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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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/* $Id: guard.c,v 1.1.1.1 1998/01/17 15:56:00 release Exp $ */
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#ifndef lint
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static char vcid[] = "$Id: guard.c,v 1.1.1.1 1998/01/17 15:56:00 release Exp $";
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#endif /* lint */
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/*
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guard.c
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These routines are provided to guard registers from use.
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*/
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#include "config.h"
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#include "fail.h"
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#include "procrecs.h"
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#include "addresstypes.h"
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#include "guard.h"
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/*
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guardregs() and guardfregs() take two arguments : an integer
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representing the register to be guarded and a space variable
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representing the current status of the pool of registers. A
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register is guarded by setting its corresponding bit in the
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space variable to 1.
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*/
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space guardreg
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PROTO_N ( ( r,sp ) )
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PROTO_T ( int r X space sp )
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{
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if ((r >= 0 && r <= 8) || (r>=16 && r<=21)||(r >= 22 && r <= 26)||(r==27)) {
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/* r is a fixed point t reg */
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sp.fixed |= (1 << r);
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} /* set bit in the fixed field of sp */
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return sp;
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}
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space guardfreg
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PROTO_N ( ( r, sp ) )
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PROTO_T ( int r X space sp )
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{
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if((r==0)||(r>=10 && r<=21)||(r>=22 && r<=30))
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sp.flt |= (1<<r);
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return sp;
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}
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/*
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Guard takes an expression and protects the register involved
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in the same manner as guardreg and guardfreg. If the expression
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is in store the register can be obtained from the base part
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of the address.
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*/
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space guard
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PROTO_N ( ( w,sp ) )
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PROTO_T ( where w X space sp )
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{
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switch (w.answhere.discrim) {
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case inreg : {
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int r = regalt (w.answhere);
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if((r>=0 && r<=8) || (r>=16 && r<=21) || (r>=22 && r<=27)) {
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sp.fixed |= (1 << r);
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} /* guard reg */
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return sp;
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}
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case infreg : {
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int r = fregalt (w.answhere).fr;
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if ((r<=15) ||(r>=16 && r<=21)||((r>=22) && (r<=30))) {
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sp.flt |= (1 << r);
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} /* guard freg */
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return sp;
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}
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case notinreg : {
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int r = insalt (w.answhere).b.base;
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if((r>=0 && r<=8) || (r>=16 && r<=21) || (r>=22 && r<=27)) {
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sp.fixed |= (1 << r);
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}
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/* guard fixed point t reg used as base of address */
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return sp;
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}
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case insomereg :
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case insomefreg : {
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failer ("Guard ? reg ");
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break;
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}
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default:{
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failer ("error in guard\n");
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break;
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}
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}
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return sp;
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}
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