1 // Copyright 2022, The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 //! Exception handlers.
16
17 use vmbase::{
18 arch::aarch64::exceptions::{
19 handle_permission_fault, handle_translation_fault, ArmException, Esr, HandleExceptionError,
20 },
21 logger, read_sysreg,
22 };
23
handle_exception(exception: &ArmException) -> Result<(), HandleExceptionError>24 fn handle_exception(exception: &ArmException) -> Result<(), HandleExceptionError> {
25 // Handle all translation faults on both read and write, and MMIO guard map
26 // flagged invalid pages or blocks that caused the exception.
27 // Handle permission faults for DBM flagged entries, and flag them as dirty on write.
28 match exception.esr {
29 Esr::DataAbortTranslationFault => handle_translation_fault(exception.far),
30 Esr::DataAbortPermissionFault => handle_permission_fault(exception.far),
31 _ => Err(HandleExceptionError::UnknownException),
32 }
33 }
34
35 #[no_mangle]
sync_exception_current(elr: u64, _spsr: u64)36 extern "C" fn sync_exception_current(elr: u64, _spsr: u64) {
37 // Disable logging in exception handler to prevent unsafe writes to UART.
38 let _guard = logger::suppress();
39
40 let exception = ArmException::from_el1_regs();
41 if let Err(e) = handle_exception(&exception) {
42 exception.print_and_reboot("sync_exception_current", e, elr);
43 }
44 }
45
46 #[no_mangle]
irq_current(_elr: u64, _spsr: u64)47 extern "C" fn irq_current(_elr: u64, _spsr: u64) {
48 panic!("irq_current");
49 }
50
51 #[no_mangle]
fiq_current(_elr: u64, _spsr: u64)52 extern "C" fn fiq_current(_elr: u64, _spsr: u64) {
53 panic!("fiq_current");
54 }
55
56 #[no_mangle]
serr_current(_elr: u64, _spsr: u64)57 extern "C" fn serr_current(_elr: u64, _spsr: u64) {
58 let esr = read_sysreg!("esr_el1");
59 panic!("serr_current, esr={esr:#08x}");
60 }
61
62 #[no_mangle]
sync_lower(_elr: u64, _spsr: u64)63 extern "C" fn sync_lower(_elr: u64, _spsr: u64) {
64 let esr = read_sysreg!("esr_el1");
65 panic!("sync_lower, esr={esr:#08x}");
66 }
67
68 #[no_mangle]
irq_lower(_elr: u64, _spsr: u64)69 extern "C" fn irq_lower(_elr: u64, _spsr: u64) {
70 panic!("irq_lower");
71 }
72
73 #[no_mangle]
fiq_lower(_elr: u64, _spsr: u64)74 extern "C" fn fiq_lower(_elr: u64, _spsr: u64) {
75 panic!("fiq_lower");
76 }
77
78 #[no_mangle]
serr_lower(_elr: u64, _spsr: u64)79 extern "C" fn serr_lower(_elr: u64, _spsr: u64) {
80 let esr = read_sysreg!("esr_el1");
81 panic!("serr_lower, esr={esr:#08x}");
82 }
83