508 lines
9 KiB
C
508 lines
9 KiB
C
/*
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* Sources of the "MISCELLANEOUS" group instructions
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*/
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/* $Header$ */
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#include <em_abs.h>
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#include "logging.h"
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#include "global.h"
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#include "log.h"
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#include "trap.h"
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#include "warn.h"
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#include "mem.h"
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#include "memdirect.h"
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#include "shadow.h"
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#include "text.h"
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#include "read.h"
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#include "fra.h"
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#include "rsb.h"
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#include "linfil.h"
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extern int running; /* from main.c */
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/* Two useful but unofficial registers */
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long LIN;
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ptr FIL;
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PRIVATE index_jump(), range_check(), search_jump();
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PRIVATE gto();
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#define asp(l) newSP(SP + arg_f(l))
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DoASP(l)
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register long l;
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{
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/* ASP f: Adjust the stack pointer by f */
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LOG(("@M6 DoASP(%ld)", l));
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asp(l);
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}
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DoASS(l)
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register size l;
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{
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/* ASS w: Adjust the stack pointer by w-byte integer */
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LOG(("@M6 DoASS(%ld)", l));
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spoilFRA();
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l = spop(arg_wi(l));
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asp(l);
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}
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#define block_move(a1,a2,n) \
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if (in_stack(a1)) { \
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if (in_stack(a2)) st_mvs(a1, a2, n); \
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else st_mvd(a1, a2, n); } \
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else { if (in_stack(a2)) dt_mvs(a1, a2, n); \
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else dt_mvd(a1, a2, n); }
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DoBLM(l)
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register size l;
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{
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/* BLM z: Block move z bytes; first pop destination addr, then source addr */
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register ptr dp1, dp2; /* Destination Pointers */
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LOG(("@M6 DoBLM(%ld)", l));
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spoilFRA();
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dp1 = dppop();
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dp2 = dppop();
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block_move(dp1, dp2, arg_z(l));
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}
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DoBLS(l)
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register size l;
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{
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/* BLS w: Block move, size is in w-byte integer on top of stack */
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register ptr dp1, dp2;
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LOG(("@M6 DoBLS(%ld)", l));
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spoilFRA();
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l = upop(arg_wi(l));
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dp1 = dppop();
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dp2 = dppop();
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block_move(dp1, dp2, arg_z(l));
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}
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DoCSA(l)
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register size l;
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{
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/* CSA w: Case jump; address of jump table at top of stack */
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LOG(("@M6 DoCSA(%ld)", l));
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spoilFRA();
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index_jump(arg_wi(l));
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}
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DoCSB(l)
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register size l;
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{
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/* CSB w: Table lookup jump; address of jump table at top of stack */
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LOG(("@M6 DoCSB(%ld)", l));
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spoilFRA();
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search_jump(arg_wi(l));
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}
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DoDCH()
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{
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/* DCH -: Follow dynamic chain, convert LB to LB of caller */
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register ptr lb;
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LOG(("@M6 DoDCH()"));
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spoilFRA();
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lb = dppop();
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if (!is_LB(lb)) {
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wtrap(WDCHBADLB, ESTACK);
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}
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dppush(st_lddp(lb + rsb_LB));
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}
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DoDUP(arg)
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size arg;
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{
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/* DUP s: Duplicate top s bytes */
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register ptr oldSP = SP;
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LOG(("@M6 DoDUP(%ld)", arg));
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spoilFRA();
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st_inc(arg_s(arg));
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st_mvs(SP, oldSP, arg);
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}
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DoDUS(l)
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register size l;
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{
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/* DUS w: Duplicate top w bytes */
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register ptr oldSP;
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LOG(("@M6 DoDUS(%ld)", l));
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spoilFRA();
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l = upop(arg_wi(l));
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oldSP = SP;
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st_inc(arg_s(l));
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st_mvs(SP, oldSP, l);
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}
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DoEXG(l)
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register size l;
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{
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/* EXG w: Exchange top w bytes */
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register ptr oldSP = SP;
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LOG(("@M6 DoEXG(%ld)", l));
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spoilFRA();
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st_inc(arg_w(l));
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st_mvs(SP, oldSP, l);
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st_mvs(oldSP, oldSP + l, l);
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st_mvs(oldSP + l, SP, l);
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st_dec(l);
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}
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DoFIL(arg)
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register unsigned long arg;
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{
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/* FIL g: File name (external 4 := g) */
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register ptr p = i2p(arg);
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LOG(("@M6 DoFIL(%lu)", p));
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spoilFRA();
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if (p > HB) {
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wtrap(WILLFIL, EILLINS);
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}
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putFIL(arg_g(p));
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}
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DoGTO(arg)
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register unsigned long arg;
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{
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/* GTO g: Non-local goto, descriptor at g */
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register ptr p = i2p(arg);
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LOG(("@M6 DoGTO(%lu)", p));
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gto(arg_gto(p));
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}
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DoLIM()
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{
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/* LIM -: Load 16 bit ignore mask */
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LOG(("@M6 DoLIM()"));
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spoilFRA();
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wpush(IgnMask);
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}
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DoLIN(l)
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register unsigned long l;
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{
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/* LIN n: Line number (external 0 := n) */
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LOG(("@M6 DoLIN(%lu)", l));
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spoilFRA();
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putLIN((long) arg_lin(l));
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}
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DoLNI()
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{
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/* LNI -: Line number increment */
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LOG(("@M6 DoLNI()"));
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spoilFRA();
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putLIN((long)getLIN() + 1);
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}
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DoLOR(l)
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register long l;
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{
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/* LOR r: Load register (0=LB, 1=SP, 2=HP) */
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LOG(("@M6 DoLOR(%ld)", l));
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spoilFRA();
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switch ((int) arg_r(l)) {
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case 0:
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dppush(LB);
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break;
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case 1:
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dppush(SP);
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break;
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case 2:
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dppush(HP);
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break;
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}
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}
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DoLPB()
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{
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/* LPB -: Convert local base to argument base */
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register ptr lb;
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LOG(("@M6 DoLPB()"));
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spoilFRA();
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lb = dppop();
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if (!is_LB(lb)) {
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wtrap(WLPBBADLB, ESTACK);
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}
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dppush(lb + rsbsize);
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}
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DoMON()
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{
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/* MON -: Monitor call */
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LOG(("@M6 DoMON()"));
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spoilFRA();
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moncall();
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}
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DoNOP()
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{
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/* NOP -: No operation */
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LOG(("@M6 DoNOP()"));
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spoilFRA();
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message("NOP instruction");
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}
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DoRCK(l)
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register size l;
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{
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/* RCK w: Range check; trap on error */
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LOG(("@M6 DoRCK(%ld)", l));
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spoilFRA();
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range_check(arg_wi(l));
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}
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DoRTT()
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{
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/* RTT -: Return from trap */
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LOG(("@M6 DoRTT()"));
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switch (poprsb(1)) {
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case RSB_STP:
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warning(WRTTEMPTY);
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running = 0; /* stop the machine */
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return;
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case RSB_CAL:
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warning(WRTTCALL);
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return;
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case RSB_RTT:
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/* OK */
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break;
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case RSB_NRT:
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warning(WRTTNRTT);
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running = 0; /* stop the machine */
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return;
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default:
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warning(WRTTBAD);
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return;
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}
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/* pop the trap number */
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uwpop();
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/* restore the Function Return Area */
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FRA_def = uwpop();
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FRASize = uwpop();
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popFRA(FRASize);
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}
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DoSIG()
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{
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/* SIG -: Trap errors to proc identifier on top of stack, \-2 resets default */
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register long tpi = spop(psize);
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LOG(("@M6 DoSIG()"));
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spoilFRA();
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if (OnTrap == TR_HALT) {
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npush(-2L, psize);
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}
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else npush(TrapPI, psize);
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if (tpi == -2) {
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OnTrap = TR_HALT;
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TrapPI = 0;
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}
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else {
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tpi = arg_p(tpi); /* do not test earlier! */
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OnTrap = TR_TRAP;
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TrapPI = tpi;
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}
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}
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DoSIM()
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{
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/* SIM -: Store 16 bit ignore mask */
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LOG(("@M6 DoSIM()"));
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spoilFRA();
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IgnMask = (uwpop() | PreIgnMask) & MASK2;
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}
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DoSTR(l)
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register long l;
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{
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/* STR r: Store register (0=LB, 1=SP, 2=HP) */
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LOG(("@M6 DoSTR(%ld)", l));
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spoilFRA();
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switch ((int) arg_r(l)) {
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case 0:
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newLB(dppop());
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pop_frames();
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break;
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case 1:
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newSP(dppop());
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break;
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case 2:
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newHP(dppop());
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break;
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}
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}
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DoTRP()
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{
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/* TRP -: Cause trap to occur (Error number on stack) */
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register unsigned int tr = (unsigned int)uwpop();
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LOG(("@M6 DoTRP()"));
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spoilFRA();
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if (tr > 15 || !(IgnMask&BIT(tr))) {
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wtrap(WTRP, (int)tr);
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}
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}
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/* Service routines */
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PRIVATE gto(p)
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ptr p;
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{
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register ptr old_LB = LB;
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register ptr new_PC = dt_ldip(p);
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register ptr new_SP = dt_lddp(p + psize);
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register ptr new_LB = dt_lddp(p + (2 * psize));
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while (old_LB < new_LB) {
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PI = st_lds(old_LB + rsb_PI, psize);
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old_LB = st_lddp(old_LB + rsb_LB);
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}
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if (old_LB != new_LB) {
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wtrap(WGTORSB, EBADGTO);
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}
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newLB(new_LB);
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pop_frames();
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newSP(new_SP);
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newPC(new_PC);
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}
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/*
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The LIN and FIL routines.
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The values of LIN and FIL are kept in EM machine registers
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(variables LIN and FIL) and in the data space.
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*/
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putLIN(lin)
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long lin;
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{
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dt_unprot(i2p(LINO_AD), (long)LINSIZE);
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dt_stn(i2p(LINO_AD), lin, (long)LINSIZE);
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LIN = lin;
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dt_prot(i2p(LINO_AD), (long)LINSIZE);
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}
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putFIL(fil)
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ptr fil;
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{
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dt_unprot(i2p(FILN_AD), psize);
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dt_stdp(i2p(FILN_AD), fil);
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FIL = fil;
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dt_prot(i2p(FILN_AD), psize);
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}
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/********************************************************
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* Case jump by indexing *
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* *
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* 1. pop case descriptor pointer. *
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* 2. pop table index. *
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* 3. Calculate (table index) - (lower bound). *
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* 4. Check if in range. *
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* 5. If in range: load Program Counter value. *
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* 6. Else: load default value. *
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********************************************************/
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PRIVATE index_jump(nbytes)
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size nbytes;
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{
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register ptr cdp = dppop(); /* Case Descriptor Pointer */
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register long t_index = /* Table INDEX */
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spop(nbytes) - mem_lds(cdp + psize, nbytes);
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register ptr nPC; /* New Program Counter */
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if (t_index >= 0 && t_index <= mem_lds(cdp + nbytes + psize, nbytes)) {
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nPC = mem_ldip(cdp + (2 * nbytes) + ((t_index + 1) * psize));
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if (nPC == 0) {
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trap(ECASE);
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}
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}
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else if ((nPC = mem_ldip(cdp)) == 0) {
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trap(ECASE);
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}
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newPC(nPC);
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}
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/********************************************************
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* Case jump by table search *
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* *
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* 1. pop case descriptor pointer. *
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* 2. pop search value. *
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* 3. Load number of table entries. *
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* 4. Check if search value in table. *
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* 5. If found: load Program Counter value. *
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* 6. Else: load default value. *
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********************************************************/
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PRIVATE search_jump(nbytes)
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size nbytes;
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{
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register ptr cdp = dppop(); /* Case Descriptor Pointer */
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register long sv = spop(nbytes);/* Search Value */
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register long nt = /* Number of Table-entries */
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mem_lds(cdp + psize, nbytes);
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register ptr nPC; /* New Program Counter */
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while (--nt >= 0) {
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if (sv == mem_lds(cdp + (nt+1) * (nbytes+psize), nbytes)) {
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nPC = mem_ldip(cdp + nbytes + (nt+1)*(nbytes+psize));
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if (nPC == 0)
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trap(ECASE);
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newPC(nPC);
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return;
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}
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}
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nPC = mem_ldip(cdp);
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if (nPC == 0)
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trap(ECASE);
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newPC(nPC);
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}
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/********************************************************
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* Range check *
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* *
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* 1. Load range descriptor. *
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* 2. Check against lower and upper bound. *
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* 3. Generate trap if necessary. *
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* 4. DON'T remove integer. *
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********************************************************/
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PRIVATE range_check(nbytes)
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size nbytes;
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{
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register ptr rdp = dppop(); /* Range check Descriptor Pointer */
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register long cv = /* Check Value */
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st_lds(SP, nbytes);
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if (must_test && !(IgnMask&BIT(ERANGE))) {
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if ( cv < mem_lds(rdp, nbytes)
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|| cv > mem_lds(rdp + nbytes, nbytes)
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) {
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trap(ERANGE);
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}
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}
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}
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