does return a reply. */
static void
-mips_resume (pid, step, siggnal)
- int pid, step;
- enum target_signal siggnal;
+mips_resume (int pid, int step, enum target_signal siggnal)
{
- if (siggnal != TARGET_SIGNAL_0)
- warning
- ("Can't send signals to a remote system. Try `handle %s ignore'.",
- target_signal_to_name (siggnal));
+ int err;
- mips_request (step ? 's' : 'c',
- (unsigned int) 1,
- (unsigned int) 0,
- (int *) NULL,
- mips_receive_wait);
+ /* LSI PMON requires returns a reply packet "0x1 s 0x0 0x57f" after
+ a single step, so we wait for that. */
+ mips_request (step ? 's' : 'c', 1, siggnal,
+ mips_monitor == MON_LSI && step ? &err : (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;
+mips_signal_from_protocol (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
/* Wait until the remote stops, and return a wait status. */
static int
-mips_wait (pid, status)
- int pid;
- struct target_waitstatus *status;
+mips_wait (int pid, struct target_waitstatus *status)
{
int rstatus;
int err;
+ char buff[DATA_MAXLEN];
+ int rpc, rfp, rsp;
+ char flags[20];
+ int nfields;
+ int i;
+
+ 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)
+ if (!mips_need_reply)
{
status->kind = TARGET_WAITKIND_STOPPED;
status->value.sig = TARGET_SIGNAL_TRAP;
}
/* No timeout; we sit here as long as the program continues to execute. */
- rstatus = mips_request ('\0', (unsigned int) 0, (unsigned int) 0, &err, -1);
+ mips_wait_flag = 1;
+ rstatus = mips_request ('\000', 0, 0, &err, -1, buff);
+ mips_wait_flag = 0;
if (err)
mips_error ("Remote failure: %s", safe_strerror (errno));
+ /* 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_PMON)
+ {
+ mips_exit_debug ();
+ mips_enter_debug ();
+ }
+
+ /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */
+
+ nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s",
+ &rpc, &rfp, &rsp, flags);
+ if (nfields >= 3)
+ {
+ 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;
+ }
+ }
+
+ if (strcmp (target_shortname, "lsi") == 0)
+ {
+#if 0
+ /* If this is an LSI PMON target, see if we just hit a hardrdware watchpoint.
+ Right now, PMON doesn't give us enough information to determine which
+ breakpoint we hit. So we have to look up the PC in our own table
+ of breakpoints, and if found, assume it's just a normal instruction
+ fetch breakpoint, not a data watchpoint. FIXME when PMON
+ provides some way to tell us what type of breakpoint it is. */
+ int i;
+ CORE_ADDR pc = read_pc ();
+
+ hit_watchpoint = 1;
+ for (i = 0; i < MAX_LSI_BREAKPOINTS; i++)
+ {
+ if (lsi_breakpoints[i].addr == pc
+ && lsi_breakpoints[i].type == BREAK_FETCH)
+ {
+ hit_watchpoint = 0;
+ break;
+ }
+ }
+#else
+ /* If a data breakpoint was hit, PMON returns the following packet:
+ 0x1 c 0x0 0x57f 0x1
+ The return packet from an ordinary breakpoint doesn't have the
+ extra 0x01 field tacked onto the end. */
+ if (nfields == 1 && rpc == 1)
+ hit_watchpoint = 1;
+#endif
+ }
+
+ /* 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 */
+
/* 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)
+ if ((rstatus & 0xff) == 0)
{
status->kind = TARGET_WAITKIND_EXITED;
- status->value.integer = (((rstatus) >> 8) & 0377);
+ status->value.integer = (((rstatus) >> 8) & 0xff);
}
- else if ((rstatus & 0377) == 0177)
+ else if ((rstatus & 0xff) == 0x7f)
{
status->kind = TARGET_WAITKIND_STOPPED;
- status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377);
+ status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0xff);
+
+ /* If the stop PC is in the _exit function, assume
+ we hit the 'break 0x3ff' instruction in _exit, so this
+ is not a normal breakpoint. */
+ if (strcmp (target_shortname, "lsi") == 0)
+ {
+ char *func_name;
+ CORE_ADDR func_start;
+ CORE_ADDR pc = read_pc ();
+
+ find_pc_partial_function (pc, &func_name, &func_start, NULL);
+ if (func_name != NULL && strcmp (func_name, "_exit") == 0
+ && func_start == pc)
+ status->kind = TARGET_WAITKIND_EXITED;
+ }
}
else
{
status->kind = TARGET_WAITKIND_SIGNALLED;
- status->value.sig = mips_signal_from_protocol (rstatus & 0177);
+ status->value.sig = mips_signal_from_protocol (rstatus & 0x7f);
}
return 0;
#define REGNO_OFFSET 96
static int
-mips_map_regno (regno)
- int regno;
+mips_map_regno (int regno)
{
if (regno < 32)
return regno;
/* Fetch the remote registers. */
static void
-mips_fetch_registers (regno)
- int regno;
+mips_fetch_registers (int regno)
{
unsigned LONGEST val;
int err;
val = 0;
else
{
- val = mips_request ('r', (unsigned int) mips_map_regno (regno),
- (unsigned int) 0, &err, mips_receive_wait);
- if (err)
- mips_error ("Can't read register %d: %s", regno,
- safe_strerror (errno));
+ /* If PMON doesn't support this register, don't waste serial
+ bandwidth trying to read it. */
+ int pmon_reg = mips_map_regno (regno);
+ if (regno != 0 && pmon_reg == 0)
+ 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_DDB)
+ val = (unsigned) mips_request ('t', pmon_reg, 0,
+ &err, mips_receive_wait, NULL);
+ else
+ val = mips_request ('r', pmon_reg, 0,
+ &err, mips_receive_wait, NULL);
+ if (err)
+ mips_error ("Can't read register %d: %s", regno,
+ safe_strerror (errno));
+ }
}
{
registers, so this function doesn't have to do anything. */
static void
-mips_prepare_to_store ()
+mips_prepare_to_store (void)
{
}
/* Store remote register(s). */
static void
-mips_store_registers (regno)
- int regno;
+mips_store_registers (int regno)
{
int err;
return;
}
- mips_request ('R', (unsigned int) mips_map_regno (regno),
- (unsigned int) read_register (regno),
- &err, mips_receive_wait);
+ mips_request ('R', mips_map_regno (regno),
+ 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;
+static unsigned int
+mips_fetch_word (CORE_ADDR addr)
{
- int val;
+ unsigned int val;
int err;
- val = mips_request ('d', (unsigned int) addr, (unsigned int) 0, &err,
- mips_receive_wait);
+ val = mips_request ('d', addr, 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);
+ val = mips_request ('i', addr, 0, &err,
+ mips_receive_wait, NULL);
if (err)
- mips_error ("Can't read address 0x%x: %s", addr, safe_strerror (errno));
+ mips_error ("Can't read address 0x%s: %s",
+ paddr_nz (addr), safe_strerror (errno));
}
return val;
}
success. If OLD_CONTENTS is non-NULL, put the old contents of that
memory location there. */
+/* FIXME! make sure only 32-bit quantities get stored! */
static int
-mips_store_word (addr, val, old_contents)
- CORE_ADDR addr;
- int val;
- char *old_contents;
+mips_store_word (CORE_ADDR addr, unsigned int val, char *old_contents)
{
int err;
unsigned int oldcontents;
- oldcontents = mips_request ('D', (unsigned int) addr, (unsigned int) val,
- &err,
- mips_receive_wait);
+ oldcontents = mips_request ('D', addr, 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);
+ oldcontents = mips_request ('I', addr, val, &err,
+ mips_receive_wait, NULL);
if (err)
return errno;
}
for a longword, since it transfers values in ASCII. We want the
byte values, so we have to swap the longword values. */
+static int mask_address_p = 1;
+
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;
+mips_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
+ struct mem_attrib *attrib ATTRIBUTE_UNUSED,
+ struct target_ops *target ATTRIBUTE_UNUSED)
+{
+ int i;
+ CORE_ADDR addr;
+ int count;
+ char *buffer;
+ int status;
+
+ /* PMON targets do not cope well with 64 bit addresses. Mask the
+ value down to 32 bits. */
+ if (mask_address_p)
+ memaddr &= (CORE_ADDR) 0xffffffff;
+
/* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr &~ 3;
+ addr = memaddr & ~3;
/* Round ending address up; get number of longwords that makes. */
- register int count = (((memaddr + len) - addr) + 3) / 4;
+ count = (((memaddr + len) - addr) + 3) / 4;
/* Allocate buffer of that many longwords. */
- register char *buffer = alloca (count * 4);
-
- int status;
+ buffer = alloca (count * 4);
if (write)
{
for (i = 0; i < count; i++, addr += 4)
{
status = mips_store_word (addr,
- extract_unsigned_integer (&buffer[i*4], 4),
+ extract_unsigned_integer (&buffer[i * 4], 4),
NULL);
/* Report each kilobyte (we download 32-bit words at a time) */
- if (i % 256 == 255)
+ if (i % 256 == 255)
{
printf_unfiltered ("*");
- fflush (stdout);
+ gdb_flush (gdb_stdout);
}
if (status)
{
/* Read all the longwords */
for (i = 0; i < count; i++, addr += 4)
{
- store_unsigned_integer (&buffer[i*4], 4, mips_fetch_word (addr));
+ store_unsigned_integer (&buffer[i * 4], 4, mips_fetch_word (addr));
QUIT;
}
/* Print info on this target. */
static void
-mips_files_info (ignore)
- struct target_ops *ignore;
+mips_files_info (struct target_ops *ignore)
{
printf_unfiltered ("Debugging a MIPS board over a serial line.\n");
}
right port, we could interrupt the process with a break signal. */
static void
-mips_kill ()
+mips_kill (void)
{
+ 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;
+ close_ports ();
+
+ 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)
{
/* Start running on the target board. */
static void
-mips_create_inferior (execfile, args, env)
- char *execfile;
- char *args;
- char **env;
+mips_create_inferior (char *execfile, char *args, char **env)
{
CORE_ADDR entry_pt;
/* Clean up after a process. Actually nothing to do. */
static void
-mips_mourn_inferior ()
+mips_mourn_inferior (void)
{
- unpush_target (&mips_ops);
+ if (current_ops != NULL)
+ unpush_target (current_ops);
generic_mourn_inferior ();
}
\f
/* 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. */
-
-#if TARGET_BYTE_ORDER == BIG_ENDIAN
-static unsigned char break_insn[] = {0, 0, 0x0a, 0x0d};
-#else
-static unsigned char break_insn[] = {0x0d, 0x0a, 0, 0};
-#endif
-
-/* Insert a breakpoint on targets that don't have any better breakpoint
- support. We read the contents of the target location and stash it,
+/* Insert a breakpoint. On targets that don't have built-in 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
is accomplished via BREAKPOINT_MAX). */
static int
-mips_insert_breakpoint (addr, contents_cache)
- CORE_ADDR addr;
- char *contents_cache;
+mips_insert_breakpoint (CORE_ADDR addr, char *contents_cache)
+{
+ if (monitor_supports_breakpoints)
+ return set_breakpoint (addr, MIPS_INSTLEN, BREAK_FETCH);
+ else
+ return memory_insert_breakpoint (addr, contents_cache);
+}
+
+static int
+mips_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
+{
+ if (monitor_supports_breakpoints)
+ return clear_breakpoint (addr, MIPS_INSTLEN, BREAK_FETCH);
+ else
+ return memory_remove_breakpoint (addr, contents_cache);
+}
+
+#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 (CORE_ADDR addr, char *contents_cache)
{
int status;
- return
- mips_store_word (addr,
- extract_unsigned_integer (break_insn, sizeof break_insn),
- contents_cache);
+ 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\r", addr);
+ mips_send_command (tbuff, 0);
+
+ mips_expect ("Bpt ");
+
+ if (!mips_getstring (tbuff, remote_timeout))
+ return 1;
+ tbuff[2] = '\0'; /* terminate the string */
+ if (sscanf (tbuff, "%d", &bpnum) != 1)
+ {
+ fprintf_unfiltered (gdb_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';
+
+ /* FIXME!! only 8 bytes! need to expand for Bfd64;
+ which targets return 64-bit addresses? PMON returns only 32! */
+ if (!mips_getstring (&tbuff[2], 8))
+ return 1;
+ tbuff[10] = '\0'; /* terminate the string */
+
+ if (sscanf (tbuff, "0x%08x", &bpaddr) != 1)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "Invalid hex address from target: %s\n", tbuff);
+ return 1;
+ }
+
+ if (bpnum >= PMON_MAX_BP)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n",
+ bpnum, PMON_MAX_BP - 1);
+ return 1;
+ }
+
+ if (bpaddr != addr)
+ fprintf_unfiltered (gdb_stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr);
+
+ mips_pmon_bp_info[bpnum] = bpaddr;
+
+ mips_expect ("\r\n");
+ mips_expect (mips_monitor_prompt);
+
+ mips_enter_debug ();
+
+ return 0;
+ }
+
+ return mips_store_word (addr, BREAK_INSN, contents_cache);
+}
+
+static int
+pmon_remove_breakpoint (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 (gdb_stderr,
+ "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%s\n",
+ paddr_nz (addr));
+ return 1;
+ }
+
+ if (mips_exit_debug ())
+ mips_error ("Failed to exit debug mode");
+
+ sprintf (tbuff, "db %02d\r", 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
+
+
+/* Tell whether this target can support a hardware breakpoint. CNT
+ is the number of hardware breakpoints already installed. This
+ implements the TARGET_CAN_USE_HARDWARE_WATCHPOINT macro. */
+
+int
+remote_mips_can_use_hardware_watchpoint (int cnt)
+{
+ return cnt < MAX_LSI_BREAKPOINTS && strcmp (target_shortname, "lsi") == 0;
+}
+
+
+/* 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 (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;
+}
+
+
+/* Insert a hardware breakpoint. This works only on LSI targets, which
+ implement ordinary breakpoints using hardware facilities. */
+
+int
+remote_mips_insert_hw_breakpoint (CORE_ADDR addr, char *contents_cache)
+{
+ if (strcmp (target_shortname, "lsi") == 0)
+ return mips_insert_breakpoint (addr, contents_cache);
+ else
+ return -1;
+}
+
+
+/* Remove a hardware breakpoint. This works only on LSI targets, which
+ implement ordinary breakpoints using hardware facilities. */
+
+int
+remote_mips_remove_hw_breakpoint (CORE_ADDR addr, char *contents_cache)
+{
+ if (strcmp (target_shortname, "lsi") == 0)
+ return mips_remove_breakpoint (addr, contents_cache);
+ else
+ return -1;
+}
+
+/* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is 0
+ for a write watchpoint, 1 for a read watchpoint, or 2 for a read/write
+ watchpoint. */
+
+int
+remote_mips_set_watchpoint (CORE_ADDR addr, int len, int type)
+{
+ if (set_breakpoint (addr, len, type))
+ return -1;
+
+ return 0;
+}
+
+int
+remote_mips_remove_watchpoint (CORE_ADDR addr, int len, int type)
+{
+ if (clear_breakpoint (addr, len, type))
+ return -1;
+
+ return 0;
+}
+
+int
+remote_mips_stopped_by_watchpoint (void)
+{
+ return hit_watchpoint;
+}
+
+
+/* Insert a breakpoint. */
+
+static int
+set_breakpoint (CORE_ADDR addr, int len, enum break_type type)
+{
+ return common_breakpoint (1, addr, len, type);
+}
+
+
+/* Clear a breakpoint. */
+
+static int
+clear_breakpoint (CORE_ADDR addr, int len, enum break_type type)
+{
+ return common_breakpoint (0, addr, len, type);
}
+
+/* Check the error code from the return packet for an LSI breakpoint
+ command. If there's no error, just return 0. If it's a warning,
+ print the warning text and return 0. If it's an error, print
+ the error text and return 1. <ADDR> is the address of the breakpoint
+ that was being set. <RERRFLG> is the error code returned by PMON.
+ This is a helper function for common_breakpoint. */
+
static int
-mips_remove_breakpoint (addr, contents_cache)
- CORE_ADDR addr;
- char *contents_cache;
+check_lsi_error (CORE_ADDR addr, int rerrflg)
{
- return target_write_memory (addr, contents_cache, sizeof break_insn);
+ struct lsi_error *err;
+ char *saddr = paddr_nz (addr); /* printable address string */
+
+ if (rerrflg == 0) /* no error */
+ return 0;
+
+ /* Warnings can be ORed together, so check them all. */
+ if (rerrflg & W_WARN)
+ {
+ if (monitor_warnings)
+ {
+ int found = 0;
+ for (err = lsi_warning_table; err->code != 0; err++)
+ {
+ if ((err->code & rerrflg) == err->code)
+ {
+ found = 1;
+ fprintf_unfiltered (gdb_stderr,
+ "common_breakpoint (0x%s): Warning: %s\n",
+ saddr,
+ err->string);
+ }
+ }
+ if (!found)
+ fprintf_unfiltered (gdb_stderr,
+ "common_breakpoint (0x%s): Unknown warning: 0x%x\n",
+ saddr,
+ rerrflg);
+ }
+ return 0;
+ }
+
+ /* Errors are unique, i.e. can't be ORed together. */
+ for (err = lsi_error_table; err->code != 0; err++)
+ {
+ if ((err->code & rerrflg) == err->code)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "common_breakpoint (0x%s): Error: %s\n",
+ saddr,
+ err->string);
+ return 1;
+ }
+ }
+ fprintf_unfiltered (gdb_stderr,
+ "common_breakpoint (0x%s): Unknown error: 0x%x\n",
+ saddr,
+ rerrflg);
+ return 1;
+}
+
+
+/* This routine sends a breakpoint command to the remote target.
+
+ <SET> is 1 if setting a breakpoint, or 0 if clearing a breakpoint.
+ <ADDR> is the address of the breakpoint.
+ <LEN> the length of the region to break on.
+ <TYPE> is the type of breakpoint:
+ 0 = write (BREAK_WRITE)
+ 1 = read (BREAK_READ)
+ 2 = read/write (BREAK_ACCESS)
+ 3 = instruction fetch (BREAK_FETCH)
+
+ Return 0 if successful; otherwise 1. */
+
+static int
+common_breakpoint (int set, CORE_ADDR addr, int len, enum break_type type)
+{
+ char buf[DATA_MAXLEN + 1];
+ char cmd, rcmd;
+ int rpid, rerrflg, rresponse, rlen;
+ int nfields;
+
+ addr = ADDR_BITS_REMOVE (addr);
+
+ if (mips_monitor == MON_LSI)
+ {
+ if (set == 0) /* clear breakpoint */
+ {
+ /* The LSI PMON "clear breakpoint" has this form:
+ <pid> 'b' <bptn> 0x0
+ reply:
+ <pid> 'b' 0x0 <code>
+
+ <bptn> is a breakpoint number returned by an earlier 'B' command.
+ Possible return codes: OK, E_BPT. */
+
+ int i;
+
+ /* Search for the breakpoint in the table. */
+ for (i = 0; i < MAX_LSI_BREAKPOINTS; i++)
+ if (lsi_breakpoints[i].type == type
+ && lsi_breakpoints[i].addr == addr
+ && lsi_breakpoints[i].len == len)
+ break;
+
+ /* Clear the table entry and tell PMON to clear the breakpoint. */
+ if (i == MAX_LSI_BREAKPOINTS)
+ {
+ warning ("common_breakpoint: Attempt to clear bogus breakpoint at %s\n",
+ paddr_nz (addr));
+ return 1;
+ }
+
+ lsi_breakpoints[i].type = BREAK_UNUSED;
+ sprintf (buf, "0x0 b 0x%x 0x0", i);
+ mips_send_packet (buf, 1);
+
+ rlen = mips_receive_packet (buf, 1, mips_receive_wait);
+ buf[rlen] = '\0';
+
+ nfields = sscanf (buf, "0x%x b 0x0 0x%x", &rpid, &rerrflg);
+ if (nfields != 2)
+ mips_error ("common_breakpoint: Bad response from remote board: %s", buf);
+
+ return (check_lsi_error (addr, rerrflg));
+ }
+ else
+ /* set a breakpoint */
+ {
+ /* The LSI PMON "set breakpoint" command has this form:
+ <pid> 'B' <addr> 0x0
+ reply:
+ <pid> 'B' <bptn> <code>
+
+ The "set data breakpoint" command has this form:
+
+ <pid> 'A' <addr1> <type> [<addr2> [<value>]]
+
+ where: type= "0x1" = read
+ "0x2" = write
+ "0x3" = access (read or write)
+
+ The reply returns two values:
+ bptn - a breakpoint number, which is a small integer with
+ possible values of zero through 255.
+ code - an error return code, a value of zero indicates a
+ succesful completion, other values indicate various
+ errors and warnings.
+
+ Possible return codes: OK, W_QAL, E_QAL, E_OUT, E_NON.
+
+ */
+
+ if (type == BREAK_FETCH) /* instruction breakpoint */
+ {
+ cmd = 'B';
+ sprintf (buf, "0x0 B 0x%s 0x0", paddr_nz (addr));
+ }
+ else
+ /* watchpoint */
+ {
+ cmd = 'A';
+ sprintf (buf, "0x0 A 0x%s 0x%x 0x%s", paddr_nz (addr),
+ type == BREAK_READ ? 1 : (type == BREAK_WRITE ? 2 : 3),
+ paddr_nz (addr + len - 1));
+ }
+ mips_send_packet (buf, 1);
+
+ rlen = mips_receive_packet (buf, 1, mips_receive_wait);
+ buf[rlen] = '\0';
+
+ nfields = sscanf (buf, "0x%x %c 0x%x 0x%x",
+ &rpid, &rcmd, &rresponse, &rerrflg);
+ if (nfields != 4 || rcmd != cmd || rresponse > 255)
+ mips_error ("common_breakpoint: Bad response from remote board: %s", buf);
+
+ if (rerrflg != 0)
+ if (check_lsi_error (addr, rerrflg))
+ return 1;
+
+ /* rresponse contains PMON's breakpoint number. Record the
+ information for this breakpoint so we can clear it later. */
+ lsi_breakpoints[rresponse].type = type;
+ lsi_breakpoints[rresponse].addr = addr;
+ lsi_breakpoints[rresponse].len = len;
+
+ return 0;
+ }
+ }
+ else
+ {
+ /* On non-LSI targets, the breakpoint command has this form:
+ 0x0 <CMD> <ADDR> <MASK> <FLAGS>
+ <MASK> is a don't care mask for addresses.
+ <FLAGS> is any combination of `r', `w', or `f' for read/write/fetch.
+ */
+ unsigned long mask;
+
+ mask = calculate_mask (addr, len);
+ addr &= ~mask;
+
+ if (set) /* set a breakpoint */
+ {
+ char *flags;
+ switch (type)
+ {
+ case BREAK_WRITE: /* write */
+ flags = "w";
+ break;
+ case BREAK_READ: /* read */
+ flags = "r";
+ break;
+ case BREAK_ACCESS: /* read/write */
+ flags = "rw";
+ break;
+ case BREAK_FETCH: /* fetch */
+ flags = "f";
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, "failed internal consistency check");
+ }
+
+ cmd = 'B';
+ sprintf (buf, "0x0 B 0x%s 0x%s %s", paddr_nz (addr),
+ paddr_nz (mask), flags);
+ }
+ else
+ {
+ cmd = 'b';
+ sprintf (buf, "0x0 b 0x%s", paddr_nz (addr));
+ }
+
+ mips_send_packet (buf, 1);
+
+ rlen = mips_receive_packet (buf, 1, mips_receive_wait);
+ buf[rlen] = '\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)
+ {
+ /* Ddb returns "0x0 b 0x16 0x0\000", whereas
+ Cogent returns "0x0 b 0xffffffff 0x16\000": */
+ if (mips_monitor == MON_DDB)
+ rresponse = rerrflg;
+ if (rresponse != 22) /* invalid argument */
+ fprintf_unfiltered (gdb_stderr,
+ "common_breakpoint (0x%s): Got error: 0x%x\n",
+ paddr_nz (addr), rresponse);
+ return 1;
+ }
+ }
+ return 0;
}
\f
-/* The target vector. */
+static void
+send_srec (char *srec, int len, CORE_ADDR addr)
+{
+ while (1)
+ {
+ int ch;
+
+ SERIAL_WRITE (mips_desc, srec, len);
+
+ ch = mips_readchar (remote_timeout);
+
+ 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 %s! Retrying.\n", paddr_u (addr));
+ continue;
+ default:
+ error ("Download got unexpected ack char: 0x%x, retrying.\n", ch);
+ }
+ }
+}
+
+/* Download a binary file by converting it to S records. */
-struct target_ops mips_ops =
+static void
+mips_load_srec (char *args)
{
- "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 */
- generic_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 */
- 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 */
-};
+ bfd *abfd;
+ asection *s;
+ char *buffer, srec[1024];
+ unsigned int i;
+ unsigned 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: */
+ mips_send_command (LOAD_CMD, 0);
+
+ for (s = abfd->sections; s; s = s->next)
+ {
+ if (s->flags & SEC_LOAD)
+ {
+ unsigned int numbytes;
+
+ /* FIXME! vma too small????? */
+ printf_filtered ("%s\t: 0x%4lx .. 0x%4lx ", s->name,
+ (long) s->vma,
+ (long) (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 (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. */
+
+ /* FIXME!! bigger buf required for 64-bit! */
+ 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 (unsigned long v, char *p, int n, int *chksum)
+{
+ int count = (n / 6);
+
+ if ((n % 12) != 0)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n", n, (n == 1) ? "" : "s");
+ return (0);
+ }
+ if (n > 36)
+ {
+ fprintf_unfiltered (gdb_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 (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 (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, "\n");
+ *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 (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;
+}
+
+static int
+pmon_check_ack (char *mesg)
+{
+#if defined(DOETXACK)
+ int c;
+
+ if (!tftp_in_use)
+ {
+ c = SERIAL_READCHAR (udp_in_use ? udp_desc : mips_desc,
+ remote_timeout);
+ if ((c == SERIAL_TIMEOUT) || (c != 0x06))
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "Failed to receive valid ACK for %s\n", mesg);
+ return (-1); /* terminate the download */
+ }
+ }
+#endif /* DOETXACK */
+ return (0);
+}
+
+/* pmon_download - Send a sequence of characters to the PMON download port,
+ which is either a serial port or a UDP socket. */
+
+static void
+pmon_start_download (void)
+{
+ if (tftp_in_use)
+ {
+ /* Create the temporary download file. */
+ if ((tftp_file = fopen (tftp_localname, "w")) == NULL)
+ perror_with_name (tftp_localname);
+ }
+ else
+ {
+ mips_send_command (udp_in_use ? LOAD_CMD_UDP : LOAD_CMD, 0);
+ mips_expect ("Downloading from ");
+ mips_expect (udp_in_use ? "udp" : "tty0");
+ mips_expect (", ^C to abort\r\n");
+ }
+}
+
+static int
+mips_expect_download (char *string)
+{
+ if (!mips_expect (string))
+ {
+ fprintf_unfiltered (gdb_stderr, "Load did not complete successfully.\n");
+ if (tftp_in_use)
+ remove (tftp_localname); /* Remove temporary file */
+ return 0;
+ }
+ else
+ return 1;
+}
+
+static void
+pmon_check_entry_address (char *entry_address, int final)
+{
+ char hexnumber[9]; /* includes '\0' space */
+ mips_expect_timeout (entry_address, tftp_in_use ? 15 : remote_timeout);
+ sprintf (hexnumber, "%x", final);
+ mips_expect (hexnumber);
+ mips_expect ("\r\n");
+}
+
+static int
+pmon_check_total (int bintotal)
+{
+ char hexnumber[9]; /* includes '\0' space */
+ mips_expect ("\r\ntotal = 0x");
+ sprintf (hexnumber, "%x", bintotal);
+ mips_expect (hexnumber);
+ return mips_expect_download (" bytes\r\n");
+}
+
+static void
+pmon_end_download (int final, int bintotal)
+{
+ char hexnumber[9]; /* includes '\0' space */
+
+ if (tftp_in_use)
+ {
+ static char *load_cmd_prefix = "load -b -s ";
+ char *cmd;
+ struct stat stbuf;
+
+ /* Close off the temporary file containing the load data. */
+ fclose (tftp_file);
+ tftp_file = NULL;
+
+ /* Make the temporary file readable by the world. */
+ if (stat (tftp_localname, &stbuf) == 0)
+ chmod (tftp_localname, stbuf.st_mode | S_IROTH);
+
+ /* Must reinitialize the board to prevent PMON from crashing. */
+ mips_send_command ("initEther\r", -1);
+
+ /* Send the load command. */
+ cmd = xmalloc (strlen (load_cmd_prefix) + strlen (tftp_name) + 2);
+ strcpy (cmd, load_cmd_prefix);
+ strcat (cmd, tftp_name);
+ strcat (cmd, "\r");
+ mips_send_command (cmd, 0);
+ xfree (cmd);
+ if (!mips_expect_download ("Downloading from "))
+ return;
+ if (!mips_expect_download (tftp_name))
+ return;
+ if (!mips_expect_download (", ^C to abort\r\n"))
+ return;
+ }
+
+ /* Wait for the stuff that PMON prints after the load has completed.
+ The timeout value for use in the tftp case (15 seconds) was picked
+ arbitrarily but might be too small for really large downloads. FIXME. */
+ switch (mips_monitor)
+ {
+ case MON_LSI:
+ pmon_check_ack ("termination");
+ pmon_check_entry_address ("Entry address is ", final);
+ if (!pmon_check_total (bintotal))
+ return;
+ break;
+ default:
+ pmon_check_entry_address ("Entry Address = ", final);
+ pmon_check_ack ("termination");
+ if (!pmon_check_total (bintotal))
+ return;
+ break;
+ }
+
+ if (tftp_in_use)
+ remove (tftp_localname); /* Remove temporary file */
+}
+
+static void
+pmon_download (char *buffer, int length)
+{
+ if (tftp_in_use)
+ fwrite (buffer, 1, length, tftp_file);
+ else
+ SERIAL_WRITE (udp_in_use ? udp_desc : mips_desc, buffer, length);
+}
+
+static void
+pmon_load_fast (char *file)
+{
+ bfd *abfd;
+ asection *s;
+ unsigned char *binbuf;
+ char *buffer;
+ int reclen;
+ unsigned int csum = 0;
+ int hashmark = !tftp_in_use;
+ int bintotal = 0;
+ int final = 0;
+ 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\r", -1);
+ mips_send_command ("set dlecho off\r", -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: */
+ pmon_start_download ();
+
+ /* Zero the checksum */
+ sprintf (buffer, "/Kxx\n");
+ reclen = strlen (buffer);
+ pmon_download (buffer, reclen);
+ finished = pmon_check_ack ("/Kxx");
+
+ 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] = '\n';
+ buffer[3 + reclen] = '\0';
+ reclen += 3; /* for the initial escape code and carriage return */
+ pmon_download (buffer, reclen);
+ finished = pmon_check_ack ("/A");
+
+ if (!finished)
+ {
+ unsigned int binamount;
+ unsigned int zerofill = 0;
+ char *bp = buffer;
+ unsigned 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);
+ pmon_download (buffer, reclen);
+ finished = pmon_check_ack ("data record");
+ if (finished)
+ {
+ zerofill = 0; /* do not transmit pending zerofills */
+ break;
+ }
+
+ 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: */
+ pmon_download (buffer, reclen);
+ finished = pmon_check_ack ("record remnant");
+ }
+ }
+
+ putchar_unfiltered ('\n');
+ }
+
+ /* Terminate the transfer. We know that we have an empty output
+ buffer at this point. */
+ sprintf (buffer, "/E/E\n"); /* include dummy padding characters */
+ reclen = strlen (buffer);
+ pmon_download (buffer, reclen);
+
+ if (finished)
+ { /* Ignore the termination message: */
+ SERIAL_FLUSH_INPUT (udp_in_use ? udp_desc : mips_desc);
+ }
+ else
+ { /* Deal with termination message: */
+ pmon_end_download (final, bintotal);
+ }
+
+ return;
+}
+
+/* mips_load -- download a file. */
+
+static void
+mips_load (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_IDT)
+ pmon_load_fast (file);
+ else
+ mips_load_srec (file);
+
+ mips_initialize ();
+
+ /* Finally, make the PC point at the start address */
+ if (mips_monitor != MON_IDT)
+ {
+ /* Work around problem where PMON monitor updates the PC after a load
+ to a different value than GDB thinks it has. 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 ();
+}
+
+
+/* Pass the command argument as a packet to PMON verbatim. */
+
+static void
+pmon_command (char *args, int from_tty)
+{
+ char buf[DATA_MAXLEN + 1];
+ int rlen;
+
+ sprintf (buf, "0x0 %s", args);
+ mips_send_packet (buf, 1);
+ printf_filtered ("Send packet: %s\n", buf);
+
+ rlen = mips_receive_packet (buf, 1, mips_receive_wait);
+ buf[rlen] = '\0';
+ printf_filtered ("Received packet: %s\n", buf);
+}
\f
void
-_initialize_remote_mips ()
+_initialize_remote_mips (void)
{
+ /* Initialize the fields in mips_ops that are common to all four targets. */
+ mips_ops.to_longname = "Remote MIPS debugging over serial line";
+ mips_ops.to_close = mips_close;
+ mips_ops.to_detach = mips_detach;
+ mips_ops.to_resume = mips_resume;
+ mips_ops.to_fetch_registers = mips_fetch_registers;
+ mips_ops.to_store_registers = mips_store_registers;
+ mips_ops.to_prepare_to_store = mips_prepare_to_store;
+ mips_ops.to_xfer_memory = mips_xfer_memory;
+ mips_ops.to_files_info = mips_files_info;
+ mips_ops.to_insert_breakpoint = mips_insert_breakpoint;
+ mips_ops.to_remove_breakpoint = mips_remove_breakpoint;
+ mips_ops.to_kill = mips_kill;
+ mips_ops.to_load = mips_load;
+ mips_ops.to_create_inferior = mips_create_inferior;
+ mips_ops.to_mourn_inferior = mips_mourn_inferior;
+ mips_ops.to_stratum = process_stratum;
+ mips_ops.to_has_all_memory = 1;
+ mips_ops.to_has_memory = 1;
+ mips_ops.to_has_stack = 1;
+ mips_ops.to_has_registers = 1;
+ mips_ops.to_has_execution = 1;
+ mips_ops.to_magic = OPS_MAGIC;
+
+ /* Copy the common fields to all four target vectors. */
+ pmon_ops = ddb_ops = lsi_ops = mips_ops;
+
+ /* Initialize target-specific fields in the target vectors. */
+ mips_ops.to_shortname = "mips";
+ mips_ops.to_doc = "\
+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";
+ mips_ops.to_open = mips_open;
+ mips_ops.to_wait = mips_wait;
+
+ pmon_ops.to_shortname = "pmon";
+ pmon_ops.to_doc = "\
+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";
+ pmon_ops.to_open = pmon_open;
+ pmon_ops.to_wait = mips_wait;
+
+ ddb_ops.to_shortname = "ddb";
+ ddb_ops.to_doc = "\
+Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
+line. The first argument is the device it is connected to or, if it contains\n\
+a colon, HOST:PORT to access a board over a network. The optional second\n\
+parameter is the temporary file in the form HOST:FILENAME to be used for\n\
+TFTP downloads to the board. The optional third parameter is the local name\n\
+of the TFTP temporary file, if it differs from the filename seen by the board.";
+ ddb_ops.to_open = ddb_open;
+ ddb_ops.to_wait = mips_wait;
+
+ lsi_ops.to_shortname = "lsi";
+ lsi_ops.to_doc = pmon_ops.to_doc;
+ lsi_ops.to_open = lsi_open;
+ lsi_ops.to_wait = mips_wait;
+
+ /* Add the targets. */
add_target (&mips_ops);
+ add_target (&pmon_ops);
+ add_target (&ddb_ops);
+ add_target (&lsi_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_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\
+ 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);
+ &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);
+
+ add_show_from_set
+ (add_set_cmd ("monitor-prompt", class_obscure, var_string,
+ (char *) &mips_monitor_prompt,
+ "Set the prompt that GDB expects from the monitor.",
+ &setlist),
+ &showlist);
+
+ add_show_from_set (
+ add_set_cmd ("monitor-warnings", class_obscure, var_zinteger,
+ (char *) &monitor_warnings,
+ "Set printing of monitor warnings.\n"
+ "When enabled, monitor warnings about hardware breakpoints "
+ "will be displayed.",
+ &setlist),
+ &showlist);
+
+ add_com ("pmon <command>", class_obscure, pmon_command,
+ "Send a packet to PMON (must be in debug mode).");
+
+ add_show_from_set (add_set_cmd ("mask-address", no_class,
+ var_boolean, &mask_address_p,
+ "Set zeroing of upper 32 bits of 64-bit addresses when talking to PMON targets.\n\
+Use \"on\" to enable the masking and \"off\" to disable it.\n",
+ &setlist),
+ &showlist);
}
projects / deliverable / binutils-gdb.git / blobdiff