runtime, interrupt: print to screen on errors, print CR2 on panic

CR2 is the last accessed address set on page exceptions

interrupt/handler.c

@@ -59,12 +59,16 @@ const char *interrupt_Descriptions[] = {
  */
 
 SYSV_ABI void interrupt_Handler(int vec, int errcode, uint64_t rip, uint64_t rax, uint64_t rbx, uint64_t rcx, uint64_t rdx, uint64_t rsi, uint64_t rdi, uint64_t rbp, uint64_t rsp, uint64_t r8, uint64_t r9, uint64_t r10, uint64_t r11, uint64_t r12, uint64_t r13, uint64_t r14, uint64_t r15) {
-	io_Printf("Panic: INT %02xh: %s, err=%d(0x%02x), rip=%llx\n"
+	asm volatile("cli");
+	uint64_t cr2;
+	asm volatile("mov %%cr2, %0"
+				 : "=r"(cr2));
+	io_Errorf("Panic: INT %02xh: %s, err=%d(0x%02x), RIP=%llx, CR2=%llx\n"
 			  "    RAX=%016llX, RBX=%016llX, RCX=%016llX, RDX=%016llX\n"
 			  "    RSI=%016llX, RDI=%016llX, RBP=%016llX, RSP=%016llX\n"
 			  "     R8=%016llX,  R9=%016llX, R10=%016llX, R11=%016llX\n"
 			  "    R12=%016llX, R13=%016llX, R14=%016llX, R15=%016llX",
-			  vec, interrupt_Descriptions[vec], errcode, errcode, rip, rax, rbx, rcx, rdx, rsi, rdi, rbp, rsp, r8, r9, r10, r11, r12, r13, r14, r15);
+			  vec, interrupt_Descriptions[vec], errcode, errcode, rip, cr2, rax, rbx, rcx, rdx, rsi, rdi, rbp, rsp, r8, r9, r10, r11, r12, r13, r14, r15);
 	__Panic_HaltSystem();
 }
 

runtime/panic_assert.h

@@ -27,17 +27,19 @@ noreturn void __Panic_HaltSystem();
 
 // Panic() aborts the system after printing the message and some other information.
 noreturn inline static void Panic(const char *message) {
-	io_Printf("Panic: %s\n", message);
+	asm volatile("cli");
+	io_Errorf("Panic: %s\n", message);
 	__Panic_HaltSystem();
 }
 
 // Panicf() aborts the system after printing the message using vsnprintf.
 noreturn inline static void Panicf(const char *fmt, ...) {
+	asm volatile("cli");
 	va_list args;
 	va_start(args, fmt);
 	int ret = vsnprintf(Buffer, HELOS_BUFFER_SIZE, fmt, args);
 	va_end(args);
-	io_Printf("Panic: %s\n", Buffer);
+	io_Errorf("Panic: %s\n", Buffer);
 	__Panic_HaltSystem();
 }
 

runtime/stdio.c

@@ -46,10 +46,7 @@ void __io_WriteConsole_ResizeBuffer(int size) {
 	}
 }
 
-void io_WriteConsole(const char *str) {
-	pic_serial_Write(&pic_serial_COM1, str, 0);
-
-#ifndef HELOS_RUNTIME_QUIET
+static inline void __io_WriteConsoleUTF8(const char *str) {
 	int size = 0;           // don't include the \0 at the end here
 	int len  = strlen(str); // left the \0 out here too
 
@@ -71,13 +68,9 @@ void io_WriteConsole(const char *str) {
 	} else {
 		console_WriteUTF16(&HelosGraphics_Color_White, __io_WriteConsole_buffer, 0);
 	}
-#endif
 }
 
-void io_WriteConsoleASCII(const char *str) {
-	pic_serial_Write(&pic_serial_COM1, str, 0);
-
-#ifndef HELOS_RUNTIME_QUIET
+static inline void __io_WriteConsoleASCII(const char *str) {
 	if (!graphics_Framebuffer) {
 		int len = strlen(str);
 		__io_WriteConsole_ResizeBuffer(len + 1);
@@ -87,6 +80,19 @@ void io_WriteConsoleASCII(const char *str) {
 	} else {
 		console_WriteASCII(&HelosGraphics_Color_White, str, 0);
 	}
+}
+
+void io_WriteConsole(const char *str) {
+	pic_serial_Write(&pic_serial_COM1, str, 0);
+#ifndef HELOS_RUNTIME_QUIET
+	__io_WriteConsoleUTF8(str);
+#endif
+}
+
+void io_WriteConsoleASCII(const char *str) {
+	pic_serial_Write(&pic_serial_COM1, str, 0);
+#ifndef HELOS_RUNTIME_QUIET
+	__io_WriteConsoleASCII(str);
 #endif
 }
 
@@ -104,3 +110,26 @@ int io_Printf(const char *fmt, ...) {
 	INTERRUPT_RESTORE;
 	return ret;
 }
+
+void io_Error(const char *str) {
+	pic_serial_Write(&pic_serial_COM1, str, 0);
+	__io_WriteConsoleUTF8(str);
+}
+
+void io_ErrorASCII(const char *str) {
+	pic_serial_Write(&pic_serial_COM1, str, 0);
+	__io_WriteConsoleASCII(str);
+}
+
+int io_Errorf(const char *fmt, ...) {
+	INTERRUPT_DISABLE;
+	va_list args;
+	va_start(args, fmt);
+	int ret = vsnprintf(__io_Printf_buffer, sizeof(__io_Printf_buffer), fmt, args);
+	va_end(args);
+
+	io_Error(__io_Printf_buffer);
+
+	INTERRUPT_RESTORE;
+	return ret;
+}

runtime/stdio.h

@@ -20,6 +20,11 @@ void io_WriteConsoleASCII(const char *str);
 // io_Printf is a printf() replacement, printing to WriteConsole function.
 int io_Printf(const char *format, ...);
 
+// io_Error prints error information directly to the screen.
+void io_Error(const char *str);
+void io_ErrorASCII(const char *str);
+int  io_Errorf(const char *format, ...);
+
 
 // Debugging printing marcos
 #ifndef NDEBUG