hyperlight_common/
outb.rs

1/*
2Copyright 2025 The Hyperlight Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8    http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17use core::convert::TryFrom;
18
19use anyhow::{Error, anyhow};
20
21/// Exception codes for the x86 architecture.
22/// These are helpful to identify the type of exception that occurred
23/// together with OutBAction::Abort.
24#[repr(u8)]
25#[derive(Debug, Clone, Copy)]
26pub enum Exception {
27    DivideByZero = 0,
28    Debug = 1,
29    NonMaskableInterrupt = 2,
30    Breakpoint = 3,
31    Overflow = 4,
32    BoundRangeExceeded = 5,
33    InvalidOpcode = 6,
34    DeviceNotAvailable = 7,
35    DoubleFault = 8,
36    CoprocessorSegmentOverrun = 9,
37    InvalidTSS = 10,
38    SegmentNotPresent = 11,
39    StackSegmentFault = 12,
40    GeneralProtectionFault = 13,
41    PageFault = 14,
42    Reserved = 15,
43    X87FloatingPointException = 16,
44    AlignmentCheck = 17,
45    MachineCheck = 18,
46    SIMDFloatingPointException = 19,
47    VirtualizationException = 20,
48    SecurityException = 30,
49    NoException = 0xFF,
50}
51
52impl TryFrom<u8> for Exception {
53    type Error = Error;
54
55    fn try_from(value: u8) -> Result<Self, Self::Error> {
56        use Exception::*;
57        let exception = match value {
58            0 => DivideByZero,
59            1 => Debug,
60            2 => NonMaskableInterrupt,
61            3 => Breakpoint,
62            4 => Overflow,
63            5 => BoundRangeExceeded,
64            6 => InvalidOpcode,
65            7 => DeviceNotAvailable,
66            8 => DoubleFault,
67            9 => CoprocessorSegmentOverrun,
68            10 => InvalidTSS,
69            11 => SegmentNotPresent,
70            12 => StackSegmentFault,
71            13 => GeneralProtectionFault,
72            14 => PageFault,
73            15 => Reserved,
74            16 => X87FloatingPointException,
75            17 => AlignmentCheck,
76            18 => MachineCheck,
77            19 => SIMDFloatingPointException,
78            20 => VirtualizationException,
79            30 => SecurityException,
80            0x7F => NoException,
81            _ => return Err(anyhow!("Unknown exception code: {:#x}", value)),
82        };
83
84        Ok(exception)
85    }
86}
87
88/// Supported actions when issuing an OUTB actions by Hyperlight.
89/// - Log: for logging,
90/// - CallFunction: makes a call to a host function,
91/// - Abort: aborts the execution of the guest,
92/// - DebugPrint: prints a message to the host
93pub enum OutBAction {
94    Log = 99,
95    CallFunction = 101,
96    Abort = 102,
97    DebugPrint = 103,
98}
99
100impl TryFrom<u16> for OutBAction {
101    type Error = anyhow::Error;
102    fn try_from(val: u16) -> anyhow::Result<Self> {
103        match val {
104            99 => Ok(OutBAction::Log),
105            101 => Ok(OutBAction::CallFunction),
106            102 => Ok(OutBAction::Abort),
107            103 => Ok(OutBAction::DebugPrint),
108            _ => Err(anyhow::anyhow!("Invalid OutBAction value: {}", val)),
109        }
110    }
111}
hyperlight_common/outb.rs

hyperlight_common/
outb.rs
