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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | /* * This file is subject to the terms and conditions of the LGPL V2.1 * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2019 Kalray Inc. */ #ifndef _TLS_H #define _TLS_H 1 #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__ */ /* We require TLS support in the tools. */ #define HAVE_TLS_SUPPORT 1 #define HAVE_TLS_MODEL_ATTRIBUTE 1 #define HAVE___THREAD 1 /* Signal that TLS support is available. */ #define USE_TLS 1 #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 /* Get the thread descriptor definition. */ # include <../../descr.h> typedef struct { dtv_t *dtv; } tcbhead_t; /* Thread Pointer $tp is $r13 */ register tcbhead_t *__thread_self __asm__("$r13"); /* This is the size of the initial TCB. */ # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) /* This is the size of the TCB. */ # define TLS_TCB_SIZE sizeof (tcbhead_t) /* This is the size we need before TCB. */ # define TLS_PRE_TCB_SIZE sizeof (struct pthread) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (tcbhead_t) /* 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))->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))->dtv) /* Code to initially initialize the thread pointer. * * Set TP to the address _after_ tcbhead_t. This will allow us * to change the size of tcbhead_t without having to re-link everything. * * secondcall has something to do with USE__THREAD, * seems to always be 0 so we don't care about it. * * This has to return NULL on success (or a string with the failure text). * It's hard to fail this, so return NULL always. */ # define TLS_INIT_TP(tcbp, secondcall) \ ({__thread_self = ((tcbhead_t *)tcbp + 1); NULL;}) /* Return the address of the dtv for the current thread. * * Dereference TP, offset to dtv - really straightforward. * Remember that we made TP point to after tcb, so we need to reverse that. */ # define THREAD_DTV() \ ((((tcbhead_t *)__thread_self)-1)->dtv) /* Return the thread descriptor for the current thread. * * Return a pointer to the TLS_PRE area where we allocated space for * a struct pthread. Again, TP points to after tcbhead_t, compensate with * TLS_INIT_TCB_SIZE. * * I regard this is a seperate system from the "normal" TLS. */ # define THREAD_SELF \ ((struct pthread *) ((char *) __thread_self - TLS_INIT_TCB_SIZE \ - TLS_PRE_TCB_SIZE)) /* Magic for libthread_db to know how to do THREAD_SELF. */ # define DB_THREAD_SELF \ CONST_THREAD_AREA (64, sizeof (struct pthread)) /* 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) /* 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 */ |