1 package org.ibex.nestedvm;
5 import org.ibex.nestedvm.util.*;
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(Seekable binary, String className, Writer w) throws IOException {
31 super(binary,className);
32 out = new PrintWriter(w);
35 protected void _go() throws Exn, IOException {
36 if(singleFloat) throw new Exn("JavaSourceCompiler doesn't support singleFloat");
39 if (fullClassName.indexOf('.') != -1) {
40 packageName = fullClassName.substring(0, fullClassName.lastIndexOf('.'));
41 className = fullClassName.substring(fullClassName.lastIndexOf('.') + 1);
43 className = fullClassName;
47 p("/* This file was generated from " + source + " by Mips2Java on " + dateTime() + " */");
48 if (packageName != null) p("package " + packageName + ";");
49 if(runtimeStats) p("import java.util.*;");
51 p("public final class " + className + " extends " + runtimeClass + " {");
54 p("/* program counter */");
55 p("private int pc = 0;");
57 p("private int lastPC = 0;");
59 p("/* General Purpose registers */");
60 p("private final static int r0 = 0;");
61 p("private int r1, r2, r3, r4, r5, r6, r7,");
62 p(" r8, r9, r10, r11, r12, r13, r14, r15,");
63 p(" r16, r17, r18, r19, r20, r21, r22, r23,");
64 p(" r24, r25, r26, r27, r28, r29, r30, r31,");
65 p(" hi = 0, lo = 0;");
66 p("/* FP registers */");
67 p("private int f0, f1, f2, f3, f4, f5, f6, f7,");
68 p(" f8, f9, f10, f11, f12, f13, f14, f15,");
69 p(" f16, f17, f18, f19, f20, f21, f22, f23,");
70 p(" f24, f25, f26, f27, f28, f29, f30, f31;");
71 p("/* FP Control Register */");
72 p("private int fcsr = 0;");
75 if(onePage) p("private final int[] page = readPages[0];");
77 // Generate main body functions (run_XXXX() blocks, _data[] arrays, etc)
80 for(int i=0;i<elf.sheaders.length;i++) {
81 ELF.SHeader sheader = elf.sheaders[i];
82 String name = sheader.name;
83 // if this section doesn't get loaded into our address space don't worry about it
84 if(sheader.addr == 0x0) continue;
86 highestAddr = Math.max(highestAddr, sheader.addr + sheader.size);
88 if(name.equals(".text"))
89 emitText(sheader.addr, new DataInputStream(sheader.getInputStream()),sheader.size);
90 else if(name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"))
91 emitData(sheader.addr, new DataInputStream(sheader.getInputStream()), sheader.size,name.equals(".rodata"));
92 else if(name.equals(".bss") || name.equals(".sbss"))
93 emitBSS(sheader.addr,sheader.size);
95 throw new Exn("Unknown segment: " + name);
102 // Trampoline (dispatch calls to the appropriate run_XXX() methods
103 p("private final void trampoline() throws ExecutionException {");
105 p("while(state == RUNNING) {");
107 p("switch(pc>>>" + methodShift+ ") {");
108 //p("switch(pc&" + toHex(methodMask) + ") {");
111 p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(this.pc&0xffffffffL,16) + \": r2: \" + r2);");
118 p("public " + className + "() {");
120 p("super(" + pageSize + "," + totalPages + ");");
126 p("protected int entryPoint() { return " + toHex(elf.header.entry) + "; }");
127 p("protected int heapStart() { return " + toHex(highestAddr) + "; }");
128 p("protected int gp() { return " + toHex(gp.addr) + "; }");
129 if(userInfo != null) {
130 p("protected int userInfoBase() { return " + toHex(userInfo.addr) + "; }");
131 p("protected int userInfoSize() { return " + toHex(userInfo.size) + "; }");
135 p("public static void main(String[] args) throws Exception {");
137 p("" + className + " me = new " + className + "();");
138 p("int status = me.run(\"" + fullClassName + "\",args);");
139 if(runtimeStats) p("me.printStats();");
140 p("System.exit(status);");
145 // Runtime abstract methods
146 p("protected void _execute() throws ExecutionException { trampoline(); }");
149 p("protected void setCPUState(CPUState state) {");
151 for(int i=1;i<32;i++) p("r" + i + "=state.r[" + i + "];");
152 for(int i=0;i<32;i++) p("f" + i + "=state.f[" + i + "];");
153 p("hi=state.hi; lo=state.lo; fcsr=state.fcsr;");
157 p("protected void getCPUState(CPUState state) {");
159 for(int i=1;i<32;i++) p("state.r[" + i + "]=r" + i+ ";");
160 for(int i=0;i<32;i++) p("state.f[" + i + "]=f" + i +";");
161 p("state.hi=hi; state.lo=lo; state.fcsr=fcsr;");
168 p("private static final " + hashClass + " symbols = new " + hashClass + "();");
171 ELF.Symbol[] symbols = elf.getSymtab().symbols;
172 for(int i=0;i<symbols.length;i++) {
173 ELF.Symbol s = symbols[i];
174 if(s.type == ELF.Symbol.STT_FUNC && s.binding == ELF.Symbol.STB_GLOBAL && (s.name.equals("_call_helper") || !s.name.startsWith("_")))
175 p("symbols.put(\"" + s.name + "\",new Integer(" + toHex(s.addr) + "));");
179 p("public int lookupSymbol(String symbol) { Integer i = (Integer) symbols.get(symbol); return i==null ? -1 : i.intValue(); }");
185 p("private HashMap counters = new HashMap();");
186 p("private void inc(String k) { Long i = (Long)counters.get(k); counters.put(k,new Long(i==null ? 1 : i.longValue() + 1)); }");
187 p("private void printStats() {");
188 p(" Iterator i = new TreeSet(counters.keySet()).iterator();");
189 p(" while(i.hasNext()) { Object o = i.next(); System.err.println(\"\" + o + \": \" + counters.get(o)); }");
198 private int startOfMethod = 0;
199 private int endOfMethod = 0;
201 private void startMethod(int addr) {
202 addr &= ~(maxBytesPerMethod-1);
203 startOfMethod = addr;
204 endOfMethod = addr + maxBytesPerMethod;
205 String methodName = "run_" + Long.toString(addr & 0xffffffffL, 16);
206 runs.append(indents[4] + "case " + toHex(addr>>>methodShift) + ": " + methodName + "(); break; \n");
207 //runs.append(indents[4] + "case " + toHex(addr&methodMask) + ": " + methodName + "(); break; \n");
209 p("private final void " + methodName + "() throws ExecutionException { /"+"* " + toHex(addr) + " - " + toHex(endOfMethod) + " *" + "/");
218 private void endMethod() { endMethod(endOfMethod); }
219 private void endMethod(int lastAddr) {
220 if(startOfMethod == 0) return;
221 // We should be able to use if(!unreachable) here (i think)
222 // This isn't strictly necessary; its just here to work around unreachable code errors
223 p("case " + toHex(lastAddr) + ":");
225 p("pc=" + constant(lastAddr) + ";");
229 p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(pc&0xffffffffL,16) + \" (got here from 0x\" + Long.toString(lastPC&0xffffffffL,16)+\")\");");
231 p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(pc&0xffffffffL,16));");
233 p("}"); // end switch
234 p("/* NOT REACHED */");
238 p("}"); // end method
239 endOfMethod = startOfMethod = 0;
242 private HashMap relativeAddrs = new HashMap();
243 private String constant(int target) {
244 if(target >= 4096 && lessConstants) {
245 int n = target & ~1023;
246 String var = "N_" + toHex8(n);
247 if(relativeAddrs.get(new Integer(n)) == null) {
248 relativeAddrs.put(new Integer(n),Boolean.TRUE);
249 classLevel.append(indents[1] + "private static int " + var + " = " + toHex(n) + ";\n");
251 return "(" + var + " + " + toHex(target - n) + ")";
253 return toHex(target);
257 private void branch(int pc, int target) {
258 if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
259 p("pc=" + constant(target) + ";");
261 p("throw new ExecutionException(\"Branch to addr 0x0\");");
262 else if((pc&methodMask) == (target&methodMask))
264 else if(assumeTailCalls)
265 p("run_" + Long.toString((target&methodMask)&0xffffffffL, 16) + "(); return;");
270 private void leaveMethod() {
274 private boolean textDone;
275 private void emitText(int addr, DataInputStream dis, int size) throws Exn,IOException {
276 if(textDone) throw new Exn("Multiple text segments");
279 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Section on weird boundaries");
281 int nextInsn = dis.readInt();
282 if(nextInsn == -1) throw new Error("Actually read -1 at " + toHex(addr));
285 for(int i=0;i<count;i++,addr+=4) {
287 nextInsn = (i == count-1) ? -1 : dis.readInt();
288 if(addr >= endOfMethod) { endMethod(); startMethod(addr); }
289 if(jumpableAddresses==null || addr == startOfMethod || jumpableAddresses.contains(new Integer(addr))) {
290 p("case " + toHex(addr) + ":");
292 } else if(unreachable) {
294 } else if(debugCompiler) {
295 p("/" + "* pc = " + toHex(addr) + "*" + "/");
298 emitInstruction(addr,insn,nextInsn);
306 private int initDataCount = 0;
307 private void emitData(int addr, DataInputStream dis, int size, boolean readOnly) throws Exn,IOException {
308 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Data section on weird boundaries");
309 int last = addr + size;
311 int segSize = Math.min(size,28000); // must be a multiple of 56
312 StringBuffer sb = new StringBuffer();
313 for(int i=0;i<segSize;i+=7) {
315 for(int j=0;j<7;j++) {
317 byte b = (i+j < size) ? dis.readByte() : 1;
320 for(int j=0;j<8;j++) {
321 char c = (char) ((l>>>(7*(7-j)))&0x7f);
322 if(c=='\n') sb.append("\\n");
323 else if(c=='\r') sb.append("\\r");
324 else if(c=='\\') sb.append("\\\\");
325 else if(c=='"') sb.append("\\\"");
326 else if(c >= 32 && c <= 126) sb.append(c);
327 else sb.append("\\" + toOctal3(c));
330 String varname = "_data" + (++initDataCount);
331 p("private static final int[] " + varname + " = decodeData(\"" + sb.toString() + "\"," + toHex(segSize/4) + ");");
332 inits.append(indents[2] + "initPages(" + varname +"," + toHex(addr) + "," + (readOnly?"true":"false") + ");\n");
339 private void emitBSS(int addr, int size) throws Exn {
340 if((addr&3)!=0) throw new Exn("BSS section on weird boundaries");
343 inits.append(indents[2] + "clearPages(" + toHex(addr) + "," + toHex(count) + ");\n");
346 // True if the current code path is unreachable (any instruction with a case statement is reachable)
347 private boolean unreachable = false;
349 private void emitInstruction(int pc, int insn, int nextInsn) throws IOException,Exn {
350 if(insn == -1) throw new Error("insn is -1");
352 int op = (insn >>> 26) & 0xff; // bits 26-31
353 int rs = (insn >>> 21) & 0x1f; // bits 21-25
354 int rt = (insn >>> 16) & 0x1f; // bits 16-20
355 int ft = (insn >>> 16) & 0x1f;
356 int rd = (insn >>> 11) & 0x1f; // bits 11-15
357 int fs = (insn >>> 11) & 0x1f;
358 int shamt = (insn >>> 6) & 0x1f; // bits 6-10
359 int fd = (insn >>> 6) & 0x1f;
360 int subcode = insn & 0x3f; // bits 0-5
362 int jumpTarget = (insn & 0x03ffffff); // bits 0-25
363 int unsignedImmediate = insn & 0xffff;
364 int signedImmediate = (insn << 16) >> 16;
365 int branchTarget = signedImmediate;
367 int tmp; // temporaries
369 //if(pc%64==0) p("System.err.println(\"Executing: " + toHex(pc) + "\");");
370 //p("/" + "*" + (pc == -1 ? "Delay Slot" : toHex(pc)) + " *" + "/ ");
371 if(pc==-1) p("/" + "* Next insn is delay slot *" + "/ ");
373 if(runtimeStats && op != 0) p("inc(\"opcode: " + op + "\");");
376 if(runtimeStats && insn != 0) p("inc(\"opcode: 0/" + subcode + "\");");
380 p( "r"+rd+" = r"+rt+" << "+shamt+";");
383 p( "r"+rd+" = r"+rt+" >>> "+shamt+";");
386 p( "r"+rd+" = r"+rt+" >> "+shamt+";");
389 p( "r"+rd+" = r"+rt+" << (r"+rs+"&0x1f);");
392 p( "r"+rd+" = r"+rt+" >>> (r"+rs+"&0x1f);");
395 p( "r"+rd+" = r"+rt+" >> (r"+rs+"&0x1f);");
398 if(pc == -1) throw new Error("pc modifying insn in delay slot");
399 emitInstruction(-1,nextInsn,-1);
400 if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
401 p("pc=r" + rs + ";");
406 if(pc == -1) throw new Error("pc modifying insn in delay slot");
407 emitInstruction(-1,nextInsn,-1);
408 if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
409 p("pc=r" + rs + ";");
410 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
415 p("pc = " + toHex(pc) + ";");
416 p( "r"+V0+" = syscall(r"+V0+",r"+A0+",r"+A1+",r"+A2+",r"+A3+",r"+T0+",r"+T1+");");
417 p("if (state != RUNNING) {");
419 p("pc = " + toHex(pc+4) + ";");
425 p( "throw new ExecutionException(\"Break\");");
440 p( "{ long hilo = (long)(r"+rs+") * ((long)r"+rt+"); " +
441 "hi = (int) (hilo >>> 32); " +
442 "lo = (int) hilo; }");
445 p( "{ long hilo = (r"+rs+" & 0xffffffffL) * (r"+rt+" & 0xffffffffL); " +
446 "hi = (int) (hilo >>> 32); " +
447 "lo = (int) hilo; } ");
450 p( "hi = r"+rs+"%r"+rt+"; lo = r"+rs+"/r"+rt+";");
453 p("if(r"+rt+"!=0) {");
454 p( "hi = (int)((r"+rs+" & 0xffffffffL) % (r"+rt+" & 0xffffffffL)); " +
455 "lo = (int)((r"+rs+" & 0xffffffffL) / (r"+rt+" & 0xffffffffL));");
459 throw new Exn("ADD (add with oveflow trap) not suported");
460 /*This must trap on overflow
461 p( "r"+rd+" = r"+rs+" + r"+rt+";");
464 p( "r"+rd+" = r"+rs+" + r"+rt+";");
467 throw new Exn("SUB (add with oveflow trap) not suported");
468 /*This must trap on overflow
469 p( "r"+rd+" = r"+rs+" - r"+rt+";");
472 p( "r"+rd+" = r"+rs+" - r"+rt+";");
475 p( "r"+rd+" = r"+rs+" & r"+rt+";");
478 p( "r"+rd+" = r"+rs+" | r"+rt+";");
481 p( "r"+rd+" = r"+rs+" ^ r"+rt+";");
484 p( "r"+rd+" = ~(r"+rs+" | r"+rt+");");
487 p( "r"+rd+" = r"+rs+" < r"+rt+" ? 1 : 0;");
490 p( "r"+rd+" = ((r"+rs+" & 0xffffffffL) < (r"+rt+" & 0xffffffffL)) ? 1 : 0;");
493 throw new RuntimeException("Illegal instruction 0/" + subcode);
500 if(pc == -1) throw new Error("pc modifying insn in delay slot");
501 p("if(r" + rs + " < 0) {");
503 emitInstruction(-1,nextInsn,-1);
504 branch(pc,pc+branchTarget*4+4);
509 if(pc == -1) throw new Error("pc modifying insn in delay slot");
510 p("if(r" + rs + " >= 0) {");
512 emitInstruction(-1,nextInsn,-1);
513 branch(pc,pc+branchTarget*4+4);
518 if(pc == -1) throw new Error("pc modifying insn in delay slot");
519 p("if(r" + rs + " < 0) {");
521 emitInstruction(-1,nextInsn,-1);
522 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
523 branch(pc,pc+branchTarget*4+4);
528 if(pc == -1) throw new Error("pc modifying insn in delay slot");
529 p("if(r" + rs + " >= 0) {");
531 emitInstruction(-1,nextInsn,-1);
532 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
533 branch(pc,pc+branchTarget*4+4);
538 throw new RuntimeException("Illegal Instruction 1/" + rt);
543 if(pc == -1) throw new Error("pc modifying insn in delay slot");
544 emitInstruction(-1,nextInsn,-1);
545 branch(pc,(pc&0xf0000000)|(jumpTarget << 2));
550 if(pc == -1) throw new Error("pc modifying insn in delay slot");
551 int target = (pc&0xf0000000)|(jumpTarget << 2);
552 emitInstruction(-1,nextInsn,-1);
553 p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
559 if(pc == -1) throw new Error("pc modifying insn in delay slot");
560 p("if(r" + rs + " == r" + rt + ") {");
562 emitInstruction(-1,nextInsn,-1);
563 branch(pc,pc+branchTarget*4+4);
568 if(pc == -1) throw new Error("pc modifying insn in delay slot");
569 p("if(r" + rs + " != r" + rt + ") {");
571 emitInstruction(-1,nextInsn,-1);
572 branch(pc,pc+branchTarget*4+4);
577 if(pc == -1) throw new Error("pc modifying insn in delay slot");
578 p("if(r" + rs + " <= 0) {");
580 emitInstruction(-1,nextInsn,-1);
581 branch(pc,pc+branchTarget*4+4);
586 if(pc == -1) throw new Error("pc modifying insn in delay slot");
587 p("if(r" + rs + " > 0) {");
589 emitInstruction(-1,nextInsn,-1);
590 branch(pc,pc+branchTarget*4+4);
595 p( "r"+rt+" = r"+rs+" + "+signedImmediate +";");
598 p( "r"+rt+" = r"+rs+" + "+signedImmediate+";");
601 p( "r"+rt+" = r"+rs+" < "+signedImmediate+" ? 1 : 0;");
604 p( "r"+rt+" = (r"+rs+"&0xffffffffL) < ("+signedImmediate+"&0xffffffffL) ? 1 : 0;");
607 p( "r"+rt+" = r"+rs+" & "+unsignedImmediate+";");
610 p( "r"+rt+" = r"+rs+" | "+unsignedImmediate+";");
613 p( "r"+rt+" = r"+rs+" ^ "+unsignedImmediate+";");
616 p( "r"+rt+" = "+unsignedImmediate+" << 16;");
619 throw new Exn("TLB/Exception support not implemented");
623 p( "r"+rt+" = f"+rd+";");
626 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
627 p( "r"+rt+" = fcsr;");
630 p( "f"+rd+" = r"+rt+";");
633 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
634 p( "fcsr = r"+rt+";");
636 case 8: {// BC1F, BC1T
638 p("if(((fcsr&0x800000)!=0) == (" + tmp + "!=0)) {");
640 emitInstruction(-1,nextInsn,-1);
641 branch(pc,pc+branchTarget*4+4);
649 p(setFloat(fd,getFloat(fs)+"+"+getFloat(ft)));
652 p(setFloat(fd,getFloat(fs)+"-"+getFloat(ft)));
655 p(setFloat(fd,getFloat(fs)+"*"+getFloat(ft)));
658 p(setFloat(fd,getFloat(fs)+"/"+getFloat(ft)));
661 p(setFloat(fd,"Math.abs("+getFloat(fs)+")"));
664 p("f"+fd+" = f"+fs+"; // MOV.S");
667 p(setFloat(fd,"-"+getFloat(fs)));
670 p(setDouble(fd,"(float)"+getFloat(fs)));
673 p("switch(fcsr & 3) {");
675 p("case 0: f"+fd+" = (int)Math.floor("+getFloat(fs)+"+0.5); break; // Round to nearest");
676 p("case 1: f"+fd+" = (int)"+getFloat(fs)+"; break; // Round towards zero");
677 p("case 2: f"+fd+" = (int)Math.ceil("+getFloat(fs)+"); break; // Round towards plus infinity");
678 p("case 3: f"+fd+" = (int)Math.floor("+getFloat(fs)+"); break; // Round towards minus infinity");
683 p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"=="+getFloat(ft)+") ? 0x800000 : 0x000000);");
686 p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"<"+getFloat(ft)+") ? 0x800000 : 0x000000);");
689 p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"<="+getFloat(ft)+") ? 0x800000 : 0x000000);");
691 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
698 p(setDouble(fd,getDouble(fs)+"+"+getDouble(ft)));
701 p(setDouble(fd,getDouble(fs)+"-"+getDouble(ft)));
704 p(setDouble(fd,getDouble(fs)+"*"+getDouble(ft)));
707 p(setDouble(fd,getDouble(fs)+"/"+getDouble(ft)));
710 p(setDouble(fd,"Math.abs("+getDouble(fs)+")"));
713 p("f"+fd+" = f"+fs+";");
714 p("f"+(fd+1)+" = f"+(fs+1)+";");
717 p(setDouble(fd,"-"+getDouble(fs)));
720 p(setFloat(fd,"(float)"+getDouble(fs)));
723 p("switch(fcsr & 3) {");
725 p("case 0: f"+fd+" = (int)Math.floor("+getDouble(fs)+"+0.5); break; // Round to nearest");
726 p("case 1: f"+fd+" = (int)"+getDouble(fs)+"; break; // Round towards zero");
727 p("case 2: f"+fd+" = (int)Math.ceil("+getDouble(fs)+"); break; // Round towards plus infinity");
728 p("case 3: f"+fd+" = (int)Math.floor("+getDouble(fs)+"); break; // Round towards minus infinity");
733 p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"=="+getDouble(ft)+") ? 0x800000 : 0x000000);");
736 p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"<"+getDouble(ft)+") ? 0x800000 : 0x000000);");
739 p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"<="+getDouble(ft)+") ? 0x800000 : 0x000000);");
741 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
745 case 20: { // Integer
749 p(setFloat(fd,"((float)f"+fs+")"));
752 p(setDouble(fd,"((double)f"+fs+")"));
754 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
759 throw new Exn("Invalid Instruction 17/" + rs);
764 throw new Exn("coprocessor 2 and 3 instructions not available");
766 if(runtimeStats) p("inc(\"LB\");");
767 p("addr=r" + rs +"+"+signedImmediate + ";");
768 memRead("addr","tmp");
769 p("tmp = (tmp>>>(((~addr)&3)<<3)) & 0xff;");
770 p("if((tmp&0x80)!=0) tmp |= 0xffffff00; /* sign extend */");
775 if(runtimeStats) p("inc(\"LH\");");
776 p("addr=r" + rs +"+"+signedImmediate + ";");
777 memRead("addr","tmp");
778 p("tmp = (tmp>>>(((~addr)&2)<<3)) & 0xffff;");
779 p("if((tmp&0x8000)!=0) tmp |= 0xffff0000; /* sign extend */");
784 p("addr=r" + rs +"+"+signedImmediate + ";");
785 memRead("addr","tmp");
786 p("r" + rt + " = (r"+rt+"&(0x00ffffff>>>(((~addr)&3)<<3)))|(tmp<<((addr&3)<<3));");
788 /*p("addr=r" + rs +"+"+signedImmediate + ";");
789 memRead("addr&~3","tmp");
790 p("switch(addr&3) {");
792 p("case 0: r"+rt+" = (r"+rt+"&0x00000000)|(tmp<< 0); break;");
793 p("case 1: r"+rt+" = (r"+rt+"&0x000000ff)|(tmp<< 8); break;");
794 p("case 2: r"+rt+" = (r"+rt+"&0x0000ffff)|(tmp<<16); break;");
795 p("case 3: r"+rt+" = (r"+rt+"&0x00ffffff)|(tmp<<24); break;");
801 if(runtimeStats) p("inc(\"LW\");");
802 memRead("r" + rs +"+"+signedImmediate,"r"+rt);
805 p("addr=r" + rs +"+"+signedImmediate + ";");
806 memRead("addr","tmp");
807 p("tmp = (tmp>>>(((~addr)&3)<<3)) & 0xff;");
812 p("addr=r" + rs +"+"+signedImmediate + ";");
813 memRead("addr","tmp");
814 p("tmp = (tmp>>>(((~addr)&2)<<3)) & 0xffff;");
819 p("addr=r" + rs +"+"+signedImmediate + ";");
820 memRead("addr","tmp");
821 p("r" + rt + " = (r"+rt+"&(0xffffff00<<((addr&3)<<3)))|(tmp>>>(((~addr)&3)<<3));");
824 /*p("addr=r" + rs +"+"+signedImmediate + ";");
825 memRead("addr&~3","tmp");
826 p("switch(addr&3) {");
828 p("case 0: r"+rt+" = (r"+rt+"&0xffffff00)|(tmp>>>24); break;");
829 p("case 1: r"+rt+" = (r"+rt+"&0xffff0000)|(tmp>>>16); break;");
830 p("case 2: r"+rt+" = (r"+rt+"&0xff000000)|(tmp>>> 8); break;");
831 p("case 3: r"+rt+" = (r"+rt+"&0x00000000)|(tmp>>> 0); break;");
838 if(runtimeStats) p("inc(\"SB\");");
839 p("addr=r" + rs +"+"+signedImmediate + ";");
840 memRead("addr","tmp");
841 p("tmp = (tmp&~(0xff000000>>>((addr&3)<<3)))|((r"+rt+"&0xff)<<(((~addr)&3)<<3));");
842 memWrite("addr","tmp");
846 if(runtimeStats) p("inc(\"SH\");");
847 p("addr=r" + rs +"+"+signedImmediate + ";");
848 memRead("addr","tmp");
849 p("tmp = (tmp&(0xffff<<((addr&2)<<3)))|((r" + rt + "&0xffff)<<(((~addr)&2)<<3));");
850 memWrite("addr","tmp");
855 p("addr=r" + rs +"+"+signedImmediate + ";");
856 memRead("addr","tmp");
857 p("tmp = (tmp&(0xffffff00<<(((~addr)&3)<<3)))|(r"+rt+">>>((addr&3)<<3));");
858 memWrite("addr","tmp");
862 if(runtimeStats) p("inc(\"SW\");");
863 memWrite("r"+rs+"+"+signedImmediate,"r" + rt);
867 p("addr=r" + rs +"+"+signedImmediate + ";");
868 memRead("addr","tmp");
869 p("tmp = (tmp&(0x00ffffff>>>((addr&3)<<3)))|(r"+rt+"<<(((~addr)&3)<<3));");
870 memWrite("addr","tmp");
873 // Need to be atomic if threads
875 memRead("r"+rs+"+"+signedImmediate,"r"+rt);
878 memRead("r"+rs+"+"+signedImmediate,"f"+rt);
880 // Needs to be atomic if threads
882 memWrite("r"+rs+"+"+signedImmediate,"r"+rt);
886 memWrite("r"+rs+"+"+signedImmediate,"f"+rt);
889 throw new Exn("Invalid Instruction: " + op + " at " + toHex(pc));
893 // Helper functions for emitText
894 // NOTE: memWrite and memRead MUST discard the last two bits of addr
895 private void memWrite(String addr, String target) {
896 if(nullPointerCheck) p("nullPointerCheck(" + addr + ");");
898 p("page[(" + addr + ")>>>2] = " + target + ";");
900 p("writePages[("+addr+")>>>"+pageShift+"][(("+addr+")>>>2)&"+toHex((pageSize>>2)-1)+"] = " + target + ";");
902 p("unsafeMemWrite(" + addr + "," + target + ");");
904 private void memRead(String addr, String target) {
905 if(nullPointerCheck) p("nullPointerCheck(" + addr + ");");
907 p(target + "= page[(" + addr + ")>>>2];");
909 p(target + " = readPages[("+addr+")>>>"+pageShift+"][(("+addr+")>>>2)&"+toHex((pageSize>>2)-1)+"];");
911 p(target + " = unsafeMemRead(" + addr + ");");
913 private static String getFloat(int r) { return "(Float.intBitsToFloat(f"+r+"))"; }
914 private static String getDouble(int r) {
915 return "(Double.longBitsToDouble(((f"+(r+1)+"&0xffffffffL) << 32) | (f"+r+"&0xffffffffL)))";
917 private static String setFloat(int r, String expr) { return "f"+r+"=Float.floatToRawIntBits("+expr+");"; }
918 private static String setDouble(int r, String expr) {
919 return "{ long l = Double.doubleToLongBits("+expr+"); "+
920 "f"+(r+1)+" = (int)(l >>> 32); f"+r+" = (int)l; }";