| /* Definition for thread-local data handling. NPTL/s390 version. |
| Copyright (C) 2003-2018 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> |
| # include <dl-dtv.h> |
| |
| 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; |
| #else |
| int __glibc_reserved1; |
| #endif |
| /* GCC split stack support. */ |
| void *__private_ss; |
| } 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> |
| |
| /* 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 |
| # define TLS_DTV_AT_TP 0 |
| |
| /* 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(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) \ |
| ({ 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; \ |
| }) |
| |
| /* Value passed to 'clone' for initialization of the thread register. */ |
| # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) |
| |
| /* 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) ((void) (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 */ |