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David Brazdil66fc1202022-07-04 21:48:45 +01001// 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
Alice Wangf1d5efd2023-07-04 15:07:59 +000017use vmbase::{
18 console::emergency_write_str,
19 eprintln,
20 exceptions::{ArmException, Esr, HandleExceptionError},
21 logger,
22 memory::{handle_permission_fault, handle_translation_fault},
23 power::reboot,
24 read_sysreg,
25};
26
27fn handle_exception(exception: &ArmException) -> Result<(), HandleExceptionError> {
28 // Handle all translation faults on both read and write, and MMIO guard map
29 // flagged invalid pages or blocks that caused the exception.
30 // Handle permission faults for DBM flagged entries, and flag them as dirty on write.
31 match exception.esr {
32 Esr::DataAbortTranslationFault => handle_translation_fault(exception.far),
33 Esr::DataAbortPermissionFault => handle_permission_fault(exception.far),
34 _ => Err(HandleExceptionError::UnknownException),
35 }
36}
David Brazdil66fc1202022-07-04 21:48:45 +010037
38#[no_mangle]
Alice Wangf1d5efd2023-07-04 15:07:59 +000039extern "C" fn sync_exception_current(elr: u64, _spsr: u64) {
40 // Disable logging in exception handler to prevent unsafe writes to UART.
41 let _guard = logger::suppress();
42
43 let exception = ArmException::from_el1_regs();
44 if let Err(e) = handle_exception(&exception) {
45 exception.print("sync_exception_current", e, elr);
46 reboot()
47 }
David Brazdil66fc1202022-07-04 21:48:45 +010048}
49
50#[no_mangle]
51extern "C" fn irq_current() {
52 emergency_write_str("irq_current\n");
53 reboot();
54}
55
56#[no_mangle]
57extern "C" fn fiq_current() {
58 emergency_write_str("fiq_current\n");
59 reboot();
60}
61
62#[no_mangle]
63extern "C" fn serr_current() {
64 emergency_write_str("serr_current\n");
65 print_esr();
66 reboot();
67}
68
69#[no_mangle]
70extern "C" fn sync_lower() {
71 emergency_write_str("sync_lower\n");
72 print_esr();
73 reboot();
74}
75
76#[no_mangle]
77extern "C" fn irq_lower() {
78 emergency_write_str("irq_lower\n");
79 reboot();
80}
81
82#[no_mangle]
83extern "C" fn fiq_lower() {
84 emergency_write_str("fiq_lower\n");
85 reboot();
86}
87
88#[no_mangle]
89extern "C" fn serr_lower() {
90 emergency_write_str("serr_lower\n");
91 print_esr();
92 reboot();
93}
94
95#[inline]
96fn print_esr() {
Pierre-Clément Tosi9a7328e2023-07-07 15:51:51 +000097 let esr = read_sysreg!("esr_el1");
David Brazdil66fc1202022-07-04 21:48:45 +010098 eprintln!("esr={:#08x}", esr);
99}