diff options
Diffstat (limited to 'libc/sysdeps/linux/x86_64')
| -rw-r--r-- | libc/sysdeps/linux/x86_64/Makefile.arch | 7 | ||||
| -rw-r--r-- | libc/sysdeps/linux/x86_64/sched_getcpu.S | 72 |
2 files changed, 79 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/x86_64/Makefile.arch b/libc/sysdeps/linux/x86_64/Makefile.arch index de7ce7285..0d14650ff 100644 --- a/libc/sysdeps/linux/x86_64/Makefile.arch +++ b/libc/sysdeps/linux/x86_64/Makefile.arch @@ -17,3 +17,10 @@ SSRC := \ ifneq ($(UCLIBC_HAS_THREADS_NATIVE),y) SSRC += vfork.S clone.S endif + +ifeq ($(UCLIBC_LINUX_SPECIFIC),y) +ARCH_OBJ_FILTEROUT = sched_getcpu.c +ifeq ($(UCLIBC_HAS_TLS),y) +SSRC += sched_getcpu.S +endif +endif diff --git a/libc/sysdeps/linux/x86_64/sched_getcpu.S b/libc/sysdeps/linux/x86_64/sched_getcpu.S new file mode 100644 index 000000000..592bcdbdf --- /dev/null +++ b/libc/sysdeps/linux/x86_64/sched_getcpu.S @@ -0,0 +1,72 @@ +/* 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, 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> +#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 + 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 + + 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) |