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/* Definition for thread-local data handling. NPTL/SH version.
Copyright (C) 2003-2024 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, see
<https://www.gnu.org/licenses/>. */
#ifndef _TLS_H
#define _TLS_H
# include <dl-sysdep.h>
#ifndef __ASSEMBLER__
# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
# include <stdlib.h>
# include <list.h>
# include <sysdep.h>
# include <dl-dtv.h>
typedef struct
{
dtv_t *dtv;
uintptr_t pointer_guard;
} tcbhead_t;
# define TLS_MULTIPLE_THREADS_IN_TCB 1
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
#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)
/* 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)
/* The TLS blocks start right after the TCB. */
# define TLS_DTV_AT_TP 1
# define TLS_TCB_AT_TP 0
/* 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) \
({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); true; })
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
/* 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;})
/* Magic for libthread_db to know how to do THREAD_SELF. */
# define DB_THREAD_SELF \
REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread))
# include <tcb-access.h>
#define THREAD_GET_POINTER_GUARD() \
({ tcbhead_t *__tcbp; \
__asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
__tcbp->pointer_guard;})
#define THREAD_SET_POINTER_GUARD(value) \
({ tcbhead_t *__tcbp; \
__asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
__tcbp->pointer_guard = (value);})
#define THREAD_COPY_POINTER_GUARD(descr) \
({ tcbhead_t *__tcbp; \
__asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;})
/* Get and set the global scope generation counter in struct pthread. */
#define THREAD_GSCOPE_FLAG_UNUSED 0
#define THREAD_GSCOPE_FLAG_USED 1
#define THREAD_GSCOPE_FLAG_WAIT 2
#define THREAD_GSCOPE_RESET_FLAG() \
do \
{ int __res \
= atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \
THREAD_GSCOPE_FLAG_UNUSED); \
if (__res == THREAD_GSCOPE_FLAG_WAIT) \
lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
} \
while (0)
#define THREAD_GSCOPE_SET_FLAG() \
do \
{ \
THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
atomic_write_barrier (); \
} \
while (0)
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
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