stratosphere: custom exception handlers (reboot to fusee)

Makefile

@@ -53,6 +53,7 @@ dist: all
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/titles/0100000000000036
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/titles/0100000000000034
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/titles/0100000000000032
+	mkdir -p atmosphere-$(AMSVER)/atmosphere/fatal_errors
 	cp fusee/fusee-primary/fusee-primary.bin atmosphere-$(AMSVER)/atmosphere/reboot_payload.bin
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/titles/010000000000000D
 	cp fusee/fusee-secondary/fusee-secondary.bin atmosphere-$(AMSVER)/atmosphere/fusee-secondary.bin

fusee/fusee-primary/src/main.c

@@ -90,9 +90,6 @@ static void setup_env(void) {
     /* Initialize hardware. */
     nx_hwinit();
 
-    /* Check for panics. */
-    check_and_display_panic();
-
     /* Zero-fill the framebuffer and register it as printk provider. */
     video_init(g_framebuffer);
 
@@ -139,6 +136,9 @@ int main(void) {
     /* Initialize the display, console, etc. */
     setup_env();
 
+    /* Check for panics. */
+    check_and_display_panic();
+    
     /* Load the BCT0 configuration ini off of the SD. */
     bct0 = load_config();
 

fusee/fusee-primary/src/panic.c

@@ -14,15 +14,75 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
  
+#include <stdio.h>
 #include "panic.h"
 #include "di.h"
 #include "pmc.h"
 #include "fuse.h"
 #include "utils.h"
+#include "fs_utils.h"
+#include "lib/log.h"
 
 static uint32_t g_panic_code = 0;
 
+static const char *get_error_desc_str(uint32_t error_desc) {
+    switch (error_desc) {
+        case 0x100:
+            return "Instruction Abort";
+        case 0x101:
+            return "Data Abort";
+        case 0x102:
+            return "PC Misalignment";
+        case 0x103:
+            return "SP Misalignment";
+        case 0x104:
+            return "Trap";
+        case 0x106:
+            return "SError";
+        case 0x301:
+            return "Bad SVC";
+        default:
+            return "Unknown";
+    }
+}
+
+static void _check_and_display_atmosphere_fatal_error(void) {
+    /* Check for valid magic. */
+    if (ATMOSPHERE_FATAL_ERROR_CONTEXT->magic != ATMOSPHERE_REBOOT_TO_FATAL_MAGIC) {
+        return;
+    }
+
+    {
+        /* Copy fatal error context to the stack. */
+        atmosphere_fatal_error_ctx ctx = *(ATMOSPHERE_FATAL_ERROR_CONTEXT);
+
+        /* Change magic to invalid, to prevent double-display of error/bootlooping. */
+        ATMOSPHERE_FATAL_ERROR_CONTEXT->magic = 0xCCCCCCCC;
+
+        print(SCREEN_LOG_LEVEL_ERROR | SCREEN_LOG_LEVEL_NO_PREFIX, "A fatal error occurred when running Atmosph\xe8re.\n");
+        print(SCREEN_LOG_LEVEL_ERROR | SCREEN_LOG_LEVEL_NO_PREFIX, "Title ID:   %016llx\n", ctx.title_id);
+        print(SCREEN_LOG_LEVEL_ERROR | SCREEN_LOG_LEVEL_NO_PREFIX, "Error Desc: %s (0x%x)\n", get_error_desc_str(ctx.error_desc), ctx.error_desc);
+
+        /* Save context to the SD card. */
+        {
+            char filepath[0x40];
+            snprintf(filepath, sizeof(filepath) - 1, "/atmosphere/fatal_errors/report_%016llx.bin", ctx.report_identifier);
+            filepath[sizeof(filepath)-1] = 0;
+            write_to_file(&ctx, sizeof(ctx), filepath);
+            print(SCREEN_LOG_LEVEL_ERROR | SCREEN_LOG_LEVEL_NO_PREFIX,"Report saved to %s\n", filepath);
+        }
+
+        /* Display error. */
+        print(SCREEN_LOG_LEVEL_ERROR | SCREEN_LOG_LEVEL_NO_PREFIX,"\nPress POWER to reboot\n");
+    }
+
+    wait_for_button_and_reboot();
+}
+
 void check_and_display_panic(void) {
+    /* Handle a panic sent via a stratosphere module. */
+    _check_and_display_atmosphere_fatal_error();
+    
     /* We also handle our own panics. */
     /* In the case of our own panics, we assume that the display has already been initialized. */
     bool has_panic = APBDEV_PMC_RST_STATUS_0 != 0 || g_panic_code != 0;

fusee/fusee-primary/src/panic.h

@@ -28,6 +28,35 @@
 
 #define PANIC_CODE_SAFEMODE 0x00000020
 
+/* Atmosphere reboot-to-fatal-error. */
+typedef struct {
+    uint32_t magic;
+    uint32_t error_desc;
+    uint64_t title_id;
+    union {
+        uint64_t gprs[32];
+        struct {
+            uint64_t _gprs[29];
+            uint64_t fp;
+            uint64_t lr;
+            uint64_t sp;
+        };
+    };
+    uint64_t pc;
+    uint64_t padding;
+    uint32_t pstate;
+    uint32_t afsr0;
+    uint32_t afsr1;
+    uint32_t esr;
+    uint64_t far;
+    uint64_t report_identifier; /* Normally just system tick. */
+} atmosphere_fatal_error_ctx;
+
+/* "AFE0" */
+#define ATMOSPHERE_REBOOT_TO_FATAL_MAGIC 0x30454641
+
+#define ATMOSPHERE_FATAL_ERROR_CONTEXT ((volatile atmosphere_fatal_error_ctx *)(0x4003E000))
+
 void check_and_display_panic(void);
 __attribute__ ((noreturn)) void panic(uint32_t code);
 

stratosphere/ams_mitm/ams_mitm.json

@@ -71,6 +71,7 @@
                 "svcMapDeviceAddressSpaceAligned":	"0x5a",
                 "svcUnmapDeviceAddressSpace":	"0x5c",
                 "svcGetSystemInfo":	"0x6f",
+                "svcManageNamedPort": "0x71",
                 "svcCallSecureMonitor": "0x7F"
             }
         }

stratosphere/ams_mitm/source/amsmitm_main.cpp

@@ -38,8 +38,23 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = 0x010041544D530000ul;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
 }
 
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
+}
+
+void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx) {
+    /* We're bpc-mitm (or ams_mitm, anyway), so manually reboot to fatal error. */
+    Utils::RebootToFatalError(ctx);
+}
 
 void __libnx_initheap(void) {
 	void*  addr = nx_inner_heap;

stratosphere/ams_mitm/source/bpc_mitm/bpc_ams_service.cpp

@@ -0,0 +1,32 @@
+/*
+ * 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 <mutex>
+#include <switch.h>
+#include <stratosphere.hpp>
+#include "bpc_ams_service.hpp"
+#include "bpcmitm_reboot_manager.hpp"
+
+Result BpcAtmosphereService::RebootToFatalError(InBuffer<AtmosphereFatalErrorContext> ctx) {
+    if (ctx.buffer == nullptr || ctx.num_elements != 1) {
+        return ResultKernelConnectionClosed;
+    }
+    
+    /* Reboot to fusee with the input context. */
+    BpcRebootManager::RebootForFatalError(ctx.buffer);
+    
+    return ResultSuccess;
+}

stratosphere/ams_mitm/source/bpc_mitm/bpc_ams_service.hpp

@@ -0,0 +1,34 @@
+/*
+ * 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/>.
+ */
+ 
+#pragma once
+#include <switch.h>
+#include <stratosphere.hpp>
+
+#include "../utils.hpp"
+
+enum BpcAtmosphereCmd : u32 {
+    BpcAtmosphereCmd_RebootToFatalError = 65000,
+};
+
+class BpcAtmosphereService : public IServiceObject {
+    private:
+        Result RebootToFatalError(InBuffer<AtmosphereFatalErrorContext> ctx);
+    public:
+        DEFINE_SERVICE_DISPATCH_TABLE {
+            MakeServiceCommandMeta<BpcAtmosphereCmd_RebootToFatalError, &BpcAtmosphereService::RebootToFatalError>(),
+        };
+};

stratosphere/ams_mitm/source/bpc_mitm/bpcmitm_main.cpp

@@ -25,6 +25,7 @@
 
 #include "bpcmitm_main.hpp"
 #include "bpc_mitm_service.hpp"
+#include "bpc_ams_service.hpp"
 #include "bpcmitm_reboot_manager.hpp"
 
 #include "../utils.hpp"
@@ -46,6 +47,10 @@ void BpcMitmMain(void *arg) {
     }
     AddMitmServerToManager<BpcMitmService>(server_manager, service_name, 13);
 
+    /* Extension: Allow for reboot-to-error. */
+    /* Must be managed port in order for sm to be able to access. */
+    server_manager->AddWaitable(new ManagedPortServer<BpcAtmosphereService>("bpc:ams", 1));
+
     /* Loop forever, servicing our services. */
     server_manager->Process();
     

stratosphere/ams_mitm/source/bpc_mitm/bpcmitm_reboot_manager.cpp

@@ -64,8 +64,8 @@ static void ClearIram() {
     memset(g_work_page, 0xFF, sizeof(g_work_page));
     
     /* Overwrite all of IRAM with FFs. */
-    for (size_t ofs = 0; ofs < IRAM_PAYLOAD_MAX_SIZE; ofs += sizeof(g_work_page)) {
-        CopyToIram(IRAM_PAYLOAD_BASE + ofs, g_work_page, sizeof(g_work_page));
+    for (size_t ofs = 0; ofs < IRAM_SIZE; ofs += sizeof(g_work_page)) {
+        CopyToIram(IRAM_BASE + ofs, g_work_page, sizeof(g_work_page));
     }
 }
 
@@ -99,3 +99,24 @@ Result BpcRebootManager::PerformReboot() {
             return ResultSuccess;
     }
 }
+
+void BpcRebootManager::RebootForFatalError(AtmosphereFatalErrorContext *ctx) {
+    /* If we don't actually have a payload loaded, just go to RCM. */
+    if (!g_payload_loaded) {
+        RebootToRcm();
+    }
+    
+    /* Ensure clean IRAM state. */
+    ClearIram();
+    
+    
+    /* Copy in payload. */
+    for (size_t ofs = 0; ofs < sizeof(g_reboot_payload); ofs += 0x1000) {
+        CopyToIram(IRAM_PAYLOAD_BASE + ofs, &g_reboot_payload[ofs], 0x1000);
+    }
+    
+    memcpy(g_work_page, ctx, sizeof(*ctx));
+    CopyToIram(IRAM_PAYLOAD_BASE + IRAM_PAYLOAD_MAX_SIZE, g_work_page, sizeof(g_work_page));
+    
+    RebootToIramPayload();
+}

stratosphere/ams_mitm/source/bpc_mitm/bpcmitm_reboot_manager.hpp

@@ -18,7 +18,9 @@
 #include <switch.h>
 #include <stratosphere.hpp>
 
-#define IRAM_PAYLOAD_MAX_SIZE 0x2F000
+#define IRAM_BASE             0x40000000ull
+#define IRAM_SIZE             0x40000
+#define IRAM_PAYLOAD_MAX_SIZE 0x2E000
 #define IRAM_PAYLOAD_BASE 0x40010000ull
 
 enum class BpcRebootType : u32 {
@@ -31,4 +33,5 @@ class BpcRebootManager {
     public:
         static void Initialize();
         static Result PerformReboot();
+        static void RebootForFatalError(AtmosphereFatalErrorContext *ctx);
 };

stratosphere/ams_mitm/source/utils.cpp

@@ -25,6 +25,7 @@
 #include "ini.h"
 
 #include "set_mitm/setsys_settings_items.hpp"
+#include "bpc_mitm/bpcmitm_reboot_manager.hpp"
 
 static FsFileSystem g_sd_filesystem = {0};
 static HosSignal g_sd_signal;
@@ -652,3 +653,7 @@ Result Utils::GetSettingsItemBooleanValue(const char *name, const char *key, boo
     }
     return rc;
 }
+
+void Utils::RebootToFatalError(AtmosphereFatalErrorContext *ctx) {
+    BpcRebootManager::RebootForFatalError(ctx);
+}

stratosphere/ams_mitm/source/utils.hpp

@@ -87,6 +87,9 @@ class Utils {
         static Result GetSettingsItemValue(const char *name, const char *key, void *out, size_t max_size, u64 *out_size);
 
         static Result GetSettingsItemBooleanValue(const char *name, const char *key, bool *out);
+        
+        /* Error occurred. */
+        static void RebootToFatalError(AtmosphereFatalErrorContext *ctx);
     private:
         static void RefreshConfiguration();
 };

stratosphere/boot/source/boot_main.cpp

@@ -49,6 +49,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Boot;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 void __libnx_initheap(void) {

stratosphere/creport/source/creport_main.cpp

@@ -38,6 +38,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Creport;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 

stratosphere/dmnt/source/dmnt_main.cpp

@@ -40,6 +40,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Dmnt;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 

stratosphere/eclct.stub/source/eclct_stub.cpp

@@ -35,6 +35,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Eclct;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 

stratosphere/fatal/source/fatal_main.cpp

@@ -45,6 +45,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Fatal;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 

stratosphere/libstratosphere

@@ -1 +1 @@
-Subproject commit 1f9e2d042cb028cee1777b3d63a7cda06d2cffd0
+Subproject commit b9724cdcadd5ea5fbead8f1a9c9b7de11daf6b60

stratosphere/loader/source/ldr_main.cpp

@@ -41,6 +41,16 @@ extern "C" {
     void __appInit(void);
     void __appExit(void);
 
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Loader;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 

stratosphere/pm/source/pm_main.cpp

@@ -42,6 +42,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Pm;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }
 
 

stratosphere/sm/source/sm_main.cpp

@@ -39,6 +39,17 @@ extern "C" {
     void __libnx_initheap(void);
     void __appInit(void);
     void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[0x1000];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+    u64 __stratosphere_title_id = TitleId_Sm;
+    void __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
+}
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    StratosphereCrashHandler(ctx);
 }