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pdp11dis.js
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// PDP-11 assembler and disassembler module
// the disassembler part is based on program pinst.c written by Martin Minow
// module ported from Delphi Pascal (Piotr Piątek) to JS (Bs0Dd)
// 2024 (c) Bs0Dd
var DIGITS = '0123456789ABCDEFabcdef';
var INBUF = "";
var ININDEX = 0;
var OUTBUF = new Uint16Array(3);
var OUTINDEX = 0;
var PDP11_KINDS = {
ILLOP: "ILLOP", //{ illop }
NONE: "NONE", //{ halt }
RTS: "RTS", //{ rts reg }
DOUBLE: "DOUBLE", //{ mov src,dst }
ADD: "ADD", //{ add src,dst }
SWBYTE: "SWBYTE", //{ sop[b] dst }
SINGLE: "SINGLE", //{ sop dst }
JSR: "JSR", //{ jsr reg,dst }
MUL: "MUL", //{ mul src,reg }
BR: "BR", //{ br addr }
SOB: "SOB", //{ sob reg,addr }
SPL: "SPL", //{ spl n }
MARK: "MARK", //{ mark n }
TRAP: "TRAP", //{ trap n }
CODE: "CODE", //{ se[cvnz] }
DATA: "DATA" //{ .word }
}
var PDP11_MNEMS = [
{ mask:0xFFFF, op:0x0000, str:'halt', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0001, str:'wait', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0002, str:'rti', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0003, str:'bpt', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0004, str:'iot', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0005, str:'reset', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0006, str:'rtt', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x000A, str:'go', kind:PDP11_KINDS.NONE },
{ mask:0xFFFC, op:0x0008, str:'go', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x000E, str:'step', kind:PDP11_KINDS.NONE },
{ mask:0xFFFC, op:0x000C, str:'step', kind:PDP11_KINDS.NONE },
{ mask:0xFFF7, op:0x0010, str:'rsel', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0011, str:'mfus', kind:PDP11_KINDS.NONE },
{ mask:0xFFFE, op:0x0012, str:'rcpc', kind:PDP11_KINDS.NONE },
{ mask:0xFFFC, op:0x0014, str:'rcps', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0019, str:'mtus', kind:PDP11_KINDS.NONE },
{ mask:0xFFFE, op:0x001A, str:'wcpc', kind:PDP11_KINDS.NONE },
{ mask:0xFFFC, op:0x001C, str:'wcps', kind:PDP11_KINDS.NONE },
{ mask:0xFFE0, op:0x0000, str:'illop', kind:PDP11_KINDS.ILLOP },
{ mask:0xFFC0, op:0x0040, str:'jmp', kind:PDP11_KINDS.SINGLE },
{ mask:0xFFF8, op:0x0080, str:'rts', kind:PDP11_KINDS.RTS },
{ mask:0xFFF0, op:0x0088, str:'illop', kind:PDP11_KINDS.ILLOP },
{ mask:0xFFF8, op:0x0098, str:'spl', kind:PDP11_KINDS.SPL },
{ mask:0xFFFF, op:0x00A0, str:'nop', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x00A1, str:'clc', kind:PDP11_KINDS.NONE },
{ mask:0xFFF0, op:0x00A0, str:'clear', kind:PDP11_KINDS.CODE },
{ mask:0xFFFF, op:0x00B1, str:'sec', kind:PDP11_KINDS.NONE },
{ mask:0xFFF0, op:0x00B0, str:'set', kind:PDP11_KINDS.CODE },
{ mask:0xFFC0, op:0x00C0, str:'swab', kind:PDP11_KINDS.SINGLE },
{ mask:0xFF00, op:0x0100, str:'br', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x0200, str:'bne', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x0300, str:'beq', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x0400, str:'bge', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x0500, str:'blt', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x0600, str:'bgt', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x0700, str:'ble', kind:PDP11_KINDS.BR },
{ mask:0xFE00, op:0x0800, str:'jsr', kind:PDP11_KINDS.JSR },
{ mask:0x7FC0, op:0x0A00, str:'clr', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0A40, str:'com', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0A80, str:'inc', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0AC0, str:'dec', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0B00, str:'neg', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0B40, str:'adc', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0B80, str:'sbc', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0BC0, str:'tst', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0C00, str:'ror', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0C40, str:'rol', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0C80, str:'asr', kind:PDP11_KINDS.SWBYTE },
{ mask:0x7FC0, op:0x0CC0, str:'asl', kind:PDP11_KINDS.SWBYTE },
{ mask:0xFFC0, op:0x0D00, str:'mark', kind:PDP11_KINDS.MARK },
{ mask:0xFFC0, op:0x0D40, str:'mfpi', kind:PDP11_KINDS.SINGLE },
{ mask:0xFFC0, op:0x0D80, str:'mtpi', kind:PDP11_KINDS.SINGLE },
{ mask:0xFFC0, op:0x0DC0, str:'sxt', kind:PDP11_KINDS.SINGLE },
{ mask:0xFE00, op:0x0E00, str:'illop', kind:PDP11_KINDS.ILLOP },
{ mask:0x7000, op:0x1000, str:'mov', kind:PDP11_KINDS.DOUBLE },
{ mask:0x7000, op:0x2000, str:'cmp', kind:PDP11_KINDS.DOUBLE },
{ mask:0x7000, op:0x3000, str:'bit', kind:PDP11_KINDS.DOUBLE },
{ mask:0x7000, op:0x4000, str:'bic', kind:PDP11_KINDS.DOUBLE },
{ mask:0x7000, op:0x5000, str:'bis', kind:PDP11_KINDS.DOUBLE },
{ mask:0xF000, op:0x6000, str:'add', kind:PDP11_KINDS.ADD },
{ mask:0xF000, op:0xE000, str:'sub', kind:PDP11_KINDS.ADD },
{ mask:0xFE00, op:0x7000, str:'mul', kind:PDP11_KINDS.MUL },
{ mask:0xFE00, op:0x7200, str:'div', kind:PDP11_KINDS.MUL },
{ mask:0xFE00, op:0x7600, str:'ashc', kind:PDP11_KINDS.MUL },
{ mask:0xFE00, op:0x7400, str:'ash', kind:PDP11_KINDS.MUL },
{ mask:0xFE00, op:0x7800, str:'xor', kind:PDP11_KINDS.JSR },
{ mask:0xFFF8, op:0x7A00, str:'fadd', kind:PDP11_KINDS.RTS },
{ mask:0xFFF8, op:0x7A08, str:'fsub', kind:PDP11_KINDS.RTS },
{ mask:0xFFF8, op:0x7A10, str:'fmul', kind:PDP11_KINDS.RTS },
{ mask:0xFFF8, op:0x7A18, str:'fdiv', kind:PDP11_KINDS.RTS },
{ mask:0xFE00, op:0x7E00, str:'sob', kind:PDP11_KINDS.SOB },
{ mask:0xF800, op:0x7800, str:'illop', kind:PDP11_KINDS.ILLOP },
{ mask:0xFF00, op:0x8000, str:'bpl', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8100, str:'bmi', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8600, str:'bcc', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8600, str:'bhis', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8200, str:'bhi', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8300, str:'blos', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8400, str:'bvc', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8500, str:'bvs', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8700, str:'bcs', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8700, str:'blo', kind:PDP11_KINDS.BR },
{ mask:0xFF00, op:0x8800, str:'emt', kind:PDP11_KINDS.TRAP },
{ mask:0xFF00, op:0x8900, str:'trap', kind:PDP11_KINDS.TRAP },
{ mask:0xFFC0, op:0x8D00, str:'mtps', kind:PDP11_KINDS.SINGLE },
{ mask:0xFFC0, op:0x8D40, str:'mfpd', kind:PDP11_KINDS.SINGLE },
{ mask:0xFFC0, op:0x8D80, str:'mtpd', kind:PDP11_KINDS.SINGLE },
{ mask:0xFFC0, op:0x8DC0, str:'mfps', kind:PDP11_KINDS.SINGLE },
{ mask:0x0000, op:0x0000, str:'illop', kind:PDP11_KINDS.ILLOP },
{ mask:0x0000, op:0xFFFF, str:'.word', kind:PDP11_KINDS.DATA }
]
var PDP11_REGS = [
{ mask:0xFFFF, op:0x0000, str:'r0', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0001, str:'r1', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0002, str:'r2', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0003, str:'r3', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0004, str:'r4', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0005, str:'r5', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0006, str:'sp', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0007, str:'pc', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0006, str:'r6', kind:PDP11_KINDS.NONE },
{ mask:0xFFFF, op:0x0007, str:'r7', kind:PDP11_KINDS.NONE }
]
//{ fetch a word from the memory, advance the location counter }
function FetchWord() {
var word;
if ((DISADDR >= ROMSTA) && (DISADDR < (ROM.length+ROMSTA))) {
word = (((ROM[DISADDR-ROMSTA+1] & 0xFF) << 8) | (ROM[DISADDR-ROMSTA] & 0xFF));
}
else if ((DISADDR >= RAMSTA) && (DISADDR < (RAM.length+RAMSTA))) {
word = (((RAM[DISADDR-RAMSTA+1] & 0xFF) << 8) | (RAM[DISADDR-RAMSTA] & 0xFF));
}
else {
word = null;
}
DISADDR+=2;
return word;
}
function StoreWord(x) {
if ((DISADDR >= ROMSTA) && (DISADDR < (ROM.length+ROMSTA))) {
ROM[DISADDR-ROMSTA+1] = (x>>8) & 0xFF;
ROM[DISADDR-ROMSTA] = x & 0xFF;
}
else if ((DISADDR >= RAMSTA) && (DISADDR < (RAM.length+RAMSTA))) {
RAM[DISADDR-RAMSTA+1] = (x>>8) & 0xFF;
RAM[DISADDR-RAMSTA] = x & 0xFF;
}
DISADDR+=2;
}
//{ DISASSEMBLER FUNCTIONS }
//{ returns the name of the register r }
function preg(r) {
return PDP11_REGS[r&7].str;
}
//{ returns the addressing mode }
function paddr(m) {
var r = m & 0x07;
var s = ((m & 0x08) == 0) ? "" : "@";
switch(m&0x38) {
case 0x00:
return preg(r);
case 0x08:
return '(' + preg(r) + ')';
case 0x10:
case 0x18:
return (r == 0x07) ? (s + '#' + FetchWord().toString(DISOCT ? 8 : 16).toUpperCase()) : (s + '(' + preg(r) + ')+');
case 0x20:
case 0x28:
return s + '-(' + preg(r) + ')';
case 0x30:
case 0x38:
if (r == 0x07) {
var t = FetchWord();
return s + HexOrOct(DISADDR+t, DISOCT);
}
else {
return s + HexOrOct(FetchWord(), DISOCT) + '(' + preg(r) + ')';
}
}
}
//{ returns the names of the CCR register bits }
function ccr(x) {
var s="";
if ((x & 1) != 0) {s += 'c'};
if ((x & 2) != 0) {s += 'v'};
if ((x & 4) != 0) {s += 'z'};
if ((x & 8) != 0) {s += 'n'};
return s;
}
//{ returns the index to the 'mnem' table for op-code x }
function ScanMnemTab(x) {
for (r = 0; r<PDP11_MNEMS.length; r++) {
if ((x & PDP11_MNEMS[r].mask) == PDP11_MNEMS[r].op) {
return r;
}
}
return PDP11_MNEMS.length-1;
}
//{ returns the mnemonic }
function Mnemonic (i, size) {
var res = PDP11_MNEMS[i].str;
if ((PDP11_MNEMS[i].kind == PDP11_KINDS.SWBYTE) || (PDP11_MNEMS[i].kind == PDP11_KINDS.DOUBLE)) {
res+=size;
}
return res;
}
//{ returns the arguments }
function Arguments (i, x) {
var res;
switch (PDP11_MNEMS[i].kind) {
case PDP11_KINDS.SPL:
res = DIGITS[(x & 0x07) + 1];
break;
case PDP11_KINDS.RTS:
res = preg(x);
break;
case PDP11_KINDS.SINGLE:
case PDP11_KINDS.SWBYTE:
res = paddr(x);
break;
case PDP11_KINDS.DOUBLE:
case PDP11_KINDS.ADD:
res = paddr(Math.floor(x / 64)) + ',' + paddr(x);
break;
case PDP11_KINDS.JSR:
res = preg (Math.floor(x / 64)) + ',' + paddr(x);
break;
case PDP11_KINDS.MUL:
res = paddr(x) + ',' + preg(Math.floor(x / 64));
break;
case PDP11_KINDS.BR:
x &= 0xFF;
if ((x & 0x80) != 0) {
x |= 0xFF00;
}
res = HexOrOct(DISADDR + 2*x, DISOCT);
break;
case PDP11_KINDS.SOB:
res = preg(Math.floor(x / 64)) + ',' + HexOrOct((DISADDR - 2*(x & 0x3F)), DISOCT);
break;
case PDP11_KINDS.MARK:
res = HexOrOct((x & 0x3F), DISOCT);
break;
case PDP11_KINDS.TRAP:
res = HexOrOct((x & 0xFF), DISOCT);
break;
case PDP11_KINDS.CODE:
res = ccr(x);
break;
default:
res = '';
}
return res;
}
//{ ASSEMBLER FUNCTIONS }
//{ compare the string 's' with the 'InBuf' at location 'InIndex' without
// the case sensitivity,
// update the 'InIndex' and return True if both string match }
function ParseString(s) {
if ((ININDEX + s.length-1) > INBUF.length) return false;
var n = 0;
var iblc = INBUF.toLowerCase();
for (; n < s.length; n++) {
if (s[n] != iblc[ININDEX+n]) return false;
}
ININDEX+=n;
return true;
}
//{ returns index to the table of type 'tab' or -1 if mnemonic not found }
function ParseTable(t, last) {
for (let r=0; r < last; r++) {
if (ParseString(t[r].str)) return r;
}
return -1;
}
//{ function expects a number in base 'radix',
// returns count of processed characters,
// updates the InIndex,
// places the value of the number in OutBuf[OutIndex] }
function ParseNumber() {
var x = 0;
var r = 0;
while (ININDEX < INBUF.length) {
y = parseInt(INBUF[ININDEX], DISOCT ? 8 : 16);
if (isNaN(y)) break;
x = (x*(DISOCT ? 8 : 16)) + y;
ININDEX++;
r++;
}
OUTBUF[OUTINDEX] = x;
return r;
}
// { move the 'InIndex' to the first character different from space,
// returns True if at least single space processed }
function ParseBlanks() {
var r = false;
while (ININDEX < INBUF.length) {
if (INBUF[ININDEX] != " ") break;
r = true;
ININDEX++;
}
return r;
}
//{ a specified character expected }
function ParseChar(c) {
var r = (ININDEX < INBUF.length) && (INBUF[ININDEX] == c);
if (r) ININDEX++;
return r;
}
//{ comma expected }
function ParseComma(){
ParseBlanks();
var r = ParseChar(',');
ParseBlanks();
return r;
}
//{ returns address mode or value > $3F if error }
function ParseAddr() {
var r = 0x8000;
if (ParseChar('@')) r |= 0x0008;
//{ Ri }
var i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i >= 0) {r |= PDP11_REGS[i].op;}
//{ #n }
else if (ParseChar('#')){
r |= 0x0017;
if (ParseNumber() == 0) return r; //{ failure, a number expected }
OUTINDEX++
}
//{ -(Ri) }
else if (ParseChar('-')){
if (!ParseChar('(')) return r; //{ failure, opening bracket expected }
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return r; //{ failure, register name expected }
if (!ParseChar(')')) return r; //{ failure, closing bracket expected }
r |= 0x0020 | PDP11_REGS[i].op;
}
//{ (Ri) or (Ri)+ }
else if (ParseChar('(')) {
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return r; //{ failure, register name expected }
if (!ParseChar(')')) return r; //{ failure, closing bracket expected }
r |= PDP11_REGS[i].op;
if (ParseChar('+')) { //{ (Ri)+ }
r |= 0x0010;
}
else {
if ((result & 0x0008) == 0){
r |= 0x0008 //{ (Ri) = @Ri }
}
else {
r |= 0x0030; //{ @(Ri) = @0000(Ri) }
OUTBUF[OUTINDEX] = 0;
OUTINDEX++;
}
}
}
//{ n or n(Ri) }
else if (ParseNumber() > 0) {
if (ParseChar('(')) {
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return r; //{ failure, register name expected }
if (!ParseChar(')')) return r; //{ failure, closing bracket expected }
r |= 0x0030 | PDP11_REGS[i].op;
}
else {
OUTBUF[OUTINDEX] = OUTBUF[OUTINDEX] - DISADDR - (2*OUTINDEX) - 2;
r |= 0x0037;
}
OUTINDEX++;
}
return r & 0x3F; //{ success }
}
//{ assemble the instruction in the 'InBuf' and place the result in the OutBuf,
// expects the address in 'loc', but doesn't update it,
// on exit 'InIndex' contains the position of an error (warning: it can
// point past the end of the 'InBuf'!), otherwise 0 }
function Assemble() {
ININDEX = 0;
OUTINDEX = 0;
//{ skip leading blanks }
ParseBlanks();
if (ININDEX > INBUF.length) { //{ empty InBuf? }
ININDEX = 0;
return "OK - empty buffer";
}
// { parse the mnemonic }
var i = ParseTable(PDP11_MNEMS, PDP11_MNEMS.length);
if (i < 0) return "PARSMNEM: mnemonic not recognised"; //{ failure, mnemonic not recognised }
if (PDP11_MNEMS[i].kind == PDP11_KINDS.ILLOP) return "PARSMNEM: invalid mnemonic ('illop')"; //{ failure, invalid mnemonic 'illop' }
OUTBUF[0] = PDP11_MNEMS[i].op;
OUTINDEX = 1;
if ((ININDEX < INBUF.length) && (INBUF[ININDEX].toLowerCase() == 'b')
&& ((PDP11_MNEMS[i].kind == PDP11_KINDS.SWBYTE) || (PDP11_MNEMS[i].kind == PDP11_KINDS.DOUBLE))) {
ININDEX++;
OUTBUF[0] |= 0x8000;
}
//{ space after mnemonic required, unless an instruction without operands }
if (!ParseBlanks() && (PDP11_MNEMS[i].kind != PDP11_KINDS.NONE)) return "PARSBLNK: space after mnemonic required";
// { parse the arguments }
switch(PDP11_MNEMS[i].kind) {
case PDP11_KINDS.SPL:
if (ParseNumber() == 0) return "OP/SPL: a number expected"; // { failure, a number expected }
if (OUTBUF[1] > 7) return "OP/SPL: value out of range"; //{ failure, value out of range }
OUTBUF[0] |= OUTBUF[1];
break;
case PDP11_KINDS.RTS:
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return "OP/RTS: register name expected"; //{ failure, register name expected }
OUTBUF[0] |= PDP11_REGS[i].op;
break;
case PDP11_KINDS.SINGLE:
case PDP11_KINDS.SWBYTE:
var x = ParseAddr();
if (x > 0x3F) return "OP/SINGLE-SWBYTE: failed to parse address mode 1"; // { failure }
OUTBUF[0] |= x;
break;
case PDP11_KINDS.DOUBLE:
case PDP11_KINDS.ADD:
var x = ParseAddr();
if (x > 0x3F) return "OP/DOUBLE-ADD: failed to parse address mode 1"; // { failure }
OUTBUF[0] |= (x << 6);
if (!ParseComma()) return "OP/DOUBLE-ADD: comma expected"; //{ failure, comma expected }
x = ParseAddr();
if (x > 0x3F) return "OP/DOUBLE-ADD: failed to parse address mode 2"; // { failure }
OUTBUF[0] |= x;
break;
case PDP11_KINDS.JSR:
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return "OP/JSR: register name expected"; //{ failure, register name expected }
OUTBUF[0] |= (PDP11_REGS[i].op << 6);
if (!ParseComma()) return "OP/JSR: comma expected"; //{ failure, comma expected }
var x = ParseAddr();
if (x > 0x3F) return "OP/JSR: failed to parse address mode 1"; // { failure }
OUTBUF[0] |= x;
break;
case PDP11_KINDS.MUL:
var x = ParseAddr();
if (x > 0x3F) return "OP/MUL: failed to parse address mode 1"; // { failure }
OUTBUF[0] |= x;
if (!ParseComma()) return "OP/MUL: comma expected"; //{ failure, comma expected }
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return "OP/MUL: register name expected"; //{ failure, register name expected }
OUTBUF[0] |= (PDP11_REGS[i].op << 6);
break;
case PDP11_KINDS.BR:
if (ParseNumber() == 0) return "OP/BR: a number expected"; // { failure, a number expected }
var x = (OUTBUF[1] - DISADDR - 2) >> 1;
if (((x & 0x7F80) != 0) && ((x & 0x7F80) != 0x7F80)) return "OP/BR: branch out of range"; //{ failure, branch out of range }
OUTBUF[0] |= (x & 0xFF);
break;
case PDP11_KINDS.SOB:
i = ParseTable(PDP11_REGS, PDP11_REGS.length);
if (i < 0) return "OP/SOB: register name expected"; //{ failure, register name expected }
OUTBUF[0] |= (PDP11_REGS[i].op << 6);
if (!ParseComma()) return "OP/SOB: comma expected"; //{ failure, comma expected }
if (ParseNumber() == 0) return "OP/SOB: a number expected"; // { failure, a number expected }
var x = (DISADDR + 2 - OUTBUF[1]) >> 1;
if ((x & 0x7FC0) != 0) return "OP/SOB: branch out of range"; // { failure, branch out of range }
OUTBUF[0] |= (x & 0x3F);
break;
case PDP11_KINDS.MARK:
if (ParseNumber() == 0) return "OP/MARK: a number expected"; // { failure, a number expected }
if (OUTBUF[1] > 0x3F) return "OP/MARK: value out of range"; // { failure, value out of range }
OUTBUF[0] |= OUTBUF[1];
break;
case PDP11_KINDS.TRAP:
if (ParseNumber() == 0) return "OP/TRAP: a number expected"; // { failure, a number expected }
if (OUTBUF[1] > 0xFF) return "OP/TRAP: value out of range"; // { failure, value out of range }
OUTBUF[0] |= OUTBUF[1];
break;
case PDP11_KINDS.CODE:
if (ParseChar('c')) {OUTBUF[0] |= 1};
if (ParseChar('v')) {OUTBUF[0] |= 2};
if (ParseChar('z')) {OUTBUF[0] |= 4};
if (ParseChar('n')) {OUTBUF[0] |= 8};
break;
case PDP11_KINDS.DATA:
if (ParseNumber() == 0) return "OP/DATA: a number expected"; // { failure, a number expected }
OUTBUF[0] = OUTBUF[1];
break;
}
// { the rest of the InBuf is allowed to be padded with spaces only }
ParseBlanks();
if (ININDEX == INBUF.length) {ININDEX = 0; return "OK - instruction with operands";} //{ success }
return "ENDCHK: rest of string is allowed to be padded with spaces only"; //{ otherwise failure, extra characters encountered }
}