diff options
Diffstat (limited to '')
-rw-r--r-- | src/core/arm/nce/arm_nce.cpp | 102 |
1 files changed, 72 insertions, 30 deletions
diff --git a/src/core/arm/nce/arm_nce.cpp b/src/core/arm/nce/arm_nce.cpp index b42a32a0b..858c9f0a7 100644 --- a/src/core/arm/nce/arm_nce.cpp +++ b/src/core/arm/nce/arm_nce.cpp @@ -6,7 +6,7 @@ #include "common/signal_chain.h" #include "core/arm/nce/arm_nce.h" -#include "core/arm/nce/guest_context.h" +#include "core/arm/nce/interpreter_visitor.h" #include "core/arm/nce/patcher.h" #include "core/core.h" #include "core/memory.h" @@ -21,7 +21,8 @@ namespace Core { namespace { -struct sigaction g_orig_action; +struct sigaction g_orig_bus_action; +struct sigaction g_orig_segv_action; // Verify assembly offsets. using NativeExecutionParameters = Kernel::KThread::NativeExecutionParameters; @@ -37,6 +38,9 @@ fpsimd_context* GetFloatingPointState(mcontext_t& host_ctx) { return reinterpret_cast<fpsimd_context*>(header); } +using namespace Common::Literals; +constexpr u32 StackSize = 32_KiB; + } // namespace void* ArmNce::RestoreGuestContext(void* raw_context) { @@ -104,19 +108,10 @@ void ArmNce::SaveGuestContext(GuestContext* guest_ctx, void* raw_context) { host_ctx.regs[0] = guest_ctx->esr_el1.exchange(0); } -bool ArmNce::HandleGuestFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) { +bool ArmNce::HandleFailedGuestFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) { auto& host_ctx = static_cast<ucontext_t*>(raw_context)->uc_mcontext; auto* info = static_cast<siginfo_t*>(raw_info); - // Try to handle an invalid access. - // TODO: handle accesses which split a page? - const Common::ProcessAddress addr = - (reinterpret_cast<u64>(info->si_addr) & ~Memory::YUZU_PAGEMASK); - if (guest_ctx->system->ApplicationMemory().InvalidateNCE(addr, Memory::YUZU_PAGESIZE)) { - // We handled the access successfully and are returning to guest code. - return true; - } - // We can't handle the access, so determine why we crashed. const bool is_prefetch_abort = host_ctx.pc == reinterpret_cast<u64>(info->si_addr); @@ -143,8 +138,44 @@ bool ArmNce::HandleGuestFault(GuestContext* guest_ctx, void* raw_info, void* raw return false; } -void ArmNce::HandleHostFault(int sig, void* raw_info, void* raw_context) { - return g_orig_action.sa_sigaction(sig, static_cast<siginfo_t*>(raw_info), raw_context); +bool ArmNce::HandleGuestAlignmentFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) { + auto& host_ctx = static_cast<ucontext_t*>(raw_context)->uc_mcontext; + auto* fpctx = GetFloatingPointState(host_ctx); + auto& memory = guest_ctx->system->ApplicationMemory(); + + // Match and execute an instruction. + auto next_pc = MatchAndExecuteOneInstruction(memory, &host_ctx, fpctx); + if (next_pc) { + host_ctx.pc = *next_pc; + return true; + } + + // We couldn't handle the access. + return HandleFailedGuestFault(guest_ctx, raw_info, raw_context); +} + +bool ArmNce::HandleGuestAccessFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) { + auto* info = static_cast<siginfo_t*>(raw_info); + + // Try to handle an invalid access. + // TODO: handle accesses which split a page? + const Common::ProcessAddress addr = + (reinterpret_cast<u64>(info->si_addr) & ~Memory::YUZU_PAGEMASK); + if (guest_ctx->system->ApplicationMemory().InvalidateNCE(addr, Memory::YUZU_PAGESIZE)) { + // We handled the access successfully and are returning to guest code. + return true; + } + + // We couldn't handle the access. + return HandleFailedGuestFault(guest_ctx, raw_info, raw_context); +} + +void ArmNce::HandleHostAlignmentFault(int sig, void* raw_info, void* raw_context) { + return g_orig_bus_action.sa_sigaction(sig, static_cast<siginfo_t*>(raw_info), raw_context); +} + +void ArmNce::HandleHostAccessFault(int sig, void* raw_info, void* raw_context) { + return g_orig_segv_action.sa_sigaction(sig, static_cast<siginfo_t*>(raw_info), raw_context); } void ArmNce::LockThread(Kernel::KThread* thread) { @@ -220,6 +251,9 @@ void ArmNce::SetSvcArguments(std::span<const uint64_t, 8> args) { ArmNce::ArmNce(System& system, bool uses_wall_clock, std::size_t core_index) : ArmInterface{uses_wall_clock}, m_system{system}, m_core_index{core_index} { m_guest_ctx.system = &m_system; + + // Allocate signal stack. + m_stack = std::make_unique<u8[]>(StackSize); } ArmNce::~ArmNce() = default; @@ -227,16 +261,23 @@ ArmNce::~ArmNce() = default; void ArmNce::Initialize() { m_thread_id = gettid(); - // Setup our signals - static std::once_flag signals; - std::call_once(signals, [] { + // Configure signal stack. + stack_t ss{}; + ss.ss_sp = m_stack.get(); + ss.ss_size = StackSize; + sigaltstack(&ss, nullptr); + + // Set up signals. + static std::once_flag flag; + std::call_once(flag, [] { using HandlerType = decltype(sigaction::sa_sigaction); sigset_t signal_mask; sigemptyset(&signal_mask); sigaddset(&signal_mask, ReturnToRunCodeByExceptionLevelChangeSignal); sigaddset(&signal_mask, BreakFromRunCodeSignal); - sigaddset(&signal_mask, GuestFaultSignal); + sigaddset(&signal_mask, GuestAlignmentFaultSignal); + sigaddset(&signal_mask, GuestAccessFaultSignal); struct sigaction return_to_run_code_action {}; return_to_run_code_action.sa_flags = SA_SIGINFO | SA_ONSTACK; @@ -253,18 +294,19 @@ void ArmNce::Initialize() { break_from_run_code_action.sa_mask = signal_mask; Common::SigAction(BreakFromRunCodeSignal, &break_from_run_code_action, nullptr); - struct sigaction fault_action {}; - fault_action.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART; - fault_action.sa_sigaction = reinterpret_cast<HandlerType>(&ArmNce::GuestFaultSignalHandler); - fault_action.sa_mask = signal_mask; - Common::SigAction(GuestFaultSignal, &fault_action, &g_orig_action); - - // Simplify call for g_orig_action. - // These fields occupy the same space in memory, so this should be a no-op in practice. - if (!(g_orig_action.sa_flags & SA_SIGINFO)) { - g_orig_action.sa_sigaction = - reinterpret_cast<decltype(g_orig_action.sa_sigaction)>(g_orig_action.sa_handler); - } + struct sigaction alignment_fault_action {}; + alignment_fault_action.sa_flags = SA_SIGINFO | SA_ONSTACK; + alignment_fault_action.sa_sigaction = + reinterpret_cast<HandlerType>(&ArmNce::GuestAlignmentFaultSignalHandler); + alignment_fault_action.sa_mask = signal_mask; + Common::SigAction(GuestAlignmentFaultSignal, &alignment_fault_action, nullptr); + + struct sigaction access_fault_action {}; + access_fault_action.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART; + access_fault_action.sa_sigaction = + reinterpret_cast<HandlerType>(&ArmNce::GuestAccessFaultSignalHandler); + access_fault_action.sa_mask = signal_mask; + Common::SigAction(GuestAccessFaultSignal, &access_fault_action, &g_orig_segv_action); }); } |