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exo: implement start of mariko fatal handler

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Michael Scire 2020-11-15 12:58:13 -08:00 • committed by SciresM
parent 123ed80dc7
commit 7bcd5c6e3b
28 changed files with 1138 additions and 24 deletions
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96
exosphere/program/source/secmon_exception_handler.cpp Normal file
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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <exosphere.hpp>
#include "secmon_error.hpp"
namespace ams::secmon {
namespace {
constexpr inline uintptr_t PMC = MemoryRegionVirtualDevicePmc.GetAddress();
constinit std::atomic_bool g_is_locked = false;
}
void ExceptionHandlerImpl(uintptr_t lr, uintptr_t sp) {
/* Ensure that previous logs have been flushed. */
AMS_LOG_FLUSH();
/* Get system registers. */
uintptr_t far_el1, far_el3, elr_el3;
util::BitPack32 esr_el3;
HW_CPU_GET_FAR_EL1(far_el1);
HW_CPU_GET_FAR_EL3(far_el3);
HW_CPU_GET_ELR_EL3(elr_el3);
HW_CPU_GET_ESR_EL3(esr_el3);
/* Print some whitespace before the exception handler. */
AMS_LOG("\n\n");
AMS_SECMON_LOG("ExceptionHandler\n");
AMS_SECMON_LOG("----------------\n");
AMS_SECMON_LOG("esr: 0x%08X\n", esr_el3.value);
AMS_SECMON_LOG(" Exception Class: 0x%02X\n", esr_el3.Get<hw::EsrEl3::Ec>());
AMS_SECMON_LOG(" Instruction Length: %d\n", esr_el3.Get<hw::EsrEl3::Il>() ? 32 : 16);
AMS_SECMON_LOG(" Instruction Specific Syndrome: 0x%07X\n", esr_el3.Get<hw::EsrEl3::Iss>());
AMS_SECMON_LOG("far_el1: 0x%016lX\n", far_el1);
AMS_SECMON_LOG("far_el3: 0x%016lX\n", far_el3);
AMS_SECMON_LOG("elr_el3: 0x%016lX\n", elr_el3);
AMS_SECMON_LOG("lr: 0x%016lX\n", lr);
AMS_SECMON_LOG("sp: 0x%016lX\n", sp);
AMS_DUMP(reinterpret_cast<void *>(sp), util::AlignUp(sp, mmu::PageSize) - sp);
AMS_LOG_FLUSH();
}
NORETURN void ExceptionHandler() {
/* Get link register and stack pointer. */
u64 lr, sp;
{
__asm__ __volatile__("mov %0, lr" : "=r"(lr) :: "memory");
__asm__ __volatile__("mov %0, sp" : "=r"(sp) :: "memory");
}
/* Acquire exclusive access to exception handling logic. */
if (g_is_locked.exchange(true)) {
/* Invoke the exception handler impl. */
ExceptionHandlerImpl(lr, sp);
/* Lockout the security engine. */
se::Lockout();
/* Lockout fuses. */
fuse::Lockout();
/* Disable crypto operations after reboot. */
reg::Write(PMC + APBDEV_PMC_CRYPTO_OP, 0);
/* Perform an error reboot. */
secmon::SetError(pkg1::ErrorInfo_UnknownAbort);
secmon::ErrorReboot();
} else {
/* Wait forever while the first core prints the exception and reboots. */
while (true) {
util::WaitMicroSeconds(1000);
}
}
}
}