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Document exceptions, partly for my future self.

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Thomas Harte 2024-02-28 14:34:01 -05:00
parent 4d400c3cb7
commit 3368bdb99f
1 changed files with 10 additions and 0 deletions
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10
InstructionSets/ARM/Registers.hpp
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@ -106,13 +106,23 @@ struct Registers {
// MARK: - Exceptions.
enum class Exception {
/// Reset line went from high to low.
Reset = 0x00,
/// Either an undefined instruction or a coprocessor instruction for which no coprocessor was found.
UndefinedInstruction = 0x04,
/// Code executed a software interrupt.
SoftwareInterrupt = 0x08,
/// The memory subsystem indicated an abort during prefetch and that instruction has now come to the head of the queue.
PrefetchAbort = 0x0c,
/// The memory subsystem indicated an abort during an instruction; if it is an LDR or STR then this should be signalled
/// before any instruction execution. If it was an LDM then loading stops upon a data abort but both an LDM and STM
/// otherwise complete, including pointer writeback.
DataAbort = 0x10,
/// The first data transfer attempted within an instruction was above address 0x3ff'ffff.
Address = 0x14,
/// The IRQ line was low at the end of an instruction and ConditionCode::IRQDisable was not set.
IRQ = 0x18,
/// The FIQ went low at least one cycle ago and ConditionCode::FIQDisable was not set.
FIQ = 0x1c,
};