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Handle segment-boundary word accesses.

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With all ADDs and ADCs enabled, no remaining failures.
This commit is contained in:
Thomas Harte 2023-10-08 22:11:05 -04:00
parent bd0b62232f
commit e3b18708c7
2 changed files with 42 additions and 11 deletions
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4
InstructionSets/x86/Implementation/PerformImplementation.hpp
View File

@ -371,9 +371,7 @@ template <
}
// Write to memory if required to complete this operation.
// if(original_data != fetched_data) {
// TODO.
// }
memory.template write_back<IntT>();
}
template <

49
OSBindings/Mac/Clock SignalTests/8088Tests.mm
View File

@ -123,9 +123,7 @@ struct Memory {
tags[address] = Tag::AccessExpected;
}
// Entry point used by the flow controller so that it can mark up locations at which the flags were written,
// so that defined-flag-only masks can be applied while verifying RAM contents.
template <typename IntT> IntT &access([[maybe_unused]] InstructionSet::x86::Source segment, uint16_t address, Tag tag) {
uint32_t segment_base(InstructionSet::x86::Source segment) {
uint32_t physical_address;
using Source = InstructionSet::x86::Source;
switch(segment) {
@ -134,7 +132,13 @@ struct Memory {
case Source::CS: physical_address = registers_.cs_; break;
case Source::SS: physical_address = registers_.ss_; break;
}
physical_address = ((physical_address << 4) + address) & 0xf'ffff;
return physical_address << 4;
}
// Entry point used by the flow controller so that it can mark up locations at which the flags were written,
// so that defined-flag-only masks can be applied while verifying RAM contents.
template <typename IntT> IntT &access(InstructionSet::x86::Source segment, uint16_t address, Tag tag) {
const uint32_t physical_address = (segment_base(segment) + address) & 0xf'ffff;
return access<IntT>(physical_address, tag);
}
@ -150,8 +154,32 @@ struct Memory {
// Entry point for the 8086; simply notes that memory was accessed.
template <typename IntT> IntT &access([[maybe_unused]] InstructionSet::x86::Source segment, uint32_t address) {
if constexpr (std::is_same_v<IntT, uint16_t>) {
// If this is a 16-bit access that runs past the end of the segment, it'll wrap back
// to the start. So the 16-bit value will need to be a local cache.
if(address == 0xffff) {
write_back_address_ = (segment_base(segment) + address) & 0xf'ffff;
write_back_value_ = memory[write_back_address_] | (memory[write_back_address_ - 65535] << 8);
return write_back_value_;
}
}
return access<IntT>(segment, address, Tag::Accessed);
}
template <typename IntT>
void write_back() {
if constexpr (std::is_same_v<IntT, uint16_t>) {
if(write_back_address_) {
memory[write_back_address_] = write_back_value_ & 0xff;
memory[write_back_address_ - 65535] = write_back_value_ >> 8;
write_back_address_ = 0;
}
}
}
static constexpr uint32_t NoWriteBack = 0; // Zero can never be an address that triggers write back, conveniently.
uint32_t write_back_address_ = NoWriteBack;
uint16_t write_back_value_;
};
struct IO {
};
@ -235,11 +263,11 @@ struct FailedExecution {
NSSet *allowList = [NSSet setWithArray:@[
// ADC
@"10.json.gz", @"11.json.gz", @"12.json.gz", @"13.json.gz", @"14.json.gz", @"15.json.gz",
// TO add: 80/2, 81/2, 83/2
@"80.2.json.gz", @"81.2.json.gz", @"83.2.json.gz",
// ADD
@"00.json.gz", //@"01.json.gz", @"02.json.gz", @"03.json.gz", @"04.json.gz", @"05.json.gz",
// TO add: 80/0, 81/0, 83/0
@"00.json.gz", @"01.json.gz", @"02.json.gz", @"03.json.gz", @"04.json.gz", @"05.json.gz",
@"80.0.json.gz", @"81.0.json.gz", @"83.0.json.gz",
// @"37.json.gz", // AAA
// @"3F.json.gz", // AAS
@ -522,12 +550,17 @@ struct FailedExecution {
NSDictionary *metadata = [self metadata];
for(NSString *file in [self testFiles]) {
// Determine what the metadata key.
// Determine the metadata key.
NSString *const name = [file lastPathComponent];
NSRange first_dot = [name rangeOfString:@"."];
NSString *metadata_key = [name substringToIndex:first_dot.location];
// Grab the metadata. If it wants a reg field, inspect a little further.
NSDictionary *test_metadata = metadata[metadata_key];
if(test_metadata[@"reg"]) {
test_metadata = test_metadata[@"reg"][[NSString stringWithFormat:@"%c", [name characterAtIndex:first_dot.location+1]]];
}
for(NSDictionary *test in [self testsInFile:file]) {
[self applyExecutionTest:test file:file metadata:test_metadata];
}