exo/mariko fatal: print descriptor for fatal error report

exosphere/mariko_fatal/source/fatal_display.cpp

@@ -16,6 +16,8 @@
 #include <exosphere.hpp>
 #include "fatal_device_page_table.hpp"
 #include "fatal_registers_di.hpp"
+#include "fatal_display.hpp"
+#include "fatal_print.hpp"
 
 namespace ams::secmon::fatal {
 
@@ -28,10 +30,6 @@ namespace ams::secmon::fatal {
     namespace {
 
         /* Helpful defines. */
-        constexpr size_t FrameBufferHeight = 768;
-        constexpr size_t FrameBufferWidth  = 1280;
-        constexpr size_t FrameBufferSize   = FrameBufferHeight * FrameBufferWidth * sizeof(u32);
-
         constexpr int DsiWaitForCommandMilliSecondsMax        = 250;
         constexpr int DsiWaitForCommandCompletionMilliSeconds = 5;
         constexpr int DsiWaitForHostControlMilliSecondsMax    = 150;
@@ -179,6 +177,89 @@ namespace ams::secmon::fatal {
             /* We don't actually support finalizing the framebuffer, so do nothing here. */
         }
 
+        constexpr const char *GetErrorDescription(u32 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";
+                case 0xF00:
+                    return "Kernel Panic";
+                case 0xFFD:
+                    return "Stack overflow";
+                case 0xFFE:
+                    return "std::abort() called";
+                default:
+                    return "Unknown";
+            }
+        }
+
+        void PrintSuggestedErrorFix(const ams::impl::FatalErrorContext *f_ctx) {
+            /* Try to recognize certain errors automatically, and suggest fixes for them. */
+            const char *suggestion = nullptr;
+
+            constexpr u64 ProgramIdAmsMitm = UINT64_C(0x010041544D530000);
+            constexpr u64 ProgramIdBoot    = UINT64_C(0x0100000000000005);
+            if (f_ctx->error_desc == 0xFFE) {
+                if (f_ctx->program_id == ProgramIdAmsMitm) {
+                    /* When a user has archive bits set improperly, attempting to create an automatic backup will fail */
+                    /* to create the file path with error 0x202 */
+                    if (f_ctx->gprs[0] == fs::ResultPathNotFound().GetValue()) {
+                        /* When the archive bit error is occurring, it manifests as failure to create automatic backup. */
+                        /* Thus, we can search the stack for the automatic backups path. */
+                        const char * const automatic_backups_prefix = "automatic_backups/X" /* ..... */;
+                        const int prefix_len = std::strlen(automatic_backups_prefix);
+
+                        for (size_t i = 0; i + prefix_len < f_ctx->stack_dump_size; ++i) {
+                            if (std::memcmp(&f_ctx->stack_dump[i], automatic_backups_prefix, prefix_len) == 0) {
+                                suggestion = "The atmosphere directory may improperly have archive bits set.\n"
+                                             "Please try running an archive bit fixer tool for example, the one in Hekate).\n";
+                                break;
+                            }
+                        }
+                    } else if (f_ctx->gprs[0] == fs::ResultExFatUnavailable().GetValue()) {
+                        /* When a user installs non-exFAT firm but has an exFAT formatted SD card, this error will */
+                        /* be returned on attempt to access the SD card. */
+                        suggestion = "Your console has non-exFAT firmware installed, but your SD card\n"
+                                     "is formatted as exFAT. Format your SD card as FAT32, or manually\n"
+                                     "flash exFAT firmware to package2.\n";
+                    }
+                } else if (f_ctx->program_id == ProgramIdBoot) {
+                    /* 9.x -> 10.x updated the API for SvcQueryIoMapping. */
+                    /* This can cause the kernel to reject incorrect-ABI calls by boot when a partial update is applied */
+                    /* (older kernel in package2, for some reason). */
+                    for (size_t i = 0; i < 8; ++i) {
+                        if (f_ctx->gprs[i] == svc::ResultNotFound().GetValue()) {
+                            suggestion = "A partial update may have been improperly performed.\n"
+                                         "To fix, try manually flashing latest package2 to MMC.\n"
+                                         "\n"
+                                         "For help doing this, seek support in the ReSwitched or\n"
+                                         "Nintendo Homebrew discord servers.\n";
+                            break;
+                        }
+                    }
+                }
+            } else if (f_ctx->error_desc == 0xF00) { /* Kernel Panic */
+                suggestion = "Please contact SciresM#0524 on Discord, or create an issue on the Atmosphere\n"
+                             "GitHub issue tracker. Thank you very much for helping to test mesosphere.\n";
+            }
+
+            /* If we found a suggestion, print it. */
+            if (suggestion != nullptr) {
+                Print("%s", suggestion);
+            }
+        }
+
     }
 
     void FinalizeDisplay() {
@@ -425,20 +506,26 @@ namespace ams::secmon::fatal {
     }
 
     void ShowDisplay(const ams::impl::FatalErrorContext *f_ctx, const Result save_result) {
-        /* Draw the image to the screen. */
-        std::memset(g_frame_buffer, 0, FrameBufferSize);
+        /* Initialize the console. */
+        InitializeConsole(g_frame_buffer);
         {
-            /* TODO: Actually print the contents of the report. */
-            AMS_UNUSED(f_ctx, save_result);
-            for (size_t n = 0; n < 8; n++) {
-                const size_t x = n * (FrameBufferWidth / 8);
-                for (size_t cur_y = 0; cur_y < FrameBufferHeight; cur_y++) {
-                    for (size_t cur_x = 0; cur_x < (FrameBufferWidth / 8); cur_x++) {
-                        g_frame_buffer[(FrameBufferWidth - (x + cur_x)) * FrameBufferHeight + 0 + cur_y] = ((0x20 * n) | 0x1F);
-                    }
-                }
+            Print("%s\n", "A fatal error occurred when running Atmosph\xe8re.");
+            Print("Program ID: %016" PRIx64 "\n", f_ctx->program_id);
+            Print("Error Desc: %s (0x%x)\n", GetErrorDescription(f_ctx->error_desc), f_ctx->error_desc);
+            Print("\n");
+
+            if (R_SUCCEEDED(save_result)) {
+                Print("Report saved to /atmosphere/fatal_errors/report_%016" PRIx64 ".bin", f_ctx->report_identifier);
+            } else {
+                Print("Failed to save report to the SD card! (%08x)\n", save_result.GetValue());
             }
+
+            PrintSuggestedErrorFix(f_ctx);
+
+            Print("\nPress POWER to reboot.\n");
         }
+
+        /* Ensure the device will see consistent data. */
         hw::FlushDataCache(g_frame_buffer, FrameBufferSize);
 
         /* Enable backlight. */

exosphere/mariko_fatal/source/fatal_display.hpp

@@ -18,6 +18,10 @@
 
 namespace ams::secmon::fatal {
 
+    constexpr inline size_t FrameBufferHeight = 768;
+    constexpr inline size_t FrameBufferWidth  = 1280;
+    constexpr inline size_t FrameBufferSize   = FrameBufferHeight * FrameBufferWidth * sizeof(u32);
+
     void InitializeDisplay();
     void ShowDisplay(const ams::impl::FatalErrorContext *f_ctx, const Result save_result);
     void FinalizeDisplay();

exosphere/mariko_fatal/source/fatal_print.cpp

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2018-2020 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 <exosphere.hpp>
+#include "fatal_display.hpp"
+#include "fatal_print.hpp"
+
+namespace ams::secmon::fatal {
+
+    namespace {
+
+        #include "fatal_font.inc"
+
+        constexpr inline const u32 TextColor = 0xFFA0A0A0;
+
+        constexpr inline const size_t ConsoleWidth  = FrameBufferWidth  / FontWidth;
+        constexpr inline const size_t ConsoleHeight = FrameBufferHeight / FontHeight;
+
+        constinit u32 *g_frame_buffer = nullptr;
+        constinit size_t g_col = 1;
+        constinit size_t g_row = 0;
+
+        void SetPixel(size_t x, size_t y, u32 color) {
+            g_frame_buffer[(FrameBufferWidth - x) * FrameBufferHeight + y] = color;
+        }
+
+        void PutCarriageReturn() {
+            g_col = 1;
+        }
+
+        void PutNewLine() {
+            g_col = 1;
+            ++g_row;
+
+            /* TODO: Support scrolling? */
+        }
+
+        void PutCharImpl(const char c) {
+            /* Get the character data for the font. */
+            const u8 * cdata = FontData + c * (FontHeight * util::DivideUp(FontWidth, BITSIZEOF(u8)));
+
+            /* Determine where to start drawing. */
+            const size_t x = g_col * FontWidth;
+            const size_t y = g_row * FontHeight;
+
+            for (size_t cur_y = 0; cur_y < FontHeight; ++cur_y) {
+                size_t cur_x = 0;
+                int wbits = FontWidth;
+                while (wbits > 0) {
+                    const auto bits = *(cdata++);
+
+                    SetPixel(x + cur_x + 0, y + cur_y, FontDrawTable[(bits >> 4) & 0xF][0] & TextColor);
+                    SetPixel(x + cur_x + 1, y + cur_y, FontDrawTable[(bits >> 4) & 0xF][1] & TextColor);
+                    SetPixel(x + cur_x + 2, y + cur_y, FontDrawTable[(bits >> 4) & 0xF][2] & TextColor);
+                    SetPixel(x + cur_x + 3, y + cur_y, FontDrawTable[(bits >> 4) & 0xF][3] & TextColor);
+                    SetPixel(x + cur_x + 4, y + cur_y, FontDrawTable[(bits >> 0) & 0xF][0] & TextColor);
+                    SetPixel(x + cur_x + 5, y + cur_y, FontDrawTable[(bits >> 0) & 0xF][1] & TextColor);
+                    SetPixel(x + cur_x + 6, y + cur_y, FontDrawTable[(bits >> 0) & 0xF][2] & TextColor);
+                    SetPixel(x + cur_x + 7, y + cur_y, FontDrawTable[(bits >> 0) & 0xF][3] & TextColor);
+
+                    cur_x += BITSIZEOF(u8);
+                    wbits -= BITSIZEOF(u8);
+                }
+            }
+        }
+
+        void PutChar(const char c) {
+            switch (c) {
+                case '\r':
+                    PutCarriageReturn();
+                    break;
+                case '\n':
+                    PutNewLine();
+                    break;
+                default:
+                    PutCharImpl(c);
+                    if ((++g_col) >= ConsoleWidth) {
+                        PutNewLine();
+                    }
+            }
+        }
+
+    }
+
+    void InitializeConsole(u32 *frame_buffer) {
+        /* Setup the console variables. */
+        g_frame_buffer = frame_buffer;
+        g_col          = 1;
+        g_row          = 0;
+
+        /* Clear the console. */
+        std::memset(g_frame_buffer, 0, FrameBufferSize);
+    }
+
+    void Print(const char *fmt, ...) {
+        /* Generate the string. */
+        char log_str[1_KB];
+        {
+            std::va_list vl;
+            va_start(vl, fmt);
+            util::TVSNPrintf(log_str, sizeof(log_str), fmt, vl);
+            va_end(vl);
+        }
+
+        /* Print each character. */
+        const size_t len = std::strlen(log_str);
+        for (size_t i = 0; i < len; ++i) {
+            PutChar(log_str[i]);
+        }
+
+        /* Flush the console. */
+        hw::FlushDataCache(g_frame_buffer, FrameBufferSize);
+    }
+
+}

exosphere/mariko_fatal/source/fatal_print.hpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018-2020 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 <exosphere.hpp>
+
+namespace ams::secmon::fatal {
+
+    void InitializeConsole(u32 *frame_buffer);
+    void Print(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
+
+}

libraries/libvapours/include/vapours/results/fs_results.hpp

@@ -257,6 +257,7 @@ namespace ams::fs {
                 R_DEFINE_ERROR_RESULT(GptHeaderVerificationFailed, 4662);
 
             R_DEFINE_ERROR_RANGE(FatFileSystemCorrupted, 4681, 4699);
+                R_DEFINE_ERROR_RESULT(ExFatUnavailable, 4685);
 
             R_DEFINE_ERROR_RANGE(HostFileSystemCorrupted, 4701, 4719);
                 R_DEFINE_ERROR_RESULT(HostEntryCorrupted,    4702);