linuxthreads/sysdeps/sparc/sparc32/pt-machine.h

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    sparc version.
   3    Copyright (C) 1996-1998, 2000-2003 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 not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    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)
  40         : "m"(*spinlock));
  41
  42   return ret;
  43 }
  44
  45
  46 /* Memory barrier; default is to do nothing */
  47 #define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory")
  48
  49
  50 /* Get some notion of the current stack.  Need not be exactly the top
  51    of the stack, just something somewhere in the current frame.  */
  52 #define CURRENT_STACK_FRAME  (stack_pointer + (2 * 64))
  53 register char *stack_pointer __asm__("%sp");
  54
  55
  56 /* Registers %g6 and %g7 are reserved by the ABI for "system use".
  57    %g7 is specified in the TLS ABI as thread pointer -- we do the same.  */
  58 struct _pthread_descr_struct;
  59 register struct _pthread_descr_struct *__thread_self __asm__("%g7");
  60
  61 /* Return the thread descriptor for the current thread.  */
  62 #define THREAD_SELF  __thread_self
  63
  64 /* Initialize the thread-unique value.  */
  65 #define INIT_THREAD_SELF(descr, nr)  (__thread_self = (descr))
  66
  67 /* Access to data in the thread descriptor is easy.  */
  68 #define THREAD_GETMEM(descr, member) \
  69   ((void) sizeof (descr), THREAD_SELF->member)
  70 #define THREAD_GETMEM_NC(descr, member) \
  71   ((void) sizeof (descr), THREAD_SELF->member)
  72 #define THREAD_SETMEM(descr, member, value) \
  73   ((void) sizeof (descr), THREAD_SELF->member = (value))
  74 #define THREAD_SETMEM_NC(descr, member, value) \
  75   ((void) sizeof (descr), THREAD_SELF->member = (value))
  76
  77 /* We want the OS to assign stack addresses.  */
  78 #define FLOATING_STACKS 1
  79
  80 /* Maximum size of the stack if the rlimit is unlimited.  */
  81 #define ARCH_STACK_MAX_SIZE     8*1024*1024
  82
  83 #endif /* pt-machine.h */