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Annotation of XNU/osfmk/ppc/Emulate.s, revision 1.1.1.1

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: 

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