[Qemu-devel] [PATCH] gdbstub.c fix for SIGINT

[Jason Wessel]

Attached is a patch to add the case for interrupting the gdbstub and 
sending the correct signal to gdb.

The gdb serial protocol states that if you interrupt the stub with a 
"control-c" in gdb that it should stop with S02 (SIGINT) to indicate 
that it was interrupted.   I also added the tlb flush so that 
breakpoints can be written in correctly.  I found that if I ran a 
pentium qemu instance and broke in with gdb and planted a breakpoint at 
do_fork() that it was not immediately hit due to the lack of the 
flush.   With the patch, it reliably stops all the time now when a 
breakpoint is planted after interrupting the stub.

Thanks,
Jason.

Index: Changelog
===================================================================
RCS file: /sources/qemu/qemu/Changelog,v
retrieving revision 1.111
diff -u -r1.111 Changelog
--- Changelog   12 Apr 2006 21:09:31 -0000      1.111
+++ Changelog   17 Apr 2006 13:05:57 -0000
@@ -2,6 +2,7 @@
 
   - USB tablet support (Brad Campbell, Anthony Liguori)
   - win32 host serial support (Kazu)
+  - Fix SIGINT handler for gdbstub
 
 version 0.8.0:
 
Index: gdbstub.c
===================================================================
RCS file: /sources/qemu/qemu/gdbstub.c,v
retrieving revision 1.34
diff -u -r1.34 gdbstub.c
--- gdbstub.c   5 Dec 2005 19:55:19 -0000       1.34
+++ gdbstub.c   17 Apr 2006 13:05:57 -0000
@@ -654,6 +654,9 @@
     if (reason == EXCP_DEBUG) {
        tb_flush(s->env);
         ret = SIGTRAP;
+    } else if (reason == EXCP_INTERRUPT) {
+        tb_flush(s->env);
+        ret = SIGINT;
     }
     else
         ret = 0;