| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 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 |
| <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> |
| |
| /* Type for the dtv. */ |
| typedef union dtv |
| { |
| size_t counter; |
| struct |
| { |
| void *val; |
| bool is_static; |
| } pointer; |
| } dtv_t; |
| |
| #else /* __ASSEMBLER__ */ |
| # include <tcb-offsets.h> |
| #endif /* __ASSEMBLER__ */ |
| |
| |
| #ifndef __ASSEMBLER__ |
| |
| /* Get system call information. */ |
| # include <sysdep.h> |
| |
| /* The TP points to the start of the thread blocks. */ |
| # define TLS_DTV_AT_TP 1 |
| |
| /* We use the multiple_threads field in the pthread struct */ |
| #define TLS_MULTIPLE_THREADS_IN_TCB 1 |
| |
| /* Get the thread descriptor definition. */ |
| # include <nptl/descr.h> |
| |
| /* 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, secondcall) \ |
| (__thread_pointer = (char *)(tcbp) + TLS_TCB_OFFSET, NULL) |
| |
| /* 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 */ |