libc/sysdeps/linux/x86_64/__syscall_error.c

   1 /* Wrapper for setting errno.
   2  *
   3  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include <errno.h>
   9 #include <features.h>
  10
  11 /* This routine is jumped to by all the syscall handlers, to stash
  12  * an error number into errno.  */
  13 long __syscall_error(void) attribute_hidden;
  14 long __syscall_error(void)
  15 {
  16         register int err_no __asm__ ("%rcx");
  17         __asm__ ("mov %rax, %rcx\n\t"
  18                  "neg %rcx");
  19         __set_errno(err_no);
  20         return -1;
  21 }