86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
/*
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* Sources of the "POINTER ARITHMETIC" group instructions
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*/
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/* $Header$ */
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#include <em_abs.h>
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#include "segcheck.h"
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#include "global.h"
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#include "log.h"
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#include "mem.h"
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#include "trap.h"
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#include "warn.h"
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#include "text.h"
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#include "fra.h"
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#define adp(p,w) ((p) + (w))
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#define sbs(t,s) ((s) - (t))
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#ifdef SEGCHECK
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#define check_seg(s1,s2,w) if (s1 != s2) { warning(w); }
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#else
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#define check_seg(s1,s2,w)
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#endif SEGCHECK
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DoADP(l)
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register long l;
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{
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/* ADP f: Add f to pointer on top of stack */
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register ptr p, t = st_lddp(SP);
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LOG(("@R6 DoADP(%ld)", l));
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spoilFRA();
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if (t == 0) {
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warning(WNULLPA);
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}
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l = arg_f(l);
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p = adp(t, l);
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check_seg(ptr2seg(t), ptr2seg(p), WSEGADP);
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st_stdp(SP, p);
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}
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DoADS(l)
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register size l;
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{
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/* ADS w: Add w-byte value and pointer */
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register long t = spop(arg_wi(l));
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register ptr p, s = st_lddp(SP);
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LOG(("@R6 DoADS(%ld)", l));
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spoilFRA();
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t = arg_f(t);
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if (s == 0) {
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warning(WNULLPA);
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}
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p = adp(s, t);
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check_seg(ptr2seg(s), ptr2seg(p), WSEGADP);
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st_stdp(SP, p);
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}
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DoSBS(l)
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register size l;
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{
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/* SBS w: Subtract pointers in same fragment and push diff as size w integer */
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register ptr t = st_lddp(SP);
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register ptr s = st_lddp(SP + psize);
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register long w;
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LOG(("@R6 DoSBS(%ld)", l));
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spoilFRA();
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l = arg_wi(l);
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check_seg(ptr2seg(t), ptr2seg(s), WSEGSBS);
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w = sbs(t, s);
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if (must_test && !(IgnMask&BIT(EIOVFL))) {
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if (l == 2 && (w < I_MINS2 || w > I_MAXS2))
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trap(EIOVFL);
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}
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dppop();
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dppop();
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npush(w, l);
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}
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