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Atmosphere/stratosphere/loader/source/ldr_capabilities.cpp

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/*
* Copyright (c) 2018-2019 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/>.
*/
#include "ldr_capabilities.hpp"
namespace ams::ldr::caps {
namespace {
/* Types. */
enum class CapabilityId {
KernelFlags = 3,
SyscallMask = 4,
MapRange = 6,
MapPage = 7,
InterruptPair = 11,
ApplicationType = 13,
KernelVersion = 14,
HandleTable = 15,
DebugFlags = 16,
Empty = 32,
};
constexpr CapabilityId GetCapabilityId(u32 cap) {
return static_cast<CapabilityId>(__builtin_ctz(~cap));
}
template<CapabilityId Id>
class Capability {
public:
static constexpr u32 ValueShift = static_cast<u32>(Id) + 1;
static constexpr u32 IdMask = (1u << (ValueShift - 1)) - 1;
private:
u32 value;
public:
Capability(u32 v) : value(v) { /* ... */ }
CapabilityId GetId() const {
return Id;
}
u32 GetValue() const {
return this->value >> ValueShift;
}
};
#define CAPABILITY_CLASS_NAME(id) Capability##id
#define CAPABILITY_BASE_CLASS(id) Capability<CapabilityId::id>
#define DEFINE_CAPABILITY_CLASS(id, member_functions) \
class CAPABILITY_CLASS_NAME(id) : public CAPABILITY_BASE_CLASS(id) { \
public: \
CAPABILITY_CLASS_NAME(id)(u32 v) : CAPABILITY_BASE_CLASS(id)(v) { /* ... */ } \
\
static CAPABILITY_CLASS_NAME(id) Decode(u32 v) { return CAPABILITY_CLASS_NAME(id)(v); } \
\
member_functions \
}
/* Class definitions. */
DEFINE_CAPABILITY_CLASS(KernelFlags,
u32 GetMaximumThreadPriority() const {
return (this->GetValue() >> 0) & 0x3F;
}
u32 GetMinimumThreadPriority() const {
return (this->GetValue() >> 6) & 0x3F;
}
u32 GetMinimumCoreId() const {
return (this->GetValue() >> 12) & 0xFF;
}
u32 GetMaximumCoreId() const {
return (this->GetValue() >> 20) & 0xFF;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
if (this->GetMinimumThreadPriority() < restriction.GetMinimumThreadPriority() ||
this->GetMaximumThreadPriority() > restriction.GetMaximumThreadPriority() ||
this->GetMinimumThreadPriority() > this->GetMaximumThreadPriority()) {
return false;
}
if (this->GetMinimumCoreId() < restriction.GetMinimumCoreId() ||
this->GetMaximumCoreId() > restriction.GetMaximumCoreId() ||
this->GetMinimumCoreId() > this->GetMaximumCoreId()) {
return false;
}
return true;
}
}
return false;
}
);
DEFINE_CAPABILITY_CLASS(SyscallMask,
u32 GetMask() const {
return (this->GetValue() >> 0) & 0xFFFFFF;
}
u32 GetIndex() const {
return (this->GetValue() >> 24) & 0x7;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
if (this->GetIndex() == restriction.GetIndex() && this->GetMask() == restriction.GetMask()) {
return true;
}
}
}
return false;
}
);
DEFINE_CAPABILITY_CLASS(MapRange,
static constexpr size_t SizeMax = 0x100000;
u32 GetAddressSize() const {
return (this->GetValue() >> 0) & 0xFFFFFF;
}
u32 GetFlag() const {
return (this->GetValue() >> 24) & 0x1;
}
bool IsValid(const u32 next_cap, const u32 *kac, size_t kac_count) const {
if (GetCapabilityId(next_cap) != this->GetId()) {
return false;
}
const auto next = Decode(next_cap);
const u32 start = this->GetAddressSize();
const u32 size = next.GetAddressSize();
const u32 end = start + size;
if (size >= SizeMax) {
return false;
}
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i++]);
if (i >= kac_count || GetCapabilityId(kac[i]) != this->GetId()) {
return false;
}
const auto restriction_next = Decode(kac[i]);
const u32 restriction_start = restriction.GetAddressSize();
const u32 restriction_size = restriction_next.GetAddressSize();
const u32 restriction_end = restriction_start + restriction_size;
if (restriction_size >= SizeMax) {
continue;
}
if (this->GetFlag() == restriction.GetFlag() && next.GetFlag() == restriction_next.GetFlag()) {
if (restriction_start <= start && start <= restriction_end && end <= restriction_end) {
return true;
}
}
}
}
return false;
}
);
DEFINE_CAPABILITY_CLASS(MapPage,
u32 GetAddress() const {
return (this->GetValue() >> 0) & 0xFFFFFF;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
if (this->GetValue() == restriction.GetValue()) {
return true;
}
}
}
return false;
}
);
DEFINE_CAPABILITY_CLASS(InterruptPair,
static constexpr u32 EmptyInterruptId = 0x3FF;
u32 GetInterruptId0() const {
return (this->GetValue() >> 0) & 0x3FF;
}
u32 GetInterruptId1() const {
return (this->GetValue() >> 10) & 0x3FF;
}
bool IsSingleIdValid(const u32 id, const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
if (restriction.GetInterruptId0() == EmptyInterruptId && restriction.GetInterruptId1() == EmptyInterruptId) {
return true;
}
if (restriction.GetInterruptId0() == id || restriction.GetInterruptId1() == id) {
return true;
}
}
}
return false;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
return IsSingleIdValid(this->GetInterruptId0(), kac, kac_count) && IsSingleIdValid(this->GetInterruptId1(), kac, kac_count);
}
);
DEFINE_CAPABILITY_CLASS(ApplicationType,
u32 GetApplicationType() const {
return (this->GetValue() >> 0) & 0x3;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
return restriction.GetValue() == this->GetValue();
}
}
return false;
}
static constexpr u32 Encode(u32 app_type) {
return ((app_type & 3) << ValueShift) | IdMask;
}
);
DEFINE_CAPABILITY_CLASS(KernelVersion,
u32 GetMinorVersion() const {
return (this->GetValue() >> 0) & 0xF;
}
u32 GetMajorVersion() const {
/* TODO: Are upper bits unused? */
return (this->GetValue() >> 4) & 0x1FFF;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
return restriction.GetValue() == this->GetValue();
}
}
return false;
}
);
DEFINE_CAPABILITY_CLASS(HandleTable,
u32 GetSize() const {
return (this->GetValue() >> 0) & 0x3FF;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
return this->GetSize() <= restriction.GetSize();
}
}
return false;
}
);
DEFINE_CAPABILITY_CLASS(DebugFlags,
bool GetAllowDebug() const {
return (this->GetValue() >> 0) & 1;
}
bool GetForceDebug() const {
return (this->GetValue() >> 1) & 1;
}
bool IsValid(const u32 *kac, size_t kac_count) const {
for (size_t i = 0; i < kac_count; i++) {
if (GetCapabilityId(kac[i]) == this->GetId()) {
const auto restriction = Decode(kac[i]);
return (restriction.GetValue() & this->GetValue()) == this->GetValue();
}
}
return false;
}
static constexpr u32 Encode(bool allow_debug, bool force_debug) {
const u32 desc = (static_cast<u32>(force_debug) << 1) | (static_cast<u32>(allow_debug) << 0);
return (desc << ValueShift) | IdMask;
}
);
}
/* Capabilities API. */
Result ValidateCapabilities(const void *acid_kac, size_t acid_kac_size, const void *aci_kac, size_t aci_kac_size) {
const u32 *acid_caps = reinterpret_cast<const u32 *>(acid_kac);
const u32 *aci_caps = reinterpret_cast<const u32 *>(aci_kac);
const size_t num_acid_caps = acid_kac_size / sizeof(*acid_caps);
const size_t num_aci_caps = aci_kac_size / sizeof(*aci_caps);
for (size_t i = 0; i < num_aci_caps; i++) {
const u32 cur_cap = aci_caps[i];
const auto id = GetCapabilityId(cur_cap);
#define VALIDATE_CASE(id) \
case CapabilityId::id: \
R_UNLESS(Capability##id::Decode(cur_cap).IsValid(acid_caps, num_acid_caps), ldr::ResultInvalidCapability##id()); \
break
switch (id) {
VALIDATE_CASE(KernelFlags);
VALIDATE_CASE(SyscallMask);
VALIDATE_CASE(MapPage);
VALIDATE_CASE(InterruptPair);
VALIDATE_CASE(ApplicationType);
VALIDATE_CASE(KernelVersion);
VALIDATE_CASE(HandleTable);
VALIDATE_CASE(DebugFlags);
case CapabilityId::MapRange:
{
/* Map Range needs extra logic because there it involves two sequential caps. */
i++;
R_UNLESS(i < num_aci_caps, ldr::ResultInvalidCapabilityMapRange());
R_UNLESS(CapabilityMapRange::Decode(cur_cap).IsValid(aci_caps[i], acid_caps, num_acid_caps), ldr::ResultInvalidCapabilityMapRange());
}
break;
default:
R_UNLESS(id == CapabilityId::Empty, ldr::ResultUnknownCapability());
break;
}
#undef VALIDATE_CASE
}
return ResultSuccess();
}
u16 GetProgramInfoFlags(const void *kac, size_t kac_size) {
const u32 *caps = reinterpret_cast<const u32 *>(kac);
const size_t num_caps = kac_size / sizeof(*caps);
u16 flags = 0;
for (size_t i = 0; i < num_caps; i++) {
const u32 cur_cap = caps[i];
switch (GetCapabilityId(cur_cap)) {
case CapabilityId::ApplicationType:
{
const auto app_type = CapabilityApplicationType::Decode(cur_cap).GetApplicationType() & ProgramInfoFlag_ApplicationTypeMask;
if (app_type != ProgramInfoFlag_InvalidType) {
flags |= app_type;
}
}
break;
case CapabilityId::DebugFlags:
if (CapabilityDebugFlags::Decode(cur_cap).GetAllowDebug()) {
flags |= ProgramInfoFlag_AllowDebug;
}
break;
default:
break;
}
}
return flags;
}
void SetProgramInfoFlags(u16 flags, void *kac, size_t kac_size) {
u32 *caps = reinterpret_cast<u32 *>(kac);
const size_t num_caps = kac_size / sizeof(*caps);
for (size_t i = 0; i < num_caps; i++) {
const u32 cur_cap = caps[i];
switch (GetCapabilityId(cur_cap)) {
case CapabilityId::ApplicationType:
caps[i] = CapabilityApplicationType::Encode(flags & ProgramInfoFlag_ApplicationTypeMask);
break;
case CapabilityId::DebugFlags:
caps[i] = CapabilityDebugFlags::Encode((flags & ProgramInfoFlag_AllowDebug) != 0, CapabilityDebugFlags::Decode(cur_cap).GetForceDebug());
break;
default:
break;
}
}
}
}
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