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5d3b4a7723
* sysdeps/hppa/linuxthreads/pspinlock.c: New file. * sysdeps/hppa/linuxthreads/pt-machine.h: Likewise. * sysdeps/hppa/linuxthreads/tls.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/aio_cancel.c: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/malloc-machine.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/pt-initfini.c: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/sysdep-cancel.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/bits/initspin.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/bits/pthreadtypes.h: Likewise.
135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
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hppa version.
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Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@tamu.edu>.
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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 Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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_MACHINE_H
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#define _PT_MACHINE_H 1
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#include <sys/types.h>
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#include <bits/initspin.h>
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#ifndef PT_EI
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# define PT_EI extern inline __attribute__ ((always_inline))
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#endif
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extern inline long int testandset (__atomic_lock_t *spinlock);
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extern inline int __compare_and_swap (long int *p, long int oldval, long int newval);
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extern inline int lock_held (__atomic_lock_t *spinlock);
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extern inline int __load_and_clear (__atomic_lock_t *spinlock);
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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__ ("%r30");
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/* Get/Set thread-specific pointer. We have to call into the kernel to
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* modify it, but we can read it in user mode. */
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#ifndef THREAD_SELF
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#define THREAD_SELF __get_cr27()
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#endif
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#ifndef SET_THREAD_SELF
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#define SET_THREAD_SELF(descr) __set_cr27(descr)
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#endif
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/* Use this to determine type */
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struct _pthread_descr_struct *__thread_self;
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static inline struct _pthread_descr_struct * __get_cr27(void)
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{
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long cr27;
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asm ("mfctl %%cr27, %0" : "=r" (cr27) : );
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return (struct _pthread_descr_struct *) cr27;
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}
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#ifndef INIT_THREAD_SELF
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#define INIT_THREAD_SELF(descr, nr) __set_cr27(descr)
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#endif
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static inline void __set_cr27(struct _pthread_descr_struct * cr27)
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{
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asm ( "ble 0xe0(%%sr2, %%r0)\n\t"
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"copy %0, %%r26"
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: : "r" (cr27) : "r26" );
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}
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/* We want the OS to assign stack addresses. */
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#define FLOATING_STACKS 1
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#define ARCH_STACK_MAX_SIZE 8*1024*1024
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/* The hppa only has one atomic read and modify memory operation,
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load and clear, so hppa spinlocks must use zero to signify that
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someone is holding the lock. The address used for the ldcw
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semaphore must be 16-byte aligned. */
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#define __ldcw(a) \
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({ \
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unsigned int __ret; \
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__asm__ __volatile__("ldcw 0(%1),%0" \
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: "=r" (__ret) : "r" (a) : "memory"); \
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__ret; \
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})
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/* Strongly ordered lock reset */
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#define __lock_reset(lock_addr, tmp) \
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({ \
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__asm__ __volatile__ ("stw,ma %1,0(%0)" \
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: : "r" (lock_addr), "r" (tmp) : "memory"); \
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})
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/* Because malloc only guarantees 8-byte alignment for malloc'd data,
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and GCC only guarantees 8-byte alignment for stack locals, we can't
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be assured of 16-byte alignment for atomic lock data even if we
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specify "__attribute ((aligned(16)))" in the type declaration. So,
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we use a struct containing an array of four ints for the atomic lock
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type and dynamically select the 16-byte aligned int from the array
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for the semaphore. */
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#define __PA_LDCW_ALIGNMENT 16
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#define __ldcw_align(a) ({ \
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volatile unsigned int __ret = (unsigned int) a; \
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if ((__ret & ~(__PA_LDCW_ALIGNMENT - 1)) < (unsigned int) a) \
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__ret = (__ret & ~(__PA_LDCW_ALIGNMENT - 1)) + __PA_LDCW_ALIGNMENT; \
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(unsigned int *) __ret; \
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})
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/* Spinlock implementation; required. */
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PT_EI int
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__load_and_clear (__atomic_lock_t *spinlock)
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{
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volatile unsigned int *a = __ldcw_align (spinlock);
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return __ldcw (a);
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}
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/* Emulate testandset */
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PT_EI long int
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testandset (__atomic_lock_t *spinlock)
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{
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return (__load_and_clear(spinlock) == 0);
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}
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PT_EI int
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lock_held (__atomic_lock_t *spinlock)
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{
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volatile unsigned int *a = __ldcw_align (spinlock);
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return *a == 0;
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}
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#endif /* pt-machine.h */
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