mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
TLS access definitions for Alpha.
This commit is contained in:
parent
cb9d4969c9
commit
690359671c
146
sysdeps/alpha/nptl/tls.h
Normal file
146
sysdeps/alpha/nptl/tls.h
Normal file
@ -0,0 +1,146 @@
|
|||||||
|
/* Definition for thread-local data handling. NPTL/Alpha version.
|
||||||
|
Copyright (C) 2003 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 1
|
||||||
|
|
||||||
|
# include <dl-sysdep.h>
|
||||||
|
|
||||||
|
#ifndef __ASSEMBLER__
|
||||||
|
# include <stddef.h>
|
||||||
|
# include <stdint.h>
|
||||||
|
|
||||||
|
/* Type for the dtv. */
|
||||||
|
typedef union dtv
|
||||||
|
{
|
||||||
|
size_t counter;
|
||||||
|
void *pointer;
|
||||||
|
} dtv_t;
|
||||||
|
|
||||||
|
#else /* __ASSEMBLER__ */
|
||||||
|
# include <tcb-offsets.h>
|
||||||
|
#endif /* __ASSEMBLER__ */
|
||||||
|
|
||||||
|
|
||||||
|
/* We require TLS support in the tools. */
|
||||||
|
#ifndef HAVE_TLS_SUPPORT
|
||||||
|
# error "TLS support is required."
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Signal that TLS support is available. */
|
||||||
|
# define USE_TLS 1
|
||||||
|
|
||||||
|
#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
|
||||||
|
|
||||||
|
/* Get the thread descriptor definition. */
|
||||||
|
# include <nptl/descr.h>
|
||||||
|
|
||||||
|
/* This layout is actually wholly private and not affected by the ABI.
|
||||||
|
Nor does it overlap the pthread data structure, so we need nothing
|
||||||
|
extra here at all. */
|
||||||
|
typedef struct
|
||||||
|
{
|
||||||
|
dtv_t *dtv;
|
||||||
|
} tcbhead_t;
|
||||||
|
|
||||||
|
/* 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)
|
||||||
|
|
||||||
|
/* This is the size of the TCB. */
|
||||||
|
# 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. */
|
||||||
|
# define TLS_PRE_TCB_SIZE \
|
||||||
|
(sizeof (struct pthread) \
|
||||||
|
+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 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. */
|
||||||
|
# define THREAD_SELF \
|
||||||
|
((struct pthread *) (__builtin_thread_pointer () \
|
||||||
|
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
|
||||||
|
|
||||||
|
/* Identifier for the current thread. THREAD_SELF is usable but
|
||||||
|
sometimes more expensive than necessary as in this case. */
|
||||||
|
# define THREAD_ID (__builtin_thread_pointer ())
|
||||||
|
|
||||||
|
/* Read member of the thread descriptor directly. */
|
||||||
|
# define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)
|
||||||
|
|
||||||
|
/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
|
||||||
|
# define THREAD_GETMEM_NC(descr, member, idx) \
|
||||||
|
((void)(descr), (THREAD_SELF)->member[idx])
|
||||||
|
|
||||||
|
/* Set member of the thread descriptor directly. */
|
||||||
|
# define THREAD_SETMEM(descr, member, value) \
|
||||||
|
((void)(descr), (THREAD_SELF)->member = (value))
|
||||||
|
|
||||||
|
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
|
||||||
|
# define THREAD_SETMEM_NC(descr, member, idx, value) \
|
||||||
|
((void)(descr), (THREAD_SELF)->member[idx] = (value))
|
||||||
|
|
||||||
|
/* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
|
||||||
|
different value to mean unset l_tls_offset. */
|
||||||
|
# define NO_TLS_OFFSET -1
|
||||||
|
|
||||||
|
#endif /* __ASSEMBLER__ */
|
||||||
|
|
||||||
|
#endif /* tls.h */
|
Loading…
Reference in New Issue
Block a user