Implement BOUND.

InstructionSets/x86/Implementation/FlowControl.hpp

@@ -213,7 +213,27 @@ void into(
 	ContextT &context
 ) {
 	if(context.flags.template flag<Flag::Overflow>()) {
-		interrupt(Interrupt::OnOverflow, context);
+		interrupt(Interrupt::Overflow, context);
+	}
+}
+
+template <typename IntT, typename InstructionT, typename ContextT>
+void bound(
+	const InstructionT &instruction,
+	read_t<IntT> destination,
+	read_t<IntT> source,
+	ContextT &context
+) {
+	using sIntT = typename std::make_signed<IntT>::type;
+
+	const auto source_segment = instruction.data_segment();
+	context.memory.preauthorise_read(source_segment, source, 2*sizeof(IntT));
+	const sIntT lower_bound = sIntT(context.memory.template access<uint16_t, AccessType::PreauthorisedRead>(source_segment, source));
+	source += 2;
+	const sIntT upper_bound = sIntT(context.memory.template access<uint16_t, AccessType::PreauthorisedRead>(source_segment, source));
+
+	if(sIntT(destination) < lower_bound || sIntT(destination) > upper_bound) {
+		interrupt(Interrupt::BoundRangeExceeded, context);
 	}
 }
 

InstructionSets/x86/Implementation/PerformImplementation.hpp

@@ -328,8 +328,8 @@ template <
 				}
 				break;
 			} else {
-				// TODO: perform BOUND as of the 80186.
 				static_assert(int(Operation::SETMOC) == int(Operation::BOUND));
+				Primitive::bound<IntT>(instruction, destination_r(), source_r(), context);
 			}
 		return;
 

InstructionSets/x86/Interrupts.hpp

@@ -12,11 +12,26 @@
 namespace InstructionSet::x86 {
 
 enum Interrupt {
-	DivideError		= 0,
-	SingleStep		= 1,
-	NMI				= 2,
-	OneByte			= 3,
-	OnOverflow		= 4,
+	DivideError					= 0,
+	SingleStep					= 1,
+	NMI							= 2,
+	Breakpoint					= 3,
+	Overflow					= 4,
+	BoundRangeExceeded			= 5,
+	InvalidOpcode				= 6,
+	DeviceNotAvailable			= 7,
+	DoubleFault					= 8,
+	CoprocessorSegmentOverrun	= 9,
+	InvalidTSS					= 10,
+	SegmentNotPresent			= 11,
+	StackSegmentFault			= 12,
+	GeneralProtectionFault		= 13,
+	PageFault					= 14,
+	/* 15 is reserved */
+	FloatingPointException		= 16,
+	AlignmentCheck				= 17,
+	MachineCheck				= 18,
+
 };
 
 }