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Add special case for shifts and rolls.

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This commit is contained in:
Thomas Harte 2023-09-27 11:10:21 -04:00
parent b59eae3676
commit 638f3d3a53
1 changed files with 33 additions and 1 deletions
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34
OSBindings/Mac/Clock SignalTests/8088Tests.mm
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@ -176,8 +176,9 @@ std::string to_string(InstructionSet::x86::DataPointer pointer, const Instructio
// Form string version, compare. // Form string version, compare.
std::string operation; std::string operation;
using Operation = InstructionSet::x86::Operation; using Operation = InstructionSet::x86::Operation;
using Repetition = InstructionSet::x86::Repetition; using Repetition = InstructionSet::x86::Repetition;
using Source = InstructionSet::x86::Source;
switch(instruction.repetition()) { switch(instruction.repetition()) {
case Repetition::None: break; case Repetition::None: break;
case Repetition::RepE: case Repetition::RepE:
@ -221,6 +222,37 @@ std::string to_string(InstructionSet::x86::DataPointer pointer, const Instructio
operation += ":0x"; operation += ":0x";
operation += to_hex(instruction.offset(), 4, false); operation += to_hex(instruction.offset(), 4, false);
} break; } break;
// Rolls and shifts list eCX as a source on the understanding that everyone knows that rolls and shifts
// use CL even when they're shifting or rolling a word-sized quantity.
case Operation::RCL: case Operation::RCR:
case Operation::ROL: case Operation::ROR:
case Operation::SAL: case Operation::SAR:
case Operation::SHR:
const int operands = num_operands(instruction.operation);
const bool displacement = has_displacement(instruction.operation);
operation += " ";
if(operands > 1) {
operation += to_string(instruction.destination(), instruction, offsetLength);
}
if(operands > 0) {
switch(instruction.source().source()) {
case Source::eCX: operation += ", cl"; break;
case Source::Immediate:
// Providing an immediate operand of 1 is a little future-proofing by the decoder; the '1'
// is actually implicit on a real 8088. So omit it.
if(instruction.operand() == 1) break;
[[fallthrough]];
default:
operation += ", ";
operation += to_string(instruction.source(), instruction, offsetLength);
break;
}
}
if(displacement) {
operation += to_hex(instruction.displacement(), 2);
}
break;
} }
return [NSString stringWithUTF8String:operation.c_str()]; return [NSString stringWithUTF8String:operation.c_str()];