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(__ppc__) || defined(__ppc64__)
  34
  35 /* We use mode-independent "g" opcodes such as "srgi", and/or
  36  * mode-independent macros such as MI_GET_ADDRESS.  These expand
  37  * into word operations when targeting __ppc__, and into doubleword
  38  * operations when targeting __ppc64__.
  39  */
  40 #include <architecture/ppc/mode_independent_asm.h>
  41
  42     .globl  _errno
  43
  44 MI_ENTRY_POINT(cerror)
  45     MI_PUSH_STACK_FRAME
  46     MI_GET_ADDRESS(r12,_errno)
  47     stw     r3,0(r12)               /* save syscall return code in global */
  48     MI_CALL_EXTERNAL(_cthread_set_errno_self)
  49     li      r3,-1                   /* then bug return value */
  50     li      r4,-1                   /* in case we're returning a long-long in 32-bit mode, etc */
  51     MI_POP_STACK_FRAME_AND_RETURN
  52
  53
  54     .globl _processor_facilities_used
  55     .align 2
  56 _processor_facilities_used:
  57     li  r0,0x7FF3
  58     sc
  59     blr
  60
  61 #elif defined(__i386__)
  62
  63         .globl  _errno
  64
  65 LABEL(cerror)
  66         REG_TO_EXTERN(%eax, _errno)
  67         mov             %esp,%edx
  68         andl    $0xfffffff0,%esp
  69         subl    $16,%esp
  70         movl    %edx,4(%esp)
  71         movl    %eax,(%esp)
  72         CALL_EXTERN(_cthread_set_errno_self)
  73         movl    4(%esp),%esp
  74         movl    $-1,%eax
  75         movl    $-1,%edx /* in case a 64-bit value is returned */
  76         ret
  77
  78         .private_extern __sysenter_trap
  79         ALIGN
  80 __sysenter_trap:
  81         popl %edx
  82         movl %esp, %ecx
  83         sysenter
  84
  85 #elif defined(__x86_64__)
  86
  87         .globl  _errno
  88
  89 LABEL(cerror)
  90         REG_TO_EXTERN(%rax, _errno)
  91         mov             %rsp,%rdx
  92         andq    $-16,%rsp
  93         subq    $16,%rsp
  94         // Preserve the original stack
  95         movq    %rdx,(%rsp)
  96         movq    %rax,%rdi
  97         CALL_EXTERN(_cthread_set_errno_self)
  98         // Restore the original stack
  99         movq    (%rsp),%rsp
 100         movq    $-1,%rax
 101         movq    $-1,%rdx /* in case a 128-bit value is returned */
 102         ret
 103
 104 #else
 105 #error Unsupported architecture
 106 #endif
 107
 108 #if defined(__i386__) || defined(__x86_64__)
 109
 110         .globl _i386_get_ldt
 111         ALIGN
 112 _i386_get_ldt:
 113         movl    $6,%eax
 114         MACHDEP_SYSCALL_TRAP
 115         jnb     2f
 116         jmp     cerror
 117 2:      ret
 118
 119
 120         .globl _i386_set_ldt
 121         ALIGN
 122 _i386_set_ldt:
 123         movl    $5,%eax
 124         MACHDEP_SYSCALL_TRAP
 125         jnb     2f
 126         jmp     cerror
 127 2:      ret
 128
 129 #endif