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75 lines
1.9 KiB
ArmAsm
75 lines
1.9 KiB
ArmAsm
/* Copyright (C) 2007-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <tls.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <kernel-features.h>
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/* For the calculation see asm/vsyscall.h. */
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#define VSYSCALL_ADDR_vgetcpu 0xffffffffff600800
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ENTRY (sched_getcpu)
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/* Align stack and create local variable for result. */
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sub $0x8, %rsp
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cfi_adjust_cfa_offset(8)
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movq %rsp, %rdi
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xorl %esi, %esi
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movl $VGETCPU_CACHE_OFFSET, %edx
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addq %fs:0, %rdx
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#ifdef SHARED
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movq __vdso_getcpu(%rip), %rax
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PTR_DEMANGLE (%rax)
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callq *%rax
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#else
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# ifdef __NR_getcpu
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movl $__NR_getcpu, %eax
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syscall
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# ifndef __ASSUME_GETCPU_SYSCALL
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cmpq $-ENOSYS, %rax
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jne 1f
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# endif
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# endif
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# ifndef __ASSUME_GETCPU_SYSCALL
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movq $VSYSCALL_ADDR_vgetcpu, %rax
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callq *%rax
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1:
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# else
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# ifndef __NR_getcpu
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# error "cannot happen"
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# endif
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# endif
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#endif
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/* Local variable is result if the call is successful. */
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movl (%rsp), %edx
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/* Restore stack pointer before we might jump to
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SYSCALL_ERROR_LABEL which returns to the caller. */
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add $0x8, %rsp
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cfi_adjust_cfa_offset(-8)
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cmpq $-4095, %rax
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jae SYSCALL_ERROR_LABEL
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movl %edx, %eax
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ret
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PSEUDO_END(sched_getcpu)
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