ports/sysdeps/am33/linuxthreads/pt-machine.h

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    am33 version.
   3    Copyright (C) 1996-2014 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Alexandre Oliva <aoliva@redhat.com>
   6    Based on ../i386/pt-machine.h.
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Library General Public License as
  10    published by the Free Software Foundation; either version 2 of the
  11    License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Library General Public License for more details.
  17
  18    You should have received a copy of the GNU Library General Public
  19    License along with the GNU C Library.  If not, see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef _PT_MACHINE_H
  23 #define _PT_MACHINE_H   1
  24
  25 #ifndef __ASSEMBLER__
  26 #ifndef PT_EI
  27 # define PT_EI extern inline
  28 #endif
  29
  30 /* Get some notion of the current stack.  Need not be exactly the top
  31    of the stack, just something somewhere in the current frame.  */
  32 #define CURRENT_STACK_FRAME  __builtin_frame_address (0)
  33
  34 /* Spinlock implementation; required.  */
  35 PT_EI long int
  36 testandset (int *spinlock)
  37 {
  38   long int ret = 1;
  39
  40   /* This won't test&set the entire int, only the least significant
  41      byte.  I hope this doesn't matter, since we can't do better.  */
  42   __asm__ __volatile__ ("bset %0, %1; bne 1f; clr %0; 1:" :
  43                         "+d" (ret), "+m" (*(volatile int *)spinlock));
  44
  45   return ret;
  46 }
  47
  48
  49 PT_EI int
  50 get_eflags (void)
  51 {
  52   int res;
  53   __asm__ __volatile__ ("mov psw,%0" : "=d" (res));
  54   return res;
  55 }
  56
  57
  58 PT_EI void
  59 set_eflags (int newflags)
  60 {
  61   __asm__ __volatile__ ("mov %0,psw" : : "d" (newflags) : "cc");
  62 }
  63
  64 #endif /* __ASSEMBLER__ */
  65
  66 #endif /* pt-machine.h */