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Code Issues Releases Activity

kern: improve panic output

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This commit is contained in:
Michael Scire 2020-02-14 04:01:09 -08:00
parent 5b98426171
commit b3e6571586
1 changed files with 74 additions and 27 deletions
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101
libraries/libmesosphere/source/kern_panic.cpp
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@ -29,33 +29,81 @@ namespace ams::kern {
namespace {
size_t g_panic_count = 0;
constexpr std::array<s32, cpu::NumCores> NegativeArray = [] {
std::array<s32, cpu::NumCores> arr = {};
for (size_t i = 0; i < arr.size(); i++) {
arr[i] = -1;
}
return arr;
}();
std::atomic<s32> g_next_ticket = 0;
std::atomic<s32> g_current_ticket = 0;
std::array<s32, cpu::NumCores> g_core_tickets = NegativeArray;
s32 GetCoreTicket() {
const s32 core_id = GetCurrentCoreId();
if (g_core_tickets[core_id] == -1) {
g_core_tickets[core_id] = 2 * g_next_ticket.fetch_add(1);
}
return g_core_tickets[core_id];
}
void WaitCoreTicket() {
const s32 expected = GetCoreTicket();
const s32 desired = expected + 1;
s32 compare = g_current_ticket;
do {
if (compare == desired) {
break;
}
compare = expected;
} while (!g_current_ticket.compare_exchange_weak(compare, desired));
}
void ReleaseCoreTicket() {
const s32 expected = GetCoreTicket() + 1;
const s32 desired = expected + 1;
s32 compare = g_current_ticket;
do {
if (compare != expected) {
break;
}
} while (!g_current_ticket.compare_exchange_weak(compare, desired));
}
[[gnu::unused]] void PrintCurrentState() {
if (g_panic_count == 1) {
g_panic_count++;
/* Wait for it to be our turn to print. */
WaitCoreTicket();
MESOSPHERE_RELEASE_LOG("Base Address: %p\n", _start);
const s32 core_id = GetCurrentCoreId();
MESOSPHERE_RELEASE_LOG("Core[%d] Current State:\n", core_id);
/* TODO: Dump register state. */
/* TODO: Dump register state. */
#ifdef ATMOSPHERE_ARCH_ARM64
MESOSPHERE_RELEASE_LOG("Backtrace:\n");
uintptr_t fp = reinterpret_cast<uintptr_t>(__builtin_frame_address(0));
for (size_t i = 0; i < 32 && fp && util::IsAligned(fp, 0x10) && cpu::GetPhysicalAddressWritable(nullptr, fp, true); i++) {
struct {
uintptr_t fp;
uintptr_t lr;
} *stack_frame = reinterpret_cast<decltype(stack_frame)>(fp);
MESOSPHERE_RELEASE_LOG(" [%02zx]: %p\n", i, reinterpret_cast<void *>(stack_frame->lr));
fp = stack_frame->fp;
}
#endif
}
#ifdef ATMOSPHERE_ARCH_ARM64
MESOSPHERE_RELEASE_LOG(" Backtrace:\n");
uintptr_t fp = reinterpret_cast<uintptr_t>(__builtin_frame_address(0));
for (size_t i = 0; i < 32 && fp && util::IsAligned(fp, 0x10) && cpu::GetPhysicalAddressWritable(nullptr, fp, true); i++) {
struct {
uintptr_t fp;
uintptr_t lr;
} *stack_frame = reinterpret_cast<decltype(stack_frame)>(fp);
MESOSPHERE_RELEASE_LOG(" [%02zx]: %p\n", i, reinterpret_cast<void *>(stack_frame->lr));
fp = stack_frame->fp;
}
#endif
MESOSPHERE_RELEASE_LOG("\n");
/* Allow the next core to print. */
ReleaseCoreTicket();
}
NORETURN void StopSystem() {
#ifdef MESOSPHERE_BUILD_FOR_DEBUGGING
/* Print the current core. */
PrintCurrentState();
#endif
@ -66,16 +114,15 @@ namespace ams::kern {
NORETURN WEAK_SYMBOL void Panic(const char *file, int line, const char *format, ...) {
#ifdef MESOSPHERE_BUILD_FOR_DEBUGGING
if (g_panic_count == 0) {
g_panic_count++;
/* Wait for it to be our turn to print. */
WaitCoreTicket();
::std::va_list vl;
va_start(vl, format);
MESOSPHERE_RELEASE_LOG("KernelPanic (Core %d): %s:%d\n", GetCurrentCoreId(), file, line);
MESOSPHERE_RELEASE_VLOG(format, vl);
MESOSPHERE_RELEASE_LOG("\n");
va_end(vl);
}
::std::va_list vl;
va_start(vl, format);
MESOSPHERE_RELEASE_LOG("Core[%d]: Kernel Panic at %s:%d\n", GetCurrentCoreId(), file, line);
MESOSPHERE_RELEASE_VLOG(format, vl);
MESOSPHERE_RELEASE_LOG("\n");
va_end(vl);
#endif
StopSystem();