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_unused[4]; 56 }; 57 58 struct tls_dtv { 59 uintptr_t dtv_generation; 60 uintptr_t dtv_max_index; 61 void *dtv_offset[__ARRAY_ZERO]; 62 }; 63 64 #define RTLD_TCB_HAS_SELF_POINTER 65 #define RTLD_STATIC_TLS_ALIGN 16 66 #define RTLD_STATIC_TLS_ALIGN_MASK (RTLD_STATIC_TLS_ALIGN - 1) 67 #define RTLD_STATIC_TLS_EXTRA 256 68 #define RTLD_STATIC_TLS_VARIANT_II 69 70 /* Get the current TCB. */ 71 static __inline struct tls_tcb * 72 tls_get_tcb(void) 73 { 74 void *self; 75 76 __asm __volatile ("movq %%fs:%1, %0" 77 : "=r" (self) 78 : "m" (((struct tls_tcb *)0)->tcb_self)); 79 80 return(self); 81 } 82 83 /* Get the current thread. */ 84 static __inline void * 85 tls_get_curthread(void) 86 { 87 void *self; 88 89 __asm __volatile ("movq %%fs:%1, %0" 90 : "=r" (self) 91 : "m" (((struct tls_tcb *)0)->tcb_pthread)); 92 93 return(self); 94 } 95 96 static __inline void 97 tls_set_tcb(struct tls_tcb *tcb) 98 { 99 struct tls_info info; 100 int seg; 101 102 info.base = tcb; 103 info.size = -1; 104 seg = set_tls_area(0, &info, sizeof(info)); 105 /*__asm __volatile("movl %0, %%fs" : : "r" (seg));*/ 106 } 107 108 static __inline void 109 tls_set_gs(void *base, size_t bytes) 110 { 111 struct tls_info info; 112 int seg; 113 114 info.base = base; 115 info.size = bytes; 116 seg = set_tls_area(1, &info, sizeof(info)); 117 /*__asm __volatile("mov %0, %%fs" : : "g" (seg));*/ 118 } 119 120 #ifndef _KERNEL 121 122 struct tls_tcb *_rtld_allocate_tls(void); 123 struct tls_tcb *_libc_allocate_tls(void); 124 void _rtld_free_tls(struct tls_tcb *); 125 void _libc_free_tls(struct tls_tcb *); 126 void _rtld_call_init(void); 127 struct tls_tcb *_libc_init_tls(void); 128 struct tls_tcb *_init_tls(void); 129 130 #endif 131 132 #endif /* !_CPU_TLS_H_ */ 133