[apple/xnu.git] / libsyscall / custom / __getpid.s

/*
 * Copyright (c) 1999-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include "SYS.h"

#if defined(__ppc__) || defined(__ppc64__)

        .data
        .globl  __current_pid
        .align  2
__current_pid:
        .long 0

MI_ENTRY_POINT(___getpid)
#if defined(__DYNAMIC__)
        mflr    r0              // note we cannot use MI_GET_ADDRESS...
        bcl    20,31,1f         // ...because we define __current_pid
1:
        mflr    r5
        mtlr    r0
        addis   r5, r5, ha16(__current_pid - 1b)
        addi    r5, r5, lo16(__current_pid - 1b)
#else
	lis	r5,hi16(__current_pid)
	ori	r5,r5,lo16(__current_pid)
#endif
        lwz     r3,0(r5)		// get the cached pid
        cmpwi 	r3,0			// if positive,
        bgtlr++                 // return it
	
        SYSCALL_NONAME(getpid, 0)

        lwarx	r4,0,r5			// see if we can cache it
        cmpwi	r4,0			// we can't if there are any...
        blt--	1f              // ...vforks in progress

        stwcx.	r3,0,r5			// ignore cache conflicts
        blr
1:
        li      r6,-4           // on 970, cancel the reservation using red zone...
        stwcx.  r3,r6,r1        // ...to avoid an errata
        blr

#elif defined(__i386__)

	.data
	.private_extern __current_pid
__current_pid:
	.long 0
L__current_pid_addr = __current_pid

#if defined(__DYNAMIC__)
#define GET_CURRENT_PID				\
	call	0f				; \
0:						; \
	popl	%ecx				; \
	leal	L__current_pid_addr-0b(%ecx), %ecx

#define __current_pid (%ecx)

#else
#define GET_CURRENT_PID
#endif

/*
 * If __current_pid is > 0, return it, else make syscall.
 * If __current_pid is 0, cache result of syscall.
 */
TEXT
LEAF(___getpid, 0)
	GET_CURRENT_PID
	movl		__current_pid, %eax
	testl		%eax, %eax
	jle		1f
	ret
1:
	UNIX_SYSCALL_NONAME(getpid, 0)
	movl		%eax, %edx
	xorl		%eax, %eax
	GET_CURRENT_PID
	lock
	cmpxchgl	%edx, __current_pid
	movl		%edx, %eax
	ret

#elif defined(__x86_64__)

	.data
	.private_extern __current_pid
__current_pid:
	.long 0

/*
 * If __current_pid is > 0, return it, else make syscall.
 * If __current_pid is 0, cache result of syscall.
 */
TEXT
LEAF(___getpid, 0)
	movl	__current_pid(%rip), %eax
	testl	%eax, %eax
	jle		1f
	ret
1:
	UNIX_SYSCALL_NONAME(getpid, 0)
	movl		%eax, %edx
	xorl		%eax, %eax
	leaq		__current_pid(%rip), %rcx
	lock
	cmpxchgl	%edx, (%rcx)
	movl		%edx, %eax
	ret

#else
#error Unsupported architecture
#endif
Commit	Line	Data
2d21ac55 A	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(__ppc__) \|\| defined(__ppc64__)
	32
	33	.data
	34	.globl __current_pid
	35	.align 2
	36	__current_pid:
	37	.long 0
	38
	39	MI_ENTRY_POINT(___getpid)
	40	#if defined(__DYNAMIC__)
	41	mflr r0 // note we cannot use MI_GET_ADDRESS...
	42	bcl 20,31,1f // ...because we define __current_pid
	43	1:
	44	mflr r5
	45	mtlr r0
	46	addis r5, r5, ha16(__current_pid - 1b)
	47	addi r5, r5, lo16(__current_pid - 1b)
	48	#else
	49	lis r5,hi16(__current_pid)
	50	ori r5,r5,lo16(__current_pid)
	51	#endif
	52	lwz r3,0(r5) // get the cached pid
	53	cmpwi r3,0 // if positive,
	54	bgtlr++ // return it
	55
	56	SYSCALL_NONAME(getpid, 0)
	57
	58	lwarx r4,0,r5 // see if we can cache it
	59	cmpwi r4,0 // we can't if there are any...
	60	blt-- 1f // ...vforks in progress
	61
	62	stwcx. r3,0,r5 // ignore cache conflicts
	63	blr
	64	1:
65	li r6,-4 // on 970, cancel the reservation using red zone...
66	stwcx. r3,r6,r1 // ...to avoid an errata
67	blr
68
69	#elif defined(__i386__)
70
71	.data
72	.private_extern __current_pid
73	__current_pid:
74	.long 0
75	L__current_pid_addr = __current_pid
76
77	#if defined(__DYNAMIC__)
78	#define GET_CURRENT_PID \
79	call 0f ; \
80	0: ; \
81	popl %ecx ; \
82	leal L__current_pid_addr-0b(%ecx), %ecx
83
84	#define __current_pid (%ecx)
85
86	#else
87	#define GET_CURRENT_PID
88	#endif
89
90	/*
91	* If __current_pid is > 0, return it, else make syscall.
92	* If __current_pid is 0, cache result of syscall.
93	*/
94	TEXT
95	LEAF(___getpid, 0)
96	GET_CURRENT_PID
97	movl __current_pid, %eax
98	testl %eax, %eax
99	jle 1f
100	ret
101	1:
102	UNIX_SYSCALL_NONAME(getpid, 0)
103	movl %eax, %edx
104	xorl %eax, %eax
105	GET_CURRENT_PID
106	lock
107	cmpxchgl %edx, __current_pid
108	movl %edx, %eax
109	ret
110
111	#elif defined(__x86_64__)
112
113	.data
114	.private_extern __current_pid
115	__current_pid:
116	.long 0
117
118	/*
119	* If __current_pid is > 0, return it, else make syscall.
120	* If __current_pid is 0, cache result of syscall.
121	*/
122	TEXT
123	LEAF(___getpid, 0)
124	movl __current_pid(%rip), %eax
125	testl %eax, %eax
126	jle 1f
127	ret
128	1:
129	UNIX_SYSCALL_NONAME(getpid, 0)
130	movl %eax, %edx
131	xorl %eax, %eax
132	leaq __current_pid(%rip), %rcx
133	lock
134	cmpxchgl %edx, (%rcx)
135	movl %edx, %eax
136	ret
137
2d21ac55 A	138	#else
	139	#error Unsupported architecture
	140	#endif