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

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    sparc version.
   3    Copyright (C) 1996, 1997, 1998 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 Library General Public License as
   9    published by the Free Software Foundation; either version 2 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    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library 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 /* Spinlock implementation; required.  */
  23 static inline int testandset(int *spinlock)
  24 {
  25   int ret;
  26
  27   __asm__ __volatile__("ldstub %1,%0"
  28         : "=r"(ret), "=m"(*spinlock)
  29         : "m"(*spinlock));
  30
  31   return ret;
  32 }
  33
  34
  35 /* Spinlock release; default is just set to zero.  */
  36 #define RELEASE(spinlock) \
  37   __asm__ __volatile__("stbar; stb %1,%0" : "=m"(*(spinlock)) : "r"(0));
  38
  39
  40 /* Get some notion of the current stack.  Need not be exactly the top
  41    of the stack, just something somewhere in the current frame.  */
  42 #define CURRENT_STACK_FRAME  stack_pointer
  43 register char * stack_pointer __asm__("%sp");
  44
  45
  46 /* Registers %g6 and %g7 are reserved by the ABI for "system use".  It
  47    happens that Solaris uses %g6 for the thread pointer -- we do the same.  */
  48 struct _pthread_descr_struct;
  49 register struct _pthread_descr_struct *__thread_self __asm__("%g6");
  50
  51 /* Return the thread descriptor for the current thread.  */
  52 #define THREAD_SELF  __thread_self
  53
  54 /* Initialize the thread-unique value.  */
  55 #define INIT_THREAD_SELF(descr, nr)  (__thread_self = (descr))
  56
  57 /* Access to data in the thread descriptor is easy.  */
  58 #define THREAD_GETMEM(descr, member) __thread_self->member
  59 #define THREAD_GETMEM_NC(descr, member) __thread_self->member
  60 #define THREAD_SETMEM(descr, member, value) __thread_self->member = (value)
  61 #define THREAD_SETMEM_NC(descr, member, value) __thread_self->member = (value)