enum emulation_result kvm_mips_complete_mmio_load()

in kvm/emulate.c [1511:1652]

• 134 lines of code
• 34 McCabe index (conditional complexity)

enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu)
{
	struct kvm_run *run = vcpu->run;
	unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr];
	enum emulation_result er = EMULATE_DONE;

	if (run->mmio.len > sizeof(*gpr)) {
		kvm_err("Bad MMIO length: %d", run->mmio.len);
		er = EMULATE_FAIL;
		goto done;
	}

	/* Restore saved resume PC */
	vcpu->arch.pc = vcpu->arch.io_pc;

	switch (run->mmio.len) {
	case 8:
		switch (vcpu->mmio_needed) {
		case 11:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffffffffff) |
				(((*(s64 *)run->mmio.data) & 0xff) << 56);
			break;
		case 12:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffffffff) |
				(((*(s64 *)run->mmio.data) & 0xffff) << 48);
			break;
		case 13:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffffff) |
				(((*(s64 *)run->mmio.data) & 0xffffff) << 40);
			break;
		case 14:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffff) |
				(((*(s64 *)run->mmio.data) & 0xffffffff) << 32);
			break;
		case 15:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffff) |
				(((*(s64 *)run->mmio.data) & 0xffffffffff) << 24);
			break;
		case 16:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffff) |
				(((*(s64 *)run->mmio.data) & 0xffffffffffff) << 16);
			break;
		case 17:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xff) |
				(((*(s64 *)run->mmio.data) & 0xffffffffffffff) << 8);
			break;
		case 18:
		case 19:
			*gpr = *(s64 *)run->mmio.data;
			break;
		case 20:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xff00000000000000) |
				((((*(s64 *)run->mmio.data)) >> 8) & 0xffffffffffffff);
			break;
		case 21:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffff000000000000) |
				((((*(s64 *)run->mmio.data)) >> 16) & 0xffffffffffff);
			break;
		case 22:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffff0000000000) |
				((((*(s64 *)run->mmio.data)) >> 24) & 0xffffffffff);
			break;
		case 23:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffff00000000) |
				((((*(s64 *)run->mmio.data)) >> 32) & 0xffffffff);
			break;
		case 24:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffffff000000) |
				((((*(s64 *)run->mmio.data)) >> 40) & 0xffffff);
			break;
		case 25:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffffffff0000) |
				((((*(s64 *)run->mmio.data)) >> 48) & 0xffff);
			break;
		case 26:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffffffffffff00) |
				((((*(s64 *)run->mmio.data)) >> 56) & 0xff);
			break;
		default:
			*gpr = *(s64 *)run->mmio.data;
		}
		break;

	case 4:
		switch (vcpu->mmio_needed) {
		case 1:
			*gpr = *(u32 *)run->mmio.data;
			break;
		case 2:
			*gpr = *(s32 *)run->mmio.data;
			break;
		case 3:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffff) |
				(((*(s32 *)run->mmio.data) & 0xff) << 24);
			break;
		case 4:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffff) |
				(((*(s32 *)run->mmio.data) & 0xffff) << 16);
			break;
		case 5:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xff) |
				(((*(s32 *)run->mmio.data) & 0xffffff) << 8);
			break;
		case 6:
		case 7:
			*gpr = *(s32 *)run->mmio.data;
			break;
		case 8:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xff000000) |
				((((*(s32 *)run->mmio.data)) >> 8) & 0xffffff);
			break;
		case 9:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffff0000) |
				((((*(s32 *)run->mmio.data)) >> 16) & 0xffff);
			break;
		case 10:
			*gpr = (vcpu->arch.gprs[vcpu->arch.io_gpr] & 0xffffff00) |
				((((*(s32 *)run->mmio.data)) >> 24) & 0xff);
			break;
		default:
			*gpr = *(s32 *)run->mmio.data;
		}
		break;

	case 2:
		if (vcpu->mmio_needed == 1)
			*gpr = *(u16 *)run->mmio.data;
		else
			*gpr = *(s16 *)run->mmio.data;

		break;
	case 1:
		if (vcpu->mmio_needed == 1)
			*gpr = *(u8 *)run->mmio.data;
		else
			*gpr = *(s8 *)run->mmio.data;
		break;
	}

done:
	return er;
}