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/* Definition for thread-local data handling. linuxthreads/SH version.
Copyright (C) 2002, 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>
# include <pt-machine.h>
#ifndef __ASSEMBLER__
# include <stddef.h>
# include <stdint.h>
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
void *pointer;
} dtv_t;
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
/* We can support TLS only if the floating-stack support is available. */
#if defined HAVE_TLS_SUPPORT \
&& (defined FLOATING_STACKS || !defined IS_IN_libpthread)
/* Signal that TLS support is available. */
# define USE_TLS 1
# ifndef __ASSEMBLER__
typedef struct
{
dtv_t *dtv;
void *private;
} tcbhead_t;
/* 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_descr_struct)
/* Alignment requirements for the TCB. */
# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
/* The TLS blocks start right after the TCB. */
# define TLS_DTV_AT_TP 1
/* 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. */
# undef THREAD_SELF
# define THREAD_SELF \
({ struct _pthread_descr_struct *__self; \
__asm ("stc gbr,%0" : "=r" (__self)); \
__self - 1;})
# undef INIT_THREAD_SELF
# define INIT_THREAD_SELF(descr, nr) \
({ struct _pthread_descr_struct *__self = (void *) descr; \
__asm __volatile ("ldc %0,gbr" : : "r" (__self + 1)); \
0; })
/* Get the thread descriptor definition. This must be after the
the definition of THREAD_SELF for TLS. */
# include <linuxthreads/descr.h>
# endif /* __ASSEMBLER__ */
#else
# ifndef __ASSEMBLER__
typedef struct
{
void *tcb;
dtv_t *dtv;
void *self;
int multiple_threads;
} tcbhead_t;
/* Get the thread descriptor definition. */
# include <linuxthreads/descr.h>
# define NONTLS_INIT_TP \
do { \
static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 }; \
__asm __volatile ("ldc %0,gbr" : : "r" (&nontls_init_tp)); \
} while (0)
# endif /* __ASSEMBLER__ */
#endif /* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */
#endif /* tls.h */
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