projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* | |
| 23 | Emulate.s | |
| 24 | ||
| 25 | Emulate instructions and traps. | |
| 26 | ||
| 27 | Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials. | |
| 28 | No animal products are used other than rendered otter bile and deep fried pork lard. | |
| 29 | ||
| 30 | */ | |
| 31 | ||
| 32 | #include <cpus.h> | |
| 33 | #include <ppc/asm.h> | |
| 34 | #include <ppc/proc_reg.h> | |
| 35 | #include <ppc/exception.h> | |
| 36 | #include <mach/machine/vm_param.h> | |
| 37 | #include <assym.s> | |
| 38 | ||
| 39 | ||
| 40 | ; General stuff what happens here: | |
| 41 | ; 1) All general context saved, interrupts off, translation off | |
| 42 | ; 2) Vector and floating point disabled, but there may be live context. | |
| 43 | ; This code is responsible for saving and restoring what is used. This | |
| 44 | ; includes exception states, java mode, etc. | |
| 45 | ; 3) No attempt is made to resolve page faults. PTE misses are handled | |
| 46 | ; automatically, but actual faults (ala copyin/copyout) are not. If | |
| 47 | ; a fault does occur, the exception that caused entry to the emulation | |
| 48 | ; routine is remapped to either an instruction or data miss (depending | |
| 49 | ; upon the stage detected) and redrived through the exception handler. | |
| 50 | ; The only time that an instruction fault can happen is when a different | |
| 51 | ; processor removes a mapping between our original fault and when we | |
| 52 | ; fetch the assisted instruction. For an assisted instruction, data | |
| 53 | ; faults should not occur (except in the MP case). For a purely | |
| 54 | ; emulated instruction, faults can occur. | |
| 55 | ; | |
| 56 | ; | |
| 57 | ||
| 58 | ||
| 59 | .align 5 | |
| 60 | .globl EXT(Emulate) | |
| 61 | ||
| 62 | LEXT(Emulate) | |
| 63 | ||
| 64 | b EXT(EmulExit) ; Just return for now... | |
| 65 |