0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
99 lines
3.0 KiB
ArmAsm
99 lines
3.0 KiB
ArmAsm
/* $NetBSD: __clone.S,v 1.3 2015/03/27 23:23:14 matt Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/errno.h>
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#include "SYS.h"
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#if defined(SYSLIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: __clone.S,v 1.3 2015/03/27 23:23:14 matt Exp $");
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#endif /* SYSLIBC_SCCS and not lint */
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(clone, __clone)
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#endif
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/*
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* int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
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*/
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ENTRY(__clone)
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/*
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* Sanity checks: func and stack may not be NULL.
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*/
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mv t0, a0 /* we need a0 for return value */
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li a0, EINVAL
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beqz t0, 8f
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beqz a1, 8f
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/*
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* We need to be able to get at the func and arg arguments
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* in the child. Luckily, we have a convenient place to
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* do this: the child's stack.
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*/
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addi a1, a1, -CALLFRAME_SIZ
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REG_S t0, 0(a1)
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REG_S a3, SZREG(a1)
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/*
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* The system call expects (flags, stack).
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*/
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mv a0, a2
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SYSTRAP(__clone)
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# a1 (rv[1]) == 0, parent, child pid in a0
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8: JUMP_TO_CERROR() /* error */
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bnez a1, 9f /* success */
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ret # parent return
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/* NOTREACHED */
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9: /*
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* Child: Fetch the function and argument from the new stack and create
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a frame so that the child can be safely called.
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*
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* There are already register slots on the stack from above.
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* They already include the o32 argument save area. The
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* highest is unused. a1 should equal sp now.
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*/
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REG_L t0, 0(sp)
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REG_L a0, SZREG(sp)
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REG_S zero, CALLFRAME_RA(sp) /* make sure stack frame ends */
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/* Call the clone's entry point. */
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jalr t0
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/* Pass the return value to _exit. */
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tail _C_LABEL(_exit)
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/* NOTREACHED */
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END(__clone)
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