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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 module gives the MIPS specific error handling, using C signals
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where possible. Particular language implementations must provide
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definitions of the tokens Throw and Convert_stndard_error as well as
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ensuring that SET_SIGNAL_HANDLER is called before any possible
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exceptions. MAKE_STACK_LIMIT[n] makes a limit of the stack.
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*/
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Iddec signal:proc;
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Iddec exit:proc;
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Iddec __mipshandler:proc;
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Tokdec Throw:[EXP]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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Tokdec Convert_standard_error: [NAT]EXP;
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/* This token must be defined to convert TDF ERROR_CODEs to their
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language specific error values */
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Var __TDFstacklim:pointer(alignment(Char));
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/* will contain the stack limit set up by set_stack_limit */
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Tokdec SIGFPE:[]SIGNED_NAT;
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Tokdec SIGBUS:[]SIGNED_NAT;
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Tokdec SIGSEGV:[]SIGNED_NAT;
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Tokdec SIGUSR1:[]SIGNED_NAT;
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/* Standard C signal numbers - SIGUSR1 is used for stack overflow
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*/
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Proc __TDFhandler = 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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NB. there always must be enough space to run it on the stack - the offset
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of this space can be found by env_size(__TDFhandler)
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*/
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Labelled {
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Case * sig (SIGFPE -> overf, SIGBUS -> nilref1, SIGSEGV -> nilref2,
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SIGUSR1 -> stackov)
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| :overf:
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signal[top](SIGFPE(Int), __mipshandler);
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Throw[Convert_standard_error[error_val(overflow)]]
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| :nilref1:
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signal[top](SIGBUS(Int), __mipshandler);
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Throw[Convert_standard_error[error_val(nil_access)]]
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| :nilref2:
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signal[top](SIGSEGV(Int), __mipshandler);
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Throw[Convert_standard_error[error_val(nil_access)]]
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| :stackov:
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signal[top](SIGUSR1(Int), __mipshandler);
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Throw[Convert_standard_error[error_val(stack_overflow)]]
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/* other C signals can be treated similarly */
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};
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exit[bottom](* sig)
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};
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Tokdef MAKE_STACK_LIMIT = [s:EXP]EXP
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/* sets the stack limit to be s bytes on top of current stack */
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make_stack_limit(current_env,
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env_size(__TDFhandler) .+. s,
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offset_zero(alloca_alignment));
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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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signal[top](SIGFPE(Int), __mipshandler);
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signal[top](SIGBUS(Int), __mipshandler);
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signal[top](SIGSEGV(Int), __mipshandler);
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signal[top](SIGUSR1(Int), __mipshandler);
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};
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Keep(__TDFhandler, SET_SIGNAL_HANDLER, __TDFstacklim, MAKE_STACK_LIMIT )
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