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78 lines
2.2 KiB
ArmAsm
78 lines
2.2 KiB
ArmAsm
/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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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 __ASSEMBLY__ /* for kernel headers */
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#include <linux/sched.h>
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#include <asm/signal.h>
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#include <tcb-offsets.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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.text
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ENTRY (__vfork)
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{
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addli r11, tp, PID_OFFSET /* Point at PID. */
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movei r13, 1
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}
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{
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LD4U r12, r11 /* Load the saved PID. */
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shli r13, r13, 31 /* Build 0x80000000. */
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}
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sub r12, zero, r12 /* Negate it. */
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CMOVEQZ r12, r12, r13 /* Replace zero pids. */
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ST4 r11, r12 /* Store the temporary PID. */
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{
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moveli r0, CLONE_VFORK | CLONE_VM | SIGCHLD
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move r1, zero
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}
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{
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move r2, zero
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move r3, zero
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}
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moveli TREG_SYSCALL_NR_NAME, __NR_clone
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swint1
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BEQZ r0, 1f /* If we are the parent... */
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{
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addli r11, tp, PID_OFFSET /* Point at PID. */
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movei r13, 1
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}
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{
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LD4U r12, r11 /* Load the saved PID. */
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shli r13, r13, 31 /* Build 0x80000000. */
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}
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{
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CMPEQ r13, r12, r12 /* Test for that value. */
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sub r12, zero, r12 /* Re-negate it. */
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}
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CMOVNEZ r12, r13, zero /* Replace zero pids. */
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ST4 r11, r12 /* Restore the PID. */
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1:
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BNEZ r1, 0f
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jrp lr
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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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strong_alias (__vfork, __libc_vfork)
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