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- /* Copyright (C) 2007, 2011 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, see
- <http://www.gnu.org/licenses/>. */
- #include <sysdep.h>
- #include <tls.h>
- #define _ERRNO_H 1
- #include <bits/errno.h>
- #include <bits/kernel-features.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
- #ifdef SHARED
- movq __vdso_getcpu(%rip), %rax
- callq *%rax
- #else
- # ifdef __NR_getcpu
- movl $__NR_getcpu, %eax
- syscall
- # ifndef __ASSUME_GETCPU_SYSCALL
- cmpq $-ENOSYS, %rax
- jne 1f
- # endif
- # endif
- # ifndef __ASSUME_GETCPU_SYSCALL
- movq $VSYSCALL_ADDR_vgetcpu, %rax
- callq *%rax
- 1:
- # else
- # ifndef __NR_getcpu
- # error "cannot happen"
- # endif
- # endif
- #endif
- cmpq $-4095, %rax
- jae SYSCALL_ERROR_LABEL
- movl (%rsp), %eax
- L(pseudo_end):
- add $0x8, %rsp
- cfi_adjust_cfa_offset(-8)
- ret
- PSEUDO_END(sched_getcpu)
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