os: implement waitable management.

This implements waitable management for Events (and
implements Events). It also refactors PM to use new
Event/Waitable semantics, and also adds STS_ASSERT
as a macro for asserting a boolean expression. The
rest of stratosphere has been refactored to use
STS_ASSERT whenever possible.

stratosphere/loader/source/ldr_content_management.cpp

@@ -83,9 +83,7 @@ namespace sts::ldr {
         Result MountNspFileSystem(const char *device_name, const char *path) {
             FsFileSystem fs;
             R_TRY(fsOpenFileSystemWithId(&fs, 0, FsFileSystemType_ApplicationPackage, path));
-            if(fsdevMountDevice(device_name, fs) < 0) {
-                std::abort();
-            }
+            STS_ASSERT(fsdevMountDevice(device_name, fs) >= 0);
             return ResultSuccess;
         }
 
@@ -178,9 +176,7 @@ namespace sts::ldr {
         /* Try to mount the content path. */
         FsFileSystem fs;
         R_TRY(fsldrOpenCodeFileSystem(static_cast<u64>(loc.title_id), path, &fs));
-        if(fsdevMountDevice(CodeFileSystemDeviceName, fs) == -1) {
-            std::abort();
-        }
+        STS_ASSERT(fsdevMountDevice(CodeFileSystemDeviceName, fs) != -1);
 
         /* Note that we mounted code. */
         this->is_code_mounted = true;

stratosphere/loader/source/ldr_ecs.cpp

@@ -73,7 +73,7 @@ namespace sts::ldr::ecs {
         std::snprintf(device_name, DeviceNameSizeMax, "ecs-%016lx", static_cast<u64>(title_id));
 
         /* Create session. */
-        AutoHandle server, client;
+        os::ManagedHandle server, client;
         R_TRY(svcCreateSession(server.GetPointer(), client.GetPointer(), 0, 0));
 
         /* Create service. */

stratosphere/loader/source/ldr_loader_service.cpp

@@ -27,7 +27,7 @@ namespace sts::ldr {
 
     /* Official commands. */
     Result LoaderService::CreateProcess(Out<MovedHandle> proc_h, PinId id, u32 flags, CopiedHandle reslimit) {
-        AutoHandle reslimit_holder(reslimit.GetValue());
+        os::ManagedHandle reslimit_holder(reslimit.GetValue());
         ncm::TitleLocation loc;
         char path[FS_MAX_PATH];
 

stratosphere/loader/source/ldr_process_creation.cpp

@@ -56,9 +56,7 @@ namespace sts::ldr {
         };
 
         constexpr const char *GetNsoName(size_t idx) {
-            if (idx >= Nso_Count) {
-                std::abort();
-            }
+            STS_ASSERT(idx < Nso_Count);
 
             constexpr const char *NsoNames[Nso_Count] = {
                 "rtld",
@@ -91,7 +89,7 @@ namespace sts::ldr {
         static_assert(sizeof(CreateProcessInfo) == 0x30, "CreateProcessInfo definition!");
 
         struct ProcessInfo {
-            AutoHandle process_handle;
+            os::ManagedHandle process_handle;
             uintptr_t args_address;
             size_t    args_size;
             uintptr_t nso_address[Nso_Count];