projects / apple / objc4.git / blame
| Commit | Line | Data |
|---|---|---|
| b3962a83 A |
1 | /* |
| 2 | * Copyright (c) 2006-2007 Apple Inc. All Rights Reserved. | |
| 3 | * | |
| 4 | * @APPLE_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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 8972963c A |
24 | #error not currently used |
| 25 | ||
| 7af964d1 A |
26 | #ifdef __x86_64__ |
| 27 | ||
| b3962a83 A |
28 | /* |
| 29 | This file defines the non-GC variants of objc_assign_* on a dedicated | |
| 30 | page in the (__DATA,__data) section. At load time under GC, each | |
| 31 | routine is overwritten with a jump to its GC variant. It is necessary | |
| 32 | for these routines to exist on a dedicated page for vm_protect to | |
| 33 | work properly in the GC case. The page exists in the data segment to | |
| 34 | reduce the kernel's page table overhead. | |
| 35 | ||
| 36 | Note: To avoid wasting more space than necessary at runtime, this file | |
| 37 | must not contain anything other than the objc_assign_* routines. | |
| 38 | */ | |
| 39 | ||
| 40 | .data | |
| 41 | .align 12 // align to page boundary | |
| 42 | ||
| b3962a83 A |
43 | // id objc_assign_ivar(id value, id dest, ptrdiff_t offset); |
| 44 | .globl _objc_assign_ivar | |
| 45 | _objc_assign_ivar: | |
| 46 | pushq %rbp | |
| 47 | movq %rsp,%rbp | |
| 48 | movq %rdi,(%rsi,%rdx) // *(dest + offset) = value); | |
| 49 | movq %rdi,%rax // return value; | |
| 50 | leave | |
| 51 | ret | |
| 52 | ||
| 53 | // id objc_assign_global(id value, id *dest); | |
| 54 | .globl _objc_assign_global | |
| 55 | _objc_assign_global: | |
| 56 | pushq %rbp | |
| 57 | movq %rsp,%rbp | |
| 58 | movq %rdi,(%rsi) // *(dest = value); | |
| 59 | movq %rdi,%rax // return value; | |
| 60 | leave | |
| 61 | ret | |
| 62 | ||
| 8972963c A |
63 | // id objc_assign_threadlocal(id value, id *dest); |
| 64 | .globl _objc_assign_threadlocal | |
| 65 | _objc_assign_threadlocal: | |
| 66 | pushq %rbp | |
| 67 | movq %rsp,%rbp | |
| 68 | movq %rdi,(%rsi) // *(dest = value); | |
| 69 | movq %rdi,%rax // return value; | |
| 70 | leave | |
| 71 | ret | |
| 72 | ||
| b3962a83 A |
73 | // As of OS X 10.5, objc_assign_strongCast_non_gc is identical to |
| 74 | // objc_assign_global_non_gc. | |
| 75 | ||
| 76 | // id objc_assign_strongCast(id value, id *dest); | |
| 77 | .globl _objc_assign_strongCast | |
| 78 | _objc_assign_strongCast: | |
| 79 | pushq %rbp | |
| 80 | movq %rsp,%rbp | |
| 81 | movq %rdi,(%rsi) // *(dest = value); | |
| 82 | movq %rdi,%rax // return value; | |
| 83 | leave | |
| 84 | ret | |
| 85 | ||
| b3962a83 | 86 | // Claim the remainder of the page. |
| 8972963c | 87 | .align 12, 0 |
| 7af964d1 A |
88 | |
| 89 | #endif |