asmlinkage void do_illegal_instruction()

in kernel/traps.c [428:458]

• 25 lines of code
• 4 McCabe index (conditional complexity)

asmlinkage void do_illegal_instruction(struct pt_regs *regs,
				       unsigned long address)
{
	unsigned int op;
	unsigned int insn = *((unsigned int *)address);

	op = insn >> 26;

	switch (op) {
	case INSN_LWA:
		simulate_lwa(regs, address, insn);
		return;

	case INSN_SWA:
		simulate_swa(regs, address, insn);
		return;

	default:
		break;
	}

	if (user_mode(regs)) {
		/* Send a SIGILL */
		force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
	} else {		/* Kernel mode */
		printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
		       address);
		show_registers(regs);
		die("Die:", regs, address);
	}
}