sysdeps/am33/linuxthreads/pt-machine.h

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    am33 version.
   3    Copyright (C) 1996,1997,1998,1999,2000,2001, 2004
   4    Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6    Contributed by Alexandre Oliva <aoliva@redhat.com>
   7    Based on ../i386/pt-machine.h.
   8
   9    The GNU C Library is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU Library General Public License as
  11    published by the Free Software Foundation; either version 2 of the
  12    License, or (at your option) any later version.
  13
  14    The GNU C Library is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    Library General Public License for more details.
  18
  19    You should have received a copy of the GNU Library General Public
  20    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  21    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #ifndef _PT_MACHINE_H
  25 #define _PT_MACHINE_H   1
  26
  27 #ifndef __ASSEMBLER__
  28 #ifndef PT_EI
  29 # define PT_EI extern inline
  30 #endif
  31
  32 /* Get some notion of the current stack.  Need not be exactly the top
  33    of the stack, just something somewhere in the current frame.  */
  34 #define CURRENT_STACK_FRAME  __builtin_frame_address (0)
  35
  36 /* Spinlock implementation; required.  */
  37 PT_EI long int
  38 testandset (int *spinlock)
  39 {
  40   long int ret = 1;
  41
  42   /* This won't test&set the entire int, only the least significant
  43      byte.  I hope this doesn't matter, since we can't do better.  */
  44   __asm__ __volatile__ ("bset %0, %1; bne 1f; clr %0; 1:" :
  45                         "+d" (ret), "+m" (*(volatile int *)spinlock));
  46
  47   return ret;
  48 }
  49
  50
  51 PT_EI int
  52 get_eflags (void)
  53 {
  54   int res;
  55   __asm__ __volatile__ ("mov psw,%0" : "=d" (res));
  56   return res;
  57 }
  58
  59
  60 PT_EI void
  61 set_eflags (int newflags)
  62 {
  63   __asm__ __volatile__ ("mov %0,psw" : : "d" (newflags) : "cc");
  64 }
  65
  66 #endif /* __ASSEMBLER__ */
  67
  68 #endif /* pt-machine.h */