5 import org.xwt.mips.util.SeekableData;
7 public class JavaSourceCompiler extends Compiler {
8 /** Stores the "case r XXX: ... run_YYYY();" blocks generated by the emitText method/ */
9 private StringBuffer runs = new StringBuffer();
10 /** Stores the "initData" and "cleadData" calls generated by the emitData and emitBSS methods */
11 private StringBuffer inits = new StringBuffer();
12 /** Stores lines to go in the class scope */
13 private StringBuffer classLevel = new StringBuffer();
15 /** The stream to write the compiled output to */
16 private PrintWriter out;
18 /** Prints a blank line to the output stream */
19 private void p() { out.println(); }
20 /** prints the given string (indented by <i>indent</i>*4 spaces) to the output stream */
21 private void p(String s) { out.println(indents[indent] + s); }
22 private void pblock(StringBuffer sb) { out.print(sb.toString()); }
24 /** Used by the p() method to add indentation */
27 private static String indents[] = new String[16];
28 static { String s=""; for(int i=0;i<indents.length;i++,s=s+" ") indents[i] = s; }
30 public JavaSourceCompiler(SeekableData binary, String className, Writer w) throws IOException {
31 super(binary,className);
32 out = new PrintWriter(w);
35 protected void _go() throws Exn, IOException {
38 if (fullClassName.indexOf('.') != -1) {
39 packageName = fullClassName.substring(0, fullClassName.lastIndexOf('.'));
40 className = fullClassName.substring(fullClassName.lastIndexOf('.') + 1);
42 className = fullClassName;
46 p("/* This file was generated from " + source + " by Mips2Java on " + dateTime() + " */");
47 if (packageName != null) p("package " + packageName + ";");
48 if(runtimeStats) p("import java.util.*;");
50 p("public class " + className + " extends " + runtimeClass + " {");
53 p("/* program counter */");
54 p("private int pc = 0;");
56 p("private int lastPC = 0;");
58 p("/* General Purpose registers */");
59 p("private final static int r0 = 0;");
60 p("private int r1, r2, r3, r4, r5, r6, r7,");
61 p(" r8, r9, r10, r11, r12, r13, r14, r15,");
62 p(" r16, r17, r18, r19, r20, r21, r22, r23,");
63 p(" r24, r25, r26, r27, r28, r29, r30, r31,");
64 p(" hi = 0, lo = 0;");
65 p("/* FP registers */");
66 p("private int f0, f1, f2, f3, f4, f5, f6, f7,");
67 p(" f8, f9, f10, f11, f12, f13, f14, f15,");
68 p(" f16, f17, f18, f19, f20, f21, f22, f23,");
69 p(" f24, f25, f26, f27, f28, f29, f30, f31;");
70 p("/* FP Control Register */");
71 p("private int fcsr = 0;");
74 if(onePage) p("private final int[] page = readPages[0];");
76 // Generate main body functions (run_XXXX() blocks, _data[] arrays, etc)
79 for(int i=0;i<elf.sheaders.length;i++) {
80 ELF.SHeader sheader = elf.sheaders[i];
81 String name = sheader.name;
82 // if this section doesn't get loaded into our address space don't worry about it
83 if(sheader.addr == 0x0) continue;
85 highestAddr = Math.max(highestAddr, sheader.addr + sheader.size);
87 if(name.equals(".text"))
88 emitText(sheader.addr, new DataInputStream(sheader.getInputStream()),sheader.size);
89 else if(name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"))
90 emitData(sheader.addr, new DataInputStream(sheader.getInputStream()), sheader.size,name.equals(".rodata"));
91 else if(name.equals(".bss") || name.equals(".sbss"))
92 emitBSS(sheader.addr,sheader.size);
94 throw new Exn("Unknown segment: " + name);
101 // Trampoline (dispatch calls to the appropriate run_XXX() methods
102 p("private final void trampoline() throws ExecutionException {");
104 p("while(state == RUNNING) {");
106 p("switch(pc>>>" + methodShift+ ") {");
109 p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(this.pc&0xffffffffL,16) + \": r2: \" + r2);");
116 p("public " + className + "() {");
118 p("super(" + pageSize + "," + totalPages + "," + (fastMem?"false":"true") + ");");
119 p("entryPoint = " + toHex(elf.header.entry) + ";");
120 if(userInfo != null) {
121 p("userInfoBase=" + toHex(userInfo.addr) + ";");
122 p("userInfoSize=" + userInfo.size + ";");
124 p("gp = " + toHex(gp.addr) + ";");
126 p("brkAddr = " + toHex((highestAddr+4095)&~4095) + ";");
128 p("brkAddr = " + toHex((highestAddr+pageSize-1)&~(pageSize-1)) + ";");
130 p("state = INITIALIZED;");
136 p("public static void main(String[] args) throws Exception {");
138 p("" + className + " me = new " + className + "();");
139 p("int status = me.run(\"" + fullClassName + "\",args);");
140 if(runtimeStats) p("me.printStats();");
141 p("System.exit(status);");
146 // Runtime abstract methods
147 p("protected void _execute() throws ExecutionException { trampoline(); }");
150 p("protected void setCPUState(CPUState state) {");
152 for(int i=1;i<32;i++) p("r" + i + "=state.r[" + i + "];");
153 for(int i=0;i<32;i++) p("f" + i + "=state.f[" + i + "];");
154 p("hi=state.hi; lo=state.lo; fcsr=state.fcsr;");
158 p("protected CPUState getCPUState() {");
160 p("CPUState state = new CPUState();");
161 for(int i=1;i<32;i++) p("state.r[" + i + "]=r" + i+ ";");
162 for(int i=0;i<32;i++) p("state.f[" + i + "]=f" + i +";");
163 p("state.hi=hi; state.lo=lo; state.fcsr=fcsr;");
171 p("private static final " + hashClass + " symbols = new " + hashClass + "();");
174 ELF.Symbol[] symbols = elf.getSymtab().symbols;
175 for(int i=0;i<symbols.length;i++) {
176 ELF.Symbol s = symbols[i];
177 if(s.type == ELF.Symbol.STT_FUNC && s.binding == ELF.Symbol.STB_GLOBAL && (s.name.equals("_call_helper") || !s.name.startsWith("_")))
178 p("symbols.put(\"" + s.name + "\",new Integer(" + toHex(s.addr) + "));");
182 p("public int lookupSymbol(String symbol) { Integer i = (Integer) symbols.get(symbol); return i==null ? -1 : i.intValue(); }");
188 p("private HashMap counters = new HashMap();");
189 p("private void inc(String k) { Long i = (Long)counters.get(k); counters.put(k,new Long(i==null ? 1 : i.longValue() + 1)); }");
190 p("private void printStats() {");
191 p(" Iterator i = new TreeSet(counters.keySet()).iterator();");
192 p(" while(i.hasNext()) { Object o = i.next(); System.err.println(\"\" + o + \": \" + counters.get(o)); }");
201 private int startOfMethod = 0;
202 private int endOfMethod = 0;
204 private void startMethod(int addr) {
205 addr &= ~(maxBytesPerMethod-1);
206 startOfMethod = addr;
207 endOfMethod = addr + maxBytesPerMethod;
208 String methodName = "run_" + Long.toString(addr & 0xffffffffL, 16);
209 runs.append(indents[4] + "case " + toHex(addr>>>methodShift) + ": " + methodName + "(); break; \n");
210 p("private final void " + methodName + "() throws ExecutionException { /"+"* " + toHex(addr) + " - " + toHex(endOfMethod) + " *" + "/");
219 private void endMethod() { endMethod(endOfMethod); }
220 private void endMethod(int lastAddr) {
221 if(startOfMethod == 0) return;
222 // FEATURE: We should be able to use if(!unreachable) here (i think)
223 // This isn't strictly necessary; its just here to work around unreachable code errors
224 p("case " + toHex(lastAddr) + ":");
226 p("pc=" + constant(lastAddr) + ";");
230 p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(pc&0xffffffffL,16) + \" (got here from 0x\" + Long.toString(lastPC&0xffffffffL,16)+\")\");");
232 p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(pc&0xffffffffL,16));");
234 p("}"); // end switch
235 p("/* NOT REACHED */");
239 p("}"); // end method
240 endOfMethod = startOfMethod = 0;
243 private HashMap relativeAddrs = new HashMap();
244 private String constant(int target) {
245 if(target >= 4096 && lessConstants) {
246 int n = target & ~1023;
247 String var = "N_" + toHex8(n);
248 if(relativeAddrs.get(new Integer(n)) == null) {
249 relativeAddrs.put(new Integer(n),Boolean.TRUE);
250 classLevel.append(indents[1] + "private static int " + var + " = " + toHex(n) + ";\n");
252 return "(" + var + " + " + toHex(target - n) + ")";
254 return toHex(target);
258 private void branch(int pc, int target) {
259 if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
260 p("pc=" + constant(target) + ";");
262 p("throw new ExecutionException(\"Branch to addr 0x0\");");
263 else if((pc&methodMask) == (target&methodMask))
265 else if(assumeTailCalls)
266 p("run_" + Long.toString((target&methodMask)&0xffffffffL, 16) + "(); return;");
271 private void leaveMethod() {
275 private boolean textDone;
276 private void emitText(int addr, DataInputStream dis, int size) throws Exn,IOException {
277 if(textDone) throw new Exn("Multiple text segments");
280 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Section on weird boundaries");
282 int nextInsn = dis.readInt();
283 if(nextInsn == -1) throw new Error("Actually read -1 at " + toHex(addr));
286 for(int i=0;i<count;i++,addr+=4) {
288 nextInsn = (i == count-1) ? -1 : dis.readInt();
289 if(addr >= endOfMethod) { endMethod(); startMethod(addr); }
290 if(jumpableAddresses==null || addr == startOfMethod || jumpableAddresses.contains(new Integer(addr))) {
291 p("case " + toHex(addr) + ":");
293 } else if(unreachable) {
295 } else if(debugCompiler) {
296 p("/" + "* pc = " + toHex(addr) + "*" + "/");
299 emitInstruction(addr,insn,nextInsn);
307 private int initDataCount = 0;
308 private void emitData(int addr, DataInputStream dis, int size, boolean readOnly) throws Exn,IOException {
309 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Data section on weird boundaries");
310 int last = addr + size;
312 int segSize = Math.min(size,28000); // must be a multiple of 56
313 StringBuffer sb = new StringBuffer();
314 for(int i=0;i<segSize;i+=7) {
316 for(int j=0;j<7;j++) {
318 byte b = (i+j < size) ? dis.readByte() : 1;
321 for(int j=0;j<8;j++) {
322 char c = (char) ((l>>>(7*(7-j)))&0x7f);
323 if(c=='\n') sb.append("\\n");
324 else if(c=='\r') sb.append("\\r");
325 else if(c=='\\') sb.append("\\\\");
326 else if(c=='"') sb.append("\\\"");
327 else if(c >= 32 && c <= 126) sb.append(c);
328 else sb.append("\\" + toOctal3(c));
331 String varname = "_data" + (++initDataCount);
332 p("private static final int[] " + varname + " = decodeData(\"" + sb.toString() + "\"," + toHex(segSize/4) + ");");
333 inits.append(indents[2] + "initPages(" + varname +"," + toHex(addr) + "," + (readOnly?"true":"false") + ");\n");
340 private void emitBSS(int addr, int size) throws Exn {
341 if((addr&3)!=0) throw new Exn("BSS section on weird boundaries");
344 inits.append(indents[2] + "clearPages(" + toHex(addr) + "," + toHex(count) + ");\n");
347 // True if the current code path is unreachable (any instruction with a case statement is reachable)
348 private boolean unreachable = false;
350 private void emitInstruction(int pc, int insn, int nextInsn) throws IOException,Exn {
351 if(insn == -1) throw new Error("insn is -1");
353 int op = (insn >>> 26) & 0xff; // bits 26-31
354 int rs = (insn >>> 21) & 0x1f; // bits 21-25
355 int rt = (insn >>> 16) & 0x1f; // bits 16-20
356 int ft = (insn >>> 16) & 0x1f;
357 int rd = (insn >>> 11) & 0x1f; // bits 11-15
358 int fs = (insn >>> 11) & 0x1f;
359 int shamt = (insn >>> 6) & 0x1f; // bits 6-10
360 int fd = (insn >>> 6) & 0x1f;
361 int subcode = insn & 0x3f; // bits 0-5
363 int jumpTarget = (insn & 0x03ffffff); // bits 0-25
364 int unsignedImmediate = insn & 0xffff;
365 int signedImmediate = (insn << 16) >> 16;
366 int branchTarget = signedImmediate;
368 int tmp; // temporaries
370 //if(pc%64==0) p("System.err.println(\"Executing: " + toHex(pc) + "\");");
371 //p("/" + "*" + (pc == -1 ? "Delay Slot" : toHex(pc)) + " *" + "/ ");
372 if(pc==-1) p("/" + "* Next insn is delay slot *" + "/ ");
374 if(runtimeStats && op != 0) p("inc(\"opcode: " + op + "\");");
377 if(runtimeStats && insn != 0) p("inc(\"opcode: 0/" + subcode + "\");");
381 p( "r"+rd+" = r"+rt+" << "+shamt+";");
384 p( "r"+rd+" = r"+rt+" >>> "+shamt+";");
387 p( "r"+rd+" = r"+rt+" >> "+shamt+";");
390 p( "r"+rd+" = r"+rt+" << (r"+rs+"&0x1f);");
393 p( "r"+rd+" = r"+rt+" >>> (r"+rs+"&0x1f);");
396 p( "r"+rd+" = r"+rt+" >> (r"+rs+"&0x1f);");
399 if(pc == -1) throw new Error("pc modifying insn in delay slot");
400 emitInstruction(-1,nextInsn,-1);
401 if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
402 p("pc=r" + rs + ";");
407 if(pc == -1) throw new Error("pc modifying insn in delay slot");
408 emitInstruction(-1,nextInsn,-1);
409 if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
410 p("pc=r" + rs + ";");
411 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
416 p("pc = " + toHex(pc) + ";");
417 p( "r"+V0+" = syscall(r"+V0+",r"+A0+",r"+A1+",r"+A2+",r"+A3+");");
418 p("if (state != RUNNING) {");
420 p("pc = " + toHex(pc+4) + ";");
426 p( "throw new ExecutionException(\"Break\");");
441 p( "{ long hilo = (long)(r"+rs+") * ((long)r"+rt+"); " +
442 "hi = (int) (hilo >>> 32); " +
443 "lo = (int) hilo; }");
446 p( "{ long hilo = (r"+rs+" & 0xffffffffL) * (r"+rt+" & 0xffffffffL); " +
447 "hi = (int) (hilo >>> 32); " +
448 "lo = (int) hilo; } ");
451 p( "hi = r"+rs+"%r"+rt+"; lo = r"+rs+"/r"+rt+";");
454 p("if(r"+rt+"!=0) {");
455 p( "hi = (int)((r"+rs+" & 0xffffffffL) % (r"+rt+" & 0xffffffffL)); " +
456 "lo = (int)((r"+rs+" & 0xffffffffL) / (r"+rt+" & 0xffffffffL));");
460 throw new Exn("ADD (add with oveflow trap) not suported");
461 /*This must trap on overflow
462 p( "r"+rd+" = r"+rs+" + r"+rt+";");
465 p( "r"+rd+" = r"+rs+" + r"+rt+";");
468 throw new Exn("SUB (add with oveflow trap) not suported");
469 /*This must trap on overflow
470 p( "r"+rd+" = r"+rs+" - r"+rt+";");
473 p( "r"+rd+" = r"+rs+" - r"+rt+";");
476 p( "r"+rd+" = r"+rs+" & r"+rt+";");
479 p( "r"+rd+" = r"+rs+" | r"+rt+";");
482 p( "r"+rd+" = r"+rs+" ^ r"+rt+";");
485 p( "r"+rd+" = ~(r"+rs+" | r"+rt+");");
488 p( "r"+rd+" = r"+rs+" < r"+rt+" ? 1 : 0;");
491 p( "r"+rd+" = ((r"+rs+" & 0xffffffffL) < (r"+rt+" & 0xffffffffL)) ? 1 : 0;");
494 throw new RuntimeException("Illegal instruction 0/" + subcode);
501 if(pc == -1) throw new Error("pc modifying insn in delay slot");
502 p("if(r" + rs + " < 0) {");
504 emitInstruction(-1,nextInsn,-1);
505 branch(pc,pc+branchTarget*4+4);
510 if(pc == -1) throw new Error("pc modifying insn in delay slot");
511 p("if(r" + rs + " >= 0) {");
513 emitInstruction(-1,nextInsn,-1);
514 branch(pc,pc+branchTarget*4+4);
519 if(pc == -1) throw new Error("pc modifying insn in delay slot");
520 p("if(r" + rs + " < 0) {");
522 emitInstruction(-1,nextInsn,-1);
523 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
524 branch(pc,pc+branchTarget*4+4);
529 if(pc == -1) throw new Error("pc modifying insn in delay slot");
530 p("if(r" + rs + " >= 0) {");
532 emitInstruction(-1,nextInsn,-1);
533 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
534 branch(pc,pc+branchTarget*4+4);
539 throw new RuntimeException("Illegal Instruction 1/" + rt);
544 if(pc == -1) throw new Error("pc modifying insn in delay slot");
545 emitInstruction(-1,nextInsn,-1);
546 branch(pc,(pc&0xf0000000)|(jumpTarget << 2));
551 if(pc == -1) throw new Error("pc modifying insn in delay slot");
552 int target = (pc&0xf0000000)|(jumpTarget << 2);
553 emitInstruction(-1,nextInsn,-1);
554 if(optimizedMemcpy && (target == memcpy || target == memset)) {
556 p("memcpy(r4,r5,r6);");
557 else if(target == memset)
558 p("memset(r4,r5,r6);");
562 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
569 if(pc == -1) throw new Error("pc modifying insn in delay slot");
570 p("if(r" + rs + " == r" + rt + ") {");
572 emitInstruction(-1,nextInsn,-1);
573 branch(pc,pc+branchTarget*4+4);
578 if(pc == -1) throw new Error("pc modifying insn in delay slot");
579 p("if(r" + rs + " != r" + rt + ") {");
581 emitInstruction(-1,nextInsn,-1);
582 branch(pc,pc+branchTarget*4+4);
587 if(pc == -1) throw new Error("pc modifying insn in delay slot");
588 p("if(r" + rs + " <= 0) {");
590 emitInstruction(-1,nextInsn,-1);
591 branch(pc,pc+branchTarget*4+4);
596 if(pc == -1) throw new Error("pc modifying insn in delay slot");
597 p("if(r" + rs + " > 0) {");
599 emitInstruction(-1,nextInsn,-1);
600 branch(pc,pc+branchTarget*4+4);
605 p( "r"+rt+" = r"+rs+" + "+signedImmediate +";");
608 p( "r"+rt+" = r"+rs+" + "+signedImmediate+";");
611 p( "r"+rt+" = r"+rs+" < "+signedImmediate+" ? 1 : 0;");
614 p( "r"+rt+" = (r"+rs+"&0xffffffffL) < ("+unsignedImmediate+"&0xffffffffL) ? 1 : 0;");
617 p( "r"+rt+" = r"+rs+" & "+unsignedImmediate+";");
620 p( "r"+rt+" = r"+rs+" | "+unsignedImmediate+";");
623 p( "r"+rt+" = r"+rs+" ^ "+unsignedImmediate+";");
626 p( "r"+rt+" = "+unsignedImmediate+" << 16;");
629 throw new Exn("TLB/Exception support not implemented");
633 p( "r"+rt+" = f"+rd+";");
636 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
637 p( "r"+rt+" = fcsr;");
640 p( "f"+rd+" = r"+rt+";");
643 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
644 p( "fcsr = r"+rt+";");
646 case 8: {// BC1F, BC1T
648 p("if(((fcsr&0x800000)!=0) == (" + tmp + "!=0)) {");
650 emitInstruction(-1,nextInsn,-1);
651 branch(pc,pc+branchTarget*4+4);
659 p(setFloat(fd,getFloat(fs)+"+"+getFloat(ft)));
662 p(setFloat(fd,getFloat(fs)+"-"+getFloat(ft)));
665 p(setFloat(fd,getFloat(fs)+"*"+getFloat(ft)));
668 p(setFloat(fd,getFloat(fs)+"/"+getFloat(ft)));
671 p(setFloat(fd,"Math.abs("+getFloat(fs)+")"));
674 p("f"+fd+" = f"+fs+"; // MOV.S");
677 p(setFloat(fd,"-"+getFloat(fs)));
680 p(setDouble(fd,"(float)"+getFloat(fs)));
683 p("switch(fcsr & 3) {");
685 p("case 0: f"+fd+" = (int)Math.floor("+getFloat(fs)+"+0.5); break; // Round to nearest");
686 p("case 1: f"+fd+" = (int)"+getFloat(fs)+"; break; // Round towards zero");
687 p("case 2: f"+fd+" = (int)Math.ceil("+getFloat(fs)+"); break; // Round towards plus infinity");
688 p("case 3: f"+fd+" = (int)Math.floor("+getFloat(fs)+"); break; // Round towards minus infinity");
693 p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"=="+getFloat(ft)+") ? 0x800000 : 0x000000);");
696 p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"<"+getFloat(ft)+") ? 0x800000 : 0x000000);");
699 p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"<="+getFloat(ft)+") ? 0x800000 : 0x000000);");
701 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
708 p(setDouble(fd,getDouble(fs)+"+"+getDouble(ft)));
711 p(setDouble(fd,getDouble(fs)+"-"+getDouble(ft)));
714 p(setDouble(fd,getDouble(fs)+"*"+getDouble(ft)));
717 p(setDouble(fd,getDouble(fs)+"/"+getDouble(ft)));
720 p(setDouble(fd,"Math.abs("+getDouble(fs)+")"));
723 p("f"+fd+" = f"+fs+";");
724 p("f"+(fd+1)+" = f"+(fs+1)+";");
727 p(setDouble(fd,"-"+getDouble(fs)));
730 p(setFloat(fd,"(float)"+getDouble(fs)));
733 p("switch(fcsr & 3) {");
735 p("case 0: f"+fd+" = (int)Math.floor("+getDouble(fs)+"+0.5); break; // Round to nearest");
736 p("case 1: f"+fd+" = (int)"+getDouble(fs)+"; break; // Round towards zero");
737 p("case 2: f"+fd+" = (int)Math.ceil("+getDouble(fs)+"); break; // Round towards plus infinity");
738 p("case 3: f"+fd+" = (int)Math.floor("+getDouble(fs)+"); break; // Round towards minus infinity");
743 p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"=="+getDouble(ft)+") ? 0x800000 : 0x000000);");
746 p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"<"+getDouble(ft)+") ? 0x800000 : 0x000000);");
749 p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"<="+getDouble(ft)+") ? 0x800000 : 0x000000);");
751 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
755 case 20: { // Integer
759 p(setFloat(fd,"((float)f"+fs+")"));
762 p(setDouble(fd,"((double)f"+fs+")"));
764 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
769 throw new Exn("Invalid Instruction 17/" + rs);
774 throw new Exn("coprocessor 2 and 3 instructions not available");
776 if(runtimeStats) p("inc(\"LB\");");
777 p("addr=r" + rs +"+"+signedImmediate + ";");
778 memRead("addr","tmp");
779 p("tmp = (tmp>>>(((~addr)&3)<<3)) & 0xff;");
780 p("if((tmp&0x80)!=0) tmp |= 0xffffff00; /* sign extend */");
785 if(runtimeStats) p("inc(\"LH\");");
786 p("addr=r" + rs +"+"+signedImmediate + ";");
787 memRead("addr","tmp");
788 p("tmp = (tmp>>>(((~addr)&2)<<3)) & 0xffff;");
789 p("if((tmp&0x8000)!=0) tmp |= 0xffff0000; /* sign extend */");
794 p("addr=r" + rs +"+"+signedImmediate + ";");
795 memRead("addr","tmp");
796 p("r" + rt + " = (r"+rt+"&(0x00ffffff>>>(((~addr)&3)<<3)))|(tmp<<((addr&3)<<3));");
798 /*p("addr=r" + rs +"+"+signedImmediate + ";");
799 memRead("addr&~3","tmp");
800 p("switch(addr&3) {");
802 p("case 0: r"+rt+" = (r"+rt+"&0x00000000)|(tmp<< 0); break;");
803 p("case 1: r"+rt+" = (r"+rt+"&0x000000ff)|(tmp<< 8); break;");
804 p("case 2: r"+rt+" = (r"+rt+"&0x0000ffff)|(tmp<<16); break;");
805 p("case 3: r"+rt+" = (r"+rt+"&0x00ffffff)|(tmp<<24); break;");
811 if(runtimeStats) p("inc(\"LW\");");
812 memRead("r" + rs +"+"+signedImmediate,"r"+rt);
815 p("addr=r" + rs +"+"+signedImmediate + ";");
816 memRead("addr","tmp");
817 p("tmp = (tmp>>>(((~addr)&3)<<3)) & 0xff;");
822 p("addr=r" + rs +"+"+signedImmediate + ";");
823 memRead("addr","tmp");
824 p("tmp = (tmp>>>(((~addr)&2)<<3)) & 0xffff;");
829 p("addr=r" + rs +"+"+signedImmediate + ";");
830 memRead("addr","tmp");
831 p("r" + rt + " = (r"+rt+"&(0xffffff00<<((addr&3)<<3)))|(tmp>>>(((~addr)&3)<<3));");
834 /*p("addr=r" + rs +"+"+signedImmediate + ";");
835 memRead("addr&~3","tmp");
836 p("switch(addr&3) {");
838 p("case 0: r"+rt+" = (r"+rt+"&0xffffff00)|(tmp>>>24); break;");
839 p("case 1: r"+rt+" = (r"+rt+"&0xffff0000)|(tmp>>>16); break;");
840 p("case 2: r"+rt+" = (r"+rt+"&0xff000000)|(tmp>>> 8); break;");
841 p("case 3: r"+rt+" = (r"+rt+"&0x00000000)|(tmp>>> 0); break;");
848 if(runtimeStats) p("inc(\"SB\");");
849 p("addr=r" + rs +"+"+signedImmediate + ";");
850 memRead("addr","tmp");
851 p("tmp = (tmp&~(0xff000000>>>((addr&3)<<3)))|((r"+rt+"&0xff)<<(((~addr)&3)<<3));");
852 memWrite("addr","tmp");
856 if(runtimeStats) p("inc(\"SH\");");
857 p("addr=r" + rs +"+"+signedImmediate + ";");
858 memRead("addr","tmp");
859 p("tmp = (tmp&(0xffff<<((addr&2)<<3)))|((r" + rt + "&0xffff)<<(((~addr)&2)<<3));");
860 memWrite("addr","tmp");
865 p("addr=r" + rs +"+"+signedImmediate + ";");
866 memRead("addr","tmp");
867 p("tmp = (tmp&(0xffffff00<<(((~addr)&3)<<3)))|(r"+rt+">>>((addr&3)<<3));");
868 memWrite("addr","tmp");
872 if(runtimeStats) p("inc(\"SW\");");
873 memWrite("r"+rs+"+"+signedImmediate,"r" + rt);
877 p("addr=r" + rs +"+"+signedImmediate + ";");
878 memRead("addr","tmp");
879 p("tmp = (tmp&(0x00ffffff>>>((addr&3)<<3)))|(r"+rt+"<<(((~addr)&3)<<3));");
880 memWrite("addr","tmp");
883 // FEATURE: Need to be atomic if threads
885 memRead("r"+rs+"+"+signedImmediate,"r"+rt);
888 memRead("r"+rs+"+"+signedImmediate,"f"+rt);
890 // FEATURE: Needs to be atomic if threads
892 memWrite("r"+rs+"+"+signedImmediate,"r"+rt);
896 memWrite("r"+rs+"+"+signedImmediate,"f"+rt);
899 throw new Exn("Invalid Instruction: " + op + " at " + toHex(pc));
903 // Helper functions for emitText
904 // NOTE: memWrite and memRead MUST discard the last two bits of addr
905 private void memWrite(String addr, String target) {
906 if(nullPointerCheck) p("nullPointerCheck(" + addr + ");");
908 p("page[(" + addr + ")>>>2] = " + target + ";");
910 p("writePages[("+addr+")>>>"+pageShift+"][(("+addr+")>>>2)&"+toHex((pageSize>>2)-1)+"] = " + target + ";");
912 p("unsafeMemWrite(" + addr + "," + target + ");");
914 private void memRead(String addr, String target) {
915 if(nullPointerCheck) p("nullPointerCheck(" + addr + ");");
917 p(target + "= page[(" + addr + ")>>>2];");
919 p(target + " = readPages[("+addr+")>>>"+pageShift+"][(("+addr+")>>>2)&"+toHex((pageSize>>2)-1)+"];");
921 p(target + " = unsafeMemRead(" + addr + ");");
923 private static String getFloat(int r) { return "(Float.intBitsToFloat(f"+r+"))"; }
924 private static String getDouble(int r) {
925 return "(Double.longBitsToDouble(((f"+(r+1)+"&0xffffffffL) << 32) | (f"+r+"&0xffffffffL)))";
927 private static String setFloat(int r, String expr) { return "f"+r+"=Float.floatToRawIntBits("+expr+");"; }
928 private static String setDouble(int r, String expr) {
929 return "{ long l = Double.doubleToLongBits("+expr+"); "+
930 "f"+(r+1)+" = (int)(l >>> 32); f"+r+" = (int)l; }";