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57 lines
1.7 KiB
ArmAsm
57 lines
1.7 KiB
ArmAsm
/* Copyright (C) 2004-2016 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 <tcb-offsets.h>
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ENTRY(__libc_vfork)
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PSEUDO_PROLOGUE
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/* Load the thread pointer value in A1 across the vfork. */
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rduniq
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mov v0, a1
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/* Save the TCB-cached PID away in A2, and then negate the TCB
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field. But if it's zero, set it to 0x80000000 instead. See
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raise.c for the logic that relies on this value. */
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ldl a2, PID_OFFSET(v0)
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ldah t0, -0x8000
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negl a2, t1
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cmovne a2, t1, t0
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stl t0, PID_OFFSET(v0);
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lda v0, SYS_ify(vfork)
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call_pal PAL_callsys
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/* Restore the original value of the TCB cache of the PID, if we're
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the parent. But in the child (syscall return value equals zero),
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leave things as they are. */
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beq v0, 1f
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stl a2, PID_OFFSET(a1)
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1:
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/* Normal error check and return. */
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bne a3, SYSCALL_ERROR_LABEL
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ret
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PSEUDO_END (__libc_vfork)
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#if IS_IN (libc)
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weak_alias (__libc_vfork, vfork)
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strong_alias (__libc_vfork, __vfork)
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libc_hidden_def (__vfork)
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#endif
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