osfmk/ppc/commpage/pthread.s

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 #include <sys/appleapiopts.h>
  27 #include <ppc/asm.h>                                    // EXT, LEXT
  28 #include <machine/cpu_capabilities.h>
  29 #include <machine/commpage.h>
  30
  31         .text
  32         .align  2
  33         .globl  EXT(pthread_getspecific_sprg3)
  34         .globl  EXT(pthread_getspecific_uftrap)
  35         .globl  EXT(pthread_self_sprg3)
  36         .globl  EXT(pthread_self_uftrap)
  37
  38 #define USER_SPRG3      259             // user-mode-readable encoding for SPRG3
  39
  40
  41 // *****************************************************
  42 // * P T H R E A D _ G E T S P E C I F I C _ S P R G 3 *
  43 // *****************************************************
  44 //
  45 // For processors with user-readable SPRG3.   Called with:
  46 //              r3 = word number
  47 //              r4 = offset to thread specific data (_PTHREAD_TSD_OFFSET)
  48
  49 pthread_getspecific_sprg3:
  50         slwi    r5,r3,2                         // convert word# to byte offset
  51         mfspr   r3,USER_SPRG3           // get per-thread cookie
  52         add             r5,r5,r4                        // add in offset to first word
  53         lwzx    r3,r3,r5                        // get the thread-specific word
  54         blr
  55
  56     COMMPAGE_DESCRIPTOR(pthread_getspecific_sprg3,_COMM_PAGE_PTHREAD_GETSPECIFIC,k64Bit,0,0)
  57
  58
  59 // ***************************************
  60 // * P T H R E A D _ S E L F _ S P R G 3 *
  61 // ***************************************
  62 //
  63 // For processors with user-readable SPRG3.
  64
  65 pthread_self_sprg3:
  66         mfspr   r3,USER_SPRG3           // get per-thread cookie
  67         blr
  68
  69     COMMPAGE_DESCRIPTOR(pthread_self_sprg3,_COMM_PAGE_PTHREAD_SELF,k64Bit,0,0)
  70
  71
  72 // *******************************************************
  73 // * P T H R E A D _ G E T S P E C I F I C _ U F T R A P *
  74 // *******************************************************
  75 //
  76 // For processors that use the Ultra-Fast-Trap to get the thread-specific ptr.
  77 // Called with:
  78 //              r3 = word number
  79 //              r4 = offset to thread specific data (_PTHREAD_TSD_OFFSET)
  80
  81 pthread_getspecific_uftrap:
  82         slwi    r5,r3,2                         // convert word# to byte offset
  83         li              r0,0x7FF2                       // magic "pthread_self" ultra-fast trap code
  84         sc
  85         add             r5,r5,r4                        // add in offset to first word
  86         lwzx    r3,r3,r5                        // get the thread-specific word
  87         blr
  88
  89     COMMPAGE_DESCRIPTOR(pthread_getspecific_uftrap,_COMM_PAGE_PTHREAD_GETSPECIFIC,0,k64Bit,0)
  90
  91
  92 // *****************************************
  93 // * P T H R E A D _ S E L F _ U F T R A P *
  94 // *****************************************
  95 //
  96 // For processors that use the Ultra-Fast-Trap to get the thread-specific ptr.
  97
  98 pthread_self_uftrap:
  99         li              r0,0x7FF2                       // magic "pthread_self" ultra-fast trap code
 100         sc                                                      // get r3==TLDP
 101         blr
 102
 103     COMMPAGE_DESCRIPTOR(pthread_self_uftrap,_COMM_PAGE_PTHREAD_SELF,0,k64Bit,0)