139 lines
4.3 KiB
C
139 lines
4.3 KiB
C
|
/* Definition for thread-local data handling.
|
||
|
|
Copyright (C) 2022 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; \
|
||
|
|
NULL; \
|
||
|
|
})
|
||
|
|
|
||
|
|
/* 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_rel (&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 */
|