General updates and bugfixes

CHANGELOG.md

@@ -2,6 +2,11 @@
 All notable changes to this project will be documented in this file.
 
 
+## [Unreleased]
+- Fixed emulation of floating point opcodes.
+- Fixed bug in Ghidra plugin setup handling.
+
+
 ## [0.7.0] - 2023-01-26
 - Add `movsq` opcode support (@ddash-ct)
 - Added utility functions for analyzing strings:

rugosa/emulation/variables.py

@@ -48,7 +48,7 @@ def __getitem__(self, addr_or_name) -> "Variable":
         elif isinstance(addr_or_name, int):
             return self._variables[addr_or_name]
         else:
-            raise ValueError("Invalid variable name or address: {!r}".format(addr_or_name))
+            raise KeyError(f"Invalid variable name or address: {addr_or_name!r}")
 
     def __len__(self):
         return len(self._variables)
@@ -91,7 +91,8 @@ def __contains__(self, addr_or_name) -> bool:
             addr = addr_or_name
             return addr in self._variables
         else:
-            raise ValueError("Invalid variable name or address: {!r}".format(addr_or_name))
+            # We could have floats or None checked if dealing with a FPU register.
+            return False
 
     def __iter__(self) -> Iterable["Variable"]:
         return iter(self._variables.values())

rugosa/emulation/x86_64/fpu_opcodes.py

@@ -244,7 +244,7 @@ def FLD(cpu_context: ProcessorContext, instruction: Instruction):
     mnem = instruction.mnem
     operands = instruction.operands
 
-    value = orig_value = operands[0].value if operands else None
+    value = orig_value = operands[-1].value if operands else None
     if mnem == "fld":
         value = utils.int_to_float(value)
     elif mnem == "fild":
@@ -300,8 +300,8 @@ def FST(cpu_context: ProcessorContext, instruction: Instruction):
         value = int(value)
     else:
         value = utils.float_to_int(value)
-    operands[0].value = value
-    logger.debug("Storing: %f -> %d -> %s", orig_value, value, operands[0].text)
+    operands[-1].value = value
+    logger.debug("Storing: %f -> %d -> %s", orig_value, value, operands[-1].text)
     if mnem.endswith("p"):
         cpu_context.registers.fpu.pop()
 
@@ -363,8 +363,8 @@ def FXCH(cpu_context: ProcessorContext, instruction: Instruction):
         st0 = 0.0
 
     if operands:
-        opvalue = operands[0].value
-        cpu_context.registers.st0, operands[0].value = opvalue, st0
+        opvalue = operands[-1].value
+        cpu_context.registers.st0, operands[-1].value = opvalue, st0
         logger.debug("exchange %f <-> %f", st0, opvalue)
     else:
         st1 = cpu_context.registers.st1

rugosa/ghidra_plugin/install.py

@@ -11,15 +11,14 @@ def setup(launcher):
     """
     Run by pyhidra launcher to install our plugin.
     """
-    if isinstance(launcher, pyhidra.GuiPyhidraLauncher):
-        source_path = Path(__file__).parent / "java" / "plugin"
-        details = pyhidra.ExtensionDetails(
-            name="rugosa",
-            description="Rugosa Emulator Plugin",
-            author="Department of Defence Cyber Crime Center (DC3)",
-            plugin_version=__version__,
-        )
-        launcher.install_plugin(source_path, details)
+    source_path = Path(__file__).parent / "java" / "plugin"
+    details = pyhidra.ExtensionDetails(
+        name="rugosa",
+        description="Rugosa Emulator Plugin",
+        author="Department of Defence Cyber Crime Center (DC3)",
+        plugin_version=__version__,
+    )
+    launcher.install_plugin(source_path, details)
 
 
 def pre_launch():