libsyscall/custom/custom.s

   1 /*
   2  * Copyright (c) 1999-2007 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 /* Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
  29  */
  30
  31 #include "SYS.h"
  32
  33 #if defined(__i386__)
  34
  35         .globl  _errno
  36
  37 LABEL(cerror)
  38         REG_TO_EXTERN(%eax, _errno)
  39         mov             %esp,%edx
  40         andl    $0xfffffff0,%esp
  41         subl    $16,%esp
  42         movl    %edx,4(%esp)
  43         movl    %eax,(%esp)
  44         CALL_EXTERN(_cthread_set_errno_self)
  45         movl    4(%esp),%esp
  46         movl    $-1,%eax
  47         movl    $-1,%edx /* in case a 64-bit value is returned */
  48         ret
  49
  50 LABEL(__sysenter_trap)
  51         popl %edx
  52         movl %esp, %ecx
  53         sysenter
  54
  55 #elif defined(__x86_64__)
  56
  57         .globl  _errno
  58
  59 LABEL(cerror)
  60         PICIFY(_errno) /* address -> %r11 */
  61         movl    %eax,(%r11)
  62         mov     %rsp,%rdx
  63         andq    $-16,%rsp
  64         subq    $16,%rsp
  65         // Preserve the original stack
  66         movq    %rdx,(%rsp)
  67         movq    %rax,%rdi
  68         CALL_EXTERN(_cthread_set_errno_self)
  69         // Restore the original stack
  70         movq    (%rsp),%rsp
  71         movq    $-1,%rax
  72         movq    $-1,%rdx /* in case a 128-bit value is returned */
  73         ret
  74
  75 #else
  76 #error Unsupported architecture
  77 #endif
  78
  79 #if defined(__i386__) || defined(__x86_64__)
  80
  81         .globl _i386_get_ldt
  82         ALIGN
  83 _i386_get_ldt:
  84         movl    $6,%eax
  85         MACHDEP_SYSCALL_TRAP
  86         jnb     2f
  87         jmp     cerror
  88 2:      ret
  89
  90
  91         .globl _i386_set_ldt
  92         ALIGN
  93 _i386_set_ldt:
  94         movl    $5,%eax
  95         MACHDEP_SYSCALL_TRAP
  96         jnb     2f
  97         jmp     cerror
  98 2:      ret
  99
 100 #endif