arm/pthreads/thread_start.s

   1 /*
   2  * Copyright (c) 2009, 2011 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 #include <arm/arch.h>
  24
  25 #define __APPLE_API_PRIVATE
  26 #include <machine/cpu_capabilities.h>
  27 #undef  __APPLE_API_PRIVATE
  28
  29 // This routine is never called directly by user code, jumped from kernel
  30 // args 0 to 3 are already in the regs 0 to 3
  31 // should set stack with the 2 extra args before calling pthread_wqthread()
  32 // arg4 is in r[4]
  33 // arg5 is in r[5]
  34
  35         .text
  36         .align 2
  37         .globl _thread_start
  38 _thread_start:
  39     stmfd sp!, {r4, r5}
  40         bl __pthread_start
  41
  42 // Stackshots will show the routine that happens to link immediately following
  43 // _thread_start.  So we add an extra instruction (nop) to make stackshots
  44 // more readable.
  45         nop