/* Remote target communications for serial-line targets in custom GDB protocol
- Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
+ Copyright 1988, 91, 92, 93, 94, 95, 96, 97, 1998
+ Free Software Foundation, Inc.
This file is part of GDB.
If AA..AA is omitted,
resume at same address.
- continue with Csig;AA Continue with signal sig (hex signal
- signal number).
+ 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 Like 'C' but step not continue.
+ step with Ssig;AA..AA Like 'C' but step not continue.
signal
last signal ? Reply the current reason for stopping.
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.
#include "gdbcmd.h"
#include "objfiles.h"
#include "gdb-stabs.h"
-#include "thread.h"
+#include "gdbthread.h"
#include "dcache.h"
static void extended_remote_open PARAMS ((char *name, int from_tty));
-static void remote_open_1 PARAMS ((char *, int, struct target_ops *));
+static void remote_open_1 PARAMS ((char *, int, struct target_ops *, int extended_p));
static void remote_close PARAMS ((int quitting));
static void remote_mourn_1 PARAMS ((struct target_ops *));
-static void getpkt PARAMS ((char *buf, int forever));
-
-static int putpkt PARAMS ((char *buf));
-
static void remote_send PARAMS ((char *buf));
static int readchar PARAMS ((int timeout));
static int tohex PARAMS ((int nib));
-static int fromhex PARAMS ((int a));
-
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));
-extern struct target_ops remote_ops; /* Forward decl */
-extern struct target_ops extended_remote_ops; /* Forward decl */
+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));
+
+static void init_remote_ops PARAMS ((void));
+
+static void init_extended_remote_ops PARAMS ((void));
+
+static void remote_stop PARAMS ((void));
+
+static int hexnumstr PARAMS ((char *, ULONGEST));
+
+static CORE_ADDR remote_address_masked PARAMS ((CORE_ADDR));
+
+static void print_packet PARAMS ((char *));
+
+static unsigned long crc32 PARAMS ((unsigned char *, int, unsigned int));
+
+static void compare_sections_command PARAMS ((char *, int));
+
+static void packet_command PARAMS ((char *, int));
+
+/* exported functions */
+
+extern int fromhex PARAMS ((int a));
+
+extern void getpkt PARAMS ((char *buf, int forever));
+
+extern int putpkt PARAMS ((char *buf));
+
+void remote_console_output PARAMS ((char *));
+
+void open_remote_target PARAMS ((char *, int, struct target_ops *, int));
+
+void _initialize_remote PARAMS ((void));
+
+/* */
+
+static struct target_ops remote_ops;
+
+static struct target_ops extended_remote_ops;
/* This was 5 seconds, which is a long time to sit and wait.
Unless this is going though some terminal server or multiplexer or
other form of hairy serial connection, I would think 2 seconds would
be plenty. */
-static int remote_timeout = 2;
+/* 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;
+
+/* Has the user attempted to interrupt the target? If so, then offer
+ the user the opportunity to bail out completely if he interrupts
+ again. */
+static int interrupted_already = 0;
/* 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. */
-serial_t remote_desc = NULL;
+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
#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 variable sets the number of bits in an address that are to be
+ sent in a memory ("M" or "m") packet. Normally, after stripping
+ leading zeros, the entire address would be sent. This variable
+ restricts the address to REMOTE_ADDRESS_SIZE bits. HISTORY: The
+ initial implementation of remote.c restricted the address sent in
+ memory packets to ``host::sizeof long'' bytes - (typically 32
+ bits). Consequently, for 64 bit targets, the upper 32 bits of an
+ address was never sent. Since fixing this bug may cause a break in
+ some remote targets this variable is principly provided to
+ facilitate backward compatibility. */
+
+static int remote_address_size;
+
+/* 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. */
static void
get_offsets ()
{
- char buf[PBUFSIZ];
- int nvals;
+ char buf[PBUFSIZ], *ptr;
+ int lose;
CORE_ADDR text_addr, data_addr, bss_addr;
struct section_offsets *offs;
return;
}
- nvals = sscanf (buf, "Text=%lx;Data=%lx;Bss=%lx", &text_addr, &data_addr,
- &bss_addr);
- if (nvals != 3)
+ /* 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)
char *name;
int from_tty;
{
- remote_open_1 (name, from_tty, &remote_ops);
+ remote_open_1 (name, from_tty, &remote_ops, 0);
}
/* Open a connection to a remote debugger using the extended
- remote gdb protocol. NAME is hte filename used for communication. */
+ remote gdb protocol. NAME is the filename used for communication. */
static void
extended_remote_open (name, from_tty)
char *name;
int from_tty;
{
- char buf[PBUFSIZ];
-
- /* Do the basic remote open stuff. */
- remote_open_1 (name, from_tty, &extended_remote_ops);
-
- /* Now tell the remote that we're using the extended protocol. */
- putpkt ("!");
- getpkt (buf, 0);
-
+ 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)
+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\
(we'd be in an inconsistent state otherwise). */
if (!catch_errors (remote_start_remote, (char *)0,
"Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
- pop_target();
+ {
+ pop_target();
+ return;
+ }
+
+ if (extended_p)
+ {
+ /* tell the remote that we're using the extended protocol. */
+ char buf[PBUFSIZ];
+ putpkt ("!");
+ getpkt (buf, 0);
+ }
}
-/* remote_detach()
- takes a program previously attached to and detaches it.
- We better not have left any breakpoints
- in the program or it'll die when it hits one.
- Close the open connection to the remote debugger.
- Use this when you want to detach and do something else
- with your gdb. */
+/* 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. */
-static int
+int
fromhex (a)
int a;
{
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);
}
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';
\f
/* Send ^C to target to halt it. Target will respond, and send us a
packet. */
+static void (*ofunc) PARAMS ((int));
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");
-
- SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */
+ remote_stop ();
+ signal (signo, remote_interrupt);
}
-
-static void (*ofunc)();
-
-/* The user typed ^C twice. */
+
static void
-remote_interrupt_twice (signo)
- int signo;
+remote_stop ()
{
- signal (signo, ofunc);
-
- interrupt_query ();
+ if (!interrupted_already)
+ {
+ /* Send a break or a ^C, depending on user preference. */
+ interrupted_already = 1;
- signal (signo, remote_interrupt);
+ if (remote_debug)
+ printf_unfiltered ("remote_stop called\n");
+
+ if (remote_break)
+ SERIAL_SEND_BREAK (remote_desc);
+ else
+ SERIAL_WRITE (remote_desc, "\003", 1);
+ }
+ else
+ {
+ signal (SIGINT, ofunc);
+ interrupt_query ();
+ signal (SIGINT, remote_interrupt);
+ interrupted_already = 0;
+ }
}
/* Ask the user what to do when an interrupt is received. */
/* 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
{
unsigned char *p;
- ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
+ interrupted_already = 0;
+ ofunc = 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 */
n... = register number
r... = register contents
*/
-
p = &buf[3]; /* after Txx */
while (*p)
goto got_status;
case 'O': /* Console output */
- for (p = buf + 1; *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);
- }
+ remote_console_output (buf + 1);
continue;
case '\0':
if (last_sent_signal != TARGET_SIGNAL_0)
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);
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'))
+ && (buf[0] < 'a' || buf[0] > 'f')
+ && buf[0] != 'x') /* New: unavailable register value */
{
if (remote_debug)
printf_unfiltered ("Bad register packet; fetching a new packet\n");
print a second warning. */
goto supply_them;
}
- regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ if (p[0] == 'x' && p[1] == 'x')
+ regs[i] = 0; /* 'x' */
+ else
+ regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
p += 2;
}
warning ("Remote reply is too short: %s", buf);
#endif
}
-
- supply_them:
+
+ supply_them:
for (i = 0; i < NUM_REGS; i++)
+ {
supply_register (i, ®s[REGISTER_BYTE(i)]);
+ if (buf[REGISTER_BYTE(i) * 2] == 'x')
+ register_valid[i] = -1; /* register value not available */
+ }
}
/* Prepare to store registers. Since we may send them all (using a
#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);
+}
+
+/* Set BUF to the hex digits representing NUM */
+
+static int
+hexnumstr (buf, num)
+ char *buf;
+ ULONGEST num;
+{
+ int i;
+ int len = hexnumlen (num);
+
+ buf[len] = '\0';
+
+ for (i = len - 1; i >= 0; i--)
+ {
+ buf[i] = "0123456789abcdef" [(num & 0xf)];
+ num >>= 4;
+ }
+
+ return len;
+}
+
+/* Mask all but the least significant REMOTE_ADDRESS_SIZE bits */
+
+static CORE_ADDR
+remote_address_masked (addr)
+ CORE_ADDR addr;
+{
+ if (remote_address_size > 0
+ && remote_address_size < (sizeof (ULONGEST) * 8))
+ {
+ /* Only create a mask when that mask can safely be constructed
+ in a ULONGEST variable. */
+ ULONGEST mask = 1;
+ mask = (mask << remote_address_size) - 1;
+ addr &= mask;
+ }
+ return addr;
+}
+
/* 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.
char *myaddr;
int len;
{
- char buf[PBUFSIZ];
- int i;
- char *p;
- int done;
+ int max_buf_size; /* Max size of packet output buffer */
+ int origlen;
+
/* Chop the transfer down if necessary */
- done = 0;
- while (done < len)
+ 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)
{
- int todo = len - done;
- int cando = PBUFSIZ /2 - 32; /* number of bytes that will fit. */
- if (todo > cando)
- todo = cando;
+ char buf[PBUFSIZ];
+ char *p;
+ int todo;
+ int i;
- /* 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 + done, todo);
+ todo = min (len, max_buf_size / 2); /* num bytes that will fit */
+
+ /* construct "M"<memaddr>","<len>":" */
+ /* sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo); */
+ memaddr = remote_address_masked (memaddr);
+ p = buf;
+ *p++ = 'M';
+ p += hexnumstr (p, (ULONGEST) memaddr);
+ *p++ = ',';
+ p += hexnumstr (p, (ULONGEST) todo);
+ *p++ = ':';
+ *p = '\0';
/* 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 + done] >> 4) & 0xf);
- *p++ = tohex (myaddr[i + done] & 0xf);
+ *p++ = tohex ((myaddr[i] >> 4) & 0xf);
+ *p++ = tohex (myaddr[i] & 0xf);
}
*p = '\0';
errno = EIO;
return 0;
}
- done += todo;
+ myaddr += todo;
+ memaddr += todo;
+ len -= todo;
}
- return len;
+ return origlen;
}
/* Read memory data directly from the remote machine.
char *myaddr;
int len;
{
- char buf[PBUFSIZ];
- int i;
- char *p;
- int done;
- /* Chop transfer down if neccessary */
+ int max_buf_size; /* Max size of packet output buffer */
+ int origlen;
-#if 0
- /* FIXME: This is wrong for larger packets */
- if (len > PBUFSIZ / 2 - 1)
- abort ();
-#endif
- done = 0;
- while (done < len)
+ /* 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)
{
- int todo = len - done;
- int cando = PBUFSIZ / 2 - 32; /* number of bytes that will fit. */
- if (todo > cando)
- todo = cando;
-
- /* 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);
+ char buf[PBUFSIZ];
+ char *p;
+ int todo;
+ int i;
+
+ todo = min (len, max_buf_size / 2); /* num bytes that will fit */
+
+ /* construct "m"<memaddr>","<len>" */
+ /* sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo); */
+ memaddr = remote_address_masked (memaddr);
+ p = buf;
+ *p++ = 'm';
+ p += hexnumstr (p, (ULONGEST) memaddr);
+ *p++ = ',';
+ p += hexnumstr (p, (ULONGEST) todo);
+ *p = '\0';
+
putpkt (buf);
getpkt (buf, 0);
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. */
- break;
- myaddr[i + done] = fromhex (p[0]) * 16 + fromhex (p[1]);
+ return i + (origlen - len);
+ myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
p += 2;
}
- done += todo;
+ myaddr += todo;
+ memaddr += todo;
+ len -= todo;
}
- return len;
+ return origlen;
}
\f
/* Read or write LEN bytes from inferior memory at MEMADDR, transferring
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);
}
error ("Remote failure reply: %s", buf);
}
+/* Display a null-terminated packet on stdout, for debugging, using C
+ string notation. */
+
+static void
+print_packet (buf)
+ 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. */
-static int
+int
putpkt (buf)
char *buf;
{
/* Copy the packet into buffer BUF2, encapsulating it
and giving it a checksum. */
- if (cnt > sizeof(buf2) - 5) /* Prosanity check */
+ if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */
abort();
p = buf2;
If FOREVER, wait forever rather than timing out; this is used
while the target is executing user code. */
-static void
+void
getpkt (buf, forever)
char *buf;
int forever;
if (val == 1)
{
if (remote_debug)
- fprintf_unfiltered (gdb_stderr, "Packet received: %s\n", buf);
+ fprintf_unfiltered (gdb_stdout, "Packet received: %s\n", buf);
SERIAL_WRITE (remote_desc, "+", 1);
return;
}
}
\f
-#ifdef REMOTE_BREAKPOINT
-
/* On some machines, e.g. 68k, we may use a different breakpoint instruction
- than other targets. */
-static unsigned char break_insn[] = REMOTE_BREAKPOINT;
+ 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
-#else /* No 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
-/* Same old breakpoint instruction. This code does nothing different
- than mem-break.c. */
-static unsigned char break_insn[] = BREAKPOINT;
+static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT;
+static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT;
-#endif /* No 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,
CORE_ADDR addr;
char *contents_cache;
{
+#ifdef REMOTE_BREAKPOINT
int val;
- val = target_read_memory (addr, contents_cache, sizeof break_insn);
+ val = target_read_memory (addr, contents_cache, sizeof big_break_insn);
if (val == 0)
- val = target_write_memory (addr, (char *)break_insn, sizeof break_insn);
+ {
+ 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
CORE_ADDR addr;
char *contents_cache;
{
- return target_write_memory (addr, contents_cache, sizeof break_insn);
+#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 */
}
-\f
-/* Define the target subroutine names */
-
-struct target_ops remote_ops = {
- "remote", /* to_shortname */
- "Remote serial target in gdb-specific protocol", /* to_longname */
- "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).", /* to_doc */
- remote_open, /* to_open */
- remote_close, /* to_close */
- NULL, /* to_attach */
- remote_detach, /* to_detach */
- remote_resume, /* to_resume */
- remote_wait, /* to_wait */
- remote_fetch_registers, /* to_fetch_registers */
- remote_store_registers, /* to_store_registers */
- remote_prepare_to_store, /* to_prepare_to_store */
- remote_xfer_memory, /* to_xfer_memory */
- remote_files_info, /* to_files_info */
-
- remote_insert_breakpoint, /* to_insert_breakpoint */
- remote_remove_breakpoint, /* to_remove_breakpoint */
-
- NULL, /* to_terminal_init */
- NULL, /* to_terminal_inferior */
- NULL, /* to_terminal_ours_for_output */
- NULL, /* to_terminal_ours */
- NULL, /* to_terminal_info */
- remote_kill, /* to_kill */
- generic_load, /* to_load */
- NULL, /* to_lookup_symbol */
- NULL, /* to_create_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 */
- 1, /* to_has_all_memory */
- 1, /* to_has_memory */
- 1, /* to_has_stack */
- 1, /* to_has_registers */
- 1, /* to_has_execution */
- NULL, /* sections */
- NULL, /* sections_end */
- OPS_MAGIC /* to_magic */
-};
-
-struct target_ops extended_remote_ops = {
- "extended-remote", /* to_shortname */
- "Extended remote serial target in gdb-specific protocol",/* to_longname */
- "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).", /* to_doc */
- extended_remote_open, /* to_open */
- remote_close, /* to_close */
- NULL, /* to_attach */
- remote_detach, /* to_detach */
- remote_resume, /* to_resume */
- remote_wait, /* to_wait */
- remote_fetch_registers, /* to_fetch_registers */
- remote_store_registers, /* to_store_registers */
- remote_prepare_to_store, /* to_prepare_to_store */
- remote_xfer_memory, /* to_xfer_memory */
- remote_files_info, /* to_files_info */
-
- remote_insert_breakpoint, /* to_insert_breakpoint */
- remote_remove_breakpoint, /* to_remove_breakpoint */
-
- NULL, /* to_terminal_init */
- NULL, /* to_terminal_inferior */
- NULL, /* to_terminal_ours_for_output */
- NULL, /* to_terminal_ours */
- NULL, /* to_terminal_info */
- remote_kill, /* to_kill */
- generic_load, /* to_load */
- NULL, /* to_lookup_symbol */
- extended_remote_create_inferior,/* to_create_inferior */
- extended_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 */
- 1, /* to_has_all_memory */
- 1, /* to_has_memory */
- 1, /* to_has_stack */
- 1, /* to_has_registers */
- 1, /* to_has_execution */
- NULL, /* sections */
- NULL, /* sections_end */
- OPS_MAGIC /* to_magic */
-};
+
+/* 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
+compare_sections_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;
+ int mismatched = 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");
+ 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);
+}
+
+static void
+packet_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ char buf[PBUFSIZ];
+
+ if (! remote_desc)
+ error ("command can only be used with remote target");
+
+ if (! args)
+ error ("remote-packet command requires packet text as argument");
+
+ puts_filtered ("sending: ");
+ print_packet (args);
+ puts_filtered ("\n");
+ putpkt (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_stop = remote_stop;
+ 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 ();
add_target (&remote_ops);
+
+ init_extended_remote_ops ();
add_target (&extended_remote_ops);
+ 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.",
+ &maintenancelist);
+
add_show_from_set (add_set_cmd ("remotetimeout", no_class,
var_integer, (char *)&remote_timeout,
"Set timeout value for remote read.\n", &setlist),
&showlist);
+
+ add_show_from_set (add_set_cmd ("remotebreak", no_class,
+ var_integer, (char *)&remote_break,
+ "Set whether to send break if interrupted.\n", &setlist),
+ &showlist);
+
+ add_show_from_set (add_set_cmd ("remotewritesize", no_class,
+ var_integer, (char *)&remote_write_size,
+ "Set the maximum number of bytes in each memory write packet.\n", &setlist),
+ &showlist);
+
+ remote_address_size = TARGET_PTR_BIT;
+ add_show_from_set (add_set_cmd ("remoteaddresssize", class_obscure,
+ var_integer, (char *)&remote_address_size,
+ "Set the maximum size of the address (in bits) in a memory packet.\n", &setlist),
+ &showlist);
}
projects / deliverable / binutils-gdb.git / blobdiff