(we'd be in an inconsistent state otherwise). */
if (!catch_errors (remote_start_remote, (char *)0,
"Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
- pop_target();
+ {
+ pop_target();
+ return;
+ }
+
+ if (extended_p)
+ {
+ /* tell the remote that we're using the extended protocol. */
+ char buf[PBUFSIZ];
+ putpkt ("!");
+ getpkt (buf, 0);
+ }
+}
+
+/* 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
+remote_detach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ char buf[PBUFSIZ];
+
+ if (args)
+ error ("Argument given to \"detach\" when remotely debugging.");
+
+ /* Tell the remote target to detach. */
+ strcpy (buf, "D");
+ remote_send (buf);
+
+ pop_target ();
+ if (from_tty)
+ puts_filtered ("Ending remote debugging.\n");
+}
+
+/* Convert hex digit A to a number. */
+
+int
+fromhex (a)
+ int a;
+{
+ if (a >= '0' && a <= '9')
+ return a - '0';
+ else if (a >= 'a' && a <= 'f')
+ return a - 'a' + 10;
+ 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;
+}
+\f
+/* Tell the remote machine to resume. */
+
+static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
+int last_sent_step;
+
+static void
+remote_resume (pid, step, siggnal)
+ int pid, step;
+ enum target_signal siggnal;
+{
+ char buf[PBUFSIZ];
+
+ if (pid == -1)
+ set_thread (inferior_pid, 0);
+ else
+ set_thread (pid, 0);
+
+ dcache_flush (remote_dcache);
+
+ last_sent_signal = siggnal;
+ last_sent_step = step;
+
+ /* A hook for when we need to do something at the last moment before
+ resumption. */
+ if (target_resume_hook)
+ (*target_resume_hook) ();
+
+ if (siggnal != TARGET_SIGNAL_0)
+ {
+ buf[0] = step ? 'S' : 'C';
+ buf[1] = tohex (((int)siggnal >> 4) & 0xf);
+ buf[2] = tohex ((int)siggnal & 0xf);
+ buf[3] = '\0';
+ }
+ else
+ strcpy (buf, step ? "s": "c");
+
+ putpkt (buf);
+}
+\f
+/* Send ^C to target to halt it. Target will respond, and send us a
+ packet. */
+
+static void
+remote_interrupt (signo)
+ int signo;
+{
+ /* If this doesn't work, try more severe steps. */
+ signal (signo, remote_interrupt_twice);
+
+ if (remote_debug)
+ printf_unfiltered ("remote_interrupt called\n");
+
+ /* Send a break or a ^C, depending on user preference. */
+ if (remote_break)
+ SERIAL_SEND_BREAK (remote_desc);
+ else
+ SERIAL_WRITE (remote_desc, "\003", 1);
+}
+
+static void (*ofunc)();
+
+/* The user typed ^C twice. */
+static void
+remote_interrupt_twice (signo)
+ int signo;
+{
+ signal (signo, ofunc);
+
+ interrupt_query ();
+
+ signal (signo, remote_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;
+
+void
+remote_console_output (msg)
+ char *msg;
+{
+ char *p;
+
+ for (p = msg; *p; p +=2)
+ {
+ char tb[2];
+ char c = fromhex (p[0]) * 16 + fromhex (p[1]);
+ tb[0] = c;
+ tb[1] = 0;
+ if (target_output_hook)
+ target_output_hook (tb);
+ else
+ fputs_filtered (tb, gdb_stdout);
+ }
+}
+
+/* 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
+remote_wait (pid, status)
+ int pid;
+ struct target_waitstatus *status;
+{
+ unsigned char buf[PBUFSIZ];
+ int thread_num = -1;
+
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = 0;
+
+ while (1)
+ {
+ unsigned char *p;
+
+ ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
+ getpkt ((char *) buf, 1);
+ signal (SIGINT, ofunc);
+
+ /* This is a hook for when we need to do something (perhaps the
+ collection of trace data) every time the target stops. */
+ if (target_wait_loop_hook)
+ (*target_wait_loop_hook) ();
+
+ switch (buf[0])
+ {
+ case 'E': /* Error of some sort */
+ warning ("Remote failure reply: %s", buf);
+ continue;
+ case 'T': /* Status with PC, SP, FP, ... */
+ {
+ int i;
+ long regno;
+ char regs[MAX_REGISTER_RAW_SIZE];
+
+ /* Expedited reply, containing Signal, {regno, reg} repeat */
+ /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
+ ss = signal number
+ n... = register number
+ r... = register contents
+ */
+ p = &buf[3]; /* after Txx */
+
+ while (*p)
+ {
+ unsigned char *p1;
+ char *p_temp;
+
+ regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */
+ p1 = (unsigned char *)p_temp;
+
+ if (p1 == p)
+ {
+ p1 = (unsigned char *) strchr ((const char *) p, ':');
+ if (p1 == NULL)
+ warning ("Malformed packet (missing colon): %s\n\
+Packet: '%s'\n",
+ p, buf);
+ if (strncmp ((const char *) p, "thread", p1 - p) == 0)
+ {
+ thread_num = strtol ((const char *) ++p1, &p_temp, 16);
+ p = (unsigned char *)p_temp;
+ }
+ }
+ else
+ {
+ p = p1;
+
+ if (*p++ != ':')
+ warning ("Malformed packet (missing colon): %s\n\
+Packet: '%s'\n",
+ p, buf);
+
+ if (regno >= NUM_REGS)
+ warning ("Remote sent bad register number %ld: %s\n\
+Packet: '%s'\n",
+ regno, p, buf);
+
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i++)
+ {
+ if (p[0] == 0 || p[1] == 0)
+ warning ("Remote reply is too short: %s", buf);
+ regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+ supply_register (regno, regs);
+ }
+
+ if (*p++ != ';')
+ warning ("Remote register badly formatted: %s", buf);
+ }
+ }
+ /* fall through */
+ case 'S': /* Old style status, just signal only */
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = (enum target_signal)
+ (((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
+
+ goto got_status;
+ case 'W': /* Target exited */
+ {
+ /* The remote process exited. */
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]);
+ goto got_status;
+ }
+ case 'X':
+ status->kind = TARGET_WAITKIND_SIGNALLED;
+ status->value.sig = (enum target_signal)
+ (((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
+ kill_kludge = 1;
+
+ goto got_status;
+ case 'O': /* Console output */
+ remote_console_output (buf + 1);
+ continue;
+ case '\0':
+ if (last_sent_signal != TARGET_SIGNAL_0)
+ {
+ /* Zero length reply means that we tried 'S' or 'C' and
+ the remote system doesn't support it. */
+ target_terminal_ours_for_output ();
+ printf_filtered
+ ("Can't send signals to this remote system. %s not sent.\n",
+ target_signal_to_name (last_sent_signal));
+ last_sent_signal = TARGET_SIGNAL_0;
+ target_terminal_inferior ();
+
+ strcpy ((char *) buf, last_sent_step ? "s" : "c");
+ putpkt ((char *) buf);
+ continue;
+ }
+ /* else fallthrough */
+ default:
+ warning ("Invalid remote reply: %s", buf);
+ continue;
+ }
+ }
+ got_status:
+ if (thread_num != -1)
+ {
+ /* Initial thread value can only be acquired via wait, so deal with
+ this marker which is used before the first thread value is
+ acquired. */
+ if (inferior_pid == 42000)
+ {
+ inferior_pid = thread_num;
+ add_thread (inferior_pid);
+ }
+ return thread_num;
+ }
+ return inferior_pid;
+}
+
+/* Number of bytes of registers this stub implements. */
+static int register_bytes_found;
+
+/* Read the remote registers into the block REGS. */
+/* Currently we just read all the registers, so we don't use regno. */
+/* ARGSUSED */
+static void
+remote_fetch_registers (regno)
+ int regno;
+{
+ char buf[PBUFSIZ];
+ int i;
+ char *p;
+ char regs[REGISTER_BYTES];
+
+ set_thread (inferior_pid, 1);
+
+ sprintf (buf, "g");
+ remote_send (buf);
+
+ if (remote_register_buf_size == 0)
+ remote_register_buf_size = strlen (buf);
+
+ /* Unimplemented registers read as all bits zero. */
+ memset (regs, 0, REGISTER_BYTES);
+
+ /* We can get out of synch in various cases. If the first character
+ in the buffer is not a hex character, assume that has happened
+ and try to fetch another packet to read. */
+ while ((buf[0] < '0' || buf[0] > '9')
+ && (buf[0] < 'a' || buf[0] > 'f'))
+ {
+ if (remote_debug)
+ printf_unfiltered ("Bad register packet; fetching a new packet\n");
+ getpkt (buf, 0);
+ }
+
+ /* Reply describes registers byte by byte, each byte encoded as two
+ hex characters. Suck them all up, then supply them to the
+ register cacheing/storage mechanism. */
+
+ p = buf;
+ for (i = 0; i < REGISTER_BYTES; i++)
+ {
+ if (p[0] == 0)
+ break;
+ if (p[1] == 0)
+ {
+ warning ("Remote reply is of odd length: %s", buf);
+ /* Don't change register_bytes_found in this case, and don't
+ print a second warning. */
+ goto supply_them;
+ }
+ regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+
+ if (i != register_bytes_found)
+ {
+ register_bytes_found = i;
+#ifdef REGISTER_BYTES_OK
+ if (!REGISTER_BYTES_OK (i))
+ warning ("Remote reply is too short: %s", buf);
+#endif
+ }
+
+ supply_them:
+ for (i = 0; i < NUM_REGS; i++)
+ supply_register (i, ®s[REGISTER_BYTE(i)]);
+}
+
+/* Prepare to store registers. Since we may send them all (using a
+ 'G' request), we have to read out the ones we don't want to change
+ first. */
+
+static void
+remote_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
+remote_store_registers (regno)
+ int regno;
+{
+ char buf[PBUFSIZ];
+ int i;
+ char *p;
+
+ set_thread (inferior_pid, 1);
+
+ if (regno >= 0 && stub_supports_P)
+ {
+ /* Try storing a single register. */
+ char *regp;
+
+ sprintf (buf, "P%x=", regno);
+ p = buf + strlen (buf);
+ regp = ®isters[REGISTER_BYTE (regno)];
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i)
+ {
+ *p++ = tohex ((regp[i] >> 4) & 0xf);
+ *p++ = tohex (regp[i] & 0xf);
+ }
+ *p = '\0';
+ remote_send (buf);
+ if (buf[0] != '\0')
+ {
+ /* The stub understands the 'P' request. We are done. */
+ return;
+ }
+
+ /* The stub does not support the 'P' request. Use 'G' instead,
+ and don't try using 'P' in the future (it will just waste our
+ time). */
+ stub_supports_P = 0;
+ }
+
+ buf[0] = 'G';
+
+ /* Command describes registers byte by byte,
+ each byte encoded as two hex characters. */
+
+ p = buf + 1;
+ /* remote_prepare_to_store insures that register_bytes_found gets set. */
+ for (i = 0; i < register_bytes_found; i++)
+ {
+ *p++ = tohex ((registers[i] >> 4) & 0xf);
+ *p++ = tohex (registers[i] & 0xf);
+ }
+ *p = '\0';
+
+ remote_send (buf);
+}
+
+/*
+ Use of the data cache *used* to be disabled because it loses for looking at
+ and changing hardware I/O ports and the like. Accepting `volatile'
+ would perhaps be one way to fix it. Another idea would be to use the
+ executable file for the text segment (for all SEC_CODE sections?
+ For all SEC_READONLY sections?). This has problems if you want to
+ actually see what the memory contains (e.g. self-modifying code,
+ clobbered memory, user downloaded the wrong thing).
+
+ Because it speeds so much up, it's now enabled, if you're playing
+ with registers you turn it of (set remotecache 0)
+*/
+
+/* Read a word from remote address ADDR and return it.
+ This goes through the data cache. */
+
+#if 0 /* unused? */
+static int
+remote_fetch_word (addr)
+ CORE_ADDR addr;
+{
+ return dcache_fetch (remote_dcache, addr);
+}
+
+/* Write a word WORD into remote address ADDR.
+ This goes through the data cache. */
+
+static void
+remote_store_word (addr, word)
+ CORE_ADDR addr;
+ int word;
+{
+ dcache_poke (remote_dcache, addr, word);
+}
+#endif /* 0 (unused?) */
+
+\f
+
+/* Return the number of hex digits in num. */
+
+static int
+hexnumlen (num)
+ ULONGEST num;
+{
+ int i;
+
+ for (i = 0; num != 0; i++)
+ num >>= 4;
+
+ return max (i, 1);
+}
+
+/* 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
+remote_write_bytes (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ int max_buf_size; /* Max size of packet output buffer */
+ int origlen;
+
+ /* Chop the transfer down if necessary */
+
+ max_buf_size = min (remote_write_size, PBUFSIZ);
+ if (remote_register_buf_size != 0)
+ max_buf_size = min (max_buf_size, remote_register_buf_size);
+
+ /* Subtract header overhead from max payload size - $M<memaddr>,<len>:#nn */
+ max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4;
+
+ origlen = len;
+ while (len > 0)
+ {
+ char buf[PBUFSIZ];
+ char *p;
+ int todo;
+ int i;
+
+ todo = min (len, max_buf_size / 2); /* num bytes that will fit */
+
+ /* FIXME-32x64: Need a version of print_address_numeric which puts the
+ result in a buffer like sprintf. */
+ sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo);
+
+ /* We send target system values byte by byte, in increasing byte addresses,
+ each byte encoded as two hex characters. */
+
+ p = buf + strlen (buf);
+ for (i = 0; i < todo; i++)
+ {
+ *p++ = tohex ((myaddr[i] >> 4) & 0xf);
+ *p++ = tohex (myaddr[i] & 0xf);
+ }
+ *p = '\0';
+
+ putpkt (buf);
+ getpkt (buf, 0);
+
+ if (buf[0] == 'E')
+ {
+ /* There is no correspondance between what the remote protocol uses
+ for errors and errno codes. We would like a cleaner way of
+ representing errors (big enough to include errno codes, bfd_error
+ codes, and others). But for now just return EIO. */
+ errno = EIO;
+ return 0;
+ }
+ 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
+remote_read_bytes (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ int max_buf_size; /* Max size of packet output buffer */
+ int origlen;
+
+ /* Chop the transfer down if necessary */
+
+ max_buf_size = min (remote_write_size, PBUFSIZ);
+ if (remote_register_buf_size != 0)
+ max_buf_size = min (max_buf_size, remote_register_buf_size);
+
+ origlen = len;
+ while (len > 0)
+ {
+ char buf[PBUFSIZ];
+ char *p;
+ int todo;
+ int i;
+
+ todo = min (len, max_buf_size / 2); /* num bytes that will fit */
+
+ /* FIXME-32x64: Need a version of print_address_numeric which puts the
+ result in a buffer like sprintf. */
+ sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo);
+ putpkt (buf);
+ getpkt (buf, 0);
+
+ if (buf[0] == 'E')
+ {
+ /* There is no correspondance between what the remote protocol uses
+ for errors and errno codes. We would like a cleaner way of
+ representing errors (big enough to include errno codes, bfd_error
+ codes, and others). But for now just return EIO. */
+ errno = EIO;
+ return 0;
+ }
+
+ /* Reply describes memory byte by byte,
+ each byte encoded as two hex characters. */
+
+ p = buf;
+ for (i = 0; i < todo; i++)
+ {
+ if (p[0] == 0 || p[1] == 0)
+ /* Reply is short. This means that we were able to read only part
+ of what we wanted to. */
+ return i + (origlen - len);
+ myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+ myaddr += todo;
+ memaddr += todo;
+ len -= todo;
+ }
+ return origlen;
+}
+\f
+/* 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
+remote_xfer_memory(memaddr, myaddr, len, should_write, target)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+ int should_write;
+ struct target_ops *target; /* ignored */
+{
+#ifdef REMOTE_TRANSLATE_XFER_ADDRESS
+ CORE_ADDR targaddr;
+ int targlen;
+ REMOTE_TRANSLATE_XFER_ADDRESS (memaddr, len, targaddr, targlen);
+ if (targlen == 0)
+ return 0;
+ memaddr = targaddr;
+ len = targlen;
+#endif
+
+ return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write);
+}
+
+
+#if 0
+/* Enable after 4.12. */
+
+void
+remote_search (len, data, mask, startaddr, increment, lorange, hirange
+ addr_found, data_found)
+ int len;
+ char *data;
+ char *mask;
+ CORE_ADDR startaddr;
+ int increment;
+ CORE_ADDR lorange;
+ CORE_ADDR hirange;
+ CORE_ADDR *addr_found;
+ char *data_found;
+{
+ if (increment == -4 && len == 4)
+ {
+ long mask_long, data_long;
+ long data_found_long;
+ CORE_ADDR addr_we_found;
+ char buf[PBUFSIZ];
+ long returned_long[2];
+ char *p;
+
+ mask_long = extract_unsigned_integer (mask, len);
+ data_long = extract_unsigned_integer (data, len);
+ sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long);
+ putpkt (buf);
+ getpkt (buf, 0);
+ if (buf[0] == '\0')
+ {
+ /* The stub doesn't support the 't' request. We might want to
+ remember this fact, but on the other hand the stub could be
+ switched on us. Maybe we should remember it only until
+ the next "target remote". */
+ generic_search (len, data, mask, startaddr, increment, lorange,
+ hirange, addr_found, data_found);
+ return;
+ }
+
+ if (buf[0] == 'E')
+ /* There is no correspondance between what the remote protocol uses
+ for errors and errno codes. We would like a cleaner way of
+ representing errors (big enough to include errno codes, bfd_error
+ codes, and others). But for now just use EIO. */
+ memory_error (EIO, startaddr);
+ p = buf;
+ addr_we_found = 0;
+ while (*p != '\0' && *p != ',')
+ addr_we_found = (addr_we_found << 4) + fromhex (*p++);
+ if (*p == '\0')
+ error ("Protocol error: short return for search");
+
+ data_found_long = 0;
+ while (*p != '\0' && *p != ',')
+ data_found_long = (data_found_long << 4) + fromhex (*p++);
+ /* Ignore anything after this comma, for future extensions. */
+
+ if (addr_we_found < lorange || addr_we_found >= hirange)
+ {
+ *addr_found = 0;
+ return;
+ }
+
+ *addr_found = addr_we_found;
+ *data_found = store_unsigned_integer (data_we_found, len);
+ return;
+ }
+ generic_search (len, data, mask, startaddr, increment, lorange,
+ hirange, addr_found, data_found);
+}
+#endif /* 0 */
+\f
+static void
+remote_files_info (ignore)
+ struct target_ops *ignore;
+{
+ puts_filtered ("Debugging a target over a serial line.\n");
+}
+\f
+/* 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 (remote_desc, timeout);
+
+ 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;
+ }
+}
+
+/* Send the command in BUF to the remote machine,
+ and read the reply into BUF.
+ Report an error if we get an error reply. */
+
+static void
+remote_send (buf)
+ char *buf;
+{
+ putpkt (buf);
+ getpkt (buf, 0);
+
+ if (buf[0] == 'E')
+ error ("Remote failure reply: %s", buf);
+}
+
+/* Send a packet to the remote machine, with error checking.
+ The data of the packet is in BUF. */
+
+int
+putpkt (buf)
+ char *buf;
+{
+ int i;
+ unsigned char csum = 0;
+ char buf2[PBUFSIZ];
+ int cnt = strlen (buf);
+ int ch;
+ int tcount = 0;
+ char *p;
+
+ /* Copy the packet into buffer BUF2, encapsulating it
+ and giving it a checksum. */
+
+ if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */
+ abort();
+
+ p = buf2;
+ *p++ = '$';
+
+ for (i = 0; i < cnt; i++)
+ {
+ csum += buf[i];
+ *p++ = buf[i];
+ }
+ *p++ = '#';
+ *p++ = tohex ((csum >> 4) & 0xf);
+ *p++ = tohex (csum & 0xf);
+
+ /* 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 packet: %s...", buf2);
+ gdb_flush(gdb_stdout);
+ }
+ if (SERIAL_WRITE (remote_desc, buf2, p - buf2))
+ perror_with_name ("putpkt: write failed");
+
+ /* read until either a timeout occurs (-2) or '+' is read */
+ while (1)
+ {
+ ch = readchar (remote_timeout);
+
+ if (remote_debug)
+ {
+ switch (ch)
+ {
+ case '+':
+ case SERIAL_TIMEOUT:
+ case '$':
+ if (started_error_output)
+ {
+ putchar_unfiltered ('\n');
+ started_error_output = 0;
+ }
+ }
+ }
+
+ switch (ch)
+ {
+ case '+':
+ if (remote_debug)
+ printf_unfiltered("Ack\n");
+ return 1;
+ case SERIAL_TIMEOUT:
+ tcount ++;
+ if (tcount > 3)
+ return 0;
+ break; /* Retransmit buffer */
+ case '$':
+ {
+ char junkbuf[PBUFSIZ];
+
+ /* It's probably an old response, and we're out of sync. Just
+ gobble up the packet and ignore it. */
+ getpkt (junkbuf, 0);
+ continue; /* Now, go look for + */
+ }
+ default:
+ if (remote_debug)
+ {
+ if (!started_error_output)
+ {
+ started_error_output = 1;
+ printf_unfiltered ("putpkt: Junk: ");
+ }
+ putchar_unfiltered (ch & 0177);
+ }
+ continue;
+ }
+ break; /* Here to retransmit */
+ }
+
+#if 0
+ /* This is wrong. If doing a long backtrace, the user should be
+ able to get out next time we call QUIT, without anything as violent
+ as interrupt_query. If we want to provide a way out of here
+ without getting to the next QUIT, it should be based on hitting
+ ^C twice as in remote_wait. */
+ if (quit_flag)
+ {
+ quit_flag = 0;
+ interrupt_query ();
+ }
+#endif
+ }
+}
+
+/* Come here after finding the start of the frame. Collect the rest into BUF,
+ verifying the checksum, length, and handling run-length compression.
+ Returns 0 on any error, 1 on success. */
+
+static int
+read_frame (buf)
+ char *buf;
+{
+ unsigned char csum;
+ char *bp;
+ int c;
+
+ csum = 0;
+ bp = buf;
+
+ while (1)
+ {
+ c = readchar (remote_timeout);
+
+ switch (c)
+ {
+ case SERIAL_TIMEOUT:
+ if (remote_debug)
+ puts_filtered ("Timeout in mid-packet, 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 '#':
+ {
+ unsigned char pktcsum;
+
+ *bp = '\000';
+
+ pktcsum = fromhex (readchar (remote_timeout)) << 4;
+ pktcsum |= fromhex (readchar (remote_timeout));
+
+ if (csum == pktcsum)
+ return 1;
+
+ if (remote_debug)
+ {
+ printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
+ pktcsum, csum);
+ puts_filtered (buf);
+ puts_filtered ("\n");
+ }
+ return 0;
+ }
+ case '*': /* Run length encoding */
+ csum += c;
+ c = readchar (remote_timeout);
+ csum += c;
+ c = c - ' ' + 3; /* Compute repeat count */
+
+
+ if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1)
+ {
+ memset (bp, *(bp - 1), c);
+ bp += c;
+ continue;
+ }
+
+ *bp = '\0';
+ printf_filtered ("Repeat count %d too large for buffer: ", c);
+ puts_filtered (buf);
+ puts_filtered ("\n");
+ return 0;
+
+ default:
+ if (bp < buf + PBUFSIZ - 1)
+ {
+ *bp++ = c;
+ csum += c;
+ continue;
+ }
+
+ *bp = '\0';
+ puts_filtered ("Remote packet 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. */
+
+void
+getpkt (buf, forever)
+ char *buf;
+ int forever;
+{
+ int c;
+ int tries;
+ int timeout;
+ int val;
+
+ strcpy (buf,"timeout");
+
+ if (forever)
+ {
+#ifdef MAINTENANCE_CMDS
+ timeout = watchdog > 0 ? watchdog : -1;
+#else
+ timeout = -1;
+#endif
+ }
+
+ else
+ timeout = remote_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 remote_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 != '$');
+
+ /* We've found the start of a packet, now collect the data. */
+
+ val = read_frame (buf);
+
+ if (val == 1)
+ {
+ if (remote_debug)
+ fprintf_unfiltered (gdb_stdout, "Packet received: %s\n", buf);
+ SERIAL_WRITE (remote_desc, "+", 1);
+ return;
+ }
+
+ /* Try the whole thing again. */
+ retry:
+ SERIAL_WRITE (remote_desc, "-", 1);
+ }
+
+ /* We have tried hard enough, and just can't receive the packet. Give up. */
+
+ printf_unfiltered ("Ignoring packet error, continuing...\n");
+ SERIAL_WRITE (remote_desc, "+", 1);
+}
+\f
+static void
+remote_kill ()
+{
+ /* For some mysterious reason, wait_for_inferior calls kill instead of
+ mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */
+ if (kill_kludge)
+ {
+ kill_kludge = 0;
+ target_mourn_inferior ();
+ return;
+ }
+
+ /* Use catch_errors so the user can quit from gdb even when we aren't on
+ speaking terms with the remote system. */
+ catch_errors (putpkt, "k", "", RETURN_MASK_ERROR);
+
+ /* Don't wait for it to die. I'm not really sure it matters whether
+ we do or not. For the existing stubs, kill is a noop. */
+ target_mourn_inferior ();
+}
+
+static void
+remote_mourn ()
+{
+ remote_mourn_1 (&remote_ops);
+}
+
+static void
+extended_remote_mourn ()
+{
+ /* We do _not_ want to mourn the target like this; this will
+ remove the extended remote target from the target stack,
+ and the next time the user says "run" it'll fail.
+
+ FIXME: What is the right thing to do here? */
+#if 0
+ remote_mourn_1 (&extended_remote_ops);
+#endif
+}
+
+/* Worker function for remote_mourn. */
+static void
+remote_mourn_1 (target)
+ struct target_ops *target;
+{
+ unpush_target (target);
+ generic_mourn_inferior ();
+}
+
+/* In the extended protocol we want to be able to do things like
+ "run" and have them basically work as expected. So we need
+ a special create_inferior function.
+
+ FIXME: One day add support for changing the exec file
+ we're debugging, arguments and an environment. */
+
+static void
+extended_remote_create_inferior (exec_file, args, env)
+ char *exec_file;
+ char *args;
+ char **env;
+{
+ /* Rip out the breakpoints; we'll reinsert them after restarting
+ the remote server. */
+ remove_breakpoints ();
+
+ /* Now restart the remote server. */
+ extended_remote_restart ();
+
+ /* Now put the breakpoints back in. This way we're safe if the
+ restart function works via a unix fork on the remote side. */
+ insert_breakpoints ();
+
+ /* Clean up from the last time we were running. */
+ clear_proceed_status ();
+
+ /* Let the remote process run. */
+ proceed (-1, TARGET_SIGNAL_0, 0);
+}
+
+\f
+/* On some machines, e.g. 68k, we may use a different breakpoint instruction
+ than other targets; in those use REMOTE_BREAKPOINT instead of just
+ BREAKPOINT. Also, bi-endian targets may define LITTLE_REMOTE_BREAKPOINT
+ and BIG_REMOTE_BREAKPOINT. If none of these are defined, we just call
+ the standard routines that are in mem-break.c. */
+
+/* FIXME, these ought to be done in a more dynamic fashion. For instance,
+ the choice of breakpoint instruction affects target program design and
+ vice versa, and by making it user-tweakable, the special code here
+ goes away and we need fewer special GDB configurations. */
+
+#if defined (LITTLE_REMOTE_BREAKPOINT) && defined (BIG_REMOTE_BREAKPOINT) && !defined(REMOTE_BREAKPOINT)
+#define REMOTE_BREAKPOINT
+#endif
+
+#ifdef REMOTE_BREAKPOINT
+
+/* If the target isn't bi-endian, just pretend it is. */
+#if !defined (LITTLE_REMOTE_BREAKPOINT) && !defined (BIG_REMOTE_BREAKPOINT)
+#define LITTLE_REMOTE_BREAKPOINT REMOTE_BREAKPOINT
+#define BIG_REMOTE_BREAKPOINT REMOTE_BREAKPOINT
+#endif
+
+static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT;
+static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT;
+
+#endif /* REMOTE_BREAKPOINT */
+
+/* Insert a breakpoint on targets that don't have any better breakpoint
+ support. We read the contents of the target location and stash it,
+ then overwrite it with a breakpoint instruction. ADDR is the target
+ location in the target machine. CONTENTS_CACHE is a pointer to
+ memory allocated for saving the target contents. It is guaranteed
+ by the caller to be long enough to save sizeof BREAKPOINT bytes (this
+ is accomplished via BREAKPOINT_MAX). */
+
+static int
+remote_insert_breakpoint (addr, contents_cache)
+ CORE_ADDR addr;
+ char *contents_cache;
+{
+#ifdef REMOTE_BREAKPOINT
+ int val;
+
+ val = target_read_memory (addr, contents_cache, sizeof big_break_insn);
+
+ if (val == 0)
+ {
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ val = target_write_memory (addr, (char *) big_break_insn,
+ sizeof big_break_insn);
+ else
+ val = target_write_memory (addr, (char *) little_break_insn,
+ sizeof little_break_insn);
+ }
+
+ return val;
+#else
+ return memory_insert_breakpoint (addr, contents_cache);
+#endif /* REMOTE_BREAKPOINT */
+}
+
+static int
+remote_remove_breakpoint (addr, contents_cache)
+ CORE_ADDR addr;
+ char *contents_cache;
+{
+#ifdef REMOTE_BREAKPOINT
+ return target_write_memory (addr, contents_cache, sizeof big_break_insn);
+#else
+ return memory_remove_breakpoint (addr, contents_cache);
+#endif /* REMOTE_BREAKPOINT */
+}
+
+/* Some targets are only capable of doing downloads, and afterwards they switch
+ to the remote serial protocol. This function provides a clean way to get
+ from the download target to the remote target. It's basically just a
+ wrapper so that we don't have to expose any of the internal workings of
+ remote.c.
+
+ Prior to calling this routine, you should shutdown the current target code,
+ else you will get the "A program is being debugged already..." message.
+ Usually a call to pop_target() suffices.
+*/
+
+void
+push_remote_target (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ printf_filtered ("Switching to remote protocol\n");
+ remote_open (name, from_tty);
+}
+
+/* Other targets want to use the entire remote serial module but with
+ certain remote_ops overridden. */
+
+void
+open_remote_target (name, from_tty, target, extended_p)
+ char *name;
+ int from_tty;
+ struct target_ops *target;
+ int extended_p;
+{
+ printf_filtered ("Selecting the %sremote protocol\n",
+ (extended_p ? "extended-" : ""));
+ remote_open_1 (name, from_tty, target, extended_p);
+}
+
+/* Remote target communications for serial-line targets in custom GDB protocol
+ Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996, 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. */
+
+/* Remote communication protocol.
+
+ A debug packet whose contents are <data>
+ is encapsulated for transmission in the form:
+
+ $ <data> # CSUM1 CSUM2
+
+ <data> must be ASCII alphanumeric and cannot include characters
+ '$' or '#'. If <data> starts with two characters followed by
+ ':', then the existing stubs interpret this as a sequence number.
+
+ CSUM1 and CSUM2 are ascii hex representation of an 8-bit
+ checksum of <data>, the most significant nibble is sent first.
+ the hex digits 0-9,a-f are used.
+
+ Receiver responds with:
+
+ + - if CSUM is correct and ready for next packet
+ - - if CSUM is incorrect
+
+ <data> is as follows:
+ Most values are encoded in ascii hex digits. Signal numbers are according
+ to the numbering in target.h.
+
+ Request Packet
+
+ set thread Hct... Set thread for subsequent operations.
+ c = 'c' for thread used in step and
+ continue; t... can be -1 for all
+ threads.
+ c = 'g' for thread used in other
+ operations. If zero, pick a thread,
+ any thread.
+ reply OK for success
+ ENN for an error.
+
+ read registers g
+ reply XX....X Each byte of register data
+ is described by two hex digits.
+ Registers are in the internal order
+ for GDB, and the bytes in a register
+ are in the same order the machine uses.
+ or ENN for an error.
+
+ write regs GXX..XX Each byte of register data
+ is described by two hex digits.
+ reply OK for success
+ ENN for an error
+
+ write reg Pn...=r... Write register n... with value r...,
+ which contains two hex digits for each
+ byte in the register (target byte
+ order).
+ reply OK for success
+ ENN for an error
+ (not supported by all stubs).
+
+ read mem mAA..AA,LLLL AA..AA is address, LLLL is length.
+ reply XX..XX XX..XX is mem contents
+ Can be fewer bytes than requested
+ if able to read only part of the data.
+ or ENN NN is errno
+
+ write mem MAA..AA,LLLL:XX..XX
+ AA..AA is address,
+ LLLL is number of bytes,
+ XX..XX is data
+ reply OK for success
+ ENN for an error (this includes the case
+ where only part of the data was
+ written).
+
+ continue cAA..AA AA..AA is address to resume
+ If AA..AA is omitted,
+ resume at same address.
+
+ step sAA..AA AA..AA is address to resume
+ If AA..AA is omitted,
+ resume at same address.
+
+ continue with Csig;AA..AA Continue with signal sig (hex signal
+ signal number). If ;AA..AA is omitted, resume
+ at same address.
+
+ step with Ssig;AA..AA Like 'C' but step not continue.
+ signal
+
+ last signal ? Reply the current reason for stopping.
+ This is the same reply as is generated
+ for step or cont : SAA where AA is the
+ signal number.
+
+ detach D Reply OK.
+
+ There is no immediate reply to step or cont.
+ The reply comes when the machine stops.
+ It is SAA AA is the signal number.
+
+ or... TAAn...:r...;n...:r...;n...:r...;
+ AA = signal number
+ n... = register number (hex)
+ r... = register contents
+ n... = `thread'
+ r... = thread process ID. This is
+ a hex integer.
+ n... = other string not starting
+ with valid hex digit.
+ gdb should ignore this n,r pair
+ and go on to the next. This way
+ we can extend the protocol.
+ or... WAA The process exited, and AA is
+ the exit status. This is only
+ applicable for certains sorts of
+ targets.
+ or... XAA The process terminated with signal
+ AA.
+ or... OXX..XX XX..XX is hex encoding of ASCII data. This
+ can happen at any time while the program is
+ running and the debugger should
+ continue to wait for 'W', 'T', etc.
+
+ thread alive TXX Find out if the thread XX is alive.
+ reply OK thread is still alive
+ ENN thread is dead
+
+ remote restart RXX Restart the remote server
+
+ extended ops ! Use the extended remote protocol.
+ Sticky -- only needs to be set once.
+
+ kill request k
+
+ toggle debug d toggle debug flag (see 386 & 68k stubs)
+ reset r reset -- see sparc stub.
+ reserved <other> On other requests, the stub should
+ ignore the request and send an empty
+ response ($#<checksum>). This way
+ we can extend the protocol and GDB
+ can tell whether the stub it is
+ talking to uses the old or the new.
+ search tAA:PP,MM Search backwards starting at address
+ AA for a match with pattern PP and
+ mask MM. PP and MM are 4 bytes.
+ Not supported by all stubs.
+
+ general query qXXXX Request info about XXXX.
+ general set QXXXX=yyyy Set value of XXXX to yyyy.
+ query sect offs qOffsets Get section offsets. Reply is
+ Text=xxx;Data=yyy;Bss=zzz
+
+ Responses can be run-length encoded to save space. A '*' means that
+ the next character is an ASCII encoding giving a repeat count which
+ stands for that many repititions of the character preceding the '*'.
+ The encoding is n+29, yielding a printable character where n >=3
+ (which is where rle starts to win). Don't use an n > 126.
+
+ So
+ "0* " means the same as "0000". */
+
+#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 "terminal.h"*/
+#include "gdbcmd.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "gdbthread.h"
+
+#include "dcache.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <signal.h>
+#include "serial.h"
+
+/* Prototypes for local functions */
+
+static int remote_write_bytes PARAMS ((CORE_ADDR memaddr,
+ char *myaddr, int len));
+
+static int remote_read_bytes PARAMS ((CORE_ADDR memaddr,
+ char *myaddr, int len));
+
+static void remote_files_info PARAMS ((struct target_ops *ignore));
+
+static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr,
+ int len, int should_write,
+ struct target_ops *target));
+
+static void remote_prepare_to_store PARAMS ((void));
+
+static void remote_fetch_registers PARAMS ((int regno));
+
+static void remote_resume PARAMS ((int pid, int step,
+ enum target_signal siggnal));
+
+static int remote_start_remote PARAMS ((char *dummy));
+
+static void remote_open PARAMS ((char *name, int from_tty));
+
+static void extended_remote_open PARAMS ((char *name, int from_tty));
+
+static void remote_open_1 PARAMS ((char *, int, struct target_ops *, int extended_p));
+
+static void remote_close PARAMS ((int quitting));
+
+static void remote_store_registers PARAMS ((int regno));
+
+static void remote_mourn PARAMS ((void));
+
+static void extended_remote_restart PARAMS ((void));
+
+static void extended_remote_mourn PARAMS ((void));
+
+static void extended_remote_create_inferior PARAMS ((char *, char *, char **));
+
+static void remote_mourn_1 PARAMS ((struct target_ops *));
+
+static void remote_send PARAMS ((char *buf));
+
+static int readchar PARAMS ((int timeout));
+
+static int remote_wait PARAMS ((int pid, struct target_waitstatus *status));
+
+static void remote_kill PARAMS ((void));
+
+static int tohex PARAMS ((int nib));
+
+static void remote_detach PARAMS ((char *args, int from_tty));
+
+static void remote_interrupt PARAMS ((int signo));
+
+static void remote_interrupt_twice PARAMS ((int signo));
+
+static void interrupt_query PARAMS ((void));
+
+static void set_thread PARAMS ((int, int));
+
+static int remote_thread_alive PARAMS ((int));
+
+static void get_offsets PARAMS ((void));
+
+static int read_frame PARAMS ((char *));
+
+static int remote_insert_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static int remote_remove_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static int hexnumlen PARAMS ((ULONGEST num));
+
+/* exported functions */
+
+extern int fromhex PARAMS ((int a));
+extern void getpkt PARAMS ((char *buf, int forever));
+extern int putpkt PARAMS ((char *buf));
+
+/* Define the target subroutine names */
+
+static struct target_ops remote_ops ;
+
+static void init_remote_ops(void)
+{
+ remote_ops.to_shortname = "remote";
+ remote_ops.to_longname = "Remote serial target in gdb-specific protocol";
+ remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya)." ;
+ remote_ops.to_open = remote_open;
+ remote_ops.to_close = remote_close;
+ remote_ops.to_attach = NULL;
+ remote_ops.to_detach = remote_detach;
+ remote_ops.to_resume = remote_resume;
+ remote_ops.to_wait = remote_wait;
+ remote_ops.to_fetch_registers = remote_fetch_registers;
+ remote_ops.to_store_registers = remote_store_registers;
+ remote_ops.to_prepare_to_store = remote_prepare_to_store;
+ remote_ops.to_xfer_memory = remote_xfer_memory;
+ remote_ops.to_files_info = remote_files_info;
+ remote_ops.to_insert_breakpoint = remote_insert_breakpoint;
+ remote_ops.to_remove_breakpoint = remote_remove_breakpoint;
+ remote_ops.to_terminal_init = NULL;
+ remote_ops.to_terminal_inferior = NULL;
+ remote_ops.to_terminal_ours_for_output = NULL;
+ remote_ops.to_terminal_ours = NULL;
+ remote_ops.to_terminal_info = NULL;
+ remote_ops.to_kill = remote_kill;
+ remote_ops.to_load = generic_load;
+ remote_ops.to_lookup_symbol = NULL;
+ remote_ops.to_create_inferior = NULL;
+ remote_ops.to_mourn_inferior = remote_mourn;
+ remote_ops.to_can_run = 0;
+ remote_ops.to_notice_signals = 0;
+ remote_ops.to_thread_alive = remote_thread_alive;
+ remote_ops.to_stop = 0;
+ remote_ops.to_stratum = process_stratum;
+ remote_ops.DONT_USE = NULL;
+ remote_ops.to_has_all_memory = 1;
+ remote_ops.to_has_memory = 1;
+ remote_ops.to_has_stack = 1;
+ remote_ops.to_has_registers = 1;
+ remote_ops.to_has_execution = 1;
+ remote_ops.to_sections = NULL;
+ remote_ops.to_sections_end = NULL;
+ remote_ops.to_magic = OPS_MAGIC ;
+} /* init_remote_ops */
+
+static struct target_ops extended_remote_ops ;
+
+static void init_extended_remote_ops(void)
+{
+ extended_remote_ops.to_shortname = "extended-remote";
+ extended_remote_ops.to_longname = "Extended remote serial target in gdb-specific protocol";
+ extended_remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya).",
+ extended_remote_ops.to_open = extended_remote_open;
+ extended_remote_ops.to_close = remote_close;
+ extended_remote_ops.to_attach = NULL;
+ extended_remote_ops.to_detach = remote_detach;
+ extended_remote_ops.to_resume = remote_resume;
+ extended_remote_ops.to_wait = remote_wait;
+ extended_remote_ops.to_fetch_registers = remote_fetch_registers;
+ extended_remote_ops.to_store_registers = remote_store_registers;
+ extended_remote_ops.to_prepare_to_store = remote_prepare_to_store;
+ extended_remote_ops.to_xfer_memory = remote_xfer_memory;
+ extended_remote_ops.to_files_info = remote_files_info;
+ extended_remote_ops.to_insert_breakpoint = remote_insert_breakpoint;
+ extended_remote_ops.to_remove_breakpoint = remote_remove_breakpoint;
+ extended_remote_ops.to_terminal_init = NULL;
+ extended_remote_ops.to_terminal_inferior = NULL;
+ extended_remote_ops.to_terminal_ours_for_output = NULL;
+ extended_remote_ops.to_terminal_ours = NULL;
+ extended_remote_ops.to_terminal_info = NULL;
+ extended_remote_ops.to_kill = remote_kill;
+ extended_remote_ops.to_load = generic_load;
+ extended_remote_ops.to_lookup_symbol = NULL;
+ extended_remote_ops.to_create_inferior = extended_remote_create_inferior;
+ extended_remote_ops.to_mourn_inferior = extended_remote_mourn;
+ extended_remote_ops.to_can_run = 0;
+ extended_remote_ops.to_notice_signals = 0;
+ extended_remote_ops.to_thread_alive = remote_thread_alive;
+ extended_remote_ops.to_stop = 0;
+ extended_remote_ops.to_stratum = process_stratum;
+ extended_remote_ops.DONT_USE = NULL;
+ extended_remote_ops.to_has_all_memory = 1;
+ extended_remote_ops.to_has_memory = 1;
+ extended_remote_ops.to_has_stack = 1;
+ extended_remote_ops.to_has_registers = 1;
+ extended_remote_ops.to_has_execution = 1;
+ extended_remote_ops.to_sections = NULL;
+ extended_remote_ops.to_sections_end = NULL;
+ extended_remote_ops.to_magic = OPS_MAGIC ;
+}
+
+
+/* This was 5 seconds, which is a long time to sit and wait.
+ Unless this is going though some terminal server or multiplexer or
+ other form of hairy serial connection, I would think 2 seconds would
+ be plenty. */
+
+/* Changed to allow option to set timeout value.
+ was static int remote_timeout = 2; */
+extern int remote_timeout;
+
+/* This variable chooses whether to send a ^C or a break when the user
+ requests program interruption. Although ^C is usually what remote
+ systems expect, and that is the default here, sometimes a break is
+ preferable instead. */
+
+static int remote_break;
+
+/* Descriptor for I/O to remote machine. Initialize it to NULL so that
+ remote_open knows that we don't have a file open when the program
+ starts. */
+static serial_t remote_desc = NULL;
+
+/* Having this larger than 400 causes us to be incompatible with m68k-stub.c
+ and i386-stub.c. Normally, no one would notice because it only matters
+ for writing large chunks of memory (e.g. in downloads). Also, this needs
+ to be more than 400 if required to hold the registers (see below, where
+ we round it up based on REGISTER_BYTES). */
+#define PBUFSIZ 400
+
+/* 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)
+
+/* Round up PBUFSIZ to hold all the registers, at least. */
+/* The blank line after the #if seems to be required to work around a
+ bug in HP's PA compiler. */
+#if REGISTER_BYTES > MAXBUFBYTES
+
+#undef PBUFSIZ
+#define PBUFSIZ (REGISTER_BYTES * 2 + 32)
+#endif
+
+/* This variable sets the number of bytes to be written to the target
+ in a single packet. Normally PBUFSIZ is satisfactory, but some
+ targets need smaller values (perhaps because the receiving end
+ is slow). */
+
+static int remote_write_size = PBUFSIZ;
+
+/* This is the size (in chars) of the first response to the `g' command. This
+ is used to limit the size of the memory read and write commands to prevent
+ stub buffers from overflowing. The size does not include headers and
+ trailers, it is only the payload size. */
+
+static int remote_register_buf_size = 0;
+
+/* Should we try the 'P' request? If this is set to one when the stub
+ doesn't support 'P', the only consequence is some unnecessary traffic. */
+static int stub_supports_P = 1;
+
+/* These are pointers to hook functions that may be set in order to
+ modify resume/wait behavior for a particular architecture. */
+
+void (*target_resume_hook) PARAMS ((void));
+void (*target_wait_loop_hook) PARAMS ((void));
+
+\f
+/* These are the threads which we last sent to the remote system. -1 for all
+ or -2 for not sent yet. */
+int general_thread;
+int cont_thread;
+
+static void
+set_thread (th, gen)
+ int th;
+ int gen;
+{
+ char buf[PBUFSIZ];
+ int state = gen ? general_thread : cont_thread;
+ if (state == th)
+ return;
+ buf[0] = 'H';
+ buf[1] = gen ? 'g' : 'c';
+ if (th == 42000)
+ {
+ buf[2] = '0';
+ buf[3] = '\0';
+ }
+ else if (th < 0)
+ sprintf (&buf[2], "-%x", -th);
+ else
+ sprintf (&buf[2], "%x", th);
+ putpkt (buf);
+ getpkt (buf, 0);
+ if (gen)
+ general_thread = th;
+ else
+ cont_thread = th;
+}
+\f
+/* Return nonzero if the thread TH is still alive on the remote system. */
+
+static int
+remote_thread_alive (th)
+ int th;
+{
+ char buf[PBUFSIZ];
+
+ buf[0] = 'T';
+ if (th < 0)
+ sprintf (&buf[1], "-%x", -th);
+ else
+ sprintf (&buf[1], "%x", th);
+ putpkt (buf);
+ getpkt (buf, 0);
+ return (buf[0] == 'O' && buf[1] == 'K');
+}
+
+/* Restart the remote side; this is an extended protocol operation. */
+
+static void
+extended_remote_restart ()
+{
+ char buf[PBUFSIZ];
+
+ /* Send the restart command; for reasons I don't understand the
+ remote side really expects a number after the "R". */
+ buf[0] = 'R';
+ sprintf (&buf[1], "%x", 0);
+ putpkt (buf);
+
+ /* Now query for status so this looks just like we restarted
+ gdbserver from scratch. */
+ putpkt ("?");
+ getpkt (buf, 0);
+}
+\f
+/* Clean up connection to a remote debugger. */
+
+/* ARGSUSED */
+static void
+remote_close (quitting)
+ int quitting;
+{
+ if (remote_desc)
+ SERIAL_CLOSE (remote_desc);
+ remote_desc = NULL;
+}
+
+/* Query the remote side for the text, data and bss offsets. */
+
+static void
+get_offsets ()
+{
+ char buf[PBUFSIZ], *ptr;
+ int lose;
+ CORE_ADDR text_addr, data_addr, bss_addr;
+ struct section_offsets *offs;
+
+ putpkt ("qOffsets");
+
+ getpkt (buf, 0);
+
+ if (buf[0] == '\000')
+ return; /* Return silently. Stub doesn't support this
+ command. */
+ if (buf[0] == 'E')
+ {
+ warning ("Remote failure reply: %s", buf);
+ return;
+ }
+
+ /* Pick up each field in turn. This used to be done with scanf, but
+ scanf will make trouble if CORE_ADDR size doesn't match
+ conversion directives correctly. The following code will work
+ with any size of CORE_ADDR. */
+ text_addr = data_addr = bss_addr = 0;
+ ptr = buf;
+ lose = 0;
+
+ if (strncmp (ptr, "Text=", 5) == 0)
+ {
+ ptr += 5;
+ /* Don't use strtol, could lose on big values. */
+ while (*ptr && *ptr != ';')
+ text_addr = (text_addr << 4) + fromhex (*ptr++);
+ }
+ else
+ lose = 1;
+
+ if (!lose && strncmp (ptr, ";Data=", 6) == 0)
+ {
+ ptr += 6;
+ while (*ptr && *ptr != ';')
+ data_addr = (data_addr << 4) + fromhex (*ptr++);
+ }
+ else
+ lose = 1;
+
+ if (!lose && strncmp (ptr, ";Bss=", 5) == 0)
+ {
+ ptr += 5;
+ while (*ptr && *ptr != ';')
+ bss_addr = (bss_addr << 4) + fromhex (*ptr++);
+ }
+ else
+ lose = 1;
+
+ if (lose)
+ error ("Malformed response to offset query, %s", buf);
+
+ if (symfile_objfile == NULL)
+ return;
+
+ offs = (struct section_offsets *) alloca (sizeof (struct section_offsets)
+ + symfile_objfile->num_sections
+ * sizeof (offs->offsets));
+ memcpy (offs, symfile_objfile->section_offsets,
+ sizeof (struct section_offsets)
+ + symfile_objfile->num_sections
+ * sizeof (offs->offsets));
+
+ ANOFFSET (offs, SECT_OFF_TEXT) = text_addr;
+
+ /* This is a temporary kludge to force data and bss to use the same offsets
+ because that's what nlmconv does now. The real solution requires changes
+ to the stub and remote.c that I don't have time to do right now. */
+
+ ANOFFSET (offs, SECT_OFF_DATA) = data_addr;
+ ANOFFSET (offs, SECT_OFF_BSS) = data_addr;
+
+ objfile_relocate (symfile_objfile, offs);
+}
+
+/* Stub for catch_errors. */
+
+static int
+remote_start_remote (dummy)
+ char *dummy;
+{
+ immediate_quit = 1; /* Allow user to interrupt it */
+
+ /* Ack any packet which the remote side has already sent. */
+ SERIAL_WRITE (remote_desc, "+", 1);
+
+ /* Let the stub know that we want it to return the thread. */
+ set_thread (-1, 0);
+
+ get_offsets (); /* Get text, data & bss offsets */
+
+ putpkt ("?"); /* initiate a query from remote machine */
+ 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 void
+remote_open (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ remote_open_1 (name, from_tty, &remote_ops, 0);
+}
+
+/* Open a connection to a remote debugger using the extended
+ remote gdb protocol. NAME is the filename used for communication. */
+
+static void
+extended_remote_open (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ remote_open_1 (name, from_tty, &extended_remote_ops, 1/*extended_p*/);
+}
+
+/* Generic code for opening a connection to a remote target. */
+static DCACHE *remote_dcache;
+
+static void
+remote_open_1 (name, from_tty, target, extended_p)
+ char *name;
+ int from_tty;
+ struct target_ops *target;
+ int extended_p;
+{
+ 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 (target);
+
+ remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes);
+
+ remote_desc = SERIAL_OPEN (name);
+ if (!remote_desc)
+ perror_with_name (name);
+
+ if (baud_rate != -1)
+ {
+ if (SERIAL_SETBAUDRATE (remote_desc, baud_rate))
+ {
+ SERIAL_CLOSE (remote_desc);
+ perror_with_name (name);
+ }
+ }
+
+
+ SERIAL_RAW (remote_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 (remote_desc);
+
+ if (from_tty)
+ {
+ puts_filtered ("Remote debugging using ");
+ puts_filtered (name);
+ puts_filtered ("\n");
+ }
+ push_target (target); /* Switch to using remote target now */
+
+ /* Start out by trying the 'P' request to set registers. We set this each
+ time that we open a new target so that if the user switches from one
+ stub to another, we can (if the target is closed and reopened) cope. */
+ stub_supports_P = 1;
+
+ general_thread = -2;
+ cont_thread = -2;
+
+ /* Without this, some commands which require an active target (such as kill)
+ won't work. This variable serves (at least) double duty as both the pid
+ of the target process (if it has such), and as a flag indicating that a
+ target is active. These functions should be split out into seperate
+ variables, especially since GDB will someday have a notion of debugging
+ several processes. */
+
+ inferior_pid = 42000;
+ /* 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 (remote_start_remote, (char *)0,
+ "Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
+ {
+ pop_target();
+ return;
+ }
+
+ if (extended_p)
+ {
+ /* tell the remote that we're using the extended protocol. */
+ char buf[PBUFSIZ];
+ putpkt ("!");
+ getpkt (buf, 0);
+ }
+}
+
+/* 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
+remote_detach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ char buf[PBUFSIZ];
+
+ if (args)
+ error ("Argument given to \"detach\" when remotely debugging.");
+
+ /* Tell the remote target to detach. */
+ strcpy (buf, "D");
+ remote_send (buf);
+
+ pop_target ();
+ if (from_tty)
+ puts_filtered ("Ending remote debugging.\n");
+}
+
+/* Convert hex digit A to a number. */
+
+int
+fromhex (a)
+ int a;
+{
+ if (a >= '0' && a <= '9')
+ return a - '0';
+ else if (a >= 'a' && a <= 'f')
+ return a - 'a' + 10;
+ 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;
+}
+\f
+/* Tell the remote machine to resume. */
+
+static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
+int last_sent_step;
+
+static void
+remote_resume (pid, step, siggnal)
+ int pid, step;
+ enum target_signal siggnal;
+{
+ char buf[PBUFSIZ];
+
+ if (pid == -1)
+ set_thread (inferior_pid, 0);
+ else
+ set_thread (pid, 0);
+
+ dcache_flush (remote_dcache);
+
+ last_sent_signal = siggnal;
+ last_sent_step = step;
+
+ /* A hook for when we need to do something at the last moment before
+ resumption. */
+ if (target_resume_hook)
+ (*target_resume_hook) ();
+
+ if (siggnal != TARGET_SIGNAL_0)
+ {
+ buf[0] = step ? 'S' : 'C';
+ buf[1] = tohex (((int)siggnal >> 4) & 0xf);
+ buf[2] = tohex ((int)siggnal & 0xf);
+ buf[3] = '\0';
+ }
+ else
+ strcpy (buf, step ? "s": "c");
+
+ putpkt (buf);
+}
+\f
+/* Send ^C to target to halt it. Target will respond, and send us a
+ packet. */
+
+static void
+remote_interrupt (signo)
+ int signo;
+{
+ /* If this doesn't work, try more severe steps. */
+ signal (signo, remote_interrupt_twice);
+
+ if (remote_debug)
+ printf_unfiltered ("remote_interrupt called\n");
+
+ /* Send a break or a ^C, depending on user preference. */
+ if (remote_break)
+ SERIAL_SEND_BREAK (remote_desc);
+ else
+ SERIAL_WRITE (remote_desc, "\003", 1);
+}
+
+static void (*ofunc)();
+
+/* The user typed ^C twice. */
+static void
+remote_interrupt_twice (signo)
+ int signo;
+{
+ signal (signo, ofunc);
+
+ interrupt_query ();
+
+ signal (signo, remote_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;
+
+void
+remote_console_output (msg)
+ char *msg;
+{
+ char *p;
+
+ for (p = msg; *p; p +=2)
+ {
+ char tb[2];
+ char c = fromhex (p[0]) * 16 + fromhex (p[1]);
+ tb[0] = c;
+ tb[1] = 0;
+ if (target_output_hook)
+ target_output_hook (tb);
+ else
+ fputs_filtered (tb, gdb_stdout);
+ }
+}
+
+/* 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
+remote_wait (pid, status)
+ int pid;
+ struct target_waitstatus *status;
+{
+ unsigned char buf[PBUFSIZ];
+ int thread_num = -1;
+
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = 0;
+
+ while (1)
+ {
+ unsigned char *p;
+
+ ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
+ getpkt ((char *) buf, 1);
+ signal (SIGINT, ofunc);
+
+ /* This is a hook for when we need to do something (perhaps the
+ collection of trace data) every time the target stops. */
+ if (target_wait_loop_hook)
+ (*target_wait_loop_hook) ();
+
+ switch (buf[0])
+ {
+ case 'E': /* Error of some sort */
+ warning ("Remote failure reply: %s", buf);
+ continue;
+ case 'T': /* Status with PC, SP, FP, ... */
+ {
+ int i;
+ long regno;
+ char regs[MAX_REGISTER_RAW_SIZE];
+
+ /* Expedited reply, containing Signal, {regno, reg} repeat */
+ /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
+ ss = signal number
+ n... = register number
+ r... = register contents
+ */
+ p = &buf[3]; /* after Txx */
+
+ while (*p)
+ {
+ unsigned char *p1;
+ char *p_temp;
+
+ regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */
+ p1 = (unsigned char *)p_temp;
+
+ if (p1 == p)
+ {
+ p1 = (unsigned char *) strchr ((const char *) p, ':');
+ if (p1 == NULL)
+ warning ("Malformed packet (missing colon): %s\n\
+Packet: '%s'\n",
+ p, buf);
+ if (strncmp ((const char *) p, "thread", p1 - p) == 0)
+ {
+ thread_num = strtol ((const char *) ++p1, &p_temp, 16);
+ p = (unsigned char *)p_temp;
+ }
+ }
+ else
+ {
+ p = p1;
+
+ if (*p++ != ':')
+ warning ("Malformed packet (missing colon): %s\n\
+Packet: '%s'\n",
+ p, buf);
+
+ if (regno >= NUM_REGS)
+ warning ("Remote sent bad register number %ld: %s\n\
+Packet: '%s'\n",
+ regno, p, buf);
+
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i++)
+ {
+ if (p[0] == 0 || p[1] == 0)
+ warning ("Remote reply is too short: %s", buf);
+ regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+ supply_register (regno, regs);
+ }
+
+ if (*p++ != ';')
+ warning ("Remote register badly formatted: %s", buf);
+ }
+ }
+ /* fall through */
+ case 'S': /* Old style status, just signal only */
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = (enum target_signal)
+ (((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
+
+ goto got_status;
+ case 'W': /* Target exited */
+ {
+ /* The remote process exited. */
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]);
+ goto got_status;
+ }
+ case 'X':
+ status->kind = TARGET_WAITKIND_SIGNALLED;
+ status->value.sig = (enum target_signal)
+ (((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
+ kill_kludge = 1;
+
+ goto got_status;
+ case 'O': /* Console output */
+ remote_console_output (buf + 1);
+ continue;
+ case '\0':
+ if (last_sent_signal != TARGET_SIGNAL_0)
+ {
+ /* Zero length reply means that we tried 'S' or 'C' and
+ the remote system doesn't support it. */
+ target_terminal_ours_for_output ();
+ printf_filtered
+ ("Can't send signals to this remote system. %s not sent.\n",
+ target_signal_to_name (last_sent_signal));
+ last_sent_signal = TARGET_SIGNAL_0;
+ target_terminal_inferior ();
+
+ strcpy ((char *) buf, last_sent_step ? "s" : "c");
+ putpkt ((char *) buf);
+ continue;
+ }
+ /* else fallthrough */
+ default:
+ warning ("Invalid remote reply: %s", buf);
+ continue;
+ }
+ }
+ got_status:
+ if (thread_num != -1)
+ {
+ /* Initial thread value can only be acquired via wait, so deal with
+ this marker which is used before the first thread value is
+ acquired. */
+ if (inferior_pid == 42000)
+ {
+ inferior_pid = thread_num;
+ add_thread (inferior_pid);
+ }
+ return thread_num;
+ }
+ return inferior_pid;
+}
+
+/* Number of bytes of registers this stub implements. */
+static int register_bytes_found;
+
+/* Read the remote registers into the block REGS. */
+/* Currently we just read all the registers, so we don't use regno. */
+/* ARGSUSED */
+static void
+remote_fetch_registers (regno)
+ int regno;
+{
+ char buf[PBUFSIZ];
+ int i;
+ char *p;
+ char regs[REGISTER_BYTES];
+
+ set_thread (inferior_pid, 1);
+
+ sprintf (buf, "g");
+ remote_send (buf);
+
+ if (remote_register_buf_size == 0)
+ remote_register_buf_size = strlen (buf);
+
+ /* Unimplemented registers read as all bits zero. */
+ memset (regs, 0, REGISTER_BYTES);
+
+ /* We can get out of synch in various cases. If the first character
+ in the buffer is not a hex character, assume that has happened
+ and try to fetch another packet to read. */
+ while ((buf[0] < '0' || buf[0] > '9')
+ && (buf[0] < 'a' || buf[0] > 'f'))
+ {
+ if (remote_debug)
+ printf_unfiltered ("Bad register packet; fetching a new packet\n");
+ getpkt (buf, 0);
+ }
+
+ /* Reply describes registers byte by byte, each byte encoded as two
+ hex characters. Suck them all up, then supply them to the
+ register cacheing/storage mechanism. */
+
+ p = buf;
+ for (i = 0; i < REGISTER_BYTES; i++)
+ {
+ if (p[0] == 0)
+ break;
+ if (p[1] == 0)
+ {
+ warning ("Remote reply is of odd length: %s", buf);
+ /* Don't change register_bytes_found in this case, and don't
+ print a second warning. */
+ goto supply_them;
+ }
+ regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+
+ if (i != register_bytes_found)
+ {
+ register_bytes_found = i;
+#ifdef REGISTER_BYTES_OK
+ if (!REGISTER_BYTES_OK (i))
+ warning ("Remote reply is too short: %s", buf);
+#endif
+ }
+
+ supply_them:
+ for (i = 0; i < NUM_REGS; i++)
+ supply_register (i, ®s[REGISTER_BYTE(i)]);
+}
+
+/* Prepare to store registers. Since we may send them all (using a
+ 'G' request), we have to read out the ones we don't want to change
+ first. */
+
+static void
+remote_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
+remote_store_registers (regno)
+ int regno;
+{
+ char buf[PBUFSIZ];
+ int i;
+ char *p;
+
+ set_thread (inferior_pid, 1);
+
+ if (regno >= 0 && stub_supports_P)
+ {
+ /* Try storing a single register. */
+ char *regp;
+
+ sprintf (buf, "P%x=", regno);
+ p = buf + strlen (buf);
+ regp = ®isters[REGISTER_BYTE (regno)];
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i)
+ {
+ *p++ = tohex ((regp[i] >> 4) & 0xf);
+ *p++ = tohex (regp[i] & 0xf);
+ }
+ *p = '\0';
+ remote_send (buf);
+ if (buf[0] != '\0')
+ {
+ /* The stub understands the 'P' request. We are done. */
+ return;
+ }
+
+ /* The stub does not support the 'P' request. Use 'G' instead,
+ and don't try using 'P' in the future (it will just waste our
+ time). */
+ stub_supports_P = 0;
+ }
+
+ buf[0] = 'G';
+
+ /* Command describes registers byte by byte,
+ each byte encoded as two hex characters. */
+
+ p = buf + 1;
+ /* remote_prepare_to_store insures that register_bytes_found gets set. */
+ for (i = 0; i < register_bytes_found; i++)
+ {
+ *p++ = tohex ((registers[i] >> 4) & 0xf);
+ *p++ = tohex (registers[i] & 0xf);
+ }
+ *p = '\0';
+
+ remote_send (buf);
+}
+
+/*
+ Use of the data cache *used* to be disabled because it loses for looking at
+ and changing hardware I/O ports and the like. Accepting `volatile'
+ would perhaps be one way to fix it. Another idea would be to use the
+ executable file for the text segment (for all SEC_CODE sections?
+ For all SEC_READONLY sections?). This has problems if you want to
+ actually see what the memory contains (e.g. self-modifying code,
+ clobbered memory, user downloaded the wrong thing).
+
+ Because it speeds so much up, it's now enabled, if you're playing
+ with registers you turn it of (set remotecache 0)
+*/
+
+/* Read a word from remote address ADDR and return it.
+ This goes through the data cache. */
+
+#if 0 /* unused? */
+static int
+remote_fetch_word (addr)
+ CORE_ADDR addr;
+{
+ return dcache_fetch (remote_dcache, addr);
+}
+
+/* Write a word WORD into remote address ADDR.
+ This goes through the data cache. */
+
+static void
+remote_store_word (addr, word)
+ CORE_ADDR addr;
+ int word;
+{
+ dcache_poke (remote_dcache, addr, word);
+}
+#endif /* 0 (unused?) */
+
+\f
+
+/* Return the number of hex digits in num. */
+
+static int
+hexnumlen (num)
+ ULONGEST num;
+{
+ int i;
+
+ for (i = 0; num != 0; i++)
+ num >>= 4;
+
+ return max (i, 1);
+}
+
+/* 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
+remote_write_bytes (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ int max_buf_size; /* Max size of packet output buffer */
+ int origlen;
+
+ /* Chop the transfer down if necessary */
+
+ max_buf_size = min (remote_write_size, PBUFSIZ);
+ if (remote_register_buf_size != 0)
+ max_buf_size = min (max_buf_size, remote_register_buf_size);
+
+ /* Subtract header overhead from max payload size - $M<memaddr>,<len>:#nn */
+ max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4;
+
+ origlen = len;
+ while (len > 0)
+ {
+ char buf[PBUFSIZ];
+ char *p;
+ int todo;
+ int i;
+
+ todo = min (len, max_buf_size / 2); /* num bytes that will fit */
+
+ /* FIXME-32x64: Need a version of print_address_numeric which puts the
+ result in a buffer like sprintf. */
+ sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo);
+
+ /* We send target system values byte by byte, in increasing byte addresses,
+ each byte encoded as two hex characters. */
+
+ p = buf + strlen (buf);
+ for (i = 0; i < todo; i++)
+ {
+ *p++ = tohex ((myaddr[i] >> 4) & 0xf);
+ *p++ = tohex (myaddr[i] & 0xf);
+ }
+ *p = '\0';
+
+ putpkt (buf);
+ getpkt (buf, 0);
+
+ if (buf[0] == 'E')
+ {
+ /* There is no correspondance between what the remote protocol uses
+ for errors and errno codes. We would like a cleaner way of
+ representing errors (big enough to include errno codes, bfd_error
+ codes, and others). But for now just return EIO. */
+ errno = EIO;
+ return 0;
+ }
+ 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
+remote_read_bytes (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ int max_buf_size; /* Max size of packet output buffer */
+ int origlen;
+
+ /* Chop the transfer down if necessary */
+
+ max_buf_size = min (remote_write_size, PBUFSIZ);
+ if (remote_register_buf_size != 0)
+ max_buf_size = min (max_buf_size, remote_register_buf_size);
+
+ origlen = len;
+ while (len > 0)
+ {
+ char buf[PBUFSIZ];
+ char *p;
+ int todo;
+ int i;
+
+ todo = min (len, max_buf_size / 2); /* num bytes that will fit */
+
+ /* FIXME-32x64: Need a version of print_address_numeric which puts the
+ result in a buffer like sprintf. */
+ sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo);
+ putpkt (buf);
+ getpkt (buf, 0);
+
+ if (buf[0] == 'E')
+ {
+ /* There is no correspondance between what the remote protocol uses
+ for errors and errno codes. We would like a cleaner way of
+ representing errors (big enough to include errno codes, bfd_error
+ codes, and others). But for now just return EIO. */
+ errno = EIO;
+ return 0;
+ }
+
+ /* Reply describes memory byte by byte,
+ each byte encoded as two hex characters. */
+
+ p = buf;
+ for (i = 0; i < todo; i++)
+ {
+ if (p[0] == 0 || p[1] == 0)
+ /* Reply is short. This means that we were able to read only part
+ of what we wanted to. */
+ return i + (origlen - len);
+ myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ p += 2;
+ }
+ myaddr += todo;
+ memaddr += todo;
+ len -= todo;
+ }
+ return origlen;
+}
+\f
+/* 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
+remote_xfer_memory(memaddr, myaddr, len, should_write, target)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+ int should_write;
+ struct target_ops *target; /* ignored */
+{
+#ifdef REMOTE_TRANSLATE_XFER_ADDRESS
+ CORE_ADDR targaddr;
+ int targlen;
+ REMOTE_TRANSLATE_XFER_ADDRESS (memaddr, len, targaddr, targlen);
+ if (targlen == 0)
+ return 0;
+ memaddr = targaddr;
+ len = targlen;
+#endif
+
+ return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write);
+}
+
+
+#if 0
+/* Enable after 4.12. */
+
+void
+remote_search (len, data, mask, startaddr, increment, lorange, hirange
+ addr_found, data_found)
+ int len;
+ char *data;
+ char *mask;
+ CORE_ADDR startaddr;
+ int increment;
+ CORE_ADDR lorange;
+ CORE_ADDR hirange;
+ CORE_ADDR *addr_found;
+ char *data_found;
+{
+ if (increment == -4 && len == 4)
+ {
+ long mask_long, data_long;
+ long data_found_long;
+ CORE_ADDR addr_we_found;
+ char buf[PBUFSIZ];
+ long returned_long[2];
+ char *p;
+
+ mask_long = extract_unsigned_integer (mask, len);
+ data_long = extract_unsigned_integer (data, len);
+ sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long);
+ putpkt (buf);
+ getpkt (buf, 0);
+ if (buf[0] == '\0')
+ {
+ /* The stub doesn't support the 't' request. We might want to
+ remember this fact, but on the other hand the stub could be
+ switched on us. Maybe we should remember it only until
+ the next "target remote". */
+ generic_search (len, data, mask, startaddr, increment, lorange,
+ hirange, addr_found, data_found);
+ return;
+ }
+
+ if (buf[0] == 'E')
+ /* There is no correspondance between what the remote protocol uses
+ for errors and errno codes. We would like a cleaner way of
+ representing errors (big enough to include errno codes, bfd_error
+ codes, and others). But for now just use EIO. */
+ memory_error (EIO, startaddr);
+ p = buf;
+ addr_we_found = 0;
+ while (*p != '\0' && *p != ',')
+ addr_we_found = (addr_we_found << 4) + fromhex (*p++);
+ if (*p == '\0')
+ error ("Protocol error: short return for search");
+
+ data_found_long = 0;
+ while (*p != '\0' && *p != ',')
+ data_found_long = (data_found_long << 4) + fromhex (*p++);
+ /* Ignore anything after this comma, for future extensions. */
+
+ if (addr_we_found < lorange || addr_we_found >= hirange)
+ {
+ *addr_found = 0;
+ return;
+ }
+
+ *addr_found = addr_we_found;
+ *data_found = store_unsigned_integer (data_we_found, len);
+ return;
+ }
+ generic_search (len, data, mask, startaddr, increment, lorange,
+ hirange, addr_found, data_found);
+}
+#endif /* 0 */
+\f
+static void
+remote_files_info (ignore)
+ struct target_ops *ignore;
+{
+ puts_filtered ("Debugging a target over a serial line.\n");
+}
+\f
+/* 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 (remote_desc, timeout);
+
+ 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;
+ }
+}
+
+/* Send the command in BUF to the remote machine,
+ and read the reply into BUF.
+ Report an error if we get an error reply. */
+
+static void
+remote_send (buf)
+ char *buf;
+{
+ putpkt (buf);
+ getpkt (buf, 0);
+
+ if (buf[0] == 'E')
+ error ("Remote failure reply: %s", buf);
+}
+
+/* Send a packet to the remote machine, with error checking.
+ The data of the packet is in BUF. */
+
+int
+putpkt (buf)
+ char *buf;
+{
+ int i;
+ unsigned char csum = 0;
+ char buf2[PBUFSIZ];
+ int cnt = strlen (buf);
+ int ch;
+ int tcount = 0;
+ char *p;
+
+ /* Copy the packet into buffer BUF2, encapsulating it
+ and giving it a checksum. */
+
+ if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */
+ abort();
+
+ p = buf2;
+ *p++ = '$';
+
+ for (i = 0; i < cnt; i++)
+ {
+ csum += buf[i];
+ *p++ = buf[i];
+ }
+ *p++ = '#';
+ *p++ = tohex ((csum >> 4) & 0xf);
+ *p++ = tohex (csum & 0xf);
+
+ /* 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 packet: %s...", buf2);
+ gdb_flush(gdb_stdout);
+ }
+ if (SERIAL_WRITE (remote_desc, buf2, p - buf2))
+ perror_with_name ("putpkt: write failed");
+
+ /* read until either a timeout occurs (-2) or '+' is read */
+ while (1)
+ {
+ ch = readchar (remote_timeout);
+
+ if (remote_debug)
+ {
+ switch (ch)
+ {
+ case '+':
+ case SERIAL_TIMEOUT:
+ case '$':
+ if (started_error_output)
+ {
+ putchar_unfiltered ('\n');
+ started_error_output = 0;
+ }
+ }
+ }
+
+ switch (ch)
+ {
+ case '+':
+ if (remote_debug)
+ printf_unfiltered("Ack\n");
+ return 1;
+ case SERIAL_TIMEOUT:
+ tcount ++;
+ if (tcount > 3)
+ return 0;
+ break; /* Retransmit buffer */
+ case '$':
+ {
+ char junkbuf[PBUFSIZ];
+
+ /* It's probably an old response, and we're out of sync. Just
+ gobble up the packet and ignore it. */
+ getpkt (junkbuf, 0);
+ continue; /* Now, go look for + */
+ }
+ default:
+ if (remote_debug)
+ {
+ if (!started_error_output)
+ {
+ started_error_output = 1;
+ printf_unfiltered ("putpkt: Junk: ");
+ }
+ putchar_unfiltered (ch & 0177);
+ }
+ continue;
+ }
+ break; /* Here to retransmit */
+ }
+
+#if 0
+ /* This is wrong. If doing a long backtrace, the user should be
+ able to get out next time we call QUIT, without anything as violent
+ as interrupt_query. If we want to provide a way out of here
+ without getting to the next QUIT, it should be based on hitting
+ ^C twice as in remote_wait. */
+ if (quit_flag)
+ {
+ quit_flag = 0;
+ interrupt_query ();
+ }
+#endif
+ }
+}
+
+/* Come here after finding the start of the frame. Collect the rest into BUF,
+ verifying the checksum, length, and handling run-length compression.
+ Returns 0 on any error, 1 on success. */
+
+static int
+read_frame (buf)
+ char *buf;
+{
+ unsigned char csum;
+ char *bp;
+ int c;
+
+ csum = 0;
+ bp = buf;
+
+ while (1)
+ {
+ c = readchar (remote_timeout);
+
+ switch (c)
+ {
+ case SERIAL_TIMEOUT:
+ if (remote_debug)
+ puts_filtered ("Timeout in mid-packet, 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 '#':
+ {
+ unsigned char pktcsum;
+
+ *bp = '\000';
+
+ pktcsum = fromhex (readchar (remote_timeout)) << 4;
+ pktcsum |= fromhex (readchar (remote_timeout));
+
+ if (csum == pktcsum)
+ return 1;
+
+ if (remote_debug)
+ {
+ printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
+ pktcsum, csum);
+ puts_filtered (buf);
+ puts_filtered ("\n");
+ }
+ return 0;
+ }
+ case '*': /* Run length encoding */
+ csum += c;
+ c = readchar (remote_timeout);
+ csum += c;
+ c = c - ' ' + 3; /* Compute repeat count */
+
+
+ if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1)
+ {
+ memset (bp, *(bp - 1), c);
+ bp += c;
+ continue;
+ }
+
+ *bp = '\0';
+ printf_filtered ("Repeat count %d too large for buffer: ", c);
+ puts_filtered (buf);
+ puts_filtered ("\n");
+ return 0;
+
+ default:
+ if (bp < buf + PBUFSIZ - 1)
+ {
+ *bp++ = c;
+ csum += c;
+ continue;
+ }
+
+ *bp = '\0';
+ puts_filtered ("Remote packet 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. */
+
+void
+getpkt (buf, forever)
+ char *buf;
+ int forever;
+{
+ int c;
+ int tries;
+ int timeout;
+ int val;
+
+ strcpy (buf,"timeout");
+
+ if (forever)
+ {
+#ifdef MAINTENANCE_CMDS
+ timeout = watchdog > 0 ? watchdog : -1;
+#else
+ timeout = -1;
+#endif
+ }
+
+ else
+ timeout = remote_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 remote_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 != '$');
+
+ /* We've found the start of a packet, now collect the data. */
+
+ val = read_frame (buf);
+
+ if (val == 1)
+ {
+ if (remote_debug)
+ fprintf_unfiltered (gdb_stdout, "Packet received: %s\n", buf);
+ SERIAL_WRITE (remote_desc, "+", 1);
+ return;
+ }
+
+ /* Try the whole thing again. */
+ retry:
+ SERIAL_WRITE (remote_desc, "-", 1);
+ }
+
+ /* We have tried hard enough, and just can't receive the packet. Give up. */
+
+ printf_unfiltered ("Ignoring packet error, continuing...\n");
+ SERIAL_WRITE (remote_desc, "+", 1);
+}
+\f
+static void
+remote_kill ()
+{
+ /* For some mysterious reason, wait_for_inferior calls kill instead of
+ mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */
+ if (kill_kludge)
+ {
+ kill_kludge = 0;
+ target_mourn_inferior ();
+ return;
+ }
+
+ /* Use catch_errors so the user can quit from gdb even when we aren't on
+ speaking terms with the remote system. */
+ catch_errors (putpkt, "k", "", RETURN_MASK_ERROR);
+
+ /* Don't wait for it to die. I'm not really sure it matters whether
+ we do or not. For the existing stubs, kill is a noop. */
+ target_mourn_inferior ();
+}
+
+static void
+remote_mourn ()
+{
+ remote_mourn_1 (&remote_ops);
+}
+
+static void
+extended_remote_mourn ()
+{
+ /* We do _not_ want to mourn the target like this; this will
+ remove the extended remote target from the target stack,
+ and the next time the user says "run" it'll fail.
+
+ FIXME: What is the right thing to do here? */
+#if 0
+ remote_mourn_1 (&extended_remote_ops);
+#endif
+}
+
+/* Worker function for remote_mourn. */
+static void
+remote_mourn_1 (target)
+ struct target_ops *target;
+{
+ unpush_target (target);
+ generic_mourn_inferior ();
+}
+
+/* In the extended protocol we want to be able to do things like
+ "run" and have them basically work as expected. So we need
+ a special create_inferior function.
+
+ FIXME: One day add support for changing the exec file
+ we're debugging, arguments and an environment. */
+
+static void
+extended_remote_create_inferior (exec_file, args, env)
+ char *exec_file;
+ char *args;
+ char **env;
+{
+ /* Rip out the breakpoints; we'll reinsert them after restarting
+ the remote server. */
+ remove_breakpoints ();
+
+ /* Now restart the remote server. */
+ extended_remote_restart ();
+
+ /* Now put the breakpoints back in. This way we're safe if the
+ restart function works via a unix fork on the remote side. */
+ insert_breakpoints ();
+
+ /* Clean up from the last time we were running. */
+ clear_proceed_status ();
+
+ /* Let the remote process run. */
+ proceed (-1, TARGET_SIGNAL_0, 0);
+}
+
+\f
+/* On some machines, e.g. 68k, we may use a different breakpoint instruction
+ than other targets; in those use REMOTE_BREAKPOINT instead of just
+ BREAKPOINT. Also, bi-endian targets may define LITTLE_REMOTE_BREAKPOINT
+ and BIG_REMOTE_BREAKPOINT. If none of these are defined, we just call
+ the standard routines that are in mem-break.c. */
+
+/* FIXME, these ought to be done in a more dynamic fashion. For instance,
+ the choice of breakpoint instruction affects target program design and
+ vice versa, and by making it user-tweakable, the special code here
+ goes away and we need fewer special GDB configurations. */
+
+#if defined (LITTLE_REMOTE_BREAKPOINT) && defined (BIG_REMOTE_BREAKPOINT) && !defined(REMOTE_BREAKPOINT)
+#define REMOTE_BREAKPOINT
+#endif
+
+#ifdef REMOTE_BREAKPOINT
+
+/* If the target isn't bi-endian, just pretend it is. */
+#if !defined (LITTLE_REMOTE_BREAKPOINT) && !defined (BIG_REMOTE_BREAKPOINT)
+#define LITTLE_REMOTE_BREAKPOINT REMOTE_BREAKPOINT
+#define BIG_REMOTE_BREAKPOINT REMOTE_BREAKPOINT
+#endif
+
+static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT;
+static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT;
+
+#endif /* REMOTE_BREAKPOINT */
+
+/* Insert a breakpoint on targets that don't have any better breakpoint
+ support. We read the contents of the target location and stash it,
+ then overwrite it with a breakpoint instruction. ADDR is the target
+ location in the target machine. CONTENTS_CACHE is a pointer to
+ memory allocated for saving the target contents. It is guaranteed
+ by the caller to be long enough to save sizeof BREAKPOINT bytes (this
+ is accomplished via BREAKPOINT_MAX). */
+
+static int
+remote_insert_breakpoint (addr, contents_cache)
+ CORE_ADDR addr;
+ char *contents_cache;
+{
+#ifdef REMOTE_BREAKPOINT
+ int val;
+
+ val = target_read_memory (addr, contents_cache, sizeof big_break_insn);
+
+ if (val == 0)
+ {
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ val = target_write_memory (addr, (char *) big_break_insn,
+ sizeof big_break_insn);
+ else
+ val = target_write_memory (addr, (char *) little_break_insn,
+ sizeof little_break_insn);
+ }
+
+ return val;
+#else
+ return memory_insert_breakpoint (addr, contents_cache);
+#endif /* REMOTE_BREAKPOINT */
+}
+
+static int
+remote_remove_breakpoint (addr, contents_cache)
+ CORE_ADDR addr;
+ char *contents_cache;
+{
+#ifdef REMOTE_BREAKPOINT
+ return target_write_memory (addr, contents_cache, sizeof big_break_insn);
+#else
+ return memory_remove_breakpoint (addr, contents_cache);
+#endif /* REMOTE_BREAKPOINT */
+}
+
+/* Some targets are only capable of doing downloads, and afterwards they switch
+ to the remote serial protocol. This function provides a clean way to get
+ from the download target to the remote target. It's basically just a
+ wrapper so that we don't have to expose any of the internal workings of
+ remote.c.
+
+ Prior to calling this routine, you should shutdown the current target code,
+ else you will get the "A program is being debugged already..." message.
+ Usually a call to pop_target() suffices.
+*/
+
+void
+push_remote_target (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ printf_filtered ("Switching to remote protocol\n");
+ remote_open (name, from_tty);
+}
+
+/* Other targets want to use the entire remote serial module but with
+ certain remote_ops overridden. */
+
+void
+open_remote_target (name, from_tty, target, extended_p)
+ char *name;
+ int from_tty;
+ struct target_ops *target;
+ int extended_p;
+{
+ printf_filtered ("Selecting the %sremote protocol\n",
+ (extended_p ? "extended-" : ""));
+ remote_open_1 (name, from_tty, target, extended_p);
+}
+
+/* Table used by the crc32 function to calcuate the checksum. */
+static unsigned long crc32_table[256] = {0, 0};
+
+static unsigned long
+crc32 (buf, len, crc)
+ unsigned char *buf;
+ int len;
+ unsigned int crc;
+{
+ if (! crc32_table[1])
+ {
+ /* Initialize the CRC table and the decoding table. */
+ int i, j;
+ unsigned int c;
+
+ for (i = 0; i < 256; i++)
+ {
+ for (c = i << 24, j = 8; j > 0; --j)
+ c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
+ crc32_table[i] = c;
+ }
+ }
+
+ while (len--)
+ {
+ crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255];
+ buf++;
+ }
+ return crc;
+}
+
+/* compare-sections command
+
+ With no arguments, compares each loadable section in the exec bfd
+ with the same memory range on the target, and reports mismatches.
+ Useful for verifying the image on the target against the exec file.
+ Depends on the target understanding the new "qCRC:" request. */
+
+static void
+remote_compare_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ asection *s;
+ unsigned long host_crc, target_crc;
+ extern bfd *exec_bfd;
+ struct cleanup *old_chain;
+ char *tmp, *sectdata, *sectname, buf[PBUFSIZ];
+ bfd_size_type size;
+ bfd_vma lma;
+ int matched = 0;
+
+ if (!exec_bfd)
+ error ("command cannot be used without an exec file");
+ if (!current_target.to_shortname ||
+ strcmp (current_target.to_shortname, "remote") != 0)
+ error ("command can only be used with remote target");
+
+ for (s = exec_bfd->sections; s; s = s->next)
+ {
+ if (!(s->flags & SEC_LOAD))
+ continue; /* skip non-loadable section */
+
+ size = bfd_get_section_size_before_reloc (s);
+ if (size == 0)
+ continue; /* skip zero-length section */
+
+ sectname = (char *) bfd_get_section_name (exec_bfd, s);
+ if (args && strcmp (args, sectname) != 0)
+ continue; /* not the section selected by user */
+
+ matched = 1; /* do this section */
+ lma = s->lma;
+ /* FIXME: assumes lma can fit into long */
+ sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size);
+ putpkt (buf);
+
+ /* be clever; compute the host_crc before waiting for target reply */
+ sectdata = xmalloc (size);
+ old_chain = make_cleanup (free, sectdata);
+ bfd_get_section_contents (exec_bfd, s, sectdata, 0, size);
+ host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff);
+
+ getpkt (buf, 0);
+ if (buf[0] == 'E')
+ error ("target memory fault, section %s, range 0x%08x -- 0x%08x",
+ sectname, lma, lma + size);
+ if (buf[0] != 'C')
+ error ("remote target does not support this operation");
+
+ for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++)
+ target_crc = target_crc * 16 + fromhex (*tmp);
+
+ printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ",
+ sectname, lma, lma + size);
+ if (host_crc == target_crc)
+ printf_filtered ("matched.\n");
+ else
+ printf_filtered ("MIS-MATCHED!\n");
+
+ do_cleanups (old_chain);
+ }
+ if (args && !matched)
+ printf_filtered ("No loaded section named '%s'.\n", args);
+}
+
+
+void
+_initialize_remote ()
+{
+ init_remote_ops() ;
+ init_extended_remote_ops() ;
+ add_target (&remote_ops);
+ add_target (&extended_remote_ops);
+
+/* Remote target communications for serial-line targets in custom GDB protocol
+ Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996, 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. */
+
+/* Remote communication protocol.
+
+ A debug packet whose contents are <data>
+ is encapsulated for transmission in the form:
+
+ $ <data> # CSUM1 CSUM2
+
+ <data> must be ASCII alphanumeric and cannot include characters
+ '$' or '#'. If <data> starts with two characters followed by
+ ':', then the existing stubs interpret this as a sequence number.
+
+ CSUM1 and CSUM2 are ascii hex representation of an 8-bit
+ checksum of <data>, the most significant nibble is sent first.
+ the hex digits 0-9,a-f are used.
+
+ Receiver responds with:
+
+ + - if CSUM is correct and ready for next packet
+ - - if CSUM is incorrect
+
+ <data> is as follows:
+ Most values are encoded in ascii hex digits. Signal numbers are according
+ to the numbering in target.h.
+
+ Request Packet
+
+ set thread Hct... Set thread for subsequent operations.
+ c = 'c' for thread used in step and
+ continue; t... can be -1 for all
+ threads.
+ c = 'g' for thread used in other
+ operations. If zero, pick a thread,
+ any thread.
+ reply OK for success
+ ENN for an error.
+
+ read registers g
+ reply XX....X Each byte of register data
+ is described by two hex digits.
+ Registers are in the internal order
+ for GDB, and the bytes in a register
+ are in the same order the machine uses.
+ or ENN for an error.
+
+ write regs GXX..XX Each byte of register data
+ is described by two hex digits.
+ reply OK for success
+ ENN for an error
+
+ write reg Pn...=r... Write register n... with value r...,
+ which contains two hex digits for each
+ byte in the register (target byte
+ order).
+ reply OK for success
+ ENN for an error
+ (not supported by all stubs).
+
+ read mem mAA..AA,LLLL AA..AA is address, LLLL is length.
+ reply XX..XX XX..XX is mem contents
+ Can be fewer bytes than requested
+ if able to read only part of the data.
+ or ENN NN is errno
+
+ write mem MAA..AA,LLLL:XX..XX
+ AA..AA is address,
+ LLLL is number of bytes,
+ XX..XX is data
+ reply OK for success
+ ENN for an error (this includes the case
+ where only part of the data was
+ written).
+
+ continue cAA..AA AA..AA is address to resume
+ If AA..AA is omitted,
+ resume at same address.
+
+ step sAA..AA AA..AA is address to resume
+ If AA..AA is omitted,
+ resume at same address.
+
+ continue with Csig;AA..AA Continue with signal sig (hex signal
+ signal number). If ;AA..AA is omitted, resume
+ at same address.
+
+ step with Ssig;AA..AA Like 'C' but step not continue.
+ signal
+
+ last signal ? Reply the current reason for stopping.
+ This is the same reply as is generated
+ for step or cont : SAA where AA is the
+ signal number.
+
+ detach D Reply OK.
+
+ There is no immediate reply to step or cont.
+ The reply comes when the machine stops.
+ It is SAA AA is the signal number.
+
+ or... TAAn...:r...;n...:r...;n...:r...;
+ AA = signal number
+ n... = register number (hex)
+ r... = register contents
+ n... = `thread'
+ r... = thread process ID. This is
+ a hex integer.
+ n... = other string not starting
+ with valid hex digit.
+ gdb should ignore this n,r pair
+ and go on to the next. This way
+ we can extend the protocol.
+ or... WAA The process exited, and AA is
+ the exit status. This is only
+ applicable for certains sorts of
+ targets.
+ or... XAA The process terminated with signal
+ AA.
+ or... OXX..XX XX..XX is hex encoding of ASCII data. This
+ can happen at any time while the program is
+ running and the debugger should
+ continue to wait for 'W', 'T', etc.
+
+ thread alive TXX Find out if the thread XX is alive.
+ reply OK thread is still alive
+ ENN thread is dead
+
+ remote restart RXX Restart the remote server
+
+ extended ops ! Use the extended remote protocol.
+ Sticky -- only needs to be set once.
+
+ kill request k
+
+ toggle debug d toggle debug flag (see 386 & 68k stubs)
+ reset r reset -- see sparc stub.
+ reserved <other> On other requests, the stub should
+ ignore the request and send an empty
+ response ($#<checksum>). This way
+ we can extend the protocol and GDB
+ can tell whether the stub it is
+ talking to uses the old or the new.
+ search tAA:PP,MM Search backwards starting at address
+ AA for a match with pattern PP and
+ mask MM. PP and MM are 4 bytes.
+ Not supported by all stubs.
+
+ general query qXXXX Request info about XXXX.
+ general set QXXXX=yyyy Set value of XXXX to yyyy.
+ query sect offs qOffsets Get section offsets. Reply is
+ Text=xxx;Data=yyy;Bss=zzz
+
+ Responses can be run-length encoded to save space. A '*' means that
+ the next character is an ASCII encoding giving a repeat count which
+ stands for that many repititions of the character preceding the '*'.
+ The encoding is n+29, yielding a printable character where n >=3
+ (which is where rle starts to win). Don't use an n > 126.
+
+ So
+ "0* " means the same as "0000". */
+
+#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 "terminal.h"*/
+#include "gdbcmd.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "gdbthread.h"
+
+#include "dcache.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <signal.h>
+#include "serial.h"
+
+/* Prototypes for local functions */
+
+static int remote_write_bytes PARAMS ((CORE_ADDR memaddr,
+ char *myaddr, int len));
+
+static int remote_read_bytes PARAMS ((CORE_ADDR memaddr,
+ char *myaddr, int len));
+
+static void remote_files_info PARAMS ((struct target_ops *ignore));
+
+static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr,
+ int len, int should_write,
+ struct target_ops *target));
+
+static void remote_prepare_to_store PARAMS ((void));
+
+static void remote_fetch_registers PARAMS ((int regno));
+
+static void remote_resume PARAMS ((int pid, int step,
+ enum target_signal siggnal));
+
+static int remote_start_remote PARAMS ((char *dummy));
+
+static void remote_open PARAMS ((char *name, int from_tty));
+
+static void extended_remote_open PARAMS ((char *name, int from_tty));
+
+static void remote_open_1 PARAMS ((char *, int, struct target_ops *, int extended_p));
+
+static void remote_close PARAMS ((int quitting));
+
+static void remote_store_registers PARAMS ((int regno));
+
+static void remote_mourn PARAMS ((void));
+
+static void extended_remote_restart PARAMS ((void));
+
+static void extended_remote_mourn PARAMS ((void));
+
+static void extended_remote_create_inferior PARAMS ((char *, char *, char **));
+
+static void remote_mourn_1 PARAMS ((struct target_ops *));
+
+static void remote_send PARAMS ((char *buf));
+
+static int readchar PARAMS ((int timeout));
+
+static int remote_wait PARAMS ((int pid, struct target_waitstatus *status));
+
+static void remote_kill PARAMS ((void));
+
+static int tohex PARAMS ((int nib));
+
+static void remote_detach PARAMS ((char *args, int from_tty));
+
+static void remote_interrupt PARAMS ((int signo));
+
+static void remote_interrupt_twice PARAMS ((int signo));
+
+static void interrupt_query PARAMS ((void));
+
+static void set_thread PARAMS ((int, int));
+
+static int remote_thread_alive PARAMS ((int));
+
+static void get_offsets PARAMS ((void));
+
+static int read_frame PARAMS ((char *));
+
+static int remote_insert_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static int remote_remove_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static int hexnumlen PARAMS ((ULONGEST num));
+
+/* exported functions */
+
+extern int fromhex PARAMS ((int a));
+extern void getpkt PARAMS ((char *buf, int forever));
+extern int putpkt PARAMS ((char *buf));
+
+/* Define the target subroutine names */
+
+static struct target_ops remote_ops ;
+
+static void init_remote_ops(void)
+{
+ remote_ops.to_shortname = "remote";
+ remote_ops.to_longname = "Remote serial target in gdb-specific protocol";
+ remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya)." ;
+ remote_ops.to_open = remote_open;
+ remote_ops.to_close = remote_close;
+ remote_ops.to_attach = NULL;
+ remote_ops.to_detach = remote_detach;
+ remote_ops.to_resume = remote_resume;
+ remote_ops.to_wait = remote_wait;
+ remote_ops.to_fetch_registers = remote_fetch_registers;
+ remote_ops.to_store_registers = remote_store_registers;
+ remote_ops.to_prepare_to_store = remote_prepare_to_store;
+ remote_ops.to_xfer_memory = remote_xfer_memory;
+ remote_ops.to_files_info = remote_files_info;
+ remote_ops.to_insert_breakpoint = remote_insert_breakpoint;
+ remote_ops.to_remove_breakpoint = remote_remove_breakpoint;
+ remote_ops.to_terminal_init = NULL;
+ remote_ops.to_terminal_inferior = NULL;
+ remote_ops.to_terminal_ours_for_output = NULL;
+ remote_ops.to_terminal_ours = NULL;
+ remote_ops.to_terminal_info = NULL;
+ remote_ops.to_kill = remote_kill;
+ remote_ops.to_load = generic_load;
+ remote_ops.to_lookup_symbol = NULL;
+ remote_ops.to_create_inferior = NULL;
+ remote_ops.to_mourn_inferior = remote_mourn;
+ remote_ops.to_can_run = 0;
+ remote_ops.to_notice_signals = 0;
+ remote_ops.to_thread_alive = remote_thread_alive;
+ remote_ops.to_stop = 0;
+ remote_ops.to_stratum = process_stratum;
+ remote_ops.DONT_USE = NULL;
+ remote_ops.to_has_all_memory = 1;
+ remote_ops.to_has_memory = 1;
+ remote_ops.to_has_stack = 1;
+ remote_ops.to_has_registers = 1;
+ remote_ops.to_has_execution = 1;
+ remote_ops.to_sections = NULL;
+ remote_ops.to_sections_end = NULL;
+ remote_ops.to_magic = OPS_MAGIC ;
+} /* init_remote_ops */
+
+static struct target_ops extended_remote_ops ;
+
+static void init_extended_remote_ops(void)
+{
+ extended_remote_ops.to_shortname = "extended-remote";
+ extended_remote_ops.to_longname = "Extended remote serial target in gdb-specific protocol";
+ extended_remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya).",
+ extended_remote_ops.to_open = extended_remote_open;
+ extended_remote_ops.to_close = remote_close;
+ extended_remote_ops.to_attach = NULL;
+ extended_remote_ops.to_detach = remote_detach;
+ extended_remote_ops.to_resume = remote_resume;
+ extended_remote_ops.to_wait = remote_wait;
+ extended_remote_ops.to_fetch_registers = remote_fetch_registers;
+ extended_remote_ops.to_store_registers = remote_store_registers;
+ extended_remote_ops.to_prepare_to_store = remote_prepare_to_store;
+ extended_remote_ops.to_xfer_memory = remote_xfer_memory;
+ extended_remote_ops.to_files_info = remote_files_info;
+ extended_remote_ops.to_insert_breakpoint = remote_insert_breakpoint;
+ extended_remote_ops.to_remove_breakpoint = remote_remove_breakpoint;
+ extended_remote_ops.to_terminal_init = NULL;
+ extended_remote_ops.to_terminal_inferior = NULL;
+ extended_remote_ops.to_terminal_ours_for_output = NULL;
+ extended_remote_ops.to_terminal_ours = NULL;
+ extended_remote_ops.to_terminal_info = NULL;
+ extended_remote_ops.to_kill = remote_kill;
+ extended_remote_ops.to_load = generic_load;
+ extended_remote_ops.to_lookup_symbol = NULL;
+ extended_remote_ops.to_create_inferior = extended_remote_create_inferior;
+ extended_remote_ops.to_mourn_inferior = extended_remote_mourn;
+ extended_remote_ops.to_can_run = 0;
+ extended_remote_ops.to_notice_signals = 0;
+ extended_remote_ops.to_thread_alive = remote_thread_alive;
+ extended_remote_ops.to_stop = 0;
+ extended_remote_ops.to_stratum = process_stratum;
+ extended_remote_ops.DONT_USE = NULL;
+ extended_remote_ops.to_has_all_memory = 1;
+ extended_remote_ops.to_has_memory = 1;
+ extended_remote_ops.to_has_stack = 1;
+ extended_remote_ops.to_has_registers = 1;
+ extended_remote_ops.to_has_execution = 1;
+ extended_remote_ops.to_sections = NULL;
+ extended_remote_ops.to_sections_end = NULL;
+ extended_remote_ops.to_magic = OPS_MAGIC ;
+}
+
+
+/* This was 5 seconds, which is a long time to sit and wait.
+ Unless this is going though some terminal server or multiplexer or
+ other form of hairy serial connection, I would think 2 seconds would
+ be plenty. */
+
+/* Changed to allow option to set timeout value.
+ was static int remote_timeout = 2; */
+extern int remote_timeout;
+
+/* This variable chooses whether to send a ^C or a break when the user
+ requests program interruption. Although ^C is usually what remote
+ systems expect, and that is the default here, sometimes a break is
+ preferable instead. */
+
+static int remote_break;
+
+/* Descriptor for I/O to remote machine. Initialize it to NULL so that
+ remote_open knows that we don't have a file open when the program
+ starts. */
+static serial_t remote_desc = NULL;
+
+/* Having this larger than 400 causes us to be incompatible with m68k-stub.c
+ and i386-stub.c. Normally, no one would notice because it only matters
+ for writing large chunks of memory (e.g. in downloads). Also, this needs
+ to be more than 400 if required to hold the registers (see below, where
+ we round it up based on REGISTER_BYTES). */
+#define PBUFSIZ 400
+
+/* 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)
+
+/* Round up PBUFSIZ to hold all the registers, at least. */
+/* The blank line after the #if seems to be required to work around a
+ bug in HP's PA compiler. */
+#if REGISTER_BYTES > MAXBUFBYTES
+
+#undef PBUFSIZ
+#define PBUFSIZ (REGISTER_BYTES * 2 + 32)
+#endif
+
+/* This variable sets the number of bytes to be written to the target
+ in a single packet. Normally PBUFSIZ is satisfactory, but some
+ targets need smaller values (perhaps because the receiving end
+ is slow). */
+
+static int remote_write_size = PBUFSIZ;
+
+/* This is the size (in chars) of the first response to the `g' command. This
+ is used to limit the size of the memory read and write commands to prevent
+ stub buffers from overflowing. The size does not include headers and
+ trailers, it is only the payload size. */
+
+static int remote_register_buf_size = 0;
+
+/* Should we try the 'P' request? If this is set to one when the stub
+ doesn't support 'P', the only consequence is some unnecessary traffic. */
+static int stub_supports_P = 1;
+
+/* These are pointers to hook functions that may be set in order to
+ modify resume/wait behavior for a particular architecture. */
+
+void (*target_resume_hook) PARAMS ((void));
+void (*target_wait_loop_hook) PARAMS ((void));
+
+\f
+/* These are the threads which we last sent to the remote system. -1 for all
+ or -2 for not sent yet. */
+int general_thread;
+int cont_thread;
+
+static void
+set_thread (th, gen)
+ int th;
+ int gen;
+{
+ char buf[PBUFSIZ];
+ int state = gen ? general_thread : cont_thread;
+ if (state == th)
+ return;
+ buf[0] = 'H';
+ buf[1] = gen ? 'g' : 'c';
+ if (th == 42000)
+ {
+ buf[2] = '0';
+ buf[3] = '\0';
+ }
+ else if (th < 0)
+ sprintf (&buf[2], "-%x", -th);
+ else
+ sprintf (&buf[2], "%x", th);
+ putpkt (buf);
+ getpkt (buf, 0);
+ if (gen)
+ general_thread = th;
+ else
+ cont_thread = th;
+}
+\f
+/* Return nonzero if the thread TH is still alive on the remote system. */
+
+static int
+remote_thread_alive (th)
+ int th;
+{
+ char buf[PBUFSIZ];
+
+ buf[0] = 'T';
+ if (th < 0)
+ sprintf (&buf[1], "-%x", -th);
+ else
+ sprintf (&buf[1], "%x", th);
+ putpkt (buf);
+ getpkt (buf, 0);
+ return (buf[0] == 'O' && buf[1] == 'K');
+}
+
+/* Restart the remote side; this is an extended protocol operation. */
+
+static void
+extended_remote_restart ()
+{
+ char buf[PBUFSIZ];
+
+ /* Send the restart command; for reasons I don't understand the
+ remote side really expects a number after the "R". */
+ buf[0] = 'R';
+ sprintf (&buf[1], "%x", 0);
+ putpkt (buf);
+
+ /* Now query for status so this looks just like we restarted
+ gdbserver from scratch. */
+ putpkt ("?");
+ getpkt (buf, 0);
+}
+\f
+/* Clean up connection to a remote debugger. */
+
+/* ARGSUSED */
+static void
+remote_close (quitting)
+ int quitting;
+{
+ if (remote_desc)
+ SERIAL_CLOSE (remote_desc);
+ remote_desc = NULL;
+}
+
+/* Query the remote side for the text, data and bss offsets. */
+
+static void
+get_offsets ()
+{
+ char buf[PBUFSIZ], *ptr;
+ int lose;
+ CORE_ADDR text_addr, data_addr, bss_addr;
+ struct section_offsets *offs;
+
+ putpkt ("qOffsets");
+
+ getpkt (buf, 0);
+
+ if (buf[0] == '\000')
+ return; /* Return silently. Stub doesn't support this
+ command. */
+ if (buf[0] == 'E')
+ {
+ warning ("Remote failure reply: %s", buf);
+ return;
+ }
+
+ /* Pick up each field in turn. This used to be done with scanf, but
+ scanf will make trouble if CORE_ADDR size doesn't match
+ conversion directives correctly. The following code will work
+ with any size of CORE_ADDR. */
+ text_addr = data_addr = bss_addr = 0;
+ ptr = buf;
+ lose = 0;
+
+ if (strncmp (ptr, "Text=", 5) == 0)
+ {
+ ptr += 5;
+ /* Don't use strtol, could lose on big values. */
+ while (*ptr && *ptr != ';')
+ text_addr = (text_addr << 4) + fromhex (*ptr++);
+ }
+ else
+ lose = 1;
+
+ if (!lose && strncmp (ptr, ";Data=", 6) == 0)
+ {
+ ptr += 6;
+ while (*ptr && *ptr != ';')
+ data_addr = (data_addr << 4) + fromhex (*ptr++);
+ }
+ else
+ lose = 1;
+
+ if (!lose && strncmp (ptr, ";Bss=", 5) == 0)
+ {
+ ptr += 5;
+ while (*ptr && *ptr != ';')
+ bss_addr = (bss_addr << 4) + fromhex (*ptr++);
+ }
+ else
+ lose = 1;
+
+ if (lose)
+ error ("Malformed response to offset query, %s", buf);
+
+ if (symfile_objfile == NULL)
+ return;
+
+ offs = (struct section_offsets *) alloca (sizeof (struct section_offsets)
+ + symfile_objfile->num_sections
+ * sizeof (offs->offsets));
+ memcpy (offs, symfile_objfile->section_offsets,
+ sizeof (struct section_offsets)
+ + symfile_objfile->num_sections
+ * sizeof (offs->offsets));
+
+ ANOFFSET (offs, SECT_OFF_TEXT) = text_addr;
+
+ /* This is a temporary kludge to force data and bss to use the same offsets
+ because that's what nlmconv does now. The real solution requires changes
+ to the stub and remote.c that I don't have time to do right now. */
+
+ ANOFFSET (offs, SECT_OFF_DATA) = data_addr;
+ ANOFFSET (offs, SECT_OFF_BSS) = data_addr;
+
+ objfile_relocate (symfile_objfile, offs);
+}
+
+/* Stub for catch_errors. */
+
+static int
+remote_start_remote (dummy)
+ char *dummy;
+{
+ immediate_quit = 1; /* Allow user to interrupt it */
+
+ /* Ack any packet which the remote side has already sent. */
+ SERIAL_WRITE (remote_desc, "+", 1);
+
+ /* Let the stub know that we want it to return the thread. */
+ set_thread (-1, 0);
+
+ get_offsets (); /* Get text, data & bss offsets */
+
+ putpkt ("?"); /* initiate a query from remote machine */
+ 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 void
+remote_open (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ remote_open_1 (name, from_tty, &remote_ops, 0);
+}
+
+/* Open a connection to a remote debugger using the extended
+ remote gdb protocol. NAME is the filename used for communication. */
+
+static void
+extended_remote_open (name, from_tty)
+ char *name;
+ int from_tty;
+{
+ remote_open_1 (name, from_tty, &extended_remote_ops, 1/*extended_p*/);
+}
+
+/* Generic code for opening a connection to a remote target. */
+static DCACHE *remote_dcache;
+
+static void
+remote_open_1 (name, from_tty, target, extended_p)
+ char *name;
+ int from_tty;
+ struct target_ops *target;
+ int extended_p;
+{
+ 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 (target);
+
+ remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes);
+
+ remote_desc = SERIAL_OPEN (name);
+ if (!remote_desc)
+ perror_with_name (name);
+
+ if (baud_rate != -1)
+ {
+ if (SERIAL_SETBAUDRATE (remote_desc, baud_rate))
+ {
+ SERIAL_CLOSE (remote_desc);
+ perror_with_name (name);
+ }
+ }
+
+
+ SERIAL_RAW (remote_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 (remote_desc);
+
+ if (from_tty)
+ {
+ puts_filtered ("Remote debugging using ");
+ puts_filtered (name);
+ puts_filtered ("\n");
+ }
+ push_target (target); /* Switch to using remote target now */
+
+ /* Start out by trying the 'P' request to set registers. We set this each
+ time that we open a new target so that if the user switches from one
+ stub to another, we can (if the target is closed and reopened) cope. */
+ stub_supports_P = 1;
+
+ general_thread = -2;
+ cont_thread = -2;
+
+ /* Without this, some commands which require an active target (such as kill)
+ won't work. This variable serves (at least) double duty as both the pid
+ of the target process (if it has such), and as a flag indicating that a
+ target is active. These functions should be split out into seperate
+ variables, especially since GDB will someday have a notion of debugging
+ several processes. */
+ inferior_pid = 42000;
+ /* 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 (remote_start_remote, (char *)0,
+ "Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
+ {
+ pop_target();
+ return;
+ }
if (extended_p)
{
remote_open_1 (name, from_tty, target, extended_p);
}
+/* Table used by the crc32 function to calcuate the checksum. */
+static unsigned long crc32_table[256] = {0, 0};
+
+static unsigned long
+crc32 (buf, len, crc)
+ unsigned char *buf;
+ int len;
+ unsigned int crc;
+{
+ if (! crc32_table[1])
+ {
+ /* Initialize the CRC table and the decoding table. */
+ int i, j;
+ unsigned int c;
+
+ for (i = 0; i < 256; i++)
+ {
+ for (c = i << 24, j = 8; j > 0; --j)
+ c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
+ crc32_table[i] = c;
+ }
+ }
+
+ while (len--)
+ {
+ crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255];
+ buf++;
+ }
+ return crc;
+}
+
+/* compare-sections command
+
+ With no arguments, compares each loadable section in the exec bfd
+ with the same memory range on the target, and reports mismatches.
+ Useful for verifying the image on the target against the exec file.
+ Depends on the target understanding the new "qCRC:" request. */
+
+static void
+remote_compare_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ asection *s;
+ unsigned long host_crc, target_crc;
+ extern bfd *exec_bfd;
+ struct cleanup *old_chain;
+ char *tmp, *sectdata, *sectname, buf[PBUFSIZ];
+ bfd_size_type size;
+ bfd_vma lma;
+ int matched = 0;
+
+ if (!exec_bfd)
+ error ("command cannot be used without an exec file");
+ if (!current_target.to_shortname ||
+ strcmp (current_target.to_shortname, "remote") != 0)
+ error ("command can only be used with remote target");
+
+ for (s = exec_bfd->sections; s; s = s->next)
+ {
+ if (!(s->flags & SEC_LOAD))
+ continue; /* skip non-loadable section */
+
+ size = bfd_get_section_size_before_reloc (s);
+ if (size == 0)
+ continue; /* skip zero-length section */
+
+ sectname = (char *) bfd_get_section_name (exec_bfd, s);
+ if (args && strcmp (args, sectname) != 0)
+ continue; /* not the section selected by user */
+
+ matched = 1; /* do this section */
+ lma = s->lma;
+ /* FIXME: assumes lma can fit into long */
+ sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size);
+ putpkt (buf);
+
+ /* be clever; compute the host_crc before waiting for target reply */
+ sectdata = xmalloc (size);
+ old_chain = make_cleanup (free, sectdata);
+ bfd_get_section_contents (exec_bfd, s, sectdata, 0, size);
+ host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff);
+
+ getpkt (buf, 0);
+ if (buf[0] == 'E')
+ error ("target memory fault, section %s, range 0x%08x -- 0x%08x",
+ sectname, lma, lma + size);
+ if (buf[0] != 'C')
+ error ("remote target does not support this operation");
+
+ for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++)
+ target_crc = target_crc * 16 + fromhex (*tmp);
+
+ printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ",
+ sectname, lma, lma + size);
+ if (host_crc == target_crc)
+ printf_filtered ("matched.\n");
+ else
+ printf_filtered ("MIS-MATCHED!\n");
+
+ do_cleanups (old_chain);
+ }
+ if (args && !matched)
+ printf_filtered ("No loaded section named '%s'.\n", args);
+}
+
+/* reload command
+
+ With no arguments, compares each loadable section on the target
+ with the binary image in the current exec bfd. Sections that
+ are not identical are downloaded to the target. Depends on the
+ target understanding the "qCRC:" request.
+
+ Optionally accepts the name of a section as an argument, and
+ downloads that section; in this case no comparison is done --
+ the section is downloaded unconditionally. */
+
+static void
+remote_reload_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ asection *s;
+ unsigned long host_crc, target_crc;
+ extern bfd *exec_bfd;
+ struct cleanup *old_chain;
+ char *tmp, *sectdata, *sectname, buf[PBUFSIZ];
+ bfd_size_type size;
+ bfd_vma lma;
+ unsigned long sent, len, l;
+ int matched = 0;
+ int err;
+
+ if (!exec_bfd)
+ error ("command cannot be used without an exec file");
+
+ for (s = exec_bfd->sections; s; s = s->next)
+ {
+ if (!(s->flags & SEC_LOAD))
+ continue; /* skip non-loadable section */
+
+ size = bfd_get_section_size_before_reloc (s);
+ if (size == 0)
+ continue; /* skip zero-length section */
+
+ sectname = (char *) bfd_get_section_name (exec_bfd, s);
+ if (args && strcmp (args, sectname) != 0)
+ continue; /* not the section selected by user */
+
+ matched = 1; /* do this section */
+ lma = s->lma;
+ sectdata = xmalloc (size);
+ old_chain = make_cleanup (free, sectdata);
+ bfd_get_section_contents (exec_bfd, s, sectdata, 0, size);
+
+ if (args == 0)
+ {
+ /*
+ * Compare all sections, and reload those that don't match.
+ */
+
+ if (!current_target.to_shortname ||
+ strcmp (current_target.to_shortname, "remote") != 0)
+ error ("command can only be used with remote target");
+
+ /* FIXME: assumes lma can fit into long */
+ sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size);
+ putpkt (buf);
+
+ /* be clever; compute the host_crc before waiting for target reply */
+ host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff);
+
+ getpkt (buf, 0);
+ if (buf[0] == 'E')
+ error ("target memory fault, section %s, range 0x%08x -- 0x%08x",
+ sectname, lma, lma + size);
+ if (buf[0] != 'C')
+ error ("remote target does not support this operation");
+
+ for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++)
+ target_crc = target_crc * 16 + fromhex (*tmp);
+ }
+
+ printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ",
+ sectname, lma, lma + size);
+
+ if (args != 0 || /* section specified -- reload unconditionally */
+ host_crc != target_crc) /* section changed on target */
+ {
+ printf_filtered ("being reloaded now.\n");
+ l = size / 100;
+ l = l > 100 ? l : 100; /* chunk size; at least 100 */
+ sent = 0;
+ do
+ {
+ len = (size - sent) < l ? (size - sent) : l;
+ sent += len;
+ err = target_write_memory (lma, sectdata, len);
+ lma += len;
+ sectdata += len;
+ }
+ while (err == 0 && sent < size);
+ }
+ else
+ printf_filtered ("unchanged.\n");
+
+ do_cleanups (old_chain);
+ }
+ if (args && !matched)
+ printf_filtered ("No loaded section named '%s'.\n", args);
+}
void
_initialize_remote ()
add_target (&remote_ops);
add_target (&extended_remote_ops);
+ add_cmd ("compare-sections", class_obscure, remote_compare_command,
+ "Compare section data on remote target to the exec file.\n\
+Optional argument is a single section name (default: all loadable sections).",
+ &cmdlist);
+
add_show_from_set (add_set_cmd ("remotetimeout", no_class,
var_integer, (char *)&remote_timeout,
"Set timeout value for remote read.\n", &setlist),
projects / binutils-gdb.git / commitdiff