1  /*
 2   * Copyright (c) 2007, 2008, 2011-2013 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  
29  // This is the only C file compiled into Libsystem when building for i386.
30  // We use EXCLUDED_ and INCLUDED_SOURCE_FILES in the xcconfig to accomplish
31  // this.
32  //
33  // i386 is no longer a supported architecture for macOS. The kernel doesn’t run
34  // i386 macOS executables. However, we cannot completely remove the i386
35  // slice from libSystem.B.dylib. In order to support the watchOS Simulator,
36  // macOS includes several libraries with i386 slices. The watchOS Simulator
37  // uses the i386 ISA with a different  Mach-O platform and its own entire set
38  // of system libraries. Some of those libraries (including those from the clang/
39  // llvm project) verify that the compiler works by compiling and linking a
40  // simple executable. That would fail if Libsystem lacked an i386 slice.
41  // So, we will preserve a vestigial i386 slice, but no executables can actually
42  // use it to run.
43  // rdar://problem/59703537
44  
45  #include <TargetConditionals.h>
46  
47  #if !defined(__i386__) || !defined(TARGET_OS_OSX) || (TARGET_OS_OSX == 0)
48  #error "This file should not be built for this environment"
49  #endif // !defined(__i386__) || !defined(TARGET_OS_OSX) || (TARGET_OS_OSX == 0)
50  
51  #include <sys/reason.h>
52  
53  struct ProgramVars;
54  
55  __attribute__((constructor))
56  static void
57  libSystem_initializer(int argc __attribute__((unused)),
58                const char* argv[]  __attribute__((unused)),
59                const char* envp[]  __attribute__((unused)),
60                const char* apple[]  __attribute__((unused)),
61                const struct ProgramVars* vars  __attribute__((unused)))
62  {
63  	abort_with_reason(OS_REASON_LIBSYSTEM, 386,
64  			"i386 is not supported on macOS",
65  			OS_REASON_FLAG_CONSISTENT_FAILURE);
66  }