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/* Definition for thread-local data handling. NPTL/hppa version.
Copyright (C) 2005-2021 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 <dl-dtv.h>
#endif /* __ASSEMBLER__ */
#ifndef __ASSEMBLER__
/* 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. */
# 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)
/* 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 = (tcbhead_t *)__get_cr27(); \
__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) \
({ __set_cr27(tcbp); NULL; })
/* Value passed to 'clone' for initialization of the thread register. */
# 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 = (tcbhead_t *)__get_cr27(); \
__tcbp->dtv; \
})
/* Return the thread descriptor for the current thread. */
# define THREAD_SELF \
({ struct pthread *__self; \
__self = __get_cr27(); \
__self - 1; \
})
/* Magic for libthread_db to know how to do THREAD_SELF.
Our thread pointer is stored in cr27. See asm/elf.h for the offset into
elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */
# define DB_THREAD_SELF \
REGISTER (32, 32, 53 * 4, -sizeof (struct pthread))
# include <tcb-access.h>
static inline struct pthread *__get_cr27(void)
{
long cr27;
asm ("mfctl %%cr27, %0" : "=r" (cr27) : );
return (struct pthread *) cr27;
}
/* We write to cr27, clobber r26 as the input argument, and clobber
r31 as the link register. */
static inline void __set_cr27(struct pthread *cr27)
{
asm ( "ble 0xe0(%%sr2, %%r0)\n\t"
"copy %0, %%r26"
: : "r" (cr27) : "r26", "r31" );
}
/* 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_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 */
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