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9ce0ecbe38
2004-03-24 Jakub Jelinek <jakub@redhat.com> * stdlib/strtod_l.c (INTERNAL (__STRTOF)): Clear the rest of retval, not just one limb if RETURN_LIMB_SIZE > 2. Fix shifting up if RETURN_LIMB_SIZE > 2. * stdio-common/printf_fp.c (__printf_fp): For IEEE quad long double on 32-bit architectures reserve 8 limbs instead of 4.
156 lines
5.1 KiB
C
156 lines
5.1 KiB
C
/* Definitions for thread-local data handling. linuxthreads/PPC 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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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif /* __ASSEMBLER__ */
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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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/* 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_descr_struct)
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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_descr_struct)
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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_descr_struct) \
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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) is 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_descr 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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#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))[-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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/* The global register variable is declared in pt-machine.h with
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the wrong type, but the compiler doesn't like us declaring another. */
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# define __thread_register ((void *) __thread_self)
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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_register = (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 *) (__thread_register - TLS_TCB_OFFSET))[-1].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_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_register = ((void *) (DESCR) \
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+ TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE))
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/* Make sure we have the p_multiple_threads member in the thread structure.
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See below. */
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# define TLS_MULTIPLE_THREADS_IN_TCB 1
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/* Get the thread descriptor definition. */
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# include <linuxthreads/descr.h>
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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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#elif !defined __ASSEMBLER__
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/* This overlaps the start of the pthread_descr. System calls
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and such use this to find the multiple_threads flag and need
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to use the same offset relative to the thread register in both
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single-threaded and multi-threaded code. */
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typedef struct
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{
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void *tcb; /* Never used. */
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dtv_t *dtv; /* Never used. */
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void *self; /* Used only if multithreaded, and rarely. */
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int multiple_threads; /* Only this member is really used. */
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} tcbhead_t;
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#define NONTLS_INIT_TP \
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do { \
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static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 }; \
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__thread_self = (__typeof (__thread_self)) &nontls_init_tp; \
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} while (0)
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#endif /* HAVE_TLS_SUPPORT */
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#endif /* tls.h */
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