util: prevent optimizer from removing endian-swapped writes

libraries/libstratosphere/include/stratosphere/ncm/ncm_content_meta_extended_data.hpp

@@ -843,7 +843,7 @@ namespace ams::ncm {
                 R_SUCCEED_IF(m_header.has_value());
 
                 /* Get our header. */
-                PatchMetaExtendedDataHeader header;
+                PatchMetaExtendedDataHeader header{};
                 R_TRY(this->GetHeader(std::addressof(header)));
 
                 /* Set our header. */

libraries/libstratosphere/include/stratosphere/pwm/driver/pwm_i_pwm_driver.hpp

@@ -38,6 +38,7 @@ namespace ams::pwm::driver {
             virtual Result SetPeriod(IPwmDevice *device, TimeSpan period) = 0;
             virtual Result GetPeriod(TimeSpan *out, IPwmDevice *device)   = 0;
 
+            /* TODO: Nintendo removed these in 14.0.0. Should we? */
             virtual Result SetDuty(IPwmDevice *device, int duty) = 0;
             virtual Result GetDuty(int *out, IPwmDevice *device) = 0;
 

libraries/libstratosphere/include/stratosphere/pwm/sf/pwm_sf_i_channel_session.hpp

@@ -18,14 +18,14 @@
 #include <vapours.hpp>
 #include <stratosphere/pwm/pwm_types.hpp>
 
-#define AMS_PWM_I_CHANNEL_SESSION_INTERFACE_INFO(C, H)                                                                \
-    AMS_SF_METHOD_INFO(C, H,  0, Result, SetPeriod,  (TimeSpanType period),            (period)                     ) \
-    AMS_SF_METHOD_INFO(C, H,  1, Result, GetPeriod,  (ams::sf::Out<TimeSpanType> out), (out)                        ) \
-    AMS_SF_METHOD_INFO(C, H,  2, Result, SetDuty,    (int duty),                       (duty)                       ) \
-    AMS_SF_METHOD_INFO(C, H,  3, Result, GetDuty,    (ams::sf::Out<int> out),          (out)                        ) \
-    AMS_SF_METHOD_INFO(C, H,  4, Result, SetEnabled, (bool enabled),                   (enabled)                    ) \
-    AMS_SF_METHOD_INFO(C, H,  5, Result, GetEnabled, (ams::sf::Out<bool> out),         (out)                        ) \
-    AMS_SF_METHOD_INFO(C, H,  6, Result, SetScale,   (double scale),                   (scale),   hos::Version_6_0_0) \
+#define AMS_PWM_I_CHANNEL_SESSION_INTERFACE_INFO(C, H)                                                                                     \
+    AMS_SF_METHOD_INFO(C, H,  0, Result, SetPeriod,  (TimeSpanType period),            (period))                                           \
+    AMS_SF_METHOD_INFO(C, H,  1, Result, GetPeriod,  (ams::sf::Out<TimeSpanType> out), (out))                                              \
+    AMS_SF_METHOD_INFO(C, H,  2, Result, SetDuty,    (int duty),                       (duty),    hos::Version_Min,   hos::Version_13_2_1) \
+    AMS_SF_METHOD_INFO(C, H,  3, Result, GetDuty,    (ams::sf::Out<int> out),          (out),     hos::Version_Min,   hos::Version_13_2_1) \
+    AMS_SF_METHOD_INFO(C, H,  4, Result, SetEnabled, (bool enabled),                   (enabled))                                          \
+    AMS_SF_METHOD_INFO(C, H,  5, Result, GetEnabled, (ams::sf::Out<bool> out),         (out))                                              \
+    AMS_SF_METHOD_INFO(C, H,  6, Result, SetScale,   (double scale),                   (scale),   hos::Version_6_0_0)                      \
     AMS_SF_METHOD_INFO(C, H,  7, Result, GetScale,   (ams::sf::Out<double> out),       (out),     hos::Version_6_0_0)
 
 AMS_SF_DEFINE_INTERFACE(ams::pwm::sf, IChannelSession, AMS_PWM_I_CHANNEL_SESSION_INTERFACE_INFO, 0xAC0A18F9)

libraries/libstratosphere/libstratosphere.mk

@@ -148,6 +148,8 @@ init_libnx_shim.os.horizon.o: CXXFLAGS += -fno-lto
 
 result_get_name.o: CXXFLAGS += -fno-lto
 
+crypto_sha256_generator.o: CXXFLAGS += -fno-lto
+
 spl_secure_monitor_api.os.generic.o: CXXFLAGS += -I$(ATMOSPHERE_LIBRARIES_DIR)/libexosphere/include
 fs_id_string_impl.os.generic.o: CXXFLAGS += -I$(ATMOSPHERE_LIBRARIES_DIR)/libexosphere/include
 

libraries/libstratosphere/source/pwm/driver/board/nintendo/nx/impl/pwm_pwm_driver_impl.cpp

@@ -79,7 +79,7 @@ namespace ams::pwm::driver::board::nintendo::nx::impl {
         /* Configure initial settings. */
         /* NOTE: None of these results are checked. */
         this->SetEnabled(device, false);
-        this->SetDuty(device, 0);
+        this->SetScale(device, 0.0);
         this->SetPeriod(device, DefaultChannelPeriod);
         R_SUCCEED();
     }
@@ -169,8 +169,16 @@ namespace ams::pwm::driver::board::nintendo::nx::impl {
         /* Convert the scale to a duty. */
         const int duty = static_cast<int>(((scale * 256.0) / 100.0) + 0.5);
 
-        /* Set the duty. */
-        R_RETURN(this->SetDuty(device, duty));
+        /* Validate the duty. */
+        R_UNLESS(0 <= duty && duty <= MaxDuty, pwm::ResultInvalidArgument());
+
+        /* Acquire exclusive access to the device registers. */
+        std::scoped_lock lk(device->SafeCastTo<PwmDeviceImpl>());
+
+        /* Update the duty. */
+        reg::ReadWrite(this->GetRegistersFor(device) + PWM_CONTROLLER_PWM_CSR, PWM_REG_BITS_VALUE(PWM_CSR_PWM, static_cast<u32>(duty)));
+
+        R_SUCCEED();
     }
 
     Result PwmDriverImpl::GetScale(double *out, IPwmDevice *device) {

libraries/libvapours/include/vapours/crypto/crypto_sha256_generator.hpp

@@ -47,9 +47,9 @@ namespace ams::crypto {
             };
             static constexpr size_t Asn1IdentifierSize = util::size(Asn1Identifier);
         private:
-            Impl m_impl;
+            Impl m_impl{};
         public:
-            Sha256Generator() { /* ... */ }
+            Sha256Generator() = default;
 
             void Initialize() {
                 m_impl.Initialize();

libraries/libvapours/include/vapours/util/util_endian.hpp

@@ -144,12 +144,12 @@ namespace ams::util {
 
     template<std::integral T>
     constexpr ALWAYS_INLINE void StoreBigEndian(T *ptr, T val) {
-        *ptr = ConvertToBigEndian<T>(val);
+        *static_cast<volatile T *>(ptr) = ConvertToBigEndian<T>(val);
     }
 
     template<std::integral T>
     constexpr ALWAYS_INLINE void StoreLittleEndian(T *ptr, T val) {
-        *ptr = ConvertToLittleEndian<T>(val);
+        *static_cast<volatile T *>(ptr) = ConvertToLittleEndian<T>(val);
     }
 
 }

libraries/libvapours/source/crypto/crypto_sha256_generator.cpp

@@ -18,7 +18,7 @@
 namespace ams::crypto {
 
     void GenerateSha256(void *dst, size_t dst_size, const void *src, size_t src_size) {
-        Sha256Generator gen;
+        Sha256Generator gen{};
 
         gen.Initialize();
         gen.Update(src, src_size);