V3/usr/man/man2/ilgins.2

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including files from this version of Unix. 
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.he 'ILGINS (II)'3/15/72'ILGINS (II)'
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NAME		ilgins  --  catch illegal instruction trap
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SYNOPSIS	sys ilgins; arg  / ilgins = 33.
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DESCRIPTION	ilgins______
allows a program to catch illegal instruction traps.
If arg___
is zero, the normal instruction trap handling is done:
the process is terminated and a core image is produced.
If arg___
is a location within the program, control
is passed to arg___ when the trap occurs.
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This call is used to implement the floating point simulator,
which catches and interprets 11/45 floating point
instructions.
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To return after catching the
ilgins______
trap, execute the rti___ instruction.
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SEE ALSO	PDP-11 manual
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DIAGNOSTICS	--
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BUGS		--