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
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  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__) && defined(__arch64__)
  67 #define _PR_SI_ARCHITECTURE "sparc64"
  68 #elif defined(__sparc__)
  69 #define _PR_SI_ARCHITECTURE "sparc"
  70 #elif defined(__i386__)
  71 #define _PR_SI_ARCHITECTURE "x86"
  72 #elif defined(__mips__)
  73 #define _PR_SI_ARCHITECTURE "mips"
  74 #elif defined(__arm__)
  75 #define _PR_SI_ARCHITECTURE "arm"
  76 #elif defined(__hppa__)
  77 #define _PR_SI_ARCHITECTURE "hppa"
  78 #elif defined(__s390x__)
  79 #define _PR_SI_ARCHITECTURE "s390x"
  80 #elif defined(__s390__)
  81 #define _PR_SI_ARCHITECTURE "s390"
  82 #else
  83 #error "Unknown CPU architecture"
  84 #endif
  85 #define PR_DLL_SUFFIX           ".so"
  86
  87 #define _PR_VMBASE              0x30000000
  88 #define _PR_STACK_VMBASE        0x50000000
  89 #define _MD_DEFAULT_STACK_SIZE  65536L
  90 #define _MD_MMAP_FLAGS          MAP_PRIVATE
  91
  92 #undef  HAVE_STACK_GROWING_UP
  93
  94 /*
  95  * Elf linux supports dl* functions
  96  */
  97 #define HAVE_DLL
  98 #define USE_DLFCN
  99
 100 #ifdef __FreeBSD_kernel__
 101 #define _PR_HAVE_SOCKADDR_LEN
 102 #endif
 103
 104 #if defined(__i386__)
 105 #define _PR_HAVE_ATOMIC_OPS
 106 #define _MD_INIT_ATOMIC()
 107 extern PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val);
 108 #define _MD_ATOMIC_INCREMENT          _PR_x86_AtomicIncrement
 109 extern PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val);
 110 #define _MD_ATOMIC_DECREMENT          _PR_x86_AtomicDecrement
 111 extern PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 112 #define _MD_ATOMIC_ADD                _PR_x86_AtomicAdd
 113 extern PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
 114 #define _MD_ATOMIC_SET                _PR_x86_AtomicSet
 115 #endif
 116
 117 #if defined(__ia64__)
 118 #define _PR_HAVE_ATOMIC_OPS
 119 #define _MD_INIT_ATOMIC()
 120 extern PRInt32 _PR_ia64_AtomicIncrement(PRInt32 *val);
 121 #define _MD_ATOMIC_INCREMENT          _PR_ia64_AtomicIncrement
 122 extern PRInt32 _PR_ia64_AtomicDecrement(PRInt32 *val);
 123 #define _MD_ATOMIC_DECREMENT          _PR_ia64_AtomicDecrement
 124 extern PRInt32 _PR_ia64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 125 #define _MD_ATOMIC_ADD                _PR_ia64_AtomicAdd
 126 extern PRInt32 _PR_ia64_AtomicSet(PRInt32 *val, PRInt32 newval);
 127 #define _MD_ATOMIC_SET                _PR_ia64_AtomicSet
 128 #endif
 129
 130 #if defined(__x86_64__)
 131 #define _PR_HAVE_ATOMIC_OPS
 132 #define _MD_INIT_ATOMIC()
 133 extern PRInt32 _PR_x86_64_AtomicIncrement(PRInt32 *val);
 134 #define _MD_ATOMIC_INCREMENT          _PR_x86_64_AtomicIncrement
 135 extern PRInt32 _PR_x86_64_AtomicDecrement(PRInt32 *val);
 136 #define _MD_ATOMIC_DECREMENT          _PR_x86_64_AtomicDecrement
 137 extern PRInt32 _PR_x86_64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 138 #define _MD_ATOMIC_ADD                _PR_x86_64_AtomicAdd
 139 extern PRInt32 _PR_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval);
 140 #define _MD_ATOMIC_SET                _PR_x86_64_AtomicSet
 141 #endif
 142
 143 #if defined(__powerpc__) && !defined(__powerpc64__)
 144 #define _PR_HAVE_ATOMIC_OPS
 145 #define _MD_INIT_ATOMIC()
 146 extern PRInt32 _PR_ppc_AtomicIncrement(PRInt32 *val);
 147 #define _MD_ATOMIC_INCREMENT          _PR_ppc_AtomicIncrement
 148 extern PRInt32 _PR_ppc_AtomicDecrement(PRInt32 *val);
 149 #define _MD_ATOMIC_DECREMENT          _PR_ppc_AtomicDecrement
 150 extern PRInt32 _PR_ppc_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 151 #define _MD_ATOMIC_ADD                _PR_ppc_AtomicAdd
 152 extern PRInt32 _PR_ppc_AtomicSet(PRInt32 *val, PRInt32 newval);
 153 #define _MD_ATOMIC_SET                _PR_ppc_AtomicSet
 154 #endif
 155
 156 #if defined(__alpha)
 157 #define _PR_HAVE_ATOMIC_OPS
 158 #define _MD_INIT_ATOMIC()
 159 #define _MD_ATOMIC_ADD(ptr, i) ({               \
 160     PRInt32 __atomic_tmp, __atomic_ret;   \
 161     __asm__ __volatile__(                       \
 162     "1: ldl_l   %[ret], %[val]          \n"     \
 163     "   addl    %[ret], %[inc], %[tmp]  \n"     \
 164     "   addl    %[ret], %[inc], %[ret]  \n"     \
 165     "   stl_c   %[tmp], %[val]          \n"     \
 166     "   beq     %[tmp], 2f              \n"     \
 167     ".subsection 2                      \n"     \
 168     "2: br      1b                      \n"     \
 169     ".previous"                                 \
 170     : [ret] "=&r" (__atomic_ret),               \
 171       [tmp] "=&r" (__atomic_tmp),               \
 172       [val] "=m" (*ptr)                         \
 173     : [inc] "Ir" (i), "m" (*ptr));              \
 174     __atomic_ret;                               \
 175 })
 176 #define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
 177 #define _MD_ATOMIC_DECREMENT(ptr) ({            \
 178     PRInt32 __atomic_tmp, __atomic_ret;   \
 179     __asm__ __volatile__(                       \
 180     "1: ldl_l   %[ret], %[val]          \n"     \
 181     "   subl    %[ret], 1, %[tmp]       \n"     \
 182     "   subl    %[ret], 1, %[ret]       \n"     \
 183     "   stl_c   %[tmp], %[val]          \n"     \
 184     "   beq     %[tmp], 2f              \n"     \
 185     ".subsection 2                      \n"     \
 186     "2: br      1b                      \n"     \
 187     ".previous"                                 \
 188     : [ret] "=&r" (__atomic_ret),               \
 189       [tmp] "=&r" (__atomic_tmp),               \
 190       [val] "=m" (*ptr)                         \
 191     : "m" (*ptr));                              \
 192     __atomic_ret;                               \
 193 })
 194 #define _MD_ATOMIC_SET(ptr, n) ({               \
 195     PRInt32 __atomic_tmp, __atomic_ret;   \
 196     __asm__ __volatile__(                       \
 197     "1: ldl_l   %[ret], %[val]          \n"     \
 198     "   mov     %[newval], %[tmp]       \n"     \
 199     "   stl_c   %[tmp], %[val]          \n"     \
 200     "   beq     %[tmp], 2f              \n"     \
 201     ".subsection 2                      \n"     \
 202     "2: br      1b                      \n"     \
 203     ".previous"                                 \
 204     : [ret] "=&r" (__atomic_ret),               \
 205       [tmp] "=&r"(__atomic_tmp),                \
 206       [val] "=m" (*ptr)                         \
 207     : [newval] "Ir" (n), "m" (*ptr));           \
 208     __atomic_ret;                               \
 209 })
 210 #endif
 211
 212 #if defined(__arm__) && defined(_PR_ARM_KUSER)
 213 #define _PR_HAVE_ATOMIC_OPS
 214 #define _MD_INIT_ATOMIC()
 215
 216 /*
 217  * The kernel provides this helper function at a fixed address with a fixed
 218  * ABI signature, directly callable from user space.
 219  *
 220  * Definition:
 221  * Atomically store newval in *ptr if *ptr is equal to oldval.
 222  * Return zero if *ptr was changed or non-zero if no exchange happened.
 223  */
 224 typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr);
 225 #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)
 226
 227 #define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
 228 #define _MD_ATOMIC_DECREMENT(ptr) _MD_ATOMIC_ADD(ptr, -1)
 229
 230 static inline PRInt32 _MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 n)
 231 {
 232     PRInt32 ov, nv;
 233     volatile PRInt32 *vp = ptr;
 234
 235     do {
 236         ov = *vp;
 237         nv = ov + n;
 238     } while (__kernel_cmpxchg(ov, nv, vp));
 239
 240     return nv;
 241 }
 242
 243 static inline PRInt32 _MD_ATOMIC_SET(PRInt32 *ptr, PRInt32 nv)
 244 {
 245     PRInt32 ov;
 246     volatile PRInt32 *vp = ptr;
 247
 248     do {
 249         ov = *vp;
 250     } while (__kernel_cmpxchg(ov, nv, vp));
 251
 252     return ov;
 253 }
 254 #endif
 255
 256 #define USE_SETJMP
 257 #if defined(__GLIBC__) && __GLIBC__ >= 2
 258 #define _PR_POLL_AVAILABLE
 259 #endif
 260 #undef _PR_USE_POLL
 261 #define _PR_STAT_HAS_ONLY_ST_ATIME
 262 #if defined(__alpha) || defined(__ia64__)
 263 #define _PR_HAVE_LARGE_OFF_T
 264 #elif (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 265 #define _PR_HAVE_OFF64_T
 266 #else
 267 #define _PR_NO_LARGE_FILES
 268 #endif
 269 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 270 #define _PR_INET6
 271 #define _PR_HAVE_INET_NTOP
 272 #define _PR_HAVE_GETHOSTBYNAME2
 273 #define _PR_HAVE_GETADDRINFO
 274 #define _PR_INET6_PROBE
 275 #endif
 276 #define _PR_HAVE_SYSV_SEMAPHORES
 277 #define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
 278 #if (__GLIBC__ >= 2) && defined(_PR_PTHREADS)
 279 #define _PR_HAVE_GETHOST_R
 280 #define _PR_HAVE_GETHOST_R_INT
 281 #endif
 282
 283 #ifdef _PR_PTHREADS
 284
 285 extern void _MD_CleanupBeforeExit(void);
 286 #define _MD_CLEANUP_BEFORE_EXIT _MD_CleanupBeforeExit
 287
 288 #else  /* ! _PR_PTHREADS */
 289
 290 #include <setjmp.h>
 291
 292 #define PR_CONTEXT_TYPE sigjmp_buf
 293
 294 #define CONTEXT(_th) ((_th)->md.context)
 295
 296 #ifdef __powerpc__
 297 /*
 298  * PowerPC based MkLinux
 299  *
 300  * On the PowerPC, the new style jmp_buf isn't used until glibc
 301  * 2.1.
 302  */
 303 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 304 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_GPR1]
 305 #else
 306 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__misc[0]
 307 #endif /* glibc 2.1 or later */
 308 #define _MD_SET_FP(_t, val)
 309 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 310 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 311 /* aix = 64, macos = 70 */
 312 #define PR_NUM_GCREGS  64
 313
 314 #elif defined(__alpha)
 315 /* Alpha based Linux */
 316
 317 #if defined(__GLIBC__) && __GLIBC__ >= 2
 318 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 319 #define _MD_SET_FP(_t, val)
 320 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 321 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 322 #define _MD_SP_TYPE long int
 323 #else
 324 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 325 #define _MD_SET_FP(_t, val)
 326 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 327 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 328 #define _MD_SP_TYPE __ptr_t
 329 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 330
 331 /* XXX not sure if this is correct, or maybe it should be 17? */
 332 #define PR_NUM_GCREGS 9
 333
 334 #elif defined(__ia64__)
 335
 336 #define _MD_GET_SP(_t)      ((long *)((_t)->md.context[0].__jmpbuf)[0])
 337 #define _MD_SET_FP(_t, val)
 338 #define _MD_GET_SP_PTR(_t)  &(_MD_GET_SP(_t))
 339 #define _MD_GET_FP_PTR(_t)  ((void *) 0)
 340 #define _MD_SP_TYPE         long int
 341
 342 #define PR_NUM_GCREGS       _JBLEN
 343
 344 #elif defined(__mc68000__)
 345 /* m68k based Linux */
 346
 347 /*
 348  * On the m68k, glibc still uses the old style sigjmp_buf, even
 349  * in glibc 2.0.7.
 350  */
 351 #if defined(__GLIBC__) && __GLIBC__ >= 2
 352 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 353 #define _MD_SET_FP(_t, val)
 354 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 355 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 356 #define _MD_SP_TYPE int
 357 #else
 358 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 359 #define _MD_SET_FP(_t, val)
 360 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 361 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 362 #define _MD_SP_TYPE __ptr_t
 363 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 364
 365 /* XXX not sure if this is correct, or maybe it should be 17? */
 366 #define PR_NUM_GCREGS 9
 367
 368 #elif defined(__sparc__)
 369 /* Sparc */
 370 #if defined(__GLIBC__) && __GLIBC__ >= 2
 371 /*
 372  * You need glibc2-2.0.7-25 or later. The libraries that came with
 373  * Red Hat 5.1 are not new enough, but they are in 5.2.
 374  */
 375 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 376 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_FP] = val)
 377 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 378 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_FP])
 379 #define _MD_SP_TYPE int
 380 #else
 381 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__fp
 382 #define _MD_SET_FP(_t, val)
 383 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 384 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 385 #define _MD_SP_TYPE __ptr_t
 386 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 387
 388 #elif defined(__i386__)
 389 /* Intel based Linux */
 390 #if defined(__GLIBC__) && __GLIBC__ >= 2
 391 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 392 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_BP] = val)
 393 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 394 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_BP])
 395 #define _MD_SP_TYPE int
 396 #else
 397 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 398 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__bp = val)
 399 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 400 #define _MD_GET_FP_PTR(_t) &((_t)->md.context[0].__jmpbuf[0].__bp)
 401 #define _MD_SP_TYPE __ptr_t
 402 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 403 #define PR_NUM_GCREGS   6
 404
 405 #elif defined(__mips__)
 406 /* Linux/MIPS */
 407 #if defined(__GLIBC__) && __GLIBC__ >= 2
 408 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 409 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__fp = (val))
 410 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 411 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[0].__fp)
 412 #define _MD_SP_TYPE __ptr_t
 413 #else
 414 #error "Linux/MIPS pre-glibc2 not supported yet"
 415 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 416
 417 #elif defined(__arm__)
 418 /* ARM/Linux */
 419 #if defined(__GLIBC__) && __GLIBC__ >= 2
 420 #ifdef __ARM_EABI__
 421 /* EABI */
 422 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[8]
 423 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[7] = (val))
 424 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 425 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[7])
 426 #define _MD_SP_TYPE __ptr_t
 427 #else /* __ARM_EABI__ */
 428 /* old ABI */
 429 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[20]
 430 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[19] = (val))
 431 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 432 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[19])
 433 #define _MD_SP_TYPE __ptr_t
 434 #endif /* __ARM_EABI__ */
 435 #else
 436 #error "ARM/Linux pre-glibc2 not supported yet"
 437 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 438
 439 #else
 440
 441 #error "Unknown CPU architecture"
 442
 443 #endif /*__powerpc__*/
 444
 445 /*
 446 ** Initialize a thread context to run "_main()" when started
 447 */
 448 #ifdef __powerpc__
 449
 450 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 451 {  \
 452     *status = PR_TRUE;  \
 453     if (sigsetjmp(CONTEXT(_thread), 1)) {  \
 454         _main();  \
 455     }  \
 456     _MD_GET_SP(_thread) = (unsigned char*) ((_sp) - 128); \
 457     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
 458     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
 459     _MD_SET_FP(_thread, 0); \
 460 }
 461
 462 #elif defined(__mips__)
 463
 464 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 465 {  \
 466     *status = PR_TRUE;  \
 467     (void) sigsetjmp(CONTEXT(_thread), 1);  \
 468     _thread->md.context[0].__jmpbuf[0].__pc = (__ptr_t) _main;  \
 469     _MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
 470     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
 471     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
 472     _MD_SET_FP(_thread, 0); \
 473 }
 474
 475 #else
 476
 477 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 478 {  \
 479     *status = PR_TRUE;  \
 480     if (sigsetjmp(CONTEXT(_thread), 1)) {  \
 481         _main();  \
 482     }  \
 483     _MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
 484     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
 485     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
 486     _MD_SET_FP(_thread, 0); \
 487 }
 488
 489 #endif /*__powerpc__*/
 490
 491 #define _MD_SWITCH_CONTEXT(_thread)  \
 492     if (!sigsetjmp(CONTEXT(_thread), 1)) {  \
 493         (_thread)->md.errcode = errno;  \
 494         _PR_Schedule();  \
 495     }
 496
 497 /*
 498 ** Restore a thread context, saved by _MD_SWITCH_CONTEXT
 499 */
 500 #define _MD_RESTORE_CONTEXT(_thread) \
 501 {   \
 502     errno = (_thread)->md.errcode;  \
 503     _MD_SET_CURRENT_THREAD(_thread);  \
 504     siglongjmp(CONTEXT(_thread), 1);  \
 505 }
 506
 507 /* Machine-dependent (MD) data structures */
 508
 509 struct _MDThread {
 510     PR_CONTEXT_TYPE context;
 511     void *sp;
 512     void *fp;
 513     int id;
 514     int errcode;
 515 };
 516
 517 struct _MDThreadStack {
 518     PRInt8 notused;
 519 };
 520
 521 struct _MDLock {
 522     PRInt8 notused;
 523 };
 524
 525 struct _MDSemaphore {
 526     PRInt8 notused;
 527 };
 528
 529 struct _MDCVar {
 530     PRInt8 notused;
 531 };
 532
 533 struct _MDSegment {
 534     PRInt8 notused;
 535 };
 536
 537 /*
 538  * md-specific cpu structure field
 539  */
 540 #include <sys/time.h>  /* for FD_SETSIZE */
 541 #define _PR_MD_MAX_OSFD FD_SETSIZE
 542
 543 struct _MDCPU_Unix {
 544     PRCList ioQ;
 545     PRUint32 ioq_timeout;
 546     PRInt32 ioq_max_osfd;
 547     PRInt32 ioq_osfd_cnt;
 548 #ifndef _PR_USE_POLL
 549     fd_set fd_read_set, fd_write_set, fd_exception_set;
 550     PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD],fd_write_cnt[_PR_MD_MAX_OSFD],
 551             fd_exception_cnt[_PR_MD_MAX_OSFD];
 552 #else
 553     struct pollfd *ioq_pollfds;
 554     int ioq_pollfds_size;
 555 #endif  /* _PR_USE_POLL */
 556 };
 557
 558 #define _PR_IOQ(_cpu)                   ((_cpu)->md.md_unix.ioQ)
 559 #define _PR_ADD_TO_IOQ(_pq, _cpu) PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
 560 #define _PR_FD_READ_SET(_cpu)           ((_cpu)->md.md_unix.fd_read_set)
 561 #define _PR_FD_READ_CNT(_cpu)           ((_cpu)->md.md_unix.fd_read_cnt)
 562 #define _PR_FD_WRITE_SET(_cpu)          ((_cpu)->md.md_unix.fd_write_set)
 563 #define _PR_FD_WRITE_CNT(_cpu)          ((_cpu)->md.md_unix.fd_write_cnt)
 564 #define _PR_FD_EXCEPTION_SET(_cpu)      ((_cpu)->md.md_unix.fd_exception_set)
 565 #define _PR_FD_EXCEPTION_CNT(_cpu)      ((_cpu)->md.md_unix.fd_exception_cnt)
 566 #define _PR_IOQ_TIMEOUT(_cpu)           ((_cpu)->md.md_unix.ioq_timeout)
 567 #define _PR_IOQ_MAX_OSFD(_cpu)          ((_cpu)->md.md_unix.ioq_max_osfd)
 568 #define _PR_IOQ_OSFD_CNT(_cpu)          ((_cpu)->md.md_unix.ioq_osfd_cnt)
 569 #define _PR_IOQ_POLLFDS(_cpu)           ((_cpu)->md.md_unix.ioq_pollfds)
 570 #define _PR_IOQ_POLLFDS_SIZE(_cpu)      ((_cpu)->md.md_unix.ioq_pollfds_size)
 571
 572 #define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu)  32
 573
 574 struct _MDCPU {
 575     struct _MDCPU_Unix md_unix;
 576 };
 577
 578 #define _MD_INIT_LOCKS()
 579 #define _MD_NEW_LOCK(lock) PR_SUCCESS
 580 #define _MD_FREE_LOCK(lock)
 581 #define _MD_LOCK(lock)
 582 #define _MD_UNLOCK(lock)
 583 #define _MD_INIT_IO()
 584 #define _MD_IOQ_LOCK()
 585 #define _MD_IOQ_UNLOCK()
 586
 587 extern PRStatus _MD_InitializeThread(PRThread *thread);
 588
 589 #define _MD_INIT_RUNNING_CPU(cpu)       _MD_unix_init_running_cpu(cpu)
 590 #define _MD_INIT_THREAD                 _MD_InitializeThread
 591 #define _MD_EXIT_THREAD(thread)
 592 #define _MD_SUSPEND_THREAD(thread)      _MD_suspend_thread
 593 #define _MD_RESUME_THREAD(thread)       _MD_resume_thread
 594 #define _MD_CLEAN_THREAD(_thread)
 595
 596 extern PRStatus _MD_CREATE_THREAD(
 597     PRThread *thread,
 598     void (*start) (void *),
 599     PRThreadPriority priority,
 600     PRThreadScope scope,
 601     PRThreadState state,
 602     PRUint32 stackSize);
 603 extern void _MD_SET_PRIORITY(struct _MDThread *thread, PRUintn newPri);
 604 extern PRStatus _MD_WAIT(PRThread *, PRIntervalTime timeout);
 605 extern PRStatus _MD_WAKEUP_WAITER(PRThread *);
 606 extern void _MD_YIELD(void);
 607
 608 #endif /* ! _PR_PTHREADS */
 609
 610 extern void _MD_EarlyInit(void);
 611 extern PRIntervalTime _PR_UNIX_GetInterval(void);
 612 extern PRIntervalTime _PR_UNIX_TicksPerSecond(void);
 613
 614 #define _MD_EARLY_INIT                  _MD_EarlyInit
 615 #define _MD_FINAL_INIT                  _PR_UnixInit
 616 #define _MD_GET_INTERVAL                _PR_UNIX_GetInterval
 617 #define _MD_INTERVAL_PER_SEC            _PR_UNIX_TicksPerSecond
 618
 619 /*
 620  * We wrapped the select() call.  _MD_SELECT refers to the built-in,
 621  * unwrapped version.
 622  */
 623 #define _MD_SELECT __select
 624
 625 #ifdef _PR_POLL_AVAILABLE
 626 #include <sys/poll.h>
 627 extern int __syscall_poll(struct pollfd *ufds, unsigned long int nfds,
 628         int timeout);
 629 #define _MD_POLL __syscall_poll
 630 #endif
 631
 632 /* For writev() */
 633 #include <sys/uio.h>
 634
 635 extern void _MD_linux_map_sendfile_error(int err);
 636
 637 #endif /* nspr_linux_defs_h___ */