1 package org.ibex.nestedvm;
5 import org.ibex.nestedvm.util.*;
6 import org.ibex.classgen.*;
8 // FEATURE: Eliminate unnecessary use of SWAP
10 /* FEATURE: Span large binaries across several classfiles
11 * We should be able to do this with no performance penalty
12 * Every method in the inner classes is static and takes the main class as an arg
13 * This makes them look just like methods in the main class because arg1 gets loaded into
17 /* FEATURE: smarter with local regs
18 * Be even smarter with the use of local registers. We need to only load fields into
19 * local regs when they are actually used and only write to fields if the regs could have
20 * changed. This should allow us to put more regs in local vars. Right now putting all used
21 * regs local vars makes code like this slower.
23 * void work(int a, int b) {
30 * Because all the regs used in "real work" are loaded/restored even for fast path
34 public class ClassFileCompiler extends Compiler implements CGConst {
35 /** The stream to write the compiled output to */
36 private OutputStream os;
37 private PrintStream warn = System.err;
40 private MethodGen clinit;
41 private MethodGen init;
42 private Type.Object me;
43 private Type.Object superClass;
45 public ClassFileCompiler(String path, String className, OutputStream os) throws IOException { this(new Seekable.File(path),className,os); }
46 public ClassFileCompiler(Seekable binary, String className, OutputStream os) throws IOException {
47 super(binary,className);
51 public void setWarnWriter(PrintStream warn) { this.warn = warn; }
53 protected void _go() throws Exn, IOException {
56 } catch(ClassGen.Exn e) {
57 e.printStackTrace(warn);
58 throw new Exn("Class generation exception: " + e.toString());
62 private void __go() throws Exn, IOException {
63 if(!pruneCases) throw new Exn("-o prunecases MUST be enabled for ClassFileCompiler");
66 me = new Type.Object(fullClassName);
67 superClass = new Type.Object(runtimeClass);
68 cg = new ClassGen(me,superClass,ACC_PUBLIC|ACC_FINAL|ACC_SUPER);
69 if(source != null) cg.setSourceFile(source);
72 cg.addField("pc",Type.INT,ACC_PRIVATE);
73 cg.addField("hi",Type.INT,ACC_PRIVATE);
74 cg.addField("lo",Type.INT,ACC_PRIVATE);
75 cg.addField("fcsr",Type.INT,ACC_PRIVATE);
76 for(int i=1;i<32;i++) cg.addField("r" + i,Type.INT,ACC_PRIVATE);
77 for(int i=0;i<32;i++) cg.addField("f" + i,singleFloat ? Type.FLOAT : Type.INT,ACC_PRIVATE);
79 clinit = cg.addMethod("<clinit>",Type.VOID,Type.NO_ARGS,ACC_PRIVATE|ACC_STATIC);
81 init = cg.addMethod("<init>",Type.VOID,Type.NO_ARGS,ACC_PUBLIC);
83 init.add(LDC,pageSize);
84 init.add(LDC,totalPages);
85 init.add(INVOKESPECIAL,new MethodRef(me,"<init>",Type.VOID,new Type[]{Type.INT,Type.INT}));
88 init = cg.addMethod("<init>",Type.VOID,new Type[]{Type.INT,Type.INT},ACC_PUBLIC);
92 init.add(INVOKESPECIAL,new MethodRef(superClass,"<init>",Type.VOID,new Type[]{Type.INT,Type.INT}));
95 cg.addField("page",Type.arrayType(Type.INT),ACC_PRIVATE|ACC_FINAL);
98 init.add(GETFIELD,new FieldRef(me,"readPages",Type.arrayType(Type.INT,2)));
101 init.add(PUTFIELD,new FieldRef(me,"page",Type.arrayType(Type.INT)));
105 cg.addField("symbols",new Type.Object(hashClass),ACC_PRIVATE|ACC_STATIC|ACC_FINAL);
109 for(int i=0;i<elf.sheaders.length;i++) {
110 ELF.SHeader sheader = elf.sheaders[i];
111 String name = sheader.name;
112 // if this section doesn't get loaded into our address space don't worry about it
113 if(sheader.addr == 0x0) continue;
115 highestAddr = Math.max(highestAddr, sheader.addr + sheader.size);
117 if(name.equals(".text"))
118 emitText(sheader.addr, new DataInputStream(sheader.getInputStream()),sheader.size);
119 else if(name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"))
120 emitData(sheader.addr, new DataInputStream(sheader.getInputStream()), sheader.size,name.equals(".rodata"));
121 else if(name.equals(".bss") || name.equals(".sbss"))
122 emitBSS(sheader.addr,sheader.size);
124 throw new Exn("Unknown segment: " + name);
132 Type.Object hash = new Type.Object(hashClass);
133 clinit.add(NEW,hash);
136 clinit.add(INVOKESPECIAL,new MethodRef(hash,"<init>",Type.VOID,Type.NO_ARGS));
137 clinit.add(PUTSTATIC,new FieldRef(me,"symbols",hash));
138 ELF.Symbol[] symbols = elf.getSymtab().symbols;
139 for(int i=0;i<symbols.length;i++) {
140 ELF.Symbol s = symbols[i];
141 if(s.type == ELF.Symbol.STT_FUNC && s.binding == ELF.Symbol.STB_GLOBAL && (s.name.equals("_call_helper") || !s.name.startsWith("_"))) {
143 clinit.add(LDC,s.name);
144 clinit.add(NEW,Type.INTEGER_OBJECT);
146 clinit.add(LDC,s.addr);
147 clinit.add(INVOKESPECIAL,new MethodRef(Type.INTEGER_OBJECT,"<init>",Type.VOID,new Type[]{Type.INT}));
148 clinit.add(INVOKEVIRTUAL,new MethodRef(hash,"put",Type.OBJECT,new Type[]{Type.OBJECT,Type.OBJECT}));
157 ELF.SHeader text = elf.sectionWithName(".text");
160 MethodGen tramp = cg.addMethod("trampoline",Type.VOID,Type.NO_ARGS,ACC_PRIVATE);
162 int start = tramp.size();
164 tramp.add(GETFIELD,new FieldRef(me,"state",Type.INT));
165 tramp.add(IFEQ,tramp.size()+2);
170 tramp.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
171 tramp.add(LDC,methodShift);
174 int beg = text.addr >>> methodShift;
175 int end = ((text.addr + text.size + maxBytesPerMethod - 1) >>> methodShift);
177 MethodGen.TSI tsi = new MethodGen.TSI(beg,end-1);
178 tramp.add(TABLESWITCH,tsi);
179 for(int n=beg;n<end;n++) {
180 tsi.setTargetForVal(n,tramp.size());
181 tramp.add(INVOKESPECIAL,new MethodRef(me,"run_"+toHex(n<<methodShift),Type.VOID,Type.NO_ARGS));
182 tramp.add(GOTO,start);
184 tsi.setDefaultTarget(tramp.size());
187 tramp.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
189 tramp.add(NEW, Type.STRINGBUFFER);
191 tramp.add(LDC,"Jumped to invalid address in trampoline (r2: ");
192 tramp.add(INVOKESPECIAL,new MethodRef(Type.STRINGBUFFER,"<init>",Type.VOID,new Type[]{Type.STRING}));
194 tramp.add(GETFIELD, new FieldRef(me,"r2",Type.INT));
195 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
196 tramp.add(LDC," pc: ");
197 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.STRING}));
199 tramp.add(GETFIELD, new FieldRef(me,"pc",Type.INT));
200 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
202 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.STRING}));
203 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"toString",Type.STRING,Type.NO_ARGS));
204 tramp.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
209 } catch(ClassGen.Exn e) {
210 e.printStackTrace(warn);
211 throw new Exn("Generation of the trampoline method failed. Try increasing maxInsnPerMethod");
214 addConstReturnMethod("gp",gp.addr);
215 addConstReturnMethod("entryPoint",elf.header.entry);
216 addConstReturnMethod("heapStart",highestAddr);
218 if(userInfo != null) {
219 addConstReturnMethod("userInfoBase",userInfo.addr);
220 addConstReturnMethod("userInfoSize",userInfo.size);
224 Type.Object hashClassType = new Type.Object(hashClass);
225 MethodGen ls = cg.addMethod("lookupSymbol",Type.INT,new Type[]{Type.STRING},ACC_PROTECTED);
226 ls.add(GETSTATIC,new FieldRef(me,"symbols",hashClassType));
228 ls.add(INVOKEVIRTUAL,new MethodRef(hashClassType,"get",Type.OBJECT,new Type[]{Type.OBJECT}));
230 int b = ls.add(IFNULL);
231 ls.add(CHECKCAST,Type.INTEGER_OBJECT);
232 ls.add(INVOKEVIRTUAL,new MethodRef(Type.INTEGER_OBJECT,"intValue",Type.INT,Type.NO_ARGS));
234 ls.setArg(b,ls.size());
240 Type.Object cpuStateType = new Type.Object("org.ibex.nestedvm.Runtime$CPUState");
241 MethodGen setCPUState = cg.addMethod("setCPUState",Type.VOID,new Type[]{cpuStateType},ACC_PROTECTED);
242 MethodGen getCPUState = cg.addMethod("getCPUState",Type.VOID,new Type[]{cpuStateType},ACC_PROTECTED);
244 setCPUState.add(ALOAD_1);
245 getCPUState.add(ALOAD_1);
246 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,"r",Type.arrayType(Type.INT)));
247 getCPUState.add(GETFIELD,new FieldRef(cpuStateType,"r",Type.arrayType(Type.INT)));
248 setCPUState.add(ASTORE_2);
249 getCPUState.add(ASTORE_2);
251 for(int i=1;i<32;i++) {
252 setCPUState.add(ALOAD_0);
253 setCPUState.add(ALOAD_2);
254 setCPUState.add(LDC,i);
255 setCPUState.add(IALOAD);
256 setCPUState.add(PUTFIELD,new FieldRef(me,"r"+i,Type.INT));
258 getCPUState.add(ALOAD_2);
259 getCPUState.add(LDC,i);
260 getCPUState.add(ALOAD_0);
261 getCPUState.add(GETFIELD,new FieldRef(me,"r"+i,Type.INT));
262 getCPUState.add(IASTORE);
265 setCPUState.add(ALOAD_1);
266 getCPUState.add(ALOAD_1);
267 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,"f",Type.arrayType(Type.INT)));
268 getCPUState.add(GETFIELD,new FieldRef(cpuStateType,"f",Type.arrayType(Type.INT)));
269 setCPUState.add(ASTORE_2);
270 getCPUState.add(ASTORE_2);
272 for(int i=0;i<32;i++) {
273 setCPUState.add(ALOAD_0);
274 setCPUState.add(ALOAD_2);
275 setCPUState.add(LDC,i);
276 setCPUState.add(IALOAD);
277 if(singleFloat) setCPUState.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"intBitsToFloat",Type.FLOAT,new Type[]{Type.INT}));
278 setCPUState.add(PUTFIELD,new FieldRef(me,"f"+i,singleFloat ? Type.FLOAT : Type.INT));
280 getCPUState.add(ALOAD_2);
281 getCPUState.add(LDC,i);
282 getCPUState.add(ALOAD_0);
283 getCPUState.add(GETFIELD,new FieldRef(me,"f"+i,singleFloat ? Type.FLOAT: Type.INT));
284 if(singleFloat) getCPUState.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"floatToIntBits",Type.INT,new Type[]{Type.FLOAT}));
285 getCPUState.add(IASTORE);
288 String[] each = new String[] { "hi","lo","fcsr","pc" };
289 for(int i=0;i<each.length;i++) {
290 setCPUState.add(ALOAD_0);
291 setCPUState.add(ALOAD_1);
292 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,each[i],Type.INT));
293 setCPUState.add(PUTFIELD,new FieldRef(me,each[i],Type.INT));
295 getCPUState.add(ALOAD_1);
296 getCPUState.add(ALOAD_0);
297 getCPUState.add(GETFIELD,new FieldRef(me,each[i],Type.INT));
298 getCPUState.add(PUTFIELD,new FieldRef(cpuStateType,each[i],Type.INT));
300 setCPUState.add(RETURN);
301 getCPUState.add(RETURN);
304 MethodGen execute = cg.addMethod("_execute",Type.VOID,Type.NO_ARGS,ACC_PROTECTED);
305 int tryStart = execute.size();
306 execute.add(ALOAD_0);
307 execute.add(INVOKESPECIAL,new MethodRef(me,"trampoline",Type.VOID,Type.NO_ARGS));
308 int tryEnd = execute.size();
311 int catchInsn = execute.size();
312 execute.add(ASTORE_1);
313 execute.add(NEW, new Type.Object("org.ibex.nestedvm.Runtime$FaultException"));
315 execute.add(ALOAD_1);
316 execute.add(INVOKESPECIAL,new MethodRef("org.ibex.nestedvm.Runtime$FaultException","<init>",Type.VOID,new Type[]{new Type.Object("java.lang.RuntimeException")}));
319 execute.addExceptionHandler(tryStart,tryEnd,catchInsn,new Type.Object("java.lang.RuntimeException"));
320 execute.addThrow(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
322 MethodGen main = cg.addMethod("main",Type.VOID,new Type[]{Type.arrayType(Type.STRING)},ACC_STATIC|ACC_PUBLIC);
325 main.add(INVOKESPECIAL,new MethodRef(me,"<init>",Type.VOID,Type.NO_ARGS));
326 main.add(LDC,fullClassName);
329 Type.Object ur = new Type.Object("org.ibex.nestedvm.UnixRuntime");
330 main.add(INVOKESTATIC,new MethodRef(ur,"runAndExec",Type.INT,new Type[]{ur,Type.STRING,Type.arrayType(Type.STRING)}));
332 main.add(INVOKEVIRTUAL,new MethodRef(me,"run",Type.INT,new Type[]{Type.STRING,Type.arrayType(Type.STRING)}));
334 main.add(INVOKESTATIC,new MethodRef(new Type.Object("java.lang.System"),"exit",Type.VOID,new Type[]{Type.INT}));
340 private void addConstReturnMethod(String name, int val) {
341 MethodGen m = cg.addMethod(name,Type.INT,Type.NO_ARGS,ACC_PROTECTED);
346 private static int initDataCount;
347 private void emitData(int addr, DataInputStream dis, int size, boolean readOnly) throws Exn,IOException {
348 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Data section on weird boundaries");
349 int last = addr + size;
351 int segSize = Math.min(size,28000); // must be a multiple of 56
352 StringBuffer sb = new StringBuffer();
353 for(int i=0;i<segSize;i+=7) {
355 for(int j=0;j<7;j++) {
357 byte b = (i+j < size) ? dis.readByte() : 1;
361 sb.append((char) ((l>>>(7*(7-j)))&0x7f));
363 String fieldname = "_data" + (++initDataCount);
364 cg.addField(fieldname,Type.arrayType(Type.INT),ACC_PRIVATE|ACC_STATIC|ACC_FINAL);
366 clinit.add(LDC,sb.toString());
367 clinit.add(LDC,segSize/4);
368 clinit.add(INVOKESTATIC,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime"),"decodeData",Type.arrayType(Type.INT),new Type[]{Type.STRING,Type.INT}));
369 clinit.add(PUTSTATIC,new FieldRef(me,fieldname,Type.arrayType(Type.INT)));
372 init.add(GETSTATIC,new FieldRef(me,fieldname,Type.arrayType(Type.INT)));
374 init.add(LDC,readOnly ? 1 : 0);
375 init.add(INVOKEVIRTUAL,new MethodRef(me,"initPages",Type.VOID,new Type[]{Type.arrayType(Type.INT),Type.INT,Type.BOOLEAN}));
383 private void emitBSS(int addr, int size) throws Exn {
384 if((addr&3)!=0) throw new Exn("BSS section on weird boundaries");
391 init.add(INVOKEVIRTUAL,new MethodRef(me,"clearPages",Type.VOID,new Type[]{Type.INT,Type.INT}));
395 private boolean textDone; // a text segment was already processed
396 private int startOfMethod = 0; // the start of this method (not necessarily the first instruction)
397 private int endOfMethod = 0; // the maximum end of this method (could end before it is full)
398 private boolean unreachable = false; // is the current pc is reachable
400 private MethodGen.PhantomTarget returnTarget; // where to jump when exiting the method
401 private MethodGen.PhantomTarget defaultTarget; // the default switch target (throws exn)
402 private MethodGen.PhantomTarget[] insnTargets; // the targets for each jumpable instruction
403 private MethodGen mg; // the method itself
405 private boolean jumpable(int addr) { return jumpableAddresses.get(new Integer(addr)) != null; }
407 private void emitText(int addr, DataInputStream dis, int size) throws Exn,IOException {
408 if(textDone) throw new Exn("Multiple text segments");
411 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Section on weird boundaries");
413 int insn,nextInsn=-1;
414 boolean skipNext = true;
416 for(int i=0;i<count;i++,addr+=4) {
417 insn = skipNext ? dis.readInt() : nextInsn;
418 nextInsn = (i == count-1) ? -1 : dis.readInt();
419 if(addr >= endOfMethod) { endMethod(addr); startMethod(addr); }
420 if(insnTargets[(addr-startOfMethod)/4] != null) {
421 insnTargets[(addr-startOfMethod)/4].setTarget(mg.size());
423 } else if(unreachable) {
427 int o = preSetRegStackPos;
428 skipNext = emitInstruction(addr,insn,nextInsn);
429 if(o != preSetRegStackPos) throw new Exn("here");
431 e.printStackTrace(warn);
432 warn.println("Exception at " + toHex(addr));
434 } catch(RuntimeException e) {
435 warn.println("Exception at " + toHex(addr));
438 if(skipNext) { addr+=4; i++; }
445 private void startMethod(int first) {
446 startOfMethod = first & methodMask;
447 endOfMethod = startOfMethod + maxBytesPerMethod;
449 mg = cg.addMethod("run_" + toHex(startOfMethod),Type.VOID,Type.NO_ARGS,ACC_PRIVATE|ACC_FINAL);
452 mg.add(GETFIELD,new FieldRef(me,"page",Type.arrayType(Type.INT)));
456 mg.add(GETFIELD,new FieldRef(me,"readPages",Type.arrayType(Type.INT,2)));
459 mg.add(GETFIELD,new FieldRef(me,"writePages",Type.arrayType(Type.INT,2)));
463 returnTarget = new MethodGen.PhantomTarget();
464 insnTargets = new MethodGen.PhantomTarget[maxBytesPerMethod/4];
466 int[] buf = new int[maxBytesPerMethod/4];
467 Object[] targetBuf = new Object[maxBytesPerMethod/4];
469 for(int addr=first;addr<endOfMethod;addr+=4) {
471 targetBuf[n] = insnTargets[(addr-startOfMethod)/4] = new MethodGen.PhantomTarget();
477 MethodGen.LSI lsi = new MethodGen.LSI(n);
478 System.arraycopy(buf,0,lsi.vals,0,n);
479 System.arraycopy(targetBuf,0,lsi.targets,0,n);
480 lsi.setDefaultTarget(defaultTarget = new MethodGen.PhantomTarget());
485 mg.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
486 mg.add(LOOKUPSWITCH,lsi);
489 private void endMethod(int firstAddrOfNext) {
490 if(startOfMethod == 0) return;
494 mg.add(LDC,firstAddrOfNext);
496 // mark the start of the next method as jumpable
497 jumpableAddresses.put(new Integer(firstAddrOfNext),Boolean.TRUE);
500 returnTarget.setTarget(mg.size());
506 defaultTarget.setTarget(mg.size());
509 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
511 mg.add(NEW,Type.STRINGBUFFER);
513 mg.add(LDC,"Jumped to invalid address: ");
514 mg.add(INVOKESPECIAL,new MethodRef(Type.STRINGBUFFER,"<init>",Type.VOID,new Type[]{Type.STRING}));
516 mg.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
517 mg.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
518 mg.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"toString",Type.STRING,Type.NO_ARGS));
519 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
522 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
524 mg.add(LDC,"Jumped to invalid address");
525 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
529 endOfMethod = startOfMethod = 0;
533 private void leaveMethod() {
534 mg.add(GOTO,returnTarget);
537 private void link(int mypc) {
540 int ref = (mypc+8 + 32768) & ~65535;
541 int diff = (mypc+8) - ref;
542 if(diff < -32768 || diff > 32767) throw new Error("should never happen " + diff);
552 private void branch(int pc, int target) {
553 if((pc&methodMask) == (target&methodMask)) {
554 mg.add(GOTO,insnTargets[(target-startOfMethod)/4]);
563 // This assumes everything needed by ifInsn is already on the stack
564 private boolean doIfInstruction(byte op, int pc, int target, int nextInsn) throws Exn {
565 emitInstruction(-1,nextInsn,-1); // delay slot
566 if((target&methodMask) == (pc&methodMask)) {
567 mg.add(op,insnTargets[(target-startOfMethod)/4]);
569 int h = mg.add(MethodGen.negate(op));
571 mg.setArg(h,mg.size());
573 if(!jumpable(pc+4)) return true; // done - skip it
575 //System.err.println("Delay slot is jumpable - This code is untested + " + toHex(nextInsn));
576 if(pc+4==endOfMethod) {
577 // the delay slot is at the start of the next method
578 jumpableAddresses.put(new Integer(pc+8),Boolean.TRUE); // make the 2nd insn of the next method jumpable
579 branch(pc,pc+8); // jump over it
580 //System.err.println("delay slot: " + toHex(pc+8)); */
582 return false; // we still need to output it
584 //System.err.println("jumped over delay slot: " + toHex(pc+4));
585 // add another copy and jump over
587 int b = mg.add(GOTO);
588 insnTargets[(pc+4-startOfMethod)/4].setTarget(mg.size());
589 emitInstruction(-1,nextInsn,01); // delay slot
590 mg.setArg(b,mg.size());
596 private static final Float POINT_5_F = new Float(0.5f);
597 private static final Double POINT_5_D = new Double(0.5f);
598 private static final Long FFFFFFFF = new Long(0xffffffffL);
600 private boolean emitInstruction(int pc, int insn, int nextInsn) throws Exn {
601 MethodGen mg = this.mg; // smaller bytecode
602 if(insn == -1) throw new Exn("insn is -1");
604 int op = (insn >>> 26) & 0xff; // bits 26-31
605 int rs = (insn >>> 21) & 0x1f; // bits 21-25
606 int rt = (insn >>> 16) & 0x1f; // bits 16-20
607 int ft = (insn >>> 16) & 0x1f;
608 int rd = (insn >>> 11) & 0x1f; // bits 11-15
609 int fs = (insn >>> 11) & 0x1f;
610 int shamt = (insn >>> 6) & 0x1f; // bits 6-10
611 int fd = (insn >>> 6) & 0x1f;
612 int subcode = insn & 0x3f; // bits 0-5
613 int breakCode = (insn >>> 6) & 0xfffff; // bits 6-20
615 int jumpTarget = (insn & 0x03ffffff); // bits 0-25
616 int unsignedImmediate = insn & 0xffff;
617 int signedImmediate = (insn << 16) >> 16;
618 int branchTarget = signedImmediate;
670 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
671 emitInstruction(-1,nextInsn,-1);
679 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
680 emitInstruction(-1,nextInsn,-1);
693 // FEATURE: This is actually broken, but it happens to work for our code
694 // a func could theoretically jump back to here from a future point
695 restoreChangedRegs();
706 mg.add(INVOKEVIRTUAL,new MethodRef(me,"syscall",Type.INT,new Type[]{Type.INT,Type.INT,Type.INT,Type.INT,Type.INT,Type.INT,Type.INT}));
710 mg.add(GETFIELD,new FieldRef(me,"state",Type.INT));
716 mg.setArg(b1,mg.size());
719 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
721 mg.add(LDC,"BREAK Code " + toHex(breakCode));
722 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
756 mg.add(SWAP); //a(InstructionConstants.SWAP);
763 mg.add(SWAP); //a(InstructionConstants.SWAP);
770 mg.add(LDC,FFFFFFFF);
774 mg.add(LDC,FFFFFFFF);
816 mg.add(LDC,FFFFFFFF);
821 mg.add(LDC,FFFFFFFF);
838 mg.setArg(b1,mg.size());
843 throw new Exn("ADD (add with oveflow trap) not suported");
846 if(rt != 0 && rs != 0) {
858 throw new Exn("SUB (add with oveflow trap) not suported");
861 if(rt != 0 && rs != 0) {
896 if(rs != 0 || rt != 0) {
897 if(rs != 0 && rt != 0) {
918 b1 = mg.add(IF_ICMPLT);
921 mg.setArg(b1,mg.add(ICONST_1));
922 mg.setArg(b2,mg.size());
934 mg.add(LDC,FFFFFFFF);
938 mg.add(LDC,FFFFFFFF);
948 mg.setArg(b1,mg.add(ICONST_1));
949 mg.setArg(b2,mg.size());
956 throw new Exn("Illegal instruction 0/" + subcode);
963 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
965 return doIfInstruction(IFLT,pc,pc+branchTarget*4+4,nextInsn);
967 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
969 return doIfInstruction(IFGE,pc,pc+branchTarget*4+4,nextInsn);
971 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
974 emitInstruction(-1,nextInsn,-1);
976 branch(pc,pc+branchTarget*4+4);
977 mg.setArg(b1,mg.size());
980 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
982 if(rs != 0) { // r0 is always >= 0
986 emitInstruction(-1,nextInsn,-1);
988 branch(pc,pc+branchTarget*4+4);
989 if(b1 != -1) mg.setArg(b1,mg.size());
990 if(b1 == -1) unreachable = true;
993 throw new Exn("Illegal Instruction 1/" + rt);
998 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
999 emitInstruction(-1,nextInsn,-1);
1000 branch(pc,(pc&0xf0000000)|(jumpTarget << 2));
1005 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1006 int target = (pc&0xf0000000)|(jumpTarget << 2);
1007 emitInstruction(-1,nextInsn,-1);
1014 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1016 emitInstruction(-1,nextInsn,-1);
1017 branch(pc,pc+branchTarget*4+4);
1019 } else if(rs == 0 || rt == 0) {
1020 pushReg(rt == 0 ? R+rs : R+rt);
1021 return doIfInstruction(IFEQ,pc,pc+branchTarget*4+4,nextInsn);
1025 return doIfInstruction(IF_ICMPEQ,pc,pc+branchTarget*4+4,nextInsn);
1029 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1032 return doIfInstruction(IFNE,pc,pc+branchTarget*4+4,nextInsn);
1035 return doIfInstruction(IF_ICMPNE,pc,pc+branchTarget*4+4,nextInsn);
1038 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1040 return doIfInstruction(IFLE,pc,pc+branchTarget*4+4,nextInsn);
1042 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1044 return doIfInstruction(IFGT,pc,pc+branchTarget*4+4,nextInsn);
1046 throw new Exn("ADDI (add immediate with oveflow trap) not suported");
1048 if(rs != 0 && signedImmediate != 0 && rs == rt && doLocal(rt) && signedImmediate >= -32768 && signedImmediate <= 32767) {
1049 // HACK: This should be a little cleaner
1050 regLocalReadCount[rt]++;
1051 regLocalWriteCount[rt]++;
1052 mg.add(IINC, new MethodGen.Pair(getLocalForReg(rt),signedImmediate));
1055 addiu(rs,signedImmediate);
1062 mg.add(LDC,signedImmediate);
1063 b1 = mg.add(IF_ICMPLT);
1066 mg.setArg(b1,mg.add(ICONST_1));
1067 mg.setArg(b2,mg.size());
1074 mg.add(LDC,FFFFFFFF);
1076 // Yes, this is correct, you have to sign extend the immediate then do an UNSIGNED comparison
1077 mg.add(LDC,new Long(signedImmediate&0xffffffffL));
1083 mg.setArg(b1,mg.add(ICONST_1));
1084 mg.setArg(b2,mg.size());
1090 mg.add(LDC,unsignedImmediate);
1096 if(rs != 0 && unsignedImmediate != 0) {
1098 mg.add(LDC,unsignedImmediate);
1103 mg.add(LDC,unsignedImmediate);
1110 mg.add(LDC,unsignedImmediate);
1116 mg.add(LDC,unsignedImmediate << 16);
1120 throw new Exn("TLB/Exception support not implemented");
1129 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
1136 if(rt != 0) pushReg(R+rt);
1137 else mg.add(ICONST_0);
1141 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
1146 case 8: {// BC1F, BC1T
1148 mg.add(LDC,0x800000);
1150 return doIfInstruction(((insn>>>16)&1) == 0 ? IFEQ : IFNE,pc,pc+branchTarget*4+4,nextInsn);
1154 { // Single/Double math
1155 boolean d = rs == 17;
1158 preSetDouble(F+fd,d);
1161 mg.add(d ? DADD : FADD);
1165 preSetDouble(F+fd,d);
1168 mg.add(d ? DSUB : FSUB);
1172 preSetDouble(F+fd,d);
1175 mg.add(d ? DMUL : FMUL);
1179 preSetDouble(F+fd,d);
1182 mg.add(d ? DDIV : FDIV);
1186 preSetDouble(F+fd,d);
1187 // NOTE: We can't use fneg/dneg here since they'll turn +0.0 into -0.0
1190 mg.add(d ? DUP2 : DUP);
1191 mg.add(d ? DCONST_0 : FCONST_0);
1192 mg.add(d ? DCMPG : FCMPG);
1195 mg.add(d ? DCONST_0 : FCONST_0);
1202 mg.add(d ? DSUB : FSUB);
1204 mg.setArg(b1,mg.size());
1220 preSetDouble(F+fd,d);
1222 mg.add(d ? DNEG : FNEG);
1237 case 36: { // CVT.W.D
1238 MethodGen.TSI tsi = new MethodGen.TSI(0,3);
1244 mg.add(TABLESWITCH,tsi);
1246 // Round towards plus infinity
1247 tsi.setTarget(2,mg.size());
1248 if(!d) mg.add(F2D); // Ugh.. java.lang.Math doesn't have a float ceil/floor
1249 mg.add(INVOKESTATIC,new MethodRef("java.lang.Math","ceil",Type.DOUBLE,new Type[]{Type.DOUBLE}));
1254 tsi.setTarget(0,mg.size());
1255 mg.add(LDC,d ? (Object)POINT_5_D : (Object)POINT_5_F);
1256 mg.add(d ? DADD : FADD);
1259 // Round towards minus infinity
1260 tsi.setTarget(3,mg.size());
1262 mg.add(INVOKESTATIC,new MethodRef("java.lang.Math","floor",Type.DOUBLE,new Type[]{Type.DOUBLE}));
1265 tsi.setTarget(1,mg.size());
1266 tsi.setDefaultTarget(mg.size());
1267 mg.setArg(b1,mg.size());
1269 mg.add(d ? D2I : F2I);
1279 mg.add(LDC,~0x800000);
1283 mg.add(d ? DCMPG : FCMPG);
1285 case 50: b1 = mg.add(IFNE); break;
1286 case 60: b1 = mg.add(IFGE); break;
1287 case 62: b1 = mg.add(IFGT); break;
1290 mg.add(LDC,0x800000);
1292 mg.setArg(b1,mg.size());
1295 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
1299 case 20: { // Integer
1313 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
1318 throw new Exn("Invalid Instruction 17/" + rs);
1323 throw new Exn("coprocessor 2 and 3 instructions not available");
1326 addiu(R+rs,signedImmediate);
1346 addiu(R+rs,signedImmediate);
1366 addiu(R+rs,signedImmediate);
1370 mg.add(LDC,0x00ffffff);
1401 memRead(R+rs,signedImmediate);
1406 addiu(R+rs,signedImmediate);
1427 addiu(R+rs,signedImmediate);
1442 // chars are unsigend so this works
1449 addiu(R+rs,signedImmediate);
1453 mg.add(LDC,0xffffff00);
1482 addiu(R+rs,signedImmediate);
1489 mg.add(LDC,0xff000000);
1524 addiu(R+rs,signedImmediate);
1564 addiu(R+rs,signedImmediate);
1571 mg.add(LDC,0xffffff00);
1599 preMemWrite2(R+rs,signedImmediate);
1604 addiu(R+rs,signedImmediate);
1611 mg.add(LDC,0x00ffffff);
1636 // This need to be atomic if we ever support threads (see SWC0/SC)
1639 memRead(R+rs,signedImmediate);
1645 memRead(R+rs,signedImmediate);
1649 /* This needs to fail (set rt to 0) if the memory location was modified
1650 * between the LL and SC if we ever support threads.
1655 preMemWrite2(R+rs,signedImmediate);
1664 preMemWrite2(R+rs,signedImmediate);
1669 throw new Exn("Invalid Instruction: " + op + " at " + toHex(pc));
1674 // Helper functions for emitText
1676 private static final int R = 0;
1677 private static final int F = 32;
1678 private static final int HI = 64;
1679 private static final int LO = 65;
1680 private static final int FCSR = 66;
1681 private static final int REG_COUNT=67;
1683 private int[] regLocalMapping = new int[REG_COUNT];
1684 private int[] regLocalReadCount = new int[REG_COUNT];
1685 private int[] regLocalWriteCount = new int[REG_COUNT];
1686 private int nextAvailLocal;
1687 private int loadsStart;
1688 private static final int MAX_LOCALS = 4;
1689 private static final int LOAD_LENGTH = 3;
1691 private boolean doLocal(int reg) {
1692 return reg == R+2 || reg == R+3 || reg == R+4 || reg == R+29;
1695 private int getLocalForReg(int reg) {
1696 if(regLocalMapping[reg] != 0) return regLocalMapping[reg];
1697 if(nextAvailLocal == 0) nextAvailLocal = onePage ? 4 : 5;
1698 regLocalMapping[reg] = nextAvailLocal++;
1699 return regLocalMapping[reg];
1702 private void fixupRegsStart() {
1703 for(int i=0;i<REG_COUNT;i++)
1704 regLocalMapping[i] = regLocalReadCount[i] = regLocalWriteCount[i] = 0;
1706 loadsStart = mg.size();
1707 for(int i=0;i<MAX_LOCALS*LOAD_LENGTH;i++)
1711 private void fixupRegsEnd() {
1713 for(int i=0;i<REG_COUNT;i++) {
1714 if(regLocalMapping[i] == 0) continue;
1715 mg.set(p++,ALOAD_0);
1716 mg.set(p++,GETFIELD,new FieldRef(me,regField[i],Type.INT));
1717 mg.set(p++,ISTORE,regLocalMapping[i]);
1719 if(regLocalWriteCount[i] > 0) {
1721 mg.add(ILOAD,regLocalMapping[i]);
1722 mg.add(PUTFIELD,new FieldRef(me,regField[i],Type.INT));
1727 private void restoreChangedRegs() {
1728 for(int i=0;i<REG_COUNT;i++) {
1729 if(regLocalWriteCount[i] > 0) {
1731 mg.add(ILOAD,regLocalMapping[i]);
1732 mg.add(PUTFIELD,new FieldRef(me,regField[i],Type.INT));
1737 private static final String[] regField = {
1738 "r0","r1","r2","r3","r4","r5","r6","r7",
1739 "r8","r9","r10","r11","r12","r13","r14","r15",
1740 "r16","r17","r18","r19","r20","r21","r22","r23",
1741 "r24","r25","r26","r27","r28","r29","r30","r31",
1743 "f0","f1","f2","f3","f4","f5","f6","f7",
1744 "f8","f9","f10","f11","f12","f13","f14","f15",
1745 "f16","f17","f18","f19","f20","f21","f22","f23",
1746 "f24","f25","f26","f27","f28","f29","f30","f31",
1751 private int pushRegWZ(int reg) {
1753 warn.println("Warning: Pushing r0!");
1754 new Exception().printStackTrace(warn);
1756 return pushRegZ(reg);
1759 private int pushRegZ(int reg) {
1760 if(reg == R+0) return mg.add(ICONST_0);
1761 else return pushReg(reg);
1765 private int pushReg(int reg) {
1768 regLocalReadCount[reg]++;
1769 mg.add(ILOAD,getLocalForReg(reg));
1770 } else if(reg >= F+0 && reg <= F+31 && singleFloat) {
1772 mg.add(GETFIELD,new FieldRef(me,regField[reg],Type.FLOAT));
1773 mg.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"floatToIntBits",Type.INT,new Type[]{Type.FLOAT}));
1776 mg.add(GETFIELD,new FieldRef(me,regField[reg],Type.INT));
1781 private int preSetRegStackPos;
1782 private int[] preSetRegStack = new int[8];
1784 // This can push ONE or ZERO words to the stack. If it pushed one it returns true
1785 private boolean preSetReg(int reg) {
1786 preSetRegStack[preSetRegStackPos] = reg;
1787 preSetRegStackPos++;
1796 private int setReg() {
1797 if(preSetRegStackPos==0) throw new RuntimeException("didn't do preSetReg");
1798 preSetRegStackPos--;
1799 int reg = preSetRegStack[preSetRegStackPos];
1802 mg.add(ISTORE,getLocalForReg(reg));
1803 regLocalWriteCount[reg]++;
1804 } else if(reg >= F+0 && reg <= F+31 && singleFloat) {
1805 mg.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"intBitsToFloat",Type.FLOAT,new Type[]{Type.INT}));
1806 mg.add(PUTFIELD,new FieldRef(me,regField[reg],Type.FLOAT));
1808 mg.add(PUTFIELD,new FieldRef(me,regField[reg],Type.INT));
1813 private int preSetPC() { return mg.add(ALOAD_0); }
1814 private int setPC() {
1815 return mg.add(PUTFIELD,new FieldRef(me,"pc",Type.INT));
1818 //unused - private InstructionHandle pushDouble(int reg) throws CompilationException { return pushDouble(reg,true); }
1819 private int pushFloat(int reg) throws Exn { return pushDouble(reg,false); }
1820 private int pushDouble(int reg, boolean d) throws Exn {
1821 if(reg < F || reg >= F+32) throw new IllegalArgumentException(""+reg);
1824 if(singleFloat) throw new Exn("Double operations not supported when singleFloat is enabled");
1825 if(reg == F+31) throw new Exn("Tried to use a double in f31");
1832 mg.add(LDC,FFFFFFFF);
1835 mg.add(INVOKESTATIC,new MethodRef(Type.DOUBLE_OBJECT,"longBitsToDouble",Type.DOUBLE,new Type[]{Type.LONG}));
1836 } else if(singleFloat) {
1838 mg.add(GETFIELD,new FieldRef(me,regField[reg],Type.FLOAT));
1841 mg.add(INVOKESTATIC,new MethodRef("java.lang.Float","intBitsToFloat",Type.FLOAT,new Type[]{Type.INT}));
1846 private void preSetFloat(int reg) { preSetDouble(reg,false); }
1847 private void preSetDouble(int reg) { preSetDouble(reg,true); }
1848 private void preSetDouble(int reg, boolean d) { preSetReg(reg); }
1850 private int setFloat() throws Exn { return setDouble(false); }
1851 private int setDouble() throws Exn { return setDouble(true); }
1852 private int setDouble(boolean d) throws Exn {
1853 int reg = preSetRegStack[preSetRegStackPos-1];
1854 if(reg < F || reg >= F+32) throw new IllegalArgumentException(""+reg);
1857 if(singleFloat) throw new Exn("Double operations not supported when singleFloat is enabled");
1858 if(reg == F+31) throw new Exn("Tried to use a double in f31");
1859 mg.add(INVOKESTATIC,new MethodRef(Type.DOUBLE_OBJECT,"doubleToLongBits",Type.LONG,new Type[]{Type.DOUBLE}));
1864 if(preSetReg(reg+1))
1868 setReg(); // preSetReg was already done for this by preSetDouble
1869 } else if(singleFloat) {
1870 // HACK: Clean this up
1871 preSetRegStackPos--;
1872 mg.add(PUTFIELD,new FieldRef(me,regField[reg],Type.FLOAT));
1874 //h = a(fac.createInvoke("java.lang.Float","floatToRawIntBits",Type.INT,new Type[]{Type.FLOAT},INVOKESTATIC));
1875 mg.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"floatToRawIntBits",Type.INT,new Type[]{Type.FLOAT}));
1881 private final int tmpVar = 1;
1882 private void pushTmp() { mg.add(ILOAD_1); }
1883 private void setTmp() { mg.add(ISTORE_1); }
1885 private void addiu(int reg, int offset) {
1886 if(reg != R+0 && offset != 0) {
1890 } else if(reg != R+0) {
1896 private int memWriteStage;
1897 private void preMemWrite1() {
1898 if(memWriteStage!=0) throw new Error("pending preMemWrite1/2");
1908 private void preMemWrite2(int reg, int offset) {
1913 private void preMemWrite2() { preMemWrite2(false); }
1914 private void preMemWrite2(boolean addrInTmp) {
1915 if(memWriteStage!=1) throw new Error("pending preMemWrite2 or no preMemWrite1");
1918 if(nullPointerCheck) {
1922 mg.add(INVOKEVIRTUAL,new MethodRef(me,"nullPointerCheck",Type.VOID,new Type[]{Type.INT}));
1928 } else if(fastMem) {
1931 mg.add(LDC,pageShift);
1940 mg.add(LDC,(pageSize>>2)-1);
1945 // pops an address and value off the stack, sets *addr to value
1946 private void memWrite() {
1947 if(memWriteStage!=2) throw new Error("didn't do preMemWrite1 or preMemWrite2");
1952 } else if(fastMem) {
1955 mg.add(INVOKEVIRTUAL,new MethodRef(me,"unsafeMemWrite",Type.VOID,new Type[]{Type.INT,Type.INT}));
1960 // reads the word at r[reg]+offset
1961 private void memRead(int reg, int offset) {
1967 private boolean didPreMemRead;
1968 private boolean preMemReadDoPreWrite;
1970 private void preMemRead() { preMemRead(false); }
1971 private void preMemRead(boolean preWrite) {
1972 if(didPreMemRead) throw new Error("pending preMemRead");
1973 didPreMemRead = true;
1974 preMemReadDoPreWrite = preWrite;
1978 mg.add(ALOAD,preWrite ? 3 : 2);
1982 // memRead pops an address off the stack, reads the value at that addr, and pushed the value
1983 // preMemRead MUST be called BEFORE the addresses is pushed
1984 private void memRead() { memRead(false); }
1986 private void memRead(boolean addrInTmp) {
1987 if(!didPreMemRead) throw new Error("didn't do preMemRead");
1988 didPreMemRead = false;
1989 if(preMemReadDoPreWrite)
1992 if(nullPointerCheck) {
1996 mg.add(INVOKEVIRTUAL,new MethodRef(me,"nullPointerCheck",Type.VOID,new Type[]{Type.INT}));
2002 if(preMemReadDoPreWrite)
2005 } else if(fastMem) {
2008 mg.add(LDC,pageShift);
2017 mg.add(LDC,(pageSize>>2)-1);
2019 if(preMemReadDoPreWrite)
2024 if(preMemReadDoPreWrite)
2026 mg.add(INVOKEVIRTUAL,new MethodRef(me,"unsafeMemRead",Type.INT,new Type[]{Type.INT}));
2031 // This might come in handy for something else
2032 /*private boolean touchesReg(int insn, int reg) {
2033 if((reg < R+0 || reg >= R+32) && reg != FCSR) throw new IllegalArgumentException(""+reg);
2034 if(reg == R+0) return false; // r0 is never modified
2035 int op = (insn >>> 26) & 0xff; // bits 26-31
2036 int subcode = insn & 0x3f; // bits 0-5
2037 int rd = (insn >>> 11) & 0x1f; // bits 11-15
2038 int rt = (insn >>> 16) & 0x1f; // bits 16-20
2039 int rs = (insn >>> 21) & 0x1f; // bits 21-25
2043 if(subcode >= 0 && subcode <= 7) return reg == R+rd; // Shift ops
2044 if(subcode >= 32 && subcode <= 43) return reg == R+rd; // Other math ops
2045 if(subcode >= 24 && subcode <= 27) return reg == HI || reg == LO; // MULT/DIV
2047 case 13: return false; // BREAK
2050 case 0: return reg == R+rt; // MFC.1
2051 case 2: return reg == R+rt; // CFC.1
2052 case 4: return false; // MTC.1
2053 case 6: return false; // CTC.1
2056 if(subcode == 50 || subcode == 60 || subcode == 62) return reg == FCSR;
2057 return false; // everything else just touches f0-f31
2058 case 20: return false; // Integer - just touches f0-f31
2062 if(op >= 8 && op <= 15) return reg == R+rt; // XXXI instructions
2063 if(op >= 40 && op <= 46) return false; // Memory WRITE ops
2064 if(op == 49) return reg == F+rt; // LWC1
2065 if(op == 57) return false; // SWC1
2068 warn.println("Unknown instruction in touchesReg()- assuming it modifies all regs " + op + " " + subcode);
2069 new Exception().fillInStackTrace().printStackTrace(warn);