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96 lines
2.3 KiB
ArmAsm
96 lines
2.3 KiB
ArmAsm
/* Copyright (C) 1999, 2002, 2003, 2010, 2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@gnu.org>.
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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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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <kernel-features.h>
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#ifndef SAVE_PID
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#define SAVE_PID
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#endif
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#ifndef RESTORE_PID
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#define RESTORE_PID
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#endif
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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 __NR_vfork
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/* SAVE_PID clobbers call-clobbered registers and
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saves data in D1 and A1. */
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SAVE_PID
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/* Pop the return PC value into A0. */
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movel %sp@+, %a0
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cfi_adjust_cfa_offset (-4)
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cfi_register (%pc, %a0)
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/* Stuff the syscall number in D0 and trap into the kernel. */
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movel #SYS_ify (vfork), %d0
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trap #0
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RESTORE_PID
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tstl %d0
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jmi .Lerror /* Branch forward if it failed. */
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/* Jump to the return PC. */
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jmp %a0@
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.Lerror:
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/* Push back the return PC. */
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movel %a0,%sp@-
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (%pc, 0)
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# ifdef __ASSUME_VFORK_SYSCALL
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# ifndef PIC
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jbra SYSCALL_ERROR_LABEL
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# endif
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# else
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/* Check if vfork syscall is known at all. */
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movel #-ENOSYS,%d1
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cmpl %d0,%d1
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jne SYSCALL_ERROR_LABEL
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# endif
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#endif
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#ifndef __ASSUME_VFORK_SYSCALL
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/* If we don't have vfork, fork is close enough. */
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movel #SYS_ify (fork), %d0
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trap #0
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tstl %d0
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jmi SYSCALL_ERROR_LABEL
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rts
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#endif
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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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