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/* Definition for thread-local data handling.
Copyright (C) 2022-2024 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 _LOONGARCH_TLS_H
#define _LOONGARCH_TLS_H 1
#include <dl-sysdep.h>
#ifndef __ASSEMBLER__
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <dl-dtv.h>
register void *__thread_self asm ("$tp");
#define READ_THREAD_POINTER() ({ __thread_self; })
/* Get system call information. */
#include <sysdep.h>
/* The TP points to the start of the thread blocks. */
#define TLS_DTV_AT_TP 1
#define TLS_TCB_AT_TP 0
/* Get the thread descriptor definition. */
#include <nptl/descr.h>
typedef struct
{
dtv_t *dtv;
void *private;
} tcbhead_t;
/* This is the size of the initial TCB. Because our TCB is before the thread
pointer, we don't need this. */
#define TLS_INIT_TCB_SIZE 0
/* Alignment requirements for the initial TCB. */
#define TLS_INIT_TCB_ALIGN __alignof__(struct pthread)
/* This is the size of the TCB. Because our TCB is before the thread
pointer, we don't need this. */
#define TLS_TCB_SIZE 0
/* Alignment requirements for the TCB. */
#define TLS_TCB_ALIGN __alignof__(struct pthread)
/* This is the size we need before TCB - actually, it includes the TCB. */
#define TLS_PRE_TCB_SIZE \
(sizeof (struct pthread) \
+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
/* The thread pointer tp points to the end of the TCB.
The pthread_descr structure is immediately in front of the TCB. */
#define TLS_TCB_OFFSET 0
/* 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))[-1].dtv = (dtvp) + 1)
/* Install new dtv for current thread. */
#define INSTALL_NEW_DTV(dtv) (THREAD_DTV () = (dtv))
/* Return dtv of given thread descriptor. */
#define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv)
/* Code to initially initialize the thread pointer. */
#define TLS_INIT_TP(tcbp) \
({ \
__thread_self = (char *) tcbp + TLS_TCB_OFFSET; \
true; \
})
/* Return the address of the dtv for the current thread. */
#define THREAD_DTV() \
(((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
/* Return the thread descriptor for the current thread. */
#define THREAD_SELF \
((struct pthread *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET \
- TLS_PRE_TCB_SIZE))
/* Value passed to 'clone' for initialization of the thread register. */
#define TLS_DEFINE_INIT_TP(tp, pd) \
void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE
/* Informs libthread_db that the thread pointer is register 2, which is used
* to know how to do THREAD_SELF. */
#define DB_THREAD_SELF \
REGISTER (64, 64, 2 * 8, -TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
/* Access to data in the thread descriptor is easy. */
# include <tcb-access.h>
/* l_tls_offset == 0 is perfectly valid, so we have to use some different
value to mean unset l_tls_offset. */
#define NO_TLS_OFFSET -1
/* Get and set the global scope generation counter in struct pthread. */
#define THREAD_GSCOPE_IN_TCB 1
#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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