CPUID in GNU Assembly

cpuid.s

.section .data
output:
    .ascii "The processor Vendor ID is: "
vendor_id:
    .ascii "xxxxYYYYzzzz\n"

.section .bss

.section .text

.globl _start
_start:
    nop

    movl $0, %eax
    cpuid

    movl $vendor_id, %eax
    movl %ebx, 0(%eax)
    movl %edx, 4(%eax)
    movl %ecx, 8(%eax)

    movl $4, %eax
    movl $1, %ebx
    movl $output, %ecx
    movl $28, %edx
    int $0x80

    movl $4, %eax
    movl $1, %ebx
    movl $vendor_id, %ecx
    movl $13, %edx
    int $0x80

    movl $1, %eax
    movl $0, %ebx
    int $0x80