306 lines
8.7 KiB
C++
306 lines
8.7 KiB
C++
/*
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* main.cpp
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* MontaukOS Crashpad - renders process crash information
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* Copyright (c) 2026 Daniel Hammer
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*/
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#include <montauk/syscall.h>
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#include <montauk/heap.h>
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#include <montauk/string.h>
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#include <gui/standalone.hpp>
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#include <gui/gui.hpp>
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#include <gui/font.hpp>
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using namespace gui;
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static bool is_desktop_running() {
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static montauk::abi::ProcInfo procs[256];
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int count = montauk::proclist(procs, 256);
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if (count <= 0) return false;
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int self_pid = montauk::getpid();
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for (int i = 0; i < count; i++) {
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if (montauk::streq(procs[i].name, "0:/os/desktop.elf")) {
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return true;
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}
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}
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return false;
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}
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static constexpr int WINDOW_W = 460;
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static constexpr int WINDOW_H = 480;
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static constexpr int PADDING = 12;
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static constexpr int HEADER_H = 48;
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static constexpr int COL1_W = 200;
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static constexpr int SECTION_GAP = 10;
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WsWindow g_win;
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montauk::abi::CrashReportInfo g_report = {};
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int g_scroll = 0;
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// Colors - light theme matching DiskDetail
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static constexpr Color BG = Color::from_rgb(0xFF, 0xFF, 0xFF);
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static constexpr Color ROW_EVEN = Color::from_rgb(0xF7, 0xF7, 0xF7);
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static constexpr Color ACCENT = Color::from_rgb(0x33, 0x66, 0xCC);
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static constexpr Color BORDER = Color::from_rgb(0xE0, 0xE0, 0xE0);
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static constexpr Color TEXT_COLOR = Color::from_rgb(0x22, 0x22, 0x22);
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static constexpr Color DIM_TEXT = Color::from_rgb(0x66, 0x66, 0x66);
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static constexpr Color VALUE_COL = Color::from_rgb(0x22, 0x22, 0x22);
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// Custom hex formatter (avoids snprintf which isn't in freestanding libc)
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static void format_hex16(char* out, uint64_t val) {
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out[0] = '0';
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out[1] = 'x';
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static const char hex[] = "0123456789ABCDEF";
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for (int i = 0; i < 16; i++) {
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out[2 + i] = hex[(val >> (60 - i * 4)) & 0xF];
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}
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out[18] = '\0';
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}
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static void format_decimal(char* out, int val) {
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if (val == 0) {
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out[0] = '0';
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out[1] = '\0';
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return;
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}
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if (val < 0) {
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*out++ = '-';
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val = -val;
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}
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char tmp[16];
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int i = 0;
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while (val > 0) {
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tmp[i++] = '0' + (val % 10);
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val /= 10;
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}
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while (i > 0) {
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*out++ = tmp[--i];
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}
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*out = '\0';
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}
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// Draw a section header label + horizontal rule
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static void section_header(Canvas& c, int& y, int w, int fh, const char* label) {
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if (y < -fh - 8 || y > c.h + fh + 8) {
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y += fh + 8;
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return;
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}
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c.text(PADDING, y, label, ACCENT);
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y += fh;
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c.hline(PADDING, y, w - PADDING * 2, BORDER);
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y += 2;
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}
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// Draw one alternating table row (key left, value right)
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static void table_row(Canvas& c, int& y, int row_h, int col1_w, int w,
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int rowIdx, const char* key, const char* val, Color val_col) {
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if (y > c.h + row_h || y < -row_h) {
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y += row_h;
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return;
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}
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if (rowIdx % 2 == 0)
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c.fill_rect(PADDING, y, w - PADDING * 2, row_h, ROW_EVEN);
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int ty = y + (row_h - system_font_height()) / 2;
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c.text(PADDING + 8, ty, key, DIM_TEXT);
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c.text(PADDING + col1_w + 8, ty, val, val_col);
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y += row_h;
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}
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static void render() {
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if (g_win.id < 0) return;
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Canvas c = g_win.canvas();
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c.fill(BG);
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int fh = system_font_height();
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int row_h = fh + 8;
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int w = g_win.width;
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int y = PADDING - g_scroll;
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int rowIdx = 0;
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// Process info header (outside table)
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if (y >= -fh * 2 && y < c.h + fh) {
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char buf[128];
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char* p = buf;
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// Process name (large, white)
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const char* name = g_report.processName;
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while (*name) *p++ = *name++;
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*p++ = ' ';
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*p++ = '(';
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*p++ = 'P';
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*p++ = 'I';
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*p++ = 'D';
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*p++ = ' ';
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format_decimal(p, g_report.pid);
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while (*p) p++;
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*p++ = ')';
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*p = '\0';
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c.text(PADDING, y, buf, TEXT_COLOR);
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y += fh + 4;
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// Exception name below
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char excbuf[64];
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p = excbuf;
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const char* exc = g_report.exceptionName;
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while (*exc) *p++ = *exc++;
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*p++ = ' ';
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*p++ = '(';
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*p++ = 'v';
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*p++ = 'e';
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*p++ = 'c';
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*p++ = 't';
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*p++ = 'o';
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*p++ = 'r';
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*p++ = ' ';
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*p++ = '0';
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*p++ = 'x';
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static const char hex[] = "0123456789ABCDEF";
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*p++ = hex[(g_report.exceptionVector >> 4) & 0xF];
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*p++ = hex[g_report.exceptionVector & 0xF];
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*p++ = ')';
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*p++ = '\0';
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c.text(PADDING, y, excbuf, DIM_TEXT);
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y += fh;
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} else {
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y += fh + 4 + fh;
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}
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y += SECTION_GAP;
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// Registers section
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section_header(c, y, w, fh, "Registers");
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char hexbuf[32];
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auto draw_hex_row = [&](const char* key, uint64_t val) {
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format_hex16(hexbuf, val);
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table_row(c, y, row_h, COL1_W, w, rowIdx++, key, hexbuf, VALUE_COL);
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};
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draw_hex_row("Instruction Pointer", g_report.instructionPointer);
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draw_hex_row("Code Segment", g_report.codeSegment);
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draw_hex_row("Flags", g_report.flags);
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draw_hex_row("Stack Pointer", g_report.stackPointer);
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draw_hex_row("Stack Segment", g_report.stackSegment);
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y += SECTION_GAP;
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// Page Fault section (only for vector 0x0E)
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if (g_report.exceptionVector == 0x0E) {
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section_header(c, y, w, fh, "Page Fault");
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format_hex16(hexbuf, g_report.faultingAddress);
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table_row(c, y, row_h, COL1_W, w, rowIdx++, "Faulting Address (CR2)", hexbuf,
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TEXT_COLOR);
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// Error code bits
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auto draw_pf_bit = [&](const char* label, bool val) {
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Color col = val ? Color::from_rgb(0x22, 0x88, 0x22) : Color::from_rgb(0xAA, 0xAA, 0xAA);
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table_row(c, y, row_h, COL1_W, w, rowIdx++, label, val ? "1" : "0", col);
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};
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draw_pf_bit("Present", g_report.pfPresent);
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draw_pf_bit("Write", g_report.pfWrite);
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draw_pf_bit("User", g_report.pfUser);
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draw_pf_bit("Reserved Write", g_report.pfReservedWrite);
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draw_pf_bit("Instruction Fetch", g_report.pfInstructionFetch);
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draw_pf_bit("Protection Key", g_report.pfProtectionKey);
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draw_pf_bit("Shadow Stack", g_report.pfShadowStack);
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draw_pf_bit("SGX", g_report.pfSGX);
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y += SECTION_GAP;
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}
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g_win.present();
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}
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// ==== Console (no-desktop) crash report ====
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// When no desktop is running, the crashpad is spawned with its stdout
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// redirected to the same out-stream as the crashed process (wired up by the
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// kernel in SpawnCrashPad), so montauk::print() lands in the console terminal.
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static void emit(const char* s) { montauk::print(s); }
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static void emit_kv_hex(const char* key, uint64_t val) {
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char buf[32];
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emit(" ");
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emit(key);
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emit(": ");
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format_hex16(buf, val);
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emit(buf);
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emit("\n");
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}
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static void render_console() {
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char num[16];
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emit("\n\033[1;31m*** Process crashed ***\033[0m\n");
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emit("Process: ");
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emit(g_report.processName);
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emit(" (pid ");
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format_decimal(num, g_report.pid);
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emit(num);
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emit(")\n");
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emit("Exception: ");
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emit(g_report.exceptionName);
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emit("\n");
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emit_kv_hex("RIP", g_report.instructionPointer);
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emit_kv_hex("RSP", g_report.stackPointer);
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emit_kv_hex("RFLAGS", g_report.flags);
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if (g_report.exceptionVector == 0x0E)
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emit_kv_hex("CR2 (fault addr)", g_report.faultingAddress);
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emit("\n");
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}
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extern "C" void _start() {
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fonts::init();
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// Poll for crash report
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int available = montauk::crash_report(&g_report);
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if (available <= 0) montauk::exit(1);
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if (is_desktop_running()) {
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if (!g_win.create("Process Crashed", WINDOW_W, WINDOW_H)) montauk::exit(1);
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render();
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while (true) {
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montauk::abi::WinEvent ev;
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int r = g_win.poll(&ev);
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if (r < 0) break;
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if (r == 0) {
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montauk::sleep_ms(16);
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continue;
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}
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if (ev.type == 3) break; // close
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if (ev.type == 0 && ev.key.pressed) {
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if (ev.key.scancode == 0x01) break; // Escape
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if (ev.key.scancode == 0x51) {
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// Page Down: scroll down
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g_scroll += 60;
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render();
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}
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if (ev.key.scancode == 0x49) {
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// Page Up: scroll up
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g_scroll -= 60;
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if (g_scroll < 0) g_scroll = 0;
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render();
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}
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}
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if (ev.type == 2) {
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// Resize
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render();
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}
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}
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g_win.destroy();
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} else {
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// No desktop: print a textual report to the redirected console.
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render_console();
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}
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montauk::exit(0);
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}
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