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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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/* This is intended for Dec ULTRIX */
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Common __TDFhandler:proc;
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Common __mipshandler:proc;
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Common __TDFstacklim:pointer(locals_alignment);
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Tokdef SIGFPE = []SIGNED_NAT 8;
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Tokdef SIGBUS = []SIGNED_NAT 10;
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Tokdef SIGSEGV = []SIGNED_NAT 11;
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Tokdef SIGUSR1 = []SIGNED_NAT 30;
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/* signal numbers - SIGUSR1 is used for stack overflow
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*/
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Tokdec ansi.signal.signal: [EXP, EXP]EXP;
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Tokdec ansi.stdlib.exit: [EXP]EXP;
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Tokdec ~Throw:[NAT]EXP;
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/* This token must be defined to throw the language specific error
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value
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*/
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Struct sigcontext(sc_onstack:Int, sc_mask:Int,
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sc_pc:Int,
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sc_regs:nof(32,Int),
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sc_mdlo:Int,
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sc_mdhi:Int,
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sc_ownedfp:Int,
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sc_fpregs:nof(32,Int),
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sc_fpc_csr:Int, sc_fpc_eir:Int,
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sc_cause:Int,
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sc_badvaddr:Int
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);
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Tokdef SETREG = [scp:EXP, r:NAT, val:EXP]EXP
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{ ((scp *+. .sc_regs) *+.
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(Sizeof(Int) .* (+ r(Int)) ) ) = val };
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Tokdef CAUSE_BD = []SIGNED_NAT 16r80000000;
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Tokdef ~Set_signal_handler = [] EXP
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{
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/* This token must be called before any possible exceptions */
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Let mh = Proc top(sig:Int, code:Int, scp:Ptr sigcontext) {
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/* This procedure is obeyed at an automatic error trap, using signal.
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It's action calls __TDFhandler on top of the user stack by overwriting
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the relevant registers of the failing process and simply returning.
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Could have written this in C.
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*/
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(* scp *+. .sc_pc) = * __TDFhandler;
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/* the pc of the failing process */
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SETREG[* scp, 4, * sig];
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/* the first parameter */
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SETREG[* scp, 5, * code];
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/* the second parameter */
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SETREG[* scp, 25, * __TDFhandler];
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/* required for PIC code */
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Let x = *(Int)(* scp *+. .sc_cause)
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{ (* scp *+. .sc_cause) = (x And not(CAUSE_BD(Int)))
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/* the exception could have occurred in a delay slot
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- make sure the return does not treat it as one.
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*/
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};
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return(make_top)
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/* reinstates the failing process ie does a call of __TDFhandler */
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}
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{
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__mipshandler = mh;
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__TDFhandler = Proc top( sig:Int, code:Int)
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{
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/* This procedure may either be called via __mipshandler or else as a
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result of an explicit error test in the user program. It's action is to
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throw the language specific error coding.
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*/
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Labelled {
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Case * sig (SIGFPE -> overf,
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SIGBUS -> nilref1,
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SIGSEGV -> nilref2,
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SIGUSR1 -> stackov)
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| :overf:
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ansi.signal.signal[SIGFPE(Int), * __mipshandler];
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~Throw[error_val(overflow)]
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| :nilref1:
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ansi.signal.signal[SIGBUS(Int), * __mipshandler];
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~Throw[error_val(nil_access)]
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| :nilref2:
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ansi.signal.signal[SIGSEGV(Int), * __mipshandler];
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~Throw[error_val(nil_access)]
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| :stackov:
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ansi.signal.signal[SIGUSR1(Int), * __mipshandler];
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~Throw[error_val(stack_overflow)]
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/* other C signals can be treated similarly */
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};
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ansi.stdlib.exit[* sig];
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return(make_top);
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};
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ansi.signal.signal[SIGFPE(Int), * __mipshandler];
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ansi.signal.signal[SIGBUS(Int), * __mipshandler];
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ansi.signal.signal[SIGSEGV(Int), * __mipshandler];
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ansi.signal.signal[SIGUSR1(Int), * __mipshandler];
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env_size(mh) .+. (Sizeof(Char) .* 1000(Int))
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}
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};
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Tokdef ~Sync_handler = [] EXP make_top;
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Keep (~Set_signal_handler, __TDFhandler, ~Sync_handler, __TDFstacklim)
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