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Attempt to catch illegal accesses ahead of time.

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This commit is contained in:
Thomas Harte 2023-10-08 15:44:11 -04:00
parent 0d2af80f7f
commit 6808f2c778
1 changed files with 10 additions and 1 deletions
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11
OSBindings/Mac/Clock SignalTests/8088Tests.mm
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@ -95,6 +95,7 @@ struct Registers {
};
struct Memory {
enum class Tag {
Seeded,
Accessed,
FlagsL,
FlagsH
@ -112,6 +113,11 @@ struct Memory {
tags.clear();
}
void seed(uint32_t address, uint8_t value) {
memory[address] = value;
tags[address] = Tag::Seeded;
}
// 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) {
@ -136,6 +142,9 @@ 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(tags.find(address) == tags.end()) {
printf("Access to uninitialised RAM area");
}
return access<IntT>(segment, address, Tag::Accessed);
}
};
@ -399,7 +408,7 @@ struct FailedExecution {
NSDictionary *const initial_state = test[@"initial"];
InstructionSet::x86::Status initial_status;
for(NSArray<NSNumber *> *ram in initial_state[@"ram"]) {
execution_support.memory.memory[[ram[0] intValue]] = [ram[1] intValue];
execution_support.memory.seed([ram[0] intValue], [ram[1] intValue]);
}
[self populate:execution_support.registers status:initial_status value:initial_state[@"regs"]];
execution_support.status = initial_status;