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Merge remote-tracking branch 'origin/patch'

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ghidra1
2023-02-03 18:16:17 -05:00
parent 7143f64c51 fb42de7176
commit 8f5ebf122e
1 changed files with 37 additions and 7 deletions
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Ghidra/Features/Base/src/main/java/ghidra/program/util/VarnodeContext.java
+37 -7
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@@ -38,8 +38,6 @@ import ghidra.util.exception.*;
public class VarnodeContext implements ProcessorContext {
public Address BAD_ADDRESS = null;
public static final int BAD_SPACE_ID_VALUE = 0xffff;
protected DisassemblerContextImpl offsetContext;
@@ -71,6 +69,10 @@ public class VarnodeContext implements ProcessorContext {
protected static final NotFoundException notFoundExc = new NotFoundException();
public final Address BAD_ADDRESS;
private final int BAD_OFFSET_SPACEID; // address space for offsets from an unknown value;
protected boolean hitDest = false;
protected AddressFactory addrFactory = null;
@@ -90,6 +92,8 @@ public class VarnodeContext implements ProcessorContext {
this.addrFactory = new OffsetAddressFactory(program);
BAD_ADDRESS = addrFactory.getAddress(getAddressSpace("BAD_ADDRESS_SPACE"), 0);
BAD_OFFSET_SPACEID = getAddressSpace("(Bad Address Offset)");
this.programContext = programContext;
@@ -683,7 +687,8 @@ public class VarnodeContext implements ProcessorContext {
return;
}
if (out.isAddress() || isSymbolicSpace(out.getSpace())) {
boolean isSymbolicAddr = isSymbolicSpace(out.getSpace());
if (out.isAddress() || isSymbolicAddr) {
if (!isRegister(out)) {
if (debug) {
Msg.info(this, " " + print(out) + " <- " + print(result) + " at " +
@@ -1002,11 +1007,28 @@ public class VarnodeContext implements ProcessorContext {
return rvnode.toString();
}
// TODO: these are vague. Should they be using context?
/**
* Get the current value of the register at the address
*
* @param reg value of register to get
* @param toAddr value of register at a location
*
* @return value of register or null
*/
public RegisterValue getRegisterValue(Register reg, Address toAddr) {
return getRegisterValue(reg, Address.NO_ADDRESS, toAddr);
}
/**
* Get the value of a register that was set coming from an address to an
* another address.
*
* @param reg value of register to get
* @param fromAddr location the value came from
* @param toAddr location to get the value of the register coming from fromAddr
*
* @return value of register or null
*/
public RegisterValue getRegisterValue(Register reg, Address fromAddr, Address toAddr) {
// only return constants
RegisterValue regVal = offsetContext.getRegisterValue(reg, fromAddr, toAddr);
@@ -1105,8 +1127,9 @@ public class VarnodeContext implements ProcessorContext {
}
}
else if (val1.getAddress() == BAD_ADDRESS) {
// FIXME: Why both a "(bad address)" space and a "BAD_ADDRESS_SPACE" ?
spaceID = getAddressSpace("(bad address)");
// use bad address offset space, allows offsets to unknown things to continue
// TODO: Investigate if the source of the BAD_ADDRESS can be known
spaceID = BAD_OFFSET_SPACEID;
valbase = 0;
// check if evaluator wants to override unknown
Instruction instr = getCurrentInstruction(offsetContext.getAddress());
@@ -1163,6 +1186,9 @@ public class VarnodeContext implements ProcessorContext {
else {
throw notFoundExc;
}
// create a new varnode with the correct space and offset
// note: if spaceID is a bad space, createVarnode will create a new BAD_ADDRESS
long result = (valbase + getConstant(val2, null)) &
(0xffffffffffffffffL >>> ((8 - val1.getSize()) * 8));
return createVarnode(result, spaceID, val1.getSize());
@@ -1224,6 +1250,7 @@ public class VarnodeContext implements ProcessorContext {
val2 = swap;
}
long val2Const = getConstant(val2, null);
// got a constant from val2, (value | 0) == value, so just return value
if (val2Const == 0) {
return val1;
}
@@ -1272,7 +1299,10 @@ public class VarnodeContext implements ProcessorContext {
throws NotFoundException {
// degenerate case, don't need to know the value
if (val1.equals(val2)) {
return createVarnode(0, addrFactory.getConstantSpace().getSpaceID(), val1.getSize());
if (val1.getAddress().equals(BAD_ADDRESS)) {
return val1;
}
return createVarnode(0, addrFactory.getConstantSpace().getSpaceID(), val1.getSize());
}
int spaceID = val1.getSpace();
long valbase = 0;