1 /* 2 * Copyright (c) 2005,2008 The DragonFly Project. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 3. Neither the name of The DragonFly Project nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific, prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef _CPU_TLS_H_ 33 #define _CPU_TLS_H_ 34 35 #ifndef _SYS_TYPES_H_ 36 #include <sys/types.h> 37 #endif 38 #ifndef _SYS_TLS_H_ 39 #include <sys/tls.h> 40 #endif 41 42 /* 43 * NOTE: the tcb_{self,dtv,pthread,errno) fields must be declared 44 * in the structure in the specified order as assembly will access the 45 * fields with a hardwired offset. 46 * 47 * Outside of this file, the system call layer generation will hardwire 48 * the offset for tcb_errno. 49 */ 50 struct tls_tcb { 51 struct tls_tcb *tcb_self; /* pointer to self*/ 52 void *tcb_dtv; /* Dynamic Thread Vector */ 53 void *tcb_pthread; /* thread library's data*/ 54 int *tcb_errno_p; /* pointer to per-thread errno */ 55 void *tcb_segstack; /* used for segmented stacks */ 56 /* e.g. by LLVM to store stack bound */ 57 /* NOTE: do not reorder this field */ 58 /* as LLVM uses a fixed offset (32) */ 59 void *tcb_unused[3]; 60 }; 61 62 struct tls_dtv { 63 uintptr_t dtv_generation; 64 uintptr_t dtv_max_index; 65 void *dtv_offset[__ARRAY_ZERO]; 66 }; 67 68 #define RTLD_TCB_HAS_SELF_POINTER 69 #define RTLD_STATIC_TLS_ALIGN 16 70 #define RTLD_STATIC_TLS_ALIGN_MASK (RTLD_STATIC_TLS_ALIGN - 1) 71 #define RTLD_STATIC_TLS_EXTRA 1280 72 #define RTLD_STATIC_TLS_VARIANT_II 73 74 /* Get the current TCB. */ 75 static __inline struct tls_tcb * 76 tls_get_tcb(void) 77 { 78 void *self; 79 80 __asm __volatile ("movq %%fs:%1, %0" 81 : "=r" (self) 82 : "m" (((struct tls_tcb *)0)->tcb_self)); 83 84 return(self); 85 } 86 87 /* Get the current thread. */ 88 static __inline void * 89 tls_get_curthread(void) 90 { 91 void *self; 92 93 __asm __volatile ("movq %%fs:%1, %0" 94 : "=r" (self) 95 : "m" (((struct tls_tcb *)0)->tcb_pthread)); 96 97 return(self); 98 } 99 100 static __inline void 101 tls_set_tcb(struct tls_tcb *tcb) 102 { 103 struct tls_info info; 104 int seg; 105 106 info.base = tcb; 107 info.size = -1; 108 seg = set_tls_area(0, &info, sizeof(info)); 109 /*__asm __volatile("movl %0, %%fs" : : "r" (seg));*/ 110 } 111 112 static __inline void 113 tls_set_gs(void *base, size_t bytes) 114 { 115 struct tls_info info; 116 int seg; 117 118 info.base = base; 119 info.size = bytes; 120 seg = set_tls_area(1, &info, sizeof(info)); 121 /*__asm __volatile("mov %0, %%fs" : : "g" (seg));*/ 122 } 123 124 #ifndef _KERNEL 125 126 struct tls_tcb *_rtld_allocate_tls(void); 127 struct tls_tcb *_libc_allocate_tls(void); 128 void _rtld_free_tls(struct tls_tcb *); 129 void _libc_free_tls(struct tls_tcb *); 130 void _rtld_call_init(void); 131 struct tls_tcb *_libc_init_tls(void); 132 struct tls_tcb *_init_tls(void); 133 134 #endif 135 136 #endif /* !_CPU_TLS_H_ */ 137