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 {
56 if(lessConstants) throw new Exn("ClassFileCompiler doesn't support -o lessconstants");
57 if(!pruneCases) throw new Exn("-o prunecases MUST be enabled for ClassFileCompiler");
60 me = new Type.Object(fullClassName);
61 superClass = new Type.Object(runtimeClass);
62 cg = new ClassGen(me,superClass,ACC_PUBLIC|ACC_FINAL|ACC_SUPER);
63 if(source != null) cg.setSourceFile(source);
66 cg.addField("pc",Type.INT,ACC_PRIVATE);
67 cg.addField("hi",Type.INT,ACC_PRIVATE);
68 cg.addField("lo",Type.INT,ACC_PRIVATE);
69 cg.addField("fcsr",Type.INT,ACC_PRIVATE);
70 for(int i=1;i<32;i++) cg.addField("r" + i,Type.INT,ACC_PRIVATE);
71 for(int i=0;i<32;i++) cg.addField("f" + i,Type.INT,ACC_PRIVATE);
73 clinit = cg.addMethod("<clinit>",Type.VOID,Type.NO_ARGS,ACC_PRIVATE|ACC_STATIC);
75 init = cg.addMethod("<init>",Type.VOID,Type.NO_ARGS,ACC_PUBLIC);
77 init.add(LDC,pageSize);
78 init.add(LDC,totalPages);
79 init.add(INVOKESPECIAL,new MethodRef(me,"<init>",Type.VOID,new Type[]{Type.INT,Type.INT}));
82 init = cg.addMethod("<init>",Type.VOID,new Type[]{Type.INT,Type.INT},ACC_PUBLIC);
86 init.add(INVOKESPECIAL,new MethodRef(superClass,"<init>",Type.VOID,new Type[]{Type.INT,Type.INT}));
89 cg.addField("page",Type.arrayType(Type.INT),ACC_PRIVATE|ACC_FINAL);
92 init.add(GETFIELD,new FieldRef(me,"readPages",Type.arrayType(Type.INT,2)));
95 init.add(PUTFIELD,new FieldRef(me,"page",Type.arrayType(Type.INT)));
99 cg.addField("symbols",new Type.Object(hashClass),ACC_PRIVATE|ACC_STATIC|ACC_FINAL);
103 for(int i=0;i<elf.sheaders.length;i++) {
104 ELF.SHeader sheader = elf.sheaders[i];
105 String name = sheader.name;
106 // if this section doesn't get loaded into our address space don't worry about it
107 if(sheader.addr == 0x0) continue;
109 highestAddr = Math.max(highestAddr, sheader.addr + sheader.size);
111 if(name.equals(".text"))
112 emitText(sheader.addr, new DataInputStream(sheader.getInputStream()),sheader.size);
113 else if(name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"))
114 emitData(sheader.addr, new DataInputStream(sheader.getInputStream()), sheader.size,name.equals(".rodata"));
115 else if(name.equals(".bss") || name.equals(".sbss"))
116 emitBSS(sheader.addr,sheader.size);
118 throw new Exn("Unknown segment: " + name);
126 Type.Object hash = new Type.Object(hashClass);
127 clinit.add(NEW,hash);
130 clinit.add(INVOKESPECIAL,new MethodRef(hash,"<init>",Type.VOID,Type.NO_ARGS));
131 clinit.add(PUTSTATIC,new FieldRef(me,"symbols",hash));
132 ELF.Symbol[] symbols = elf.getSymtab().symbols;
133 for(int i=0;i<symbols.length;i++) {
134 ELF.Symbol s = symbols[i];
135 if(s.type == ELF.Symbol.STT_FUNC && s.binding == ELF.Symbol.STB_GLOBAL && (s.name.equals("_call_helper") || !s.name.startsWith("_"))) {
137 clinit.add(LDC,s.name);
138 clinit.add(NEW,Type.INTEGER_OBJECT);
140 clinit.add(LDC,s.addr);
141 clinit.add(INVOKESPECIAL,new MethodRef(Type.INTEGER_OBJECT,"<init>",Type.VOID,new Type[]{Type.INT}));
142 clinit.add(INVOKEVIRTUAL,new MethodRef(hash,"put",Type.OBJECT,new Type[]{Type.OBJECT,Type.OBJECT}));
151 ELF.SHeader text = elf.sectionWithName(".text");
154 MethodGen tramp = cg.addMethod("trampoline",Type.VOID,Type.NO_ARGS,ACC_PRIVATE);
156 int start = tramp.size();
158 tramp.add(GETFIELD,new FieldRef(me,"state",Type.INT));
159 int stateCheck = tramp.add(IFNE);
163 tramp.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
164 tramp.add(LDC,methodShift);
167 int beg = text.addr >>> methodShift;
168 int end = ((text.addr + text.size + maxBytesPerMethod - 1) >>> methodShift);
170 MethodGen.TSI tsi = new MethodGen.TSI(beg,end-1);
171 tramp.add(TABLESWITCH,tsi);
172 for(int n=beg;n<end;n++) {
173 tsi.setTargetForVal(n,tramp.size());
174 tramp.add(INVOKESPECIAL,new MethodRef(me,"run_"+toHex(n<<methodShift),Type.VOID,Type.NO_ARGS));
175 tramp.add(GOTO,start);
177 tsi.setDefaultTarget(tramp.size());
180 tramp.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
182 tramp.add(NEW, Type.STRINGBUFFER);
184 tramp.add(LDC,"Jumped to invalid address in trampoline (r2: ");
185 tramp.add(INVOKESPECIAL,new MethodRef(Type.STRINGBUFFER,"<init>",Type.VOID,new Type[]{Type.STRING}));
187 tramp.add(GETFIELD, new FieldRef(me,"r2",Type.INT));
188 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
189 tramp.add(LDC," pc: ");
190 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.STRING}));
192 tramp.add(GETFIELD, new FieldRef(me,"pc",Type.INT));
193 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
195 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.STRING}));
196 tramp.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"toString",Type.STRING,Type.NO_ARGS));
197 tramp.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
200 tramp.setArg(stateCheck,tramp.size());
205 } catch(ClassGen.Exn e) {
206 e.printStackTrace(warn);
207 throw new Exn("Generation of the trampoline method failed. Try increasing maxInsnPerMethod");
210 addConstReturnMethod("gp",gp.addr);
211 addConstReturnMethod("entryPoint",elf.header.entry);
212 addConstReturnMethod("heapStart",highestAddr);
214 if(userInfo != null) {
215 addConstReturnMethod("userInfoBase",userInfo.addr);
216 addConstReturnMethod("userInfoSize",userInfo.size);
220 Type.Object hashClassType = new Type.Object(hashClass);
221 MethodGen ls = cg.addMethod("lookupSymbol",Type.INT,new Type[]{Type.STRING},ACC_PROTECTED);
222 ls.add(GETSTATIC,new FieldRef(me,"symbols",hashClassType));
224 ls.add(INVOKEVIRTUAL,new MethodRef(hashClassType,"get",Type.OBJECT,new Type[]{Type.OBJECT}));
226 int b = ls.add(IFNULL);
227 ls.add(CHECKCAST,Type.INTEGER_OBJECT);
228 ls.add(INVOKEVIRTUAL,new MethodRef(Type.INTEGER_OBJECT,"intValue",Type.INT,Type.NO_ARGS));
230 ls.setArg(b,ls.size());
236 Type.Object cpuStateType = new Type.Object("org.ibex.nestedvm.Runtime$CPUState");
237 MethodGen setCPUState = cg.addMethod("setCPUState",Type.VOID,new Type[]{cpuStateType},ACC_PROTECTED);
238 MethodGen getCPUState = cg.addMethod("getCPUState",Type.VOID,new Type[]{cpuStateType},ACC_PROTECTED);
240 setCPUState.add(ALOAD_1);
241 getCPUState.add(ALOAD_1);
242 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,"r",Type.arrayType(Type.INT)));
243 getCPUState.add(GETFIELD,new FieldRef(cpuStateType,"r",Type.arrayType(Type.INT)));
244 setCPUState.add(ASTORE_2);
245 getCPUState.add(ASTORE_2);
247 for(int i=1;i<32;i++) {
248 setCPUState.add(ALOAD_0);
249 setCPUState.add(ALOAD_2);
250 setCPUState.add(LDC,i);
251 setCPUState.add(IALOAD);
252 setCPUState.add(PUTFIELD,new FieldRef(me,"r"+i,Type.INT));
254 getCPUState.add(ALOAD_2);
255 getCPUState.add(LDC,i);
256 getCPUState.add(ALOAD_0);
257 getCPUState.add(GETFIELD,new FieldRef(me,"r"+i,Type.INT));
258 getCPUState.add(IASTORE);
261 setCPUState.add(ALOAD_1);
262 getCPUState.add(ALOAD_1);
263 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,"f",Type.arrayType(Type.INT)));
264 getCPUState.add(GETFIELD,new FieldRef(cpuStateType,"f",Type.arrayType(Type.INT)));
265 setCPUState.add(ASTORE_2);
266 getCPUState.add(ASTORE_2);
268 for(int i=0;i<32;i++) {
269 setCPUState.add(ALOAD_0);
270 setCPUState.add(ALOAD_2);
271 setCPUState.add(LDC,i);
272 setCPUState.add(IALOAD);
273 setCPUState.add(PUTFIELD,new FieldRef(me,"f"+i,Type.INT));
275 getCPUState.add(ALOAD_2);
276 getCPUState.add(LDC,i);
277 getCPUState.add(ALOAD_0);
278 getCPUState.add(GETFIELD,new FieldRef(me,"f"+i,Type.INT));
279 getCPUState.add(IASTORE);
282 String[] each = new String[] { "hi","lo","fcsr","pc" };
283 for(int i=0;i<each.length;i++) {
284 setCPUState.add(ALOAD_0);
285 setCPUState.add(ALOAD_1);
286 setCPUState.add(GETFIELD,new FieldRef(cpuStateType,each[i],Type.INT));
287 setCPUState.add(PUTFIELD,new FieldRef(me,each[i],Type.INT));
289 getCPUState.add(ALOAD_1);
290 getCPUState.add(ALOAD_0);
291 getCPUState.add(GETFIELD,new FieldRef(me,each[i],Type.INT));
292 getCPUState.add(PUTFIELD,new FieldRef(cpuStateType,each[i],Type.INT));
294 setCPUState.add(RETURN);
295 getCPUState.add(RETURN);
298 MethodGen execute = cg.addMethod("_execute",Type.VOID,Type.NO_ARGS,ACC_PROTECTED);
299 int tryStart = execute.size();
300 execute.add(ALOAD_0);
301 execute.add(INVOKESPECIAL,new MethodRef(me,"trampoline",Type.VOID,Type.NO_ARGS));
302 int tryEnd = execute.size();
305 int catchInsn = execute.size();
306 execute.add(ASTORE_1);
307 execute.add(NEW, new Type.Object("org.ibex.nestedvm.Runtime$FaultException"));
309 execute.add(ALOAD_1);
310 execute.add(INVOKESPECIAL,new MethodRef("org.ibex.nestedvm.Runtime$FaultException","<init>",Type.VOID,new Type[]{new Type.Object("java.lang.RuntimeException")}));
313 execute.addExceptionHandler(tryStart,tryEnd,catchInsn,new Type.Object("java.lang.RuntimeException"));
314 execute.addThrow(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
316 MethodGen main = cg.addMethod("main",Type.VOID,new Type[]{Type.arrayType(Type.STRING)},ACC_STATIC|ACC_PUBLIC);
319 main.add(INVOKESPECIAL,new MethodRef(me,"<init>",Type.VOID,Type.NO_ARGS));
320 main.add(LDC,fullClassName);
323 Type.Object ur = new Type.Object("org.ibex.nestedvm.UnixRuntime");
324 main.add(INVOKESTATIC,new MethodRef(ur,"runAndExec",Type.INT,new Type[]{ur,Type.STRING,Type.arrayType(Type.STRING)}));
326 main.add(INVOKEVIRTUAL,new MethodRef(me,"run",Type.INT,new Type[]{Type.STRING,Type.arrayType(Type.STRING)}));
328 main.add(INVOKESTATIC,new MethodRef(new Type.Object("java.lang.System"),"exit",Type.VOID,new Type[]{Type.INT}));
334 private void addConstReturnMethod(String name, int val) {
335 MethodGen m = cg.addMethod(name,Type.INT,Type.NO_ARGS,ACC_PROTECTED);
340 private static int initDataCount;
341 private void emitData(int addr, DataInputStream dis, int size, boolean readOnly) throws Exn,IOException {
342 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Data section on weird boundaries");
343 int last = addr + size;
345 int segSize = Math.min(size,28000); // must be a multiple of 56
346 StringBuffer sb = new StringBuffer();
347 for(int i=0;i<segSize;i+=7) {
349 for(int j=0;j<7;j++) {
351 byte b = (i+j < size) ? dis.readByte() : 1;
355 sb.append((char) ((l>>>(7*(7-j)))&0x7f));
357 String fieldname = "_data" + (++initDataCount);
358 cg.addField(fieldname,Type.arrayType(Type.INT),ACC_PRIVATE|ACC_STATIC|ACC_FINAL);
360 clinit.add(LDC,sb.toString());
361 clinit.add(LDC,segSize/4);
362 clinit.add(INVOKESTATIC,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime"),"decodeData",Type.arrayType(Type.INT),new Type[]{Type.STRING,Type.INT}));
363 clinit.add(PUTSTATIC,new FieldRef(me,fieldname,Type.arrayType(Type.INT)));
366 init.add(GETSTATIC,new FieldRef(me,fieldname,Type.arrayType(Type.INT)));
368 init.add(LDC,readOnly ? 1 : 0);
369 init.add(INVOKEVIRTUAL,new MethodRef(me,"initPages",Type.VOID,new Type[]{Type.arrayType(Type.INT),Type.INT,Type.BOOLEAN}));
377 private void emitBSS(int addr, int size) throws Exn {
378 if((addr&3)!=0) throw new Exn("BSS section on weird boundaries");
385 init.add(INVOKEVIRTUAL,new MethodRef(me,"clearPages",Type.VOID,new Type[]{Type.INT,Type.INT}));
389 private boolean textDone; // a text segment was already processed
390 private int startOfMethod = 0; // the start of this method (not necessarily the first instruction)
391 private int endOfMethod = 0; // the maximum end of this method (could end before it is full)
392 private boolean unreachable = false; // is the current pc is reachable
394 private MethodGen.PhantomTarget returnTarget; // where to jump when exiting the method
395 private MethodGen.PhantomTarget defaultTarget; // the default switch target (throws exn)
396 private MethodGen.PhantomTarget[] insnTargets; // the targets for each jumpable instruction
397 private MethodGen mg; // the method itself
399 private boolean jumpable(int addr) { return jumpableAddresses.get(new Integer(addr)) != null; }
401 private void emitText(int addr, DataInputStream dis, int size) throws Exn,IOException {
402 if(textDone) throw new Exn("Multiple text segments");
405 if((addr&3)!=0 || (size&3)!=0) throw new Exn("Section on weird boundaries");
407 int insn,nextInsn=-1;
408 boolean skipNext = true;
410 for(int i=0;i<count;i++,addr+=4) {
411 insn = skipNext ? dis.readInt() : nextInsn;
412 nextInsn = (i == count-1) ? -1 : dis.readInt();
413 if(addr >= endOfMethod) { endMethod(addr); startMethod(addr); }
414 if(insnTargets[(addr-startOfMethod)/4] != null) {
415 insnTargets[(addr-startOfMethod)/4].setTarget(mg.size());
417 } else if(unreachable) {
421 skipNext = emitInstruction(addr,insn,nextInsn);
422 } catch(RuntimeException e) {
423 warn.println("Exception at " + toHex(addr));
426 if(skipNext) { addr+=4; i++; }
433 private void startMethod(int first) {
434 startOfMethod = first & methodMask;
435 endOfMethod = startOfMethod + maxBytesPerMethod;
437 mg = cg.addMethod("run_" + toHex(startOfMethod),Type.VOID,Type.NO_ARGS,ACC_PRIVATE|ACC_FINAL);
440 mg.add(GETFIELD,new FieldRef(me,"page",Type.arrayType(Type.INT)));
444 mg.add(GETFIELD,new FieldRef(me,"readPages",Type.arrayType(Type.INT,2)));
447 mg.add(GETFIELD,new FieldRef(me,"writePages",Type.arrayType(Type.INT,2)));
451 returnTarget = new MethodGen.PhantomTarget();
452 insnTargets = new MethodGen.PhantomTarget[maxBytesPerMethod/4];
454 int[] buf = new int[maxBytesPerMethod/4];
455 Object[] targetBuf = new Object[maxBytesPerMethod/4];
457 for(int addr=first;addr<endOfMethod;addr+=4) {
459 targetBuf[n] = insnTargets[(addr-startOfMethod)/4] = new MethodGen.PhantomTarget();
465 MethodGen.LSI lsi = new MethodGen.LSI(n);
466 System.arraycopy(buf,0,lsi.vals,0,n);
467 System.arraycopy(targetBuf,0,lsi.targets,0,n);
468 lsi.setDefaultTarget(defaultTarget = new MethodGen.PhantomTarget());
473 mg.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
474 mg.add(LOOKUPSWITCH,lsi);
477 private void endMethod(int firstAddrOfNext) {
478 if(startOfMethod == 0) return;
482 mg.add(LDC,firstAddrOfNext);
484 // mark the start of the next method as jumpable
485 jumpableAddresses.put(new Integer(firstAddrOfNext),Boolean.TRUE);
488 returnTarget.setTarget(mg.size());
494 defaultTarget.setTarget(mg.size());
497 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
499 mg.add(NEW,Type.STRINGBUFFER);
501 mg.add(LDC,"Jumped to invalid address: ");
502 mg.add(INVOKESPECIAL,new MethodRef(Type.STRINGBUFFER,"<init>",Type.VOID,new Type[]{Type.STRING}));
504 mg.add(GETFIELD,new FieldRef(me,"pc",Type.INT));
505 mg.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"append",Type.STRINGBUFFER,new Type[]{Type.INT}));
506 mg.add(INVOKEVIRTUAL,new MethodRef(Type.STRINGBUFFER,"toString",Type.STRING,Type.NO_ARGS));
507 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
510 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
512 mg.add(LDC,"Jumped to invalid address");
513 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
517 endOfMethod = startOfMethod = 0;
521 private void leaveMethod() {
522 mg.add(GOTO,returnTarget);
525 private void branch(int pc, int target) {
526 if((pc&methodMask) == (target&methodMask)) {
527 mg.add(GOTO,insnTargets[(target-startOfMethod)/4]);
536 // This assumes everything needed by ifInsn is already on the stack
537 private boolean doIfInstruction(byte op, int pc, int target, int nextInsn) throws Exn {
538 emitInstruction(-1,nextInsn,-1); // delay slot
539 if((target&methodMask) == (pc&methodMask)) {
540 mg.add(op,insnTargets[(target-startOfMethod)/4]);
542 int h = mg.add(MethodGen.negate(op));
544 mg.setArg(h,mg.size());
546 if(!jumpable(pc+4)) return true; // done - skip it
548 //System.err.println("Delay slot is jumpable - This code is untested + " + toHex(nextInsn));
549 if(pc+4==endOfMethod) {
550 // the delay slot is at the start of the next method
551 jumpableAddresses.put(new Integer(pc+8),Boolean.TRUE); // make the 2nd insn of the next method jumpable
552 branch(pc,pc+8); // jump over it
553 //System.err.println("delay slot: " + toHex(pc+8)); */
555 return false; // we still need to output it
557 //System.err.println("jumped over delay slot: " + toHex(pc+4));
558 // add another copy and jump over
560 int b = mg.add(GOTO);
561 emitInstruction(-1,nextInsn,01); // delay slot
562 mg.setArg(b,mg.size());
568 private static final Float POINT_5_F = new Float(0.5f);
569 private static final Double POINT_5_D = new Double(0.5f);
570 private static final Long FFFFFFFF = new Long(0xffffffffL);
572 private boolean emitInstruction(int pc, int insn, int nextInsn) throws Exn {
573 MethodGen mg = this.mg; // smaller bytecode
574 if(insn == -1) throw new Exn("insn is -1");
576 int op = (insn >>> 26) & 0xff; // bits 26-31
577 int rs = (insn >>> 21) & 0x1f; // bits 21-25
578 int rt = (insn >>> 16) & 0x1f; // bits 16-20
579 int ft = (insn >>> 16) & 0x1f;
580 int rd = (insn >>> 11) & 0x1f; // bits 11-15
581 int fs = (insn >>> 11) & 0x1f;
582 int shamt = (insn >>> 6) & 0x1f; // bits 6-10
583 int fd = (insn >>> 6) & 0x1f;
584 int subcode = insn & 0x3f; // bits 0-5
585 int breakCode = (insn >>> 6) & 0xfffff; // bits 6-20
587 int jumpTarget = (insn & 0x03ffffff); // bits 0-25
588 int unsignedImmediate = insn & 0xffff;
589 int signedImmediate = (insn << 16) >> 16;
590 int branchTarget = signedImmediate;
642 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
643 emitInstruction(-1,nextInsn,-1);
651 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
652 emitInstruction(-1,nextInsn,-1);
668 // FEATURE: This is actually broken, but it happens to work for our code
669 // a func could theoretically jump back to here from a future point
670 restoreChangedRegs();
681 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}));
685 mg.add(GETFIELD,new FieldRef(me,"state",Type.INT));
691 mg.setArg(b1,mg.size());
694 mg.add(NEW,new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"));
696 mg.add(LDC,"BREAK Code " + toHex(breakCode));
697 mg.add(INVOKESPECIAL,new MethodRef(new Type.Object("org.ibex.nestedvm.Runtime$ExecutionException"),"<init>",Type.VOID,new Type[]{Type.STRING}));
731 mg.add(SWAP); //a(InstructionConstants.SWAP);
738 mg.add(SWAP); //a(InstructionConstants.SWAP);
745 mg.add(LDC,FFFFFFFF);
749 mg.add(LDC,FFFFFFFF);
791 mg.add(LDC,FFFFFFFF);
796 mg.add(LDC,FFFFFFFF);
813 mg.setArg(b1,mg.size());
818 throw new Exn("ADD (add with oveflow trap) not suported");
821 if(rt != 0 && rs != 0) {
833 throw new Exn("SUB (add with oveflow trap) not suported");
836 if(rt != 0 && rs != 0) {
871 if(rs != 0 || rt != 0) {
872 if(rs != 0 && rt != 0) {
893 b1 = mg.add(IF_ICMPLT);
896 mg.setArg(b1,mg.add(ICONST_1));
897 mg.setArg(b2,mg.size());
909 mg.add(LDC,FFFFFFFF);
913 mg.add(LDC,FFFFFFFF);
923 mg.setArg(b1,mg.add(ICONST_1));
924 mg.setArg(b2,mg.size());
931 throw new Exn("Illegal instruction 0/" + subcode);
938 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
940 return doIfInstruction(IFLT,pc,pc+branchTarget*4+4,nextInsn);
942 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
944 return doIfInstruction(IFGE,pc,pc+branchTarget*4+4,nextInsn);
946 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
949 emitInstruction(-1,nextInsn,-1);
953 branch(pc,pc+branchTarget*4+4);
954 mg.setArg(b1,mg.size());
957 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
959 if(rs != 0) { // r0 is always >= 0
963 emitInstruction(-1,nextInsn,-1);
967 branch(pc,pc+branchTarget*4+4);
968 if(b1 != -1) mg.setArg(b1,mg.size());
969 if(b1 == -1) unreachable = true;
972 throw new Exn("Illegal Instruction 1/" + rt);
977 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
978 emitInstruction(-1,nextInsn,-1);
979 branch(pc,(pc&0xf0000000)|(jumpTarget << 2));
984 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
985 int target = (pc&0xf0000000)|(jumpTarget << 2);
986 emitInstruction(-1,nextInsn,-1);
995 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
997 emitInstruction(-1,nextInsn,-1);
998 branch(pc,pc+branchTarget*4+4);
1000 } else if(rs == 0 || rt == 0) {
1001 pushReg(rt == 0 ? R+rs : R+rt);
1002 return doIfInstruction(IFEQ,pc,pc+branchTarget*4+4,nextInsn);
1006 return doIfInstruction(IF_ICMPEQ,pc,pc+branchTarget*4+4,nextInsn);
1010 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1013 return doIfInstruction(IFNE,pc,pc+branchTarget*4+4,nextInsn);
1016 return doIfInstruction(IF_ICMPNE,pc,pc+branchTarget*4+4,nextInsn);
1019 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1021 return doIfInstruction(IFLE,pc,pc+branchTarget*4+4,nextInsn);
1023 if(pc == -1) throw new Exn("pc modifying insn in delay slot");
1025 return doIfInstruction(IFGT,pc,pc+branchTarget*4+4,nextInsn);
1027 throw new Exn("ADDI (add immediate with oveflow trap) not suported");
1030 addiu(rs,signedImmediate);
1036 mg.add(LDC,signedImmediate);
1037 b1 = mg.add(IF_ICMPLT);
1040 mg.setArg(b1,mg.add(ICONST_1));
1041 mg.setArg(b2,mg.size());
1048 mg.add(LDC,FFFFFFFF);
1050 // Yes, this is correct, you have to sign extend the immediate then do an UNSIGNED comparison
1051 mg.add(LDC,new Long(signedImmediate&0xffffffffL));
1057 mg.setArg(b1,mg.add(ICONST_1));
1058 mg.setArg(b2,mg.size());
1064 mg.add(LDC,unsignedImmediate);
1070 if(rs != 0 && unsignedImmediate != 0) {
1072 mg.add(LDC,unsignedImmediate);
1077 mg.add(LDC,unsignedImmediate);
1084 mg.add(LDC,unsignedImmediate);
1090 mg.add(LDC,unsignedImmediate << 16);
1094 throw new Exn("TLB/Exception support not implemented");
1103 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
1117 if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
1122 case 8: {// BC1F, BC1T
1124 mg.add(LDC,0x800000);
1126 return doIfInstruction(((insn>>>16)&1) == 0 ? IFEQ : IFNE,pc,pc+branchTarget*4+4,nextInsn);
1130 { // Single/Double math
1131 boolean d = rs == 17;
1134 preSetDouble(F+fd,d);
1137 mg.add(d ? DADD : FADD);
1141 preSetDouble(F+fd,d);
1144 mg.add(d ? DSUB : FSUB);
1148 preSetDouble(F+fd,d);
1151 mg.add(d ? DMUL : FMUL);
1155 preSetDouble(F+fd,d);
1158 mg.add(d ? DDIV : FDIV);
1162 preSetDouble(F+fd,d);
1163 // NOTE: We can't use fneg/dneg here since they'll turn +0.0 into -0.0
1166 mg.add(d ? DUP2 : DUP);
1167 mg.add(d ? DCONST_0 : FCONST_0);
1168 mg.add(d ? DCMPG : FCMPG);
1171 mg.add(d ? DCONST_0 : FCONST_0);
1178 mg.add(d ? DSUB : FSUB);
1180 mg.setArg(b1,mg.size());
1197 preSetDouble(F+fd,d);
1199 mg.add(d ? DNEG : FNEG);
1214 case 36: { // CVT.W.D
1215 MethodGen.TSI tsi = new MethodGen.TSI(0,3);
1221 mg.add(TABLESWITCH,tsi);
1223 // Round towards plus infinity
1224 tsi.setTarget(2,mg.size());
1225 if(!d) mg.add(F2D); // Ugh.. java.lang.Math doesn't have a float ceil/floor
1226 mg.add(INVOKESTATIC,new MethodRef("java.lang.Math","ceil",Type.DOUBLE,new Type[]{Type.DOUBLE}));
1231 tsi.setTarget(0,mg.size());
1232 mg.add(LDC,d ? (Object)POINT_5_D : (Object)POINT_5_F);
1233 mg.add(d ? DADD : FADD);
1236 // Round towards minus infinity
1237 tsi.setTarget(3,mg.size());
1239 mg.add(INVOKESTATIC,new MethodRef("java.lang.Math","floor",Type.DOUBLE,new Type[]{Type.DOUBLE}));
1242 tsi.setTarget(1,mg.size());
1243 tsi.setDefaultTarget(mg.size());
1244 mg.setArg(b1,mg.size());
1246 mg.add(d ? D2I : F2I);
1256 mg.add(LDC,~0x800000);
1260 mg.add(d ? DCMPG : FCMPG);
1262 case 50: b1 = mg.add(IFNE); break;
1263 case 60: b1 = mg.add(IFGE); break;
1264 case 62: b1 = mg.add(IFGT); break;
1267 mg.add(LDC,0x800000);
1269 mg.setArg(b1,mg.size());
1272 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
1276 case 20: { // Integer
1290 default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
1295 throw new Exn("Invalid Instruction 17/" + rs);
1300 throw new Exn("coprocessor 2 and 3 instructions not available");
1303 addiu(R+rs,signedImmediate);
1323 addiu(R+rs,signedImmediate);
1343 addiu(R+rs,signedImmediate);
1347 mg.add(LDC,0x00ffffff);
1378 memRead(R+rs,signedImmediate);
1383 addiu(R+rs,signedImmediate);
1404 addiu(R+rs,signedImmediate);
1419 // chars are unsigend so this works
1426 addiu(R+rs,signedImmediate);
1430 mg.add(LDC,0xffffff00);
1459 addiu(R+rs,signedImmediate);
1462 // FEATURE: DO the preMemRead(true) thing for the rest of the S* instructions
1467 mg.add(LDC,0xff000000);
1504 addiu(R+rs,signedImmediate);
1550 addiu(R+rs,signedImmediate);
1560 mg.add(LDC,0xffffff00);
1588 preMemWrite2(R+rs,signedImmediate);
1595 addiu(R+rs,signedImmediate);
1605 mg.add(LDC,0x00ffffff);
1630 // This need to be atomic if we ever support threads (see SWC0/SC)
1633 memRead(R+rs,signedImmediate);
1639 memRead(R+rs,signedImmediate);
1643 /* This needs to fail (set rt to 0) if the memory location was modified
1644 * between the LL and SC if we ever support threads.
1649 preMemWrite2(R+rs,signedImmediate);
1658 preMemWrite2(R+rs,signedImmediate);
1663 throw new Exn("Invalid Instruction: " + op + " at " + toHex(pc));
1668 // Helper functions for emitText
1670 private static final int R = 0;
1671 private static final int F = 32;
1672 private static final int HI = 64;
1673 private static final int LO = 65;
1674 private static final int FCSR = 66;
1675 private static final int REG_COUNT=67;
1677 private int[] regLocalMapping = new int[REG_COUNT];
1678 private int[] regLocalReadCount = new int[REG_COUNT];
1679 private int[] regLocalWriteCount = new int[REG_COUNT];
1680 private int nextAvailLocal;
1681 private int loadsStart;
1682 private static final int MAX_LOCALS = 4;
1683 private static final int LOAD_LENGTH = 3;
1685 private boolean doLocal(int reg) {
1686 return reg == R+2 || reg == R+3 || reg == R+4 || reg == R+29;
1689 private int getLocalForReg(int reg) {
1690 if(regLocalMapping[reg] != 0) return regLocalMapping[reg];
1691 if(nextAvailLocal == 0) nextAvailLocal = onePage ? 3 : 4;
1692 regLocalMapping[reg] = nextAvailLocal++;
1693 return regLocalMapping[reg];
1696 private void fixupRegsStart() {
1697 for(int i=0;i<REG_COUNT;i++)
1698 regLocalMapping[i] = regLocalReadCount[i] = regLocalWriteCount[i] = 0;
1700 loadsStart = mg.size();
1701 for(int i=0;i<MAX_LOCALS*LOAD_LENGTH;i++)
1705 private void fixupRegsEnd() {
1707 for(int i=0;i<REG_COUNT;i++) {
1708 if(regLocalMapping[i] == 0) continue;
1709 mg.set(p++,ALOAD_0);
1710 mg.set(p++,GETFIELD,new FieldRef(me,regField(i),Type.INT));
1711 mg.set(p++,ISTORE,regLocalMapping[i]);
1713 if(regLocalWriteCount[i] > 0) {
1715 mg.add(ILOAD,regLocalMapping[i]);
1716 mg.add(PUTFIELD,new FieldRef(me,regField(i),Type.INT));
1721 private void restoreChangedRegs() {
1722 for(int i=0;i<REG_COUNT;i++) {
1723 if(regLocalWriteCount[i] > 0) {
1725 mg.add(ILOAD,regLocalMapping[i]);
1726 mg.add(PUTFIELD,new FieldRef(me,regField(i),Type.INT));
1731 private static final String[] regField = {
1732 "r0","r1","r2","r3","r4","r5","r6","r7",
1733 "r8","r9","r10","r11","r12","r13","r14","r15",
1734 "r16","r17","r18","r19","r20","r21","r22","r23",
1735 "r24","r25","r26","r27","r28","r29","r30","r31",
1737 "f0","f1","f2","f3","f4","f5","f6","f7",
1738 "f8","f9","f10","f11","f12","f13","f14","f15",
1739 "f16","f17","f18","f19","f20","f21","f22","f23",
1740 "f24","f25","f26","f27","f28","f29","f30","f31",
1745 private static String regField(int reg) { return regField[reg]; }
1747 private int pushRegWZ(int reg) {
1749 warn.println("Warning: Pushing r0!");
1750 new Exception().printStackTrace(warn);
1752 return pushRegZ(reg);
1755 private int pushRegZ(int reg) {
1756 if(reg == R+0) return mg.add(ICONST_0);
1757 else return pushReg(reg);
1761 private int pushReg(int reg) {
1764 regLocalReadCount[reg]++;
1765 mg.add(ILOAD,getLocalForReg(reg));
1769 mg.add(GETFIELD,new FieldRef(me,regField(reg),Type.INT));
1774 private int preSetRegStackPos;
1775 private int[] preSetRegStack = new int[8];
1777 // This can push ONE or ZERO words to the stack. If it pushed one it returns true
1778 private boolean preSetReg(int reg) {
1779 regField(reg); // just to check for validity
1780 preSetRegStack[preSetRegStackPos] = reg;
1781 preSetRegStackPos++;
1790 private int setReg() {
1791 if(preSetRegStackPos==0) throw new RuntimeException("didn't do preSetReg");
1792 preSetRegStackPos--;
1793 int reg = preSetRegStack[preSetRegStackPos];
1796 mg.add(ISTORE,getLocalForReg(reg));
1797 regLocalWriteCount[reg]++;
1799 mg.add(PUTFIELD,new FieldRef(me,regField(reg),Type.INT));
1804 private int preSetPC() { return mg.add(ALOAD_0); }
1805 private int setPC() {
1806 return mg.add(PUTFIELD,new FieldRef(me,"pc",Type.INT));
1809 //unused - private InstructionHandle pushFloat(int reg) throws CompilationException { return pushDouble(reg,false); }
1810 //unused - private InstructionHandle pushDouble(int reg) throws CompilationException { return pushDouble(reg,true); }
1811 private int pushDouble(int reg, boolean d) throws Exn {
1812 if(reg < F || reg >= F+32) throw new IllegalArgumentException(""+reg);
1815 if(reg == F+31) throw new Exn("Tried to use a double in f31");
1822 mg.add(LDC,FFFFFFFF);
1825 mg.add(INVOKESTATIC,new MethodRef(Type.DOUBLE_OBJECT,"longBitsToDouble",Type.DOUBLE,new Type[]{Type.LONG}));
1828 mg.add(INVOKESTATIC,new MethodRef("java.lang.Float","intToFloatBits",Type.FLOAT,new Type[]{Type.INT}));
1833 private void preSetFloat(int reg) { preSetDouble(reg,false); }
1834 private void preSetDouble(int reg) { preSetDouble(reg,true); }
1835 private void preSetDouble(int reg, boolean d) { preSetReg(reg); }
1837 private int setFloat() throws Exn { return setDouble(false); }
1838 private int setDouble() throws Exn { return setDouble(true); }
1839 private int setDouble(boolean d) throws Exn {
1840 int reg = preSetRegStack[preSetRegStackPos-1];
1841 if(reg < F || reg >= F+32) throw new IllegalArgumentException(""+reg);
1844 if(reg == F+31) throw new Exn("Tried to use a double in f31");
1845 mg.add(INVOKESTATIC,new MethodRef(Type.DOUBLE_OBJECT,"doubleToLongBits",Type.LONG,new Type[]{Type.DOUBLE}));
1850 if(preSetReg(reg+1))
1854 setReg(); // preSetReg was already done for this by preSetDouble
1856 //h = a(fac.createInvoke("java.lang.Float","floatToRawIntBits",Type.INT,new Type[]{Type.FLOAT},INVOKESTATIC));
1857 mg.add(INVOKESTATIC,new MethodRef(Type.FLOAT_OBJECT,"floatToRawIntBits",Type.INT,new Type[]{Type.FLOAT}));
1863 private void pushTmp() { mg.add(ILOAD_1); }
1864 private void setTmp() { mg.add(ISTORE_1); }
1866 private void addiu(int reg, int offset) {
1867 if(reg != R+0 && offset != 0) {
1871 } else if(reg != R+0) {
1877 private int memWriteStage;
1878 private void preMemWrite1() {
1879 if(memWriteStage!=0) throw new Error("pending preMemWrite1/2");
1889 private void preMemWrite2(int reg, int offset) {
1894 private void preMemWrite2() { preMemWrite2(false); }
1895 private void preMemWrite2(boolean addrInTmp) {
1896 if(memWriteStage!=1) throw new Error("pending preMemWrite2 or no preMemWrite1");
1899 if(nullPointerCheck) {
1903 mg.add(INVOKEVIRTUAL,new MethodRef(me,"nullPointerCheck",Type.VOID,new Type[]{Type.INT}));
1909 } else if(fastMem) {
1912 mg.add(LDC,pageShift);
1921 mg.add(LDC,(pageSize>>2)-1);
1926 // pops an address and value off the stack, sets *addr to value
1927 private void memWrite() {
1928 if(memWriteStage!=2) throw new Error("didn't do preMemWrite1 or preMemWrite2");
1933 } else if(fastMem) {
1936 mg.add(INVOKEVIRTUAL,new MethodRef(me,"unsafeMemWrite",Type.VOID,new Type[]{Type.INT,Type.INT}));
1941 // reads the word at r[reg]+offset
1942 private void memRead(int reg, int offset) {
1948 private boolean didPreMemRead;
1949 private boolean preMemReadDoPreWrite;
1951 private void preMemRead() { preMemRead(false); }
1952 private void preMemRead(boolean preWrite) {
1953 if(didPreMemRead) throw new Error("pending preMemRead");
1954 didPreMemRead = true;
1955 preMemReadDoPreWrite = preWrite;
1959 mg.add(ALOAD,preWrite ? 3 : 2);
1963 // memRead pops an address off the stack, reads the value at that addr, and pushed the value
1964 // preMemRead MUST be called BEFORE the addresses is pushed
1965 private void memRead() { memRead(false); }
1967 private void memRead(boolean addrInTmp) {
1968 if(!didPreMemRead) throw new Error("didn't do preMemRead");
1969 didPreMemRead = false;
1970 if(preMemReadDoPreWrite)
1973 if(nullPointerCheck) {
1977 mg.add(INVOKEVIRTUAL,new MethodRef(me,"nullPointerCheck",Type.VOID,new Type[]{Type.INT}));
1983 if(preMemReadDoPreWrite)
1986 } else if(fastMem) {
1989 mg.add(LDC,pageShift);
1998 mg.add(LDC,(pageSize>>2)-1);
2000 if(preMemReadDoPreWrite)
2005 if(preMemReadDoPreWrite)
2007 mg.add(INVOKEVIRTUAL,new MethodRef(me,"unsafeMemRead",Type.INT,new Type[]{Type.INT}));
2012 // This might come in handy for something else
2013 /*private boolean touchesReg(int insn, int reg) {
2014 if((reg < R+0 || reg >= R+32) && reg != FCSR) throw new IllegalArgumentException(""+reg);
2015 if(reg == R+0) return false; // r0 is never modified
2016 int op = (insn >>> 26) & 0xff; // bits 26-31
2017 int subcode = insn & 0x3f; // bits 0-5
2018 int rd = (insn >>> 11) & 0x1f; // bits 11-15
2019 int rt = (insn >>> 16) & 0x1f; // bits 16-20
2020 int rs = (insn >>> 21) & 0x1f; // bits 21-25
2024 if(subcode >= 0 && subcode <= 7) return reg == R+rd; // Shift ops
2025 if(subcode >= 32 && subcode <= 43) return reg == R+rd; // Other math ops
2026 if(subcode >= 24 && subcode <= 27) return reg == HI || reg == LO; // MULT/DIV
2028 case 13: return false; // BREAK
2031 case 0: return reg == R+rt; // MFC.1
2032 case 2: return reg == R+rt; // CFC.1
2033 case 4: return false; // MTC.1
2034 case 6: return false; // CTC.1
2037 if(subcode == 50 || subcode == 60 || subcode == 62) return reg == FCSR;
2038 return false; // everything else just touches f0-f31
2039 case 20: return false; // Integer - just touches f0-f31
2043 if(op >= 8 && op <= 15) return reg == R+rt; // XXXI instructions
2044 if(op >= 40 && op <= 46) return false; // Memory WRITE ops
2045 if(op == 49) return reg == F+rt; // LWC1
2046 if(op == 57) return false; // SWC1
2049 warn.println("Unknown instruction in touchesReg()- assuming it modifies all regs " + op + " " + subcode);
2050 new Exception().fillInStackTrace().printStackTrace(warn);