arch/x86_64/usermode.c


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__attribute__((noreturn))
static void
s_enter_usermode(void *ip, void *sp)
{
    __asm__ volatile("mov %0, %%rsp; \
                      movq %1, %%rcx; \
                      movq $0x202, %%r11; \
                      cli; \
                      swapgs; \
                      sysretq"::
                      "r"(sp), "r"(ip): "memory");
    for(;;);
}