patch-2.3.43 linux/arch/ia64/kdb/kdb_traps.c

• Lines: 56
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/arch/ia64/kdb/kdb_traps.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/arch/ia64/kdb/kdb_traps.c linux/arch/ia64/kdb/kdb_traps.c
@@ -0,0 +1,55 @@
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/kdb.h>
+
+static struct kdb_bp_support {
+	unsigned long	addr ;
+	int		slot ;
+} kdb_bp_info[NR_CPUS] ;
+
+
+extern void kdb_bp_install (void);
+
+/*
+ * This gets invoked right before a call to ia64_fault().
+ * Returns zero the normal fault handler should be invoked.
+ */
+long
+ia64_kdb_fault_handler (unsigned long vector, unsigned long isr, unsigned long ifa,
+			unsigned long iim, unsigned long itir, unsigned long arg5,
+			unsigned long arg6, unsigned long arg7, unsigned long stack)
+{
+	struct switch_stack *sw = (struct switch_stack *) &stack;
+	struct pt_regs *regs = (struct pt_regs *) (sw + 1);
+	int bundle_slot;
+
+	/*
+	 * TBD
+	 * If KDB is configured, enter KDB for any fault.
+	 */
+	if ((vector == 29) || (vector == 35) || (vector == 36)) {
+		if (!user_mode(regs)) {
+			bundle_slot = ia64_psr(regs)->ri;
+			if (vector == 29) {
+				if (bundle_slot == 0) {
+			 		kdb_bp_info[0].addr = regs->cr_iip;
+					kdb_bp_info[0].slot = bundle_slot;
+					kdb(KDB_REASON_FLTDBG, 0, regs);
+				} else {
+					if ((bundle_slot < 3) &&
+					    (kdb_bp_info[0].addr == regs->cr_iip))
+					{
+						ia64_psr(regs)->id = 1;
+						ia64_psr(regs)->db = 1;
+						kdb_bp_install() ;
+					} else /* some error ?? */
+						kdb(KDB_REASON_FLTDBG, 0, regs);
+				}
+			} else /* single step or taken branch */
+				kdb(KDB_REASON_DEBUG, 0, regs);
+			return 1;
+		}
+	}
+	return 0;
+}