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/* Definition for thread-local data handling. NPTL/SH version.
Copyright (C) 2003 Free Software Foundation, Inc.
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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _TLS_H
#define _TLS_H
# include <dl-sysdep.h>
#ifndef __ASSEMBLER__
# include <stddef.h>
# include <stdint.h>
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
void *pointer;
} dtv_t;
typedef struct
{
dtv_t *dtv;
void *private;
} tcbhead_t;
# define TLS_MULTIPLE_THREADS_IN_TCB 1
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
/* We require TLS support in the tools. */
#ifndef HAVE_TLS_SUPPORT
# error "TLS support is required."
#endif
/* Signal that TLS support is available. */
# define USE_TLS 1
#ifndef __ASSEMBLER__
/* Get system call information. */
# include <sysdep.h>
/* This is the size of the initial TCB. */
# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
/* Alignment requirements for the initial TCB. */
# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
/* This is the size of the TCB. */
# define TLS_TCB_SIZE sizeof (tcbhead_t)
/* This is the size we need before TCB. */
# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
/* Alignment requirements for the TCB. */
# define TLS_TCB_ALIGN __alignof__ (struct pthread)
/* The TLS blocks start right after the TCB. */
# define TLS_DTV_AT_TP 1
/* Get the thread descriptor definition. */
# include <nptl/descr.h>
/* Install the dtv pointer. The pointer passed is to the element with
index -1 which contain the length. */
# define INSTALL_DTV(tcbp, dtvp) \
((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(dtv) \
({ tcbhead_t *__tcbp; \
__asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
__tcbp->dtv = (dtv);})
/* Return dtv of given thread descriptor. */
# define GET_DTV(tcbp) \
(((tcbhead_t *) (tcbp))->dtv)
/* Code to initially initialize the thread pointer. This might need
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp, secondcall) \
({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; })
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
({ tcbhead_t *__tcbp; \
__asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
__tcbp->dtv;})
/* Return the thread descriptor for the current thread.
The contained asm must *not* be marked volatile since otherwise
assignments like
struct pthread *self = thread_self();
do not get optimized away. */
# define THREAD_SELF \
({ struct pthread *__self; \
__asm ("stc gbr,%0" : "=r" (__self)); \
__self - 1;})
/* Identifier for the current thread. THREAD_SELF is usable but
sometimes more expensive than necessary as in this case. */
# define THREAD_ID \
({ struct pthread *__self; \
__asm ("stc gbr,%0" : "=r" (__self)); \
__self;})
/* Read member of the thread descriptor directly. */
# define THREAD_GETMEM(descr, member) (descr->member)
/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
# define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx])
/* Set member of the thread descriptor directly. */
# define THREAD_SETMEM(descr, member, value) \
descr->member = (value)
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
# define THREAD_SETMEM_NC(descr, member, idx, value) \
descr->member[idx] = (value)
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
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