BSoD

limine.conf

@@ -3,8 +3,6 @@ timeout: 3
 # Graphics mode and Splash screen
 term_palette: ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff;ffffff
 term_background: #00000000
-# Hide terminal by placing it out of view or making it very small initially if possible, 
-# but Limine's wallapper will be the main background.
 wallpaper: boot():/splash.jpg
 
 /BoredOS

src/kernel/cli_apps/cli_apps.h

@@ -18,6 +18,7 @@ void cli_cmd_boredver(char *args);
 void cli_cmd_clear(char *args);
 void cli_cmd_exit(char *args);
 
+
 // Filesystem commands
 void cli_cmd_cd(char *args);
 void cli_cmd_pwd(char *args);

src/kernel/cmd.c

@@ -361,7 +361,6 @@ void pager_wrap_content(const char **lines, int count) {
             pager_total_lines++;
             processed += chunk_len;
             
-            // Skip the space we just split on
             if (processed < len && line[processed] == ' ') {
                 processed++;
             }
@@ -425,7 +424,6 @@ static void internal_cmd_cd(char *args) {
     }
     path[i] = 0;
     
-    // For cmd_state, we need to build and validate the full path
     if (cmd_state) {
         // Build full path for validation
         char full_path[512] = {0};
@@ -942,9 +940,7 @@ static void cmd_exec_single(char *cmd) {
         
         if (needs_path) {
             if (args && args[0]) {
-                // For echo with redirection, we need to prepend drive to redirect target too
                 if (is_echo_command) {
-                    // Find > or >> and prepend drive to the filename after it
                     char temp_args[512] = {0};
                     int i = 0;
                     int j = 0;

src/kernel/disk_manager.c

@@ -112,7 +112,7 @@ static int ata_identify(uint16_t port_base, bool slave) {
     // Read 256 words (512 bytes) of identity data
     for (int i = 0; i < 256; i++) {
         uint16_t data = inw(port_base + ATA_REG_DATA);
-        (void)data; // We discard identity data for now, just checking presence
+        (void)data;
     }
     
     return 1;

src/kernel/fat32.c

@@ -5,8 +5,6 @@
 #include <stdbool.h>
 #include <stddef.h>
 
-// === RAMFS Implementation (Drive A:) ===
-// We keep the original logic for Drive A to preserve existing OS functionality.
 
 #define MAX_FILES 256
 #define MAX_CLUSTERS 1024
@@ -149,17 +147,14 @@ static char parse_drive_from_path(const char **path_ptr) {
 
 // Normalize path (remove .., ., etc)
 void fat32_normalize_path(const char *path, char *normalized) {
-    // Basic normalization
+
-    // If we have a drive letter, strip it for internal processing logic if needed,
-    // but the output 'normalized' should conceptually be the path *on that drive*.
     
     char temp[FAT32_MAX_PATH];
     int temp_len = 0;
     const char *p = path;
     char drive = parse_drive_from_path(&p);
     
-    // Initialize with current directory or root
+
-    // If drive changed, we assume root of that drive
     if (p[0] == '/') {
         fs_strcpy(temp, "/");
         temp_len = 1;
@@ -632,7 +627,6 @@ static FAT32_FileHandle* realfs_open(char drive, const char *path, const char *m
         }
         
         if (!found) {
-            // Check if we want to create file
             if ((mode[0] == 'w' || mode[0] == 'a') && *p == 0) {
                  // Create file logic
                  char dos_name[11];
@@ -1030,7 +1024,6 @@ static bool realfs_delete(char drive, const char *path) {
         if (*p == 0) break; // End of path
     }
     
-    // We found the file entry - now delete it
     
     // 1. Mark directory entry as deleted
     uint8_t *entry_buf = (uint8_t*)kmalloc(512);
@@ -1090,16 +1083,11 @@ static int realfs_list_directory(char drive, const char *path, FAT32_FileInfo *e
     }
     FAT32_Volume *vol = &volumes[vol_idx];
     
-    // Find directory start cluster
+
-    // Reuse realfs_open logic basically to find the cluster
-    // but without creating a handle.
-    // For simplicity, just use realfs_open and then read the directory entries
     FAT32_FileHandle *dir_handle = realfs_open(drive, path, "r");
     if (!dir_handle) return 0;
     
-    // Extract start_cluster BEFORE closing the handle
     uint32_t current_cluster = dir_handle->start_cluster;
-    // We don't use the handle for reading via realfs_read because directories are special
     fat32_close(dir_handle); // Return to pool - this invalidates the handle
     
     int count = 0;
@@ -1236,9 +1224,7 @@ void fat32_close(FAT32_FileHandle *handle) {
                              entry->start_cluster_high = (handle->start_cluster >> 16);
                              entry->start_cluster_low = (handle->start_cluster & 0xFFFF);
                          }
-                         // Write back with error checking
                          if (d->write_sector(d, handle->dir_sector, buf) != 0) {
-                             // Write failed - at least we tried
                          }
                      }
                      kfree(buf);
@@ -1506,26 +1492,13 @@ bool fat32_is_directory(const char *path) {
     } else {
         FAT32_FileHandle *fh = realfs_open(drive, p, "r");
         if (fh) {
-            // Wait, open checks if file/dir. 
+       
-            // We need to check if what we opened is a directory.
-            // realfs_open returns handle for directory too if strictly reading?
-            // Actually my realfs_open logic tries to find the entry.
-            // If it returns a handle, how do we know if it was a dir?
-            // Handle doesn't store attributes.
-            // But we can check if size == 0 (often for dirs) or inferred from how we opened it.
-            // Better: use realfs_list_directory check or modify open to return attributes?
-            // For now, let's assume if we can open it and it has size 0 (or we opened root), it's dir.
-            // This is imperfect.
-            // Correct way: Add attributes to FAT32_FileHandle or separate check function.
-            // Let's rely on naming convention or just return false for now if not root.
             if (fs_strcmp(p, "/") == 0 || fs_strcmp(p, "") == 0) is_dir = true;
             else {
-                 // Hack: check if list_directory returns > 0 entries? No empty dirs exists.
+
-                 // We need to improve realfs_open to store attr.
             }
             fat32_close(fh);
         }
-        // Workaround: assume true if path ends in /? No.
     }
     
     asm volatile("push %0; popfq" : : "r"(rflags));
@@ -1586,23 +1559,15 @@ bool fat32_chdir(const char *path) {
          }
     }
     
-    // Change dir on current drive
     if (fat32_is_directory(path)) {
-         // Normalize and set
          if (drive == 'A') {
              char normalized[FAT32_MAX_PATH];
              fat32_normalize_path(p, normalized);
              fs_strcpy(current_dir, normalized);
          } else {
-             // For real drive, just store path
-             // Need a way to validate path exists on real drive first
-             // fat32_is_directory call above should suffice?
-             // But my realfs is_directory is weak.
              fs_strcpy(current_dir, p); 
-             // Ensure leading slash
              if (current_dir[0] != '/') {
-                 // Prepend /
+
-                 // ... (skip for brevity, assume absolute paths mostly)
              }
          }
          asm volatile("push %0; popfq" : : "r"(rflags));

src/kernel/idt.c

@@ -3,7 +3,7 @@
 
 extern void serial_write(const char *str);
 
-// Simple hex printer for debugging exceptions
+// Simple hex printer for debugging
 static void print_hex(uint64_t val) {
     const char* digits = "0123456789ABCDEF";
     char buf[17];
@@ -19,40 +19,64 @@ static void print_hex(uint64_t val) {
 #include "process.h"
 #include "cmd.h"
 
+void kernel_panic(registers_t *regs, const char *error_name);
+
+static const char *exception_messages[] = {
+    "Division By Zero",
+    "Debug",
+    "Non-Maskable Interrupt",
+    "Breakpoint",
+    "Into Detected Overflow",
+    "Out of Bounds",
+    "Invalid Opcode",
+    "No Coprocessor",
+    "Double Fault",
+    "Coprocessor Segment Overrun",
+    "Bad TSS",
+    "Segment Not Present",
+    "Stack Fault",
+    "General Protection Fault",
+    "Page Fault",
+    "Unknown Interrupt",
+    "Coprocessor Fault",
+    "Alignment Check",
+    "Machine Check",
+    "SIMD Floating-Point Exception",
+    "Virtualization Exception",
+    "Control Protection Exception",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Hypervisor Injection Exception",
+    "VMM Communication Exception",
+    "Security Exception",
+    "Reserved"
+};
+
 uint64_t exception_handler_c(registers_t *regs) {
     uint64_t vector = regs->int_no;
-    uint64_t rip = regs->rip;
-    uint64_t cr2;
-    asm volatile("mov %%cr2, %0" : "=r"(cr2));
     
+    // Serial Mirror
     serial_write("\n*** EXCEPTION ***\nVector: ");
     print_hex(vector);
-    serial_write("\nError Code: ");
-    print_hex(regs->err_code);
-    serial_write("\nRIP: ");
-    print_hex(rip);
-    serial_write("\nCR2: ");
-    print_hex(cr2);
     
-    // Mirror to shell
-    if (cmd_get_cursor_col() != 0) cmd_write("\n");
-    cmd_write("*** EXCEPTION ***\nVector: "); cmd_write_hex(vector);
-    cmd_write("\nError Code: "); cmd_write_hex(regs->err_code);
-    cmd_write("\nRIP: "); cmd_write_hex(rip);
-    cmd_write("\nCR2: "); cmd_write_hex(cr2);
-    cmd_write("\n");
-
-    // Filter by CS selector to check if we are in user mode (RPL=3)
     if ((regs->cs & 0x3) != 0) {
         serial_write("\nUSER MODE EXCEPTION - Terminating process.\n");
-        cmd_write("USER MODE EXCEPTION - Terminating process.\n");
+        if (cmd_get_cursor_col() != 0) cmd_write("\n");
+        cmd_write("*** USER EXCEPTION ***\nVector: "); cmd_write_hex(vector);
+        cmd_write("\nRIP: "); cmd_write_hex(regs->rip);
+        cmd_write("\nTerminating process.\n");
         return process_terminate_current();
     }
 
-    serial_write("\nKERNEL PANIC - CPU HALTED.\n");
+    // Kernel mode exception
-    cmd_write("KERNEL PANIC - CPU HALTED.\n");
+    const char *name = (vector < 32) ? exception_messages[vector] : "Unknown Kernel Exception";
-    while(1) { asm volatile("cli; hlt"); }
+    kernel_panic(regs, name);
-    return (uint64_t)regs; // Unreachable but for completeness
+    
+    return (uint64_t)regs; // Unreachable
 }
 
 #define IDT_ENTRIES 256
@@ -145,10 +169,72 @@ void idt_register_interrupts(void) {
     idt_set_gate(44, isr12_wrapper, cs, 0x8E); // Mouse (IRQ 12)
 
     // Exceptions
-    extern void isr8_wrapper(void);
+    extern void exc0_wrapper(void);
-    extern void isr14_wrapper(void);
+    extern void exc1_wrapper(void);
-    idt_set_gate(8, isr8_wrapper, cs, 0x8E);  // Double Fault
+    extern void exc2_wrapper(void);
-    idt_set_gate(14, isr14_wrapper, cs, 0x8E); // Page Fault
+    extern void exc3_wrapper(void);
+    extern void exc4_wrapper(void);
+    extern void exc5_wrapper(void);
+    extern void exc6_wrapper(void);
+    extern void exc7_wrapper(void);
+    extern void exc8_wrapper(void);
+    extern void exc9_wrapper(void);
+    extern void exc10_wrapper(void);
+    extern void exc11_wrapper(void);
+    extern void exc12_wrapper(void);
+    extern void exc13_wrapper(void);
+    extern void exc14_wrapper(void);
+    extern void exc15_wrapper(void);
+    extern void exc16_wrapper(void);
+    extern void exc17_wrapper(void);
+    extern void exc18_wrapper(void);
+    extern void exc19_wrapper(void);
+    extern void exc20_wrapper(void);
+    extern void exc21_wrapper(void);
+    extern void exc22_wrapper(void);
+    extern void exc23_wrapper(void);
+    extern void exc24_wrapper(void);
+    extern void exc25_wrapper(void);
+    extern void exc26_wrapper(void);
+    extern void exc27_wrapper(void);
+    extern void exc28_wrapper(void);
+    extern void exc29_wrapper(void);
+    extern void exc30_wrapper(void);
+    extern void exc31_wrapper(void);
+
+    idt_set_gate(0,  exc0_wrapper,  cs, 0x8E);
+    idt_set_gate(1,  exc1_wrapper,  cs, 0x8E);
+    idt_set_gate(2,  exc2_wrapper,  cs, 0x8E);
+    idt_set_gate(3,  exc3_wrapper,  cs, 0x8E);
+    idt_set_gate(4,  exc4_wrapper,  cs, 0x8E);
+    idt_set_gate(5,  exc5_wrapper,  cs, 0x8E);
+    idt_set_gate(6,  exc6_wrapper,  cs, 0x8E);
+    idt_set_gate(7,  exc7_wrapper,  cs, 0x8E);
+    idt_set_gate(8,  exc8_wrapper,  cs, 0x8E);
+    idt_set_gate(9,  exc9_wrapper,  cs, 0x8E);
+    idt_set_gate(10, exc10_wrapper, cs, 0x8E);
+    idt_set_gate(11, exc11_wrapper, cs, 0x8E);
+    idt_set_gate(12, exc12_wrapper, cs, 0x8E);
+    idt_set_gate(13, exc13_wrapper, cs, 0x8E);
+    idt_set_gate(14, exc14_wrapper, cs, 0x8E);
+    idt_set_gate(15, exc15_wrapper, cs, 0x8E);
+    idt_set_gate(16, exc16_wrapper, cs, 0x8E);
+    idt_set_gate(17, exc17_wrapper, cs, 0x8E);
+    idt_set_gate(18, exc18_wrapper, cs, 0x8E);
+    idt_set_gate(19, exc19_wrapper, cs, 0x8E);
+    idt_set_gate(20, exc20_wrapper, cs, 0x8E);
+    idt_set_gate(21, exc21_wrapper, cs, 0x8E);
+    idt_set_gate(22, exc22_wrapper, cs, 0x8E);
+    idt_set_gate(23, exc23_wrapper, cs, 0x8E);
+    idt_set_gate(24, exc24_wrapper, cs, 0x8E);
+    idt_set_gate(25, exc25_wrapper, cs, 0x8E);
+    idt_set_gate(26, exc26_wrapper, cs, 0x8E);
+    idt_set_gate(27, exc27_wrapper, cs, 0x8E);
+    idt_set_gate(28, exc28_wrapper, cs, 0x8E);
+    idt_set_gate(29, exc29_wrapper, cs, 0x8E);
+    idt_set_gate(30, exc30_wrapper, cs, 0x8E);
+    idt_set_gate(31, exc31_wrapper, cs, 0x8E);
+
 }
 
 void idt_load(void) {

src/kernel/interrupts.asm

@@ -74,28 +74,66 @@ isr1_wrapper:
 isr12_wrapper:
     ISR_NOERRCODE mouse_handler, 44
 
-; Common exception macro
+; Common exception macro for exceptions WITHOUT error code
-%macro EXCEPTION_ERRCODE 1
+%macro EXCEPTION_NOERRCODE 1
-isr%1_wrapper:
+global exc%1_wrapper
-    push %1
+exc%1_wrapper:
+    push 0      ; Dummy error code
+    push %1     ; Vector
     jmp exception_common
 %endmacro
 
-; Exception 8: Double Fault (has error code)
+; Common exception macro for exceptions WITH error code
-EXCEPTION_ERRCODE 8
+%macro EXCEPTION_ERRCODE 1
+global exc%1_wrapper
+exc%1_wrapper:
+    push %1     ; Vector
+    jmp exception_common
+%endmacro
 
-; Exception 14: Page Fault (has error code)
+; Define all 32 standard exceptions
-EXCEPTION_ERRCODE 14
+EXCEPTION_NOERRCODE 0  ; Divide Error
+EXCEPTION_NOERRCODE 1  ; Debug
+EXCEPTION_NOERRCODE 2  ; NMI
+EXCEPTION_NOERRCODE 3  ; Breakpoint
+EXCEPTION_NOERRCODE 4  ; Overflow
+EXCEPTION_NOERRCODE 5  ; Bound Range Exceeded
+EXCEPTION_NOERRCODE 6  ; Invalid Opcode
+EXCEPTION_NOERRCODE 7  ; Device Not Available
+EXCEPTION_ERRCODE   8  ; Double Fault
+EXCEPTION_NOERRCODE 9  ; Coprocessor Segment Overrun
+EXCEPTION_ERRCODE   10 ; Invalid TSS
+EXCEPTION_ERRCODE   11 ; Segment Not Present
+EXCEPTION_ERRCODE   12 ; Stack-Segment Fault
+EXCEPTION_ERRCODE   13 ; General Protection Fault
+EXCEPTION_ERRCODE   14 ; Page Fault
+EXCEPTION_NOERRCODE 15 ; Reserved
+EXCEPTION_NOERRCODE 16 ; x87 Floating-Point Exception
+EXCEPTION_ERRCODE   17 ; Alignment Check
+EXCEPTION_NOERRCODE 18 ; Machine Check
+EXCEPTION_NOERRCODE 19 ; SIMD Floating-Point Exception
+EXCEPTION_NOERRCODE 20 ; Virtualization Exception
+EXCEPTION_ERRCODE   21 ; Control Protection Exception
+EXCEPTION_NOERRCODE 22 ; Reserved
+EXCEPTION_NOERRCODE 23 ; Reserved
+EXCEPTION_NOERRCODE 24 ; Reserved
+EXCEPTION_NOERRCODE 25 ; Reserved
+EXCEPTION_NOERRCODE 26 ; Reserved
+EXCEPTION_NOERRCODE 27 ; Reserved
+EXCEPTION_NOERRCODE 28 ; Hypervisor Injection Exception
+EXCEPTION_ERRCODE   29 ; VMM Communication Exception
+EXCEPTION_ERRCODE   30 ; Security Exception
+EXCEPTION_NOERRCODE 31 ; Reserved
 
 exception_common:
-    ; Save registers
+    ; Save registers (registers_t structure)
     push rax
+    push rbx
     push rcx
     push rdx
-    push rbx
     push rbp
-    push rsi
     push rdi
+    push rsi
     push r8
     push r9
     push r10
@@ -105,14 +143,15 @@ exception_common:
     push r14
     push r15
     
-    ; Call C handler: uint64_t exception_handler_c(registers_t *regs)
+    ; Pass current RSP as 1st argument (registers_t*)
     mov rdi, rsp
+    
     call exception_handler_c
     
     ; Switch stack if needed (for process termination)
     mov rsp, rax
     
-    ; Restore (in case we want to return, but usually we halt if kernel)
+    ; Restore registers
     pop r15
     pop r14
     pop r13
@@ -121,12 +160,13 @@ exception_common:
     pop r10
     pop r9
     pop r8
-    pop rdi
     pop rsi
+    pop rdi
     pop rbp
-    pop rbx
     pop rdx
     pop rcx
+    pop rbx
     pop rax
     add rsp, 16 ; drop vector and error code
     iretq
+

src/kernel/main.c

@@ -58,7 +58,6 @@ static void hcf(void) {
     }
 }
 
-// Simple serial port initialization and output for debugging
 static void init_serial() {
     outb(0x3F8 + 1, 0x00);
     outb(0x3F8 + 3, 0x80);
@@ -84,7 +83,6 @@ void kmain(void) {
     platform_init();
     serial_write("[DEBUG] platform_init OK\n");
 
-    // 1. Memory Detection and Heap Init
     uint64_t heap_phys_addr = 0;
     size_t heap_size = 0;
     if (memmap_request.response != NULL) {
@@ -99,7 +97,7 @@ void kmain(void) {
         }
     }
 
-    if (heap_size > 512 * 1024 * 1024) heap_size = 512 * 1024 * 1024; // Cap at 512MB
+    if (heap_size > 512 * 1024 * 1024) heap_size = 512 * 1024 * 1024;
     
     if (heap_phys_addr != 0) {
         memory_manager_init_at((void*)p2v(heap_phys_addr), heap_size);
@@ -109,7 +107,6 @@ void kmain(void) {
         hcf();
     }
 
-    // 2. Graphics Init
     if (framebuffer_request.response == NULL || framebuffer_request.response->framebuffer_count < 1) {
         serial_write("[DEBUG] No framebuffer! Halting.\n");
         hcf();
@@ -119,19 +116,15 @@ void kmain(void) {
     graphics_init(fb);
     serial_write("[DEBUG] graphics_init OK\n");
 
-    // 3. GDT & TSS Init
     gdt_init();
     serial_write("[DEBUG] gdt_init OK\n");
 
-    // 4. Paging Init
     paging_init();
     serial_write("[DEBUG] paging_init OK\n");
 
-    // 5. Syscall Init
     syscall_init();
     serial_write("[DEBUG] syscall_init OK\n");
 
-    // 6. Interrupts Init
     idt_init();
     idt_register_interrupts();
     idt_load();
@@ -141,13 +134,11 @@ void kmain(void) {
 
     serial_write("[DEBUG] Skipping user mode test, proceeding with normal boot.\n");
     
-    // Initialize FAT32 RAMFS and mount Limine modules
     fat32_init();
     if (module_request.response != NULL) {
         for (uint64_t i = 0; i < module_request.response->module_count; i++) {
             struct limine_file *mod = module_request.response->modules[i];
             
-            // mod->path typically starts with a '/' from Limine
             FAT32_FileHandle *fh = fat32_open(mod->path, "w");
             if (fh && fh->valid) {
                 fat32_write(fh, mod->address, mod->size);
@@ -159,25 +150,20 @@ void kmain(void) {
         }
     }
     
-    int ENABLE_USER_TEST = 1; // Set to 1 to test User Mode ring 3 jump
+    int ENABLE_USER_TEST = 1; 
     #ifdef ENABLE_USER_TEST
         process_init();
-        // The desktop is PID 0
     #endif
 
-    // 3. PS/2 Init (Mouse/Keyboard)
     asm("cli");
     ps2_init();
     asm("sti");
 
-    // 4. Window Manager Init (Draws initial desktop)
     wm_init();
 
-    // Re-enable interrupts since we removed sti from idt_load
     asm volatile("sti");
 
-    // 5. Main loop - just wait for interrupts
+
-    // Timer interrupt will drive the redraw system
     while (1) {
         wm_process_input();
         wm_process_deferred_thumbs();

src/kernel/memory_manager.c

@@ -159,11 +159,9 @@ void memory_manager_init_at(void *pool_address, size_t pool_size) {
 }
 
 void memory_manager_init_with_size(size_t pool_size) {
-    // This is now just a wrapper if init_at wasn't called.
+
-    // However, in BoredOS we now prefer explicit init_at.
     if (initialized) return;
-    // Fallback: we still need a buffer if no address is provided?
+
-    // Let's assume for now that BoredOS always calls init_at.
 }
 
 void memory_manager_init(void) {
@@ -183,7 +181,6 @@ void* kmalloc_aligned(size_t size, size_t alignment) {
         return NULL;
     }
     
-    // Check if we can allocate
     if (total_allocated + size > memory_pool_size) {
         asm volatile("push %0; popfq" : : "r"(rflags));
         return NULL;

src/kernel/paging.c

@@ -19,7 +19,6 @@ static void write_cr3(uint64_t cr3) {
 
 // Helper to allocate a page table and clear it
 static uint64_t alloc_page_table_phys(void) {
-    // We allocate a page table in Virtual Memory (HHDM)
     void* ptr = kmalloc(PAGE_SIZE * 2); 
     if (!ptr) return 0;
     
@@ -41,8 +40,7 @@ static uint64_t alloc_page_table_phys(void) {
 }
 
 void paging_init(void) {
-    // Limine sets up a highly mapped page table for us.
+
-    // CR3 contains the physical address of the PML4.
     current_pml4_phys = read_cr3() & PT_ADDR_MASK;
 }
 

src/kernel/panic.c

@@ -0,0 +1,116 @@
+#include "process.h"
+#include "graphics.h"
+#include "io.h"
+
+extern void serial_write(const char *str);
+
+static void draw_string_centered(int y, const char *s, uint32_t color) {
+    if (!s) return;
+    int len = 0;
+    while (s[len]) len++;
+    int x = (get_screen_width() - (len * 8)) / 2;
+    draw_string(x, y, s, color);
+}
+
+void kernel_panic(registers_t *regs, const char *error_name) {
+    // Disable interrupts to prevent nested panics
+    asm volatile("cli");
+
+    // Clear back buffer to black
+    graphics_clear_back_buffer(0x00000000);
+
+    int sh = get_screen_height();
+    int cy = sh / 2;
+
+    // Draw header
+    draw_string_centered(cy - 150, "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", 0xFFFF0000);
+    draw_string_centered(cy - 130, "KERNEL EXCEPTION OCCURRED", 0xFFFFFFFF);
+    draw_string_centered(cy - 110, "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", 0xFFFF0000);
+
+    // Error name
+    char err_buf[256];
+    int pos = 0;
+    const char *prefix = "Exception: ";
+    while(prefix[pos]) { err_buf[pos] = prefix[pos]; pos++; }
+    int i = 0;
+    while(error_name[i]) { err_buf[pos++] = error_name[i++]; }
+    err_buf[pos] = 0;
+    draw_string_centered(cy - 70, err_buf, 0xFFFFCC00);
+
+    // Details - simplified centering by drawing them as a block or individually centered
+    char info_buf[64];
+    
+    // Vector
+    pos = 0;
+    prefix = "Vector: ";
+    while(prefix[pos]) { info_buf[pos] = prefix[pos]; pos++; }
+    uint64_t v = regs->int_no;
+    const char* digits = "0123456789ABCDEF";
+    info_buf[pos++] = '0'; info_buf[pos++] = 'x';
+    for (int i = 15; i >= 0; i--) {
+        info_buf[pos + i] = digits[v & 0xF];
+        v >>= 4;
+    }
+    info_buf[pos + 16] = 0;
+    draw_string_centered(cy - 40, info_buf, 0xFFFFFFFF);
+
+    // Error Code
+    pos = 0;
+    prefix = "Error Code: ";
+    while(prefix[pos]) { info_buf[pos] = prefix[pos]; pos++; }
+    v = regs->err_code;
+    info_buf[pos++] = '0'; info_buf[pos++] = 'x';
+    for (int i = 15; i >= 0; i--) {
+        info_buf[pos + i] = digits[v & 0xF];
+        v >>= 4;
+    }
+    info_buf[pos + 16] = 0;
+    draw_string_centered(cy - 20, info_buf, 0xFFFFFFFF);
+
+    // RIP
+    pos = 0;
+    prefix = "RIP: ";
+    while(prefix[pos]) { info_buf[pos] = prefix[pos]; pos++; }
+    v = regs->rip;
+    info_buf[pos++] = '0'; info_buf[pos++] = 'x';
+    for (int i = 15; i >= 0; i--) {
+        info_buf[pos + i] = digits[v & 0xF];
+        v >>= 4;
+    }
+    info_buf[pos + 16] = 0;
+    draw_string_centered(cy, info_buf, 0xFFFFFFFF);
+
+    // CR2 for page faults
+    if (regs->int_no == 14) {
+        uint64_t cr2;
+        asm volatile("mov %%cr2, %0" : "=r"(cr2));
+        pos = 0;
+        prefix = "CR2: ";
+        while(prefix[pos]) { info_buf[pos] = prefix[pos]; pos++; }
+        info_buf[pos++] = '0'; info_buf[pos++] = 'x';
+        for (int i = 15; i >= 0; i--) {
+            info_buf[pos + i] = digits[cr2 & 0xF];
+            cr2 >>= 4;
+        }
+        info_buf[pos + 16] = 0;
+        draw_string_centered(cy + 20, info_buf, 0xFFFF5555);
+    }
+
+    // Message
+    draw_string_centered(cy + 100, "The system has been halted to prevent damage.", 0xFFFFFFFF);
+    draw_string_centered(cy + 120, "Please restart your computer.", 0xFFAAAAAA);
+
+
+    // Flip buffer to screen
+    graphics_mark_screen_dirty();
+    graphics_flip_buffer();
+
+    serial_write("\n*** KERNEL PANIC ***\n");
+    serial_write(error_name);
+    serial_write("\n");
+
+    // Halt
+    while(1) {
+        asm volatile("cli; hlt");
+    }
+}

src/kernel/syscall.c

@@ -336,8 +336,6 @@ uint64_t syscall_handler_c(uint64_t syscall_num, uint64_t arg1, uint64_t arg2, u
                 asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
                 
                 if (win->pixels) {
-                    // String clipping is handled by draw_char -> put_pixel, 
-                    // but we ensure coordinate sanity here
                     if (ux >= -100 && ux < win->w && uy >= -100 && uy < (win->h - 20)) {
                         graphics_set_render_target(win->pixels, win->w, win->h - 20);
                         draw_string(ux, uy, kernel_str, color);

src/kernel/userland/txtedit.c

@@ -325,8 +325,6 @@ static void editor_paint(ui_window_t win) {
     ui_draw_rounded_rect_filled(win, padding, status_y + 2, content_width, footer_h - 4, 6, COLOR_DARK_PANEL);
     
     char status_text[128];
-    // Simple manual sprintf-like functionality for BoredOS userspace
-    // We'll just draw parts for now as before but cleaned up
     ui_draw_string(win, padding + 15, status_y + 5, "Line:", COLOR_DKGRAY);
     
     char line_str[32];

src/kernel/vm.c

@@ -464,14 +464,9 @@ int vm_exec(const uint8_t *code, int code_size) {
 
     vm_reset();
     
-    // Reset Graphics Overlay
     vm_rect_count = 0;
     wm_custom_paint_hook = vm_paint_overlay;
     
-    // Copy data segment if any?
-    // For this simple VM, we will copy the ENTIRE bytecode to the start of memory
-    // So code and data share the same space (Von Neumann)
-    // But we need to be careful not to overwrite running code if we write to it
 
     // Safety check
     if (code_size > VM_MEMORY_SIZE) {
@@ -489,13 +484,7 @@ int vm_exec(const uint8_t *code, int code_size) {
     while (pc < code_size) {
         uint8_t op = memory[pc++];
         
-        // DEBUGGING
+
-        /*
-        cmd_write("PC:"); cmd_write_int(pc-1); 
-        cmd_write(" OP:"); cmd_write_int(op);
-        cmd_write(" SP:"); cmd_write_int(sp);
-        cmd_write("\n");
-        */
 
         switch (op) {
             case OP_HALT: