/* Definition for thread-local data handling. NPTL/SH version. Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _TLS_H #define _TLS_H #ifndef __ASSEMBLER__ # include <stdbool.h> # include <stddef.h> # include <stdint.h> # include <stdlib.h> # include <list.h> # include <sysdep.h> # include <bits/kernel-features.h> /* Type for the dtv. */ typedef union dtv { size_t counter; struct { void *val; bool is_static; } pointer; } dtv_t; typedef struct { dtv_t *dtv; uintptr_t pointer_guard; } tcbhead_t; # define TLS_MULTIPLE_THREADS_IN_TCB 1 #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> #endif /* __ASSEMBLER__ */ /* We require TLS support in the tools. */ #define HAVE_TLS_SUPPORT #define HAVE___THREAD 1 #define HAVE_TLS_MODEL_ATTRIBUTE 1 /* Signal that TLS support is available. */ # define USE_TLS 1 #ifndef __ASSEMBLER__ /* Get system call information. */ # include <sysdep.h> /* This is the size of the initial TCB. */ # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) /* This is the size of the TCB. */ # define TLS_TCB_SIZE sizeof (tcbhead_t) /* This is the size we need before TCB. */ # define TLS_PRE_TCB_SIZE sizeof (struct pthread) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct pthread) /* The TLS blocks start right after the TCB. */ # define TLS_DTV_AT_TP 1 /* Get the thread descriptor definition. */ # include <descr.h> /* Install the dtv pointer. The pointer passed is to the element with index -1 which contain the length. */ # define INSTALL_DTV(tcbp, dtvp) \ ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1 /* Install new dtv for current thread. */ # define INSTALL_NEW_DTV(dtv) \ ({ tcbhead_t *__tcbp; \ __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ __tcbp->dtv = (dtv);}) /* Return dtv of given thread descriptor. */ # define GET_DTV(tcbp) \ (((tcbhead_t *) (tcbp))->dtv) /* Code to initially initialize the thread pointer. This might need special attention since 'errno' is not yet available and if the operation can cause a failure 'errno' must not be touched. */ # define TLS_INIT_TP(tcbp, secondcall) \ ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; }) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ ({ tcbhead_t *__tcbp; \ __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ __tcbp->dtv;}) /* Return the thread descriptor for the current thread. The contained asm must *not* be marked volatile since otherwise assignments like struct pthread *self = thread_self(); do not get optimized away. */ # define THREAD_SELF \ ({ struct pthread *__self; \ __asm ("stc gbr,%0" : "=r" (__self)); \ __self - 1;}) /* Magic for libthread_db to know how to do THREAD_SELF. */ # define DB_THREAD_SELF \ REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread)) /* Read member of the thread descriptor directly. */ # define THREAD_GETMEM(descr, member) (descr->member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ # define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx]) /* Set member of the thread descriptor directly. */ # define THREAD_SETMEM(descr, member, value) \ descr->member = (value) /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ # define THREAD_SETMEM_NC(descr, member, idx, value) \ descr->member[idx] = (value) #define THREAD_GET_POINTER_GUARD() \ ({ tcbhead_t *__tcbp; \ __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ __tcbp->pointer_guard;}) #define THREAD_SET_POINTER_GUARD(value) \ ({ tcbhead_t *__tcbp; \ __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ __tcbp->pointer_guard = (value);}) #define THREAD_COPY_POINTER_GUARD(descr) \ ({ tcbhead_t *__tcbp; \ __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ ((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;}) /* Get and set the global scope generation counter in struct pthread. */ #define THREAD_GSCOPE_FLAG_UNUSED 0 #define THREAD_GSCOPE_FLAG_USED 1 #define THREAD_GSCOPE_FLAG_WAIT 2 #define THREAD_GSCOPE_RESET_FLAG() \ do \ { int __res \ = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ THREAD_GSCOPE_FLAG_UNUSED); \ if (__res == THREAD_GSCOPE_FLAG_WAIT) \ lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ } \ while (0) #define THREAD_GSCOPE_SET_FLAG() \ do \ { \ THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ atomic_write_barrier (); \ } \ while (0) #define THREAD_GSCOPE_WAIT() \ GL(dl_wait_lookup_done) () #endif /* __ASSEMBLER__ */ #endif /* tls.h */