Re: [v2 5/7] x86: Add emulation code for UMIP instructions

Masami Hiramatsu
2016-12-25T15:49:47Z

On Fri, 23 Dec 2016 17:37:43 -0800
Ricardo Neri <ricardo.neri-calderon@linux.intel.com> wrote:

> +static int __identify_insn(struct insn *insn)
> +{
> + /* by getting modrm we also get the opcode */
> + insn_get_modrm(insn);
> + if (insn->opcode.bytes[0] != 0xf)
> + return -EINVAL;
> +
> + if (insn->opcode.bytes[1] == 0x1) {
> + switch (X86_MODRM_REG(insn->modrm.value)) {
> + case 0:
> + return UMIP_SGDT;
> + case 1:
> + return UMIP_SIDT;
> + case 4:
> + return UMIP_SMSW;
> + default:
> + return -EINVAL;
> + }
> + } else if (insn->opcode.bytes[1] == 0x0) {
> + if (X86_MODRM_REG(insn->modrm.value) == 0)
> + return UMIP_SLDT;
> + else if (X86_MODRM_REG(insn->modrm.value) == 1)
> + return UMIP_STR;
> + else
> + return -EINVAL;
> + }

gcc detected an error here, you may need return "-EINVAL".

Thanks,

--
Masami Hiramatsu <mhiramat@kernel.org>