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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 | /* Definition for thread-local data handling. nptl/x86_64 version.
Copyright (C) 2002-2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _TLS_H
#define _TLS_H 1
#ifndef __ASSEMBLER__
# include <asm/prctl.h> /* For ARCH_SET_FS. */
# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
# include <stdlib.h>
# include <sysdep.h>
# include <bits/kernel-features.h>
# include <bits/wordsize.h>
# include <xmmintrin.h>
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
struct
{
void *val;
bool is_static;
} pointer;
} dtv_t;
typedef struct
{
void *tcb; /* Pointer to the TCB. Not necessarily the
thread descriptor used by libpthread. */
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
int gscope_flag;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
unsigned long int vgetcpu_cache[2];
# ifndef __ASSUME_PRIVATE_FUTEX
int private_futex;
# else
int __unused1;
# endif
# if __WORDSIZE == 64
int rtld_must_xmm_save;
# endif
/* Reservation of some values for the TM ABI. */
void *__private_tm[5];
# if __WORDSIZE == 64
long int __unused2;
/* Have space for the post-AVX register size. */
__m128 rtld_savespace_sse[8][4];
void *__padding[8];
# endif
} tcbhead_t;
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif
/* We require TLS support in the tools. */
#define HAVE_TLS_SUPPORT 1
#define HAVE___THREAD 1
#define HAVE_TLS_MODEL_ATTRIBUTE 1
/* Signal that TLS support is available. */
#define USE_TLS 1
/* Alignment requirement for the stack. */
#define STACK_ALIGN 16
#ifndef __ASSEMBLER__
/* Get system call information. */
# include <sysdep.h>
/* Get the thread descriptor definition. */
# include <descr.h>
#ifndef LOCK_PREFIX
# ifdef UP
# define LOCK_PREFIX /* nothing */
# else
# define LOCK_PREFIX "lock;"
# endif
#endif
/* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t),
because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
struct pthread even when not linked with -lpthread. */
# define TLS_INIT_TCB_SIZE sizeof (struct pthread)
/* Alignment requirements for the initial TCB. */
# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
/* This is the size of the TCB. */
# define TLS_TCB_SIZE sizeof (struct pthread)
/* Alignment requirements for the TCB. */
//# define TLS_TCB_ALIGN __alignof__ (struct pthread)
// Normally the above would be correct But we have to store post-AVX
// vector registers in the TCB and we want the storage to be aligned.
// unfortunately there isn't yet a type for these values and hence no
// 32-byte alignment requirement. Make this explicit, for now.
# define TLS_TCB_ALIGN 32
/* The TCB can have any size and the memory following the address the
thread pointer points to is unspecified. Allocate the TCB there. */
# define TLS_TCB_AT_TP 1
/* Install the dtv pointer. The pointer passed is to the element with
index -1 which contain the length. */
# define INSTALL_DTV(descr, dtvp) \
((tcbhead_t *) (descr))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(dtvp) \
({ struct pthread *__pd; \
THREAD_SETMEM (__pd, header.dtv, (dtvp)); })
/* Return dtv of given thread descriptor. */
# define GET_DTV(descr) \
(((tcbhead_t *) (descr))->dtv)
/* Macros to load from and store into segment registers. */
# define TLS_GET_FS() \
({ int __seg; __asm__ ("movl %%fs, %0" : "=q" (__seg)); __seg; })
# define TLS_SET_FS(val) \
__asm__ ("movl %0, %%fs" :: "q" (val))
/* Code to initially initialize the thread pointer. This might need
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched.
We have to make the syscall for both uses of the macro since the
address might be (and probably is) different. */
# define TLS_INIT_TP(thrdescr, secondcall) \
({ void *_thrdescr = (thrdescr); \
tcbhead_t *_head = _thrdescr; \
int _result; \
\
_head->tcb = _thrdescr; \
/* For now the thread descriptor is at the same address. */ \
_head->self = _thrdescr; \
\
/* It is a simple syscall to set the %fs value for the thread. */ \
__asm__ __volatile__ ("syscall" \
: "=a" (_result) \
: "0" ((unsigned long int) __NR_arch_prctl), \
"D" ((unsigned long int) ARCH_SET_FS), \
"S" (_thrdescr) \
: "memory", "cc", "r11", "cx"); \
\
_result ? "cannot set %fs base address for thread-local storage" : 0; \
})
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
({ struct pthread *__pd; \
THREAD_GETMEM (__pd, header.dtv); })
/* Return the thread descriptor for the current thread.
The contained asm must *not* be marked __volatile__ since otherwise
assignments like
pthread_descr self = thread_self();
do not get optimized away. */
# define THREAD_SELF \
({ struct pthread *__self; \
__asm__ ("movq %%fs:%c1,%q0" : "=r" (__self) \
: "i" (offsetof (struct pthread, header.self))); \
__self;})
/* Magic for libthread_db to know how to do THREAD_SELF. */
# define DB_THREAD_SELF_INCLUDE <sys/reg.h> /* For the FS constant. */
# define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)
/* Read member of the thread descriptor directly. */
# define THREAD_GETMEM(descr, member) \
({ __typeof (descr->member) __value; \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %%fs:%P2,%b0" \
: "=q" (__value) \
: "0" (0), "i" (offsetof (struct pthread, member))); \
else if (sizeof (__value) == 4) \
__asm__ __volatile__ ("movl %%fs:%P1,%0" \
: "=r" (__value) \
: "i" (offsetof (struct pthread, member))); \
else \
{ \
if (sizeof (__value) != 8) \
/* There should not be any value with a size other than 1, \
4 or 8. */ \
abort (); \
\
__asm__ __volatile__ ("movq %%fs:%P1,%q0" \
: "=r" (__value) \
: "i" (offsetof (struct pthread, member))); \
} \
__value; })
/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
# define THREAD_GETMEM_NC(descr, member, idx) \
({ __typeof (descr->member[0]) __value; \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %%fs:%P2(%q3),%b0" \
: "=q" (__value) \
: "0" (0), "i" (offsetof (struct pthread, member[0])), \
"r" (idx)); \
else if (sizeof (__value) == 4) \
__asm__ __volatile__ ("movl %%fs:%P1(,%q2,4),%0" \
: "=r" (__value) \
: "i" (offsetof (struct pthread, member[0])), "r" (idx));\
else \
{ \
if (sizeof (__value) != 8) \
/* There should not be any value with a size other than 1, \
4 or 8. */ \
abort (); \
\
__asm__ __volatile__ ("movq %%fs:%P1(,%q2,8),%q0" \
: "=r" (__value) \
: "i" (offsetof (struct pthread, member[0])), \
"r" (idx)); \
} \
__value; })
/* Loading addresses of objects on x86-64 needs to be treated special
when generating PIC code. */
#ifdef __pic__
# define IMM_MODE "nr"
#else
# define IMM_MODE "ir"
#endif
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
# define THREAD_SETMEM(descr, member, value) \
({ if (sizeof (descr->member) == 1) \
__asm__ __volatile__ ("movb %b0,%%fs:%P1" : \
: "iq" (value), \
"i" (offsetof (struct pthread, member))); \
else if (sizeof (descr->member) == 4) \
__asm__ __volatile__ ("movl %0,%%fs:%P1" : \
: IMM_MODE (value), \
"i" (offsetof (struct pthread, member))); \
else \
{ \
if (sizeof (descr->member) != 8) \
/* There should not be any value with a size other than 1, \
4 or 8. */ \
abort (); \
\
__asm__ __volatile__ ("movq %q0,%%fs:%P1" : \
: IMM_MODE ((unsigned long int) value), \
"i" (offsetof (struct pthread, member))); \
}})
/* Set member of the thread descriptor directly. */
# define THREAD_SETMEM_NC(descr, member, idx, value) \
({ if (sizeof (descr->member[0]) == 1) \
__asm__ __volatile__ ("movb %b0,%%fs:%P1(%q2)" : \
: "iq" (value), \
"i" (offsetof (struct pthread, member[0])), \
"r" (idx)); \
else if (sizeof (descr->member[0]) == 4) \
__asm__ __volatile__ ("movl %0,%%fs:%P1(,%q2,4)" : \
: IMM_MODE (value), \
"i" (offsetof (struct pthread, member[0])), \
"r" (idx)); \
else \
{ \
if (sizeof (descr->member[0]) != 8) \
/* There should not be any value with a size other than 1, \
4 or 8. */ \
abort (); \
\
__asm__ __volatile__ ("movq %q0,%%fs:%P1(,%q2,8)" : \
: IMM_MODE ((unsigned long int) value), \
"i" (offsetof (struct pthread, member[0])), \
"r" (idx)); \
}})
/* Atomic compare and exchange on TLS, returning old value. */
# define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, newval, oldval) \
({ __typeof (descr->member) __ret; \
__typeof (oldval) __old = (oldval); \
if (sizeof (descr->member) == 4) \
__asm__ __volatile__ (LOCK_PREFIX "cmpxchgl %2, %%fs:%P3" \
: "=a" (__ret) \
: "0" (__old), "r" (newval), \
"i" (offsetof (struct pthread, member))); \
else \
/* Not necessary for other sizes in the moment. */ \
abort (); \
__ret; })
/* Atomic logical and. */
# define THREAD_ATOMIC_AND(descr, member, val) \
(void) ({ if (sizeof ((descr)->member) == 4) \
__asm__ __volatile__ (LOCK_PREFIX "andl %1, %%fs:%P0" \
:: "i" (offsetof (struct pthread, member)), \
"ir" (val)); \
else \
/* Not necessary for other sizes in the moment. */ \
abort (); })
/* Atomic set bit. */
# define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
(void) ({ if (sizeof ((descr)->member) == 4) \
__asm__ __volatile__ (LOCK_PREFIX "orl %1, %%fs:%P0" \
:: "i" (offsetof (struct pthread, member)), \
"ir" (1 << (bit))); \
else \
/* Not necessary for other sizes in the moment. */ \
abort (); })
# define CALL_THREAD_FCT(descr) \
({ void *__res; \
__asm__ __volatile__ ("movq %%fs:%P2, %%rdi\n\t" \
"callq *%%fs:%P1" \
: "=a" (__res) \
: "i" (offsetof (struct pthread, start_routine)), \
"i" (offsetof (struct pthread, arg)) \
: "di", "si", "cx", "dx", "r8", "r9", "r10", "r11", \
"memory", "cc"); \
__res; })
/* Set the stack guard field in TCB head. */
# define THREAD_SET_STACK_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
# define THREAD_COPY_STACK_GUARD(descr) \
((descr)->header.stack_guard \
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
/* Set the pointer guard field in the TCB head. */
# define THREAD_SET_POINTER_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
# define THREAD_COPY_POINTER_GUARD(descr) \
((descr)->header.pointer_guard \
= THREAD_GETMEM (THREAD_SELF, header.pointer_guard))
/* Get and set the global scope generation counter in the TCB head. */
# 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; \
__asm__ __volatile__ ("xchgl %0, %%fs:%P1" \
: "=r" (__res) \
: "i" (offsetof (struct pthread, header.gscope_flag)), \
"0" (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() \
THREAD_SETMEM (THREAD_SELF, header.gscope_flag, THREAD_GSCOPE_FLAG_USED)
# define THREAD_GSCOPE_WAIT() \
GL(dl_wait_lookup_done) ()
# ifdef SHARED
/* Defined in dl-trampoline.S. */
extern void _dl_x86_64_save_sse (void);
extern void _dl_x86_64_restore_sse (void);
# define RTLD_CHECK_FOREIGN_CALL \
(THREAD_GETMEM (THREAD_SELF, header.rtld_must_xmm_save) != 0)
/* NB: Don't use the xchg operation because that would imply a lock
prefix which is expensive and unnecessary. The cache line is also
not contested at all. */
# define RTLD_ENABLE_FOREIGN_CALL \
int old_rtld_must_xmm_save = THREAD_GETMEM (THREAD_SELF, \
header.rtld_must_xmm_save); \
THREAD_SETMEM (THREAD_SELF, header.rtld_must_xmm_save, 1)
# define RTLD_PREPARE_FOREIGN_CALL \
do if (THREAD_GETMEM (THREAD_SELF, header.rtld_must_xmm_save)) \
{ \
_dl_x86_64_save_sse (); \
THREAD_SETMEM (THREAD_SELF, header.rtld_must_xmm_save, 0); \
} \
while (0)
# define RTLD_FINALIZE_FOREIGN_CALL \
do { \
if (THREAD_GETMEM (THREAD_SELF, header.rtld_must_xmm_save) == 0) \
_dl_x86_64_restore_sse (); \
THREAD_SETMEM (THREAD_SELF, header.rtld_must_xmm_save, \
old_rtld_must_xmm_save); \
} while (0)
# endif
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
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