| /* 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 |
| |
| # include <dl-sysdep.h> |
| |
| #ifndef __ASSEMBLER__ |
| # include <stdbool.h> |
| # include <stddef.h> |
| # include <stdint.h> |
| # include <stdlib.h> |
| # include <list.h> |
| # include <sysdep.h> |
| # include <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. */ |
| #ifndef HAVE_TLS_SUPPORT |
| # error "TLS support is required." |
| #endif |
| |
| #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 <nptl/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 */ |