diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S b/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S new file mode 100644 index 0000000000..8d74d53a76 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S @@ -0,0 +1,50 @@ +/* Copyright (C) 2007 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <tls.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* For the calculation see asm/vsyscall.h. */ +#define VSYSCALL_ADDR_vgetcpu 0xffffffffff600800 + + +ENTRY (sched_getcpu) + /* Align stack and create local variable for result. */ + sub $0x8, %rsp + cfi_adjust_cfa_offset(8) + + movq %rsp, %rdi + xorl %esi, %esi + movl $VGETCPU_CACHE_OFFSET, %edx + addq %fs:0, %rdx + + movq $VSYSCALL_ADDR_vgetcpu, %rax + callq *%rax + + cmpq $-4095, %rdi + jae SYSCALL_ERROR_LABEL + + movl (%rsp), %eax + +L(pseudo_end): + add $0x8, %rsp + cfi_adjust_cfa_offset(-8) + ret +PSEUDO_END(sched_getcpu) |