nold/Atmosphere
1
0
Fork 0
mirror of https://github.com/Atmosphere-NX/Atmosphere synced 2024-12-31 17:31:15 +00:00
Code Issues Projects Releases Packages Wiki Activity

kern: SvcReturnFromException

Browse source
This commit is contained in:
Michael Scire 2020-07-31 05:52:59 -07:00 committed by SciresM
parent 8cd81b3092
commit 5d462c626c
11 changed files with 647 additions and 56 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_debug.hpp
View file

@ -47,6 +47,21 @@ namespace ams::kern::arch::arm64 {
static Result BreakIfAttached(ams::svc::BreakReason break_reason, uintptr_t address, size_t size);
static Result SetHardwareBreakPoint(ams::svc::HardwareBreakPointRegisterName name, u64 flags, u64 value);
static constexpr bool IsBreakInstruction(u32 insn, u32 psr) {
constexpr u32 BreakInstructionAarch64 = 0xE7FFFFFF;
constexpr u32 BreakInstructionAarch32 = 0xE7FFDEFE;
constexpr u32 BreakInstructionThumb32 = 0xB68E;
if ((psr & 0x10) == 0) {
return insn == BreakInstructionAarch64;
} else {
if ((psr & 0x20) == 0) {
return insn == BreakInstructionAarch32;
} else {
return insn == BreakInstructionThumb32;
}
}
}
/* TODO: This is a placeholder definition. */
};

26
libraries/libmesosphere/include/mesosphere/kern_k_capabilities.hpp
View file

@ -312,6 +312,32 @@ namespace ams::kern {
}
}
ALWAYS_INLINE void CopyEnterExceptionSvcPermissionsTo(KThread::StackParameters &sp) {
static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
/* Set ReturnFromException if allowed. */
if (GetSvcAllowedImpl(this->svc_access_flags, svc::SvcId_ReturnFromException)) {
SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
}
/* Set GetInfo if allowed. */
if (GetSvcAllowedImpl(this->svc_access_flags, svc::SvcId_GetInfo)) {
SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_GetInfo);
}
}
ALWAYS_INLINE void CopyLeaveExceptionSvcPermissionsTo(KThread::StackParameters &sp) {
static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
/* Clear ReturnFromException. */
ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
/* If pinned, clear GetInfo. */
if (sp.is_pinned) {
ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_GetInfo);
}
}
constexpr bool IsPermittedInterrupt(u32 id) const {
constexpr size_t BitsPerWord = BITSIZEOF(this->irq_access_flags[0]);
if (id < BITSIZEOF(this->irq_access_flags)) {

8
libraries/libmesosphere/include/mesosphere/kern_k_process.hpp
View file

@ -233,6 +233,14 @@ namespace ams::kern {
this->capabilities.CopyUnpinnedSvcPermissionsTo(sp);
}
void CopyEnterExceptionSvcPermissionsTo(KThread::StackParameters &sp) {
this->capabilities.CopyEnterExceptionSvcPermissionsTo(sp);
}
void CopyLeaveExceptionSvcPermissionsTo(KThread::StackParameters &sp) {
this->capabilities.CopyLeaveExceptionSvcPermissionsTo(sp);
}
constexpr KResourceLimit *GetResourceLimit() const { return this->resource_limit; }
bool ReserveResource(ams::svc::LimitableResource which, s64 value);

16
libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp
View file

@ -230,6 +230,10 @@ namespace ams::kern {
const StackParameters &GetStackParameters() const {
return *(reinterpret_cast<const StackParameters *>(this->kernel_stack_top) - 1);
}
public:
StackParameters &GetStackParametersForExceptionSvcPermission() {
return *(reinterpret_cast<StackParameters *>(this->kernel_stack_top) - 1);
}
public:
ALWAYS_INLINE s32 GetDisableDispatchCount() const {
MESOSPHERE_ASSERT_THIS();
@ -251,6 +255,18 @@ namespace ams::kern {
void Pin();
void Unpin();
ALWAYS_INLINE void SaveDebugParams(uintptr_t param1, uintptr_t param2, uintptr_t param3) {
this->debug_params[0] = param1;
this->debug_params[1] = param2;
this->debug_params[2] = param3;
}
ALWAYS_INLINE void RestoreDebugParams(uintptr_t *param1, uintptr_t *param2, uintptr_t *param3) {
*param1 = this->debug_params[0];
*param2 = this->debug_params[1];
*param3 = this->debug_params[2];
}
NOINLINE void DisableCoreMigration();
NOINLINE void EnableCoreMigration();

448
libraries/libmesosphere/source/arch/arm64/kern_exception_handlers.cpp
View file

@ -15,10 +15,52 @@
*/
#include <mesosphere.hpp>
namespace ams::kern::svc {
void RestoreContext(uintptr_t sp);
}
namespace ams::kern::arch::arm64 {
namespace {
constexpr inline u32 El0PsrMask = 0xFF0FFE20;
enum EsrEc : u32 {
EsrEc_Unknown = 0b000000,
EsrEc_WaitForInterruptOrEvent = 0b000001,
EsrEc_Cp15McrMrc = 0b000011,
EsrEc_Cp15McrrMrrc = 0b000100,
EsrEc_Cp14McrMrc = 0b000101,
EsrEc_FpAccess = 0b000111,
EsrEc_Cp14Mrrc = 0b001100,
EsrEc_BranchTarget = 0b001101,
EsrEc_IllegalExecution = 0b001110,
EsrEc_Svc32 = 0b010001,
EsrEc_Svc64 = 0b010101,
EsrEc_SystemInstruction64 = 0b011000,
EsrEc_SveZen = 0b011001,
EsrEc_PointerAuthInstruction = 0b011100,
EsrEc_InstructionAbortEl0 = 0b100000,
EsrEc_InstructionAbortEl1 = 0b100001,
EsrEc_PcAlignmentFault = 0b100010,
EsrEc_DataAbortEl0 = 0b100100,
EsrEc_DataAbortEl1 = 0b100101,
EsrEc_SpAlignmentFault = 0b100110,
EsrEc_FpException32 = 0b101000,
EsrEc_FpException64 = 0b101100,
EsrEc_SErrorInterrupt = 0b101111,
EsrEc_BreakPointEl0 = 0b110000,
EsrEc_BreakPointEl1 = 0b110001,
EsrEc_SoftwareStepEl0 = 0b110010,
EsrEc_SoftwareStepEl1 = 0b110011,
EsrEc_WatchPointEl0 = 0b110100,
EsrEc_WatchPointEl1 = 0b110101,
EsrEc_BkptInstruction = 0b111000,
EsrEc_BrkInstruction = 0b111100,
};
constexpr u32 GetInstructionData(const KExceptionContext *context, u64 esr) {
/* Check for THUMB usermode */
if ((context->psr & 0x3F) == 0x30) {
@ -35,61 +77,234 @@ namespace ams::kern::arch::arm64 {
}
void HandleUserException(KExceptionContext *context, u64 esr, u64 far, u64 afsr0, u64 afsr1, u32 data) {
KProcess *cur_process = GetCurrentProcessPointer();
KProcess &cur_process = GetCurrentProcess();
bool should_process_user_exception = KTargetSystem::IsUserExceptionHandlersEnabled();
MESOSPHERE_LOG("User Exception occurred in %s\n", cur_process->GetName());
for (size_t i = 0; i < 31; i++) {
MESOSPHERE_LOG("X[%02zu] = %016lx\n", i, context->x[i]);
}
MESOSPHERE_LOG("PC = %016lx\n", context->pc);
MESOSPHERE_LOG("SP = %016lx\n", context->sp);
/* Dump the page tables. */
/* GetCurrentProcess().GetPageTable().DumpTable(); */
GetCurrentProcess().GetPageTable().DumpMemoryBlocks();
MESOSPHERE_PANIC("Unhandled Exception in User Mode\n");
const u64 ec = (esr >> 26) & 0x3F;
switch (ec) {
case 0x0: /* Unknown */
case 0xE: /* Illegal Execution State */
case 0x11: /* SVC instruction from Aarch32 */
case 0x15: /* SVC instruction from Aarch64 */
case 0x22: /* PC Misalignment */
case 0x26: /* SP Misalignment */
case 0x2F: /* SError */
case 0x30: /* Breakpoint from lower EL */
case 0x32: /* SoftwareStep from lower EL */
case 0x34: /* Watchpoint from lower EL */
case 0x38: /* BKPT instruction */
case 0x3C: /* BRK instruction */
case EsrEc_Unknown:
case EsrEc_IllegalExecution:
case EsrEc_Svc32:
case EsrEc_Svc64:
case EsrEc_PcAlignmentFault:
case EsrEc_SpAlignmentFault:
case EsrEc_SErrorInterrupt:
case EsrEc_BreakPointEl0:
case EsrEc_SoftwareStepEl0:
case EsrEc_WatchPointEl0:
case EsrEc_BkptInstruction:
case EsrEc_BrkInstruction:
break;
default:
{
MESOSPHERE_TODO("Get memory state.");
/* If state is KMemoryState_Code and the user can't read it, set should_process_user_exception = true; */
/* If the fault address's state is KMemoryState_Code and the user can't read the address, force processing exception. */
KMemoryInfo info;
ams::svc::PageInfo pi;
if (R_SUCCEEDED(cur_process.GetPageTable().QueryInfo(std::addressof(info), std::addressof(pi), far))) {
if (info.GetState() == KMemoryState_Code && ((info.GetPermission() & KMemoryPermission_UserRead) != KMemoryPermission_UserRead)) {
should_process_user_exception = true;
}
}
}
break;
}
if (should_process_user_exception) {
MESOSPHERE_TODO("Process the user exception.");
/* If we should process the user exception (and it's not a breakpoint), try to enter. */
const bool is_software_break = (ec == EsrEc_Unknown || ec == EsrEc_IllegalExecution || ec == EsrEc_BkptInstruction || ec == EsrEc_BrkInstruction);
const bool is_breakpoint = (ec == EsrEc_BreakPointEl0 || ec == EsrEc_SoftwareStepEl0 || ec == EsrEc_WatchPointEl0);
if ((should_process_user_exception) &&
!(is_software_break && cur_process.IsAttachedToDebugger() && KDebug::IsBreakInstruction(data, context->psr)) &&
!(is_breakpoint))
{
if (cur_process.EnterUserException()) {
/* Fill out the exception info. */
const bool is_aarch64 = (context->psr & 0x10) == 0;
if (is_aarch64) {
/* 64-bit. */
ams::svc::aarch64::ExceptionInfo *info = std::addressof(GetPointer<ams::svc::aarch64::ProcessLocalRegion>(cur_process.GetProcessLocalRegionAddress())->exception_info);
for (size_t i = 0; i < util::size(info->r); ++i) {
info->r[i] = context->x[i];
}
info->sp = context->sp;
info->lr = context->x[30];
info->pc = context->pc;
info->pstate = (context->psr & El0PsrMask);
info->afsr0 = afsr0;
info->afsr1 = afsr1;
info->esr = esr;
info->far = far;
} else {
/* 32-bit. */
ams::svc::aarch32::ExceptionInfo *info = std::addressof(GetPointer<ams::svc::aarch32::ProcessLocalRegion>(cur_process.GetProcessLocalRegionAddress())->exception_info);
for (size_t i = 0; i < util::size(info->r); ++i) {
info->r[i] = context->x[i];
}
info->sp = context->x[13];
info->lr = context->x[14];
info->pc = context->pc;
info->flags = 1;
info->status_64.pstate = (context->psr & El0PsrMask);
info->status_64.afsr0 = afsr0;
info->status_64.afsr1 = afsr1;
info->status_64.esr = esr;
info->status_64.far = far;
}
/* Save the debug parameters to the current thread. */
GetCurrentThread().SaveDebugParams(far, esr, data);
/* Get the exception type. */
u32 type;
switch (ec) {
case EsrEc_Unknown:
case EsrEc_IllegalExecution:
case EsrEc_Cp15McrMrc:
case EsrEc_Cp15McrrMrrc:
case EsrEc_Cp14McrMrc:
case EsrEc_Cp14Mrrc:
case EsrEc_SystemInstruction64:
case EsrEc_BkptInstruction:
case EsrEc_BrkInstruction:
type = ams::svc::ExceptionType_InstructionAbort;
break;
case EsrEc_PcAlignmentFault:
type = ams::svc::ExceptionType_UnalignedInstruction;
break;
case EsrEc_SpAlignmentFault:
type = ams::svc::ExceptionType_UnalignedData;
break;
case EsrEc_Svc32:
case EsrEc_Svc64:
type = ams::svc::ExceptionType_InvalidSystemCall;
break;
case EsrEc_SErrorInterrupt:
type = ams::svc::ExceptionType_MemorySystemError;
break;
case EsrEc_InstructionAbortEl0:
type = ams::svc::ExceptionType_InstructionAbort;
break;
case EsrEc_DataAbortEl0:
default:
type = ams::svc::ExceptionType_DataAbort;
break;
}
/* We want to enter at the process entrypoint, with x0 = type. */
context->pc = GetInteger(cur_process.GetEntryPoint());
context->x[0] = type;
if (is_aarch64) {
context->x[1] = GetInteger(cur_process.GetProcessLocalRegionAddress() + __builtin_offsetof(ams::svc::aarch64::ProcessLocalRegion, exception_info));
auto *plr = GetPointer<ams::svc::aarch64::ProcessLocalRegion>(cur_process.GetProcessLocalRegionAddress());
context->sp = util::AlignDown(reinterpret_cast<uintptr_t>(plr->data) + sizeof(plr->data), 0x10);
context->psr = 0;
} else {
context->x[1] = GetInteger(cur_process.GetProcessLocalRegionAddress() + __builtin_offsetof(ams::svc::aarch32::ProcessLocalRegion, exception_info));
auto *plr = GetPointer<ams::svc::aarch32::ProcessLocalRegion>(cur_process.GetProcessLocalRegionAddress());
context->x[13] = util::AlignDown(reinterpret_cast<uintptr_t>(plr->data) + sizeof(plr->data), 0x10);
context->psr = 0x10;
}
/* Set exception SVC permissions. */
cur_process.CopyEnterExceptionSvcPermissionsTo(GetCurrentThread().GetStackParametersForExceptionSvcPermission());
return;
}
}
{
MESOSPHERE_TODO("Process for KDebug.");
/* Collect additional information based on the ec. */
ams::svc::DebugException exception;
uintptr_t param2 = 0;
uintptr_t param3 = 0;
switch (ec) {
case EsrEc_Unknown:
case EsrEc_IllegalExecution:
case EsrEc_BkptInstruction:
case EsrEc_BrkInstruction:
{
exception = ams::svc::DebugException_UndefinedInstruction;
param2 = far;
param3 = data;
}
break;
case EsrEc_PcAlignmentFault:
case EsrEc_SpAlignmentFault:
{
exception = ams::svc::DebugException_AlignmentFault;
param2 = far;
}
break;
case EsrEc_Svc32:
case EsrEc_Svc64:
{
exception = ams::svc::DebugException_UndefinedSystemCall;
param2 = far;
param3 = (esr & 0xFF);
}
break;
case EsrEc_BreakPointEl0:
case EsrEc_SoftwareStepEl0:
{
exception = ams::svc::DebugException_BreakPoint;
param2 = far;
param3 = ams::svc::BreakPointType_HardwareInstruction;
}
break;
case EsrEc_WatchPointEl0:
{
exception = ams::svc::DebugException_BreakPoint;
param2 = far;
param3 = ams::svc::BreakPointType_HardwareInstruction;
}
break;
case EsrEc_SErrorInterrupt:
{
exception = ams::svc::DebugException_MemorySystemError;
param2 = far;
}
break;
case EsrEc_InstructionAbortEl0:
{
exception = ams::svc::DebugException_InstructionAbort;
param2 = far;
}
break;
case EsrEc_DataAbortEl0:
default:
{
exception = ams::svc::DebugException_DataAbort;
param2 = far;
}
break;
}
MESOSPHERE_TODO("cur_process->GetProgramId()");
MESOSPHERE_RELEASE_LOG("Exception occurred. %016lx\n", 0ul);
/* Process the debug event. */
Result result = KDebug::OnDebugEvent(ams::svc::DebugEvent_Exception, exception, param2, param3);
MESOSPHERE_TODO("if (!svc::ResultNotHandled::Includes(res)) { debug process }.");
/* If we should stop processing the exception, do so. */
if (svc::ResultStopProcessingException::Includes(result)) {
return;
}
/* Print that an exception occurred. */
MESOSPHERE_RELEASE_LOG("Exception occurred. %016lx\n", GetCurrentProcess().GetProgramId());
/* If the SVC is handled, handle it. */
if (!svc::ResultNotHandled::Includes(result)) {
/* If we successfully enter jit debug, stop processing the exception. */
if (cur_process.EnterJitDebug(ams::svc::DebugEvent_Exception, exception, param2, param3)) {
return;
}
}
}
MESOSPHERE_TODO("cur_process->Exit();");
(void)cur_process;
/* Exit the current process. */
cur_process.Exit();
}
}
@ -99,6 +314,149 @@ namespace ams::kern::arch::arm64 {
KThreadContext::FpuContextSwitchHandler(GetCurrentThreadPointer());
}
/* NOTE: This function is called from ASM. */
void ReturnFromException(Result user_result) {
/* Get the current thread. */
KThread *cur_thread = GetCurrentThreadPointer();
/* Get the current exception context. */
KExceptionContext *e_ctx = GetExceptionContext(cur_thread);
/* Get the current process. */
KProcess &cur_process = GetCurrentProcess();
/* Read the exception info that userland put in tls. */
union {
ams::svc::aarch64::ExceptionInfo info64;
ams::svc::aarch32::ExceptionInfo info32;
} info = {};
const bool is_aarch64 = (e_ctx->psr & 0x10) == 0;
if (is_aarch64) {
/* We're 64-bit. */
info.info64 = GetPointer<ams::svc::aarch64::ProcessLocalRegion>(cur_process.GetProcessLocalRegionAddress())->exception_info;
} else {
/* We're 32-bit. */
info.info32 = GetPointer<ams::svc::aarch32::ProcessLocalRegion>(cur_process.GetProcessLocalRegionAddress())->exception_info;
}
/* Try to leave the user exception. */
if (cur_process.LeaveUserException()) {
/* We left user exception. Alter our SVC permissions accordingly. */
cur_process.CopyLeaveExceptionSvcPermissionsTo(cur_thread->GetStackParametersForExceptionSvcPermission());
/* Copy the user context to the thread context. */
if (is_aarch64) {
for (size_t i = 0; i < util::size(info.info64.r); ++i) {
e_ctx->x[i] = info.info64.r[i];
}
e_ctx->x[30] = info.info64.lr;
e_ctx->sp = info.info64.sp;
e_ctx->pc = info.info64.pc;
e_ctx->psr = (info.info64.pstate & El0PsrMask) | (e_ctx->psr & ~El0PsrMask);
} else {
for (size_t i = 0; i < util::size(info.info32.r); ++i) {
e_ctx->x[i] = info.info32.r[i];
}
e_ctx->x[14] = info.info32.lr;
e_ctx->x[13] = info.info32.sp;
e_ctx->pc = info.info32.pc;
e_ctx->psr = (info.info32.status_64.pstate & El0PsrMask) | (e_ctx->psr & ~El0PsrMask);
}
/* Note that PC was adjusted. */
e_ctx->write = 1;
if (R_SUCCEEDED(user_result)) {
/* If result handling succeeded, just restore the context. */
svc::RestoreContext(reinterpret_cast<uintptr_t>(e_ctx));
} else {
/* Restore the debug params for the exception. */
uintptr_t far, esr, data;
GetCurrentThread().RestoreDebugParams(std::addressof(far), std::addressof(esr), std::addressof(data));
/* Collect additional information based on the ec. */
ams::svc::DebugException exception;
uintptr_t param2 = 0;
uintptr_t param3 = 0;
switch ((esr >> 26) & 0x3F) {
case EsrEc_Unknown:
case EsrEc_IllegalExecution:
case EsrEc_BkptInstruction:
case EsrEc_BrkInstruction:
{
exception = ams::svc::DebugException_UndefinedInstruction;
param2 = far;
param3 = data;
}
break;
case EsrEc_PcAlignmentFault:
case EsrEc_SpAlignmentFault:
{
exception = ams::svc::DebugException_AlignmentFault;
param2 = far;
}
break;
case EsrEc_Svc32:
case EsrEc_Svc64:
{
exception = ams::svc::DebugException_UndefinedSystemCall;
param2 = far;
param3 = (esr & 0xFF);
}
break;
case EsrEc_SErrorInterrupt:
{
exception = ams::svc::DebugException_MemorySystemError;
param2 = far;
}
break;
case EsrEc_InstructionAbortEl0:
{
exception = ams::svc::DebugException_InstructionAbort;
param2 = far;
}
break;
case EsrEc_DataAbortEl0:
default:
{
exception = ams::svc::DebugException_DataAbort;
param2 = far;
}
break;
}
/* Process the debug event. */
Result result = KDebug::OnDebugEvent(ams::svc::DebugEvent_Exception, exception, param2, param3);
/* If the SVC is handled, handle it. */
if (!svc::ResultNotHandled::Includes(result)) {
/* If we should stop processing the exception, restore. */
if (svc::ResultStopProcessingException::Includes(result)) {
svc::RestoreContext(reinterpret_cast<uintptr_t>(e_ctx));
}
/* If we successfully enter jit debug, restore. */
if (cur_process.EnterJitDebug(ams::svc::DebugEvent_Exception, exception, param2, param3)) {
svc::RestoreContext(reinterpret_cast<uintptr_t>(e_ctx));
}
}
/* Otherwise, if result debug was returned, restore. */
if (svc::ResultDebug::Includes(result)) {
svc::RestoreContext(reinterpret_cast<uintptr_t>(e_ctx));
}
}
}
/* Print that an exception occurred. */
MESOSPHERE_RELEASE_LOG("Exception occurred. %016lx\n", GetCurrentProcess().GetProgramId());
/* Exit the current process. */
GetCurrentProcess().Exit();
}
/* NOTE: This function is called from ASM. */
void HandleException(KExceptionContext *context) {
MESOSPHERE_ASSERT(!KInterruptManager::AreInterruptsEnabled());
@ -112,14 +470,14 @@ namespace ams::kern::arch::arm64 {
/* Collect far and data based on the ec. */
switch ((esr >> 26) & 0x3F) {
case 0x0: /* Unknown */
case 0xE: /* Illegal Execution State */
case 0x38: /* BKPT instruction */
case 0x3C: /* BRK instruction */
case EsrEc_Unknown:
case EsrEc_IllegalExecution:
case EsrEc_BkptInstruction:
case EsrEc_BrkInstruction:
far = context->pc;
data = GetInstructionData(context, esr);
break;
case 0x11: /* SVC instruction from Aarch32 */
case EsrEc_Svc32:
if (context->psr & 0x20) {
/* Thumb mode. */
context->pc -= 2;
@ -129,11 +487,11 @@ namespace ams::kern::arch::arm64 {
}
far = context->pc;
break;
case 0x15: /* SVC instruction from Aarch64 */
case EsrEc_Svc64:
context->pc -= 4;
far = context->pc;
break;
case 0x30: /* Breakpoint from lower EL */
case EsrEc_BreakPointEl0:
far = context->pc;
break;
default:
@ -143,6 +501,8 @@ namespace ams::kern::arch::arm64 {
/* Note that we're in an exception handler. */
GetCurrentThread().SetInExceptionHandler();
/* Verify that spsr's M is allowable (EL0t). */
{
const bool is_user_mode = (context->psr & 0xF) == 0;
if (is_user_mode) {

4
libraries/libmesosphere/source/arch/arm64/kern_k_thread_context.cpp
View file

@ -40,6 +40,8 @@ namespace ams::kern::arch::arm64 {
namespace {
constexpr inline u32 El0PsrMask = 0xFF0FFE20;
ALWAYS_INLINE bool IsFpuEnabled() {
return cpu::ArchitecturalFeatureAccessControlRegisterAccessor().IsFpEnabled();
}
@ -216,7 +218,7 @@ namespace ams::kern::arch::arm64 {
out->lr = e_ctx->x[30];
out->sp = e_ctx->sp;
out->pc = e_ctx->pc;
out->pstate = e_ctx->psr & 0xFF0FFE20;
out->pstate = e_ctx->psr & El0PsrMask;
/* Get the thread's general purpose registers. */
if (thread->IsCallingSvc()) {

113
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_exception_asm.s Normal file
View file

@ -0,0 +1,113 @@
/*
* 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/>.
*/
/* ams::kern::svc::CallReturnFromException64(Result result) */
.section .text._ZN3ams4kern3svc25CallReturnFromException64Ev, "ax", %progbits
.global _ZN3ams4kern3svc25CallReturnFromException64Ev
.type _ZN3ams4kern3svc25CallReturnFromException64Ev, %function
_ZN3ams4kern3svc25CallReturnFromException64Ev:
/* Save registers the SVC entry handler didn't. */
stp x12, x13, [sp, #(8 * 12)]
stp x14, x15, [sp, #(8 * 14)]
stp x16, x17, [sp, #(8 * 16)]
str x19, [sp, #(8 * 19)]
stp x20, x21, [sp, #(8 * 20)]
stp x22, x23, [sp, #(8 * 22)]
stp x24, x25, [sp, #(8 * 24)]
stp x26, x26, [sp, #(8 * 26)]
stp x28, x29, [sp, #(8 * 28)]
/* Call ams::kern::arch::arm64::ReturnFromException(result). */
bl _ZN3ams4kern4arch5arm6419ReturnFromExceptionENS_6ResultE
0: /* We should never reach this point. */
b 0b
/* ams::kern::svc::CallReturnFromException64From32(Result result) */
.section .text._ZN3ams4kern3svc31CallReturnFromException64From32Ev, "ax", %progbits
.global _ZN3ams4kern3svc31CallReturnFromException64From32Ev
.type _ZN3ams4kern3svc31CallReturnFromException64From32Ev, %function
_ZN3ams4kern3svc31CallReturnFromException64From32Ev:
/* Save registers the SVC entry handler didn't. */
/* ... */
/* Call ams::kern::arch::arm64::ReturnFromException(result). */
bl _ZN3ams4kern4arch5arm6419ReturnFromExceptionENS_6ResultE
0: /* We should never reach this point. */
b 0b
/* ams::kern::svc::RestoreContext(uintptr_t sp) */
.section .text._ZN3ams4kern3svc14RestoreContextEm, "ax", %progbits
.global _ZN3ams4kern3svc14RestoreContextEm
.type _ZN3ams4kern3svc14RestoreContextEm, %function
_ZN3ams4kern3svc14RestoreContextEm:
/* Set the stack pointer, set daif. */
mov sp, x0
msr daifset, #2
0: /* We should handle DPC. */
/* Check the dpc flags. */
ldrb w8, [sp, #(0x120 + 0x10)]
cbz w8, 1f
/* We have DPC to do! */
/* Save registers and call ams::kern::KDpcManager::HandleDpc(). */
sub sp, sp, #0x40
stp x0, x1, [sp, #(8 * 0)]
stp x2, x3, [sp, #(8 * 2)]
stp x4, x5, [sp, #(8 * 4)]
stp x6, x7, [sp, #(8 * 6)]
bl _ZN3ams4kern11KDpcManager9HandleDpcEv
ldp x0, x1, [sp, #(8 * 0)]
ldp x2, x3, [sp, #(8 * 2)]
ldp x4, x5, [sp, #(8 * 4)]
ldp x6, x7, [sp, #(8 * 6)]
add sp, sp, #0x40
b 0b
1: /* We're done with DPC, and should return from the svc. */
/* Clear our in-SVC note. */
strb wzr, [sp, #(0x120 + 0x12)]
/* Restore registers. */
ldp x30, x8, [sp, #(8 * 30)]
ldp x9, x10, [sp, #(8 * 32)]
ldr x11, [sp, #(8 * 34)]
msr sp_el0, x8
msr elr_el1, x9
msr spsr_el1, x10
msr tpidr_el0, x11
ldp x0, x1, [sp, #(8 * 0)]
ldp x2, x3, [sp, #(8 * 2)]
ldp x4, x5, [sp, #(8 * 4)]
ldp x6, x7, [sp, #(8 * 6)]
ldp x8, x9, [sp, #(8 * 8)]
ldp x10, x11, [sp, #(8 * 10)]
ldp x12, x13, [sp, #(8 * 12)]
ldp x14, x15, [sp, #(8 * 14)]
ldp x16, x17, [sp, #(8 * 16)]
ldp x18, x19, [sp, #(8 * 18)]
ldp x20, x21, [sp, #(8 * 20)]
ldp x22, x23, [sp, #(8 * 22)]
ldp x24, x25, [sp, #(8 * 24)]
ldp x26, x27, [sp, #(8 * 26)]
ldp x28, x29, [sp, #(8 * 28)]
/* Return. */
add sp, sp, #0x120
eret

8
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_tables.cpp
View file

@ -29,6 +29,10 @@ namespace ams::kern::svc {
void CallReplyAndReceiveLight64();
void CallReplyAndReceiveLight64From32();
/* Declare special prototypes for ReturnFromException. */
void CallReturnFromException64();
void CallReturnFromException64From32();
namespace {
#ifndef MESOSPHERE_USE_STUBBED_SVC_TABLES
@ -69,6 +73,8 @@ namespace ams::kern::svc {
table[svc::SvcId_SendSyncRequestLight] = CallSendSyncRequestLight64From32;
table[svc::SvcId_ReplyAndReceiveLight] = CallReplyAndReceiveLight64From32;
table[svc::SvcId_ReturnFromException] = CallReturnFromException64From32;
return table;
}();
@ -83,6 +89,8 @@ namespace ams::kern::svc {
table[svc::SvcId_SendSyncRequestLight] = CallSendSyncRequestLight64;
table[svc::SvcId_ReplyAndReceiveLight] = CallReplyAndReceiveLight64;
table[svc::SvcId_ReturnFromException] = CallReturnFromException64;
return table;
}();

56
libraries/libmesosphere/source/kern_k_process.cpp
View file

@ -704,7 +704,47 @@ namespace ams::kern {
}
bool KProcess::EnterUserException() {
MESOSPHERE_UNIMPLEMENTED();
/* Get the current thread. */
KThread *cur_thread = GetCurrentThreadPointer();
MESOSPHERE_ASSERT(this == cur_thread->GetOwnerProcess());
/* Try to claim the exception thread. */
if (this->exception_thread != cur_thread) {
const uintptr_t address_key = reinterpret_cast<uintptr_t>(std::addressof(this->exception_thread));
while (true) {
{
KScopedSchedulerLock sl;
/* If the thread is terminating, it can't enter. */
if (cur_thread->IsTerminationRequested()) {
return false;
}
/* If we have no exception thread, we succeeded. */
if (this->exception_thread == nullptr) {
this->exception_thread = cur_thread;
return true;
}
/* Otherwise, wait for us to not have an exception thread. */
cur_thread->SetAddressKey(address_key);
this->exception_thread->AddWaiter(cur_thread);
if (cur_thread->GetState() == KThread::ThreadState_Runnable) {
cur_thread->SetState(KThread::ThreadState_Waiting);
}
}
/* Remove the thread as a waiter from the lock owner. */
{
KScopedSchedulerLock sl;
KThread *owner_thread = cur_thread->GetLockOwner();
if (owner_thread != nullptr) {
owner_thread->RemoveWaiter(cur_thread);
}
}
}
} else {
return false;
}
}
bool KProcess::LeaveUserException() {
@ -715,8 +755,18 @@ namespace ams::kern {
KScopedSchedulerLock sl;
if (this->exception_thread == thread) {
/* TODO */
MESOSPHERE_UNIMPLEMENTED();
this->exception_thread = nullptr;
/* Remove waiter thread. */
s32 num_waiters;
KThread *next = thread->RemoveWaiterByKey(std::addressof(num_waiters), reinterpret_cast<uintptr_t>(std::addressof(this->exception_thread)));
if (next != nullptr) {
if (next->GetState() == KThread::ThreadState_Waiting) {
next->SetState(KThread::ThreadState_Runnable);
}
}
return true;
} else {
return false;
}

8
libraries/libmesosphere/source/svc/kern_svc_exception.cpp
View file

@ -79,18 +79,10 @@ namespace ams::kern::svc {
return Break(break_reason, arg, size);
}
void ReturnFromException64(ams::Result result) {
MESOSPHERE_PANIC("Stubbed SvcReturnFromException64 was called.");
}
/* ============================= 64From32 ABI ============================= */
void Break64From32(ams::svc::BreakReason break_reason, ams::svc::Address arg, ams::svc::Size size) {
return Break(break_reason, arg, size);
}
void ReturnFromException64From32(ams::Result result) {
MESOSPHERE_PANIC("Stubbed SvcReturnFromException64From32 was called.");
}
}

1
libraries/libvapours/include/vapours/svc/svc_types_common.hpp
View file

@ -548,6 +548,7 @@ namespace ams::svc {
struct ExceptionInfoStatus64 {
u32 pstate;
u32 afsr0;
u32 afsr1;
u32 esr;
u32 far;
};