Commit 5d0cc7e5 authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Refactor bug_handler() implementation 



1. Early return for user mode triggered exception with all types.
2. Give a chance to call fixup_exception() for default types (like
   S390).

Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 0816b2ea

arch/loongarch/kernel/traps.c

+10 −3
Original line number Diff line number Diff line
@@ -597,17 +597,24 @@ int is_valid_bugaddr(unsigned long addr) 


static void bug_handler(struct pt_regs *regs)

{

	if (user_mode(regs)) {

		force_sig(SIGTRAP);

		return;

	}



	switch (report_bug(regs->csr_era, regs)) {

	case BUG_TRAP_TYPE_BUG:

	case BUG_TRAP_TYPE_NONE:

		die_if_kernel("Oops - BUG", regs);

		force_sig(SIGTRAP);

		die("Oops - BUG", regs);

		break;



	case BUG_TRAP_TYPE_WARN:

		/* Skip the BUG instruction and continue */

		regs->csr_era += LOONGARCH_INSN_SIZE;

		break;



	default:

		if (!fixup_exception(regs))

			die("Oops - BUG", regs);

	}

}