gdbserver: Add mechanism to prevent sending T stop packets

[deliverable/binutils-gdb.git] / gdbserver / remote-utils.cc

diff --git a/gdbserver/remote-utils.cc b/gdbserver/remote-utils.cc
index 6b547493a71a91ab02318fa8ad475c0387a26d04..1c211e2572096eae4df94a37e22f54672f87f981 100644 (file)
--- a/gdbserver/remote-utils.cc
+++ b/gdbserver/remote-utils.cc
@@ -1204,6 +1204,26 @@ prepare_resume_reply (char *buf, ptid_t ptid,
        else
          sprintf (buf, "T%02x", status->value.sig);
 
+       if (disable_packet_T)
+         {
+           /* This is a bit (OK, a lot) of a kludge, however, this isn't
+              really a user feature, but exists only so GDB can use the
+              gdbserver to test handling of the 'S' stop reply packet, so
+              we would rather this code be as simple as possible.
+
+              By this point we've started to build the 'T' stop packet,
+              and it should look like 'Txx....' where 'x' is a hex digit.
+              An 'S' stop packet always looks like 'Sxx', so all we do
+              here is convert the buffer from a T packet to an S packet
+              and the avoid adding any extra content by breaking out.  */
+           gdb_assert (*buf == 'T');
+           gdb_assert (isxdigit (*(buf + 1)));
+           gdb_assert (isxdigit (*(buf + 2)));
+           *buf = 'S';
+           *(buf + 3) = '\0';
+           break;
+         }
+
        buf += strlen (buf);
 
        saved_thread = current_thread;