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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1999-2007 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
	29	#include "SYS.h"
	30
	31	#if defined(__i386__)
	32
	33	.data
	34	.private_extern __current_pid
	35	L__current_pid_addr:
	36	__current_pid:
	37	.long 0
	38
	39	#if defined(__DYNAMIC__)
	40	#define GET_CURRENT_PID \
	41	call 0f ; \
	42	0: ; \
	43	popl %ecx ; \
	44	leal L__current_pid_addr-0b(%ecx), %ecx
	45
	46	#define __current_pid (%ecx)
	47
	48	#else
	49	#define GET_CURRENT_PID
	50	#endif
	51
	52	/*
	53	* If __current_pid is > 0, return it, else make syscall.
	54	* If __current_pid is 0, cache result of syscall.
	55	*/
	56	TEXT
	57	LEAF(___getpid, 0)
	58	GET_CURRENT_PID
	59	movl __current_pid, %eax
	60	testl %eax, %eax
	61	jle 1f
	62	ret
	63	1:
	64	UNIX_SYSCALL_NONAME(getpid, 0, cerror_nocancel)
	65	movl %eax, %edx
	66	xorl %eax, %eax
	67	GET_CURRENT_PID
	68	lock
	69	cmpxchgl %edx, __current_pid
	70	movl %edx, %eax
	71	ret
	72
	73	#elif defined(__x86_64__)
	74
	75	.data
	76	.private_extern __current_pid
	77	__current_pid:
	78	.long 0
	79
	80	/*
	81	* If __current_pid is > 0, return it, else make syscall.
	82	* If __current_pid is 0, cache result of syscall.
	83	*/
	84	TEXT
	85	LEAF(___getpid, 0)
	86	movl __current_pid(%rip), %eax
	87	testl %eax, %eax
	88	jle 1f
	89	ret
	90	1:
	91	UNIX_SYSCALL_NONAME(getpid, 0, cerror_nocancel)
	92	movl %eax, %edx
	93	xorl %eax, %eax
	94	leaq __current_pid(%rip), %rcx
	95	lock
	96	cmpxchgl %edx, (%rcx)
	97	movl %edx, %eax
	98	ret
	99
	100	#else
	101	#error Unsupported architecture
	102	#endif