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/* Definitions for thread-local data handling. linuxthreads/Alpha version.
Copyright (C) 2002, 2003, 2005 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _TLS_H
#define _TLS_H
#ifndef __ASSEMBLER__
# include <pt-machine.h>
# include <stdbool.h>
# include <stddef.h>
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
struct
{
void *val;
bool is_static;
} pointer;
} dtv_t;
typedef struct
{
dtv_t *dtv;
/* Reserved for the thread implementation. Unused in LinuxThreads. */
void *private;
} tcbhead_t;
#endif
#ifdef HAVE_TLS_SUPPORT
/* Signal that TLS support is available. */
# define USE_TLS 1
# ifndef __ASSEMBLER__
/* Get system call information. */
# include <sysdep.h>
/* This is the size of the initial TCB. */
# define TLS_INIT_TCB_SIZE 0
/* Alignment requirements for the initial TCB. */
# define TLS_INIT_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
/* This is the size of the TCB. */
# define TLS_TCB_SIZE 0
/* Alignment requirements for the TCB. */
# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
/* This is the size we need before TCB. */
# ifndef IS_IN_rtld
# define TLS_PRE_TCB_SIZE \
(sizeof (struct _pthread_descr_struct) \
+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
# else
# include <nptl-struct-pthread.h>
# define TLS_PRE_TCB_SIZE \
((sizeof (struct _pthread_descr_struct) > NPTL_STRUCT_PTHREAD_SIZE \
? sizeof (struct _pthread_descr_struct) : NPTL_STRUCT_PTHREAD_SIZE) \
+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
# endif
/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
# define TLS_DTV_AT_TP 1
/* The following assumes that TP (R2 or R13) points to the end of the
TCB + 0x7000 (per the ABI). This implies that TCB address is
TP - 0x7000. As we define TLS_DTV_AT_TP we can
assume that the pthread struct is allocated immediately ahead of the
TCB. This implies that the pthread_descr address is
TP - (TLS_PRE_TCB_SIZE + 0x7000). */
/* ??? PPC uses offset 0x7000; seems like a good idea for alpha too,
but binutils not yet changed to match. */
# 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. 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, SECONDCALL) \
(__builtin_set_thread_pointer ((void *) (TCBP) + TLS_TCB_OFFSET), NULL)
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
(((tcbhead_t *) (__builtin_thread_pointer () - TLS_TCB_OFFSET))[-1].dtv)
/* Return the thread descriptor for the current thread. */
# undef THREAD_SELF
# define THREAD_SELF \
((pthread_descr) (__builtin_thread_pointer () \
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
# undef INIT_THREAD_SELF
# define INIT_THREAD_SELF(DESCR, NR) \
__builtin_set_thread_pointer ((char *)(DESCR) \
+ TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
/* Get the thread descriptor definition. */
# include <linuxthreads/descr.h>
/* ??? Generic bits of LinuxThreads may call these macros with
DESCR set to NULL. We are expected to be able to reference
the "current" value.
In our case, we'd really prefer to use DESCR, since lots of
PAL_code calls would be expensive. We can only trust that
the compiler does its job and unifies the multiple
__builtin_thread_pointer instances. */
#define THREAD_GETMEM(descr, member) \
((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_GETMEM_NC(descr, member) \
((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_SETMEM(descr, member, value) \
((void) sizeof (descr), THREAD_SELF->member = (value))
#define THREAD_SETMEM_NC(descr, member, value) \
((void) sizeof (descr), THREAD_SELF->member = (value))
# endif /* HAVE_TLS_SUPPORT */
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
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