/* Copyright (C) 2011-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Chris Metcalf , 2011. 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 . */ #ifndef _TLS_H #define _TLS_H 1 # include #ifndef __ASSEMBLER__ # include # include # include /* Type for the dtv. */ typedef union dtv { size_t counter; struct { void *val; bool is_static; } pointer; } dtv_t; #else /* __ASSEMBLER__ */ # include #endif /* __ASSEMBLER__ */ #ifndef __ASSEMBLER__ /* Get system call information. */ # include /* The TP points to the start of the thread blocks. */ # define TLS_DTV_AT_TP 1 # define TLS_TCB_AT_TP 0 /* We use the multiple_threads field in the pthread struct */ #define TLS_MULTIPLE_THREADS_IN_TCB 1 /* Get the thread descriptor definition. */ # include /* The stack_guard is accessed directly by GCC -fstack-protector code, so it is a part of public ABI. The dtv and pointer_guard fields are private. */ typedef struct { void *feedback_data; uintptr_t pointer_guard; uintptr_t stack_guard; dtv_t *dtv; } tcbhead_t; /* This is the size of the initial TCB. Because our TCB is before the thread pointer, we don't need this. */ # define TLS_INIT_TCB_SIZE 0 /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) /* This is the size of the TCB. Because our TCB is before the thread pointer, we don't need this. */ # define TLS_TCB_SIZE 0 /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct pthread) /* This is the size we need before TCB - actually, it includes the TCB. */ # define TLS_PRE_TCB_SIZE \ (sizeof (struct pthread) \ + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) /* Return the thread descriptor (tp) for the current thread. */ register void *__thread_pointer asm ("tp"); /* The thread pointer (in hardware register tp) points to the end of the TCB. The pthread_descr structure is immediately in front of the TCB. */ # define TLS_TCB_OFFSET 0 /* 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))[-1].dtv = (dtvp) + 1) /* Install new dtv for current thread. */ # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv)) /* Return dtv of given thread descriptor. */ # define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv) /* Code to initially initialize the thread pointer (tp). */ # define TLS_INIT_TP(tcbp) \ (__thread_pointer = (char *)(tcbp) + TLS_TCB_OFFSET, NULL) /* Value passed to 'clone' for initialization of the thread register. */ # define TLS_DEFINE_INIT_TP(tp, pd) \ void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ (((tcbhead_t *) (__thread_pointer - TLS_TCB_OFFSET))[-1].dtv) /* Return the thread descriptor for the current thread. */ # define THREAD_SELF \ ((struct pthread *) (__thread_pointer \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) /* Magic for libthread_db to know how to do THREAD_SELF. */ #ifdef __tilegx__ # define DB_THREAD_SELF \ REGISTER (64, 64, REG_TP * 8, - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) #else # define DB_THREAD_SELF \ REGISTER (32, 32, REG_TP * 4, - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) #endif /* 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)) /* Set the stack guard field in TCB head. */ # define THREAD_SET_STACK_GUARD(value) \ (((tcbhead_t *) ((char *) __thread_pointer \ - TLS_TCB_OFFSET))[-1].stack_guard = (value)) # define THREAD_COPY_STACK_GUARD(descr) \ (((tcbhead_t *) ((char *) (descr) \ + TLS_PRE_TCB_SIZE))[-1].stack_guard \ = ((tcbhead_t *) ((char *) __thread_pointer \ - TLS_TCB_OFFSET))[-1].stack_guard) /* Set the pointer guard field in TCB head. */ # define THREAD_GET_POINTER_GUARD() \ (((tcbhead_t *) ((char *) __thread_pointer \ - TLS_TCB_OFFSET))[-1].pointer_guard) # define THREAD_SET_POINTER_GUARD(value) \ (THREAD_GET_POINTER_GUARD () = (value)) # define THREAD_COPY_POINTER_GUARD(descr) \ (((tcbhead_t *) ((char *) (descr) \ + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ = THREAD_GET_POINTER_GUARD()) /* l_tls_offset == 0 is perfectly valid on Tile, so we have to use some different value to mean unset l_tls_offset. */ # define NO_TLS_OFFSET -1 /* 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 */