| /* 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) |
