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Correct data size when accessing address registers.

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This commit is contained in:
Thomas Harte 2022-02-27 19:45:03 -05:00
parent 84ac68a58b
commit 9f12c009d6
3 changed files with 16 additions and 11 deletions
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24
InstructionSets/x86/DataPointerResolver.hpp
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@ -82,13 +82,13 @@ template <Model model, typename RegistersT, typename MemoryT> class DataPointerR
DataT &value) {
const Source source = pointer.source();
#define read_or_write(v, x, allow_write) \
case Source::x: \
if constexpr(allow_write && is_write) {\
registers.template write<DataT, register_for_source<DataT>(Source::x)>(v); \
} else { \
value = registers.template read<DataT, register_for_source<DataT>(Source::x)>(); \
} \
#define read_or_write(v, x, allow_write) \
case Source::x: \
if constexpr(allow_write && is_write) { \
registers.template write<decltype(v), register_for_source<decltype(v)>(Source::x)>(v); \
} else { \
v = registers.template read<decltype(v), register_for_source<decltype(v)>(Source::x)>(); \
} \
break;
#define ALLREGS(v) f(v, eAX); f(v, eCX); f(v, eDX); f(v, eBX); \
@ -118,7 +118,8 @@ template <Model model, typename RegistersT, typename MemoryT> class DataPointerR
break;
case Source::Indirect: {
uint32_t base = 0, index = 0;
using AddressT = typename Instruction<is_32bit(model)>::AddressComponentT;
AddressT base = 0, index = 0;
#define f(x, y) read_or_write(x, y, false)
switch(pointer.base()) {
@ -132,14 +133,17 @@ template <Model model, typename RegistersT, typename MemoryT> class DataPointerR
}
#undef f
// Compute address as 32-bit; its always at least 20 bits
// and at most 32.
uint32_t address = index;
if constexpr (model >= Model::i80386) {
index <<= pointer.scale();
address <<= pointer.scale();
} else {
assert(!pointer.scale());
}
// TODO: verify application of memory_mask here.
const uint32_t address = (base & memory_mask) + (index & memory_mask);
address = (address & memory_mask) + (base & memory_mask);
if constexpr (is_write) {
value = memory.template read<DataT>(

1
InstructionSets/x86/Instruction.hpp
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@ -511,6 +511,7 @@ template<bool is_32bit> class Instruction {
using DisplacementT = typename std::conditional<is_32bit, int32_t, int16_t>::type;
using ImmediateT = typename std::conditional<is_32bit, uint32_t, uint16_t>::type;
using AddressComponentT = ImmediateT;
/* Note to self — current thinking is:

2
OSBindings/Mac/Clock SignalTests/x86DataPointerTests.mm
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@ -49,7 +49,7 @@ using namespace InstructionSet::x86;
template<typename DataT> DataT read(Source segment, uint32_t address) {
(void)segment;
(void)address;
printf("Access at %d\n", address);
printf("Access at %08x\n", address);
return 0;
}
template<typename DataT> void write(Source, uint32_t, DataT) {