/* Remote target communications for serial-line targets in custom GDB protocol
- Copyright 1988, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
+ Copyright 1988, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of GDB.
- - if CSUM is incorrect
<data> is as follows:
- All values are encoded in ascii hex digits.
+ 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.
where only part of the data was
written).
- cont cAA..AA AA..AA is address to resume
+ continue cAA..AA AA..AA is address to resume
If AA..AA is omitted,
resume at same address.
If AA..AA is omitted,
resume at same address.
+ continue with Csig;AA Continue with signal sig (hex signal
+ signal number).
+
+ step with Ssig;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
There is no immediate reply to step or cont.
The reply comes when the machine stops.
- It is SAA AA is the "signal number"
+ It is SAA AA is the signal number.
- or... TAAn...:r...;n:r...;n...:r...;
+ or... TAAn...:r...;n...:r...;n...:r...;
AA = signal number
- n... = register number
- r... = register contents
+ 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... Otext Send text to stdout. This can happen
+ at any time while the program is
+ running and the debugger should
+ continue to wait for 'W', 'T', etc.
+
kill request k
toggle debug d toggle debug flag (see 386 & 68k stubs)
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
- console output Otext Send text to stdout. Only comes from
- remote target.
Responses can be run-length encoded to save space. A '*' means that
the next character is an ASCII encoding giving a repeat count which
#include "gdbcmd.h"
#include "objfiles.h"
#include "gdb-stabs.h"
+#include "thread.h"
#include "dcache.h"
/* Prototypes for local functions */
-static int
-remote_write_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len));
+static int remote_write_bytes PARAMS ((CORE_ADDR memaddr,
+ char *myaddr, int len));
-static int
-remote_read_bytes PARAMS ((CORE_ADDR memaddr, unsigned 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 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 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_prepare_to_store PARAMS ((void));
-static void
-remote_fetch_registers PARAMS ((int regno));
+static void remote_fetch_registers PARAMS ((int regno));
-static void
-remote_resume PARAMS ((int pid, int step, enum target_signal siggnal));
+static void remote_resume PARAMS ((int pid, int step,
+ enum target_signal siggnal));
-static int
-remote_start_remote PARAMS ((char *dummy));
+static int remote_start_remote PARAMS ((char *dummy));
-static void
-remote_open PARAMS ((char *name, int from_tty));
+static void remote_open PARAMS ((char *name, int from_tty));
-static void
-remote_close PARAMS ((int quitting));
+static void remote_close PARAMS ((int quitting));
-static void
-remote_store_registers PARAMS ((int regno));
+static void remote_store_registers PARAMS ((int regno));
-static void
-getpkt PARAMS ((char *buf, int forever));
+static void getpkt PARAMS ((char *buf, int forever));
-static void
-putpkt PARAMS ((char *buf));
+static int putpkt PARAMS ((char *buf));
-static void
-remote_send PARAMS ((char *buf));
+static void remote_send PARAMS ((char *buf));
-static int
-readchar PARAMS ((int timeout));
+static int readchar PARAMS ((int timeout));
static int remote_wait PARAMS ((int pid, struct target_waitstatus *status));
-static int
-tohex PARAMS ((int nib));
+static void remote_kill PARAMS ((void));
-static int
-fromhex PARAMS ((int a));
+static int tohex PARAMS ((int nib));
-static void
-remote_detach PARAMS ((char *args, int from_tty));
+static int fromhex PARAMS ((int a));
-static void
-remote_interrupt PARAMS ((int signo));
+static void remote_detach PARAMS ((char *args, int from_tty));
-static void
-remote_interrupt_twice PARAMS ((int signo));
+static void remote_interrupt PARAMS ((int signo));
-static void
-interrupt_query PARAMS ((void));
+static void remote_interrupt_twice PARAMS ((int signo));
+
+static void interrupt_query PARAMS ((void));
extern struct target_ops remote_ops; /* Forward decl */
Unless this is going though some terminal server or multiplexer or
other form of hairy serial connection, I would think 2 seconds would
be plenty. */
-static int remote_timeout = 2;
-#if 0
-int icache;
-#endif
+static int remote_timeout = 2;
/* 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
doesn't support 'P', the only consequence is some unnecessary traffic. */
static int stub_supports_P = 1;
+\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');
+}
\f
/* Clean up connection to a remote debugger. */
+ symfile_objfile->num_sections
* sizeof (offs->offsets));
- /* FIXME: This code assumes gdb-stabs.h is being used; it's broken
- for xcoff, dwarf, sdb-coff, etc. But there is no simple
- canonical representation for this stuff. (Just what does "text"
- as seen by the stub mean, anyway? I think it means all sections
- with SEC_CODE set, but we currently have no way to deal with that). */
-
ANOFFSET (offs, SECT_OFF_TEXT) = text_addr;
/* This is a temporary kludge to force data and bss to use the same offsets
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;
}
int from_tty;
{
if (name == 0)
- error (
-"To open a remote debug connection, you need to specify what serial\n\
+ 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);
}
}
+
SERIAL_RAW (remote_desc);
/* If there is something sitting in the buffer we might take it as a
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
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))
+ "Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
pop_target();
}
\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;
{
char buf[PBUFSIZ];
- if (siggnal)
- {
- target_terminal_ours_for_output ();
- printf_filtered
- ("Can't send signals to a remote system. %s not sent.\n",
- target_signal_to_name (siggnal));
- target_terminal_inferior ();
- }
+ if (pid == -1)
+ set_thread (inferior_pid, 0);
+ else
+ set_thread (pid, 0);
dcache_flush (remote_dcache);
- strcpy (buf, step ? "s": "c");
+ last_sent_signal = siggnal;
+ last_sent_step = step;
+
+ 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);
}
target_terminal_inferior ();
}
+/* If nonzero, ignore the next kill. */
+int kill_kludge;
+
/* Wait until the remote machine stops, then return,
storing status in STATUS just as `wait' would.
Returns "pid" (though it's not clear what, if anything, that
struct target_waitstatus *status;
{
unsigned char buf[PBUFSIZ];
+ int thread_num = -1;
status->kind = TARGET_WAITKIND_EXITED;
status->value.integer = 0;
while (*p)
{
unsigned char *p1;
+ char *p_temp;
- regno = strtol (p, &p1, 16); /* Read the register number */
+ regno = strtol (p, &p_temp, 16); /* Read the register number */
+ p1 = (unsigned char *)p_temp;
if (p1 == p)
- warning ("Remote sent badly formed register number: %s\nPacket: '%s'\n",
- p1, buf);
-
- p = p1;
-
- if (*p++ != ':')
- warning ("Malformed packet (missing colon): %s\nPacket: '%s'\n",
- p, buf);
-
- if (regno >= NUM_REGS)
- warning ("Remote sent bad register number %d: %s\nPacket: '%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;
+ p1 = (unsigned char *) strchr (p, ':');
+ if (p1 == NULL)
+ warning ("Malformed packet (missing colon): %s\n\
+Packet: '%s'\n",
+ p, buf);
+ if (strncmp (p, "thread", p1 - p) == 0)
+ {
+ thread_num = strtol (++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 %d: %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);
-
- supply_register (regno, regs);
}
}
/* fall through */
status->value.sig = (enum target_signal)
(((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
- return inferior_pid;
+ 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]);
- return inferior_pid;
+ 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 */
fputs_filtered ((char *)(buf + 1), gdb_stdout);
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 (buf, last_sent_step ? "s" : "c");
+ putpkt (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. */
char *p;
char regs[REGISTER_BYTES];
+ set_thread (inferior_pid, 1);
+
sprintf (buf, "g");
remote_send (buf);
int i;
char *p;
+ set_thread (inferior_pid, 1);
+
if (regno >= 0 && stub_supports_P)
{
/* Try storing a single register. */
remote_send (buf);
}
-#if 0
-
-/* Use of the data cache is disabled because it loses for looking at
+/*
+ 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, but a better way which would
- win for more cases would be to use the executable file for the text
- segment, like the `icache' code below but done cleanly (in some
- target-independent place, perhaps in target_xfer_memory, perhaps
- based on assigning each target a speed or perhaps by some simpler
- mechanism). */
+ 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. */
remote_fetch_word (addr)
CORE_ADDR addr;
{
-#if 0
- if (icache)
- {
- extern CORE_ADDR text_start, text_end;
-
- if (addr >= text_start && addr < text_end)
- {
- int buffer;
- xfer_core_file (addr, &buffer, sizeof (int));
- return buffer;
- }
- }
-#endif
return dcache_fetch (remote_dcache, addr);
}
{
dcache_poke (remote_dcache, addr, word);
}
-#endif /* 0 */
+
\f
/* Write memory data directly to the remote machine.
This does not inform the data cache; the data cache uses this.
static int
remote_write_bytes (memaddr, myaddr, len)
CORE_ADDR memaddr;
- unsigned char *myaddr;
+ char *myaddr;
int len;
{
char buf[PBUFSIZ];
static int
remote_read_bytes (memaddr, myaddr, len)
CORE_ADDR memaddr;
- unsigned char *myaddr;
+ char *myaddr;
int len;
{
char buf[PBUFSIZ];
int should_write;
struct target_ops *target; /* ignored */
{
- int xfersize;
- int bytes_xferred;
- int total_xferred = 0;
-
- while (len > 0)
- {
- if (len > MAXBUFBYTES)
- xfersize = MAXBUFBYTES;
- else
- xfersize = len;
-
- if (should_write)
- bytes_xferred = remote_write_bytes (memaddr,
- (unsigned char *)myaddr, xfersize);
- else
- bytes_xferred = remote_read_bytes (memaddr,
- (unsigned char *)myaddr, xfersize);
-
- /* If we get an error, we are done xferring. */
- if (bytes_xferred == 0)
- break;
-
- memaddr += bytes_xferred;
- myaddr += bytes_xferred;
- len -= bytes_xferred;
- total_xferred += bytes_xferred;
- }
- return total_xferred;
+ return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write);
}
+
#if 0
/* Enable after 4.12. */
remote_send (buf)
char *buf;
{
-
putpkt (buf);
getpkt (buf, 0);
/* Send a packet to the remote machine, with error checking.
The data of the packet is in BUF. */
-static void
+static int
putpkt (buf)
char *buf;
{
char buf2[PBUFSIZ];
int cnt = strlen (buf);
int ch;
+ int tcount = 0;
char *p;
/* Copy the packet into buffer BUF2, encapsulating it
{
ch = readchar (remote_timeout);
- if (remote_debug)
+ if (remote_debug)
{
switch (ch)
{
case '$':
if (started_error_output)
{
- putc_unfiltered ('\n');
+ putchar_unfiltered ('\n');
started_error_output = 0;
}
}
case '+':
if (remote_debug)
printf_unfiltered("Ack\n");
- return;
+ return 1;
case SERIAL_TIMEOUT:
+ tcount ++;
+ if (tcount > 3)
+ return 0;
break; /* Retransmit buffer */
case '$':
{
started_error_output = 1;
printf_unfiltered ("putpkt: Junk: ");
}
- putc_unfiltered (ch & 0177);
+ putchar_unfiltered (ch & 0177);
}
continue;
}
int timeout;
int val;
+ strcpy (buf,"timeout");
+
if (forever)
- timeout = -1;
+ {
+#ifdef MAINTENANCE_CMDS
+ timeout = watchdog > 0 ? watchdog : -1;
+#else
+ timeout = -1;
+#endif
+ }
+
else
timeout = remote_timeout;
-#define MAX_TRIES 10
+#define MAX_TRIES 3
for (tries = 1; tries <= MAX_TRIES; tries++)
{
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;
}
/* Try the whole thing again. */
-retry:
+ retry:
SERIAL_WRITE (remote_desc, "-", 1);
}
static void
remote_kill ()
{
- putpkt ("k");
+ /* 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 ();
remote_mourn, /* to_mourn_inferior */
0, /* to_can_run */
0, /* to_notice_signals */
+ remote_thread_alive, /* to_thread_alive */
0, /* to_stop */
process_stratum, /* to_stratum */
NULL, /* to_next */
projects / deliverable / binutils-gdb.git / blobdiff