misc/eventfd.s

   1 .text
   2  .globl eventfd
   3  .type eventfd,@function
   4  .align 1<<4
   5  eventfd:
   6
   7  movl $290, %eax
   8  syscall
   9  cmpq $-4095, %rax
  10  jae 0f
  11  ret
  12 0: movq __libc_errno@GOTTPOFF(%rip), %rcx
  13  neg %eax
  14  movl %eax, %fs:(%rcx)
  15  or $-1, %rax
  16  ret
  17  .size eventfd,.-eventfd