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/*
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Crown Copyright (c) 1997
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This TenDRA(r) Computer Program is subject to Copyright
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owned by the United Kingdom Secretary of State for Defence
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acting through the Defence Evaluation and Research Agency
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(DERA). It is made available to Recipients with a
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royalty-free licence for its use, reproduction, transfer
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to other parties and amendment for any purpose not excluding
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product development provided that any such use et cetera
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shall be deemed to be acceptance of the following conditions:-
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(1) Its Recipients shall ensure that this Notice is
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reproduced upon any copies or amended versions of it;
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(2) Any amended version of it shall be clearly marked to
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show both the nature of and the organisation responsible
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for the relevant amendment or amendments;
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(3) Its onward transfer from a recipient to another
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party shall be deemed to be that party's acceptance of
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these conditions;
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(4) DERA gives no warranty or assurance as to its
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quality or suitability for any purpose and DERA accepts
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no liability whatsoever in relation to any use to which
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it may be put.
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*/
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/*
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Exception tokens for sparctrans
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*/
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Common __sparc_stack_limit : pointer (locals_alignment) =
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make_null_ptr(locals_alignment);
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Common __sparc_errhandler : proc; /* initialised by ~Set_signal_handler */
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Tokdec ~Throw: [NAT] EXP;
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Tokdec ansi.stdlib.abort : [] EXP;
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Tokdec ansi.signal.SIGFPE : [] EXP;
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Tokdec ansi.signal.SIGSEGV : [] EXP;
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Tokdec posix.signal.SIGUSR1 : [] EXP;
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Tokdec posix.signal.SIG_SETMASK : [] EXP;
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Tokdec posix.signal.sigaction : [EXP, EXP, EXP] EXP;
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Tokdec posix.signal.sigemptyset : [EXP] EXP;
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Tokdec posix.signal.sigset_t : [] SHAPE;
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Tokdec posix.signal.struct_sigaction : [] SHAPE;
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Tokdec posix.signal.sigaction.sa_handler : [] EXP;
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Tokdec posix.signal.sigaction.sa_mask : [] EXP;
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Tokdec posix.signal.sigaction.sa_flags : [] EXP;
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Tokdec posix.signal.sigprocmask : [EXP, EXP, EXP] EXP;
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/*
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Sync handler delays subsequent processing until any pending
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exceptions have been raised
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*/
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Tokdec ~Sync_handler : [] EXP;
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Var allsigs : posix.signal.sigset_t;
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/*
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Called before any use of error treatment
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Sets up each of the signal handlers
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*/
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Tokdef ~Set_signal_handler = [] EXP
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Let ovhandler = Proc bottom (sig : Int)
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{
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posix.signal.sigprocmask [posix.signal.SIG_SETMASK, allsigs,
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make_null_ptr (alignment (posix.signal.sigset_t)) ];
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(* __sparc_errhandler) [bottom] (+ error_val(overflow)(Int));
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}
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Let nil_access_handler = Proc bottom (sig : Int){
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posix.signal.sigprocmask [posix.signal.SIG_SETMASK, allsigs,
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make_null_ptr (alignment (posix.signal.sigset_t)) ];
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(* __sparc_errhandler) [bottom] (+ error_val(nil_access)(Int));
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}
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Let errhandler = Proc bottom (err : Int)
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{ /* called from numerical exception interrupt or from translated code */
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?{ ? (* err == + error_val(overflow)(Int));
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~Throw[error_val(overflow)];
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ansi.stdlib.abort ;
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| ?{ ? (* err == + error_val(stack_overflow)(Int));
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~Throw[error_val(stack_overflow)];
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ansi.stdlib.abort ;
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| ~Throw[error_val(nil_access)];
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ansi.stdlib.abort ;
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} }
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}
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Var sigact : posix.signal.struct_sigaction
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{
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__sparc_errhandler = errhandler;
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posix.signal.sigemptyset [allsigs];
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(sigact *+. posix.signal.sigaction.sa_handler) = ovhandler;
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posix.signal.sigemptyset [sigact *+. posix.signal.sigaction.sa_mask];
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(sigact *+. posix.signal.sigaction.sa_flags) = 0(Int);
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posix.signal.sigaction [ ansi.signal.SIGFPE, sigact,
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make_null_ptr (alignment (posix.signal.struct_sigaction)) ];
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(sigact *+. posix.signal.sigaction.sa_handler) = nil_access_handler;
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posix.signal.sigaction [ansi.signal.SIGSEGV,sigact,
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make_null_ptr(alignment(posix.signal.struct_sigaction)) ];
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env_size (errhandler)
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};
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Keep (~Set_signal_handler, ~Sync_handler, __sparc_errhandler,
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__sparc_stack_limit)
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