libkern/kxld/kxld_versionmin.c

   1 /*
   2  * Copyright (c) 2011 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 #include <string.h>
  29 #include <mach-o/loader.h>
  30 #include <sys/types.h>
  31
  32 #define DEBUG_ASSERT_COMPONENT_NAME_STRING "kxld"
  33 #include <AssertMacros.h>
  34
  35 #include "kxld_util.h"
  36 #include "kxld_versionmin.h"
  37
  38 /*******************************************************************************
  39 *******************************************************************************/
  40 void
  41 kxld_versionmin_init_from_macho(KXLDversionmin *versionmin, struct version_min_command *src)
  42 {
  43     check(versionmin);
  44     check(src);
  45     check((src->cmd == LC_VERSION_MIN_MACOSX) || (src->cmd == LC_VERSION_MIN_IPHONEOS) || (src->cmd == LC_VERSION_MIN_WATCHOS));
  46
  47     switch (src->cmd) {
  48         case LC_VERSION_MIN_MACOSX:
  49             versionmin->platform = kKxldVersionMinMacOSX;
  50             break;
  51         case LC_VERSION_MIN_IPHONEOS:
  52             versionmin->platform = kKxldVersionMiniPhoneOS;
  53             break;
  54         case LC_VERSION_MIN_WATCHOS:
  55             versionmin->platform = kKxldVersionMinWatchOS;
  56             break;
  57     }
  58
  59     versionmin->version = src->version;
  60     versionmin->has_versionmin = TRUE;
  61 }
  62
  63 /*******************************************************************************
  64 *******************************************************************************/
  65 void
  66 kxld_versionmin_clear(KXLDversionmin *versionmin)
  67 {
  68     bzero(versionmin, sizeof(*versionmin));
  69 }
  70
  71 /*******************************************************************************
  72 *******************************************************************************/
  73 u_long
  74 kxld_versionmin_get_macho_header_size(void)
  75 {
  76     return sizeof(struct version_min_command);
  77 }
  78
  79 /*******************************************************************************
  80 *******************************************************************************/
  81 kern_return_t
  82 kxld_versionmin_export_macho(const KXLDversionmin *versionmin, u_char *buf,
  83     u_long *header_offset, u_long header_size)
  84 {
  85     kern_return_t rval = KERN_FAILURE;
  86     struct version_min_command *versionminhdr = NULL;
  87
  88     check(versionmin);
  89     check(buf);
  90     check(header_offset);
  91
  92     require_action(sizeof(*versionminhdr) <= header_size - *header_offset, finish,
  93         rval=KERN_FAILURE);
  94     versionminhdr = (struct version_min_command *) ((void *) (buf + *header_offset));
  95     bzero(versionminhdr, sizeof(*versionminhdr));
  96     *header_offset += sizeof(*versionminhdr);
  97
  98     switch (versionmin->platform) {
  99         case kKxldVersionMinMacOSX:
 100             versionminhdr->cmd = LC_VERSION_MIN_MACOSX;
 101             break;
 102         case kKxldVersionMiniPhoneOS:
 103             versionminhdr->cmd = LC_VERSION_MIN_IPHONEOS;
 104             break;
 105         case kKxldVersionMinWatchOS:
 106             versionminhdr->cmd = LC_VERSION_MIN_WATCHOS;
 107             break;
 108     }
 109     versionminhdr->cmdsize = (uint32_t) sizeof(*versionminhdr);
 110     versionminhdr->version = versionmin->version;
 111     versionminhdr->sdk = 0;
 112
 113     rval = KERN_SUCCESS;
 114
 115 finish:
 116     return rval;
 117 }
 118