arm: implement getfp

          --- old/usr/src/uts/arm/ml/arm_subr.s
          +++ new/usr/src/uts/arm/ml/arm_subr.s

   1    1  /*
   2    2   * This file and its contents are supplied under the terms of the
   3    3   * Common Development and Distribution License ("CDDL"), version 1.0.
   4    4   * You may only use this file in accordance with the terms of version
   5    5   * 1.0 of the CDDL.
   6    6   *
   7    7   * A full copy of the text of the CDDL should have accompanied this
   8    8   * source.  A copy of the CDDL is also available via the Internet at
   9    9   * http://www.illumos.org/license/CDDL.
  10   10   */
  11   11  
  12   12  /*
  13   13   * Copyright 2013 (c) Joyent, Inc. All rights reserved.
  14   14   */
  15   15  
  16   16  /*
  17   17   * This file contains various ARM subroutines that are generic across all ARM
  18   18   * platforms.
  19   19   */
  20   20  
  21   21  #include <sys/asm_linkage.h>
  22   22  
  23   23  #if defined(__lint)
  24   24  #include <sys/thread.h>
  25   25  #endif /* __lint */
  26   26  
  27   27  #if defined(__lint)
  28   28  
  29   29  /*
  30   30   * Return the current kernel thread that's running. Note that this is also
  31   31   * available as an inline function.
  32   32   */
  33   33  kthread_id_t
  34   34  threadp(void)
  35   35  { return ((kthread_id_t)0); }
  36   36  
  37   37  #else   /* __lint */
  38   38  
  39   39          ENTRY(threadp)
  40   40          mrc     p15, 0, r0, c13, c0, 4
  41   41          bx      lr
  42   42          SET_SIZE(threadp)
  43   43  
  44   44  #endif  /* __lint */
  45   45  
  46   46  #if defined(__lint)
  47   47  
  48   48  /*
  49   49   * Subroutine used to spin for a little bit
  50   50   */
  51   51  
  52   52  void
  53   53  arm_smt_pause(void)

  54   54  {}
  55   55  
  56   56  #else   /* __lint */
  57   57  
  58   58          ENTRY(arm_smt_pause)
  59   59          yield
  60   60          bx      lr
  61   61          SET_SIZE(arm_smt_pause)
  62   62  
  63   63  #endif  /* __lint */
       64 +
       65 +        ENTRY(getfp)
       66 +        mov     r0, r9
       67 +        bx      lr
       68 +        SET_SIZE(getfp)
    

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