1 package org.ibex.nestedvm;
5 import org.ibex.nestedvm.util.*;
6 import org.ibex.classgen.*;
8 // FEATURE: Use IINC where possible
9 // FEATURE: Some kind of peephole optimization
10 // FEATURE: Special mode to support single-precision only - regs are floats not ints
12 /* FEATURE: Span large binaries across several classfiles
13 * We should be able to do this with no performance penalty
14 * Every method in the inner classes is static and takes the main class as an arg
15 * This makes them look just like methods in the main class because arg1 gets loaded into
19 /* FEATURE: smarter with local regs
20 * Be even smarter with the use of local registers. We need to only load fields into
21 * local regs when they are actually used and only write to fields if the regs could have
22 * changed. This should allow us to put more regs in local vars. Right now putting all used
23 * regs local vars makes code like this slower.
25 * void work(int a, int b) {
32 * Because all the regs used in "real work" are loaded/restored even for fast path
36 public class ClassFileCompiler extends Compiler implements CGConst {
37 /** The stream to write the compiled output to */
38 private OutputStream os;
39 private PrintStream warn = System.err;
42 private MethodGen clinit;
43 private MethodGen init;
44 private Type.Object me;
45 private Type.Object superClass;
47 public ClassFileCompiler(String path, String className, OutputStream os) throws IOException { this(new Seekable.File(path),className,os); }
48 public ClassFileCompiler(Seekable binary, String className, OutputStream os) throws IOException {
49 super(binary,className);
53 public void setWarnWriter(PrintStream warn) { this.warn = warn; }
55 protected void _go() throws Exn, IOException {
58 } catch(ClassGen.Exn e) {
60 throw new Exn("Class generation exception: " + e.toString());
64 private void __go() throws Exn, IOException {
65 if(!pruneCases) throw new Exn("-o prunecases MUST be enabled for ClassFileCompiler");
68 me = new Type.Object(fullClassName);
69 superClass = new Type.Object(runtimeClass);
70 cg = new ClassGen(me,superClass,ACC_PUBLIC|ACC_FINAL|ACC_SUPER);
71 if(source != null) cg.setSourceFile(source);
74 cg.addField("pc",Type.INT,ACC_PRIVATE);
75 cg.addField("hi",Type.INT,ACC_PRIVATE);
76 cg.addField("lo",Type.INT,ACC_PRIVATE);
77 cg.addField("fcsr",Type.INT,ACC_PRIVATE);
78 for(int i=1;i<32;i++) cg.addField("r" + i,Type.INT,ACC_PRIVATE);
79 for(int i=0;i<32;i++) cg.addField("f" + i,Type.INT,ACC_PRIVATE);
81 clinit = cg.addMethod("<clinit>",Type.VOID,Type.NO_ARGS,ACC_PRIVATE|ACC_STATIC);
83 init = cg.addMethod("<init>",Type.VOID,Type.NO_ARGS,ACC_PUBLIC);
85 init.add(LDC,pageSize);
86 init.add(LDC,totalPages);
87 init.add(INVOKESPECIAL,new MethodRef(me,"<init>",Type.VOID,new Type[]{Type.INT,Type.INT}));
90 init = cg.addMethod("<init>",Type.VOID,new Type[]{Type.INT,Type.INT},ACC_PUBLIC);
94 init.add(INVOKESPECIAL,new MethodRef(superClass,"<init>",Type.VOID,new Type[]{Type.INT,Type.INT}));
97 cg.addField("page",Type.arrayType(Type.INT),ACC_PRIVATE|ACC_FINAL);
100 init.add(GETFIELD,new FieldRef(me,"readPages",Type.arrayType(Type.INT,2)));
103 init.add(PUTFIELD,new FieldRef(me,"page",Type.arrayType(Type.INT)));
107 cg.addField("symbols",new Type.Object(hashClass),ACC_PRIVATE|ACC_STATIC|ACC_FINAL);
111 for(int i=0;i<elf.sheaders.length;i++) {
112 ELF.SHeader sheader = elf.sheaders[i];
113 String name = sheader.name;
114 // if this section doesn't get loaded into our address space don't worry about it
115 if(sheader.addr == 0x0) continue;
117 highestAddr = Math.max(highestAddr, sheader.addr + sheader.size);
119 if(name.equals(".text"))
120 emitText(sheader.addr, new DataInputStream(sheader.getInputStream()),sheader.size);
121 else if(name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"))
122 emitData(sheader.addr, new DataInputStream(sheader.getInputStream()), sheader.size,name.equals(".rodata"));
123 else if(name.equals(".bss") || name.equals(".sbss"))
124 emitBSS(sheader.addr,sheader.size);
126 throw new Exn("Unknown segment: " + name);
134 Type.Object hash = new Type.Object(hashClass);
135 clinit.add(NEW,hash);
138 clinit.add(INVOKESPECIAL,new MethodRef(hash,"<init>",Type.VOID,Type.NO_ARGS));
139 clinit.add(PUTSTATIC,new FieldRef(me,"symbols",hash));
140 ELF.Symbol[] symbols = elf.getSymtab().symbols;
141 for(int i=0;i<symbols.length;i++) {
142 ELF.Symbol s = symbols[i];
143 if(s.type == ELF.Symbol.STT_FUNC && s.binding == ELF.Symbol.STB_GLOBAL && (s.name.equals("_call_helper") || !s.name.startsWith("_"))) {
145 clinit.add(LDC,s.name);
146 clinit.add(NEW,Type.INTEGER_OBJECT);
148 clinit.add(LDC,s.addr);
149 clinit.add(INVOKESPECIAL,new MethodRef(Type.INTEGER_OBJECT,"<init>",Type.VOID,new Type[]{Type.INT}));
150 clinit.add(INVOKEVIRTUAL,new MethodRef(hash,"put",Type.OBJECT,new Type[]{Type.OBJECT,Type.OBJECT}));
159 ELF.SHeader text = elf.sectionWithName(".text");
162 MethodGen tramp = cg.addMethod("trampoline",Type.VOID,Type.NO_ARGS,ACC_PRIVATE);
164 int start = tramp.size();
166 tramp.add(GETFIELD,new FieldRef(me,"state",Type.INT));
167 int stateCheck = tramp.add(IFNE);
171 tramp.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
172 tramp.add(LDC,methodShift);
175 int beg = text.addr >>> methodShift;
176 int end = ((text.addr + text.size + maxBytesPerMethod - 1) >>> methodShift);
178 MethodGen.TSI tsi = new MethodGen.TSI(beg,end-1);
179 tramp.add(TABLESWITCH,tsi);
180 for(int n=beg;n<end;n++) {
181 tsi.setTargetForVal(n,tramp.size());
182 tramp.add(INVOKESPECIAL,new MethodRef(me,"run_"+toHex(n<<methodShift),Type.VOID,Type.NO_ARGS));
183 tramp.add(GOTO,start);
185 tsi.setDefaultTarget(tramp.size());
188 tramp.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
190 tramp.add(NEW, Type.STRINGBUFFER);
192 tramp.add(LDC,"Jumped to invalid address in trampoline (r2: ");
193 tramp.add(INVOKESPECIAL,new MethodRef(Type.STRINGBUFFER,"<init>",Type.VOID,new Type[]{Type.STRING}));
195 tramp.add(GETFIELD, new FieldRef(me,"r2",Type.INT));
196 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
197 tramp.add(LDC," pc: ");
198 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.STRING}));
200 tramp.add(GETFIELD, new FieldRef(me,"pc",Type.INT));
201 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
203 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.STRING}));
204 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"toString",Type.STRING,Type.NO_ARGS));
205 tramp.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
208 tramp.setArg(stateCheck,tramp.size());
213 } catch(ClassGen.Exn e) {
214 e.printStackTrace(warn);
215 throw new Exn("Generation of the trampoline method failed. Try increasing maxInsnPerMethod");
218 addConstReturnMethod("gp",gp.addr);
219 addConstReturnMethod("entryPoint",elf.header.entry);
220 addConstReturnMethod("heapStart",highestAddr);
222 if(userInfo != null) {
223 addConstReturnMethod("userInfoBase",userInfo.addr);
224 addConstReturnMethod("userInfoSize",userInfo.size);
228 Type.Object hashClassType = new Type.Object(hashClass);
229 MethodGen ls = cg.addMethod("lookupSymbol",Type.INT,new Type[]{Type.STRING},ACC_PROTECTED);
230 ls.add(GETSTATIC,new FieldRef(me,"symbols",hashClassType));
232 ls.add(INVOKEVIRTUAL,new MethodRef(hashClassType,"get",Type.OBJECT,new Type[]{Type.OBJECT}));
234 int b = ls.add(IFNULL);
235 ls.add(CHECKCAST,Type.INTEGER_OBJECT);
236 ls.add(INVOKEVIRTUAL,new MethodRef(Type.INTEGER_OBJECT,"intValue",Type.INT,Type.NO_ARGS));
238 ls.setArg(b,ls.size());
244 Type.Object cpuStateType = new Type.Object("org.ibex.nestedvm.Runtime$CPUState");
245 MethodGen setCPUState = cg.addMethod("setCPUState",Type.VOID,new Type[]{cpuStateType},ACC_PROTECTED);
246 MethodGen getCPUState = cg.addMethod("getCPUState",Type.VOID,new Type[]{cpuStateType},ACC_PROTECTED);
248 setCPUState.add(ALOAD_1);
249 getCPUState.add(ALOAD_1);
250 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,"r",Type.arrayType(Type.INT)));
251 getCPUState.add(GETFIELD,new FieldRef(cpuStateType,"r",Type.arrayType(Type.INT)));
252 setCPUState.add(ASTORE_2);
253 getCPUState.add(ASTORE_2);
255 for(int i=1;i<32;i++) {
256 setCPUState.add(ALOAD_0);
257 setCPUState.add(ALOAD_2);
258 setCPUState.add(LDC,i);
259 setCPUState.add(IALOAD);
260 setCPUState.add(PUTFIELD,new FieldRef(me,"r"+i,Type.INT));
262 getCPUState.add(ALOAD_2);
263 getCPUState.add(LDC,i);
264 getCPUState.add(ALOAD_0);
265 getCPUState.add(GETFIELD,new FieldRef(me,"r"+i,Type.INT));
266 getCPUState.add(IASTORE);
269 setCPUState.add(ALOAD_1);
270 getCPUState.add(ALOAD_1);
271 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,"f",Type.arrayType(Type.INT)));
272 getCPUState.add(GETFIELD,new FieldRef(cpuStateType,"f",Type.arrayType(Type.INT)));
273 setCPUState.add(ASTORE_2);
274 getCPUState.add(ASTORE_2);
276 for(int i=0;i<32;i++) {
277 setCPUState.add(ALOAD_0);
278 setCPUState.add(ALOAD_2);
279 setCPUState.add(LDC,i);
280 setCPUState.add(IALOAD);
281 setCPUState.add(PUTFIELD,new FieldRef(me,"f"+i,Type.INT));
283 getCPUState.add(ALOAD_2);
284 getCPUState.add(LDC,i);
285 getCPUState.add(ALOAD_0);
286 getCPUState.add(GETFIELD,new FieldRef(me,"f"+i,Type.INT));
287 getCPUState.add(IASTORE);
290 String[] each = new String[] { "hi","lo","fcsr","pc" };
291 for(int i=0;i<each.length;i++) {
292 setCPUState.add(ALOAD_0);
293 setCPUState.add(ALOAD_1);
294 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,each[i],Type.INT));
295 setCPUState.add(PUTFIELD,new FieldRef(me,each[i],Type.INT));
297 getCPUState.add(ALOAD_1);
298 getCPUState.add(ALOAD_0);
299 getCPUState.add(GETFIELD,new FieldRef(me,each[i],Type.INT));
300 getCPUState.add(PUTFIELD,new FieldRef(cpuStateType,each[i],Type.INT));
302 setCPUState.add(RETURN);
303 getCPUState.add(RETURN);
306 MethodGen execute = cg.addMethod("_execute",Type.VOID,Type.NO_ARGS,ACC_PROTECTED);
307 int tryStart = execute.size();
308 execute.add(ALOAD_0);
309 execute.add(INVOKESPECIAL,new MethodRef(me,"trampoline",Type.VOID,Type.NO_ARGS));
310 int tryEnd = execute.size();
313 int catchInsn = execute.size();
314 execute.add(ASTORE_1);
315 execute.add(NEW, new Type.Object("org.ibex.nestedvm.Runtime$FaultException"));
317 execute.add(ALOAD_1);
318 execute.add(INVOKESPECIAL,new MethodRef("org.ibex.nestedvm.Runtime$FaultException","<init>",Type.VOID,new Type[]{new Type.Object("java.lang.RuntimeException")}));
321 execute.addExceptionHandler(tryStart,tryEnd,catchInsn,new Type.Object("java.lang.RuntimeException"));
322 execute.addThrow(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
324 MethodGen main = cg.addMethod("main",Type.VOID,new Type[]{Type.arrayType(Type.STRING)},ACC_STATIC|ACC_PUBLIC);
327 main.add(INVOKESPECIAL,new MethodRef(me,"<init>",Type.VOID,Type.NO_ARGS));
328 main.add(LDC,fullClassName);
331 Type.Object ur = new Type.Object("org.ibex.nestedvm.UnixRuntime");
332 main.add(INVOKESTATIC,new MethodRef(ur,"runAndExec",Type.INT,new Type[]{ur,Type.STRING,Type.arrayType(Type.STRING)}));
334 main.add(INVOKEVIRTUAL,new MethodRef(me,"run",Type.INT,new Type[]{Type.STRING,Type.arrayType(Type.STRING)}));
336 main.add(INVOKESTATIC,new MethodRef(new Type.Object("java.lang.System"),"exit",Type.VOID,new Type[]{Type.INT}));
342 private void addConstReturnMethod(String name, int val) {
343 MethodGen m = cg.addMethod(name,Type.INT,Type.NO_ARGS,ACC_PROTECTED);
348 private static int initDataCount;
349 private void emitData(int addr, DataInputStream dis, int size, boolean readOnly) throws Exn,IOException {
350 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Data section on weird boundaries");
351 int last = addr + size;
353 int segSize = Math.min(size,28000); // must be a multiple of 56
354 StringBuffer sb = new StringBuffer();
355 for(int i=0;i<segSize;i+=7) {
357 for(int j=0;j<7;j++) {
359 byte b = (i+j < size) ? dis.readByte() : 1;
363 sb.append((char) ((l>>>(7*(7-j)))&0x7f));
365 String fieldname = "_data" + (++initDataCount);
366 cg.addField(fieldname,Type.arrayType(Type.INT),ACC_PRIVATE|ACC_STATIC|ACC_FINAL);
368 clinit.add(LDC,sb.toString());
369 clinit.add(LDC,segSize/4);
370 clinit.add(INVOKESTATIC,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime"),"decodeData",Type.arrayType(Type.INT),new Type[]{Type.STRING,Type.INT}));
371 clinit.add(PUTSTATIC,new FieldRef(me,fieldname,Type.arrayType(Type.INT)));
374 init.add(GETSTATIC,new FieldRef(me,fieldname,Type.arrayType(Type.INT)));
376 init.add(LDC,readOnly ? 1 : 0);
377 init.add(INVOKEVIRTUAL,new MethodRef(me,"initPages",Type.VOID,new Type[]{Type.arrayType(Type.INT),Type.INT,Type.BOOLEAN}));
385 private void emitBSS(int addr, int size) throws Exn {
386 if((addr&3)!=0) throw new Exn("BSS section on weird boundaries");
393 init.add(INVOKEVIRTUAL,new MethodRef(me,"clearPages",Type.VOID,new Type[]{Type.INT,Type.INT}));
397 private boolean textDone; // a text segment was already processed
398 private int startOfMethod = 0; // the start of this method (not necessarily the first instruction)
399 private int endOfMethod = 0; // the maximum end of this method (could end before it is full)
400 private boolean unreachable = false; // is the current pc is reachable
402 private MethodGen.PhantomTarget returnTarget; // where to jump when exiting the method
403 private MethodGen.PhantomTarget defaultTarget; // the default switch target (throws exn)
404 private MethodGen.PhantomTarget[] insnTargets; // the targets for each jumpable instruction
405 private MethodGen mg; // the method itself
407 private boolean jumpable(int addr) { return jumpableAddresses.get(new Integer(addr)) != null; }
409 private void emitText(int addr, DataInputStream dis, int size) throws Exn,IOException {
410 if(textDone) throw new Exn("Multiple text segments");
413 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Section on weird boundaries");
415 int insn,nextInsn=-1;
416 boolean skipNext = true;
418 for(int i=0;i<count;i++,addr+=4) {
419 insn = skipNext ? dis.readInt() : nextInsn;
420 nextInsn = (i == count-1) ? -1 : dis.readInt();
421 if(addr >= endOfMethod) { endMethod(addr); startMethod(addr); }
422 if(insnTargets[(addr-startOfMethod)/4] != null) {
423 insnTargets[(addr-startOfMethod)/4].setTarget(mg.size());
425 } else if(unreachable) {
429 skipNext = emitInstruction(addr,insn,nextInsn);
430 } catch(RuntimeException e) {
431 warn.println("Exception at " + toHex(addr));
434 if(skipNext) { addr+=4; i++; }
441 private void startMethod(int first) {
442 startOfMethod = first & methodMask;
443 endOfMethod = startOfMethod + maxBytesPerMethod;
445 mg = cg.addMethod("run_" + toHex(startOfMethod),Type.VOID,Type.NO_ARGS,ACC_PRIVATE|ACC_FINAL);
448 mg.add(GETFIELD,new FieldRef(me,"page",Type.arrayType(Type.INT)));
452 mg.add(GETFIELD,new FieldRef(me,"readPages",Type.arrayType(Type.INT,2)));
455 mg.add(GETFIELD,new FieldRef(me,"writePages",Type.arrayType(Type.INT,2)));
459 returnTarget = new MethodGen.PhantomTarget();
460 insnTargets = new MethodGen.PhantomTarget[maxBytesPerMethod/4];
462 int[] buf = new int[maxBytesPerMethod/4];
463 Object[] targetBuf = new Object[maxBytesPerMethod/4];
465 for(int addr=first;addr<endOfMethod;addr+=4) {
467 targetBuf[n] = insnTargets[(addr-startOfMethod)/4] = new MethodGen.PhantomTarget();
473 MethodGen.LSI lsi = new MethodGen.LSI(n);
474 System.arraycopy(buf,0,lsi.vals,0,n);
475 System.arraycopy(targetBuf,0,lsi.targets,0,n);
476 lsi.setDefaultTarget(defaultTarget = new MethodGen.PhantomTarget());
481 mg.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
482 mg.add(LOOKUPSWITCH,lsi);
485 private void endMethod(int firstAddrOfNext) {
486 if(startOfMethod == 0) return;
490 mg.add(LDC,firstAddrOfNext);
492 // mark the start of the next method as jumpable
493 jumpableAddresses.put(new Integer(firstAddrOfNext),Boolean.TRUE);
496 returnTarget.setTarget(mg.size());
502 defaultTarget.setTarget(mg.size());
505 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
507 mg.add(NEW,Type.STRINGBUFFER);
509 mg.add(LDC,"Jumped to invalid address: ");
510 mg.add(INVOKESPECIAL,new MethodRef(Type.STRINGBUFFER,"<init>",Type.VOID,new Type[]{Type.STRING}));
512 mg.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
513 mg.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
514 mg.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"toString",Type.STRING,Type.NO_ARGS));
515 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
518 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
520 mg.add(LDC,"Jumped to invalid address");
521 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
525 endOfMethod = startOfMethod = 0;
529 private void leaveMethod() {
530 mg.add(GOTO,returnTarget);
533 private void branch(int pc, int target) {
534 if((pc&methodMask) == (target&methodMask)) {
535 mg.add(GOTO,insnTargets[(target-startOfMethod)/4]);
544 // This assumes everything needed by ifInsn is already on the stack
545 private boolean doIfInstruction(byte op, int pc, int target, int nextInsn) throws Exn {
546 emitInstruction(-1,nextInsn,-1); // delay slot
547 if((target&methodMask) == (pc&methodMask)) {
548 mg.add(op,insnTargets[(target-startOfMethod)/4]);
550 int h = mg.add(MethodGen.negate(op));
552 mg.setArg(h,mg.size());
554 if(!jumpable(pc+4)) return true; // done - skip it
556 //System.err.println("Delay slot is jumpable - This code is untested + " + toHex(nextInsn));
557 if(pc+4==endOfMethod) {
558 // the delay slot is at the start of the next method
559 jumpableAddresses.put(new Integer(pc+8),Boolean.TRUE); // make the 2nd insn of the next method jumpable
560 branch(pc,pc+8); // jump over it
561 //System.err.println("delay slot: " + toHex(pc+8)); */
563 return false; // we still need to output it
565 //System.err.println("jumped over delay slot: " + toHex(pc+4));
566 // add another copy and jump over
568 int b = mg.add(GOTO);
569 insnTargets[(pc+4-startOfMethod)/4].setTarget(mg.size());
570 emitInstruction(-1,nextInsn,01); // delay slot
571 mg.setArg(b,mg.size());
577 private static final Float POINT_5_F = new Float(0.5f);
578 private static final Double POINT_5_D = new Double(0.5f);
579 private static final Long FFFFFFFF = new Long(0xffffffffL);
581 private boolean emitInstruction(int pc, int insn, int nextInsn) throws Exn {
582 MethodGen mg = this.mg; // smaller bytecode
583 if(insn == -1) throw new Exn("insn is -1");
585 int op = (insn >>> 26) & 0xff; // bits 26-31
586 int rs = (insn >>> 21) & 0x1f; // bits 21-25
587 int rt = (insn >>> 16) & 0x1f; // bits 16-20
588 int ft = (insn >>> 16) & 0x1f;
589 int rd = (insn >>> 11) & 0x1f; // bits 11-15
590 int fs = (insn >>> 11) & 0x1f;
591 int shamt = (insn >>> 6) & 0x1f; // bits 6-10
592 int fd = (insn >>> 6) & 0x1f;
593 int subcode = insn & 0x3f; // bits 0-5
594 int breakCode = (insn >>> 6) & 0xfffff; // bits 6-20
596 int jumpTarget = (insn & 0x03ffffff); // bits 0-25
597 int unsignedImmediate = insn & 0xffff;
598 int signedImmediate = (insn << 16) >> 16;
599 int branchTarget = signedImmediate;
651 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
652 emitInstruction(-1,nextInsn,-1);
660 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
661 emitInstruction(-1,nextInsn,-1);
677 // FEATURE: This is actually broken, but it happens to work for our code
678 // a func could theoretically jump back to here from a future point
679 restoreChangedRegs();
690 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}));
694 mg.add(GETFIELD,new FieldRef(me,"state",Type.INT));
700 mg.setArg(b1,mg.size());
703 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
705 mg.add(LDC,"BREAK Code " + toHex(breakCode));
706 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
740 mg.add(SWAP); //a(InstructionConstants.SWAP);
747 mg.add(SWAP); //a(InstructionConstants.SWAP);
754 mg.add(LDC,FFFFFFFF);
758 mg.add(LDC,FFFFFFFF);
800 mg.add(LDC,FFFFFFFF);
805 mg.add(LDC,FFFFFFFF);
822 mg.setArg(b1,mg.size());
827 throw new Exn("ADD (add with oveflow trap) not suported");
830 if(rt != 0 && rs != 0) {
842 throw new Exn("SUB (add with oveflow trap) not suported");
845 if(rt != 0 && rs != 0) {
880 if(rs != 0 || rt != 0) {
881 if(rs != 0 && rt != 0) {
902 b1 = mg.add(IF_ICMPLT);
905 mg.setArg(b1,mg.add(ICONST_1));
906 mg.setArg(b2,mg.size());
918 mg.add(LDC,FFFFFFFF);
922 mg.add(LDC,FFFFFFFF);
932 mg.setArg(b1,mg.add(ICONST_1));
933 mg.setArg(b2,mg.size());
940 throw new Exn("Illegal instruction 0/" + subcode);
947 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
949 return doIfInstruction(IFLT,pc,pc+branchTarget*4+4,nextInsn);
951 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
953 return doIfInstruction(IFGE,pc,pc+branchTarget*4+4,nextInsn);
955 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
958 emitInstruction(-1,nextInsn,-1);
962 branch(pc,pc+branchTarget*4+4);
963 mg.setArg(b1,mg.size());
966 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
968 if(rs != 0) { // r0 is always >= 0
972 emitInstruction(-1,nextInsn,-1);
976 branch(pc,pc+branchTarget*4+4);
977 if(b1 != -1) mg.setArg(b1,mg.size());
978 if(b1 == -1) unreachable = true;
981 throw new Exn("Illegal Instruction 1/" + rt);
986 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
987 emitInstruction(-1,nextInsn,-1);
988 branch(pc,(pc&0xf0000000)|(jumpTarget << 2));
993 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
994 int target = (pc&0xf0000000)|(jumpTarget << 2);
995 emitInstruction(-1,nextInsn,-1);
1004 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1006 emitInstruction(-1,nextInsn,-1);
1007 branch(pc,pc+branchTarget*4+4);
1009 } else if(rs == 0 || rt == 0) {
1010 pushReg(rt == 0 ? R+rs : R+rt);
1011 return doIfInstruction(IFEQ,pc,pc+branchTarget*4+4,nextInsn);
1015 return doIfInstruction(IF_ICMPEQ,pc,pc+branchTarget*4+4,nextInsn);
1019 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1022 return doIfInstruction(IFNE,pc,pc+branchTarget*4+4,nextInsn);
1025 return doIfInstruction(IF_ICMPNE,pc,pc+branchTarget*4+4,nextInsn);
1028 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1030 return doIfInstruction(IFLE,pc,pc+branchTarget*4+4,nextInsn);
1032 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1034 return doIfInstruction(IFGT,pc,pc+branchTarget*4+4,nextInsn);
1036 throw new Exn("ADDI (add immediate with oveflow trap) not suported");
1039 addiu(rs,signedImmediate);
1045 mg.add(LDC,signedImmediate);
1046 b1 = mg.add(IF_ICMPLT);
1049 mg.setArg(b1,mg.add(ICONST_1));
1050 mg.setArg(b2,mg.size());
1057 mg.add(LDC,FFFFFFFF);
1059 // Yes, this is correct, you have to sign extend the immediate then do an UNSIGNED comparison
1060 mg.add(LDC,new Long(signedImmediate&0xffffffffL));
1066 mg.setArg(b1,mg.add(ICONST_1));
1067 mg.setArg(b2,mg.size());
1073 mg.add(LDC,unsignedImmediate);
1079 if(rs != 0 && unsignedImmediate != 0) {
1081 mg.add(LDC,unsignedImmediate);
1086 mg.add(LDC,unsignedImmediate);
1093 mg.add(LDC,unsignedImmediate);
1099 mg.add(LDC,unsignedImmediate << 16);
1103 throw new Exn("TLB/Exception support not implemented");
1112 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
1126 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
1131 case 8: {// BC1F, BC1T
1133 mg.add(LDC,0x800000);
1135 return doIfInstruction(((insn>>>16)&1) == 0 ? IFEQ : IFNE,pc,pc+branchTarget*4+4,nextInsn);
1139 { // Single/Double math
1140 boolean d = rs == 17;
1143 preSetDouble(F+fd,d);
1146 mg.add(d ? DADD : FADD);
1150 preSetDouble(F+fd,d);
1153 mg.add(d ? DSUB : FSUB);
1157 preSetDouble(F+fd,d);
1160 mg.add(d ? DMUL : FMUL);
1164 preSetDouble(F+fd,d);
1167 mg.add(d ? DDIV : FDIV);
1171 preSetDouble(F+fd,d);
1172 // NOTE: We can't use fneg/dneg here since they'll turn +0.0 into -0.0
1175 mg.add(d ? DUP2 : DUP);
1176 mg.add(d ? DCONST_0 : FCONST_0);
1177 mg.add(d ? DCMPG : FCMPG);
1180 mg.add(d ? DCONST_0 : FCONST_0);
1187 mg.add(d ? DSUB : FSUB);
1189 mg.setArg(b1,mg.size());
1206 preSetDouble(F+fd,d);
1208 mg.add(d ? DNEG : FNEG);
1223 case 36: { // CVT.W.D
1224 MethodGen.TSI tsi = new MethodGen.TSI(0,3);
1230 mg.add(TABLESWITCH,tsi);
1232 // Round towards plus infinity
1233 tsi.setTarget(2,mg.size());
1234 if(!d) mg.add(F2D); // Ugh.. java.lang.Math doesn't have a float ceil/floor
1235 mg.add(INVOKESTATIC,new MethodRef("java.lang.Math","ceil",Type.DOUBLE,new Type[]{Type.DOUBLE}));
1240 tsi.setTarget(0,mg.size());
1241 mg.add(LDC,d ? (Object)POINT_5_D : (Object)POINT_5_F);
1242 mg.add(d ? DADD : FADD);
1245 // Round towards minus infinity
1246 tsi.setTarget(3,mg.size());
1248 mg.add(INVOKESTATIC,new MethodRef("java.lang.Math","floor",Type.DOUBLE,new Type[]{Type.DOUBLE}));
1251 tsi.setTarget(1,mg.size());
1252 tsi.setDefaultTarget(mg.size());
1253 mg.setArg(b1,mg.size());
1255 mg.add(d ? D2I : F2I);
1265 mg.add(LDC,~0x800000);
1269 mg.add(d ? DCMPG : FCMPG);
1271 case 50: b1 = mg.add(IFNE); break;
1272 case 60: b1 = mg.add(IFGE); break;
1273 case 62: b1 = mg.add(IFGT); break;
1276 mg.add(LDC,0x800000);
1278 mg.setArg(b1,mg.size());
1281 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
1285 case 20: { // Integer
1299 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
1304 throw new Exn("Invalid Instruction 17/" + rs);
1309 throw new Exn("coprocessor 2 and 3 instructions not available");
1312 addiu(R+rs,signedImmediate);
1332 addiu(R+rs,signedImmediate);
1352 addiu(R+rs,signedImmediate);
1356 mg.add(LDC,0x00ffffff);
1387 memRead(R+rs,signedImmediate);
1392 addiu(R+rs,signedImmediate);
1413 addiu(R+rs,signedImmediate);
1428 // chars are unsigend so this works
1435 addiu(R+rs,signedImmediate);
1439 mg.add(LDC,0xffffff00);
1468 addiu(R+rs,signedImmediate);
1471 // FEATURE: DO the preMemRead(true) thing for the rest of the S* instructions
1476 mg.add(LDC,0xff000000);
1513 addiu(R+rs,signedImmediate);
1559 addiu(R+rs,signedImmediate);
1569 mg.add(LDC,0xffffff00);
1597 preMemWrite2(R+rs,signedImmediate);
1604 addiu(R+rs,signedImmediate);
1614 mg.add(LDC,0x00ffffff);
1639 // This need to be atomic if we ever support threads (see SWC0/SC)
1642 memRead(R+rs,signedImmediate);
1648 memRead(R+rs,signedImmediate);
1652 /* This needs to fail (set rt to 0) if the memory location was modified
1653 * between the LL and SC if we ever support threads.
1658 preMemWrite2(R+rs,signedImmediate);
1667 preMemWrite2(R+rs,signedImmediate);
1672 throw new Exn("Invalid Instruction: " + op + " at " + toHex(pc));
1677 // Helper functions for emitText
1679 private static final int R = 0;
1680 private static final int F = 32;
1681 private static final int HI = 64;
1682 private static final int LO = 65;
1683 private static final int FCSR = 66;
1684 private static final int REG_COUNT=67;
1686 private int[] regLocalMapping = new int[REG_COUNT];
1687 private int[] regLocalReadCount = new int[REG_COUNT];
1688 private int[] regLocalWriteCount = new int[REG_COUNT];
1689 private int nextAvailLocal;
1690 private int loadsStart;
1691 private static final int MAX_LOCALS = 4;
1692 private static final int LOAD_LENGTH = 3;
1694 private boolean doLocal(int reg) {
1695 return reg == R+2 || reg == R+3 || reg == R+4 || reg == R+29;
1698 private int getLocalForReg(int reg) {
1699 if(regLocalMapping[reg] != 0) return regLocalMapping[reg];
1700 if(nextAvailLocal == 0) nextAvailLocal = onePage ? 3 : 4;
1701 regLocalMapping[reg] = nextAvailLocal++;
1702 return regLocalMapping[reg];
1705 private void fixupRegsStart() {
1706 for(int i=0;i<REG_COUNT;i++)
1707 regLocalMapping[i] = regLocalReadCount[i] = regLocalWriteCount[i] = 0;
1709 loadsStart = mg.size();
1710 for(int i=0;i<MAX_LOCALS*LOAD_LENGTH;i++)
1714 private void fixupRegsEnd() {
1716 for(int i=0;i<REG_COUNT;i++) {
1717 if(regLocalMapping[i] == 0) continue;
1718 mg.set(p++,ALOAD_0);
1719 mg.set(p++,GETFIELD,new FieldRef(me,regField(i),Type.INT));
1720 mg.set(p++,ISTORE,regLocalMapping[i]);
1722 if(regLocalWriteCount[i] > 0) {
1724 mg.add(ILOAD,regLocalMapping[i]);
1725 mg.add(PUTFIELD,new FieldRef(me,regField(i),Type.INT));
1730 private void restoreChangedRegs() {
1731 for(int i=0;i<REG_COUNT;i++) {
1732 if(regLocalWriteCount[i] > 0) {
1734 mg.add(ILOAD,regLocalMapping[i]);
1735 mg.add(PUTFIELD,new FieldRef(me,regField(i),Type.INT));
1740 private static final String[] regField = {
1741 "r0","r1","r2","r3","r4","r5","r6","r7",
1742 "r8","r9","r10","r11","r12","r13","r14","r15",
1743 "r16","r17","r18","r19","r20","r21","r22","r23",
1744 "r24","r25","r26","r27","r28","r29","r30","r31",
1746 "f0","f1","f2","f3","f4","f5","f6","f7",
1747 "f8","f9","f10","f11","f12","f13","f14","f15",
1748 "f16","f17","f18","f19","f20","f21","f22","f23",
1749 "f24","f25","f26","f27","f28","f29","f30","f31",
1754 private static String regField(int reg) { return regField[reg]; }
1756 private int pushRegWZ(int reg) {
1758 warn.println("Warning: Pushing r0!");
1759 new Exception().printStackTrace(warn);
1761 return pushRegZ(reg);
1764 private int pushRegZ(int reg) {
1765 if(reg == R+0) return mg.add(ICONST_0);
1766 else return pushReg(reg);
1770 private int pushReg(int reg) {
1773 regLocalReadCount[reg]++;
1774 mg.add(ILOAD,getLocalForReg(reg));
1778 mg.add(GETFIELD,new FieldRef(me,regField(reg),Type.INT));
1783 private int preSetRegStackPos;
1784 private int[] preSetRegStack = new int[8];
1786 // This can push ONE or ZERO words to the stack. If it pushed one it returns true
1787 private boolean preSetReg(int reg) {
1788 regField(reg); // just to check for validity
1789 preSetRegStack[preSetRegStackPos] = reg;
1790 preSetRegStackPos++;
1799 private int setReg() {
1800 if(preSetRegStackPos==0) throw new RuntimeException("didn't do preSetReg");
1801 preSetRegStackPos--;
1802 int reg = preSetRegStack[preSetRegStackPos];
1805 mg.add(ISTORE,getLocalForReg(reg));
1806 regLocalWriteCount[reg]++;
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 pushFloat(int reg) throws CompilationException { return pushDouble(reg,false); }
1819 //unused - private InstructionHandle pushDouble(int reg) throws CompilationException { return pushDouble(reg,true); }
1820 private int pushDouble(int reg, boolean d) throws Exn {
1821 if(reg < F || reg >= F+32) throw new IllegalArgumentException(""+reg);
1824 if(reg == F+31) throw new Exn("Tried to use a double in f31");
1831 mg.add(LDC,FFFFFFFF);
1834 mg.add(INVOKESTATIC,new MethodRef(Type.DOUBLE_OBJECT,"longBitsToDouble",Type.DOUBLE,new Type[]{Type.LONG}));
1837 mg.add(INVOKESTATIC,new MethodRef("java.lang.Float","intToFloatBits",Type.FLOAT,new Type[]{Type.INT}));
1842 private void preSetFloat(int reg) { preSetDouble(reg,false); }
1843 private void preSetDouble(int reg) { preSetDouble(reg,true); }
1844 private void preSetDouble(int reg, boolean d) { preSetReg(reg); }
1846 private int setFloat() throws Exn { return setDouble(false); }
1847 private int setDouble() throws Exn { return setDouble(true); }
1848 private int setDouble(boolean d) throws Exn {
1849 int reg = preSetRegStack[preSetRegStackPos-1];
1850 if(reg < F || reg >= F+32) throw new IllegalArgumentException(""+reg);
1853 if(reg == F+31) throw new Exn("Tried to use a double in f31");
1854 mg.add(INVOKESTATIC,new MethodRef(Type.DOUBLE_OBJECT,"doubleToLongBits",Type.LONG,new Type[]{Type.DOUBLE}));
1859 if(preSetReg(reg+1))
1863 setReg(); // preSetReg was already done for this by preSetDouble
1865 //h = a(fac.createInvoke("java.lang.Float","floatToRawIntBits",Type.INT,new Type[]{Type.FLOAT},INVOKESTATIC));
1866 mg.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"floatToRawIntBits",Type.INT,new Type[]{Type.FLOAT}));
1872 private void pushTmp() { mg.add(ILOAD_1); }
1873 private void setTmp() { mg.add(ISTORE_1); }
1875 private void addiu(int reg, int offset) {
1876 if(reg != R+0 && offset != 0) {
1880 } else if(reg != R+0) {
1886 private int memWriteStage;
1887 private void preMemWrite1() {
1888 if(memWriteStage!=0) throw new Error("pending preMemWrite1/2");
1898 private void preMemWrite2(int reg, int offset) {
1903 private void preMemWrite2() { preMemWrite2(false); }
1904 private void preMemWrite2(boolean addrInTmp) {
1905 if(memWriteStage!=1) throw new Error("pending preMemWrite2 or no preMemWrite1");
1908 if(nullPointerCheck) {
1912 mg.add(INVOKEVIRTUAL,new MethodRef(me,"nullPointerCheck",Type.VOID,new Type[]{Type.INT}));
1918 } else if(fastMem) {
1921 mg.add(LDC,pageShift);
1930 mg.add(LDC,(pageSize>>2)-1);
1935 // pops an address and value off the stack, sets *addr to value
1936 private void memWrite() {
1937 if(memWriteStage!=2) throw new Error("didn't do preMemWrite1 or preMemWrite2");
1942 } else if(fastMem) {
1945 mg.add(INVOKEVIRTUAL,new MethodRef(me,"unsafeMemWrite",Type.VOID,new Type[]{Type.INT,Type.INT}));
1950 // reads the word at r[reg]+offset
1951 private void memRead(int reg, int offset) {
1957 private boolean didPreMemRead;
1958 private boolean preMemReadDoPreWrite;
1960 private void preMemRead() { preMemRead(false); }
1961 private void preMemRead(boolean preWrite) {
1962 if(didPreMemRead) throw new Error("pending preMemRead");
1963 didPreMemRead = true;
1964 preMemReadDoPreWrite = preWrite;
1968 mg.add(ALOAD,preWrite ? 3 : 2);
1972 // memRead pops an address off the stack, reads the value at that addr, and pushed the value
1973 // preMemRead MUST be called BEFORE the addresses is pushed
1974 private void memRead() { memRead(false); }
1976 private void memRead(boolean addrInTmp) {
1977 if(!didPreMemRead) throw new Error("didn't do preMemRead");
1978 didPreMemRead = false;
1979 if(preMemReadDoPreWrite)
1982 if(nullPointerCheck) {
1986 mg.add(INVOKEVIRTUAL,new MethodRef(me,"nullPointerCheck",Type.VOID,new Type[]{Type.INT}));
1992 if(preMemReadDoPreWrite)
1995 } else if(fastMem) {
1998 mg.add(LDC,pageShift);
2007 mg.add(LDC,(pageSize>>2)-1);
2009 if(preMemReadDoPreWrite)
2014 if(preMemReadDoPreWrite)
2016 mg.add(INVOKEVIRTUAL,new MethodRef(me,"unsafeMemRead",Type.INT,new Type[]{Type.INT}));
2021 // This might come in handy for something else
2022 /*private boolean touchesReg(int insn, int reg) {
2023 if((reg < R+0 || reg >= R+32) && reg != FCSR) throw new IllegalArgumentException(""+reg);
2024 if(reg == R+0) return false; // r0 is never modified
2025 int op = (insn >>> 26) & 0xff; // bits 26-31
2026 int subcode = insn & 0x3f; // bits 0-5
2027 int rd = (insn >>> 11) & 0x1f; // bits 11-15
2028 int rt = (insn >>> 16) & 0x1f; // bits 16-20
2029 int rs = (insn >>> 21) & 0x1f; // bits 21-25
2033 if(subcode >= 0 && subcode <= 7) return reg == R+rd; // Shift ops
2034 if(subcode >= 32 && subcode <= 43) return reg == R+rd; // Other math ops
2035 if(subcode >= 24 && subcode <= 27) return reg == HI || reg == LO; // MULT/DIV
2037 case 13: return false; // BREAK
2040 case 0: return reg == R+rt; // MFC.1
2041 case 2: return reg == R+rt; // CFC.1
2042 case 4: return false; // MTC.1
2043 case 6: return false; // CTC.1
2046 if(subcode == 50 || subcode == 60 || subcode == 62) return reg == FCSR;
2047 return false; // everything else just touches f0-f31
2048 case 20: return false; // Integer - just touches f0-f31
2052 if(op >= 8 && op <= 15) return reg == R+rt; // XXXI instructions
2053 if(op >= 40 && op <= 46) return false; // Memory WRITE ops
2054 if(op == 49) return reg == F+rt; // LWC1
2055 if(op == 57) return false; // SWC1
2058 warn.println("Unknown instruction in touchesReg()- assuming it modifies all regs " + op + " " + subcode);
2059 new Exception().fillInStackTrace().printStackTrace(warn);