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V8_PcodeOpEmitter.java
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V8_PcodeOpEmitter.java
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package v8_bytecode;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;
import ghidra.app.plugin.processors.sleigh.SleighLanguage;
import ghidra.app.plugin.processors.sleigh.symbol.Symbol;
import ghidra.app.plugin.processors.sleigh.symbol.UseropSymbol;
import ghidra.program.model.address.Address;
import ghidra.program.model.address.AddressSpace;
import ghidra.program.model.lang.Register;
import ghidra.program.model.pcode.PcodeOp;
import ghidra.program.model.pcode.Varnode;
public class V8_PcodeOpEmitter {
static final String RAM = "ram";
private HashMap<String, Varnode> nameToReg;
private ArrayList<PcodeOp> opList;
private SleighLanguage language;
private AddressSpace defSpace;
private AddressSpace constSpace;
private AddressSpace uniqueSpace;
private Varnode spVarnode;
private Varnode accVarnode;
private Varnode defSpaceId;
private long uniqueBase;
private Address opAddress;
private int seqnum;
private Varnode convertRegisterToVarnode(Register reg) {
Varnode vn = new Varnode(reg.getAddress(), reg.getBitLength() / 8);
return vn;
}
private String findTempName(Address addr) {
if (addr.getAddressSpace() != uniqueSpace) {
return null;
}
for (Entry<String, Varnode> entry : nameToReg.entrySet()) {
if (entry.getValue().getAddress().equals(addr)) {
return entry.getKey();
}
}
return null;
}
private Varnode findRegister(String name) {
Varnode vn = nameToReg.get(name);
if (vn != null) {
return vn;
}
Register reg = language.getRegister(name);
if (reg == null) {
throw new IllegalArgumentException("Register must already exist: " + name);
}
vn = convertRegisterToVarnode(reg);
nameToReg.put(name, vn);
return vn;
}
private Varnode findVarnode(String name, int size) {
Varnode vn = nameToReg.get(name);
if (vn != null) {
if (vn.getSize() != size) {
throw new IllegalArgumentException("Cannot find varnode: " + name);
}
return vn;
}
Register reg = language.getRegister(name);
if (reg != null) {
if (reg.getBitLength() == size * 8) {
vn = convertRegisterToVarnode(reg);
nameToReg.put(name, vn);
return vn;
}
}
vn = new Varnode(uniqueSpace.getAddress(uniqueBase), size);
uniqueBase += 16;
nameToReg.put(name, vn);
return vn;
}
private Varnode constantOrRegister(String name) {
if (name.charAt(0) <= '9') {
long val = Long.decode(name);
return getConstant(val, 8);
}
return findRegister(name);
}
private Varnode getConstant(long val, int size) {
return new Varnode(constSpace.getAddress(val), size);
}
private int findOpCode(String name) {
if (name.equals("cpool")) {
return PcodeOp.CPOOLREF;
}
return PcodeOp.COPY;
}
public V8_PcodeOpEmitter(SleighLanguage language, Address opAddr, long uniqBase) {
Method getSpaceId = null;
nameToReg = new HashMap<String, Varnode>();
opList = new ArrayList<PcodeOp>();
this.language = language;
constSpace = language.getAddressFactory().getConstantSpace();
defSpace = language.getDefaultSpace();
uniqueSpace = language.getAddressFactory().getUniqueSpace();
uniqueBase = uniqBase;
opAddress = opAddr;
seqnum = 0;
spVarnode = findRegister("sp");
accVarnode = findRegister("acc");
String aGetSpaceID = "getSpaceID";
String aGetBaseSpaceID = "getBaseSpaceID";
try {
getSpaceId = defSpace.getClass().getMethod(aGetSpaceID, (Class<?>[])null);
} catch (NoSuchMethodException | SecurityException e1) {
}
try {
getSpaceId = defSpace.getClass().getMethod(aGetBaseSpaceID, (Class<?>[])null);
} catch (NoSuchMethodException | SecurityException e1) {
}
int id;
try {
id = (int) getSpaceId.invoke(defSpace);
defSpaceId = getConstant(id, 4);
} catch (Exception e) {}
}
public PcodeOp[] getPcodeOps() {
PcodeOp[] res = new PcodeOp[opList.size()];
opList.toArray(res);
return res;
}
public void defineTemp(String name, int size) {
Varnode vn = findVarnode(name, size);
if (!vn.isUnique() || vn.getSize() != size) {
throw new IllegalArgumentException("Name is already assigned: " + name);
}
}
/**
* Emits pcode to push a value of computational category 1 onto the stack.
* @param valueName - name of varnode to push.
*/
public void emitPushCat1Value(String valueName) {
Varnode[] in = new Varnode[2];
in[0] = spVarnode;
in[1] = getConstant(4, spVarnode.getSize());
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_SUB, in, spVarnode);
opList.add(op);
in = new Varnode[3];
in[0] = defSpaceId;
in[1] = spVarnode;
in[2] = findRegister(valueName);
op = new PcodeOp(opAddress, seqnum++, PcodeOp.STORE, in);
opList.add(op);
}
/**
* Emits pcode to push a value of computational category 2 onto the stack.
* @param valueName - name of varnode to push.
*/
public void emitPushCat2Value(String valueName) {
Varnode[] in = new Varnode[2];
in[0] = spVarnode;
in[1] = getConstant(8, spVarnode.getSize());
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_SUB, in, spVarnode);
opList.add(op);
in = new Varnode[3];
in[0] = defSpaceId;
in[1] = spVarnode;
in[2] = findRegister(valueName);
op = new PcodeOp(opAddress, seqnum++, PcodeOp.STORE, in);
opList.add(op);
}
/**
* Emits pcode to pop a value of computational category 2 from the stack.
* @param destName - name of destination varnode.
*/
public void emitPopCat2Value(String destName) {
Varnode out = findVarnode(destName, 8);
Varnode[] in = new Varnode[2];
in[0] = defSpaceId;
in[1] = spVarnode;
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.LOAD, in, out);
opList.add(op);
in = new Varnode[2];
in[0] = spVarnode;
in[1] = getConstant(8, spVarnode.getSize());
op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_ADD, in, spVarnode);
opList.add(op);
}
/**
* Emits pcode to pop a value of computational category 1 from the stack.
* @param destName - name of destination varnode.
*/
public void emitPopCat1Value(String destName) {
Varnode out = findVarnode(destName, 4);
Varnode[] in = new Varnode[2];
in[0] = defSpaceId;
in[1] = spVarnode;
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.LOAD, in, out);
opList.add(op);
in = new Varnode[2];
in[0] = spVarnode;
in[1] = getConstant(4, spVarnode.getSize());
op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_ADD, in, spVarnode);
opList.add(op);
}
/**
* Emits pcode to assign four bytes resulting from a call to a black-box pcodeop
* @param varnodeName - varnode name for holding result
* @param size - the size of the result
* @param pcodeop - name of pcodeop
* @param args - zero or more arguments for the pcodeop
*/
public void emitAssignVarnodeFromPcodeOpCall(String varnodeName, int size, String pcodeop,
String... args) {
Symbol useropSym = language.getSymbolTable().findGlobalSymbol(pcodeop);
Varnode out = findVarnode(varnodeName, size);
Varnode[] in;
int opcode;
if (useropSym instanceof UseropSymbol) {
in = new Varnode[args.length + 1];
in[0] = getConstant(((UseropSymbol) useropSym).getIndex(), 4);
for (int i = 0; i < args.length; ++i) {
in[i + 1] = constantOrRegister(args[i]);
}
opcode = PcodeOp.CALLOTHER;
}
else {
in = new Varnode[args.length];
for (int i = 0; i < args.length; ++i) {
in[i] = constantOrRegister(args[i]);
}
opcode = findOpCode(pcodeop);
}
PcodeOp op = new PcodeOp(opAddress, seqnum++, opcode, in, out);
opList.add(op);
}
/**
* Emits pcode to call a void black-box pcodeop
* @param pcodeop - name of pcodeop
* @param args - zero or more arguments for the pcodeop
*/
public void emitVoidPcodeOpCall(String pcodeop, String... args) {
Symbol useropSym = language.getSymbolTable().findGlobalSymbol(pcodeop);
Varnode[] in = new Varnode[args.length + 1];
in[0] = getConstant(((UseropSymbol) useropSym).getIndex(), 4);
for (int i = 0; i < args.length; ++i) {
in[i + 1] = constantOrRegister(args[i]);
}
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.CALLOTHER, in);
opList.add(op);
}
/**
* Appends the pcode to assign an integer constant to a register
* @param register
* @param constant
*/
public void emitAssignConstantToRegister(String register, int constant) {
Varnode out = findRegister(register);
Varnode[] in = new Varnode[1];
in[0] = getConstant(constant, out.getSize());
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.COPY, in, out);
opList.add(op);
}
/**
* Appends the pcode to assign a register to the result of a pcode op call with arguments args
* @param register
* @param pcodeop
* @param args
*/
public void emitAssignRegisterFromPcodeOpCall(String register,
String pcodeop, String... args) {
Symbol useropSym = language.getSymbolTable().findGlobalSymbol(pcodeop);
Varnode out = findRegister(register);
Varnode[] in;
int opcode;
if (useropSym instanceof UseropSymbol) {
in = new Varnode[args.length + 1];
in[0] = getConstant(((UseropSymbol) useropSym).getIndex(), 4);
for (int i = 0; i < args.length; ++i) {
in[i + 1] = constantOrRegister(args[i]);
}
opcode = PcodeOp.CALLOTHER;
}
else {
in = new Varnode[args.length];
for (int i = 0; i < args.length; ++i) {
in[i] = constantOrRegister(args[i]);
}
opcode = findOpCode(pcodeop);
}
PcodeOp op = new PcodeOp(opAddress, seqnum++, opcode, in, out);
opList.add(op);
}
/**
* Appends the pcode to write to a value at an offset of a memory space
* @param space name of space
* @param size size of write
* @param offset offset in space
* @param value value to write
*/
// public void emitWriteToMemory(String space, int size, String offset, String value) {
// Varnode[] in = new Varnode[3];
// AddressSpace spc = language.getAddressFactory().getAddressSpace(space);
// in[0] = getConstant(spc.getSpaceID(), 4);
// if (offset.charAt(0) <= '9') {
// String[] piece = offset.split(":");
// int sz = Integer.parseInt(piece[1]);
// long val = Long.decode(piece[0]);
// in[1] = getConstant(val, sz);
// }
// else {
// in[1] = findRegister(offset);
// }
// in[2] = findVarnode(value, size);
// PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.STORE, in);
// opList.add(op);
// }
/**
* Appends the pcode to emit an indirect call
* @param target varnode to call indirectly
*/
public void emitIndirectCall(String target) {
Varnode[] in = new Varnode[1];
in[0] = findRegister(target);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.CALLIND, in);
opList.add(op);
}
/**
* Appends the pcode to sign-extend the value src into dest
* @param dest target varnode
* @param size size of target varnode
* @param src size of source varnode
*/
public void emitSignExtension(String dest, int size, String src) {
Varnode out = findVarnode(dest, size);
Varnode[] in = new Varnode[1];
in[0] = findRegister(src);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_SEXT, in, out);
opList.add(op);
}
/**
* Appends the pcode to zero-extend the value src into dest
* @param dest target varnode
* @param size size of target varnode
* @param src size of source varnode
*/
public void emitZeroExtension(String dest, int size, String src) {
Varnode out = findVarnode(dest, size);
Varnode[] in = new Varnode[1];
in[0] = findRegister(src);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_ZEXT, in, out);
opList.add(op);
}
/**
* Appends the pcode truncate src into dest
* @param dest target varnode
* @param size size of target varnode
* @param src size of source varnode
*/
public void emitTruncate(String dest, int size, String src) {
Varnode out = findVarnode(dest, size);
Varnode[] in = new Varnode[2];
in[0] = findRegister(src);
in[1] = getConstant(0, 4);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.SUBPIECE, in, out);
opList.add(op);
}
/**
* Appends the pcode to assign a varnode from a dereference of another varnode
* @param lhs target varnode
* @param size size of pointed-to value
* @param rhs varnode to dereference
*/
public void emitAssignVarnodeFromDereference(String lhs, int size, String rhs) {
Varnode out = findVarnode(lhs, size);
Varnode[] in = new Varnode[2];
in[0] = defSpaceId;
in[1] = findRegister(rhs);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.LOAD, in, out);
opList.add(op);
}
private boolean compareVarnode(Varnode vn1, Varnode vn2, V8_PcodeOpEmitter op2) {
if (vn1 == null) {
return (vn2 == null);
}
if (vn2 == null) {
return false;
}
if (vn1.getSize() != vn2.getSize()) {
return false;
}
AddressSpace spc1 = vn1.getAddress().getAddressSpace();
AddressSpace spc2 = vn2.getAddress().getAddressSpace();
if (spc1 != spc2) {
return false;
}
long offset1 = vn1.getOffset();
long offset2 = vn2.getOffset();
if (offset1 == offset2) {
return true;
}
String name1 = findTempName(vn1.getAddress());
if (name1 == null) {
return false;
}
String name2 = op2.findTempName(vn2.getAddress());
if (name2 == null) {
return false;
}
return name1.equals(name2);
}
@Override
public boolean equals(Object obj) {
V8_PcodeOpEmitter op2 = (V8_PcodeOpEmitter) obj;
if (opList.size() != op2.opList.size()) {
return false;
}
for (int i = 0; i < opList.size(); ++i) {
PcodeOp aop = opList.get(i);
PcodeOp bop = op2.opList.get(i);
if (aop.getOpcode() != bop.getOpcode()) {
return false;
}
if (aop.getNumInputs() != bop.getNumInputs()) {
return false;
}
if (!compareVarnode(aop.getOutput(), bop.getOutput(), op2)) {
return false;
}
for (int j = 0; j < aop.getNumInputs(); ++j) {
if (!compareVarnode(aop.getInput(j), bop.getInput(j), op2)) {
return false;
}
}
}
return true;
}
public void emitAssignVarnodeFromVarnode(String varnodeOutName, String varnodeInName, int size) {
Varnode out = findVarnode(varnodeOutName, size);
Varnode[] in = new Varnode[1];
in[0] = findVarnode(varnodeInName, size);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.COPY, in, out);
opList.add(op);
}
public void emitVarnodeCall(String target, int size) {
Varnode[] in = new Varnode[1];
in[0] = findVarnode(target, size);
PcodeOp op = new PcodeOp(opAddress, seqnum++, PcodeOp.CALLIND, in);
opList.add(op);
}
public void emitConditionalBranchVarnode(Address instructionAddr, int condition, int size, String registerName) {
//check condition
PcodeOp op = null;
Varnode compareRes = findVarnode("tmp_comp_out", size);
Varnode[] in = new Varnode[2];
in[0] = accVarnode;
in[1] = findRegister(registerName);
if (condition == 1) {
op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_EQUAL, in, compareRes);
}
else {
op = new PcodeOp(opAddress, seqnum++, PcodeOp.INT_NOTEQUAL, in, compareRes);
}
opList.add(op);
in = new Varnode[2];
//inputs
in[1] = compareRes;
in[0] = new Varnode(instructionAddr, size);
// go!
op = new PcodeOp(opAddress, seqnum++, PcodeOp.CBRANCH, in);
opList.add(op);
}
}