170 lines
3.2 KiB
Plaintext
170 lines
3.2 KiB
Plaintext
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#include "e.h"
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exa .HTOP ; the label holtop
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exa .1 ; the Pascal global area
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exa _extfl ; the routine '_ini' puts 'input' & 'output' here
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exp $ESTART0
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exp $ESTART_
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exp $ESTOP_
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exp $ABORT
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; PROCEDURE ESTART0
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pro $ESTART0,0
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lor 0 ; my LB
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dup SZADDR
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dch ; m_a_i_n's LB
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dup SZADDR
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str 0 ; pretend I am in m_a_i_n
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lae .HTOP-FIRSTIBOFFSET; destination address (holtop-firstiboffset)
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; now calc how much to move
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lal 0
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lor 0
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sbs SZWORD ; subtract address of param from lb to get link space
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loc SZWORD+SZADDR+SZADDR
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ads SZWORD ; allow for one parameter of m_a_i_n
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bls SZWORD ; block move
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; now the global area contains an exact copy of
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; m_a_i_n's stack frame, and main will subsequently
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; adjust its LB to point to this global copy, thus
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; making it a part of the official stack.
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str 0 ; get my LB back
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ret 0
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end 0
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; PROCEDURE ESTART_ (INPUT,OUTPUT);
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pro $ESTART_,0
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.2
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con 2,0,0 ; array that is to be _extfl
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.3
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con 0I SZADDR ; PASCAL trap routine
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.4
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con 0 ; trapn
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con 0 ; signaln
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LFL SZADDR+SZADDR ; base address for input (2nd param)
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lae .1
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sbs SZWORD ; subtract address from hol1 to get offset
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ste .2+SZWORD ; store in array of offsets
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LFL SZADDR ; and again for output (1st param after static link)
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lae .1
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sbs SZWORD
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ste .2+SZWORD+SZWORD ; store in array
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lxl 2 ; params for _ini
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lae .2
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lae .1
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lxa 2
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cal $_ini
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asp SZADDR+SZADDR+SZADDR+SZADDR
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loc A68STAMP ; m_a_i_n's frame stamp, for isa68, any positive number
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ste .HTOP-FSTAMPOFFSET ; it is in a SZWORD integer, 1st local var
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inp $_usigs
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cal $_usigs ; catch UNIX interrupts as EM trap 15
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inp $_acatch
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lpi $_acatch ; A68 trap routine
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sig
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lae .3
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sti SZWORD ; preserve PASCAL trap routine
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zre .4 ; trapn
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ret 0
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end 0
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; procedure usigs;
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; var i: integer;
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; begin
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; for i := 1 to 16 do signal(i, ucatch);
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; end;
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pro $_usigs,SZWORD
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mes 9,0
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loc 1
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loc 16
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bgt *2
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loc 1
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stl -SZWORD
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1
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zer SZWORD
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inp $_ucatch
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lpi $_ucatch
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lol -SZWORD
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cal $signal
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asp SZWORD+SZWORD+SZWORD
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lol -SZWORD
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loc 16
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beq *2
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lol -SZWORD
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inc
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stl -SZWORD
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bra *1
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2
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mes 3,-SZWORD,4,1
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ret 0
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end SZWORD
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; procedure ucatch(signo: integer);
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; begin
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; trap(15);
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; end;
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pro $_ucatch,0
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mes 9,4
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lol 0
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ste .4+SZWORD ; signaln
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#ifdef BSD4
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loc 0
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cal $sigsetmask ; unblock all signals
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asp SZWORD
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LLC 0 ; SIG_DFL
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lol 0
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cal $signal ; because 4.2 Inices do not reset caught signals
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asp SZADDR+SZWORD
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#endif
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loc 15
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cal $trap
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asp SZWORD
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mes 3,0,4,0
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ret 0
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end 0
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pro $_acatch,SZWORD
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loc PASCALSTAMP
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stl -SZWORD
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lol 0 ; EM trap number
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dup SZWORD
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ste .4 ; trapn
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ngi SZWORD
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lxl 0
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cal $ERRORR ; should never return
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end SZWORD
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pro $ESTOP_,0
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loc 0
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cal $_hlt
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end 0
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pro $ABORT,0
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loe .4 ; trapn
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zne *1
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loc 1 ; if abort is called then presumably some error has
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; occured, thus exit code 1
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cal $_hlt
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1
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loe .4 ; trapn
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loc 15
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bne *2 ; if not a UNIX signal
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cal $_cleanup
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loe .4+SZWORD ; signaln
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cal $getpid
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lfr SZWORD
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cal $kill
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2
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lae .3 ; PASCAL trap routine
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loi SZWORD
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dup SZWORD
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zeq *3 ; no PASCAL trap routine
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sig
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asp SZWORD
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loe .4
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trp ; now let PASCAL handle the same trap
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3
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loe .4 ; trapn
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cal $_catch
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end 0
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