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// Copyright (c) 2025 taitep
// SPDX-License-Identifier: BSD-2-Clause
//
// This file is part of TRVE (https://gitea.taitep.se/taitep/trve)
// See LICENSE file in the project root for full license text.
use int_enum::IntEnum;
#[repr(u8)]
#[allow(dead_code)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, IntEnum)]
pub enum ExceptionType {
InstructionAddressMisaligned = 0,
InstructionAccessFault = 1,
IllegalInstruction = 2,
Breakpoint = 3,
LoadAddressMisaligned = 4,
LoadAccessFault = 5,
StoreAmoAddressMisaligned = 6,
StoreAmoAccessFault = 7,
EnvironmentCallFromUMode = 8,
EnvironmentCallFromSMode = 9,
EnvironmentCallFromMMode = 11,
InstructionPageFault = 12,
LoadPageFault = 13,
StoreAmoPageFault = 15,
DoubleTrap = 16,
SoftwareCheck = 18,
HardwareError = 19,
}
impl ExceptionType {
pub fn with_no_value(self) -> Exception {
Exception {
type_: self,
value: 0,
}
}
}
#[derive(Debug, Clone, Copy)]
pub struct Exception {
pub type_: ExceptionType,
pub value: u64,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum MemoryExceptionType {
AddressMisaligned,
AccessFault,
PageFault,
}
impl MemoryExceptionType {
pub(crate) fn with_addr(self, addr: u64) -> MemoryException {
MemoryException { type_: self, addr }
}
}
#[derive(Debug, Clone, Copy)]
pub struct MemoryException {
pub type_: MemoryExceptionType,
pub addr: u64,
}
impl MemoryException {
pub(crate) fn into_exception_store(self) -> Exception {
Exception {
type_: match self.type_ {
MemoryExceptionType::AddressMisaligned => ExceptionType::StoreAmoAddressMisaligned,
MemoryExceptionType::AccessFault => ExceptionType::StoreAmoAccessFault,
MemoryExceptionType::PageFault => ExceptionType::StoreAmoPageFault,
},
value: self.addr,
}
}
pub(crate) fn into_exception_instr(self) -> Exception {
Exception {
type_: match self.type_ {
MemoryExceptionType::AddressMisaligned => ExceptionType::InstructionAccessFault,
MemoryExceptionType::AccessFault => ExceptionType::InstructionAccessFault,
MemoryExceptionType::PageFault => ExceptionType::InstructionPageFault,
},
value: self.addr,
}
}
pub(crate) fn into_exception_load(self) -> Exception {
Exception {
type_: match self.type_ {
MemoryExceptionType::AddressMisaligned => ExceptionType::LoadAddressMisaligned,
MemoryExceptionType::AccessFault => ExceptionType::LoadAccessFault,
MemoryExceptionType::PageFault => ExceptionType::LoadPageFault,
},
value: self.addr,
}
}
}
impl From<MemoryException> for MemoryExceptionType {
fn from(val: MemoryException) -> Self {
val.type_
}
}
impl From<Exception> for ExceptionType {
fn from(val: Exception) -> Self {
val.type_
}
}
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