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57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
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SuperH version.
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Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Niibe Yutaka <gniibe@m17n.org>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef PT_EI
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# define PT_EI extern inline
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#endif
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/* Spinlock implementation; required. */
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PT_EI long int
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testandset (int *spinlock)
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{
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int ret;
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__asm__ __volatile__(
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"tas.b @%1\n\t"
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"movt %0"
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: "=r" (ret)
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: "r" (spinlock)
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: "memory", "cc");
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return (ret == 0);
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}
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char * stack_pointer __asm__ ("r15");
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/* Return the thread descriptor for the current thread. */
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struct _pthread_descr_struct;
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#define THREAD_SELF \
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({ struct _pthread_descr_struct *self; \
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__asm__("stc gbr,%0" : "=r" (self)); self;})
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/* Initialize the thread-unique value. */
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#define INIT_THREAD_SELF(descr, nr) \
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({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));})
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