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nce: implement instruction emulation for misaligned memory accesses

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This commit is contained in:
Liam
2023-11-30 14:05:02 -05:00
parent 11b123ba01
commit bd59934350
9 changed files with 3849 additions and 43 deletions
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100
src/core/arm/nce/arm_nce.cpp
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@ -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);
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);
// 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 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);
});
}