stos/amd64: cpu: Add exception handling groundwork

Signed-off-by: Chloe M. <chloe@mensia.org>
2026-06-23 19:11:14 +00:00
parent 27af606ba2
commit b6d4a1c963
8 changed files with 401 additions and 2 deletions
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: Trap handling
+ * Author:      Chloe M.
+ */
+
+#include <machine/trap.h>
+#include <ke/knot.h>
+#include <stdef.h>
+
+/* Used to convert trap codes to strings */
+static const char *TrapTab[] = {
+    [TRAP_DIVERR] = "divide error",
+    [TRAP_DBG]    = "debug exception",
+    [TRAP_NMI]    = "non-maskable interrupt",
+    [TRAP_BP]     = "breakpoint",
+    [TRAP_OF]     = "overflow",
+    [TRAP_BR]     = "bound range exceeded",
+    [TRAP_UD]     = "undefined opcode",
+    [TRAP_NM]     = "no math coprocessor",
+    [TRAP_DF]     = "double fault",
+    [TRAP_CPR]    = "reserved exception",
+    [TRAP_TS]     = "invalid TSS",
+    [TRAP_NP]     = "segment not present",
+    [TRAP_SS]     = "stack segment fault",
+    [TRAP_GP]     = "general protection fault",
+    [TRAP_PF]     = "page fault"
+};
+
+
+VOID
+MdTrapDispatch(TRAP_FRAME *Frame)
+{
+    if (Frame == NULL) {
+        return;
+    }
+
+    if (Frame->Vector >= NELEM(TrapTab)) {
+        KeKnot(
+            KNOT_EXCEPTION,
+            "Fatal unknown vector %x\n",
+            Frame->Vector
+        );
+    }
+
+    KeKnot(KNOT_EXCEPTION, "Fatal %s\n", TrapTab[Frame->Vector]);
+}