signal hander patch

[Andrew Haley]

I don't have a PPC system convenient, so please try this ASAP.

Andrew.

2002-03-26  Andrew Haley  <aph@cambridge.redhat.com>

        (INIT_SEGV, INIT_FPE): Only use __libc_sigaction instead of
        syscall on IA-64 systems.

Index: include/dwarf2-signal.h
===================================================================
RCS file: /cvs/gcc/gcc/libjava/include/dwarf2-signal.h,v
retrieving revision 1.3.20.1
diff -c -2 -p -r1.3.20.1 dwarf2-signal.h
*** dwarf2-signal.h	2002/03/26 03:28:00	1.3.20.1
--- dwarf2-signal.h	2002/03/26 13:58:22
*************** while (0)
*** 69,72 ****
--- 69,107 ----
  #endif
  
+ #ifndef __ia64__
+ #define INIT_SEGV						\
+ do								\
+   {								\
+     nullp = new java::lang::NullPointerException ();    	\
+     struct sigaction act;					\
+     act.sa_sigaction = _Jv_catch_segv;      			\
+     sigemptyset (&act.sa_mask);					\
+     act.sa_flags = SA_SIGINFO;	       				\
+     syscall (SYS_sigaction, SIGSEGV, &act, NULL);		\
+   }								\
+ while (0)  
+ 
+ #define INIT_FPE						\
+ do								\
+   { 								\
+     arithexception = new java::lang::ArithmeticException 	\
+       (JvNewStringLatin1 ("/ by zero"));			\
+     struct sigaction act;					\
+     act.sa_sigaction = _Jv_catch_fpe;				\
+     sigemptyset (&act.sa_mask);					\
+     act.sa_flags = SA_SIGINFO;		       			\
+     syscall (SYS_sigaction, SIGFPE, &act, NULL);		\
+   }								\
+ while (0)  
+ 
+ /* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
+  * sigaction() because on some systems the pthreads wrappers for
+  * signal handlers are not compiled with unwind information, so it's
+  * not possible to unwind through them.  This is a problem that will
+  * go away once all systems have pthreads libraries that are
+  * compiled with full unwind info.  */
+ 
+ #else  /* __ia64__ */
+ 
  // FIXME: We shouldn't be using libc_sigaction here, since it should
  // be glibc private.  But using syscall here would mean translating to
*************** do								\
*** 103,113 ****
    }								\
  while (0)  
! 
! /* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
!  * sigaction() because on some systems the pthreads wrappers for
!  * signal handlers are not compiled with unwind information, so it's
!  * not possible to unwind through them.  This is a problem that will
!  * go away once all systems have pthreads libraries that are
!  * compiled with full unwind info.  */
! 
  #endif /* JAVA_SIGNAL_H */
--- 138,141 ----
    }								\
  while (0)  
! #endif /* __ia64__ */
  #endif /* JAVA_SIGNAL_H */