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/* Copyright (C) 2007-2014 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 <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
PTR_DEMANGLE (%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
/* Local variable is result if the call is successful. */
movl (%rsp), %edx
/* Restore stack pointer before we might jump to
SYSCALL_ERROR_LABEL which returns to the caller. */
add $0x8, %rsp
cfi_adjust_cfa_offset(-8)
cmpq $-4095, %rax
jae SYSCALL_ERROR_LABEL
movl %edx, %eax
ret
PSEUDO_END(sched_getcpu)
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