| | 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 | |
projects / apple / xnu.git / blame_incremental