/* Remote target communications for serial-line targets in custom GDB protocol
- Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
+ Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of GDB.
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);
-}
-
-/* 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 void init_remote_ops PARAMS ((void));
-static int hexnumlen PARAMS ((ULONGEST num));
+static void init_extended_remote_ops PARAMS ((void));
/* exported functions */
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
error ("Remote failure reply: %s", buf);
}
+/* Display a null-terminated packet on stdout, for debugging, using C
+ string notation. */
+static void
+print_packet (char *buf)
+{
+ puts_filtered ("\"");
+ while (*buf)
+ gdb_printchar (*buf++, gdb_stdout, '"');
+ puts_filtered ("\"");
+}
+
+
/* Send a packet to the remote machine, with error checking.
The data of the packet is in 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)
+compare_sections_command (args, from_tty)
char *args;
int from_tty;
{
bfd_size_type size;
bfd_vma lma;
int matched = 0;
+ int mismatched = 0;
if (!exec_bfd)
error ("command cannot be used without an exec file");
if (host_crc == target_crc)
printf_filtered ("matched.\n");
else
+ {
printf_filtered ("MIS-MATCHED!\n");
+ mismatched++;
+ }
do_cleanups (old_chain);
}
+ if (mismatched > 0)
+ warning ("One or more sections of the remote executable does not match\nthe loaded file\n");
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)
+packet_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);
+{
+ char buf[PBUFSIZ];
- 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);
- }
+ if (!current_target.to_shortname ||
+ strcmp (current_target.to_shortname, "remote") != 0)
+ error ("command can only be used with remote target");
- printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ",
- sectname, lma, lma + size);
+ if (! args)
+ error ("remote-packet command requires packet text as argument");
- 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");
+ puts_filtered ("sending: ");
+ print_packet (args);
+ puts_filtered ("\n");
+ putpkt (args);
- do_cleanups (old_chain);
- }
- if (args && !matched)
- printf_filtered ("No loaded section named '%s'.\n", args);
-}
+ getpkt (buf, 0);
+ puts_filtered ("received: ");
+ print_packet (buf);
+ puts_filtered ("\n");
+}
+
+static void
+init_remote_ops ()
+{
+ 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_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_kill = remote_kill;
+ remote_ops.to_load = generic_load;
+ remote_ops.to_mourn_inferior = remote_mourn;
+ remote_ops.to_thread_alive = remote_thread_alive;
+ remote_ops.to_stratum = process_stratum;
+ 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_magic = OPS_MAGIC;
+}
+
+static void
+init_extended_remote_ops ()
+{
+ extended_remote_ops = remote_ops;
+
+ 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_create_inferior = extended_remote_create_inferior;
+ extended_remote_ops.to_mourn_inferior = extended_remote_mourn;
+}
void
_initialize_remote ()
{
- init_remote_ops() ;
- init_extended_remote_ops() ;
+ init_remote_ops ();
add_target (&remote_ops);
+
+ init_extended_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).",
+ add_cmd ("compare-sections", class_obscure, compare_sections_command,
+ "Compare section data on target to the exec file.\n\
+Argument is a single section name (default: all loaded sections).",
&cmdlist);
+ add_cmd ("packet", class_maintenance, packet_command,
+ "Send an arbitrary packet to a remote target.\n\
+ maintenance packet TEXT\n\
+If GDB is talking to an inferior via the GDB serial protocol, then\n\
+this command sends the string TEXT to the inferior, and displays the\n\
+response packet. GDB supplies the initial `$' character, and the\n\
+terminating `#' character and checksum. This command was originally\n\
+provided for use by the gdb.emc test suite.",
+ &maintenancelist);
+
add_show_from_set (add_set_cmd ("remotetimeout", no_class,
var_integer, (char *)&remote_timeout,
"Set timeout value for remote read.\n", &setlist),
"Set the maximum number of bytes in each memory write packet.\n", &setlist),
&showlist);
}
+
+
+
+
+
+
+
+
+
+
+
+
+
projects / deliverable / binutils-gdb.git / blobdiff