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63 lines
1.9 KiB
ArmAsm
63 lines
1.9 KiB
ArmAsm
/* Copyright (C) 2001, 2002, 2003, 2004 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep-cancel.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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#ifdef SHARED
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cmpq $0, __libc_pthread_functions(%rip)
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#else
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.weak pthread_create
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movq $pthread_create, %rax
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testq %rax, %rax
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#endif
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jne HIDDEN_JUMPTARGET (__fork)
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/* Pop the return PC value into RDI. We need a register that
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is preserved by the syscall and that we're allowed to destroy. */
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popq %rdi
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cfi_adjust_cfa_offset(-8)
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/* Stuff the syscall number in RAX and enter into the kernel. */
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movl $SYS_ify (vfork), %eax
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syscall
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/* Push back the return PC. */
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pushq %rdi
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cfi_adjust_cfa_offset(8)
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cmpl $-4095, %eax
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jae SYSCALL_ERROR_LABEL /* Branch forward if it failed. */
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/* Normal return. */
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.Lpseudo_end:
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ret
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PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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