X-Git-Url: http://git.megacz.com/?p=nestedvm.git;a=blobdiff_plain;f=src%2Forg%2Fxwt%2Fmips%2FInterpreter.java;fp=src%2Forg%2Fxwt%2Fmips%2FInterpreter.java;h=0000000000000000000000000000000000000000;hp=f95df9292b067fc357f6014aec8540643201228f;hb=c2b2704764af1ade923ba8f15d517b87f9d16189;hpb=90f1aff73ed698ab5992fbd7eb53c1ba7329b1a5 diff --git a/src/org/xwt/mips/Interpreter.java b/src/org/xwt/mips/Interpreter.java deleted file mode 100644 index f95df92..0000000 --- a/src/org/xwt/mips/Interpreter.java +++ /dev/null @@ -1,757 +0,0 @@ -// Copyright 2003 Brian Alliet -// Based on org.xwt.imp.MIPS by Adam Megacz -// Portions Copyright 2003 Adam Megacz - -package org.xwt.mips; - -import org.xwt.mips.util.*; -import java.io.*; - -public class Interpreter extends UnixRuntime { - // Registers - private int[] registers = new int[32]; - private int hi,lo; - - // Floating Point Registers - private int[] fpregs = new int[32]; - // 24-31 - unused - // 23 - conditional bit - // 18-22 - unused - // 12-17 - cause bits (unimplemented) - // 7-11 - enables bits (unimplemented) - // 2-6 - flags (unimplemented) - // 0-1 - rounding mode (only implemented for fixed point conversions) - private int fcsr; - - private int pc; - - // The filename if the binary we're running - public String image; - private ELF.Symtab symtab; - - // Register Operations - private final void setFC(boolean b) { fcsr = (fcsr&~0x800000) | (b ? 0x800000 : 0x000000); } - private final int roundingMode() { return fcsr & 3; /* bits 0-1 */ } - private final double getDouble(int r) { - return Double.longBitsToDouble(((fpregs[r+1]&0xffffffffL) << 32) | (fpregs[r]&0xffffffffL)); - } - private final void setDouble(int r, double d) { - long l = Double.doubleToLongBits(d); - fpregs[r+1] = (int)(l >>> 32); fpregs[r] = (int)l; - } - private final float getFloat(int r) { return Float.intBitsToFloat(fpregs[r]); } - private final void setFloat(int r, float f) { fpregs[r] = Float.floatToRawIntBits(f); } - - protected void _execute() throws ExecutionException { - try { - runSome(); - } catch(ExecutionException e) { - e.setLocation(toHex(pc) + ": " + sourceLine(pc)); - throw e; - } - } - - // Main interpretor - // the return value is meaningless, its just to catch people typing "return" by accident - private final int runSome() throws FaultException,ExecutionException { - int[] r = registers; - int[] f = fpregs; - int pc = this.pc; - int nextPC = pc + 4; - try { - OUTER: for(;;) { - int insn; - try { - insn = readPages[pc>>>PAGE_SHIFT][(pc>>>2)&PAGE_WORDS-1]; - } catch (RuntimeException e) { - insn = memRead(pc); - } - - 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, addr; // temporaries - - r[ZERO] = 0; - - switch(op) { - case 0: { - switch(subcode) { - case 0: // SLL - if(insn == 0) break; - r[rd] = r[rt] << shamt; - break; - case 2: // SRL - r[rd] = r[rt] >>> shamt; - break; - case 3: // SRA - r[rd] = r[rt] >> shamt; - break; - case 4: // SLLV - r[rd] = r[rt] << (r[rs]&0x1f); - break; - case 6: // SRLV - r[rd] = r[rt] >>> (r[rs]&0x1f); - break; - case 7: // SRAV - r[rd] = r[rt] >> (r[rs]&0x1f); - break; - case 8: // JR - tmp = r[rs]; pc += 4; nextPC = tmp; - continue OUTER; - case 9: // JALR - tmp = r[rs]; pc += 4; r[rd] = pc+4; nextPC = tmp; - continue OUTER; - case 12: // SYSCALL - this.pc = pc; - r[V0] = syscall(r[V0],r[A0],r[A1],r[A2],r[A3]); - if(state != RUNNING) { this.pc = nextPC; break OUTER; } - break; - case 13: // BREAK - throw new ExecutionException("Break"); - case 16: // MFHI - r[rd] = hi; - break; - case 17: // MTHI - hi = r[rs]; - break; - case 18: // MFLO - r[rd] = lo; - break; - case 19: // MTLO - lo = r[rs]; - break; - case 24: { // MULT - long hilo = (long)(r[rs]) * ((long)r[rt]); - hi = (int) (hilo >>> 32); - lo = (int) hilo; - break; - } - case 25: { // MULTU - long hilo = (r[rs] & 0xffffffffL) * (r[rt] & 0xffffffffL); - hi = (int) (hilo >>> 32); - lo = (int) hilo; - break; - } - case 26: // DIV - hi = r[rs]%r[rt]; - lo = r[rs]/r[rt]; - break; - case 27: // DIVU - if(rt != 0) { - hi = (int)((r[rs] & 0xffffffffL) % (r[rt] & 0xffffffffL)); - lo = (int)((r[rs] & 0xffffffffL) / (r[rt] & 0xffffffffL)); - } - break; - case 32: // ADD - throw new ExecutionException("ADD (add with oveflow trap) not suported"); - /*This must trap on overflow - r[rd] = r[rs] + r[rt]; - break;*/ - case 33: // ADDU - r[rd] = r[rs] + r[rt]; - break; - case 34: // SUB - throw new ExecutionException("SUB (sub with oveflow trap) not suported"); - /*This must trap on overflow - r[rd] = r[rs] - r[rt]; - break;*/ - case 35: // SUBU - r[rd] = r[rs] - r[rt]; - break; - case 36: // AND - r[rd] = r[rs] & r[rt]; - break; - case 37: // OR - r[rd] = r[rs] | r[rt]; - break; - case 38: // XOR - r[rd] = r[rs] ^ r[rt]; - break; - case 39: // NOR - r[rd] = ~(r[rs] | r[rt]); - break; - case 42: // SLT - r[rd] = r[rs] < r[rt] ? 1 : 0; - break; - case 43: // SLTU - r[rd] = ((r[rs] & 0xffffffffL) < (r[rt] & 0xffffffffL)) ? 1 : 0; - break; - default: - throw new ExecutionException("Illegal instruction 0/" + subcode); - } - break; - } - case 1: { - switch(rt) { - case 0: // BLTZ - if(r[rs] < 0) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 1: // BGEZ - if(r[rs] >= 0) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 16: // BLTZAL - if(r[rs] < 0) { - pc += 4; r[RA] = pc+4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 17: // BGEZAL - if(r[rs] >= 0) { - pc += 4; r[RA] = pc+4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - default: - throw new ExecutionException("Illegal Instruction"); - } - break; - } - case 2: { // J - tmp = (pc&0xf0000000) | (jumpTarget << 2); - pc+=4; nextPC = tmp; - continue OUTER; - } - case 3: { // JAL - tmp = (pc&0xf0000000) | (jumpTarget << 2); - pc+=4; r[RA] = pc+4; nextPC = tmp; - continue OUTER; - } - case 4: // BEQ - if(r[rs] == r[rt]) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 5: // BNE - if(r[rs] != r[rt]) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 6: //BLEZ - if(r[rs] <= 0) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 7: //BGTZ - if(r[rs] > 0) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 8: // ADDI - r[rt] = r[rs] + signedImmediate; - break; - case 9: // ADDIU - r[rt] = r[rs] + signedImmediate; - break; - case 10: // SLTI - r[rt] = r[rs] < signedImmediate ? 1 : 0; - break; - case 11: // SLTIU - r[rt] = (r[rs]&0xffffffffL) < (unsignedImmediate&0xffffffffL) ? 1 : 0; - break; - case 12: // ANDI - r[rt] = r[rs] & unsignedImmediate; - break; - case 13: // ORI - r[rt] = r[rs] | unsignedImmediate; - break; - case 14: // XORI - r[rt] = r[rs] ^ unsignedImmediate; - break; - case 15: // LUI - r[rt] = unsignedImmediate << 16; - break; - case 16: - throw new ExecutionException("TLB/Exception support not implemented"); - case 17: { // FPU - boolean debug = false; - String line = debug ? sourceLine(pc) : ""; - boolean debugon = debug && (line.indexOf("dtoa.c:51") >= 0 || line.indexOf("dtoa.c:52") >= 0 || line.indexOf("test.c") >= 0); - if(rs > 8 && debugon) - System.out.println(" FP Op: " + op + "/" + rs + "/" + subcode + " " + line); - if(roundingMode() != 0 && rs != 6 /*CTC.1*/ && !((rs==16 || rs==17) && subcode == 36 /* CVT.W.Z */)) - throw new ExecutionException("Non-cvt.w.z operation attempted with roundingMode != round to nearest"); - switch(rs) { - case 0: // MFC.1 - r[rt] = f[rd]; - break; - case 2: // CFC.1 - if(fs != 31) throw new ExecutionException("FCR " + fs + " unavailable"); - r[rt] = fcsr; - break; - case 4: // MTC.1 - f[rd] = r[rt]; - break; - case 6: // CTC.1 - if(fs != 31) throw new ExecutionException("FCR " + fs + " unavailable"); - fcsr = r[rt]; - break; - case 8: // BC1F, BC1T - if(((fcsr&0x800000)!=0) == (((insn>>>16)&1)!=0)) { - pc += 4; tmp = pc + branchTarget*4; nextPC = tmp; - continue OUTER; - } - break; - case 16: { // Single - switch(subcode) { - case 0: // ADD.S - setFloat(fd,getFloat(fs)+getFloat(ft)); - break; - case 1: // SUB.S - setFloat(fd,getFloat(fs)-getFloat(ft)); - break; - case 2: // MUL.S - setFloat(fd,getFloat(fs)*getFloat(ft)); - break; - case 3: // DIV.S - setFloat(fd,getFloat(fs)/getFloat(ft)); - break; - case 5: // ABS.S - setFloat(fd,Math.abs(getFloat(fs))); - break; - case 6: // MOV.S - f[fd] = f[fs]; - break; - case 7: // NEG.S - setFloat(fd,-getFloat(fs)); - break; - case 33: // CVT.D.S - setDouble(fd,getFloat(fs)); - break; - case 36: // CVT.W.S - switch(roundingMode()) { - case 0: f[fd] = (int)Math.floor(getFloat(fs)+0.5f); break; // Round to nearest - case 1: f[fd] = (int)getFloat(fs); break; // Round towards zero - case 2: f[fd] = (int)Math.ceil(getFloat(fs)); break; // Round towards plus infinity - case 3: f[fd] = (int)Math.floor(getFloat(fs)); break; // Round towards minus infinity - } - break; - case 50: // C.EQ.S - setFC(getFloat(fs) == getFloat(ft)); - break; - case 60: // C.LT.S - setFC(getFloat(fs) < getFloat(ft)); - break; - default: throw new ExecutionException("Invalid Instruction 17/" + rs + "/" + subcode + " at " + sourceLine(pc)); - } - break; - } - case 17: { // Double - switch(subcode) { - case 0: // ADD.D - setDouble(fd,getDouble(fs)+getDouble(ft)); - break; - case 1: // SUB.D - if(debugon) System.out.println("f" + fd + " = f" + fs + " (" + getDouble(fs) + ") - f" + ft + " (" + getDouble(ft) + ")"); - setDouble(fd,getDouble(fs)-getDouble(ft)); - break; - case 2: // MUL.D - if(debugon) System.out.println("f" + fd + " = f" + fs + " (" + getDouble(fs) + ") * f" + ft + " (" + getDouble(ft) + ")"); - setDouble(fd,getDouble(fs)*getDouble(ft)); - if(debugon) System.out.println("f" + fd + " = " + getDouble(fd)); - break; - case 3: // DIV.D - setDouble(fd,getDouble(fs)/getDouble(ft)); - break; - case 5: // ABS.D - setDouble(fd,Math.abs(getDouble(fs))); - break; - case 6: // MOV.D - f[fd] = f[fs]; - f[fd+1] = f[fs+1]; - break; - case 7: // NEG.D - setDouble(fd,-getDouble(fs)); - break; - case 32: // CVT.S.D - setFloat(fd,(float)getDouble(fs)); - break; - case 36: // CVT.W.D - if(debugon) System.out.println("CVT.W.D rm: " + roundingMode() + " f" + fs + ":" + getDouble(fs)); - switch(roundingMode()) { - case 0: f[fd] = (int)Math.floor(getDouble(fs)+0.5); break; // Round to nearest - case 1: f[fd] = (int)getDouble(fs); break; // Round towards zero - case 2: f[fd] = (int)Math.ceil(getDouble(fs)); break; // Round towards plus infinity - case 3: f[fd] = (int)Math.floor(getDouble(fs)); break; // Round towards minus infinity - } - if(debugon) System.out.println("CVT.W.D: f" + fd + ":" + f[fd]); - break; - case 50: // C.EQ.D - setFC(getDouble(fs) == getDouble(ft)); - break; - case 60: // C.LT.D - setFC(getDouble(fs) < getDouble(ft)); - break; - case 62: // C.LE.D - setFC(getDouble(fs) <= getDouble(ft)); - break; - default: throw new ExecutionException("Invalid Instruction 17/" + rs + "/" + subcode + " at " + sourceLine(pc)); - } - break; - } - case 20: { // Integer - switch(subcode) { - case 33: // CVT.D.W - setDouble(fd,f[fs]); - break; - default: throw new ExecutionException("Invalid Instruction 17/" + rs + "/" + subcode + " at " + sourceLine(pc)); - } - break; - } - default: - throw new ExecutionException("Invalid Instruction 17/" + rs); - } - break; - } - case 18: case 19: - throw new ExecutionException("No coprocessor installed"); - case 32: { // LB - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&3) { - case 0: tmp = (tmp>>>24)&0xff; break; - case 1: tmp = (tmp>>>16)&0xff; break; - case 2: tmp = (tmp>>> 8)&0xff; break; - case 3: tmp = (tmp>>> 0)&0xff; break; - } - if((tmp&0x80)!=0) tmp |= 0xffffff00; // sign extend - r[rt] = tmp; - break; - } - case 33: { // LH - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&2) { - case 0: tmp = (tmp>>>16)&0xffff; break; - case 2: tmp = (tmp>>> 0)&0xffff; break; - } - if((tmp&0x8000)!=0) tmp |= 0xffff0000; // sign extend - r[rt] = tmp; - break; - } - case 34: { // LWL; - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&3) { - case 0: r[rt] = (r[rt]&0x00000000)|(tmp<< 0); break; - case 1: r[rt] = (r[rt]&0x000000ff)|(tmp<< 8); break; - case 2: r[rt] = (r[rt]&0x0000ffff)|(tmp<<16); break; - case 3: r[rt] = (r[rt]&0x00ffffff)|(tmp<<24); break; - } - break; - } - case 35: // LW - addr = r[rs] + signedImmediate; - try { - r[rt] = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - r[rt] = memRead(addr); - } - break; - case 36: { // LBU - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr); - } - switch(addr&3) { - case 0: r[rt] = (tmp>>>24)&0xff; break; - case 1: r[rt] = (tmp>>>16)&0xff; break; - case 2: r[rt] = (tmp>>> 8)&0xff; break; - case 3: r[rt] = (tmp>>> 0)&0xff; break; - } - break; - } - case 37: { // LHU - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&2) { - case 0: r[rt] = (tmp>>>16)&0xffff; break; - case 2: r[rt] = (tmp>>> 0)&0xffff; break; - } - break; - } - case 38: { // LWR - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&3) { - case 0: r[rt] = (r[rt]&0xffffff00)|(tmp>>>24); break; - case 1: r[rt] = (r[rt]&0xffff0000)|(tmp>>>16); break; - case 2: r[rt] = (r[rt]&0xff000000)|(tmp>>> 8); break; - case 3: r[rt] = (r[rt]&0x00000000)|(tmp>>> 0); break; - } - break; - } - case 40: { // SB - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&3) { - case 0: tmp = (tmp&0x00ffffff) | ((r[rt]&0xff)<<24); break; - case 1: tmp = (tmp&0xff00ffff) | ((r[rt]&0xff)<<16); break; - case 2: tmp = (tmp&0xffff00ff) | ((r[rt]&0xff)<< 8); break; - case 3: tmp = (tmp&0xffffff00) | ((r[rt]&0xff)<< 0); break; - } - try { - writePages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)] = tmp; - } catch(RuntimeException e) { - memWrite(addr&~3,tmp); - } - break; - } - case 41: { // SH - addr = r[rs] + signedImmediate; - try { - tmp = readPages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)]; - } catch(RuntimeException e) { - tmp = memRead(addr&~3); - } - switch(addr&2) { - case 0: tmp = (tmp&0x0000ffff) | ((r[rt]&0xffff)<<16); break; - case 2: tmp = (tmp&0xffff0000) | ((r[rt]&0xffff)<< 0); break; - } - try { - writePages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)] = tmp; - } catch(RuntimeException e) { - memWrite(addr&~3,tmp); - } - break; - } - case 42: { // SWL - addr = r[rs] + signedImmediate; - tmp = memRead(addr&~3); - switch(addr&3) { - case 0: tmp=(tmp&0x00000000)|(r[rt]>>> 0); break; - case 1: tmp=(tmp&0xff000000)|(r[rt]>>> 8); break; - case 2: tmp=(tmp&0xffff0000)|(r[rt]>>>16); break; - case 3: tmp=(tmp&0xffffff00)|(r[rt]>>>24); break; - } - try { - writePages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)] = tmp; - } catch(RuntimeException e) { - memWrite(addr&~3,tmp); - } - break; - } - case 43: // SW - addr = r[rs] + signedImmediate; - try { - writePages[addr>>>PAGE_SHIFT][(addr>>>2)&(PAGE_WORDS-1)] = r[rt]; - } catch(RuntimeException e) { - memWrite(addr&~3,r[rt]); - } - break; - case 46: { // SWR - addr = r[rs] + signedImmediate; - tmp = memRead(addr&~3); - switch(addr&3) { - case 0: tmp=(tmp&0x00ffffff)|(r[rt]<<24); break; - case 1: tmp=(tmp&0x0000ffff)|(r[rt]<<16); break; - case 2: tmp=(tmp&0x000000ff)|(r[rt]<< 8); break; - case 3: tmp=(tmp&0x00000000)|(r[rt]<< 0); break; - } - memWrite(addr&~3,tmp); - break; - } - // FEATURE: Needs to be atomic w/ threads - case 48: // LWC0/LL - r[rt] = memRead(r[rs] + signedImmediate); - break; - case 49: // LWC1 - f[rt] = memRead(r[rs] + signedImmediate); - break; - // FEATURE: Needs to be atomic w/ threads - case 56: - memWrite(r[rs] + signedImmediate,r[rt]); - r[rt] = 1; - break; - case 57: // SWC1 - memWrite(r[rs] + signedImmediate,f[rt]); - break; - default: - throw new ExecutionException("Invalid Instruction: " + op); - } - pc = nextPC; - nextPC = pc + 4; - } // for(;;) - } catch(ExecutionException e) { - this.pc = pc; - throw e; - } - return 0; - } - - public int lookupSymbol(String name) { - ELF.Symbol sym = symtab.getGlobalSymbol(name); - return sym == null ? -1 : sym.addr; - } - - // Image loading function - private void loadImage(SeekableData data) throws IOException { - if(state != UNINITIALIZED) throw new IllegalStateException("loadImage called on initialized runtime"); - - ELF elf = new ELF(data); - symtab = elf.getSymtab(); - - if(elf.header.type != ELF.ELFHeader.ET_EXEC) throw new IOException("Binary is not an executable"); - if(elf.header.machine != ELF.ELFHeader.EM_MIPS) throw new IOException("Binary is not for the MIPS I Architecture"); - if(elf.ident.data != ELF.ELFIdent.ELFDATA2MSB) throw new IOException("Binary is not big endian"); - - entryPoint = elf.header.entry; - - ELF.Symtab symtab = elf.getSymtab(); - if(symtab == null) throw new IOException("No symtab in binary (did you strip it?)"); - ELF.Symbol userInfo = symtab.getGlobalSymbol("user_info"); - ELF.Symbol gpsym = symtab.getGlobalSymbol("_gp"); - - if(gpsym == null) throw new IOException("NO _gp symbol!"); - gp = gpsym.addr; - - if(userInfo != null) { - userInfoBase = userInfo.addr; - userInfoSize = userInfo.size; - } - - ELF.PHeader[] pheaders = elf.pheaders; - int brk = 0; - for(int i=0;i>> PAGE_SHIFT; - if(readPages[page] == null) - readPages[page] = new int[PAGE_WORDS]; - if(ph.writable()) writePages[page] = readPages[page]; - } - if(filesize != 0) { - filesize = filesize & ~3; - DataInputStream dis = new DataInputStream(ph.getInputStream()); - do { - readPages[addr >>> PAGE_SHIFT][(addr >>> 2)&(PAGE_WORDS-1)] = dis.readInt(); - addr+=4; - filesize-=4; - } while(filesize > 0); - dis.close(); - } - } - brkAddr = (brk+PAGE_SIZE-1)&~(PAGE_SIZE-1); - state = INITIALIZED; - } - - protected void setCPUState(CPUState state) { - for(int i=1;i<32;i++) registers[i] = state.r[i]; - for(int i=0;i<32;i++) fpregs[i] = state.f[i]; - hi=state.hi; lo=state.lo; fcsr=state.fcsr; - pc=state.pc; - } - - protected CPUState getCPUState() { - CPUState state = new CPUState(); - for(int i=1;i<32;i++) state.r[i] = registers[i]; - for(int i=0;i<32;i++) state.f[i] = fpregs[i]; - state.hi=hi; state.lo=lo; state.fcsr=fcsr; - state.pc=pc; - return state; - } - - // This is package private for fork() which does all kinds of ugly things behind the scenes - Interpreter() { super(4096,65536,true); } - public Interpreter(SeekableData data) throws IOException { this(); loadImage(data); } - public Interpreter(String filename) throws IOException { - this(new SeekableFile(filename,false)); - image = filename; - } - public Interpreter(InputStream is) throws IOException { this(new SeekableInputStream(is)); } - - // Debug functions - // NOTE: This probably requires a jdk > 1.1, however, it is only used for debugging - private java.util.HashMap sourceLineCache; - public String sourceLine(int pc) { - final String addr2line = "mips-unknown-elf-addr2line"; - String line = (String) (sourceLineCache == null ? null : sourceLineCache.get(new Integer(pc))); - if(line != null) return line; - if(image==null) return null; - try { - Process p = java.lang.Runtime.getRuntime().exec(new String[]{addr2line,"-e",image,toHex(pc)}); - line = new BufferedReader(new InputStreamReader(p.getInputStream())).readLine(); - if(line == null) return null; - while(line.startsWith("../")) line = line.substring(3); - if(sourceLineCache == null) sourceLineCache = new java.util.HashMap(); - sourceLineCache.put(new Integer(pc),line); - return line; - } catch(IOException e) { - return null; - } - } - - public class DebugShutdownHook implements Runnable { - public void run() { - int pc = Interpreter.this.pc; - if(getState() == RUNNING) - System.err.print("\nCPU Executing " + toHex(pc) + ": " + sourceLine(pc) + "\n"); - } - } - - public static void main(String[] argv) throws Exception { - String image = argv[0]; - Interpreter emu = new Interpreter(image); - java.lang.Runtime.getRuntime().addShutdownHook(new Thread(emu.new DebugShutdownHook())); - int status = emu.run(argv); - System.err.println("Exit status: " + status); - System.exit(status); - } -}