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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
commit071ea11e85eb9d529cc5eb3d35f6247466a21b99 (patch)
tree5deda65b8d7b04d1f4cbc534c3206d328e1267ec /gdb/remote-sds.c
parent1730ec6b1848f0f32154277f788fb29f88d8475b (diff)
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Initial creation of sourceware repository
Diffstat (limited to 'gdb/remote-sds.c')
-rw-r--r--gdb/remote-sds.c1206
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diff --git a/gdb/remote-sds.c b/gdb/remote-sds.c
deleted file mode 100644
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--- a/gdb/remote-sds.c
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-/* Remote target communications for serial-line targets using SDS' protocol.
- Copyright 1997 Free Software Foundation, Inc.
-
-This file is part of GDB.
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-/* This interface was written by studying the behavior of the SDS
- monitor on an ADS 821/860 board, and by consulting the
- documentation of the monitor that is available on Motorola's web
- site. -sts 8/13/97 */
-
-#include "defs.h"
-#include "gdb_string.h"
-#include <fcntl.h>
-#include "frame.h"
-#include "inferior.h"
-#include "bfd.h"
-#include "symfile.h"
-#include "target.h"
-#include "wait.h"
-#include "gdbcmd.h"
-#include "objfiles.h"
-#include "gdb-stabs.h"
-#include "gdbthread.h"
-#include "gdbcore.h"
-#include "dcache.h"
-
-#ifdef USG
-#include <sys/types.h>
-#endif
-
-#include <signal.h>
-#include "serial.h"
-
-extern void _initialize_remote_sds PARAMS ((void));
-
-/* Declarations of local functions. */
-
-static int sds_write_bytes PARAMS ((CORE_ADDR, char *, int));
-
-static int sds_read_bytes PARAMS ((CORE_ADDR, char *, int));
-
-static void sds_files_info PARAMS ((struct target_ops *ignore));
-
-static int sds_xfer_memory PARAMS ((CORE_ADDR, char *,
- int, int, struct target_ops *));
-
-static void sds_prepare_to_store PARAMS ((void));
-
-static void sds_fetch_registers PARAMS ((int));
-
-static void sds_resume PARAMS ((int, int, enum target_signal));
-
-static int sds_start_remote PARAMS ((PTR));
-
-static void sds_open PARAMS ((char *, int));
-
-static void sds_close PARAMS ((int));
-
-static void sds_store_registers PARAMS ((int));
-
-static void sds_mourn PARAMS ((void));
-
-static void sds_create_inferior PARAMS ((char *, char *, char **));
-
-static void sds_load PARAMS ((char *, int));
-
-static int getmessage PARAMS ((unsigned char *, int));
-
-static int putmessage PARAMS ((unsigned char *, int));
-
-static int sds_send PARAMS ((unsigned char *, int));
-
-static int readchar PARAMS ((int));
-
-static int sds_wait PARAMS ((int, struct target_waitstatus *));
-
-static void sds_kill PARAMS ((void));
-
-static int tohex PARAMS ((int));
-
-static int fromhex PARAMS ((int));
-
-static void sds_detach PARAMS ((char *, int));
-
-static void sds_interrupt PARAMS ((int));
-
-static void sds_interrupt_twice PARAMS ((int));
-
-static void interrupt_query PARAMS ((void));
-
-static int read_frame PARAMS ((char *));
-
-static int sds_insert_breakpoint PARAMS ((CORE_ADDR, char *));
-
-static int sds_remove_breakpoint PARAMS ((CORE_ADDR, char *));
-
-static void init_sds_ops PARAMS ((void));
-
-static void sds_command PARAMS ((char *args, int from_tty));
-
-/* Define the target operations vector. */
-
-static struct target_ops sds_ops;
-
-/* This was 5 seconds, which is a long time to sit and wait.
- Unless this is going though some terminal server or multiplexer or
- other form of hairy serial connection, I would think 2 seconds would
- be plenty. */
-
-static int sds_timeout = 2;
-
-/* Descriptor for I/O to remote machine. Initialize it to NULL so
- that sds_open knows that we don't have a file open when the program
- starts. */
-
-static serial_t sds_desc = NULL;
-
-/* This limit comes from the monitor. */
-
-#define PBUFSIZ 250
-
-/* Maximum number of bytes to read/write at once. The value here
- is chosen to fill up a packet (the headers account for the 32). */
-#define MAXBUFBYTES ((PBUFSIZ-32)/2)
-
-static int next_msg_id;
-
-static int just_started;
-
-static int message_pending;
-
-
-/* Clean up connection to a remote debugger. */
-
-/* ARGSUSED */
-static void
-sds_close (quitting)
- int quitting;
-{
- if (sds_desc)
- SERIAL_CLOSE (sds_desc);
- sds_desc = NULL;
-}
-
-/* Stub for catch_errors. */
-
-static int
-sds_start_remote (dummy)
- PTR dummy;
-{
- char c;
- unsigned char buf[200];
-
- immediate_quit = 1; /* Allow user to interrupt it */
-
- /* Ack any packet which the remote side has already sent. */
- SERIAL_WRITE (sds_desc, "{#*\r\n", 5);
- SERIAL_WRITE (sds_desc, "{#}\r\n", 5);
-
- while ((c = readchar (1)) >= 0)
- printf_unfiltered ("%c", c);
- printf_unfiltered ("\n");
-
- next_msg_id = 251;
-
- buf[0] = 26;
- sds_send (buf, 1);
-
- buf[0] = 0;
- sds_send (buf, 1);
-
- immediate_quit = 0;
-
- start_remote (); /* Initialize gdb process mechanisms */
- return 1;
-}
-
-/* Open a connection to a remote debugger.
- NAME is the filename used for communication. */
-
-static DCACHE *sds_dcache;
-
-static void
-sds_open (name, from_tty)
- char *name;
- int from_tty;
-{
- if (name == 0)
- error ("To open a remote debug connection, you need to specify what serial\n\
-device is attached to the remote system (e.g. /dev/ttya).");
-
- target_preopen (from_tty);
-
- unpush_target (&sds_ops);
-
- sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes);
-
- sds_desc = SERIAL_OPEN (name);
- if (!sds_desc)
- perror_with_name (name);
-
- if (baud_rate != -1)
- {
- if (SERIAL_SETBAUDRATE (sds_desc, baud_rate))
- {
- SERIAL_CLOSE (sds_desc);
- perror_with_name (name);
- }
- }
-
-
- SERIAL_RAW (sds_desc);
-
- /* If there is something sitting in the buffer we might take it as a
- response to a command, which would be bad. */
- SERIAL_FLUSH_INPUT (sds_desc);
-
- if (from_tty)
- {
- puts_filtered ("Remote debugging using ");
- puts_filtered (name);
- puts_filtered ("\n");
- }
- push_target (&sds_ops); /* Switch to using remote target now */
-
- just_started = 1;
-
- /* Start the remote connection; if error (0), discard this target.
- In particular, if the user quits, be sure to discard it (we'd be
- in an inconsistent state otherwise). */
- if (!catch_errors (sds_start_remote, NULL,
- "Couldn't establish connection to remote target\n",
- RETURN_MASK_ALL))
- pop_target ();
-}
-
-/* This takes a program previously attached to and detaches it. After
- this is done, GDB can be used to debug some other program. We
- better not have left any breakpoints in the target program or it'll
- die when it hits one. */
-
-static void
-sds_detach (args, from_tty)
- char *args;
- int from_tty;
-{
- char buf[PBUFSIZ];
-
- if (args)
- error ("Argument given to \"detach\" when remotely debugging.");
-
-#if 0
- /* Tell the remote target to detach. */
- strcpy (buf, "D");
- sds_send (buf, 1);
-#endif
-
- pop_target ();
- if (from_tty)
- puts_filtered ("Ending remote debugging.\n");
-}
-
-/* Convert hex digit A to a number. */
-
-static int
-fromhex (a)
- int a;
-{
- if (a >= '0' && a <= '9')
- return a - '0';
- else if (a >= 'a' && a <= 'f')
- return a - 'a' + 10;
- else
- error ("Reply contains invalid hex digit %d", a);
-}
-
-/* Convert number NIB to a hex digit. */
-
-static int
-tohex (nib)
- int nib;
-{
- if (nib < 10)
- return '0'+nib;
- else
- return 'a'+nib-10;
-}
-
-static int
-tob64 (inbuf, outbuf, len)
- unsigned char *inbuf;
- char *outbuf;
- int len;
-{
- int i, sum;
- char *p;
-
- if (len % 3 != 0)
- error ("bad length");
-
- p = outbuf;
- for (i = 0; i < len; i += 3)
- {
- /* Collect the next three bytes into a number. */
- sum = ((long) *inbuf++) << 16;
- sum |= ((long) *inbuf++) << 8;
- sum |= ((long) *inbuf++);
-
- /* Spit out 4 6-bit encodings. */
- *p++ = ((sum >> 18) & 0x3f) + '0';
- *p++ = ((sum >> 12) & 0x3f) + '0';
- *p++ = ((sum >> 6) & 0x3f) + '0';
- *p++ = (sum & 0x3f) + '0';
- }
- return (p - outbuf);
-}
-
-static int
-fromb64 (inbuf, outbuf, len)
- char *inbuf, *outbuf;
- int len;
-{
- int i, sum;
-
- if (len % 4 != 0)
- error ("bad length");
-
- for (i = 0; i < len; i += 4)
- {
- /* Collect 4 6-bit digits. */
- sum = (*inbuf++ - '0') << 18;
- sum |= (*inbuf++ - '0') << 12;
- sum |= (*inbuf++ - '0') << 6;
- sum |= (*inbuf++ - '0');
-
- /* Now take the resulting 24-bit number and get three bytes out
- of it. */
- *outbuf++ = (sum >> 16) & 0xff;
- *outbuf++ = (sum >> 8) & 0xff;
- *outbuf++ = sum & 0xff;
- }
-
- return (len / 4) * 3;
-}
-
-
-/* Tell the remote machine to resume. */
-
-static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
-int last_sent_step;
-
-static void
-sds_resume (pid, step, siggnal)
- int pid, step;
- enum target_signal siggnal;
-{
- unsigned char buf[PBUFSIZ];
-
- dcache_flush (sds_dcache);
-
- last_sent_signal = siggnal;
- last_sent_step = step;
-
- buf[0] = (step ? 21 : 20);
- buf[1] = 0; /* (should be signal?) */
-
- sds_send (buf, 2);
-}
-
-/* Send a message to target to halt it. Target will respond, and send
- us a message pending notice. */
-
-static void
-sds_interrupt (signo)
- int signo;
-{
- unsigned char buf[PBUFSIZ];
-
- /* If this doesn't work, try more severe steps. */
- signal (signo, sds_interrupt_twice);
-
- if (remote_debug)
- printf_unfiltered ("sds_interrupt called\n");
-
- buf[0] = 25;
- sds_send (buf, 1);
-}
-
-static void (*ofunc)();
-
-/* The user typed ^C twice. */
-
-static void
-sds_interrupt_twice (signo)
- int signo;
-{
- signal (signo, ofunc);
-
- interrupt_query ();
-
- signal (signo, sds_interrupt);
-}
-
-/* Ask the user what to do when an interrupt is received. */
-
-static void
-interrupt_query ()
-{
- target_terminal_ours ();
-
- if (query ("Interrupted while waiting for the program.\n\
-Give up (and stop debugging it)? "))
- {
- target_mourn_inferior ();
- return_to_top_level (RETURN_QUIT);
- }
-
- target_terminal_inferior ();
-}
-
-/* If nonzero, ignore the next kill. */
-int kill_kludge;
-
-/* Wait until the remote machine stops, then return, storing status in
- STATUS just as `wait' would. Returns "pid" (though it's not clear
- what, if anything, that means in the case of this target). */
-
-static int
-sds_wait (pid, status)
- int pid;
- struct target_waitstatus *status;
-{
- unsigned char buf[PBUFSIZ];
- int retlen;
-
- status->kind = TARGET_WAITKIND_EXITED;
- status->value.integer = 0;
-
- ofunc = (void (*)()) signal (SIGINT, sds_interrupt);
-
- signal (SIGINT, ofunc);
-
- if (just_started)
- {
- just_started = 0;
- status->kind = TARGET_WAITKIND_STOPPED;
- return inferior_pid;
- }
-
- while (1)
- {
- getmessage (buf, 1);
-
- if (message_pending)
- {
- buf[0] = 26;
- retlen = sds_send (buf, 1);
- if (remote_debug)
- {
- fprintf_unfiltered (gdb_stderr, "Signals: %04x %02x %02x\n",
- ((int) buf[0]) << 8 + buf[1],
- buf[2], buf[3]);
- }
- message_pending = 0;
- status->kind = TARGET_WAITKIND_STOPPED;
- status->value.sig = TARGET_SIGNAL_TRAP;
- goto got_status;
- }
- }
- got_status:
- return inferior_pid;
-}
-
-static unsigned char sprs[16];
-
-/* Read the remote registers into the block REGS. */
-/* Currently we just read all the registers, so we don't use regno. */
-
-/* ARGSUSED */
-static void
-sds_fetch_registers (regno)
- int regno;
-{
- unsigned char buf[PBUFSIZ];
- int i, retlen;
- char *p;
- char regs[REGISTER_BYTES];
-
- /* Unimplemented registers read as all bits zero. */
- memset (regs, 0, REGISTER_BYTES);
-
- buf[0] = 18;
- buf[1] = 1;
- buf[2] = 0;
- retlen = sds_send (buf, 3);
-
- for (i = 0; i < 4 * 6; ++i)
- regs[i + 4 * 32 + 8 * 32] = buf[i];
- for (i = 0; i < 4 * 4; ++i)
- sprs[i] = buf[i + 4 * 7];
-
- buf[0] = 18;
- buf[1] = 2;
- buf[2] = 0;
- retlen = sds_send (buf, 3);
-
- for (i = 0; i < retlen; i++)
- regs[i] = buf[i];
-
- /* (should warn about reply too short) */
-
- for (i = 0; i < NUM_REGS; i++)
- supply_register (i, &regs[REGISTER_BYTE(i)]);
-}
-
-/* Prepare to store registers. Since we may send them all, we have to
- read out the ones we don't want to change first. */
-
-static void
-sds_prepare_to_store ()
-{
- /* Make sure the entire registers array is valid. */
- read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
-}
-
-/* Store register REGNO, or all registers if REGNO == -1, from the contents
- of REGISTERS. FIXME: ignores errors. */
-
-static void
-sds_store_registers (regno)
- int regno;
-{
- unsigned char *p, buf[PBUFSIZ];
- int i;
-
- /* Store all the special-purpose registers. */
- p = buf;
- *p++ = 19;
- *p++ = 1;
- *p++ = 0;
- *p++ = 0;
- for (i = 0; i < 4 * 6; i++)
- *p++ = registers[i + 4 * 32 + 8 * 32];
- for (i = 0; i < 4 * 1; i++)
- *p++ = 0;
- for (i = 0; i < 4 * 4; i++)
- *p++ = sprs[i];
-
- sds_send (buf, p - buf);
-
- /* Store all the general-purpose registers. */
- p = buf;
- *p++ = 19;
- *p++ = 2;
- *p++ = 0;
- *p++ = 0;
- for (i = 0; i < 4 * 32; i++)
- *p++ = registers[i];
-
- sds_send (buf, p - buf);
-
-}
-
-/* Write memory data directly to the remote machine. This does not
- inform the data cache; the data cache uses this. MEMADDR is the
- address in the remote memory space. MYADDR is the address of the
- buffer in our space. LEN is the number of bytes.
-
- Returns number of bytes transferred, or 0 for error. */
-
-static int
-sds_write_bytes (memaddr, myaddr, len)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
-{
- int max_buf_size; /* Max size of packet output buffer */
- int origlen;
- unsigned char buf[PBUFSIZ];
- int todo;
- int i;
-
- /* Chop the transfer down if necessary */
-
- max_buf_size = 150;
-
- origlen = len;
- while (len > 0)
- {
- todo = min (len, max_buf_size);
-
- buf[0] = 13;
- buf[1] = 0;
- buf[2] = (int) (memaddr >> 24) & 0xff;
- buf[3] = (int) (memaddr >> 16) & 0xff;
- buf[4] = (int) (memaddr >> 8) & 0xff;
- buf[5] = (int) (memaddr ) & 0xff;
- buf[6] = 1;
- buf[7] = 0;
-
- for (i = 0; i < todo; i++)
- buf[i + 8] = myaddr[i];
-
- sds_send (buf, 8 + todo);
-
- /* (should look at result) */
-
- myaddr += todo;
- memaddr += todo;
- len -= todo;
- }
- return origlen;
-}
-
-/* Read memory data directly from the remote machine. This does not
- use the data cache; the data cache uses this. MEMADDR is the
- address in the remote memory space. MYADDR is the address of the
- buffer in our space. LEN is the number of bytes.
-
- Returns number of bytes transferred, or 0 for error. */
-
-static int
-sds_read_bytes (memaddr, myaddr, len)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
-{
- int max_buf_size; /* Max size of packet output buffer */
- int origlen, retlen;
- unsigned char buf[PBUFSIZ];
- int todo;
- int i;
-
- /* Chop the transfer down if necessary */
-
- max_buf_size = 150;
-
- origlen = len;
- while (len > 0)
- {
- todo = min (len, max_buf_size);
-
- buf[0] = 12;
- buf[1] = 0;
- buf[2] = (int) (memaddr >> 24) & 0xff;
- buf[3] = (int) (memaddr >> 16) & 0xff;
- buf[4] = (int) (memaddr >> 8) & 0xff;
- buf[5] = (int) (memaddr ) & 0xff;
- buf[6] = (int) (todo >> 8) & 0xff;
- buf[7] = (int) (todo ) & 0xff;
- buf[8] = 1;
-
- retlen = sds_send (buf, 9);
-
- if (retlen - 2 != todo)
- {
- return 0;
- }
-
- /* Reply describes memory byte by byte. */
-
- for (i = 0; i < todo; i++)
- myaddr[i] = buf[i + 2];
-
- myaddr += todo;
- memaddr += todo;
- len -= todo;
- }
-
- return origlen;
-}
-
-/* Read or write LEN bytes from inferior memory at MEMADDR,
- transferring to or from debugger address MYADDR. Write to inferior
- if SHOULD_WRITE is nonzero. Returns length of data written or
- read; 0 for error. */
-
-/* ARGSUSED */
-static int
-sds_xfer_memory(memaddr, myaddr, len, should_write, target)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
- int should_write;
- struct target_ops *target; /* ignored */
-{
- return dcache_xfer_memory (sds_dcache, memaddr, myaddr, len, should_write);
-}
-
-
-static void
-sds_files_info (ignore)
- struct target_ops *ignore;
-{
- puts_filtered ("Debugging over a serial connection, using SDS protocol.\n");
-}
-
-/* Stuff for dealing with the packets which are part of this protocol.
- See comment at top of file for details. */
-
-/* Read a single character from the remote end, masking it down to 7 bits. */
-
-static int
-readchar (timeout)
- int timeout;
-{
- int ch;
-
- ch = SERIAL_READCHAR (sds_desc, timeout);
-
- if (remote_debug > 1 && ch >= 0)
- printf_unfiltered("%c(%x)", ch, ch);
-
- switch (ch)
- {
- case SERIAL_EOF:
- error ("Remote connection closed");
- case SERIAL_ERROR:
- perror_with_name ("Remote communication error");
- case SERIAL_TIMEOUT:
- return ch;
- default:
- return ch & 0x7f;
- }
-}
-
-/* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably
- because 253, 254, and 255 are special flags in the protocol.) */
-
-static int
-compute_checksum (csum, buf, len)
- int csum, len;
- char *buf;
-{
- int i;
-
- for (i = 0; i < len; ++i)
- csum += (unsigned char) buf[i];
-
- csum %= 253;
- return csum;
-}
-
-/* Send the command in BUF to the remote machine, and read the reply
- into BUF also. */
-
-static int
-sds_send (buf, len)
- unsigned char *buf;
- int len;
-{
- putmessage (buf, len);
-
- return getmessage (buf, 0);
-}
-
-/* Send a message to the remote machine. */
-
-static int
-putmessage (buf, len)
- unsigned char *buf;
- int len;
-{
- int i, enclen;
- unsigned char csum = 0;
- char buf2[PBUFSIZ], buf3[PBUFSIZ];
- unsigned char header[3];
- int ch;
- int tcount = 0;
- char *p;
-
- /* Copy the packet into buffer BUF2, encapsulating it
- and giving it a checksum. */
-
- if (len > 170) /* Prosanity check */
- abort();
-
- if (remote_debug)
- {
- fprintf_unfiltered (gdb_stderr, "Message to send: \"");
- for (i = 0; i < len; ++i)
- fprintf_unfiltered (gdb_stderr, "%02x", buf[i]);
- fprintf_unfiltered (gdb_stderr, "\"\n");
- }
-
- p = buf2;
- *p++ = '$';
-
- if (len % 3 != 0)
- {
- buf[len] = '\0';
- buf[len+1] = '\0';
- }
-
- header[1] = next_msg_id;
-
- header[2] = len;
-
- csum = compute_checksum (csum, buf, len);
- csum = compute_checksum (csum, header + 1, 2);
-
- header[0] = csum;
-
- tob64 (header, p, 3);
- p += 4;
- enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3);
-
- for (i = 0; i < enclen; ++i)
- *p++ = buf3[i];
- *p++ = '\r';
- *p++ = '\n';
-
- next_msg_id = (next_msg_id + 3) % 245;
-
- /* Send it over and over until we get a positive ack. */
-
- while (1)
- {
- int started_error_output = 0;
-
- if (remote_debug)
- {
- *p = '\0';
- printf_unfiltered ("Sending encoded: \"%s\"", buf2);
- printf_unfiltered (" (Checksum %d, id %d, length %d)\n",
- header[0], header[1], header[2]);
- gdb_flush (gdb_stdout);
- }
- if (SERIAL_WRITE (sds_desc, buf2, p - buf2))
- perror_with_name ("putmessage: write failed");
-
- return 1;
-
- }
-
-}
-
-/* Come here after finding the start of the frame. Collect the rest
- into BUF. Returns 0 on any error, 1 on success. */
-
-static int
-read_frame (buf)
- char *buf;
-{
- char *bp;
- int c;
-
- bp = buf;
-
- while (1)
- {
- c = readchar (sds_timeout);
-
- switch (c)
- {
- case SERIAL_TIMEOUT:
- if (remote_debug)
- puts_filtered ("Timeout in mid-message, retrying\n");
- return 0;
- case '$':
- if (remote_debug)
- puts_filtered ("Saw new packet start in middle of old one\n");
- return 0; /* Start a new packet, count retries */
- case '\r':
- break;
-
- case '\n':
- {
- *bp = '\000';
- if (remote_debug)
- fprintf_unfiltered (gdb_stderr, "Received encoded: \"%s\"\n",
- buf);
- return 1;
- }
-
- default:
- if (bp < buf + PBUFSIZ - 1)
- {
- *bp++ = c;
- continue;
- }
-
- *bp = '\0';
- puts_filtered ("Message too long: ");
- puts_filtered (buf);
- puts_filtered ("\n");
-
- return 0;
- }
- }
-}
-
-/* Read a packet from the remote machine, with error checking,
- and store it in BUF. BUF is expected to be of size PBUFSIZ.
- If FOREVER, wait forever rather than timing out; this is used
- while the target is executing user code. */
-
-static int
-getmessage (buf, forever)
- unsigned char *buf;
- int forever;
-{
- int c, c2, c3;
- int tries;
- int timeout;
- int val, i, len, csum;
- unsigned char header[3];
- unsigned char inbuf[500];
-
- strcpy (buf, "timeout");
-
- if (forever)
- {
-#ifdef MAINTENANCE_CMDS
- timeout = watchdog > 0 ? watchdog : -1;
-#else
- timeout = -1;
-#endif
- }
-
- else
- timeout = sds_timeout;
-
-#define MAX_TRIES 3
-
- for (tries = 1; tries <= MAX_TRIES; tries++)
- {
- /* This can loop forever if the remote side sends us characters
- continuously, but if it pauses, we'll get a zero from readchar
- because of timeout. Then we'll count that as a retry. */
-
- /* Note that we will only wait forever prior to the start of a packet.
- After that, we expect characters to arrive at a brisk pace. They
- should show up within sds_timeout intervals. */
-
- do
- {
- c = readchar (timeout);
-
- if (c == SERIAL_TIMEOUT)
- {
-#ifdef MAINTENANCE_CMDS
- if (forever) /* Watchdog went off. Kill the target. */
- {
- target_mourn_inferior ();
- error ("Watchdog has expired. Target detached.\n");
- }
-#endif
- if (remote_debug)
- puts_filtered ("Timed out.\n");
- goto retry;
- }
- }
- while (c != '$' && c != '{');
-
- /* We might have seen a "trigraph", a sequence of three characters
- that indicate various sorts of communication state. */
-
- if (c == '{')
- {
- /* Read the other two chars of the trigraph. */
- c2 = readchar (timeout);
- c3 = readchar (timeout);
- if (remote_debug)
- fprintf_unfiltered (gdb_stderr, "Trigraph %c%c%c received\n",
- c, c2, c3);
- if (c3 == '+')
- {
- message_pending = 1;
- return 0; /*????*/
- }
- continue;
- }
-
- val = read_frame (inbuf);
-
- if (val == 1)
- {
- fromb64 (inbuf, header, 4);
- /* (should check out other bits) */
- fromb64 (inbuf + 4, buf, strlen (inbuf) - 4);
-
- len = header[2];
-
- csum = 0;
- csum = compute_checksum (csum, buf, len);
- csum = compute_checksum (csum, header + 1, 2);
-
- if (csum != header[0])
- fprintf_unfiltered (gdb_stderr,
- "Checksum mismatch: computed %d, received %d\n",
- csum, header[0]);
-
- if (header[2] == 0xff)
- fprintf_unfiltered (gdb_stderr, "Requesting resend...\n");
-
- if (remote_debug)
- {
- fprintf_unfiltered (gdb_stderr,
- "... (Got checksum %d, id %d, length %d)\n",
- header[0], header[1], header[2]);
- fprintf_unfiltered (gdb_stderr, "Message received: \"");
- for (i = 0; i < len; ++i)
- {
- fprintf_unfiltered (gdb_stderr, "%02x", (unsigned char) buf[i]);
- }
- fprintf_unfiltered (gdb_stderr, "\"\n");
- }
-
- /* no ack required? */
- return len;
- }
-
- /* Try the whole thing again. */
- retry:
- /* need to do something here */
- }
-
- /* We have tried hard enough, and just can't receive the packet. Give up. */
-
- printf_unfiltered ("Ignoring packet error, continuing...\n");
- return 0;
-}
-
-static void
-sds_kill ()
-{
- /* Don't try to do anything to the target. */
-}
-
-static void
-sds_mourn ()
-{
- unpush_target (&sds_ops);
- generic_mourn_inferior ();
-}
-
-static void
-sds_create_inferior (exec_file, args, env)
- char *exec_file;
- char *args;
- char **env;
-{
- inferior_pid = 42000;
-
- /* Clean up from the last time we were running. */
- clear_proceed_status ();
-
- /* Let the remote process run. */
- proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0);
-}
-
-static void
-sds_load (filename, from_tty)
- char *filename;
- int from_tty;
-{
- generic_load (filename, from_tty);
-
- inferior_pid = 0;
-}
-
-/* The SDS monitor has commands for breakpoint insertion, although it
- it doesn't actually manage the breakpoints, it just returns the
- replaced instruction back to the debugger. */
-
-static int
-sds_insert_breakpoint (addr, contents_cache)
- CORE_ADDR addr;
- char *contents_cache;
-{
- int i, retlen;
- unsigned char *p, buf[PBUFSIZ];
-
- p = buf;
- *p++ = 16;
- *p++ = 0;
- *p++ = (int) (addr >> 24) & 0xff;
- *p++ = (int) (addr >> 16) & 0xff;
- *p++ = (int) (addr >> 8) & 0xff;
- *p++ = (int) (addr ) & 0xff;
-
- retlen = sds_send (buf, p - buf);
-
- for (i = 0; i < 4; ++i)
- contents_cache[i] = buf[i + 2];
-
- return 0;
-}
-
-static int
-sds_remove_breakpoint (addr, contents_cache)
- CORE_ADDR addr;
- char *contents_cache;
-{
- int i, retlen;
- unsigned char *p, buf[PBUFSIZ];
-
- p = buf;
- *p++ = 17;
- *p++ = 0;
- *p++ = (int) (addr >> 24) & 0xff;
- *p++ = (int) (addr >> 16) & 0xff;
- *p++ = (int) (addr >> 8) & 0xff;
- *p++ = (int) (addr ) & 0xff;
- for (i = 0; i < 4; ++i)
- *p++ = contents_cache[i];
-
- retlen = sds_send (buf, p - buf);
-
- return 0;
-}
-
-static void
-init_sds_ops ()
-{
- sds_ops.to_shortname = "sds";
- sds_ops.to_longname = "Remote serial target with SDS protocol";
- sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\
-Specify the serial device it is connected to (e.g. /dev/ttya).";
- sds_ops.to_open = sds_open;
- sds_ops.to_close = sds_close;
- sds_ops.to_detach = sds_detach;
- sds_ops.to_resume = sds_resume;
- sds_ops.to_wait = sds_wait;
- sds_ops.to_fetch_registers = sds_fetch_registers;
- sds_ops.to_store_registers = sds_store_registers;
- sds_ops.to_prepare_to_store = sds_prepare_to_store;
- sds_ops.to_xfer_memory = sds_xfer_memory;
- sds_ops.to_files_info = sds_files_info;
- sds_ops.to_insert_breakpoint = sds_insert_breakpoint;
- sds_ops.to_remove_breakpoint = sds_remove_breakpoint;
- sds_ops.to_kill = sds_kill;
- sds_ops.to_load = sds_load;
- sds_ops.to_create_inferior = sds_create_inferior;
- sds_ops.to_mourn_inferior = sds_mourn;
- sds_ops.to_stratum = process_stratum;
- sds_ops.to_has_all_memory = 1;
- sds_ops.to_has_memory = 1;
- sds_ops.to_has_stack = 1;
- sds_ops.to_has_registers = 1;
- sds_ops.to_has_execution = 1;
- sds_ops.to_magic = OPS_MAGIC;
-}
-
-/* Put a command string, in args, out to the monitor and display the
- reply message. */
-
-static void
-sds_command (args, from_tty)
- char *args;
- int from_tty;
-{
- char *p;
- int i, len, retlen;
- unsigned char buf[1000];
-
- /* Convert hexadecimal chars into a byte buffer. */
- p = args;
- len = 0;
- while (*p != '\0')
- {
- buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]);
- if (p[1] == '\0')
- break;
- p += 2;
- }
-
- retlen = sds_send (buf, len);
-
- printf_filtered ("Reply is ");
- for (i = 0; i < retlen; ++i)
- {
- printf_filtered ("%02x", buf[i]);
- }
- printf_filtered ("\n");
-}
-
-void
-_initialize_remote_sds ()
-{
- init_sds_ops ();
- add_target (&sds_ops);
-
- add_show_from_set (add_set_cmd ("sdstimeout", no_class,
- var_integer, (char *)&sds_timeout,
- "Set timeout value for sds read.\n", &setlist),
- &showlist);
-
- add_com ("sds", class_obscure, sds_command,
- "Send a command to the SDS monitor.");
-}