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/* Machine-dependent pthreads configuration and inline functions.
S390 version.
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef PT_EI
# define PT_EI extern inline
#endif
extern long int testandset (int *spinlock);
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
/* For multiprocessor systems, we want to ensure all memory accesses
are completed before we reset a lock. On other systems, we still
need to make sure that the compiler has flushed everything to memory. */
#define MEMORY_BARRIER() __asm__ __volatile__ ("bcr 15,0" : : : "memory")
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
int ret;
__asm__ __volatile__(
" la 1,%1\n"
" lhi 0,1\n"
" l %0,%1\n"
"0: cs %0,0,0(1)\n"
" jl 0b"
: "=&d" (ret), "+m" (*spinlock)
: : "0", "1", "cc");
return ret;
}
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
#define CURRENT_STACK_FRAME stack_pointer
register char * stack_pointer __asm__ ("15");
/* Return the thread descriptor for the current thread.
S/390 registers uses access register 0 as "thread register". */
#define THREAD_SELF ({ \
register pthread_descr __self; \
__asm__ ("ear %0,%%a0" : "=d" (__self) ); \
__self; \
})
/* Initialize the thread-unique value. */
#define INIT_THREAD_SELF(descr, nr) ({ \
__asm__ ("sar %%a0,%0" : : "d" (descr) ); \
})
/* Access to data in the thread descriptor is easy. */
#define THREAD_GETMEM(descr, member) THREAD_SELF->member
#define THREAD_GETMEM_NC(descr, member) THREAD_SELF->member
#define THREAD_SETMEM(descr, member, value) THREAD_SELF->member = (value)
#define THREAD_SETMEM_NC(descr, member, value) THREAD_SELF->member = (value)
/* We want the OS to assign stack addresses. */
#define FLOATING_STACKS 1
/* Maximum size of the stack if the rlimit is unlimited. */
#define ARCH_STACK_MAX_SIZE 8*1024*1024
/* Compare-and-swap for semaphores. */
#define HAS_COMPARE_AND_SWAP
PT_EI int
__compare_and_swap(long int *p, long int oldval, long int newval)
{
int retval;
__asm__ __volatile__(
" la 1,%1\n"
" lr 0,%2\n"
" cs 0,%3,0(1)\n"
" ipm %0\n"
" srl %0,28\n"
"0:"
: "=&d" (retval), "+m" (*p)
: "d" (oldval) , "d" (newval)
: "cc", "0", "1" );
return retval == 0;
}
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