GS_BASE
if (data->arch_data.gs_base != regs->gp[GS_BASE / sizeof(unsigned long)]) {
data->arch_data.gs_base = regs->gp[GS_BASE / sizeof(unsigned long)];
case GS_BASE:
[GS_BASE >> 3] = HOST_GS_BASE,
case GS_BASE:
current->thread.regs.regs.gp[GS_BASE / sizeof(unsigned long)] =
ret = put_user(current->thread.regs.regs.gp[GS_BASE / sizeof(unsigned long)], arg2);