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Introduces 'far' test, fixes parsing.

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This commit is contained in:
Thomas Harte 2021-01-14 22:15:38 -05:00
parent 2c72a77a25
commit ca94e9038e
3 changed files with 20 additions and 3 deletions
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17
OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm
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@ -95,6 +95,12 @@ namespace {
XCTAssertEqual(instruction.displacement(), 0);
}
- (void)assert:(Instruction &)instruction operation:(Operation)operation segment:(uint16_t)segment offset:(uint16_t)offset {
XCTAssertEqual(instruction.operation, operation);
XCTAssertEqual(instruction.segment(), segment);
XCTAssertEqual(instruction.offset(), offset);
}
// MARK: - Decoder
- (void)decode:(const std::initializer_list<uint8_t> &)stream {
@ -312,12 +318,19 @@ namespace {
0x83, 0x2f, 0x09, // subw $0x9,(%bx)
}];
// 68 instructions are expected.
XCTAssertEqual(instructions.size(), 3);
[self assert:instructions[0] operation:Operation::ADC size:2 source:Source::Immediate destination:Source::IndBXPlusSI operand:0xff80];
[self assert:instructions[1] operation:Operation::CMP size:2 source:Source::Immediate destination:Source::IndBPPlusDI operand:0x4];
[self assert:instructions[2] operation:Operation::SUB size:2 source:Source::Immediate destination:Source::IndBX operand:0x9];
}
- (void)testFar {
[self decode:{
0x9a, 0x12, 0x34, 0x56, 0x78, // lcall 0x7856, 0x3412
}];
XCTAssertEqual(instructions.size(), 1);
[self assert:instructions[0] operation:Operation::CALLF segment:0x7856 offset:0x3412];
}
@end

2
Processors/Decoders/x86/x86.cpp
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@ -585,7 +585,9 @@ std::pair<int, Instruction> Decoder::decode(const uint8_t *source, size_t length
operand_ |= (operand_ & 0x80) ? 0xff00 : 0x0000;
}
break;
case 4: displacement_size_ = 2; [[fallthrough]];
case 2: operand_ = inward_data_ >> 48; inward_data_ <<= 16; break;
break;
}
switch(displacement_size_) {
default: displacement_ = 0; break;

4
Processors/Decoders/x86/x86.hpp
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@ -37,10 +37,11 @@ enum class Operation: uint8_t {
ADD,
/// And; source, destination, operand and displacement will be populated appropriately.
AND,
/// Far call; followed by a 32-bit operand.
/// Far call; see the segment() and offset() fields.
CALLF,
/// Displacement call; followed by a 16-bit operand providing a call offset.
CALLD,
/// Near call.
CALLN,
/// Convert byte into word; source will be AL, destination will be AH.
CBW,
@ -155,6 +156,7 @@ class Instruction {
Size operation_size() const { return Size(repetition_size_ >> 2); }
uint16_t segment() const { return uint16_t(operand_); }
uint16_t offset() const { return uint16_t(displacement_); }
int16_t displacement() const { return displacement_; }
uint16_t operand() const { return operand_; }