nsprpub/pr/include/md/_linux.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is the Netscape Portable Runtime (NSPR).
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998-2000
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
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  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 /*
  39  * This file is used by not only Linux but also other glibc systems
  40  * such as GNU/Hurd and GNU/k*BSD.
  41  */
  42
  43 #ifndef nspr_linux_defs_h___
  44 #define nspr_linux_defs_h___
  45
  46 #include "prthread.h"
  47
  48 /*
  49  * Internal configuration macros
  50  */
  51
  52 #define PR_LINKER_ARCH  "linux"
  53 #define _PR_SI_SYSNAME  "LINUX"
  54 #ifdef __powerpc64__
  55 #define _PR_SI_ARCHITECTURE "ppc64"
  56 #elif defined(__powerpc__)
  57 #define _PR_SI_ARCHITECTURE "ppc"
  58 #elif defined(__alpha)
  59 #define _PR_SI_ARCHITECTURE "alpha"
  60 #elif defined(__ia64__)
  61 #define _PR_SI_ARCHITECTURE "ia64"
  62 #elif defined(__x86_64__)
  63 #define _PR_SI_ARCHITECTURE "x86-64"
  64 #elif defined(__mc68000__)
  65 #define _PR_SI_ARCHITECTURE "m68k"
  66 #elif defined(__sparc__)
  67 #define _PR_SI_ARCHITECTURE "sparc"
  68 #elif defined(__i386__)
  69 #define _PR_SI_ARCHITECTURE "x86"
  70 #elif defined(__mips__)
  71 #define _PR_SI_ARCHITECTURE "mips"
  72 #elif defined(__arm__)
  73 #define _PR_SI_ARCHITECTURE "arm"
  74 #elif defined(__hppa__)
  75 #define _PR_SI_ARCHITECTURE "hppa"
  76 #elif defined(__s390x__)
  77 #define _PR_SI_ARCHITECTURE "s390x"
  78 #elif defined(__s390__)
  79 #define _PR_SI_ARCHITECTURE "s390"
  80 #else
  81 #error "Unknown CPU architecture"
  82 #endif
  83 #define PR_DLL_SUFFIX           ".so"
  84
  85 #define _PR_VMBASE              0x30000000
  86 #define _PR_STACK_VMBASE        0x50000000
  87 #define _MD_DEFAULT_STACK_SIZE  65536L
  88 #define _MD_MMAP_FLAGS          MAP_PRIVATE
  89
  90 #undef  HAVE_STACK_GROWING_UP
  91
  92 /*
  93  * Elf linux supports dl* functions
  94  */
  95 #define HAVE_DLL
  96 #define USE_DLFCN
  97
  98 #ifdef __FreeBSD_kernel__
  99 #define _PR_HAVE_SOCKADDR_LEN
 100 #endif
 101
 102 #if defined(__i386__)
 103 #define _PR_HAVE_ATOMIC_OPS
 104 #define _MD_INIT_ATOMIC()
 105 extern PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val);
 106 #define _MD_ATOMIC_INCREMENT          _PR_x86_AtomicIncrement
 107 extern PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val);
 108 #define _MD_ATOMIC_DECREMENT          _PR_x86_AtomicDecrement
 109 extern PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 110 #define _MD_ATOMIC_ADD                _PR_x86_AtomicAdd
 111 extern PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
 112 #define _MD_ATOMIC_SET                _PR_x86_AtomicSet
 113 #endif
 114
 115 #if defined(__ia64__)
 116 #define _PR_HAVE_ATOMIC_OPS
 117 #define _MD_INIT_ATOMIC()
 118 extern PRInt32 _PR_ia64_AtomicIncrement(PRInt32 *val);
 119 #define _MD_ATOMIC_INCREMENT          _PR_ia64_AtomicIncrement
 120 extern PRInt32 _PR_ia64_AtomicDecrement(PRInt32 *val);
 121 #define _MD_ATOMIC_DECREMENT          _PR_ia64_AtomicDecrement
 122 extern PRInt32 _PR_ia64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 123 #define _MD_ATOMIC_ADD                _PR_ia64_AtomicAdd
 124 extern PRInt32 _PR_ia64_AtomicSet(PRInt32 *val, PRInt32 newval);
 125 #define _MD_ATOMIC_SET                _PR_ia64_AtomicSet
 126 #endif
 127
 128 #if defined(__x86_64__)
 129 #define _PR_HAVE_ATOMIC_OPS
 130 #define _MD_INIT_ATOMIC()
 131 extern PRInt32 _PR_x86_64_AtomicIncrement(PRInt32 *val);
 132 #define _MD_ATOMIC_INCREMENT          _PR_x86_64_AtomicIncrement
 133 extern PRInt32 _PR_x86_64_AtomicDecrement(PRInt32 *val);
 134 #define _MD_ATOMIC_DECREMENT          _PR_x86_64_AtomicDecrement
 135 extern PRInt32 _PR_x86_64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 136 #define _MD_ATOMIC_ADD                _PR_x86_64_AtomicAdd
 137 extern PRInt32 _PR_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval);
 138 #define _MD_ATOMIC_SET                _PR_x86_64_AtomicSet
 139 #endif
 140
 141 #if defined(__powerpc__) && !defined(__powerpc64__)
 142 #define _PR_HAVE_ATOMIC_OPS
 143 #define _MD_INIT_ATOMIC()
 144 extern PRInt32 _PR_ppc_AtomicIncrement(PRInt32 *val);
 145 #define _MD_ATOMIC_INCREMENT          _PR_ppc_AtomicIncrement
 146 extern PRInt32 _PR_ppc_AtomicDecrement(PRInt32 *val);
 147 #define _MD_ATOMIC_DECREMENT          _PR_ppc_AtomicDecrement
 148 extern PRInt32 _PR_ppc_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 149 #define _MD_ATOMIC_ADD                _PR_ppc_AtomicAdd
 150 extern PRInt32 _PR_ppc_AtomicSet(PRInt32 *val, PRInt32 newval);
 151 #define _MD_ATOMIC_SET                _PR_ppc_AtomicSet
 152 #endif
 153
 154 #if defined(__alpha)
 155 #define _PR_HAVE_ATOMIC_OPS
 156 #define _MD_INIT_ATOMIC()
 157 #define _MD_ATOMIC_ADD(ptr, i) ({               \
 158     PRInt32 __atomic_tmp, __atomic_ret;   \
 159     __asm__ __volatile__(                       \
 160     "1: ldl_l   %[ret], %[val]          \n"     \
 161     "   addl    %[ret], %[inc], %[tmp]  \n"     \
 162     "   addl    %[ret], %[inc], %[ret]  \n"     \
 163     "   stl_c   %[tmp], %[val]          \n"     \
 164     "   beq     %[tmp], 2f              \n"     \
 165     ".subsection 2                      \n"     \
 166     "2: br      1b                      \n"     \
 167     ".previous"                                 \
 168     : [ret] "=&r" (__atomic_ret),               \
 169       [tmp] "=&r" (__atomic_tmp),               \
 170       [val] "=m" (*ptr)                         \
 171     : [inc] "Ir" (i), "m" (*ptr));              \
 172     __atomic_ret;                               \
 173 })
 174 #define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
 175 #define _MD_ATOMIC_DECREMENT(ptr) ({            \
 176     PRInt32 __atomic_tmp, __atomic_ret;   \
 177     __asm__ __volatile__(                       \
 178     "1: ldl_l   %[ret], %[val]          \n"     \
 179     "   subl    %[ret], 1, %[tmp]       \n"     \
 180     "   subl    %[ret], 1, %[ret]       \n"     \
 181     "   stl_c   %[tmp], %[val]          \n"     \
 182     "   beq     %[tmp], 2f              \n"     \
 183     ".subsection 2                      \n"     \
 184     "2: br      1b                      \n"     \
 185     ".previous"                                 \
 186     : [ret] "=&r" (__atomic_ret),               \
 187       [tmp] "=&r" (__atomic_tmp),               \
 188       [val] "=m" (*ptr)                         \
 189     : "m" (*ptr));                              \
 190     __atomic_ret;                               \
 191 })
 192 #define _MD_ATOMIC_SET(ptr, n) ({               \
 193     PRInt32 __atomic_tmp, __atomic_ret;   \
 194     __asm__ __volatile__(                       \
 195     "1: ldl_l   %[ret], %[val]          \n"     \
 196     "   mov     %[newval], %[tmp]       \n"     \
 197     "   stl_c   %[tmp], %[val]          \n"     \
 198     "   beq     %[tmp], 2f              \n"     \
 199     ".subsection 2                      \n"     \
 200     "2: br      1b                      \n"     \
 201     ".previous"                                 \
 202     : [ret] "=&r" (__atomic_ret),               \
 203       [tmp] "=&r"(__atomic_tmp),                \
 204       [val] "=m" (*ptr)                         \
 205     : [newval] "Ir" (n), "m" (*ptr));           \
 206     __atomic_ret;                               \
 207 })
 208 #endif
 209
 210 #if defined(__arm__) && defined(_PR_ARM_KUSER)
 211 #define _PR_HAVE_ATOMIC_OPS
 212 #define _MD_INIT_ATOMIC()
 213
 214 /*
 215  * The kernel provides this helper function at a fixed address with a fixed
 216  * ABI signature, directly callable from user space.
 217  *
 218  * Definition:
 219  * Atomically store newval in *ptr if *ptr is equal to oldval.
 220  * Return zero if *ptr was changed or non-zero if no exchange happened.
 221  */
 222 typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr);
 223 #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)
 224
 225 #define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
 226 #define _MD_ATOMIC_DECREMENT(ptr) _MD_ATOMIC_ADD(ptr, -1)
 227
 228 static inline PRInt32 _MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 n)
 229 {
 230     PRInt32 ov, nv;
 231     volatile PRInt32 *vp = ptr;
 232
 233     do {
 234         ov = *vp;
 235         nv = ov + n;
 236     } while (__kernel_cmpxchg(ov, nv, vp));
 237
 238     return nv;
 239 }
 240
 241 static inline PRInt32 _MD_ATOMIC_SET(PRInt32 *ptr, PRInt32 nv)
 242 {
 243     PRInt32 ov;
 244     volatile PRInt32 *vp = ptr;
 245
 246     do {
 247         ov = *vp;
 248     } while (__kernel_cmpxchg(ov, nv, vp));
 249
 250     return ov;
 251 }
 252 #endif
 253
 254 #define USE_SETJMP
 255 #if defined(__GLIBC__) && __GLIBC__ >= 2
 256 #define _PR_POLL_AVAILABLE
 257 #endif
 258 #undef _PR_USE_POLL
 259 #define _PR_STAT_HAS_ONLY_ST_ATIME
 260 #if defined(__alpha) || defined(__ia64__)
 261 #define _PR_HAVE_LARGE_OFF_T
 262 #elif (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 263 #define _PR_HAVE_OFF64_T
 264 #else
 265 #define _PR_NO_LARGE_FILES
 266 #endif
 267 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 268 #define _PR_INET6
 269 #define _PR_HAVE_INET_NTOP
 270 #define _PR_HAVE_GETHOSTBYNAME2
 271 #define _PR_HAVE_GETADDRINFO
 272 #define _PR_INET6_PROBE
 273 #endif
 274 #define _PR_HAVE_SYSV_SEMAPHORES
 275 #define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
 276 #if (__GLIBC__ >= 2) && defined(_PR_PTHREADS)
 277 #define _PR_HAVE_GETHOST_R
 278 #define _PR_HAVE_GETHOST_R_INT
 279 #endif
 280
 281 #ifdef _PR_PTHREADS
 282
 283 extern void _MD_CleanupBeforeExit(void);
 284 #define _MD_CLEANUP_BEFORE_EXIT _MD_CleanupBeforeExit
 285
 286 #else  /* ! _PR_PTHREADS */
 287
 288 #include <setjmp.h>
 289
 290 #define PR_CONTEXT_TYPE sigjmp_buf
 291
 292 #define CONTEXT(_th) ((_th)->md.context)
 293
 294 #ifdef __powerpc__
 295 /*
 296  * PowerPC based MkLinux
 297  *
 298  * On the PowerPC, the new style jmp_buf isn't used until glibc
 299  * 2.1.
 300  */
 301 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 302 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_GPR1]
 303 #else
 304 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__misc[0]
 305 #endif /* glibc 2.1 or later */
 306 #define _MD_SET_FP(_t, val)
 307 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 308 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 309 /* aix = 64, macos = 70 */
 310 #define PR_NUM_GCREGS  64
 311
 312 #elif defined(__alpha)
 313 /* Alpha based Linux */
 314
 315 #if defined(__GLIBC__) && __GLIBC__ >= 2
 316 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 317 #define _MD_SET_FP(_t, val)
 318 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 319 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 320 #define _MD_SP_TYPE long int
 321 #else
 322 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 323 #define _MD_SET_FP(_t, val)
 324 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 325 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 326 #define _MD_SP_TYPE __ptr_t
 327 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 328
 329 /* XXX not sure if this is correct, or maybe it should be 17? */
 330 #define PR_NUM_GCREGS 9
 331
 332 #elif defined(__ia64__)
 333
 334 #define _MD_GET_SP(_t)      ((long *)((_t)->md.context[0].__jmpbuf)[0])
 335 #define _MD_SET_FP(_t, val)
 336 #define _MD_GET_SP_PTR(_t)  &(_MD_GET_SP(_t))
 337 #define _MD_GET_FP_PTR(_t)  ((void *) 0)
 338 #define _MD_SP_TYPE         long int
 339
 340 #define PR_NUM_GCREGS       _JBLEN
 341
 342 #elif defined(__mc68000__)
 343 /* m68k based Linux */
 344
 345 /*
 346  * On the m68k, glibc still uses the old style sigjmp_buf, even
 347  * in glibc 2.0.7.
 348  */
 349 #if defined(__GLIBC__) && __GLIBC__ >= 2
 350 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 351 #define _MD_SET_FP(_t, val)
 352 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 353 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 354 #define _MD_SP_TYPE int
 355 #else
 356 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 357 #define _MD_SET_FP(_t, val)
 358 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 359 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 360 #define _MD_SP_TYPE __ptr_t
 361 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 362
 363 /* XXX not sure if this is correct, or maybe it should be 17? */
 364 #define PR_NUM_GCREGS 9
 365
 366 #elif defined(__sparc__)
 367 /* Sparc */
 368 #if defined(__GLIBC__) && __GLIBC__ >= 2
 369 /*
 370  * You need glibc2-2.0.7-25 or later. The libraries that came with
 371  * Red Hat 5.1 are not new enough, but they are in 5.2.
 372  */
 373 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 374 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_FP] = val)
 375 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 376 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_FP])
 377 #define _MD_SP_TYPE int
 378 #else
 379 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__fp
 380 #define _MD_SET_FP(_t, val)
 381 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 382 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 383 #define _MD_SP_TYPE __ptr_t
 384 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 385
 386 #elif defined(__i386__)
 387 /* Intel based Linux */
 388 #if defined(__GLIBC__) && __GLIBC__ >= 2
 389 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 390 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_BP] = val)
 391 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 392 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_BP])
 393 #define _MD_SP_TYPE int
 394 #else
 395 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 396 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__bp = val)
 397 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 398 #define _MD_GET_FP_PTR(_t) &((_t)->md.context[0].__jmpbuf[0].__bp)
 399 #define _MD_SP_TYPE __ptr_t
 400 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 401 #define PR_NUM_GCREGS   6
 402
 403 #elif defined(__mips__)
 404 /* Linux/MIPS */
 405 #if defined(__GLIBC__) && __GLIBC__ >= 2
 406 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 407 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__fp = (val))
 408 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 409 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[0].__fp)
 410 #define _MD_SP_TYPE __ptr_t
 411 #else
 412 #error "Linux/MIPS pre-glibc2 not supported yet"
 413 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 414
 415 #elif defined(__arm__)
 416 /* ARM/Linux */
 417 #if defined(__GLIBC__) && __GLIBC__ >= 2
 418 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[20]
 419 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[19] = (val))
 420 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 421 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[19])
 422 #define _MD_SP_TYPE __ptr_t
 423 #else
 424 #error "ARM/Linux pre-glibc2 not supported yet"
 425 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 426
 427 #else
 428
 429 #error "Unknown CPU architecture"
 430
 431 #endif /*__powerpc__*/
 432
 433 /*
 434 ** Initialize a thread context to run "_main()" when started
 435 */
 436 #ifdef __powerpc__
 437
 438 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 439 {  \
 440     *status = PR_TRUE;  \
 441     if (sigsetjmp(CONTEXT(_thread), 1)) {  \
 442         _main();  \
 443     }  \
 444     _MD_GET_SP(_thread) = (unsigned char*) ((_sp) - 128); \
 445     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
 446     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
 447     _MD_SET_FP(_thread, 0); \
 448 }
 449
 450 #elif defined(__mips__)
 451
 452 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 453 {  \
 454     *status = PR_TRUE;  \
 455     (void) sigsetjmp(CONTEXT(_thread), 1);  \
 456     _thread->md.context[0].__jmpbuf[0].__pc = (__ptr_t) _main;  \
 457     _MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
 458     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
 459     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
 460     _MD_SET_FP(_thread, 0); \
 461 }
 462
 463 #else
 464
 465 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 466 {  \
 467     *status = PR_TRUE;  \
 468     if (sigsetjmp(CONTEXT(_thread), 1)) {  \
 469         _main();  \
 470     }  \
 471     _MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
 472     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
 473     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
 474     _MD_SET_FP(_thread, 0); \
 475 }
 476
 477 #endif /*__powerpc__*/
 478
 479 #define _MD_SWITCH_CONTEXT(_thread)  \
 480     if (!sigsetjmp(CONTEXT(_thread), 1)) {  \
 481         (_thread)->md.errcode = errno;  \
 482         _PR_Schedule();  \
 483     }
 484
 485 /*
 486 ** Restore a thread context, saved by _MD_SWITCH_CONTEXT
 487 */
 488 #define _MD_RESTORE_CONTEXT(_thread) \
 489 {   \
 490     errno = (_thread)->md.errcode;  \
 491     _MD_SET_CURRENT_THREAD(_thread);  \
 492     siglongjmp(CONTEXT(_thread), 1);  \
 493 }
 494
 495 /* Machine-dependent (MD) data structures */
 496
 497 struct _MDThread {
 498     PR_CONTEXT_TYPE context;
 499     void *sp;
 500     void *fp;
 501     int id;
 502     int errcode;
 503 };
 504
 505 struct _MDThreadStack {
 506     PRInt8 notused;
 507 };
 508
 509 struct _MDLock {
 510     PRInt8 notused;
 511 };
 512
 513 struct _MDSemaphore {
 514     PRInt8 notused;
 515 };
 516
 517 struct _MDCVar {
 518     PRInt8 notused;
 519 };
 520
 521 struct _MDSegment {
 522     PRInt8 notused;
 523 };
 524
 525 /*
 526  * md-specific cpu structure field
 527  */
 528 #include <sys/time.h>  /* for FD_SETSIZE */
 529 #define _PR_MD_MAX_OSFD FD_SETSIZE
 530
 531 struct _MDCPU_Unix {
 532     PRCList ioQ;
 533     PRUint32 ioq_timeout;
 534     PRInt32 ioq_max_osfd;
 535     PRInt32 ioq_osfd_cnt;
 536 #ifndef _PR_USE_POLL
 537     fd_set fd_read_set, fd_write_set, fd_exception_set;
 538     PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD],fd_write_cnt[_PR_MD_MAX_OSFD],
 539             fd_exception_cnt[_PR_MD_MAX_OSFD];
 540 #else
 541     struct pollfd *ioq_pollfds;
 542     int ioq_pollfds_size;
 543 #endif  /* _PR_USE_POLL */
 544 };
 545
 546 #define _PR_IOQ(_cpu)                   ((_cpu)->md.md_unix.ioQ)
 547 #define _PR_ADD_TO_IOQ(_pq, _cpu) PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
 548 #define _PR_FD_READ_SET(_cpu)           ((_cpu)->md.md_unix.fd_read_set)
 549 #define _PR_FD_READ_CNT(_cpu)           ((_cpu)->md.md_unix.fd_read_cnt)
 550 #define _PR_FD_WRITE_SET(_cpu)          ((_cpu)->md.md_unix.fd_write_set)
 551 #define _PR_FD_WRITE_CNT(_cpu)          ((_cpu)->md.md_unix.fd_write_cnt)
 552 #define _PR_FD_EXCEPTION_SET(_cpu)      ((_cpu)->md.md_unix.fd_exception_set)
 553 #define _PR_FD_EXCEPTION_CNT(_cpu)      ((_cpu)->md.md_unix.fd_exception_cnt)
 554 #define _PR_IOQ_TIMEOUT(_cpu)           ((_cpu)->md.md_unix.ioq_timeout)
 555 #define _PR_IOQ_MAX_OSFD(_cpu)          ((_cpu)->md.md_unix.ioq_max_osfd)
 556 #define _PR_IOQ_OSFD_CNT(_cpu)          ((_cpu)->md.md_unix.ioq_osfd_cnt)
 557 #define _PR_IOQ_POLLFDS(_cpu)           ((_cpu)->md.md_unix.ioq_pollfds)
 558 #define _PR_IOQ_POLLFDS_SIZE(_cpu)      ((_cpu)->md.md_unix.ioq_pollfds_size)
 559
 560 #define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu)  32
 561
 562 struct _MDCPU {
 563     struct _MDCPU_Unix md_unix;
 564 };
 565
 566 #define _MD_INIT_LOCKS()
 567 #define _MD_NEW_LOCK(lock) PR_SUCCESS
 568 #define _MD_FREE_LOCK(lock)
 569 #define _MD_LOCK(lock)
 570 #define _MD_UNLOCK(lock)
 571 #define _MD_INIT_IO()
 572 #define _MD_IOQ_LOCK()
 573 #define _MD_IOQ_UNLOCK()
 574
 575 extern PRStatus _MD_InitializeThread(PRThread *thread);
 576
 577 #define _MD_INIT_RUNNING_CPU(cpu)       _MD_unix_init_running_cpu(cpu)
 578 #define _MD_INIT_THREAD                 _MD_InitializeThread
 579 #define _MD_EXIT_THREAD(thread)
 580 #define _MD_SUSPEND_THREAD(thread)      _MD_suspend_thread
 581 #define _MD_RESUME_THREAD(thread)       _MD_resume_thread
 582 #define _MD_CLEAN_THREAD(_thread)
 583
 584 extern PRStatus _MD_CREATE_THREAD(
 585     PRThread *thread,
 586     void (*start) (void *),
 587     PRThreadPriority priority,
 588     PRThreadScope scope,
 589     PRThreadState state,
 590     PRUint32 stackSize);
 591 extern void _MD_SET_PRIORITY(struct _MDThread *thread, PRUintn newPri);
 592 extern PRStatus _MD_WAIT(PRThread *, PRIntervalTime timeout);
 593 extern PRStatus _MD_WAKEUP_WAITER(PRThread *);
 594 extern void _MD_YIELD(void);
 595
 596 #endif /* ! _PR_PTHREADS */
 597
 598 extern void _MD_EarlyInit(void);
 599 extern PRIntervalTime _PR_UNIX_GetInterval(void);
 600 extern PRIntervalTime _PR_UNIX_TicksPerSecond(void);
 601
 602 #define _MD_EARLY_INIT                  _MD_EarlyInit
 603 #define _MD_FINAL_INIT                  _PR_UnixInit
 604 #define _MD_GET_INTERVAL                _PR_UNIX_GetInterval
 605 #define _MD_INTERVAL_PER_SEC            _PR_UNIX_TicksPerSecond
 606
 607 /*
 608  * We wrapped the select() call.  _MD_SELECT refers to the built-in,
 609  * unwrapped version.
 610  */
 611 #define _MD_SELECT __select
 612
 613 #ifdef _PR_POLL_AVAILABLE
 614 #include <sys/poll.h>
 615 extern int __syscall_poll(struct pollfd *ufds, unsigned long int nfds,
 616         int timeout);
 617 #define _MD_POLL __syscall_poll
 618 #endif
 619
 620 /* For writev() */
 621 #include <sys/uio.h>
 622
 623 extern void _MD_linux_map_sendfile_error(int err);
 624
 625 #endif /* nspr_linux_defs_h___ */