Fix emummc nintendo dir redirection

exosphere/src/emummc_cfg.h

@@ -59,9 +59,9 @@ typedef struct {
         emummc_partition_config_t partition_cfg;
         emummc_file_config_t file_cfg;
     };
-    //char emu_dir_path[EMUMMC_FILE_PATH_MAX];
+    char emu_dir_path[EMUMMC_FILE_PATH_MAX];
 } exo_emummc_config_t;
 
-_Static_assert(sizeof(exo_emummc_config_t) == 0x90, "exo_emummc_config_t definition!");
+_Static_assert(sizeof(exo_emummc_config_t) == 0x110, "exo_emummc_config_t definition!");
 
 #endif

exosphere/src/smc_ams.c

@@ -228,10 +228,10 @@ uint32_t ams_write_address(smc_args_t *args) {
 uint32_t ams_get_emummc_config(smc_args_t *args) {
     /* This retrieves configuration for the current emummc context. */
     /* args->X[1] = MMC id, must be size-bytes aligned and readable by EL0. */
-    /* args->X[2] = Pointer to output (for path for filebased), must be at least 0x80 bytes. */
+    /* args->X[2] = Pointer to output (for paths for filebased + nintendo dir), must be at least 0x100 bytes. */
-    upage_ref_t page_ref;
     const uint32_t mmc_id = (uint32_t)args->X[1];
-    void *user_address = (void *)args->X[2];
+    const uintptr_t dram_address = args->X[2];
+    const uintptr_t dram_page_offset = (dram_address & 0xFFFULL);
     const exo_emummc_config_t *emummc_cfg = exosphere_get_emummc_config();
 
     if (mmc_id != EMUMMC_MMC_NAND) {
@@ -239,35 +239,52 @@ uint32_t ams_get_emummc_config(smc_args_t *args) {
         return 1;
     }
     
+    /* Require page alignment for input address. */
+    if (!ams_is_user_addr_valid(dram_address) || dram_page_offset > 0x1000 - 0x100) {
+        return 2;
+    }
+
+    /* Map pages. */
+    ams_map_userpage(dram_address);
+    
+    void *user_address = (void *)(AMS_USER_PAGE_SECURE_MONITOR_ADDR + dram_page_offset);
+    
+    /* Copy redirection dir out to user. */
+    memcpy((void *)((uintptr_t)user_address + sizeof(emummc_cfg->file_cfg)), emummc_cfg->emu_dir_path, sizeof(emummc_cfg->emu_dir_path));
+
     if (emummc_cfg->base_cfg.type == EMUMMC_TYPE_NONE) {
         /* Just copy base config. */
         memset(args, 0, sizeof(*args));
         memcpy(&args->X[1], emummc_cfg, sizeof(emummc_cfg->base_cfg));
         _Static_assert(sizeof(emummc_cfg->base_cfg) <= sizeof(*args) - sizeof(args->X[0]), "Emunand base config too big!");
+
+        /* Unmap pages. */
+        ams_unmap_userpage();
         return 0;
     } else if (emummc_cfg->base_cfg.type == EMUMMC_TYPE_PARTITION) {
         /* Copy base config and partition config. */
         memset(args, 0, sizeof(*args));
         memcpy(&args->X[1], emummc_cfg, sizeof(emummc_cfg->base_cfg) + sizeof(emummc_cfg->partition_cfg));
         _Static_assert(sizeof(emummc_cfg->base_cfg) + sizeof(emummc_cfg->partition_cfg) <= sizeof(*args) - sizeof(args->X[0]), "Emunand partition config too big!");
+
+        /* Unmap pages. */
+        ams_unmap_userpage();
         return 0;
     } else if (emummc_cfg->base_cfg.type == EMUMMC_TYPE_FILES) {
-        /* Copy path to userpage. */
+        /* Copy file dir path output to user. */
-        /* Initialize page reference. */
+        memcpy(user_address, &emummc_cfg->file_cfg, sizeof(emummc_cfg->file_cfg));
-        if (upage_init(&page_ref, user_address) == 0) {
-            return 2;
-        }
-        /* Copy result output back to user. */
-        if (secure_copy_to_user(&page_ref, user_address, &emummc_cfg->file_cfg, sizeof(emummc_cfg->file_cfg)) == 0) {
-            return 2;
-        }
 
         /* Copy base config afterwards, since this can't fail. */
         memset(args, 0, sizeof(*args));
         memcpy(&args->X[1], emummc_cfg, sizeof(emummc_cfg->base_cfg));
         _Static_assert(sizeof(emummc_cfg->base_cfg) <= sizeof(*args) - sizeof(args->X[0]), "Emunand base config too big!");
+
+        /* Unmap pages. */
+        ams_unmap_userpage();
         return 0;
     } else {
+        /* Unmap pages. */
+        ams_unmap_userpage();
         return 2;
     }
 }

fusee/fusee-secondary/src/emummc_cfg.h

@@ -98,9 +98,9 @@ typedef struct {
         emummc_partition_config_t partition_cfg;
         emummc_file_config_t file_cfg;
     };
-    //char emu_dir_path[EMUMMC_FILE_PATH_MAX];
+    char emu_dir_path[EMUMMC_FILE_PATH_MAX];
 } exo_emummc_config_t;
 
-_Static_assert(sizeof(exo_emummc_config_t) == 0x90, "exo_emummc_config_t definition!");
+_Static_assert(sizeof(exo_emummc_config_t) == 0x110, "exo_emummc_config_t definition!");
 
 #endif

fusee/fusee-secondary/src/nxboot.c

@@ -112,9 +112,14 @@ static int emummc_ini_handler(void *user, const char *section, const char *name,
             uintptr_t sector = 0;
             sscanf(value, "%x", &sector);
             emummc_cfg->sector = sector;
+        } else if (strcmp(name, EMUMMC_ID_KEY) == 0) {
+            sscanf(value, "%lx", &emummc_cfg->id);
         } else if (strcmp(name, EMUMMC_PATH_KEY) == 0) {
             strncpy(emummc_cfg->path, value, sizeof(emummc_cfg->path) - 1);
             emummc_cfg->path[sizeof(emummc_cfg->path) - 1]  = '\0';
+        } else if (strcmp(name, EMUMMC_NINTENDO_PATH_KEY) == 0) {
+            strncpy(emummc_cfg->nintendo_path, value, sizeof(emummc_cfg->nintendo_path) - 1);
+            emummc_cfg->nintendo_path[sizeof(emummc_cfg->nintendo_path) - 1]  = '\0';
         } else {
             return 0;
         }
@@ -209,7 +214,7 @@ static uint32_t nxboot_get_target_firmware(const void *package1loader) {
 }
 
 static bool nxboot_configure_emummc(exo_emummc_config_t *exo_emummc_config) {
-    emummc_config_t emummc_cfg = {.enabled = false, .sector = -1, .path = ""};
+    emummc_config_t emummc_cfg = {.enabled = false, .id = 0, .sector = -1, .path = "", .nintendo_path = ""};
     
     /* Load emummc settings from BCT.ini file. */
     if (ini_parse_string(get_loader_ctx()->bct0, emummc_ini_handler, &emummc_cfg) < 0) {
@@ -219,8 +224,10 @@ static bool nxboot_configure_emummc(exo_emummc_config_t *exo_emummc_config) {
     memset(exo_emummc_config, 0, sizeof(*exo_emummc_config));
     exo_emummc_config->base_cfg.magic      = MAGIC_EMUMMC_CONFIG;
     exo_emummc_config->base_cfg.type       = EMUMMC_TYPE_NONE;
-    exo_emummc_config->base_cfg.id         = 0; /* TODO: Multiple ID support. */
+    exo_emummc_config->base_cfg.id         = emummc_cfg.id;
     exo_emummc_config->base_cfg.fs_version = FS_VER_1_0_0; /* Will be filled out later. */
+    strncpy(exo_emummc_config->emu_dir_path, emummc_cfg.nintendo_path, sizeof(exo_emummc_config->emu_dir_path));
+    exo_emummc_config->emu_dir_path[sizeof(exo_emummc_config->emu_dir_path) - 1] = '\0';
     
     if (emummc_cfg.enabled) {
         if (emummc_cfg.sector >= 0) {
@@ -233,7 +240,8 @@ static bool nxboot_configure_emummc(exo_emummc_config_t *exo_emummc_config) {
             }
         } else if (is_valid_folder(emummc_cfg.path)) {
             exo_emummc_config->base_cfg.type  = EMUMMC_TYPE_FILES;
-            strncpy(exo_emummc_config->file_cfg.path, emummc_cfg.path, sizeof(exo_emummc_config->file_cfg.path) - 1);
+            strncpy(exo_emummc_config->file_cfg.path, emummc_cfg.path, sizeof(exo_emummc_config->file_cfg.path));
+            exo_emummc_config->file_cfg.path[sizeof(exo_emummc_config->file_cfg.path) - 1] = '\0';
 
             int num_parts = 0;
             uint64_t part_limit = 0;

fusee/fusee-secondary/src/nxboot.h

@@ -22,11 +22,15 @@
 #define EMUMMC_ENABLED_KEY "emummc_enabled"
 #define EMUMMC_SECTOR_KEY "emummc_sector"
 #define EMUMMC_PATH_KEY "emummc_path"
+#define EMUMMC_NINTENDO_PATH_KEY "emummc_nintendo_path"
+#define EMUMMC_ID_KEY "emummc_id"
 
 typedef struct {
     bool enabled;
+    uint32_t id;
     uint64_t sector;
-    char path[0x100];
+    char path[0x80];
+    char nintendo_path[0x80];
 } emummc_config_t;
 
 #define MAILBOX_NX_BOOTLOADER_BASE_100_620 0x40002E00

stratosphere/ams_mitm/source/fs_mitm/fsmitm_service.cpp

@@ -163,11 +163,11 @@ Result FsMitmService::OpenFileSystemWithId(Out<std::shared_ptr<IFileSystemInterf
 }
 
 Result FsMitmService::OpenSdCardFileSystem(Out<std::shared_ptr<IFileSystemInterface>> out_fs) {
-    /* We only care about redirecting this for NS/Emunand. */
+    /* We only care about redirecting this for NS/Emummc. */
-    if (!IsEmunand()) {
+    if (this->title_id != TitleId_Ns) {
         return ResultAtmosphereMitmShouldForwardToSession;
     }
-    if (this->title_id != TitleId_Ns) {
+    if (!IsEmummc()) {
         return ResultAtmosphereMitmShouldForwardToSession;
     }
 
@@ -190,7 +190,7 @@ Result FsMitmService::OpenSdCardFileSystem(Out<std::shared_ptr<IFileSystemInterf
         return rc;
     }
 
-    std::shared_ptr<IFileSystem> redir_fs = std::make_shared<DirectoryRedirectionFileSystem>(new ProxyFileSystem(sd_fs), "/Nintendo", "/Emu/0000" /* TODO: Real Path */);
+    std::shared_ptr<IFileSystem> redir_fs = std::make_shared<DirectoryRedirectionFileSystem>(new ProxyFileSystem(sd_fs), "/Nintendo", GetEmummcNintendoDirPath());
     fs = std::make_shared<IFileSystemInterface>(redir_fs);
     if (out_fs.IsDomain()) {
         out_domain_id = sd_fs.s.object_id;

stratosphere/ams_mitm/source/utils.cpp

@@ -65,6 +65,9 @@ static FsFile g_cal0_file = {0};
 static u8 g_cal0_storage_backup[ProdinfoSize];
 static u8 g_cal0_backup[ProdinfoSize];
 
+/* Emummc-related file. */
+static FsFile g_emummc_file = {0};
+
 static bool IsHexadecimal(const char *str) {
     while (*str) {
         if (isxdigit(*str)) {
@@ -197,6 +200,14 @@ void Utils::InitializeThreadFunc(void *args) {
 
     Utils::RefreshConfiguration();
     
+    /* If we're emummc, persist a write handle to prevent other processes from touching the image. */
+    if (IsEmummc()) {
+        const char *emummc_file_path = GetEmummcFilePath();
+        if (emummc_file_path != nullptr) {
+            fsFsOpenFile(&g_sd_filesystem, emummc_file_path, FS_OPEN_READ | FS_OPEN_WRITE, &g_emummc_file);
+        }
+    }
+
     /* Initialize set:sys. */
     DoWithSmSession([&]() {
         if (R_FAILED(setsysInitialize())) {

stratosphere/libstratosphere

@@ -1 +1 @@
-Subproject commit 05c58ef00263552d4925ed29ac0828cacdfc2ed1
+Subproject commit afcd075354dec43fae882c3ad4d5220336231d04