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	TITLE	EXOSUP - Compiler execute only support code (TOPS-10)
	SUBTTL	EGM/EGM

;COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1981, 1987
;ALL RIGHTS RESERVED.
;
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
;ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH LICENSE AND WITH THE
;INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY  OTHER
;COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
;OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF THE  SOFTWARE  IS  HEREBY
;TRANSFERRED.
;
;THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT  NOTICE
;AND  SHOULD  NOT  BE  CONSTRUED  AS A COMMITMENT BY DIGITAL EQUIPMENT
;CORPORATION.
;
;DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY  OF  ITS
;SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.

;Author: EGM

	INTERN	EXOSUV
	EXOSUV=	BYTE (3)0(9)6(6)0(18)^D2	; Version Date: 26-Aug-81

	TWOSEG

Comment \

***** Begin Revision History *****

1	1047	EGM	21-Jan-81	Q10-05323
	Create module for TOPS-10 execute only support.

2	1117	EGM	26-Aug-81	--------
	Remove restrictions that the high seg startup routine appear first in
	the high seg, and the high seg start at 400000. Also allow high seg
	exit/re-entry routines to be called with arguments if needed.

***** End Revision History *****

\


;	AC definitions for prolog/epilog.
;	Dictated by the BLIS10 module head
;	(RESERVE(0,1,2,3),SREG=#17,FREG=#16,VREG=#15,DREGS=4).
;	Changes must occur if any of the above change.
;	New prologs/epilogs must be added if DREGS increases.

	RSVD0==0	;Reserved register 0
	RSVD1==1	;Reserved register 1
	RSVD2==2	;Reserved register 2
	RSVD3==3	;Reserved register 3
	JSPREG==10	;Temporary register for JSPs
	DREG4==11	;Savable register 4
	DREG3==12	;Savable register 3
	DREG2==13	;Savable register 2
	DREG1==14	;Savable register 1
	VREG==15	;Value register
	FREG==16	;Frame register
	SREG==17	;Stack register

;	These prologs/epilogs are used only by the low seg
;	and have been created expressly for the ability to run
;	the compiler execute only on TOPS-10.
;	These routines must reside in the low seg.
;	The code has been derived directly from the BLIS10
;	prolog/epilog code generated in module GLOBAL.

	ENTRY	FORI.0,FORO.0
	ENTRY	FORI.1,FORO.1
	ENTRY	FORI.2,FORO.2
	ENTRY	FORI.3,FORO.3
	ENTRY	FORI.4,FORO.4

;	Low segment prologs.

FORI.0:	PUSH	SREG,FREG
	HRRZ	FREG,SREG
	JRST	(JSPREG)

FORI.1:	PUSH	SREG,FREG
	HRRZ	FREG,SREG
	PUSH	SREG,DREG1
	JRST	(JSPREG)

FORI.2:	PUSH	SREG,FREG
	HRRZ	FREG,SREG
	PUSH	SREG,DREG1
	PUSH	SREG,DREG2
	JRST	(JSPREG)

FORI.3:	PUSH	SREG,FREG
	HRRZ	FREG,SREG
	PUSH	SREG,DREG1
	PUSH	SREG,DREG2
	PUSH	SREG,DREG3
	JRST	(JSPREG)

FORI.4:	PUSH	SREG,FREG
	HRRZ	FREG,SREG
	PUSH	SREG,DREG1
	PUSH	SREG,DREG2
	PUSH	SREG,DREG3
	PUSH	SREG,DREG4
	JRST	(JSPREG)

;	Low segment epilogs.

FORO.4:	POP	SREG,DREG4
FORO.3:	POP	SREG,DREG3
FORO.2:	POP	SREG,DREG2
FORO.1:	POP	SREG,DREG1
FORO.0:	POP	SREG,FREG
	POPJ	SREG,


;	The following routines setup the proper PORTALs
;	to allow calls into and from the high seg.
;[1117]	The initial routine (HISEG) must appear at the
;[1117]	same location in each high seg.

	RELOC 400000

	T1==RSVD1		;Safe register to use for calls/returns
	P==SREG			;Common stack pointer


	ENTRY	HISEG		;Common High seg entry
	ENTRY	XPHAZCONTROL	;Execute only call to PHAZCONTROL
	ENTRY	XNXFILG		;Execute only call to NXFILG


	EXTERN	PHAZCONTROL	;Segment control routine in low seg
	EXTERN	NXFILG		;Next file spec routine in low seg
	INTERN	HSGORG		;[1117]High seg origin, set by COMMAN

;	The following routine is entered via a PUSHJ P,HISEG.
;	It uses the 'safe' AC 1, which is of no value between phases.

HISEG:	PORTAL	.+1		;Proper high seg entry
	MOVE	T1,HSGORG	;[1117]Get high seg origin
	HRRZ	T1,.JBHSA##(T1)	;[1117]Start address for this segment
	JRST	@T1		;And start it

;	The following routines allow hi seg exit/re-entry.
;[1117]	Note that they will work for calls that pass arguments,
;[1117]	since they effectively leave just one PC on the stack.
;[1117] Also note that they are used by all versions of the compiler.

XPHAZC:	POP	P,SPHAZC	;[1117]Save return address
	PUSHJ	P,PHAZCO	;Call segment control
	PORTAL	.+1		;Proper high seg re-entry
	PUSH	P,SPHAZC	;[1117]Restore return address
	POPJ	P,		;Continue

XNXFIL:	POP	P,SNXFIL	;[1117]Save return address
	PUSHJ	P,NXFILG	;Call to get next file spec
	PORTAL	.+1		;Proper return
	PUSH	P,SNXFIL	;[1117]Restore return address
	POPJ	P,		;Onward

	RELOC			;[1117]Back to low seg
HSGORG:	0			;[1117]Origin of high seg
SPHAZC:	0			;[1117]XPHAZCO return PC
SNXFIL:	0			;[1117]XNXFIL return PC

	END