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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1999-2010 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/* Copyright (c) 1992 NeXT Computer, Inc. All rights reserved.
	29	*
	30	* File: libc/ppc/sys/fork.s
	31	*
	32	* HISTORY
	33	* 18-Nov-92 Ben Fathi (benf@next.com)
	34	* Created from M88K sources
	35	*
	36	* 11-Jan-92 Peter King (king@next.com)
	37	* Created from M68K sources
	38	*/
	39
	40	/*
	41	* All of the asm stubs in this file have been adjusted so the pre/post
	42	* fork handlers and dyld fixup are done in C inside Libc. As such, Libc
	43	* expects the __fork asm to fix up the return code to be -1, 0 or pid
	44	* and errno if needed.
	45	*/
	46
	47	#include "SYS.h"
	48
	49	#if defined(__i386__)
	50
	51	LEAF(___fork, 0)
	52	subl $28, %esp // Align the stack, with 16 bytes of extra padding that we'll need
	53
	54	movl $ SYS_fork,%eax; // code for fork -> eax
	55	UNIX_SYSCALL_TRAP // do the system call
	56	jnc L1 // jump if CF==0
	57
	58	CALL_EXTERN(tramp_cerror)
	59	movl $-1,%eax
	60	addl $28, %esp // restore the stack
	61	ret
	62
	63	L1:
	64	orl %edx,%edx // CF=OF=0, ZF set if zero result
	65	jz L2 // parent, since r1 == 0 in parent, 1 in child
	66
	67	//child here...
	68	xorl %eax,%eax // zero eax
	69	REG_TO_EXTERN(%eax, __current_pid);
	70	L2:
	71	addl $28, %esp // restore the stack
	72	// parent ends up here skipping child portion
	73	ret
	74
	75	#elif defined(__x86_64__)
	76
	77	LEAF(___fork, 0)
	78	subq $24, %rsp // Align the stack, plus room for local storage
	79
	80	movl $ SYSCALL_CONSTRUCT_UNIX(SYS_fork),%eax; // code for fork -> rax
	81	UNIX_SYSCALL_TRAP // do the system call
	82	jnc L1 // jump if CF==0
	83
	84	movq %rax, %rdi
	85	CALL_EXTERN(_cerror)
	86	movq $-1, %rax
	87	addq $24, %rsp // restore the stack
	88	ret
	89
	90	L1:
	91	orl %edx,%edx // CF=OF=0, ZF set if zero result
	92	jz L2 // parent, since r1 == 0 in parent, 1 in child
	93
	94	//child here...
	95	xorq %rax, %rax
	96	PICIFY(__current_pid)
	97	movl %eax,(%r11)
	98	L2:
	99	// parent ends up here skipping child portion
	100	addq $24, %rsp // restore the stack
	101	ret
	102
	103	#else
	104	#error Unsupported architecture
	105	#endif