177 lines
5.7 KiB
C
177 lines
5.7 KiB
C
/* Definition for thread-local data handling. NPTL/s390 version.
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Copyright (C) 2003-2022 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 <stdlib.h>
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# include <list.h>
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# include <kernel-features.h>
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# include <dl-dtv.h>
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typedef struct
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{
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void *tcb; /* Pointer to the TCB. Not necessary the
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thread descriptor used by libpthread. */
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dtv_t *dtv;
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void *self; /* Pointer to the thread descriptor. */
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int multiple_threads;
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uintptr_t sysinfo;
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uintptr_t stack_guard;
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int gscope_flag;
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int __glibc_reserved1;
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/* GCC split stack support. */
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void *__private_ss;
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} tcbhead_t;
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# ifndef __s390x__
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# define TLS_MULTIPLE_THREADS_IN_TCB 1
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# endif
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif
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/* Alignment requirement for the stack. For IA-32 this is governed by
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the SSE memory functions. */
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#define STACK_ALIGN 16
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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. Can't be just sizeof (tcbhead_t),
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because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
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struct pthread even when not linked with -lpthread. */
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# define TLS_INIT_TCB_SIZE sizeof (struct pthread)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (struct pthread)
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/* The TCB can have any size and the memory following the address the
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thread pointer points to is unspecified. Allocate the TCB there. */
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# define TLS_TCB_AT_TP 1
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# define TLS_DTV_AT_TP 0
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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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(descr, dtvp) \
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((tcbhead_t *) (descr))->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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(((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(descr) \
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(((tcbhead_t *) (descr))->dtv)
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#if defined NEED_DL_SYSINFO && defined SHARED
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# define INIT_SYSINFO \
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_head->sysinfo = GLRO(dl_sysinfo)
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#else
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# define INIT_SYSINFO
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#endif
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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(thrdescr) \
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({ void *_thrdescr = (thrdescr); \
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tcbhead_t *_head = _thrdescr; \
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\
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_head->tcb = _thrdescr; \
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/* For now the thread descriptor is at the same address. */ \
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_head->self = _thrdescr; \
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/* New syscall handling support. */ \
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INIT_SYSINFO; \
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\
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__builtin_set_thread_pointer (_thrdescr); \
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NULL; \
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})
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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) void *tp = (pd)
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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 ())->dtv)
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/* Return the thread descriptor for the current thread. */
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# define THREAD_SELF ((struct pthread *) __builtin_thread_pointer ())
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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF REGISTER (32, 32, 18 * 4, 0) \
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REGISTER (64, __WORDSIZE, 18 * 8, 0)
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# include <tcb-access.h>
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/* Set the stack guard field in TCB head. */
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#define THREAD_SET_STACK_GUARD(value) \
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do \
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{ \
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__asm__ __volatile__ ("" : : : "a0", "a1"); \
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THREAD_SETMEM (THREAD_SELF, header.stack_guard, value); \
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} \
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while (0)
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#define THREAD_COPY_STACK_GUARD(descr) \
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((descr)->header.stack_guard \
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= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
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/* s390 doesn't have HP_TIMING_*, so for the time being
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use stack_guard as pointer_guard. */
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#define THREAD_GET_POINTER_GUARD() \
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THREAD_GETMEM (THREAD_SELF, header.stack_guard)
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#define THREAD_SET_POINTER_GUARD(value) ((void) (value))
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#define THREAD_COPY_POINTER_GUARD(descr)
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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_rel (&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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