Return to Emulate.s CVS log

Up to [Apple XNU] / XNU / osfmk / ppc

Annotation of XNU/osfmk/ppc/Emulate.s, revision 1.1

1.1     ! root        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: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.