int do_fpuemu()

in math-emu/fpuemu.c [366:406]

• 33 lines of code
• 9 McCabe index (conditional complexity)

int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu)
{
	unsigned long insn = 0, addr = regs->ipc;
	unsigned long emulpc, contpc;
	unsigned char *pc = (void *)&insn;
	char c;
	int i = 0, ret;

	for (i = 0; i < 4; i++) {
		if (__get_user(c, (unsigned char *)addr++))
			return SIGBUS;
		*pc++ = c;
	}

	insn = be32_to_cpu(insn);

	emulpc = regs->ipc;
	contpc = regs->ipc + 4;

	if (NDS32Insn_OPCODE(insn) != cop0_op)
		return SIGILL;

	switch (NDS32Insn_OPCODE_COP0(insn)) {
	case fs1_op:
	case fs2_op:
	case fd1_op:
	case fd2_op:
		{
			/* a real fpu computation instruction */
			ret = fpu_emu(fpu, insn);
			if (!ret)
				regs->ipc = contpc;
		}
		break;

	default:
		return SIGILL;
	}

	return ret;
}