toolchain/uClibc/patches-0.9.28/411-libpthread-avr32.patch

   1 Subject: [PATCH] libpthread: AVR32 support
   2
   3 Implement pt-machine.h for AVR32.
   4 ---
   5
   6  libpthread/linuxthreads/sysdeps/avr32/pt-machine.h |   92 +++++++++++++++++++++
   7  1 file changed, 92 insertions(+)
   8
   9 Index: uClibc-0.9.28/libpthread/linuxthreads/sysdeps/avr32/pt-machine.h
  10 ===================================================================
  11 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  12 +++ uClibc-0.9.28/libpthread/linuxthreads/sysdeps/avr32/pt-machine.h    2006-02-07 17:14:47.000000000 +0100
  13 @@ -0,0 +1,92 @@
  14 +/* Machine-dependent pthreads configuration and inline functions.
  15 +
  16 +   Copyright (C) 2005 Atmel Norway
  17 +   This file is part of the GNU C Library.
  18 +
  19 +   The GNU C Library is free software; you can redistribute it and/or
  20 +   modify it under the terms of the GNU Lesser General Public License as
  21 +   published by the Free Software Foundation; either version 2.1 of the
  22 +   License, or (at your option) any later version.
  23 +
  24 +   The GNU C Library is distributed in the hope that it will be useful,
  25 +   but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  27 +   Lesser General Public License for more details.
  28 +
  29 +   You should have received a copy of the GNU Lesser General Public
  30 +   License along with the GNU C Library; see the file COPYING.LIB.  If not,
  31 +   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  32 +   Boston, MA 02111-1307, USA.  */
  33 +
  34 +#ifndef _PT_MACHINE_H
  35 +#define _PT_MACHINE_H   1
  36 +
  37 +#include <features.h>
  38 +
  39 +static inline int
  40 +_test_and_set (int *p, int v) __THROW
  41 +{
  42 +       int result;
  43 +
  44 +       __asm__ __volatile__(
  45 +               "/* Inline test and set */\n"
  46 +               "1:     ssrf    5\n"
  47 +               "       ld.w    %0, %2\n"
  48 +               "       tst     %0, %3\n"
  49 +               "       breq    2f\n"
  50 +               "       stcond  %1, %3\n"
  51 +               "       brne    1b\n"
  52 +               "2:"
  53 +               : "=&r"(result), "=m"(*p)
  54 +               : "m"(*p), "r"(v)
  55 +               : "memory", "cc");
  56 +
  57 +       return result;
  58 +}
  59 +
  60 +#ifndef PT_EI
  61 +# define PT_EI extern inline
  62 +#endif
  63 +
  64 +extern long int testandset (int *spinlock);
  65 +extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  66 +
  67 +/* Spinlock implementation; required.  */
  68 +PT_EI long int
  69 +testandset (int *spinlock)
  70 +{
  71 +       return _test_and_set(spinlock, 1);
  72 +}
  73 +
  74 +
  75 +/* Get some notion of the current stack.  Need not be exactly the top
  76 +   of the stack, just something somewhere in the current frame.  */
  77 +#define CURRENT_STACK_FRAME  stack_pointer
  78 +register char * stack_pointer __asm__ ("sp");
  79 +
  80 +/* Compare-and-swap for semaphores. */
  81 +
  82 +#define HAS_COMPARE_AND_SWAP
  83 +PT_EI int
  84 +__compare_and_swap(long int *p, long int oldval, long int newval)
  85 +{
  86 +       long int result, tmp;
  87 +
  88 +       __asm__ __volatile__(
  89 +               "/* Inline compare and swap */\n"
  90 +               "1:     ssrf    5\n"
  91 +               "       ld.w    %1, %3\n"
  92 +               "       cp.w    %1, %5\n"
  93 +               "       sreq    %0\n"
  94 +               "       brne    2f\n"
  95 +               "       stcond  %2, %4\n"
  96 +               "       brne    1b\n"
  97 +               "2:"
  98 +               : "=&r"(result), "=&r"(tmp), "=m"(*p)
  99 +               : "m"(*p), "r"(newval), "r"(oldval)
 100 +               : "cc", "memory");
 101 +
 102 +       return result;
 103 +}
 104 +
 105 +#endif /* pt-machine.h */