$NetBSD: patch-bm,v 1.1.1.1 2003/04/29 09:22:28 thomasklausner Exp $

--- /dev/null	2003-04-28 12:43:56.000000000 +0100
+++ src/lib/machines/netbsd/80x86/tokens/except_toks.pl	1998-03-16 10:39:19.000000000 +0000
@@ -0,0 +1,125 @@
+/*
+    		 Crown Copyright (c) 1997
+    
+    This TenDRA(r) Computer Program is subject to Copyright
+    owned by the United Kingdom Secretary of State for Defence
+    acting through the Defence Evaluation and Research Agency
+    (DERA).  It is made available to Recipients with a
+    royalty-free licence for its use, reproduction, transfer
+    to other parties and amendment for any purpose not excluding
+    product development provided that any such use et cetera
+    shall be deemed to be acceptance of the following conditions:-
+    
+        (1) Its Recipients shall ensure that this Notice is
+        reproduced upon any copies or amended versions of it;
+    
+        (2) Any amended version of it shall be clearly marked to
+        show both the nature of and the organisation responsible
+        for the relevant amendment or amendments;
+    
+        (3) Its onward transfer from a recipient to another
+        party shall be deemed to be that party's acceptance of
+        these conditions;
+    
+        (4) DERA gives no warranty or assurance as to its
+        quality or suitability for any purpose and DERA accepts
+        no liability whatsoever in relation to any use to which
+        it may be put.
+*/
+	/* **************************************************** */
+	/*							*/
+	/*	Spec Token Definitions for trans386		*/
+	/*	Needs to be linked with posix library		*/
+	/*	specific to each platform.			*/
+	/*							*/
+	/* **************************************************** */
+
+
+Tokdec ~Throw : [NAT] EXP;
+
+Tokdec ansi.stdlib.abort : [] EXP;
+Tokdec ansi.signal.SIGFPE : [] EXP;
+Tokdec ansi.signal.SIGSEGV : [] EXP;
+Tokdec posix.signal.SIG_SETMASK : [] EXP;
+Tokdec posix.signal.sigaction : [EXP, EXP, EXP] EXP;
+Tokdec posix.signal.sigemptyset : [EXP] EXP;
+Tokdec posix.signal.sigset_t : [] SHAPE;
+Tokdec posix.signal.struct_sigaction : [] SHAPE;
+Tokdec posix.signal.sigaction.sa_handler : [] EXP;
+Tokdec posix.signal.sigaction.sa_mask : [] EXP;
+Tokdec posix.signal.sigaction.sa_flags : [] EXP;
+Tokdec posix.signal.sigprocmask : [EXP, EXP, EXP] EXP;
+
+
+Iddec __trans386_special : proc;	/* special interface to trans386 */
+
+Common __trans386_stack_limit : pointer (locals_alignment)
+		= make_null_ptr (locals_alignment);
+
+
+Common __trans386_errhandler : proc;
+	/* Initialised by ~Set_signal_handler */
+	/* called from numerical exception interrupt or from translated code */
+
+Var allsigs : posix.signal.sigset_t;
+
+
+Tokdef ~Set_signal_handler = [] EXP
+	/* must be called before any possible exceptions */
+
+Let ovhandler = Proc bottom (sig : Int)
+  {
+    __trans386_special [top](2(Int));	/* fclex to clear interrupt */
+    posix.signal.sigprocmask [posix.signal.SIG_SETMASK, allsigs,
+		make_null_ptr (alignment (posix.signal.sigset_t)) ];
+    (* __trans386_errhandler) [bottom] (+ error_val(overflow)(Int));
+  }
+
+Let nilaccess_handler = Proc bottom (sig : Int)
+  {
+    posix.signal.sigprocmask [posix.signal.SIG_SETMASK, allsigs,
+		make_null_ptr (alignment (posix.signal.sigset_t)) ];
+    (* __trans386_errhandler) [bottom] (+ error_val(nil_access)(Int));
+  }
+
+Let errhandler = Proc bottom (err : Int)
+{	/* called from numerical or nilaccess exception interrupt,
+	   or from translated code */
+  __trans386_special [top](1(Int));	/* finit for known state before ~Throw */
+  ?{	? (* err == + error_val(overflow)(Int));
+	~Throw[error_val(overflow)];
+	ansi.stdlib.abort ;
+  | ?{	? (* err == + error_val(stack_overflow)(Int));
+	~Throw[error_val(stack_overflow)];
+	ansi.stdlib.abort ;
+    |	~Throw[error_val(nil_access)];
+	ansi.stdlib.abort ;
+  } }
+}
+
+Var sigact : posix.signal.struct_sigaction
+
+{		/* main body of ~Set_signal_handler */
+  __trans386_errhandler = errhandler;
+  posix.signal.sigemptyset [allsigs];
+  posix.signal.sigemptyset [sigact *+. posix.signal.sigaction.sa_mask];
+  (sigact *+. posix.signal.sigaction.sa_flags) = 0(Int);
+  (sigact *+. posix.signal.sigaction.sa_handler) = ovhandler;
+  posix.signal.sigaction [ ansi.signal.SIGFPE, sigact, 
+		make_null_ptr (alignment (posix.signal.struct_sigaction)) ];
+  (sigact *+. posix.signal.sigaction.sa_handler) = nilaccess_handler;
+  posix.signal.sigaction [ ansi.signal.SIGSEGV, sigact, 
+		make_null_ptr (alignment (posix.signal.struct_sigaction)) ];
+  env_size (errhandler)
+};
+
+
+Tokdef ~Sync_handler = [] EXP
+	/* must be called prior to any action that modifies ~Trap handling */
+{
+  __trans386_special [top](0(Int));	/* fwait */
+};
+
+
+Keep (~Set_signal_handler, ~Sync_handler, 
+	__trans386_errhandler, __trans386_stack_limit)