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Annotation of kernel/machdep/i386/pc_support/PCexception.c, revision 1.1.1.1

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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