sh: Share bug/debug traps across _32 and _64.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
new file mode 100644
index 000000000000..bf70827b17cc
--- /dev/null
+++ b/arch/sh/kernel/traps.c
@@ -0,0 +1,66 @@
+#include <linux/bug.h>
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/kdebug.h>
+#include <asm/system.h>
+
+#ifdef CONFIG_BUG
+static void handle_BUG(struct pt_regs *regs)
+{
+	enum bug_trap_type tt;
+	tt = report_bug(regs->pc, regs);
+	if (tt == BUG_TRAP_TYPE_WARN) {
+		regs->pc += instruction_size(regs->pc);
+		return;
+	}
+
+	die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
+}
+
+int is_valid_bugaddr(unsigned long addr)
+{
+	return addr >= PAGE_OFFSET;
+}
+#endif
+
+/*
+ * Generic trap handler.
+ */
+BUILD_TRAP_HANDLER(debug)
+{
+	TRAP_HANDLER_DECL;
+
+	/* Rewind */
+	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
+
+	if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
+		       SIGTRAP) == NOTIFY_STOP)
+		return;
+
+	force_sig(SIGTRAP, current);
+}
+
+/*
+ * Special handler for BUG() traps.
+ */
+BUILD_TRAP_HANDLER(bug)
+{
+	TRAP_HANDLER_DECL;
+
+	/* Rewind */
+	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
+
+	if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
+		       SIGTRAP) == NOTIFY_STOP)
+		return;
+
+#ifdef CONFIG_BUG
+	if (__kernel_text_address(instruction_pointer(regs))) {
+		opcode_t insn = *(opcode_t *)instruction_pointer(regs);
+		if (insn == TRAPA_BUG_OPCODE)
+			handle_BUG(regs);
+	}
+#endif
+
+	force_sig(SIGTRAP, current);
+}