minix/lib/nbsd_libc/arch/arm/sys/__clone.S
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

93 lines
2.6 KiB
ArmAsm

/* $NetBSD: __clone.S,v 1.6 2006/04/24 19:00:30 snj Exp $ */
/*
* Copyright (c) 2001 Christopher Gilbert
* All rights reserved.
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/asm.h>
#include <sys/errno.h>
#include "SYS.h"
#ifdef WEAK_ALIAS
WEAK_ALIAS(clone, __clone)
#endif
/*
* int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
*/
ENTRY(__clone)
/* test stack and function are not null */
teq r0, #0x00
teqne r1, #0x00
beq .Leinval
/* place the func and its arg onto the child's stack */
stmfd r1!, {r0, r3}
/* syscall expects (flags, stack) */
mov r0, r2
SYSTRAP(__clone)
bcs PIC_SYM(CERROR, PLT)
/*
* r1 and r0 are the same as from fork:
* r1 == 0 in parent process, r1 == 1 in child process.
* r0 == pid of child in parent, r0 == pid of parent in child.
*/
teq r1, #0x00
/* if this is the parent then just return the pid */
RETc(eq)
/*
* This is the child
* load the function and arg off the stack
*/
ldmfd sp!, {r1, r2}
/* setup return address */
add lr, pc, #.Lreturnhere - . - 8
/* place arg in r0 */
mov r0, r2
/* call the function */
#ifdef _ARM_ARCH_4T
bx r1
#else
mov pc, r1
#endif
.Lreturnhere:
/* call _exit with the returned value */
b PIC_SYM(_C_LABEL(_exit), PLT)
/* NOTREACHED */
/* error handler if func or stack is NULL */
.Leinval:
mov R0, #EINVAL
b PIC_SYM(CERROR, PLT)