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/* Definitions for thread-local data handling. linuxthreads/PowerPC64 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
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#ifndef __ASSEMBLER__
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# include <pt-machine.h>
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# include <stddef.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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typedef struct
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{
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dtv_t *dtv;
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/* Reserved for the thread implementation. Unused in LinuxThreads. */
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void *private;
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} tcbhead_t;
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#endif
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#ifdef HAVE_TLS_SUPPORT
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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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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (tcbhead_t)
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (tcbhead_t)
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/* This is the size we need before TCB. */
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# define TLS_PRE_TCB_SIZE sizeof (struct _pthread_descr_struct)
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/* the following assumes that TP (R13) is points to the end of the tcb
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+ 0x7000 (per the ABI). This implies that tcb address is
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R13-(TLS_TCB_SIZE + 0x7000). As we define TLS_DTV_AT_TP we can
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assume that the pthread_descr is allocate immediately ahead of the
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tcb. This implies that the pthread_descr address is
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R13-(TLS_PRE_TCB_SIZE + TLS_TCB_SIZE + 0x7000). */
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# define TLS_TCB_OFFSET 0x7000
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/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
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/* This is not really true for powerpc64. We are following alpha
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where the DTV pointer is first doubleword in the TCB. */
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# define TLS_DTV_AT_TP 1
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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))->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))->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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(__thread_self = (uintptr_t) (TCBP) + TLS_TCB_OFFSET + TLS_TCB_SIZE, 0)
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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 *) (__thread_register - (TLS_TCB_OFFSET + TLS_TCB_SIZE)))->dtv)
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/* Return the thread descriptor for the current thread. */
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# undef THREAD_SELF
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# define THREAD_SELF \
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((pthread_descr) (__thread_register \
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- (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))
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# undef INIT_THREAD_SELF
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# define INIT_THREAD_SELF(DESCR, NR) \
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(__thread_self = (pthread_descr) (((char *)(DESCR)) \
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+ (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))
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/* Get the thread descriptor definition. */
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# include <linuxthreads/descr.h>
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/* Generic bits of LinuxThreads may call these macros with
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DESCR set to NULL. We are expected to be able to reference
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the "current" value. */
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#define THREAD_GETMEM(descr, member) \
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((void) sizeof (descr), THREAD_SELF->member)
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#define THREAD_GETMEM_NC(descr, member) \
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((void) sizeof (descr), THREAD_SELF->member)
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#define THREAD_SETMEM(descr, member, value) \
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((void) sizeof (descr), THREAD_SELF->member = (value))
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#define THREAD_SETMEM_NC(descr, member, value) \
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((void) sizeof (descr), THREAD_SELF->member = (value))
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# endif /* HAVE_TLS_SUPPORT */
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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Roland McGrath