1 /* Definition for thread-local data handling. NPTL/m68k version. 2 Copyright (C) 2010-2017 Free Software Foundation, Inc. 3 Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _TLS_H 20 #define _TLS_H 1 21 22 #ifndef __ASSEMBLER__ 23 # include <stdbool.h> 24 # include <stddef.h> 25 # include <stdint.h> 26 27 /* Type for the dtv. */ 28 typedef union dtv 29 { 30 size_t counter; 31 struct 32 { 33 void *val; 34 bool is_static; 35 } pointer; 36 } dtv_t; 37 38 /* Value used for dtv entries for which the allocation is delayed. */ 39 #define TLS_DTV_UNALLOCATED ((void *) -1l) 40 41 #else /* __ASSEMBLER__ */ 42 # include <tcb-offsets.h> 43 #endif /* __ASSEMBLER__ */ 44 45 /* We require TLS support in the tools. */ 46 #define HAVE_TLS_SUPPORT 1 47 #define HAVE_TLS_MODEL_ATTRIBUTE 1 48 #define HAVE___THREAD 1 49 50 /* Signal that TLS support is available. */ 51 #define USE_TLS 1 52 53 #ifndef __ASSEMBLER__ 54 55 /* Get system call information. */ 56 # include <sysdep.h> 57 58 /* The TP points to the start of the thread blocks. */ 59 # define TLS_DTV_AT_TP 1 60 61 /* Get the thread descriptor definition. */ 62 # include <../../descr.h> 63 64 typedef struct 65 { 66 dtv_t *dtv; 67 void *private; 68 } tcbhead_t; 69 70 /* This is the size of the initial TCB. Because our TCB is before the thread 71 pointer, we don't need this. */ 72 # define TLS_INIT_TCB_SIZE 0 73 74 /* Alignment requirements for the initial TCB. */ 75 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) 76 77 /* This is the size of the TCB. Because our TCB is before the thread 78 pointer, we don't need this. */ 79 # define TLS_TCB_SIZE 0 80 81 /* Alignment requirements for the TCB. */ 82 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 83 84 /* This is the size we need before TCB - actually, it includes the TCB. */ 85 # define TLS_PRE_TCB_SIZE \ 86 (sizeof (struct pthread) \ 87 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) 88 89 /* The thread pointer (TP) points to the end of the 90 TCB + 0x7000, as for PowerPC and MIPS. This implies that TCB address is 91 TP - 0x7000. As we define TLS_DTV_AT_TP we can 92 assume that the pthread struct is allocated immediately ahead of the 93 TCB. This implies that the pthread_descr address is 94 TP - (TLS_PRE_TCB_SIZE + 0x7000). */ 95 # define TLS_TCB_OFFSET 0x7000 96 97 /* Install the dtv pointer. The pointer passed is to the element with 98 index -1 which contain the length. */ 99 # define INSTALL_DTV(tcbp, dtvp) \ 100 ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1 101 102 /* Install new dtv for current thread. */ 103 # define INSTALL_NEW_DTV(dtv) \ 104 (THREAD_DTV () = (dtv)) 105 106 /* Return dtv of given thread descriptor. */ 107 # define GET_DTV(tcbp) \ 108 (((tcbhead_t *) (tcbp))[-1].dtv) 109 110 /* Code to initially initialize the thread pointer. This might need 111 special attention since 'errno' is not yet available and if the 112 operation can cause a failure 'errno' must not be touched. */ 113 # define TLS_INIT_TP(tcbp, secondcall) \ 114 ({ \ 115 INTERNAL_SYSCALL_DECL (err); \ 116 int result_var; \ 117 result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \ 118 ((void *) (tcbp)) + TLS_TCB_OFFSET); \ 119 INTERNAL_SYSCALL_ERROR_P (result_var, err) \ 120 ? "unknown error" : NULL; }) 121 122 # define TLS_DEFINE_INIT_TP(tp, pd) \ 123 void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE 124 125 extern void * __m68k_read_tp (void); 126 127 /* Return the address of the dtv for the current thread. */ 128 # define THREAD_DTV() \ 129 (((tcbhead_t *) (__m68k_read_tp () - TLS_TCB_OFFSET))[-1].dtv) 130 131 /* Return the thread descriptor for the current thread. */ 132 # define THREAD_SELF \ 133 ((struct pthread *) (__m68k_read_tp () - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) 134 135 /* Magic for libthread_db to know how to do THREAD_SELF. */ 136 # define DB_THREAD_SELF \ 137 CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE) 138 139 /* Access to data in the thread descriptor is easy. */ 140 # define THREAD_GETMEM(descr, member) \ 141 descr->member 142 # define THREAD_GETMEM_NC(descr, member, idx) \ 143 descr->member[idx] 144 # define THREAD_SETMEM(descr, member, value) \ 145 descr->member = (value) 146 # define THREAD_SETMEM_NC(descr, member, idx, value) \ 147 descr->member[idx] = (value) 148 149 /* l_tls_offset == 0 is perfectly valid on M68K, so we have to use some 150 different value to mean unset l_tls_offset. */ 151 # define NO_TLS_OFFSET -1 152 153 /* Get and set the global scope generation counter in struct pthread. */ 154 #define THREAD_GSCOPE_FLAG_UNUSED 0 155 #define THREAD_GSCOPE_FLAG_USED 1 156 #define THREAD_GSCOPE_FLAG_WAIT 2 157 #define THREAD_GSCOPE_RESET_FLAG() \ 158 do \ 159 { int __res \ 160 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 161 THREAD_GSCOPE_FLAG_UNUSED); \ 162 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 163 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 164 } \ 165 while (0) 166 #define THREAD_GSCOPE_SET_FLAG() \ 167 do \ 168 { \ 169 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 170 atomic_write_barrier (); \ 171 } \ 172 while (0) 173 #define THREAD_GSCOPE_WAIT() \ 174 GL(dl_wait_lookup_done) () 175 176 #endif /* __ASSEMBLER__ */ 177 178 #endif /* tls.h */ 179