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Annotation of XNU/osfmk/ddb/db_ext_symtab.c, 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:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: 
        !            51: /*
        !            52:  */
        !            53: #include <mach_kdb.h>
        !            54: #include <mach_debug.h>
        !            55: 
        !            56: #include <mach/vm_param.h>
        !            57: #include <mach/std_types.h>
        !            58: #include <mach/mach_types.h>
        !            59: #include <mach/mach_host_server.h>  /* prototype */
        !            60: 
        !            61: #if MACH_KDB && MACH_DEBUG
        !            62: #include <vm/vm_map.h>
        !            63: #include <vm/vm_kern.h>
        !            64: #include <kern/host.h>
        !            65: #include <kern/task.h>
        !            66: #include <ddb/db_sym.h>
        !            67: #include <vm/vm_user.h>                /* For vm_deallocate() */
        !            68: #endif
        !            69: 
        !            70: /*
        !            71:  *     Loads a symbol table for an external file into the kernel debugger.
        !            72:  *     The symbol table data is an array of characters.  It is assumed that
        !            73:  *     the caller and the kernel debugger agree on its format.
        !            74:  */
        !            75: kern_return_t
        !            76: host_load_symbol_table(
        !            77:        host_t          host,
        !            78:        task_t          task,
        !            79:        char *          name,
        !            80:        pointer_t       symtab,
        !            81:        mach_msg_type_number_t  symtab_count)
        !            82: {
        !            83: #if !MACH_DEBUG || !MACH_KDB
        !            84:         return KERN_FAILURE;
        !            85: #else
        !            86:        kern_return_t   result;
        !            87:        vm_offset_t     symtab_start;
        !            88:        vm_offset_t     symtab_end;
        !            89:        vm_map_t        map;
        !            90:        vm_map_copy_t   symtab_copy_object;
        !            91: 
        !            92:        if (host == HOST_NULL)
        !            93:            return (KERN_INVALID_ARGUMENT);
        !            94: 
        !            95:        /*
        !            96:         * Copy the symbol table array into the kernel.
        !            97:         * We make a copy of the copy object, and clear
        !            98:         * the old one, so that returning error will not
        !            99:         * deallocate the data twice.
        !           100:         */
        !           101:        symtab_copy_object = (vm_map_copy_t) symtab;
        !           102:        result = vm_map_copyout(
        !           103:                        kernel_map,
        !           104:                        &symtab_start,
        !           105:                        vm_map_copy_copy(symtab_copy_object));
        !           106:        if (result != KERN_SUCCESS)
        !           107:            return (result);
        !           108: 
        !           109:        symtab_end = symtab_start + symtab_count;
        !           110: 
        !           111:        /*
        !           112:         * Add the symbol table.
        !           113:         * Do not keep a reference for the task map.    XXX
        !           114:         */
        !           115:        if (task == TASK_NULL)
        !           116:            map = VM_MAP_NULL;
        !           117:        else
        !           118:            map = task->map;
        !           119:        if (!X_db_sym_init((char *)symtab_start,
        !           120:                        (char *)symtab_end,
        !           121:                        name,
        !           122:                        (char *)map))
        !           123:        {
        !           124:            /*
        !           125:             * Not enough room for symbol table - failure.
        !           126:             */
        !           127:            (void) vm_deallocate(kernel_map,
        !           128:                        symtab_start,
        !           129:                        symtab_count);
        !           130:            return (KERN_FAILURE);
        !           131:        }
        !           132: 
        !           133:        /*
        !           134:         * Wire down the symbol table
        !           135:         */
        !           136:        (void) vm_map_wire(kernel_map,
        !           137:                symtab_start,
        !           138:                round_page(symtab_end),
        !           139:                VM_PROT_READ|VM_PROT_WRITE, FALSE);
        !           140: 
        !           141:        /*
        !           142:         * Discard the original copy object
        !           143:         */
        !           144:        vm_map_copy_discard(symtab_copy_object);
        !           145: 
        !           146:        return (KERN_SUCCESS);
        !           147: #endif /* MACH_DEBUG && MACH_KDB */
        !           148: }

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