TLS access definitions for Alpha.
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Ulrich Drepper
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/* Definition for thread-local data handling. NPTL/Alpha version.
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Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _TLS_H
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#define _TLS_H 1
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# include <dl-sysdep.h>
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#ifndef __ASSEMBLER__
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# include <stddef.h>
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# include <stdint.h>
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/* Type for the dtv. */
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typedef union dtv
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{
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size_t counter;
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void *pointer;
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} dtv_t;
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif /* __ASSEMBLER__ */
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/* We require TLS support in the tools. */
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#ifndef HAVE_TLS_SUPPORT
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# error "TLS support is required."
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#endif
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/* Signal that TLS support is available. */
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# define USE_TLS 1
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#ifndef __ASSEMBLER__
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/* Get system call information. */
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# include <sysdep.h>
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/* The TP points to the start of the thread blocks. */
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# define TLS_DTV_AT_TP 1
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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/* This layout is actually wholly private and not affected by the ABI.
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Nor does it overlap the pthread data structure, so we need nothing
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extra here at all. */
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typedef struct
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{
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dtv_t *dtv;
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} tcbhead_t;
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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE 0
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE 0
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (struct pthread)
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/* This is the size we need before TCB. */
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# define TLS_PRE_TCB_SIZE \
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(sizeof (struct pthread) \
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+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
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/* The following assumes that TP (R2 or R13) points to the end of the
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TCB + 0x7000 (per the ABI). This implies that TCB address is
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TP - 0x7000. As we define TLS_DTV_AT_TP we can
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assume that the pthread struct is allocated immediately ahead of the
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TCB. This implies that the pthread_descr address is
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TP - (TLS_PRE_TCB_SIZE + 0x7000). */
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/* ??? PPC uses offset 0x7000; seems like a good idea for alpha too,
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but binutils not yet changed to match. */
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# define TLS_TCB_OFFSET 0
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(tcbp, dtvp) \
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((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv)
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched. */
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# define TLS_INIT_TP(tcbp, secondcall) \
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(__builtin_set_thread_pointer ((void *) (tcbp) + TLS_TCB_OFFSET), NULL)
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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(((tcbhead_t *) (__builtin_thread_pointer () - TLS_TCB_OFFSET))[-1].dtv)
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/* Return the thread descriptor for the current thread. */
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# define THREAD_SELF \
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((struct pthread *) (__builtin_thread_pointer () \
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- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
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/* Identifier for the current thread. THREAD_SELF is usable but
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sometimes more expensive than necessary as in this case. */
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# define THREAD_ID (__builtin_thread_pointer ())
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/* Read member of the thread descriptor directly. */
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# define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)
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/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
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# define THREAD_GETMEM_NC(descr, member, idx) \
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((void)(descr), (THREAD_SELF)->member[idx])
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/* Set member of the thread descriptor directly. */
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# define THREAD_SETMEM(descr, member, value) \
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((void)(descr), (THREAD_SELF)->member = (value))
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/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
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# define THREAD_SETMEM_NC(descr, member, idx, value) \
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((void)(descr), (THREAD_SELF)->member[idx] = (value))
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/* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
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different value to mean unset l_tls_offset. */
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# define NO_TLS_OFFSET -1
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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