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Annotation of kernel/machdep/i386/pc_support/PCexception.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1993 NeXT Computer, Inc.
        !            27:  *
        !            28:  * PC support exception handling.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 22 Mar 1993 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #import <mach/mach_types.h>
        !            37: #import <mach/exception.h>
        !            38: 
        !            39: #import <machdep/i386/trap.h>
        !            40: #import <machdep/i386/cpu_inline.h>
        !            41: #import <machdep/i386/err_inline.h>
        !            42: 
        !            43: #import "PCprivate.h"
        !            44: 
        !            45: static void    PCpagefaultContinue(void);
        !            46: 
        !            47: boolean_t
        !            48: PCexception(
        !            49:     thread_t                   thread,
        !            50:     thread_saved_state_t       *state
        !            51: )
        !            52: {
        !            53:     PCcontext_t                context = threadPCContext(thread);
        !            54:     
        !            55:     if (!context->running)
        !            56:        return (FALSE);
        !            57: 
        !            58:     if (state->trapno == T_PAGE_FAULT) {
        !            59:        kern_return_t   result;
        !            60:        vm_offset_t     va;
        !            61:                
        !            62:        va = cr2();
        !            63:        result = vm_fault(thread->task->map, trunc_page(va),
        !            64:                            state->frame.err.pgfault.wrtflt?
        !            65:                                VM_PROT_READ | VM_PROT_WRITE:
        !            66:                                VM_PROT_READ,
        !            67:                            FALSE, 0);
        !            68:        if (result != KERN_SUCCESS) {
        !            69:            context->trapNum = state->trapno;
        !            70:            context->errCode = err_to_error_code(state->frame.err);
        !            71:            context->exceptionResult = result;
        !            72: 
        !            73:            exception_with_continuation(
        !            74:                        EXC_BAD_ACCESS, result, va, PCpagefaultContinue);
        !            75:            /* NOTREACHED */
        !            76:            
        !            77:            if (context->exceptionResult != KERN_SUCCESS) {
        !            78:                context->callHandler = PC_HANDLE_FAULT;
        !            79:        
        !            80:                PCcallMonitor(thread, state);
        !            81:                /* NOTREACHED */
        !            82:            }
        !            83:        }
        !            84:     }
        !            85:     else if (state->trapno == T_NOEXTENSION && !context->EM_bit)
        !            86:        fp_noextension(state);
        !            87:     else if (state->frame.eflags & EFL_VM) {
        !            88:        if (!PCemulateREAL(thread, state))
        !            89:            return (FALSE);
        !            90:     }
        !            91:     else {
        !            92:        if (!PCemulatePROT(thread, state))
        !            93:            return (FALSE);
        !            94:     }
        !            95: 
        !            96:     if (context->callHandler == PC_HANDLE_NONE &&
        !            97:        (context->pendingCallbacks || PCtimersPending(context))) {
        !            98:        PCcallMonitor(thread, state);
        !            99:        /* NOTREACHED */
        !           100:     }
        !           101:     
        !           102:     thread_exception_return();
        !           103:     /* NOTREACHED */
        !           104: }
        !           105: 
        !           106: static
        !           107: void
        !           108: PCpagefaultContinue(void)
        !           109: {
        !           110:     thread_t                   thread = current_thread();
        !           111:     thread_saved_state_t       *state = USER_REGS(thread);
        !           112:     PCcontext_t                        context = threadPCContext(thread);
        !           113:     
        !           114:     if (context->exceptionResult != KERN_SUCCESS) {
        !           115:        context->callHandler = PC_HANDLE_FAULT;
        !           116:        
        !           117:        PCcallMonitor(thread, state);
        !           118:        /* NOTREACHED */
        !           119:     }
        !           120: 
        !           121:     if (context->callHandler == PC_HANDLE_NONE &&
        !           122:        (context->pendingCallbacks || PCtimersPending(context))) {
        !           123:        PCcallMonitor(thread, state);
        !           124:        /* NOTREACHED */
        !           125:     }
        !           126:     
        !           127:     thread_exception_return();
        !           128:     /* NOTREACHED */
        !           129: }

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