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1f34a23288
This makes it more likely that the compiler can compute the strlen argument in _startup_fatal at compile time, which is required to avoid a dependency on strlen this early during process startup. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
150 lines
4.8 KiB
C
150 lines
4.8 KiB
C
/* Definition for thread-local data handling. NPTL/Nios II version.
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Copyright (C) 2012-2022 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, see
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<https://www.gnu.org/licenses/>. */
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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 <stdbool.h>
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# include <stddef.h>
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# include <stdint.h>
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# include <dl-dtv.h>
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif /* __ASSEMBLER__ */
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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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# define TLS_TCB_AT_TP 0
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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typedef struct
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{
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dtv_t *dtv;
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uintptr_t pointer_guard;
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unsigned spare[6];
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} tcbhead_t;
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register struct pthread *__thread_self __asm__("r23");
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#define READ_THREAD_POINTER() ((void *) __thread_self)
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/* This is the size of the initial TCB. Because our TCB is before the thread
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pointer, we don't need this. */
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# define TLS_INIT_TCB_SIZE 0
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/* This is the size of the TCB. Because our TCB is before the thread
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pointer, we don't need this. */
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# define TLS_TCB_SIZE 0
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/* This is the size we need before TCB - actually, it includes the TCB. */
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# define TLS_PRE_TCB_SIZE \
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(sizeof (struct pthread) \
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+ ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \
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& ~(__alignof (struct pthread) - 1)))
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/* The thread pointer (in hardware register r23) points to the end of
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the TCB + 0x7000, as for PowerPC and MIPS. */
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# define TLS_TCB_OFFSET 0x7000
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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) \
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(THREAD_DTV() = (dtv))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(tcbp) \
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(((tcbhead_t *) (tcbp))[-1].dtv)
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/* Code to initially initialize the thread pointer. */
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# define TLS_INIT_TP(tcbp) \
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(__thread_self = (struct pthread *) ((char *) tcbp + TLS_TCB_OFFSET), true)
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/* Value passed to 'clone' for initialization of the thread register. */
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# define TLS_DEFINE_INIT_TP(tp, pd) \
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void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE
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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 *) (READ_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 *) (READ_THREAD_POINTER () \
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- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF \
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REGISTER (32, 32, 23 * 4, -TLS_PRE_TCB_SIZE - TLS_TCB_OFFSET)
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# include <tcb-access.h>
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# define THREAD_GET_POINTER_GUARD() \
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(((tcbhead_t *) (READ_THREAD_POINTER () \
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- TLS_TCB_OFFSET))[-1].pointer_guard)
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# define THREAD_SET_POINTER_GUARD(value) \
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(THREAD_GET_POINTER_GUARD () = (value))
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# define THREAD_COPY_POINTER_GUARD(descr) \
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(((tcbhead_t *) ((void *) (descr) \
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+ TLS_PRE_TCB_SIZE))[-1].pointer_guard \
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= THREAD_GET_POINTER_GUARD())
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/* l_tls_offset == 0 is perfectly valid on Nios II, 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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/* Get and set the global scope generation counter in struct pthread. */
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#define THREAD_GSCOPE_FLAG_UNUSED 0
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#define THREAD_GSCOPE_FLAG_USED 1
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#define THREAD_GSCOPE_FLAG_WAIT 2
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#define THREAD_GSCOPE_RESET_FLAG() \
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do \
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{ int __res \
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= atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \
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THREAD_GSCOPE_FLAG_UNUSED); \
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if (__res == THREAD_GSCOPE_FLAG_WAIT) \
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lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
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} \
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while (0)
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#define THREAD_GSCOPE_SET_FLAG() \
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do \
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{ \
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THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
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atomic_write_barrier (); \
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} \
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while (0)
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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