libkern/libkern/kxld.h

   1 /*
   2  * Copyright (c) 2007-2008 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #ifndef _KXLD_H
  29 #define _KXLD_H
  30
  31 #include <sys/types.h>
  32 #include <mach/boolean.h>       // boolean_t
  33 #include <mach/kern_return.h>   // kern_return_t
  34 #include <mach/machine.h>       // cpu_type_t and cpu_subtype_t
  35 #include <mach/vm_types.h>
  36
  37 #include "kxld_types.h"
  38
  39 /*******************************************************************************
  40 * API
  41 *******************************************************************************/
  42
  43 /*******************************************************************************
  44 * Creates a state object for the linker.  A context must be created for each
  45 * link thread and destroyed at the end of the thread's life.  A context should
  46 * be reused for all links occuring in that link thread.
  47 *   context             Returns a pointer to the new context object
  48 *   allocate callback   Callback to allocate memory for the linked kext
  49 *   log_callback        Callback for all kxld logging output
  50 *   flags               Flags to control the behavior of kxld
  51 *   cputype             The target arch's CPU type (0 for host arch)
  52 *   cpusubtype          The target arch's CPU subtype (0 for host subtype)
  53 *   pagesize            The target page size (0 for host page size)
  54 *******************************************************************************/
  55 kern_return_t kxld_create_context(
  56     KXLDContext **context,
  57     KXLDAllocateCallback allocate_callback,
  58     KXLDLoggingCallback log_callback,
  59     KXLDFlags flags,
  60     cpu_type_t cputype,
  61     cpu_subtype_t cpusubtype,
  62     vm_size_t pagesize)
  63     __attribute__((nonnull(1,2),visibility("default")));
  64
  65 /*******************************************************************************
  66 * Destroys a link context and frees all associated memory.  Should be called at
  67 * the end of a link thread's life.
  68 *******************************************************************************/
  69 void kxld_destroy_context(
  70     KXLDContext *context)
  71     __attribute__((nonnull,visibility("default")));
  72
  73 /*******************************************************************************
  74 * Links a kext against its dependencies, using a callback to allocate the memory
  75 * at which it will be located.
  76 * NOTE: The object data itself must be mmapped with PROT_WRITE and MAP_PRIVATE
  77 *   context             The KXLDContext object for the current link thread.
  78 *   file                The kext object file read into memory.
  79 *                       Supported formats: Mach-O, Mach-O64, Fat.
  80 *   size                The size of the kext in memory.  Must be nonzero.
  81 *   name                The name, usually the bundle identifier, of the kext
  82 *   callback_data       Data that is to be passed to the callback functions.
  83 *   dependencies        An array of pointers to the kexts upon which this kext
  84 *                       is dependent.
  85 *   num_dependencies    Number of entries in the 'dependencies' array.
  86 *   linked_object       This will be set to the address of the linked kext
  87 *                       object. If the address provided by the
  88 *                       kxld_alloc_callback is considered writable, this
  89 *                       pointer will be set to that address.  Otherwise, the
  90 *                       linked object will be written to a temporary buffer
  91 *                       that should be freed by the caller.
  92 *   kmod_info_kern      Kernel address of the kmod_info_t structure.
  93 ******************************************************************************/
  94 kern_return_t kxld_link_file(
  95     KXLDContext *context,
  96     u_char *file,
  97     u_long size,
  98     const char *name,
  99     void *callback_data,
 100     KXLDDependency *dependencies,
 101     u_int num_dependencies,
 102     u_char **linked_object,
 103     kxld_addr_t *kmod_info_kern)
 104     __attribute__((nonnull(1,2,4,6,8,9), visibility("default")));
 105
 106 /*******************************************************************************
 107 *******************************************************************************/
 108 boolean_t kxld_validate_copyright_string(const char *str)
 109     __attribute__((pure, nonnull, visibility("default")));
 110
 111 #endif // _KXLD_H_
 112