1 /* 2 * Copyright (C) 2017 Hangzhou C-SKY Microsystems co.,ltd. 3 * 4 * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB 5 * in this tarball. 6 */ 7 8 #ifndef _TLS_H 9 #define _TLS_H 1 10 11 #ifndef __ASSEMBLER__ 12 13 # include <stdbool.h> 14 # include <stddef.h> 15 # include <stdint.h> 16 17 /* Type for the dtv. */ 18 typedef union dtv 19 { 20 size_t counter; 21 struct 22 { 23 void *val; 24 bool is_static; 25 } pointer; 26 } dtv_t; 27 28 #ifdef __CSKYABIV2__ 29 /* define r31 as thread pointer register? */ 30 # define READ_THREAD_POINTER() \ 31 ({ void *__result; \ 32 __asm__ __volatile__ ("mov %0, r31" \ 33 : "=r" (__result)); \ 34 __result; }) 35 #else 36 # define READ_THREAD_POINTER() \ 37 ({ register unsigned int __result __asm__("a0"); \ 38 __asm__ __volatile__ ("trap 3;" \ 39 : "=r" (__result) : : ); \ 40 __result; }) 41 #endif 42 43 #else /* __ASSEMBLER__ */ 44 # include <tcb-offsets.h> 45 # ifdef __CSKYABIV2__ 46 /* define r31 as thread pointer register? */ 47 # define READ_THREAD_POINTER() \ 48 mov r0, r31; 49 # else 50 # define READ_THREAD_POINTER() \ 51 trap 3; 52 # endif 53 #endif /* __ASSEMBLER__ */ 54 55 /* We require TLS support in the tools. */ 56 #define HAVE_TLS_SUPPORT 1 57 #define HAVE_TLS_MODEL_ATTRIBUTE 1 58 #define HAVE___THREAD 1 59 60 /* Signal that TLS support is available. */ 61 #define USE_TLS 1 62 63 # ifndef __ASSEMBLER__ 64 65 /* Get system call information. */ 66 # include <sysdep.h> 67 68 /* The TP points to the start of the thread blocks. */ 69 # define TLS_DTV_AT_TP 1 70 71 /* Get the thread descriptor definition. */ 72 # include <../../descr.h> 73 74 typedef struct 75 { 76 dtv_t *dtv; 77 void *private; 78 } tcbhead_t; 79 80 /* This is the size of the initial TCB. */ 81 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 82 83 /* Alignment requirements for the initial TCB. */ 84 # define TLS_INIT_TCB_ALIGN 16 85 86 /* This is the size of the TCB. */ 87 # define TLS_TCB_SIZE sizeof (tcbhead_t) 88 89 /* Alignment requirements for the TCB. */ 90 # define TLS_TCB_ALIGN 16 91 92 /* This is the size we need before TCB. */ 93 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 94 95 /* The thread pointer (in hardware register $29) points to the end of 96 the TCB + 0x7000, as for PowerPC. The pthread_descr structure is 97 immediately in front of the TCB. */ 98 # define TLS_TCB_OFFSET 0//0x7000 99 100 /* Install the dtv pointer. The pointer passed is to the element with 101 index -1 which contain the length. */ 102 # define INSTALL_DTV(tcbp, dtvp) \ 103 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) 104 105 /* Install new dtv for current thread. */ 106 # define INSTALL_NEW_DTV(dtv) \ 107 (THREAD_DTV() = (dtv)) 108 109 /* Return dtv of given thread descriptor. */ 110 # define GET_DTV(tcbp) \ 111 (((tcbhead_t *) (tcbp))->dtv) 112 113 /* Code to initially initialize the thread pointer. This might need 114 special attention since 'errno' is not yet available and if the 115 operation can cause a failure 'errno' must not be touched. */ 116 # define TLS_INIT_TP(tcbp, secondcall) \ 117 ({ INTERNAL_SYSCALL_DECL (err); \ 118 long result_var; \ 119 result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \ 120 (char *) (tcbp) + TLS_TCB_OFFSET); \ 121 INTERNAL_SYSCALL_ERROR_P (result_var, err) \ 122 ? "unknown error" : NULL; }) 123 124 /* Return the address of the dtv for the current thread. */ 125 # define THREAD_DTV() \ 126 (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))->dtv) 127 128 /* Return the thread descriptor for the current thread. */ 129 # undef THREAD_SELF 130 # define THREAD_SELF \ 131 ((struct pthread *) (READ_THREAD_POINTER () \ 132 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) 133 134 /* Magic for libthread_db to know how to do THREAD_SELF. */ 135 # define DB_THREAD_SELF \ 136 CONST_THREAD_AREA (32, sizeof (struct pthread)) 137 138 /* Access to data in the thread descriptor is easy. */ 139 #define THREAD_GETMEM(descr, member) \ 140 descr->member 141 #define THREAD_GETMEM_NC(descr, member, idx) \ 142 descr->member[idx] 143 #define THREAD_SETMEM(descr, member, value) \ 144 descr->member = (value) 145 #define THREAD_SETMEM_NC(descr, member, idx, value) \ 146 descr->member[idx] = (value) 147 148 /* Initializing the thread pointer will generate a SIGILL if the syscall 149 is not available. */ 150 #define TLS_INIT_TP_EXPENSIVE 1 151 152 /* Get and set the global scope generation counter in struct pthread. */ 153 #define THREAD_GSCOPE_FLAG_UNUSED 0 154 #define THREAD_GSCOPE_FLAG_USED 1 155 #define THREAD_GSCOPE_FLAG_WAIT 2 156 #define THREAD_GSCOPE_RESET_FLAG() \ 157 do \ 158 { int __res \ 159 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 160 THREAD_GSCOPE_FLAG_UNUSED); \ 161 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 162 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 163 } \ 164 while (0) 165 #define THREAD_GSCOPE_SET_FLAG() \ 166 do \ 167 { \ 168 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 169 atomic_write_barrier (); \ 170 } \ 171 while (0) 172 #define THREAD_GSCOPE_WAIT() \ 173 GL(dl_wait_lookup_done) () 174 175 #endif /* __ASSEMBLER__ */ 176 177 #endif /* tls.h */ 178