+++ /dev/null
-package org.xwt.mips;
-
-import java.util.*;
-import java.io.*;
-import org.xwt.mips.util.SeekableData;
-
-public class JavaSourceCompiler extends Compiler {
- /** Stores the "case r XXX: ... run_YYYY();" blocks generated by the emitText method/ */
- private StringBuffer runs = new StringBuffer();
- /** Stores the "initData" and "cleadData" calls generated by the emitData and emitBSS methods */
- private StringBuffer inits = new StringBuffer();
- /** Stores lines to go in the class scope */
- private StringBuffer classLevel = new StringBuffer();
-
- /** The stream to write the compiled output to */
- private PrintWriter out;
-
- /** Prints a blank line to the output stream */
- private void p() { out.println(); }
- /** prints the given string (indented by <i>indent</i>*4 spaces) to the output stream */
- private void p(String s) { out.println(indents[indent] + s); }
- private void pblock(StringBuffer sb) { out.print(sb.toString()); }
-
- /** Used by the p() method to add indentation */
- private int indent;
-
- private static String indents[] = new String[16];
- static { String s=""; for(int i=0;i<indents.length;i++,s=s+" ") indents[i] = s; }
-
- public JavaSourceCompiler(SeekableData binary, String className, Writer w) throws IOException {
- super(binary,className);
- out = new PrintWriter(w);
- }
-
- protected void _go() throws Exn, IOException {
- String packageName;
- String className;
- if (fullClassName.indexOf('.') != -1) {
- packageName = fullClassName.substring(0, fullClassName.lastIndexOf('.'));
- className = fullClassName.substring(fullClassName.lastIndexOf('.') + 1);
- } else {
- className = fullClassName;
- packageName = null;
- }
-
- p("/* This file was generated from " + source + " by Mips2Java on " + dateTime() + " */");
- if (packageName != null) p("package " + packageName + ";");
- if(runtimeStats) p("import java.util.*;");
- p();
- p("public class " + className + " extends " + runtimeClass + " {");
- indent++;
-
- p("/* program counter */");
- p("private int pc = 0;");
- if(debugCompiler)
- p("private int lastPC = 0;");
- p();
- p("/* General Purpose registers */");
- p("private final static int r0 = 0;");
- p("private int r1, r2, r3, r4, r5, r6, r7,");
- p(" r8, r9, r10, r11, r12, r13, r14, r15,");
- p(" r16, r17, r18, r19, r20, r21, r22, r23,");
- p(" r24, r25, r26, r27, r28, r29, r30, r31,");
- p(" hi = 0, lo = 0;");
- p("/* FP registers */");
- p("private int f0, f1, f2, f3, f4, f5, f6, f7,");
- p(" f8, f9, f10, f11, f12, f13, f14, f15,");
- p(" f16, f17, f18, f19, f20, f21, f22, f23,");
- p(" f24, f25, f26, f27, f28, f29, f30, f31;");
- p("/* FP Control Register */");
- p("private int fcsr = 0;");
- p();
-
- if(onePage) p("private final int[] page = readPages[0];");
-
- // Generate main body functions (run_XXXX() blocks, _data[] arrays, etc)
- int highestAddr = 0;
-
- for(int i=0;i<elf.sheaders.length;i++) {
- ELF.SHeader sheader = elf.sheaders[i];
- String name = sheader.name;
- // if this section doesn't get loaded into our address space don't worry about it
- if(sheader.addr == 0x0) continue;
-
- highestAddr = Math.max(highestAddr, sheader.addr + sheader.size);
-
- if(name.equals(".text"))
- emitText(sheader.addr, new DataInputStream(sheader.getInputStream()),sheader.size);
- else if(name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"))
- emitData(sheader.addr, new DataInputStream(sheader.getInputStream()), sheader.size,name.equals(".rodata"));
- else if(name.equals(".bss") || name.equals(".sbss"))
- emitBSS(sheader.addr,sheader.size);
- else
- throw new Exn("Unknown segment: " + name);
- }
- p();
-
- pblock(classLevel);
- p();
-
- // Trampoline (dispatch calls to the appropriate run_XXX() methods
- p("private final void trampoline() throws ExecutionException {");
- indent++;
- p("while(state == RUNNING) {");
- indent++;
- p("switch(pc>>>" + methodShift+ ") {");
- //p("switch(pc&" + toHex(methodMask) + ") {");
- indent++;
- pblock(runs);
- p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(this.pc&0xffffffffL,16) + \": r2: \" + r2);");
- indent--; p("}");
- indent--; p("}");
- indent--; p("}");
- p();
-
- // Constructor
- p("public " + className + "() {");
- indent++;
- p("super(" + pageSize + "," + totalPages + "," + (fastMem?"false":"true") + ");");
- p("entryPoint = " + toHex(elf.header.entry) + ";");
- if(userInfo != null) {
- p("userInfoBase=" + toHex(userInfo.addr) + ";");
- p("userInfoSize=" + userInfo.size + ";");
- }
- p("gp = " + toHex(gp.addr) + ";");
- if(onePage)
- p("brkAddr = " + toHex((highestAddr+4095)&~4095) + ";");
- else
- p("brkAddr = " + toHex((highestAddr+pageSize-1)&~(pageSize-1)) + ";");
- pblock(inits);
- p("state = INITIALIZED;");
- indent--;
- p("}");
- p();
-
- // main() function
- p("public static void main(String[] args) throws Exception {");
- indent++;
- p("" + className + " me = new " + className + "();");
- p("int status = me.run(\"" + fullClassName + "\",args);");
- if(runtimeStats) p("me.printStats();");
- p("System.exit(status);");
- indent--;
- p("}");
- p();
-
- // Runtime abstract methods
- p("protected void _execute() throws ExecutionException { trampoline(); }");
- p();
-
- p("protected void setCPUState(CPUState state) {");
- indent++;
- for(int i=1;i<32;i++) p("r" + i + "=state.r[" + i + "];");
- for(int i=0;i<32;i++) p("f" + i + "=state.f[" + i + "];");
- p("hi=state.hi; lo=state.lo; fcsr=state.fcsr;");
- p("pc=state.pc;");
- indent--;
- p("}");
- p("protected CPUState getCPUState() {");
- indent++;
- p("CPUState state = new CPUState();");
- for(int i=1;i<32;i++) p("state.r[" + i + "]=r" + i+ ";");
- for(int i=0;i<32;i++) p("state.f[" + i + "]=f" + i +";");
- p("state.hi=hi; state.lo=lo; state.fcsr=fcsr;");
- p("state.pc=pc;");
- p("return state;");
- indent--;
- p("}");
- p();
-
- if(supportCall) {
- p("private static final " + hashClass + " symbols = new " + hashClass + "();");
- p("static {");
- indent++;
- ELF.Symbol[] symbols = elf.getSymtab().symbols;
- for(int i=0;i<symbols.length;i++) {
- ELF.Symbol s = symbols[i];
- if(s.type == ELF.Symbol.STT_FUNC && s.binding == ELF.Symbol.STB_GLOBAL && (s.name.equals("_call_helper") || !s.name.startsWith("_")))
- p("symbols.put(\"" + s.name + "\",new Integer(" + toHex(s.addr) + "));");
- }
- indent--;
- p("}");
- p("public int lookupSymbol(String symbol) { Integer i = (Integer) symbols.get(symbol); return i==null ? -1 : i.intValue(); }");
- p();
- }
-
- // Runtime stats
- if(runtimeStats) {
- p("private HashMap counters = new HashMap();");
- p("private void inc(String k) { Long i = (Long)counters.get(k); counters.put(k,new Long(i==null ? 1 : i.longValue() + 1)); }");
- p("private void printStats() {");
- p(" Iterator i = new TreeSet(counters.keySet()).iterator();");
- p(" while(i.hasNext()) { Object o = i.next(); System.err.println(\"\" + o + \": \" + counters.get(o)); }");
- p("}");
- p();
- }
-
- indent--;
- p("}");
- }
-
- private int startOfMethod = 0;
- private int endOfMethod = 0;
-
- private void startMethod(int addr) {
- addr &= ~(maxBytesPerMethod-1);
- startOfMethod = addr;
- endOfMethod = addr + maxBytesPerMethod;
- String methodName = "run_" + Long.toString(addr & 0xffffffffL, 16);
- runs.append(indents[4] + "case " + toHex(addr>>>methodShift) + ": " + methodName + "(); break; \n");
- //runs.append(indents[4] + "case " + toHex(addr&methodMask) + ": " + methodName + "(); break; \n");
-
- p("private final void " + methodName + "() throws ExecutionException { /"+"* " + toHex(addr) + " - " + toHex(endOfMethod) + " *" + "/");
- indent++;
- p("int addr, tmp;");
- p("for(;;) {");
- indent++;
- p("switch(pc) {");
- indent++;
- }
-
- private void endMethod() { endMethod(endOfMethod); }
- private void endMethod(int lastAddr) {
- if(startOfMethod == 0) return;
- // FEATURE: We should be able to use if(!unreachable) here (i think)
- // This isn't strictly necessary; its just here to work around unreachable code errors
- p("case " + toHex(lastAddr) + ":");
- indent++;
- p("pc=" + constant(lastAddr) + ";");
- leaveMethod();
- indent--;
- if(debugCompiler)
- p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(pc&0xffffffffL,16) + \" (got here from 0x\" + Long.toString(lastPC&0xffffffffL,16)+\")\");");
- else
- p("default: throw new ExecutionException(\"invalid address 0x\" + Long.toString(pc&0xffffffffL,16));");
- indent--;
- p("}"); // end switch
- p("/* NOT REACHED */");
- indent--;
- p("}"); // end for
- indent--;
- p("}"); // end method
- endOfMethod = startOfMethod = 0;
- }
-
- private HashMap relativeAddrs = new HashMap();
- private String constant(int target) {
- if(target >= 4096 && lessConstants) {
- int n = target & ~1023;
- String var = "N_" + toHex8(n);
- if(relativeAddrs.get(new Integer(n)) == null) {
- relativeAddrs.put(new Integer(n),Boolean.TRUE);
- classLevel.append(indents[1] + "private static int " + var + " = " + toHex(n) + ";\n");
- }
- return "(" + var + " + " + toHex(target - n) + ")";
- } else {
- return toHex(target);
- }
- }
-
- private void branch(int pc, int target) {
- if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
- p("pc=" + constant(target) + ";");
- if(target == 0)
- p("throw new ExecutionException(\"Branch to addr 0x0\");");
- else if((pc&methodMask) == (target&methodMask))
- p("continue;");
- else if(assumeTailCalls)
- p("run_" + Long.toString((target&methodMask)&0xffffffffL, 16) + "(); return;");
- else
- leaveMethod();
- }
-
- private void leaveMethod() {
- p("return;");
- }
-
- private boolean textDone;
- private void emitText(int addr, DataInputStream dis, int size) throws Exn,IOException {
- if(textDone) throw new Exn("Multiple text segments");
- textDone = true;
-
- if((addr&3)!=0 || (size&3)!=0) throw new Exn("Section on weird boundaries");
- int count = size/4;
- int nextInsn = dis.readInt();
- if(nextInsn == -1) throw new Error("Actually read -1 at " + toHex(addr));
- int insn;
-
- for(int i=0;i<count;i++,addr+=4) {
- insn = nextInsn;
- nextInsn = (i == count-1) ? -1 : dis.readInt();
- if(addr >= endOfMethod) { endMethod(); startMethod(addr); }
- if(jumpableAddresses==null || addr == startOfMethod || jumpableAddresses.contains(new Integer(addr))) {
- p("case " + toHex(addr) + ":");
- unreachable = false;
- } else if(unreachable) {
- continue;
- } else if(debugCompiler) {
- p("/" + "* pc = " + toHex(addr) + "*" + "/");
- }
- indent++;
- emitInstruction(addr,insn,nextInsn);
- indent--;
- }
- endMethod(addr);
- p();
- dis.close();
- }
-
- private int initDataCount = 0;
- private void emitData(int addr, DataInputStream dis, int size, boolean readOnly) throws Exn,IOException {
- if((addr&3)!=0 || (size&3)!=0) throw new Exn("Data section on weird boundaries");
- int last = addr + size;
- while(addr < last) {
- int segSize = Math.min(size,28000); // must be a multiple of 56
- StringBuffer sb = new StringBuffer();
- for(int i=0;i<segSize;i+=7) {
- long l = 0;
- for(int j=0;j<7;j++) {
- l <<= 8;
- byte b = (i+j < size) ? dis.readByte() : 1;
- l |= (b & 0xffL);
- }
- for(int j=0;j<8;j++) {
- char c = (char) ((l>>>(7*(7-j)))&0x7f);
- if(c=='\n') sb.append("\\n");
- else if(c=='\r') sb.append("\\r");
- else if(c=='\\') sb.append("\\\\");
- else if(c=='"') sb.append("\\\"");
- else if(c >= 32 && c <= 126) sb.append(c);
- else sb.append("\\" + toOctal3(c));
- }
- }
- String varname = "_data" + (++initDataCount);
- p("private static final int[] " + varname + " = decodeData(\"" + sb.toString() + "\"," + toHex(segSize/4) + ");");
- inits.append(indents[2] + "initPages(" + varname +"," + toHex(addr) + "," + (readOnly?"true":"false") + ");\n");
- addr += segSize;
- size -= segSize;
- }
- dis.close();
- }
-
- private void emitBSS(int addr, int size) throws Exn {
- if((addr&3)!=0) throw new Exn("BSS section on weird boundaries");
- size = (size+3)&~3;
- int count = size/4;
- inits.append(indents[2] + "clearPages(" + toHex(addr) + "," + toHex(count) + ");\n");
- }
-
- // True if the current code path is unreachable (any instruction with a case statement is reachable)
- private boolean unreachable = false;
-
- private void emitInstruction(int pc, int insn, int nextInsn) throws IOException,Exn {
- if(insn == -1) throw new Error("insn is -1");
-
- int op = (insn >>> 26) & 0xff; // bits 26-31
- int rs = (insn >>> 21) & 0x1f; // bits 21-25
- int rt = (insn >>> 16) & 0x1f; // bits 16-20
- int ft = (insn >>> 16) & 0x1f;
- int rd = (insn >>> 11) & 0x1f; // bits 11-15
- int fs = (insn >>> 11) & 0x1f;
- int shamt = (insn >>> 6) & 0x1f; // bits 6-10
- int fd = (insn >>> 6) & 0x1f;
- int subcode = insn & 0x3f; // bits 0-5
-
- int jumpTarget = (insn & 0x03ffffff); // bits 0-25
- int unsignedImmediate = insn & 0xffff;
- int signedImmediate = (insn << 16) >> 16;
- int branchTarget = signedImmediate;
-
- int tmp; // temporaries
-
- //if(pc%64==0) p("System.err.println(\"Executing: " + toHex(pc) + "\");");
- //p("/" + "*" + (pc == -1 ? "Delay Slot" : toHex(pc)) + " *" + "/ ");
- if(pc==-1) p("/" + "* Next insn is delay slot *" + "/ ");
-
- if(runtimeStats && op != 0) p("inc(\"opcode: " + op + "\");");
- switch(op) {
- case 0: {
- if(runtimeStats && insn != 0) p("inc(\"opcode: 0/" + subcode + "\");");
- switch(subcode) {
- case 0: // SLL
- if(insn != 0)
- p( "r"+rd+" = r"+rt+" << "+shamt+";");
- break;
- case 2: // SRL
- p( "r"+rd+" = r"+rt+" >>> "+shamt+";");
- break;
- case 3: // SRA
- p( "r"+rd+" = r"+rt+" >> "+shamt+";");
- break;
- case 4: // SLLV
- p( "r"+rd+" = r"+rt+" << (r"+rs+"&0x1f);");
- break;
- case 6: // SRLV
- p( "r"+rd+" = r"+rt+" >>> (r"+rs+"&0x1f);");
- break;
- case 7: // SRAV
- p( "r"+rd+" = r"+rt+" >> (r"+rs+"&0x1f);");
- break;
- case 8: // JR
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- emitInstruction(-1,nextInsn,-1);
- if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
- p("pc=r" + rs + ";");
- leaveMethod();
- unreachable = true;
- break;
- case 9: // JALR
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- emitInstruction(-1,nextInsn,-1);
- if(debugCompiler) p("lastPC = " + toHex(pc) + ";");
- p("pc=r" + rs + ";");
- p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
- leaveMethod();
- unreachable = true;
- break;
- case 12: // SYSCALL
- p("pc = " + toHex(pc) + ";");
- p( "r"+V0+" = syscall(r"+V0+",r"+A0+",r"+A1+",r"+A2+",r"+A3+");");
- p("if (state != RUNNING) {");
- indent++;
- p("pc = " + toHex(pc+4) + ";");
- leaveMethod();
- indent--;
- p("}");
- break;
- case 13: // BREAK
- p( "throw new ExecutionException(\"Break\");");
- break;
- case 16: // MFHI
- p( "r"+rd+" = hi;");
- break;
- case 17: // MTHI
- p( "hi = r"+rs+";");
- break;
- case 18: // MFLO
- p( "r"+rd+" = lo;");
- break;
- case 19: // MTLO
- p( "lo = r"+rs+";");
- break;
- case 24: // MULT
- p( "{ long hilo = (long)(r"+rs+") * ((long)r"+rt+"); " +
- "hi = (int) (hilo >>> 32); " +
- "lo = (int) hilo; }");
- break;
- case 25: // MULTU
- p( "{ long hilo = (r"+rs+" & 0xffffffffL) * (r"+rt+" & 0xffffffffL); " +
- "hi = (int) (hilo >>> 32); " +
- "lo = (int) hilo; } ");
- break;
- case 26: // DIV
- p( "hi = r"+rs+"%r"+rt+"; lo = r"+rs+"/r"+rt+";");
- break;
- case 27: // DIVU
- p("if(r"+rt+"!=0) {");
- p( "hi = (int)((r"+rs+" & 0xffffffffL) % (r"+rt+" & 0xffffffffL)); " +
- "lo = (int)((r"+rs+" & 0xffffffffL) / (r"+rt+" & 0xffffffffL));");
- p("}");
- break;
- case 32: // ADD
- throw new Exn("ADD (add with oveflow trap) not suported");
- /*This must trap on overflow
- p( "r"+rd+" = r"+rs+" + r"+rt+";");
- break;*/
- case 33: // ADDU
- p( "r"+rd+" = r"+rs+" + r"+rt+";");
- break;
- case 34: // SUB
- throw new Exn("SUB (add with oveflow trap) not suported");
- /*This must trap on overflow
- p( "r"+rd+" = r"+rs+" - r"+rt+";");
- break;*/
- case 35: // SUBU
- p( "r"+rd+" = r"+rs+" - r"+rt+";");
- break;
- case 36: // AND
- p( "r"+rd+" = r"+rs+" & r"+rt+";");
- break;
- case 37: // OR
- p( "r"+rd+" = r"+rs+" | r"+rt+";");
- break;
- case 38: // XOR
- p( "r"+rd+" = r"+rs+" ^ r"+rt+";");
- break;
- case 39: // NOR
- p( "r"+rd+" = ~(r"+rs+" | r"+rt+");");
- break;
- case 42: // SLT
- p( "r"+rd+" = r"+rs+" < r"+rt+" ? 1 : 0;");
- break;
- case 43: // SLTU
- p( "r"+rd+" = ((r"+rs+" & 0xffffffffL) < (r"+rt+" & 0xffffffffL)) ? 1 : 0;");
- break;
- default:
- throw new RuntimeException("Illegal instruction 0/" + subcode);
- }
- break;
- }
- case 1: {
- switch(rt) {
- case 0: // BLTZ
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " < 0) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 1: // BGEZ
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " >= 0) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 16: // BLTZAL
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " < 0) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 17: // BGEZAL
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " >= 0) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- default:
- throw new RuntimeException("Illegal Instruction 1/" + rt);
- }
- break;
- }
- case 2: { // J
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- emitInstruction(-1,nextInsn,-1);
- branch(pc,(pc&0xf0000000)|(jumpTarget << 2));
- unreachable = true;
- break;
- }
- case 3: { // JAL
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- int target = (pc&0xf0000000)|(jumpTarget << 2);
- emitInstruction(-1,nextInsn,-1);
- if(optimizedMemcpy && (target == memcpy || target == memset)) {
- if(target == memcpy)
- p("memcpy(r4,r5,r6);");
- else if(target == memset)
- p("memset(r4,r5,r6);");
- p("r2 = r4;");
- branch(pc,pc+8);
- } else {
- p("r" + RA + "=" + constant(pc+8 /*skip this insn and delay slot*/) + ";");
- branch(pc, target);
- }
- unreachable = true;
- break;
- }
- case 4: // BEQ
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " == r" + rt + ") {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 5: // BNE
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " != r" + rt + ") {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 6: //BLEZ
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " <= 0) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 7: //BGTZ
- if(pc == -1) throw new Error("pc modifying insn in delay slot");
- p("if(r" + rs + " > 0) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- case 8: // ADDI
- p( "r"+rt+" = r"+rs+" + "+signedImmediate +";");
- break;
- case 9: // ADDIU
- p( "r"+rt+" = r"+rs+" + "+signedImmediate+";");
- break;
- case 10: // SLTI
- p( "r"+rt+" = r"+rs+" < "+signedImmediate+" ? 1 : 0;");
- break;
- case 11: // SLTIU
- p( "r"+rt+" = (r"+rs+"&0xffffffffL) < ("+unsignedImmediate+"&0xffffffffL) ? 1 : 0;");
- break;
- case 12: // ANDI
- p( "r"+rt+" = r"+rs+" & "+unsignedImmediate+";");
- break;
- case 13: // ORI
- p( "r"+rt+" = r"+rs+" | "+unsignedImmediate+";");
- break;
- case 14: // XORI
- p( "r"+rt+" = r"+rs+" ^ "+unsignedImmediate+";");
- break;
- case 15: // LUI
- p( "r"+rt+" = "+unsignedImmediate+" << 16;");
- break;
- case 16:
- throw new Exn("TLB/Exception support not implemented");
- case 17: { // FPU
- switch(rs) {
- case 0: // MFC.1
- p( "r"+rt+" = f"+rd+";");
- break;
- case 2: // CFC.1
- if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
- p( "r"+rt+" = fcsr;");
- break;
- case 4: // MTC.1
- p( "f"+rd+" = r"+rt+";");
- break;
- case 6: // CTC.1
- if(fs != 31) throw new Exn("FCR " + fs + " unavailable");
- p( "fcsr = r"+rt+";");
- break;
- case 8: {// BC1F, BC1T
- tmp = (insn>>>16)&1;
- p("if(((fcsr&0x800000)!=0) == (" + tmp + "!=0)) {");
- indent++;
- emitInstruction(-1,nextInsn,-1);
- branch(pc,pc+branchTarget*4+4);
- indent--;
- p("}");
- break;
- }
- case 16: { // Single
- switch(subcode) {
- case 0: // ADD.S
- p(setFloat(fd,getFloat(fs)+"+"+getFloat(ft)));
- break;
- case 1: // SUB.S
- p(setFloat(fd,getFloat(fs)+"-"+getFloat(ft)));
- break;
- case 2: // MUL.S
- p(setFloat(fd,getFloat(fs)+"*"+getFloat(ft)));
- break;
- case 3: // DIV.S
- p(setFloat(fd,getFloat(fs)+"/"+getFloat(ft)));
- break;
- case 5: // ABS.S
- p(setFloat(fd,"Math.abs("+getFloat(fs)+")"));
- break;
- case 6: // MOV.S
- p("f"+fd+" = f"+fs+"; // MOV.S");
- break;
- case 7: // NEG.S
- p(setFloat(fd,"-"+getFloat(fs)));
- break;
- case 33: // CVT.D.S
- p(setDouble(fd,"(float)"+getFloat(fs)));
- break;
- case 36: // CVT.W.D
- p("switch(fcsr & 3) {");
- indent++;
- p("case 0: f"+fd+" = (int)Math.floor("+getFloat(fs)+"+0.5); break; // Round to nearest");
- p("case 1: f"+fd+" = (int)"+getFloat(fs)+"; break; // Round towards zero");
- p("case 2: f"+fd+" = (int)Math.ceil("+getFloat(fs)+"); break; // Round towards plus infinity");
- p("case 3: f"+fd+" = (int)Math.floor("+getFloat(fs)+"); break; // Round towards minus infinity");
- indent--;
- p("}");
- break;
- case 50: // C.EQ.S
- p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"=="+getFloat(ft)+") ? 0x800000 : 0x000000);");
- break;
- case 60: // C.LT.S
- p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"<"+getFloat(ft)+") ? 0x800000 : 0x000000);");
- break;
- case 62: // C.LE.S
- p("fcsr = (fcsr&~0x800000) | (("+getFloat(fs)+"<="+getFloat(ft)+") ? 0x800000 : 0x000000);");
- break;
- default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
- }
- break;
- }
- case 17: { // Double
- switch(subcode) {
- case 0: // ADD.D
- p(setDouble(fd,getDouble(fs)+"+"+getDouble(ft)));
- break;
- case 1: // SUB.D
- p(setDouble(fd,getDouble(fs)+"-"+getDouble(ft)));
- break;
- case 2: // MUL.D
- p(setDouble(fd,getDouble(fs)+"*"+getDouble(ft)));
- break;
- case 3: // DIV.D
- p(setDouble(fd,getDouble(fs)+"/"+getDouble(ft)));
- break;
- case 5: // ABS.D
- p(setDouble(fd,"Math.abs("+getDouble(fs)+")"));
- break;
- case 6: // MOV.D
- p("f"+fd+" = f"+fs+";");
- p("f"+(fd+1)+" = f"+(fs+1)+";");
- break;
- case 7: // NEG.D
- p(setDouble(fd,"-"+getDouble(fs)));
- break;
- case 32: // CVT.S.D
- p(setFloat(fd,"(float)"+getDouble(fs)));
- break;
- case 36: // CVT.W.D
- p("switch(fcsr & 3) {");
- indent++;
- p("case 0: f"+fd+" = (int)Math.floor("+getDouble(fs)+"+0.5); break; // Round to nearest");
- p("case 1: f"+fd+" = (int)"+getDouble(fs)+"; break; // Round towards zero");
- p("case 2: f"+fd+" = (int)Math.ceil("+getDouble(fs)+"); break; // Round towards plus infinity");
- p("case 3: f"+fd+" = (int)Math.floor("+getDouble(fs)+"); break; // Round towards minus infinity");
- indent--;
- p("}");
- break;
- case 50: // C.EQ.D
- p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"=="+getDouble(ft)+") ? 0x800000 : 0x000000);");
- break;
- case 60: // C.LT.D
- p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"<"+getDouble(ft)+") ? 0x800000 : 0x000000);");
- break;
- case 62: // C.LE.D
- p("fcsr = (fcsr&~0x800000) | (("+getDouble(fs)+"<="+getDouble(ft)+") ? 0x800000 : 0x000000);");
- break;
- default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
- }
- break;
- }
- case 20: { // Integer
- switch(subcode) {
- case 32: // CVT.S.W
- p(" // CVS.S.W");
- p(setFloat(fd,"((float)f"+fs+")"));
- break;
- case 33: // CVT.D.W
- p(setDouble(fd,"((double)f"+fs+")"));
- break;
- default: throw new Exn("Invalid Instruction 17/" + rs + "/" + subcode);
- }
- break;
- }
- default:
- throw new Exn("Invalid Instruction 17/" + rs);
- }
- break;
- }
- case 18: case 19:
- throw new Exn("coprocessor 2 and 3 instructions not available");
- case 32: { // LB
- if(runtimeStats) p("inc(\"LB\");");
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp>>>(((~addr)&3)<<3)) & 0xff;");
- p("if((tmp&0x80)!=0) tmp |= 0xffffff00; /* sign extend */");
- p("r"+rt+" = tmp;");
- break;
- }
- case 33: { // LH
- if(runtimeStats) p("inc(\"LH\");");
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp>>>(((~addr)&2)<<3)) & 0xffff;");
- p("if((tmp&0x8000)!=0) tmp |= 0xffff0000; /* sign extend */");
- p("r"+rt+" = tmp;");
- break;
- }
- case 34: { // LWL;
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("r" + rt + " = (r"+rt+"&(0x00ffffff>>>(((~addr)&3)<<3)))|(tmp<<((addr&3)<<3));");
- break;
- /*p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr&~3","tmp");
- p("switch(addr&3) {");
- indent++;
- p("case 0: r"+rt+" = (r"+rt+"&0x00000000)|(tmp<< 0); break;");
- p("case 1: r"+rt+" = (r"+rt+"&0x000000ff)|(tmp<< 8); break;");
- p("case 2: r"+rt+" = (r"+rt+"&0x0000ffff)|(tmp<<16); break;");
- p("case 3: r"+rt+" = (r"+rt+"&0x00ffffff)|(tmp<<24); break;");
- indent--;
- p("}");
- break;*/
- }
- case 35: // LW
- if(runtimeStats) p("inc(\"LW\");");
- memRead("r" + rs +"+"+signedImmediate,"r"+rt);
- break;
- case 36: { // LBU
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp>>>(((~addr)&3)<<3)) & 0xff;");
- p("r"+rt+" = tmp;");
- break;
- }
- case 37: { // LHU
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp>>>(((~addr)&2)<<3)) & 0xffff;");
- p("r"+rt+" = tmp;");
- break;
- }
- case 38: { // LWR
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("r" + rt + " = (r"+rt+"&(0xffffff00<<((addr&3)<<3)))|(tmp>>>(((~addr)&3)<<3));");
- break;
-
- /*p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr&~3","tmp");
- p("switch(addr&3) {");
- indent++;
- p("case 0: r"+rt+" = (r"+rt+"&0xffffff00)|(tmp>>>24); break;");
- p("case 1: r"+rt+" = (r"+rt+"&0xffff0000)|(tmp>>>16); break;");
- p("case 2: r"+rt+" = (r"+rt+"&0xff000000)|(tmp>>> 8); break;");
- p("case 3: r"+rt+" = (r"+rt+"&0x00000000)|(tmp>>> 0); break;");
- indent--;
- p("}");
- break;*/
-
- }
- case 40: { // SB
- if(runtimeStats) p("inc(\"SB\");");
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp&~(0xff000000>>>((addr&3)<<3)))|((r"+rt+"&0xff)<<(((~addr)&3)<<3));");
- memWrite("addr","tmp");
- break;
- }
- case 41: { // SH
- if(runtimeStats) p("inc(\"SH\");");
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp&(0xffff<<((addr&2)<<3)))|((r" + rt + "&0xffff)<<(((~addr)&2)<<3));");
- memWrite("addr","tmp");
- break;
- }
- case 42: { // SWL
- p(" // SWL");
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp&(0xffffff00<<(((~addr)&3)<<3)))|(r"+rt+">>>((addr&3)<<3));");
- memWrite("addr","tmp");
- break;
- }
- case 43: // SW
- if(runtimeStats) p("inc(\"SW\");");
- memWrite("r"+rs+"+"+signedImmediate,"r" + rt);
- break;
- case 46: { // SWR
- p(" // SWR");
- p("addr=r" + rs +"+"+signedImmediate + ";");
- memRead("addr","tmp");
- p("tmp = (tmp&(0x00ffffff>>>((addr&3)<<3)))|(r"+rt+"<<(((~addr)&3)<<3));");
- memWrite("addr","tmp");
- break;
- }
- // FEATURE: Need to be atomic if threads
- case 48: // LWC0/LL
- memRead("r"+rs+"+"+signedImmediate,"r"+rt);
- break;
- case 49: // LWC1
- memRead("r"+rs+"+"+signedImmediate,"f"+rt);
- break;
- // FEATURE: Needs to be atomic if threads
- case 56: // SWC1/SC
- memWrite("r"+rs+"+"+signedImmediate,"r"+rt);
- p("r" + rt + "=1;");
- break;
- case 57: // SWC1
- memWrite("r"+rs+"+"+signedImmediate,"f"+rt);
- break;
- default:
- throw new Exn("Invalid Instruction: " + op + " at " + toHex(pc));
- }
- }
-
- // Helper functions for emitText
- // NOTE: memWrite and memRead MUST discard the last two bits of addr
- private void memWrite(String addr, String target) {
- if(nullPointerCheck) p("nullPointerCheck(" + addr + ");");
- if(onePage)
- p("page[(" + addr + ")>>>2] = " + target + ";");
- else if(fastMem)
- p("writePages[("+addr+")>>>"+pageShift+"][(("+addr+")>>>2)&"+toHex((pageSize>>2)-1)+"] = " + target + ";");
- else
- p("unsafeMemWrite(" + addr + "," + target + ");");
- }
- private void memRead(String addr, String target) {
- if(nullPointerCheck) p("nullPointerCheck(" + addr + ");");
- if(onePage)
- p(target + "= page[(" + addr + ")>>>2];");
- else if(fastMem)
- p(target + " = readPages[("+addr+")>>>"+pageShift+"][(("+addr+")>>>2)&"+toHex((pageSize>>2)-1)+"];");
- else
- p(target + " = unsafeMemRead(" + addr + ");");
- }
- private static String getFloat(int r) { return "(Float.intBitsToFloat(f"+r+"))"; }
- private static String getDouble(int r) {
- return "(Double.longBitsToDouble(((f"+(r+1)+"&0xffffffffL) << 32) | (f"+r+"&0xffffffffL)))";
- }
- private static String setFloat(int r, String expr) { return "f"+r+"=Float.floatToRawIntBits("+expr+");"; }
- private static String setDouble(int r, String expr) {
- return "{ long l = Double.doubleToLongBits("+expr+"); "+
- "f"+(r+1)+" = (int)(l >>> 32); f"+r+" = (int)l; }";
- }
-}
-
\ No newline at end of file
projects / nestedvm.git / blobdiff