libsyscall/wrappers/varargs_wrappers.s

   1 /*
   2  * Copyright (c) 2011-2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifdef __arm64__
  25
  26 #include "../custom/SYS.h"
  27 #include <mach/arm64/asm.h>
  28
  29 /*
  30  * Stubs are to handle the ARM64 ABI for variadic functions'
  31  * not matching the ABI used by the system call handler.
  32  */
  33
  34 /*
  35  *      sem_t* sem_open(const char *name, int oflag, ...);
  36  *      sem_t* __sem_open(const char *name, int oflag, int mode, int value);
  37  */
  38 MI_ENTRY_POINT(_sem_open)
  39         ARM64_STACK_PROLOG
  40         PUSH_FRAME
  41 #if __LP64__
  42         ldp     x2, x3, [fp, #16]
  43 #else
  44         ldp     w2, w3, [fp, #16]
  45 #endif
  46         MI_CALL_EXTERNAL(___sem_open)
  47 #if !__LP64__
  48         /* xnu returns a 64-bit '-1' on failure, but pointers must have the high
  49          * 32-bits set to zero. The following instruction is equivalent to
  50          * masking off the top 32-bits.
  51          */
  52         mov w0, w0
  53 #endif
  54         POP_FRAME
  55         ARM64_STACK_EPILOG
  56
  57 /*
  58  * int shm_open(const char *, int, ...);
  59  * int __shm_open(const char*, int oflag, int mode);
  60  */
  61 MI_ENTRY_POINT(_shm_open)
  62         ARM64_STACK_PROLOG
  63         PUSH_FRAME
  64 #if __LP64__
  65         ldr     x2, [fp, #16]
  66 #else
  67         ldr     w2, [fp, #16]
  68 #endif
  69         MI_CALL_EXTERNAL(___shm_open)
  70         POP_FRAME
  71         ARM64_STACK_EPILOG
  72
  73 /*
  74  * int msgsys(int, ...);
  75  * int __msgsys(int which, int a2, int a3, int a4, int a5);
  76  */
  77 MI_ENTRY_POINT(_msgsys)
  78         ARM64_STACK_PROLOG
  79         PUSH_FRAME
  80 #if __LP64__
  81         ldp     x1, x2, [fp, #16]
  82         ldp     x3, x4, [fp, #32]
  83 #else
  84         ldp     w1, w2, [fp, #16]
  85         ldp     w3, w4, [fp, #24]
  86 #endif
  87         MI_CALL_EXTERNAL(___msgsys)
  88         POP_FRAME
  89
  90 /*
  91  * int semsys(int, ...);
  92  * int __semsys(int which, int a2, int a3, int a4, int a5);
  93  */
  94 MI_ENTRY_POINT(_semsys)
  95         ARM64_STACK_PROLOG
  96         PUSH_FRAME
  97 #if __LP64__
  98         ldp     x1, x2, [fp, #16]
  99         ldp     x3, x4, [fp, #32]
 100 #else
 101         ldp     w1, w2, [fp, #16]
 102         ldp     w3, w4, [fp, #24]
 103 #endif
 104         MI_CALL_EXTERNAL(___semsys)
 105         POP_FRAME
 106         ARM64_STACK_EPILOG
 107
 108 /*
 109  * int  semctl(int, int, int, ...);
 110  * int __semctl(int semid, int semnum, int cmd, semun_t arg);
 111  */
 112  MI_ENTRY_POINT(_semctl)
 113         ARM64_STACK_PROLOG
 114         PUSH_FRAME
 115 #if __LP64__
 116         ldr     x3, [fp, #16]
 117 #else
 118         ldr     w3, [fp, #16]
 119 #endif
 120         MI_CALL_EXTERNAL(___semctl)
 121         POP_FRAME
 122         ARM64_STACK_EPILOG
 123
 124 /*
 125  * int  shmsys(int, ...);
 126  * int __shmsys(int which, int a2, int a3, int a4);
 127  */
 128  MI_ENTRY_POINT(_shmsys)
 129         ARM64_STACK_PROLOG
 130         PUSH_FRAME
 131 #if __LP64__
 132         ldp     x1, x2, [fp, #16]
 133         ldr     x3, [fp, #32]
 134 #else
 135         ldp     w1, w2, [fp, #16]
 136         ldr     w3, [fp, #24]
 137 #endif
 138         MI_CALL_EXTERNAL(___shmsys)
 139         POP_FRAME
 140         ARM64_STACK_EPILOG
 141
 142 #endif /* defined(__arm64__) */