linuxthreads/sysdeps/sparc/sparc64/pt-machine.h

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    Sparc v9 version.
   3    Copyright (C) 1997-2002, 2003 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Richard Henderson <rth@tamu.edu>.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public License as
   9    published by the Free Software Foundation; either version 2.1 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If
  19    not, write to the Free Software Foundation, Inc.,
  20    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _PT_MACHINE_H
  23 #define _PT_MACHINE_H   1
  24
  25 #ifndef PT_EI
  26 # define PT_EI extern inline __attribute__ ((always_inline))
  27 #endif
  28
  29 extern long int testandset (int *spinlock);
  30 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  31
  32 /* Spinlock implementation; required.  */
  33 PT_EI long int
  34 testandset (int *spinlock)
  35 {
  36   int ret;
  37
  38   __asm__ __volatile__("ldstub %1,%0"
  39         : "=r" (ret), "=m" (*spinlock) : "m" (*spinlock));
  40
  41   return ret;
  42 }
  43
  44
  45 /* Memory barrier; default is to do nothing */
  46 #define MEMORY_BARRIER() \
  47      __asm__ __volatile__("membar #LoadLoad | #LoadStore | #StoreLoad | #StoreStore" : : : "memory")
  48 /* Read barrier.  */
  49 #define READ_MEMORY_BARRIER() \
  50      __asm__ __volatile__("membar #LoadLoad | #LoadStore" : : : "memory")
  51 /* Write barrier.  */
  52 #define WRITE_MEMORY_BARRIER() \
  53      __asm__ __volatile__("membar #StoreLoad | #StoreStore" : : : "memory")
  54
  55
  56 /* Get some notion of the current stack.  Need not be exactly the top
  57    of the stack, just something somewhere in the current frame.  */
  58 #define CURRENT_STACK_FRAME  (stack_pointer + (2 * 128))
  59 register char *stack_pointer __asm__ ("%sp");
  60
  61
  62 /* Registers %g6 and %g7 are reserved by the ABI for "system use".  The
  63    TLS ABI specifies %g7 as the thread pointer.  */
  64 struct _pthread_descr_struct;
  65 register struct _pthread_descr_struct *__thread_self __asm__ ("%g7");
  66
  67 /* Return the thread descriptor for the current thread.  */
  68 #define THREAD_SELF  __thread_self
  69
  70 /* Initialize the thread-unique value.  */
  71 #define INIT_THREAD_SELF(descr, nr)  (__thread_self = (descr))
  72
  73
  74 /* Compare-and-swap for semaphores. */
  75
  76 #define HAS_COMPARE_AND_SWAP
  77 PT_EI int
  78 __compare_and_swap (long int *p, long int oldval, long int newval)
  79 {
  80   long int readval;
  81
  82   __asm__ __volatile__ ("casx   [%4], %2, %0"
  83                         : "=r"(readval), "=m"(*p)
  84                         : "r"(oldval), "m"(*p), "r"(p), "0"(newval));
  85   MEMORY_BARRIER();
  86   return readval == oldval;
  87 }
  88
  89 /* Access to data in the thread descriptor is easy.  */
  90 #define THREAD_GETMEM(descr, member) \
  91   ((void) sizeof (descr), THREAD_SELF->member)
  92 #define THREAD_GETMEM_NC(descr, member) \
  93   ((void) sizeof (descr), THREAD_SELF->member)
  94 #define THREAD_SETMEM(descr, member, value) \
  95   ((void) sizeof (descr), THREAD_SELF->member = (value))
  96 #define THREAD_SETMEM_NC(descr, member, value) \
  97   ((void) sizeof (descr), THREAD_SELF->member = (value))
  98
  99 /* We want the OS to assign stack addresses.  */
 100 #define FLOATING_STACKS 1
 101
 102 /* Maximum size of the stack if the rlimit is unlimited.  */
 103 #define ARCH_STACK_MAX_SIZE     32*1024*1024
 104
 105 #endif /* pt-machine.h */