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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 | /* Special definitions for ix86 machine using segment register based thread descriptor. Copyright (C) 1998, 2000, 2001, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>. 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; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASSEMBLER__ #include <stddef.h> /* For offsetof. */ #include <stdlib.h> /* For abort(). */ /* We don't want to include the kernel header. So duplicate the information. */ /* Structure passed on `modify_ldt' call. */ struct modify_ldt_ldt_s { unsigned int entry_number; unsigned long int base_addr; unsigned int limit; unsigned int seg_32bit:1; unsigned int contents:2; unsigned int read_exec_only:1; unsigned int limit_in_pages:1; unsigned int seg_not_present:1; unsigned int useable:1; unsigned int empty:25; }; /* System call to set LDT entry. */ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t); /* 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 \ ({ \ register pthread_descr __self; \ __asm__ ("movl %%gs:%c1,%0" : "=r" (__self) \ : "i" (offsetof (struct _pthread_descr_struct, \ p_header.data.self))); \ __self; \ }) /* Initialize the thread-unique value. Two possible ways to do it. */ #define DO_MODIFY_LDT(descr, nr) \ ({ \ struct modify_ldt_ldt_s ldt_entry = \ { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ 1, 0, 0, 1, 0, 1, 0 }; \ if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) \ abort (); \ __asm__ ("movw %w0, %%gs" : : "q" (nr * 8 + 7)); \ }) #ifdef __PIC__ # define USETLS_EBX_ARG "r" # define USETLS_LOAD_EBX "xchgl %3, %%ebx\n\t" #else # define USETLS_EBX_ARG "b" # define USETLS_LOAD_EBX #endif /* When using the new set_thread_area call, we don't need to change %gs because we inherited the value set up in the main thread by TLS setup. We need to extract that value and set up the same segment in this thread. */ #if USE_TLS # define DO_SET_THREAD_AREA_REUSE(nr) 1 #else /* Without TLS, we do the initialization of the main thread, where NR == 0. */ # define DO_SET_THREAD_AREA_REUSE(nr) (!__builtin_constant_p (nr) || (nr)) #endif #define DO_SET_THREAD_AREA(descr, nr) \ ({ \ int __gs; \ if (DO_SET_THREAD_AREA_REUSE (nr)) \ { \ __asm__ ("movw %%gs, %w0" : "=q" (__gs)); \ struct modify_ldt_ldt_s ldt_entry = \ { (__gs & 0xffff) >> 3, \ (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ 1, 0, 0, 1, 0, 1, 0 }; \ \ int __result; \ __asm__ (USETLS_LOAD_EBX \ "movl %2, %%eax\n\t" \ "int $0x80\n\t" \ USETLS_LOAD_EBX \ : "&a" (__result) \ : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \ if (__result == 0) \ __asm__ ("movw %w0, %%gs" :: "q" (__gs)); \ else \ __gs = -1; \ } \ else \ { \ struct modify_ldt_ldt_s ldt_entry = \ { -1, \ (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ 1, 0, 0, 1, 0, 1, 0 }; \ int __result; \ __asm__ (USETLS_LOAD_EBX \ "movl %2, %%eax\n\t" \ "int $0x80\n\t" \ USETLS_LOAD_EBX \ : "&a" (__result) \ : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \ if (__result == 0) \ { \ __gs = (ldt_entry.entry_number << 3) + 3; \ __asm__ ("movw %w0, %%gs" : : "q" (__gs)); \ } \ else \ __gs = -1; \ } \ __gs; \ }) #if defined __ASSUME_SET_THREAD_AREA_SYSCALL # define INIT_THREAD_SELF(descr, nr) DO_SET_THREAD_AREA (descr, nr) #elif defined __NR_set_thread_area # define INIT_THREAD_SELF(descr, nr) \ ({ \ if (__builtin_expect (__have_no_set_thread_area, 0) \ || (DO_SET_THREAD_AREA (descr, DO_SET_THREAD_AREA_REUSE (nr)) == -1 \ && (__have_no_set_thread_area = 1))) \ DO_MODIFY_LDT (descr, nr); \ }) /* Defined in pspinlock.c. */ extern int __have_no_set_thread_area; #else # define INIT_THREAD_SELF(descr, nr) DO_MODIFY_LDT (descr, nr) #endif /* Free resources associated with thread descriptor. */ #ifdef __ASSUME_SET_THREAD_AREA_SYSCALL #define FREE_THREAD(descr, nr) do { } while (0) #elif defined __NR_set_thread_area #define FREE_THREAD(descr, nr) \ { \ int __gs; \ __asm__ __volatile__ ("movw %%gs, %w0" : "=q" (__gs)); \ if (__builtin_expect (__gs & 4, 0)) \ { \ struct modify_ldt_ldt_s ldt_entry = \ { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \ __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \ } \ } #else #define FREE_THREAD(descr, nr) \ { \ struct modify_ldt_ldt_s ldt_entry = \ { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \ __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \ } #endif /* Read member of the thread descriptor directly. */ #define THREAD_GETMEM(descr, member) \ ({ \ __typeof__ (descr->member) __value; \ if (sizeof (__value) == 1) \ __asm__ __volatile__ ("movb %%gs:%P2,%b0" \ : "=q" (__value) \ : "0" (0), \ "i" (offsetof (struct _pthread_descr_struct, \ member))); \ else if (sizeof (__value) == 4) \ __asm__ __volatile__ ("movl %%gs:%P1,%0" \ : "=r" (__value) \ : "i" (offsetof (struct _pthread_descr_struct, \ member))); \ else \ { \ if (sizeof (__value) != 8) \ /* There should not be any value with a size other than 1, 4 or 8. */\ abort (); \ \ __asm__ __volatile__ ("movl %%gs:%P1,%%eax\n\t" \ "movl %%gs:%P2,%%edx" \ : "=A" (__value) \ : "i" (offsetof (struct _pthread_descr_struct, \ member)), \ "i" (offsetof (struct _pthread_descr_struct, \ member) + 4)); \ } \ __value; \ }) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ #define THREAD_GETMEM_NC(descr, member) \ ({ \ __typeof__ (descr->member) __value; \ if (sizeof (__value) == 1) \ __asm__ __volatile__ ("movb %%gs:(%2),%b0" \ : "=q" (__value) \ : "0" (0), \ "r" (offsetof (struct _pthread_descr_struct, \ member))); \ else if (sizeof (__value) == 4) \ __asm__ __volatile__ ("movl %%gs:(%1),%0" \ : "=r" (__value) \ : "r" (offsetof (struct _pthread_descr_struct, \ member))); \ else \ { \ if (sizeof (__value) != 8) \ /* There should not be any value with a size other than 1, 4 or 8. */\ abort (); \ \ __asm__ __volatile__ ("movl %%gs:(%1),%%eax\n\t" \ "movl %%gs:4(%1),%%edx" \ : "=&A" (__value) \ : "r" (offsetof (struct _pthread_descr_struct, \ member))); \ } \ __value; \ }) /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ #define THREAD_SETMEM(descr, member, value) \ ({ \ __typeof__ (descr->member) __value = (value); \ if (sizeof (__value) == 1) \ __asm__ __volatile__ ("movb %0,%%gs:%P1" : \ : "q" (__value), \ "i" (offsetof (struct _pthread_descr_struct, \ member))); \ else if (sizeof (__value) == 4) \ __asm__ __volatile__ ("movl %0,%%gs:%P1" : \ : "r" (__value), \ "i" (offsetof (struct _pthread_descr_struct, \ member))); \ else \ { \ if (sizeof (__value) != 8) \ /* There should not be any value with a size other than 1, 4 or 8. */\ abort (); \ \ __asm__ __volatile__ ("movl %%eax,%%gs:%P1\n\n" \ "movl %%edx,%%gs:%P2" : \ : "A" (__value), \ "i" (offsetof (struct _pthread_descr_struct, \ member)), \ "i" (offsetof (struct _pthread_descr_struct, \ member) + 4)); \ } \ }) /* Set member of the thread descriptor directly. */ #define THREAD_SETMEM_NC(descr, member, value) \ ({ \ __typeof__ (descr->member) __value = (value); \ if (sizeof (__value) == 1) \ __asm__ __volatile__ ("movb %0,%%gs:(%1)" : \ : "q" (__value), \ "r" (offsetof (struct _pthread_descr_struct, \ member))); \ else if (sizeof (__value) == 4) \ __asm__ __volatile__ ("movl %0,%%gs:(%1)" : \ : "r" (__value), \ "r" (offsetof (struct _pthread_descr_struct, \ member))); \ else \ { \ if (sizeof (__value) != 8) \ /* There should not be any value with a size other than 1, 4 or 8. */\ abort (); \ \ __asm__ __volatile__ ("movl %%eax,%%gs:(%1)\n\t" \ "movl %%edx,%%gs:4(%1)" : \ : "A" (__value), \ "r" (offsetof (struct _pthread_descr_struct, \ member))); \ } \ }) #endif /* We want the OS to assign stack addresses. */ #define FLOATING_STACKS 1 /* Maximum size of the stack if the rlimit is unlimited. */ #define ARCH_STACK_MAX_SIZE 8*1024*1024 |