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/* Definition for thread-local data handling. nptl/IA-64 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 1
#include <dl-sysdep.h>
#ifndef __ASSEMBLER__
# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
# include <stdlib.h>
# include <list.h>
# include <dl-dtv.h>
typedef struct
{
dtv_t *dtv;
void *__private;
} tcbhead_t;
register struct pthread *__thread_self __asm__("r13");
# define TLS_MULTIPLE_THREADS_IN_TCB 1
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif
/* Alignment requirement for the stack. */
#define STACK_ALIGN 16
#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.
If there is not any room for uintptr_t stack_guard and
uintptr_t pointer_guard in struct pthread's final padding,
we need to put struct pthread 16 byte slower. */
# define TLS_PRE_TCB_SIZE \
(sizeof (struct pthread) \
+ (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t) \
? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1) \
& ~(__alignof__ (struct pthread) - 1)) \
: 0))
/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
# 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(descr, dtvp) \
((tcbhead_t *) (descr))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(DTV) \
(((tcbhead_t *)__thread_self)->dtv = (DTV))
/* Return dtv of given thread descriptor. */
# define GET_DTV(descr) \
(((tcbhead_t *) (descr))->dtv)
#define THREAD_SELF_SYSINFO (((tcbhead_t *) __thread_self)->__private)
#define THREAD_SYSINFO(pd) \
(((tcbhead_t *) ((char *) (pd) + TLS_PRE_TCB_SIZE))->__private)
#ifdef NEED_DL_SYSINFO
# define INIT_SYSINFO THREAD_SELF_SYSINFO = (void *) GLRO(dl_sysinfo)
# define SETUP_THREAD_SYSINFO(pd) \
(THREAD_SYSINFO (pd) = THREAD_SELF_SYSINFO)
# define CHECK_THREAD_SYSINFO(pd) \
assert (THREAD_SYSINFO (pd) == THREAD_SELF_SYSINFO)
#else
# define INIT_SYSINFO NULL
#endif
/* 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(thrdescr) \
(__thread_self = (thrdescr), INIT_SYSINFO, true)
/* Value passed to 'clone2' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) \
void *tp = (char *) (pd) + TLS_PRE_TCB_SIZE
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
(((tcbhead_t *)__thread_self)->dtv)
/* Return the thread descriptor for the current thread. */
# define THREAD_SELF \
((struct pthread *) ((char *) __thread_self - TLS_PRE_TCB_SIZE))
/* Magic for libthread_db to know how to do THREAD_SELF. */
# define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -TLS_PRE_TCB_SIZE)
# include <tcb-access.h>
/* Set the stack guard field in TCB head. */
#define THREAD_SET_STACK_GUARD(value) \
(((uintptr_t *) __thread_self)[-1] = (value))
#define THREAD_COPY_STACK_GUARD(descr) \
(((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-1] \
= ((uintptr_t *) __thread_self)[-1])
/* Set the pointer guard field in TCB head. */
#define THREAD_GET_POINTER_GUARD() \
(((uintptr_t *) __thread_self)[-2])
#define THREAD_SET_POINTER_GUARD(value) \
(((uintptr_t *) __thread_self)[-2] = (value))
#define THREAD_COPY_POINTER_GUARD(descr) \
(((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-2] \
= THREAD_GET_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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