/* Definition for thread-local data handling. NPTL/s390 version. Copyright (C) 2003-2013 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, see <http://www.gnu.org/licenses/>. */ #ifndef _TLS_H #define _TLS_H 1 #include <dl-sysdep.h> #ifndef __ASSEMBLER__ # include <stdbool.h> # include <stddef.h> # include <stdint.h> # include <stdlib.h> # include <list.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 { void *tcb; /* Pointer to the TCB. Not necessary the thread descriptor used by libpthread. */ dtv_t *dtv; void *self; /* Pointer to the thread descriptor. */ int multiple_threads; uintptr_t sysinfo; uintptr_t stack_guard; int gscope_flag; #ifndef __ASSUME_PRIVATE_FUTEX int private_futex; #endif } tcbhead_t; # ifndef __s390x__ # define TLS_MULTIPLE_THREADS_IN_TCB 1 # endif #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> #endif /* Alignment requirement for the stack. For IA-32 this is governed by the SSE memory functions. */ #define STACK_ALIGN 16 #ifndef __ASSEMBLER__ /* Get system call information. */ # include <sysdep.h> /* Get the thread descriptor definition. */ # include <nptl/descr.h> /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t), because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole struct pthread even when not linked with -lpthread. */ # define TLS_INIT_TCB_SIZE sizeof (struct pthread) /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) /* This is the size of the TCB. */ # define TLS_TCB_SIZE sizeof (struct pthread) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct pthread) /* The TCB can have any size and the memory following the address the thread pointer points to is unspecified. Allocate the TCB there. */ # define TLS_TCB_AT_TP 1 /* Install the dtv pointer. The pointer passed is to the element with index -1 which contain the length. */ # define INSTALL_DTV(descr, dtvp) \ ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 /* Install new dtv for current thread. */ # define INSTALL_NEW_DTV(dtv) \ (((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv)) /* Return dtv of given thread descriptor. */ # define GET_DTV(descr) \ (((tcbhead_t *) (descr))->dtv) #if defined NEED_DL_SYSINFO && defined SHARED # define INIT_SYSINFO \ _head->sysinfo = GLRO(dl_sysinfo) #else # define INIT_SYSINFO #endif /* 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(thrdescr, secondcall) \ ({ void *_thrdescr = (thrdescr); \ tcbhead_t *_head = _thrdescr; \ \ _head->tcb = _thrdescr; \ /* For now the thread descriptor is at the same address. */ \ _head->self = _thrdescr; \ /* New syscall handling support. */ \ INIT_SYSINFO; \ \ __builtin_set_thread_pointer (_thrdescr); \ NULL; \ }) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ (((tcbhead_t *) __builtin_thread_pointer ())->dtv) /* Return the thread descriptor for the current thread. */ # define THREAD_SELF ((struct pthread *) __builtin_thread_pointer ()) /* Magic for libthread_db to know how to do THREAD_SELF. */ # define DB_THREAD_SELF REGISTER (32, 32, 18 * 4, 0) \ REGISTER (64, __WORDSIZE, 18 * 8, 0) /* Access to data in the thread descriptor is easy. */ #define THREAD_GETMEM(descr, member) \ descr->member #define THREAD_GETMEM_NC(descr, member, idx) \ descr->member[idx] #define THREAD_SETMEM(descr, member, value) \ descr->member = (value) #define THREAD_SETMEM_NC(descr, member, idx, value) \ descr->member[idx] = (value) /* Set the stack guard field in TCB head. */ #define THREAD_SET_STACK_GUARD(value) \ do \ { \ __asm __volatile ("" : : : "a0", "a1"); \ THREAD_SETMEM (THREAD_SELF, header.stack_guard, value); \ } \ while (0) #define THREAD_COPY_STACK_GUARD(descr) \ ((descr)->header.stack_guard \ = THREAD_GETMEM (THREAD_SELF, header.stack_guard)) /* s390 doesn't have HP_TIMING_*, so for the time being use stack_guard as pointer_guard. */ #define THREAD_GET_POINTER_GUARD() \ THREAD_GETMEM (THREAD_SELF, header.stack_guard) #define THREAD_SET_POINTER_GUARD(value) #define THREAD_COPY_POINTER_GUARD(descr) /* 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 */