mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mesosphere.hpp>
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extern "C" void _start();
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namespace ams::result::impl {
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NORETURN void OnResultAssertion(Result result) {
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MESOSPHERE_PANIC("OnResultAssertion(2%03d-%04d)", result.GetModule(), result.GetDescription());
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}
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}
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namespace ams::kern {
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namespace {
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constexpr std::array<s32, cpu::NumCores> NegativeArray = [] {
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std::array<s32, cpu::NumCores> arr = {};
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for (size_t i = 0; i < arr.size(); i++) {
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arr[i] = -1;
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}
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return arr;
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}();
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std::atomic<s32> g_next_ticket = 0;
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std::atomic<s32> g_current_ticket = 0;
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std::array<s32, cpu::NumCores> g_core_tickets = NegativeArray;
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s32 GetCoreTicket() {
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const s32 core_id = GetCurrentCoreId();
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if (g_core_tickets[core_id] == -1) {
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g_core_tickets[core_id] = 2 * g_next_ticket.fetch_add(1);
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}
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return g_core_tickets[core_id];
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}
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void WaitCoreTicket() {
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const s32 expected = GetCoreTicket();
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const s32 desired = expected + 1;
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s32 compare = g_current_ticket;
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do {
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if (compare == desired) {
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break;
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}
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compare = expected;
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} while (!g_current_ticket.compare_exchange_weak(compare, desired));
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}
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void ReleaseCoreTicket() {
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const s32 expected = GetCoreTicket() + 1;
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const s32 desired = expected + 1;
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s32 compare = g_current_ticket;
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do {
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if (compare != expected) {
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break;
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}
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} while (!g_current_ticket.compare_exchange_weak(compare, desired));
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}
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[[gnu::unused]] void PrintCurrentState() {
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/* Wait for it to be our turn to print. */
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WaitCoreTicket();
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const s32 core_id = GetCurrentCoreId();
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MESOSPHERE_RELEASE_LOG("Core[%d] Current State:\n", core_id);
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/* TODO: Dump register state. */
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#ifdef ATMOSPHERE_ARCH_ARM64
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MESOSPHERE_RELEASE_LOG(" Backtrace:\n");
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uintptr_t fp = reinterpret_cast<uintptr_t>(__builtin_frame_address(0));
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for (size_t i = 0; i < 32 && fp && util::IsAligned(fp, 0x10) && cpu::GetPhysicalAddressWritable(nullptr, fp, true); i++) {
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struct {
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uintptr_t fp;
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uintptr_t lr;
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} *stack_frame = reinterpret_cast<decltype(stack_frame)>(fp);
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MESOSPHERE_RELEASE_LOG(" [%02zx]: %p\n", i, reinterpret_cast<void *>(stack_frame->lr));
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fp = stack_frame->fp;
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}
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#endif
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MESOSPHERE_RELEASE_LOG("\n");
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/* Allow the next core to print. */
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ReleaseCoreTicket();
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}
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NORETURN void StopSystem() {
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#ifdef MESOSPHERE_BUILD_FOR_DEBUGGING
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/* Print the current core. */
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PrintCurrentState();
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#endif
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KSystemControl::StopSystem();
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}
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}
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NORETURN WEAK_SYMBOL void Panic(const char *file, int line, const char *format, ...) {
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#ifdef MESOSPHERE_BUILD_FOR_DEBUGGING
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/* Wait for it to be our turn to print. */
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WaitCoreTicket();
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::std::va_list vl;
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va_start(vl, format);
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MESOSPHERE_RELEASE_LOG("Core[%d]: Kernel Panic at %s:%d\n", GetCurrentCoreId(), file, line);
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MESOSPHERE_RELEASE_VLOG(format, vl);
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MESOSPHERE_RELEASE_LOG("\n");
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va_end(vl);
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#endif
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StopSystem();
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}
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NORETURN WEAK_SYMBOL void Panic() {
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StopSystem();
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}
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}
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