projects / apple / xnu.git / blame
| 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 | ||
| 6d2010ae | 31 | #if defined(__i386__) |
| 2d21ac55 A |
32 | |
| 33 | .data | |
| 34 | .private_extern __current_pid | |
| 316670eb A |
35 | L__current_pid_addr: |
| 36 | __current_pid: | |
| 2d21ac55 | 37 | .long 0 |
| 2d21ac55 A |
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: | |
| 316670eb | 64 | UNIX_SYSCALL_NONAME(getpid, 0, cerror_nocancel) |
| 2d21ac55 A |
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: | |
| 316670eb | 91 | UNIX_SYSCALL_NONAME(getpid, 0, cerror_nocancel) |
| 2d21ac55 A |
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 | ||
| 2d21ac55 A |
100 | #else |
| 101 | #error Unsupported architecture | |
| 102 | #endif |