feature: print_stack working (dont use opti flags, else the stack is broken)

src/debug/print_stack.c

@@ -0,0 +1,13 @@
+#include "debug.h"
+#include "kprintf.h"
+
+void print_stack(void)
+{
+	struct stackframe *stack =
+	    (struct stackframe *)__builtin_frame_address(0);
+
+	while (stack) {
+		kprintf(0, "stack->ebp: %d\n", stack->ebp);
+		stack = stack->ebp;
+	}
+}

src/gdt/gdt.c

@@ -34,10 +34,10 @@ static void set_gdt_entry_value(uint8_t *target, uint32_t base, uint32_t limit,
 	target[6] |= (granularity << 4);
 }
 
-void initGdt(void)
+void init_gdt(void)
 {
 	gdtr->size = 8 * GDT_SIZE - 1;
-	gdtr->base = (uint32_t)&gdt_entries;
+	gdtr->base = (uint32_t)&gdt_entries[0];
 
 	set_gdt_entry_value(gdt_entries + 0x00, 0, 0, 0, 0); // Null segment
 
@@ -58,7 +58,7 @@ void initGdt(void)
 		GDT_ACCESS_A_ACCESSED,
 	    GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel data
 	set_gdt_entry_value(
-	    gdt_entries + 0x18, 0, 0x0,
+	    gdt_entries + 0x18, 0, 0xFFFFF,
 	    GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE |
 		GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE |
 		GDT_ACCESS_DC_CONFORM |

src/kernel.c

@@ -24,6 +24,6 @@ void kernel_main(void)
 	/* Initialize terminal interface */
 	terminal_initialize();
 
-	initGdt();
+	init_gdt();
 	shell_init();
 }

src/shell/exec.c

@@ -29,6 +29,8 @@ static CMD_TOK find_command(char *line)
 		command = POWEROFF;
 	else if (!strcmp(line, "halt"))
 		command = HALT;
+	else if (!strcmp(line, "stack"))
+		command = STACK;
 	else if (!strcmp(line, "echo"))
 		command = ECHO;
 	else if (!strcmp(line, "color"))
@@ -95,6 +97,9 @@ void shell_init(void)
 		case HALT:
 			halt();
 			break;
+		case STACK:
+			print_stack();
+			break;
 		case ECHO:
 			kprintf(0, "echoing\n");
 			break;

src/shell/power.c

@@ -27,8 +27,8 @@ void reboot(void)
 	} while (check_flag(tmp, KBD_BIT_UDATA));
 	outb(KBD_INTERFACE, KBD_RESET); /* pulse CPU reset line */
 loop:
-	asm volatile("hlt"); /* if that didn't work, halt the CPU */
-	goto loop;           /* if a NMI is received, halt again */
+	asm volatile("hlt");
+	goto loop;
 }
 
 void halt(void)