# define INVALID_DESCRIPTOR -1
#endif
+/* Extra value for readchar_callback. */
+enum {
+ /* The callback is currently not scheduled. */
+ NOT_SCHEDULED = -1
+};
+
+/* Status of the readchar callback.
+ Either NOT_SCHEDULED or the callback id. */
+static int readchar_callback = NOT_SCHEDULED;
+
static int readchar (void);
+static void reset_readchar (void);
+static void reschedule (void);
/* A cache entry for a successfully looked-up symbol. */
struct sym_cache
#endif
listen_desc = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (listen_desc < 0)
+ if (listen_desc == -1)
perror_with_name ("Can't open socket");
/* Allow rapid reuse of this port. */
close (remote_desc);
#endif
remote_desc = INVALID_DESCRIPTOR;
+
+ reset_readchar ();
}
/* Convert hex digit A to a number. */
unblock_async_io ();
}
+/* Internal buffer used by readchar.
+ These are global to readchar because reschedule_remote needs to be
+ able to tell whether the buffer is empty. */
+
+static unsigned char readchar_buf[BUFSIZ];
+static int readchar_bufcnt = 0;
+static unsigned char *readchar_bufp;
+
/* Returns next char from remote GDB. -1 if error. */
static int
readchar (void)
{
- static unsigned char buf[BUFSIZ];
- static int bufcnt = 0;
- static unsigned char *bufp;
+ int ch;
- if (bufcnt-- > 0)
- return *bufp++;
+ if (readchar_bufcnt == 0)
+ {
+ readchar_bufcnt = read (remote_desc, readchar_buf, sizeof (readchar_buf));
- bufcnt = read (remote_desc, buf, sizeof (buf));
+ if (readchar_bufcnt <= 0)
+ {
+ if (readchar_bufcnt == 0)
+ fprintf (stderr, "readchar: Got EOF\n");
+ else
+ perror ("readchar");
- if (bufcnt <= 0)
- {
- if (bufcnt == 0)
- fprintf (stderr, "readchar: Got EOF\n");
- else
- perror ("readchar");
+ return -1;
+ }
- return -1;
+ readchar_bufp = readchar_buf;
+ }
+
+ readchar_bufcnt--;
+ ch = *readchar_bufp++;
+ reschedule ();
+ return ch;
+}
+
+/* Reset the readchar state machine. */
+
+static void
+reset_readchar (void)
+{
+ readchar_bufcnt = 0;
+ if (readchar_callback != NOT_SCHEDULED)
+ {
+ delete_callback_event (readchar_callback);
+ readchar_callback = NOT_SCHEDULED;
}
+}
+
+/* Process remaining data in readchar_buf. */
+
+static int
+process_remaining (void *context)
+{
+ int res;
- bufp = buf;
- bufcnt--;
- return *bufp++;
+ /* This is a one-shot event. */
+ readchar_callback = NOT_SCHEDULED;
+
+ if (readchar_bufcnt > 0)
+ res = handle_serial_event (0, NULL);
+ else
+ res = 0;
+
+ return res;
+}
+
+/* If there is still data in the buffer, queue another event to process it,
+ we can't sleep in select yet. */
+
+static void
+reschedule (void)
+{
+ if (readchar_bufcnt > 0 && readchar_callback == NOT_SCHEDULED)
+ readchar_callback = append_callback_event (process_remaining, NULL);
}
/* Read a packet from the remote machine, with error checking,
}
void
-convert_int_to_ascii (unsigned char *from, char *to, int n)
+convert_int_to_ascii (const unsigned char *from, char *to, int n)
{
int nib;
int ch;
void
-convert_ascii_to_int (char *from, unsigned char *to, int n)
+convert_ascii_to_int (const char *from, unsigned char *to, int n)
{
int nib1, nib2;
while (n--)
void
decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr,
- unsigned char *to)
+ unsigned char **to_p)
{
int i = 0;
char ch;
*len_ptr |= fromhex (ch) & 0x0f;
}
- convert_ascii_to_int (&from[i++], to, *len_ptr);
+ if (*to_p == NULL)
+ *to_p = xmalloc (*len_ptr);
+
+ convert_ascii_to_int (&from[i++], *to_p, *len_ptr);
}
int
decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr,
- unsigned int *len_ptr, unsigned char *to)
+ unsigned int *len_ptr, unsigned char **to_p)
{
int i = 0;
char ch;
*len_ptr |= fromhex (ch) & 0x0f;
}
+ if (*to_p == NULL)
+ *to_p = xmalloc (*len_ptr);
+
if (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i,
- to, *len_ptr) != *len_ptr)
+ *to_p, *len_ptr) != *len_ptr)
return -1;
return 0;
*symcache_p = NULL;
}
-/* Ask GDB for the address of NAME, and return it in ADDRP if found.
+/* Get the address of NAME, and return it in ADDRP if found. if
+ MAY_ASK_GDB is false, assume symbol cache misses are failures.
Returns 1 if the symbol is found, 0 if it is not, -1 on error. */
int
-look_up_one_symbol (const char *name, CORE_ADDR *addrp)
+look_up_one_symbol (const char *name, CORE_ADDR *addrp, int may_ask_gdb)
{
char own_buf[266], *p, *q;
int len;
return 1;
}
- /* If we've passed the call to thread_db_look_up_symbols, then
- anything not in the cache must not exist; we're not interested
- in any libraries loaded after that point, only in symbols in
- libpthread.so. It might not be an appropriate time to look
- up a symbol, e.g. while we're trying to fetch registers. */
- if (proc->all_symbols_looked_up)
+ /* It might not be an appropriate time to look up a symbol,
+ e.g. while we're trying to fetch registers. */
+ if (!may_ask_gdb)
return 0;
/* Send the request. */
return 1;
}
+/* Relocate an instruction to execute at a different address. OLDLOC
+ is the address in the inferior memory where the instruction to
+ relocate is currently at. On input, TO points to the destination
+ where we want the instruction to be copied (and possibly adjusted)
+ to. On output, it points to one past the end of the resulting
+ instruction(s). The effect of executing the instruction at TO
+ shall be the same as if executing it at FROM. For example, call
+ instructions that implicitly push the return address on the stack
+ should be adjusted to return to the instruction after OLDLOC;
+ relative branches, and other PC-relative instructions need the
+ offset adjusted; etc. Returns 0 on success, -1 on failure. */
+
+int
+relocate_instruction (CORE_ADDR *to, CORE_ADDR oldloc)
+{
+ char own_buf[266];
+ int len;
+ ULONGEST written = 0;
+
+ /* Send the request. */
+ strcpy (own_buf, "qRelocInsn:");
+ sprintf (own_buf, "qRelocInsn:%s;%s", paddress (oldloc),
+ paddress (*to));
+ if (putpkt (own_buf) < 0)
+ return -1;
+
+ /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
+ len = getpkt (own_buf);
+ if (len < 0)
+ return -1;
+
+ /* We ought to handle pretty much any packet at this point while we
+ wait for the qRelocInsn "response". That requires re-entering
+ the main loop. For now, this is an adequate approximation; allow
+ GDB to access memory. */
+ while (own_buf[0] == 'm' || own_buf[0] == 'M' || own_buf[0] == 'X')
+ {
+ CORE_ADDR mem_addr;
+ unsigned char *mem_buf = NULL;
+ unsigned int mem_len;
+
+ if (own_buf[0] == 'm')
+ {
+ decode_m_packet (&own_buf[1], &mem_addr, &mem_len);
+ mem_buf = xmalloc (mem_len);
+ if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0)
+ convert_int_to_ascii (mem_buf, own_buf, mem_len);
+ else
+ write_enn (own_buf);
+ }
+ else if (own_buf[0] == 'X')
+ {
+ if (decode_X_packet (&own_buf[1], len - 1, &mem_addr,
+ &mem_len, &mem_buf) < 0
+ || write_inferior_memory (mem_addr, mem_buf, mem_len) != 0)
+ write_enn (own_buf);
+ else
+ write_ok (own_buf);
+ }
+ else
+ {
+ decode_M_packet (&own_buf[1], &mem_addr, &mem_len, &mem_buf);
+ if (write_inferior_memory (mem_addr, mem_buf, mem_len) == 0)
+ write_ok (own_buf);
+ else
+ write_enn (own_buf);
+ }
+ free (mem_buf);
+ if (putpkt (own_buf) < 0)
+ return -1;
+ len = getpkt (own_buf);
+ if (len < 0)
+ return -1;
+ }
+
+ if (own_buf[0] == 'E')
+ {
+ warning ("An error occurred while relocating an instruction: %s\n",
+ own_buf);
+ return -1;
+ }
+
+ if (strncmp (own_buf, "qRelocInsn:", strlen ("qRelocInsn:")) != 0)
+ {
+ warning ("Malformed response to qRelocInsn, ignoring: %s\n",
+ own_buf);
+ return -1;
+ }
+
+ unpack_varlen_hex (own_buf + strlen ("qRelocInsn:"), &written);
+
+ *to += written;
+ return 0;
+}
+
void
monitor_output (const char *msg)
{
projects / deliverable / binutils-gdb.git / blobdiff