sh: unwinder: Use a special bug flag for unwinder traps.

This simplifies the unwinder trap handling, dropping the use of the
special trapa vector and simply piggybacking on top of the BUG support. A
new BUGFLAG_UNWINDER is added for flagging the unwinder fault, before
continuing on with regular BUG dispatch.

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

1 files changed, 0 insertions, 21 deletions

diff --git a/arch/sh/kernel/unwinder.c b/arch/sh/kernel/unwinder.c
index e83861d9739..468889d958f 100644
--- a/arch/sh/kernel/unwinder.c
+++ b/arch/sh/kernel/unwinder.c
@@ -161,25 +161,4 @@ void unwind_stack(struct task_struct *task, struct pt_regs *regs,
 
 	curr_unwinder->dump(task, regs, sp, ops, data);
 }
-
-/*
- * Trap handler for UWINDER_BUG() statements. We must switch to the
- * unwinder with the next highest rating.
- */
-BUILD_TRAP_HANDLER(unwinder)
-{
-	insn_size_t insn;
-	TRAP_HANDLER_DECL;
-
-	/* Rewind */
-	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
-	insn = *(insn_size_t *)instruction_pointer(regs);
-
-	/* Switch unwinders when unwind_stack() is called */
-	unwinder_faulted = 1;
-
-#ifdef CONFIG_BUG
-	handle_BUG(regs);
-#endif
-}
 EXPORT_SYMBOL_GPL(unwind_stack);