[ES40-developers] Patch: Backtrace fix

[Brian W. <bdw...@in...>]

This patch make a few changes to the backtrace functionality:

* adds the -rdynamic LD flag if DEBUG_BACKTRACE is specified.  This
allows all non-static function names to appear in the backtrace.  

* catch SIGUSR1 to trigger the backtracer if es40 seems to have hung.

* use _exit() to really really quit when a SIGSEGV is caught.


Index: Makefile
===================================================================
RCS file: /cvsroot/es40/es40/src/Makefile,v
retrieving revision 1.26
diff -u -w -r1.26 Makefile
--- Makefile    20 Feb 2008 21:02:50 -0000      1.26
+++ Makefile    21 Feb 2008 13:47:38 -0000
@@ -135,6 +135,7 @@
 #   -DDEBUG_PIC                    Turn on Programmable Interrupt Controller debugging
 #   -DDEBUG_LPT         Turn on debugging for LPT Port
 #   -DDEBUG_BACKTRACE   Turn on backtrace dump on SIGSEGV
+#   -DDEBUG_USB                Turn on debugging for USB controller
 #
 CDEBUGFLAGS = -g -DHIDE_COUNTER -DDEBUG_BACKTRACE
 
@@ -172,6 +173,11 @@
 LDOPTIONFLAGS += -g
 endif
 
+ifneq ($(findstring "-DDEBUG_BACKTRACE",$(CDEBUGFLAGS)),"")
+LDOPTIONFLAGS += -rdynamic
+endif
+
+
 CFLAGS =  -I. -I..  \
        $(CDEBUGFLAGS) $(CTUNINGFLAGS) $(OPTIONS) $(COPTIONFLAGS)
 LDFLAGS = $(LDOPTIONFLAGS)
@@ -265,4 +271,3 @@
        $(DEPEND) -o.do -a -- $(IDB_CFLAGS) -- $(SRCS)
 clean:
        rm -f es40 es40_idb es40_lss es40_lsm *.o *.do *.mao *.slo *.trc gui/*.o gui/*.mao gui/*.slo gui/*.do
-
Index: AlphaSim.cpp
===================================================================
RCS file: /cvsroot/es40/es40/src/AlphaSim.cpp,v
retrieving revision 1.40
diff -u -w -r1.40 AlphaSim.cpp
--- AlphaSim.cpp        7 Feb 2008 20:33:26 -0000       1.40
+++ AlphaSim.cpp        21 Feb 2008 13:47:38 -0000
@@ -211,7 +211,7 @@
     printf("%3d %s\n",nptrs-i, strings[i]);
   }
   free(strings);
-  exit(1);
+  if(signum==SIGSEGV) _exit(1);
 }
 
 #else
@@ -255,6 +255,7 @@
 
 #ifdef HAS_BACKTRACE
   signal(SIGSEGV, &segv_handler);
+  signal(SIGUSR1, &segv_handler);
 #endif
 
   try