nspr-4.8.6/mozilla/nsprpub/pr/include/md/_linux.h - nest-learning-thermostat/5.1.5/nspr - Git at Google

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  * for the specific language governing rights and limitations under the
  * License.
  *
  * The Original Code is the Netscape Portable Runtime (NSPR).
  *
  * The Initial Developer of the Original Code is
  * Netscape Communications Corporation.
  * Portions created by the Initial Developer are Copyright (C) 1998-2000
  * the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  * in which case the provisions of the GPL or the LGPL are applicable instead
  * of those above. If you wish to allow use of your version of this file only
  * under the terms of either the GPL or the LGPL, and not to allow others to
  * use your version of this file under the terms of the MPL, indicate your
  * decision by deleting the provisions above and replace them with the notice
  * and other provisions required by the GPL or the LGPL. If you do not delete
  * the provisions above, a recipient may use your version of this file under
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */

 /*
  * This file is used by not only Linux but also other glibc systems
  * such as GNU/Hurd and GNU/k*BSD.
  */

 #ifndef nspr_linux_defs_h___
 #define nspr_linux_defs_h___

 #include "prthread.h"

 /*
  * Internal configuration macros
  */

 #define PR_LINKER_ARCH	"linux"
 #define _PR_SI_SYSNAME  "LINUX"
 #ifdef __powerpc64__
 #define _PR_SI_ARCHITECTURE "ppc64"
 #elif defined(__powerpc__)
 #define _PR_SI_ARCHITECTURE "ppc"
 #elif defined(__alpha)
 #define _PR_SI_ARCHITECTURE "alpha"
 #elif defined(__ia64__)
 #define _PR_SI_ARCHITECTURE "ia64"
 #elif defined(__x86_64__)
 #define _PR_SI_ARCHITECTURE "x86-64"
 #elif defined(__mc68000__)
 #define _PR_SI_ARCHITECTURE "m68k"
 #elif defined(__sparc__) && defined(__arch64__)
 #define _PR_SI_ARCHITECTURE "sparc64"
 #elif defined(__sparc__)
 #define _PR_SI_ARCHITECTURE "sparc"
 #elif defined(__i386__)
 #define _PR_SI_ARCHITECTURE "x86"
 #elif defined(__mips__)
 #define _PR_SI_ARCHITECTURE "mips"
 #elif defined(__arm__)
 #define _PR_SI_ARCHITECTURE "arm"
 #elif defined(__hppa__)
 #define _PR_SI_ARCHITECTURE "hppa"
 #elif defined(__s390x__)
 #define _PR_SI_ARCHITECTURE "s390x"
 #elif defined(__s390__)
 #define _PR_SI_ARCHITECTURE "s390"
 #elif defined(__sh__)
 #define _PR_SI_ARCHITECTURE "sh"
 #elif defined(__avr32__)
 #define _PR_SI_ARCHITECTURE "avr32"
 #else
 #error "Unknown CPU architecture"
 #endif
 #define PR_DLL_SUFFIX		".so"

 #define _PR_VMBASE              0x30000000
 #define _PR_STACK_VMBASE	0x50000000
 #define _MD_DEFAULT_STACK_SIZE	65536L
 #define _MD_MMAP_FLAGS          MAP_PRIVATE

 #undef	HAVE_STACK_GROWING_UP

 /*
  * Elf linux supports dl* functions
  */
 #define HAVE_DLL
 #define USE_DLFCN
 #if defined(ANDROID)
 #define NO_DLOPEN_NULL
 #endif

 #ifdef __FreeBSD_kernel__
 #define _PR_HAVE_SOCKADDR_LEN
 #endif

 #if defined(__i386__)
 #define _PR_HAVE_ATOMIC_OPS
 #define _MD_INIT_ATOMIC()
 extern PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val);
 #define _MD_ATOMIC_INCREMENT          _PR_x86_AtomicIncrement
 extern PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val);
 #define _MD_ATOMIC_DECREMENT          _PR_x86_AtomicDecrement
 extern PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 #define _MD_ATOMIC_ADD                _PR_x86_AtomicAdd
 extern PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
 #define _MD_ATOMIC_SET                _PR_x86_AtomicSet
 #endif

 #if defined(__ia64__)
 #define _PR_HAVE_ATOMIC_OPS
 #define _MD_INIT_ATOMIC()
 extern PRInt32 _PR_ia64_AtomicIncrement(PRInt32 *val);
 #define _MD_ATOMIC_INCREMENT          _PR_ia64_AtomicIncrement
 extern PRInt32 _PR_ia64_AtomicDecrement(PRInt32 *val);
 #define _MD_ATOMIC_DECREMENT          _PR_ia64_AtomicDecrement
 extern PRInt32 _PR_ia64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 #define _MD_ATOMIC_ADD                _PR_ia64_AtomicAdd
 extern PRInt32 _PR_ia64_AtomicSet(PRInt32 *val, PRInt32 newval);
 #define _MD_ATOMIC_SET                _PR_ia64_AtomicSet
 #endif

 #if defined(__x86_64__)
 #define _PR_HAVE_ATOMIC_OPS
 #define _MD_INIT_ATOMIC()
 extern PRInt32 _PR_x86_64_AtomicIncrement(PRInt32 *val);
 #define _MD_ATOMIC_INCREMENT          _PR_x86_64_AtomicIncrement
 extern PRInt32 _PR_x86_64_AtomicDecrement(PRInt32 *val);
 #define _MD_ATOMIC_DECREMENT          _PR_x86_64_AtomicDecrement
 extern PRInt32 _PR_x86_64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 #define _MD_ATOMIC_ADD                _PR_x86_64_AtomicAdd
 extern PRInt32 _PR_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval);
 #define _MD_ATOMIC_SET                _PR_x86_64_AtomicSet
 #endif

 #if defined(__powerpc__) && !defined(__powerpc64__)
 #define _PR_HAVE_ATOMIC_OPS
 #define _MD_INIT_ATOMIC()
 extern PRInt32 _PR_ppc_AtomicIncrement(PRInt32 *val);
 #define _MD_ATOMIC_INCREMENT          _PR_ppc_AtomicIncrement
 extern PRInt32 _PR_ppc_AtomicDecrement(PRInt32 *val);
 #define _MD_ATOMIC_DECREMENT          _PR_ppc_AtomicDecrement
 extern PRInt32 _PR_ppc_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 #define _MD_ATOMIC_ADD                _PR_ppc_AtomicAdd
 extern PRInt32 _PR_ppc_AtomicSet(PRInt32 *val, PRInt32 newval);
 #define _MD_ATOMIC_SET                _PR_ppc_AtomicSet
 #endif

 #if defined(__alpha)
 #define _PR_HAVE_ATOMIC_OPS
 #define _MD_INIT_ATOMIC()
 #define _MD_ATOMIC_ADD(ptr, i) ({               \
     PRInt32 __atomic_tmp, __atomic_ret;   \
     __asm__ __volatile__(                       \
     "1: ldl_l   %[ret], %[val]          \n"     \
     "   addl    %[ret], %[inc], %[tmp]  \n"     \
     "   addl    %[ret], %[inc], %[ret]  \n"     \
     "   stl_c   %[tmp], %[val]          \n"     \
     "   beq     %[tmp], 2f              \n"     \
     ".subsection 2                      \n"     \
     "2: br      1b                      \n"     \
     ".previous"                                 \
     : [ret] "=&r" (__atomic_ret),               \
       [tmp] "=&r" (__atomic_tmp),               \
       [val] "=m" (*ptr)                         \
     : [inc] "Ir" (i), "m" (*ptr));              \
     __atomic_ret;                               \
 })
 #define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
 #define _MD_ATOMIC_DECREMENT(ptr) ({            \
     PRInt32 __atomic_tmp, __atomic_ret;   \
     __asm__ __volatile__(                       \
     "1: ldl_l   %[ret], %[val]          \n"     \
     "   subl    %[ret], 1, %[tmp]       \n"     \
     "   subl    %[ret], 1, %[ret]       \n"     \
     "   stl_c   %[tmp], %[val]          \n"     \
     "   beq     %[tmp], 2f              \n"     \
     ".subsection 2                      \n"     \
     "2: br      1b                      \n"     \
     ".previous"                                 \
     : [ret] "=&r" (__atomic_ret),               \
       [tmp] "=&r" (__atomic_tmp),               \
       [val] "=m" (*ptr)                         \
     : "m" (*ptr));                              \
     __atomic_ret;                               \
 })
 #define _MD_ATOMIC_SET(ptr, n) ({               \
     PRInt32 __atomic_tmp, __atomic_ret;   \
     __asm__ __volatile__(                       \
     "1: ldl_l   %[ret], %[val]          \n"     \
     "   mov     %[newval], %[tmp]       \n"     \
     "   stl_c   %[tmp], %[val]          \n"     \
     "   beq     %[tmp], 2f              \n"     \
     ".subsection 2                      \n"     \
     "2: br      1b                      \n"     \
     ".previous"                                 \
     : [ret] "=&r" (__atomic_ret),               \
       [tmp] "=&r"(__atomic_tmp),                \
       [val] "=m" (*ptr)                         \
     : [newval] "Ir" (n), "m" (*ptr));           \
     __atomic_ret;                               \
 })
 #endif

 #if defined(__arm__) && defined(_PR_ARM_KUSER)
 #define _PR_HAVE_ATOMIC_OPS
 #define _MD_INIT_ATOMIC()

 /*
  * The kernel provides this helper function at a fixed address with a fixed
  * ABI signature, directly callable from user space.
  *
  * Definition:
  * Atomically store newval in *ptr if *ptr is equal to oldval.
  * Return zero if *ptr was changed or non-zero if no exchange happened.
  */
 typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr);
 #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)

 #define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
 #define _MD_ATOMIC_DECREMENT(ptr) _MD_ATOMIC_ADD(ptr, -1)

 static inline PRInt32 _MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 n)
 {
     PRInt32 ov, nv;
     volatile PRInt32 *vp = ptr;

     do {
         ov = *vp;
         nv = ov + n;
     } while (__kernel_cmpxchg(ov, nv, vp));

     return nv;
 }

 static inline PRInt32 _MD_ATOMIC_SET(PRInt32 *ptr, PRInt32 nv)
 {
     PRInt32 ov;
     volatile PRInt32 *vp = ptr;

     do {
         ov = *vp;
     } while (__kernel_cmpxchg(ov, nv, vp));

     return ov;
 }
 #endif

 #define USE_SETJMP
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _PR_POLL_AVAILABLE
 #endif
 #undef _PR_USE_POLL
 #define _PR_STAT_HAS_ONLY_ST_ATIME
 #if defined(__alpha) || defined(__ia64__)
 #define _PR_HAVE_LARGE_OFF_T
 #elif (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 #define _PR_HAVE_OFF64_T
 #else
 #define _PR_NO_LARGE_FILES
 #endif
 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 #define _PR_INET6
 #define _PR_HAVE_INET_NTOP
 #define _PR_HAVE_GETHOSTBYNAME2
 #define _PR_HAVE_GETADDRINFO
 #define _PR_INET6_PROBE
 #endif
 #ifndef ANDROID
 #define _PR_HAVE_SYSV_SEMAPHORES
 #define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
 #endif
 #if (__GLIBC__ >= 2) && defined(_PR_PTHREADS)
 #define _PR_HAVE_GETHOST_R
 #define _PR_HAVE_GETHOST_R_INT
 #endif

 #ifdef _PR_PTHREADS

 extern void _MD_CleanupBeforeExit(void);
 #define _MD_CLEANUP_BEFORE_EXIT _MD_CleanupBeforeExit

 #else  /* ! _PR_PTHREADS */

 #include <setjmp.h>

 #define PR_CONTEXT_TYPE	sigjmp_buf

 #define CONTEXT(_th) ((_th)->md.context)

 #ifdef __powerpc__
 /*
  * PowerPC based MkLinux
  *
  * On the PowerPC, the new style jmp_buf isn't used until glibc
  * 2.1.
  */
 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_GPR1]
 #else
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__misc[0]
 #endif /* glibc 2.1 or later */
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 /* aix = 64, macos = 70 */
 #define PR_NUM_GCREGS  64

 #elif defined(__alpha)
 /* Alpha based Linux */

 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 #define _MD_SP_TYPE long int
 #else
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 #define _MD_SP_TYPE __ptr_t
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

 /* XXX not sure if this is correct, or maybe it should be 17? */
 #define PR_NUM_GCREGS 9

 #elif defined(__ia64__)

 #define _MD_GET_SP(_t)      ((long *)((_t)->md.context[0].__jmpbuf)[0])
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t)  &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t)  ((void *) 0)
 #define _MD_SP_TYPE         long int

 #define PR_NUM_GCREGS       _JBLEN

 #elif defined(__mc68000__)
 /* m68k based Linux */

 /*
  * On the m68k, glibc still uses the old style sigjmp_buf, even
  * in glibc 2.0.7.
  */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 #define _MD_SP_TYPE int
 #else
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 #define _MD_SP_TYPE __ptr_t
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

 /* XXX not sure if this is correct, or maybe it should be 17? */
 #define PR_NUM_GCREGS 9

 #elif defined(__sparc__)
 /* Sparc */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 /*
  * You need glibc2-2.0.7-25 or later. The libraries that came with
  * Red Hat 5.1 are not new enough, but they are in 5.2.
  */
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_FP] = val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_FP])
 #define _MD_SP_TYPE int
 #else
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__fp
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 #define _MD_SP_TYPE __ptr_t
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

 #elif defined(__i386__)
 /* Intel based Linux */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_BP] = val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_BP])
 #define _MD_SP_TYPE int
 #else
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__bp = val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) &((_t)->md.context[0].__jmpbuf[0].__bp)
 #define _MD_SP_TYPE __ptr_t
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 #define PR_NUM_GCREGS   6

 #elif defined(__mips__)
 /* Linux/MIPS */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__fp = (val))
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[0].__fp)
 #define _MD_SP_TYPE __ptr_t
 #else
 #error "Linux/MIPS pre-glibc2 not supported yet"
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

 #elif defined(__arm__)
 /* ARM/Linux */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #ifdef __ARM_EABI__
 /* EABI */
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[8]
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[7] = (val))
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[7])
 #define _MD_SP_TYPE __ptr_t
 #else /* __ARM_EABI__ */
 /* old ABI */
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[20]
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[19] = (val))
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[19])
 #define _MD_SP_TYPE __ptr_t
 #endif /* __ARM_EABI__ */
 #else
 #error "ARM/Linux pre-glibc2 not supported yet"
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

 #elif defined(__sh__)
 /* SH/Linux */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[7]
 #define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[6] = (val))
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[6])
 #define _MD_SP_TYPE __ptr_t
 #else
 #error "SH/Linux pre-glibc2 not supported yet"
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

 #else

 #error "Unknown CPU architecture"

 #endif /*__powerpc__*/

 /*
 ** Initialize a thread context to run "_main()" when started
 */
 #ifdef __powerpc__

 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 {  \
     *status = PR_TRUE;  \
     if (sigsetjmp(CONTEXT(_thread), 1)) {  \
         _main();  \
     }  \
     _MD_GET_SP(_thread) = (unsigned char*) ((_sp) - 128); \
     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
     _MD_SET_FP(_thread, 0); \
 }

 #elif defined(__mips__)

 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 {  \
     *status = PR_TRUE;  \
     (void) sigsetjmp(CONTEXT(_thread), 1);  \
     _thread->md.context[0].__jmpbuf[0].__pc = (__ptr_t) _main;  \
     _MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
     _MD_SET_FP(_thread, 0); \
 }

 #else

 #define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
 {  \
     *status = PR_TRUE;  \
     if (sigsetjmp(CONTEXT(_thread), 1)) {  \
         _main();  \
     }  \
     _MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
     _thread->md.sp = _MD_GET_SP_PTR(_thread); \
     _thread->md.fp = _MD_GET_FP_PTR(_thread); \
     _MD_SET_FP(_thread, 0); \
 }

 #endif /*__powerpc__*/

 #define _MD_SWITCH_CONTEXT(_thread)  \
     if (!sigsetjmp(CONTEXT(_thread), 1)) {  \
 	(_thread)->md.errcode = errno;  \
 	_PR_Schedule();  \
     }

 /*
 ** Restore a thread context, saved by _MD_SWITCH_CONTEXT
 */
 #define _MD_RESTORE_CONTEXT(_thread) \
 {   \
     errno = (_thread)->md.errcode;  \
     _MD_SET_CURRENT_THREAD(_thread);  \
     siglongjmp(CONTEXT(_thread), 1);  \
 }

 /* Machine-dependent (MD) data structures */

 struct _MDThread {
     PR_CONTEXT_TYPE context;
     void *sp;
     void *fp;
     int id;
     int errcode;
 };

 struct _MDThreadStack {
     PRInt8 notused;
 };

 struct _MDLock {
     PRInt8 notused;
 };

 struct _MDSemaphore {
     PRInt8 notused;
 };

 struct _MDCVar {
     PRInt8 notused;
 };

 struct _MDSegment {
     PRInt8 notused;
 };

 /*
  * md-specific cpu structure field
  */
 #include <sys/time.h>  /* for FD_SETSIZE */
 #define _PR_MD_MAX_OSFD FD_SETSIZE

 struct _MDCPU_Unix {
     PRCList ioQ;
     PRUint32 ioq_timeout;
     PRInt32 ioq_max_osfd;
     PRInt32 ioq_osfd_cnt;
 #ifndef _PR_USE_POLL
     fd_set fd_read_set, fd_write_set, fd_exception_set;
     PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD],fd_write_cnt[_PR_MD_MAX_OSFD],
             fd_exception_cnt[_PR_MD_MAX_OSFD];
 #else
     struct pollfd *ioq_pollfds;
     int ioq_pollfds_size;
 #endif	/* _PR_USE_POLL */
 };

 #define _PR_IOQ(_cpu)			((_cpu)->md.md_unix.ioQ)
 #define _PR_ADD_TO_IOQ(_pq, _cpu) PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
 #define _PR_FD_READ_SET(_cpu)		((_cpu)->md.md_unix.fd_read_set)
 #define _PR_FD_READ_CNT(_cpu)		((_cpu)->md.md_unix.fd_read_cnt)
 #define _PR_FD_WRITE_SET(_cpu)		((_cpu)->md.md_unix.fd_write_set)
 #define _PR_FD_WRITE_CNT(_cpu)		((_cpu)->md.md_unix.fd_write_cnt)
 #define _PR_FD_EXCEPTION_SET(_cpu)	((_cpu)->md.md_unix.fd_exception_set)
 #define _PR_FD_EXCEPTION_CNT(_cpu)	((_cpu)->md.md_unix.fd_exception_cnt)
 #define _PR_IOQ_TIMEOUT(_cpu)		((_cpu)->md.md_unix.ioq_timeout)
 #define _PR_IOQ_MAX_OSFD(_cpu)		((_cpu)->md.md_unix.ioq_max_osfd)
 #define _PR_IOQ_OSFD_CNT(_cpu)		((_cpu)->md.md_unix.ioq_osfd_cnt)
 #define _PR_IOQ_POLLFDS(_cpu)		((_cpu)->md.md_unix.ioq_pollfds)
 #define _PR_IOQ_POLLFDS_SIZE(_cpu)	((_cpu)->md.md_unix.ioq_pollfds_size)

 #define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu)	32

 struct _MDCPU {
     struct _MDCPU_Unix md_unix;
 };

 #define _MD_INIT_LOCKS()
 #define _MD_NEW_LOCK(lock) PR_SUCCESS
 #define _MD_FREE_LOCK(lock)
 #define _MD_LOCK(lock)
 #define _MD_UNLOCK(lock)
 #define _MD_INIT_IO()
 #define _MD_IOQ_LOCK()
 #define _MD_IOQ_UNLOCK()

 extern PRStatus _MD_InitializeThread(PRThread *thread);

 #define _MD_INIT_RUNNING_CPU(cpu)       _MD_unix_init_running_cpu(cpu)
 #define _MD_INIT_THREAD                 _MD_InitializeThread
 #define _MD_EXIT_THREAD(thread)
 #define _MD_SUSPEND_THREAD(thread)      _MD_suspend_thread
 #define _MD_RESUME_THREAD(thread)       _MD_resume_thread
 #define _MD_CLEAN_THREAD(_thread)

 extern PRStatus _MD_CREATE_THREAD(
     PRThread *thread,
     void (*start) (void *),
     PRThreadPriority priority,
     PRThreadScope scope,
     PRThreadState state,
     PRUint32 stackSize);
 extern void _MD_SET_PRIORITY(struct _MDThread *thread, PRUintn newPri);
 extern PRStatus _MD_WAIT(PRThread *, PRIntervalTime timeout);
 extern PRStatus _MD_WAKEUP_WAITER(PRThread *);
 extern void _MD_YIELD(void);

 #endif /* ! _PR_PTHREADS */

 extern void _MD_EarlyInit(void);
 extern PRIntervalTime _PR_UNIX_GetInterval(void);
 extern PRIntervalTime _PR_UNIX_TicksPerSecond(void);

 #define _MD_EARLY_INIT                  _MD_EarlyInit
 #define _MD_FINAL_INIT                  _PR_UnixInit
 #define _MD_GET_INTERVAL                _PR_UNIX_GetInterval
 #define _MD_INTERVAL_PER_SEC            _PR_UNIX_TicksPerSecond

 /*
  * We wrapped the select() call.  _MD_SELECT refers to the built-in,
  * unwrapped version.
  */
 #define _MD_SELECT __select

 #ifdef _PR_POLL_AVAILABLE
 #include <sys/poll.h>
 extern int __syscall_poll(struct pollfd *ufds, unsigned long int nfds,
 	int timeout);
 #define _MD_POLL __syscall_poll
 #endif

 /* For writev() */
 #include <sys/uio.h>

 extern void _MD_linux_map_sendfile_error(int err);

 #endif /* nspr_linux_defs_h___ */
	/* -- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -- */
	/* *** BEGIN LICENSE BLOCK ***
	* Version: MPL 1.1/GPL 2.0/LGPL 2.1
	*
	* The contents of this file are subject to the Mozilla Public License Version
	* 1.1 (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	* http://www.mozilla.org/MPL/
	*
	* Software distributed under the License is distributed on an "AS IS" basis,
	* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
	* for the specific language governing rights and limitations under the
	* License.
	*
	* The Original Code is the Netscape Portable Runtime (NSPR).
	*
	* The Initial Developer of the Original Code is
	* Netscape Communications Corporation.
	* Portions created by the Initial Developer are Copyright (C) 1998-2000
	* the Initial Developer. All Rights Reserved.
	*
	* Contributor(s):
	*
	* Alternatively, the contents of this file may be used under the terms of
	* either the GNU General Public License Version 2 or later (the "GPL"), or
	* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
	* in which case the provisions of the GPL or the LGPL are applicable instead
	* of those above. If you wish to allow use of your version of this file only
	* under the terms of either the GPL or the LGPL, and not to allow others to
	* use your version of this file under the terms of the MPL, indicate your
	* decision by deleting the provisions above and replace them with the notice
	* and other provisions required by the GPL or the LGPL. If you do not delete
	* the provisions above, a recipient may use your version of this file under
	* the terms of any one of the MPL, the GPL or the LGPL.
	*
	* *** END LICENSE BLOCK *** */

	/*
	* This file is used by not only Linux but also other glibc systems
	* such as GNU/Hurd and GNU/k*BSD.
	*/

	#ifndef nspr_linux_defs_h___
	#define nspr_linux_defs_h___

	#include "prthread.h"

	/*
	* Internal configuration macros
	*/

	#define PR_LINKER_ARCH "linux"
	#define _PR_SI_SYSNAME "LINUX"
	#ifdef __powerpc64__
	#define _PR_SI_ARCHITECTURE "ppc64"
	#elif defined(__powerpc__)
	#define _PR_SI_ARCHITECTURE "ppc"
	#elif defined(__alpha)
	#define _PR_SI_ARCHITECTURE "alpha"
	#elif defined(__ia64__)
	#define _PR_SI_ARCHITECTURE "ia64"
	#elif defined(__x86_64__)
	#define _PR_SI_ARCHITECTURE "x86-64"
	#elif defined(__mc68000__)
	#define _PR_SI_ARCHITECTURE "m68k"
	#elif defined(__sparc__) && defined(__arch64__)
	#define _PR_SI_ARCHITECTURE "sparc64"
	#elif defined(__sparc__)
	#define _PR_SI_ARCHITECTURE "sparc"
	#elif defined(__i386__)
	#define _PR_SI_ARCHITECTURE "x86"
	#elif defined(__mips__)
	#define _PR_SI_ARCHITECTURE "mips"
	#elif defined(__arm__)
	#define _PR_SI_ARCHITECTURE "arm"
	#elif defined(__hppa__)
	#define _PR_SI_ARCHITECTURE "hppa"
	#elif defined(__s390x__)
	#define _PR_SI_ARCHITECTURE "s390x"
	#elif defined(__s390__)
	#define _PR_SI_ARCHITECTURE "s390"
	#elif defined(__sh__)
	#define _PR_SI_ARCHITECTURE "sh"
	#elif defined(__avr32__)
	#define _PR_SI_ARCHITECTURE "avr32"
	#else
	#error "Unknown CPU architecture"
	#endif
	#define PR_DLL_SUFFIX ".so"

	#define _PR_VMBASE 0x30000000
	#define _PR_STACK_VMBASE 0x50000000
	#define _MD_DEFAULT_STACK_SIZE 65536L
	#define _MD_MMAP_FLAGS MAP_PRIVATE

	#undef HAVE_STACK_GROWING_UP

	/*
	* Elf linux supports dl* functions
	*/
	#define HAVE_DLL
	#define USE_DLFCN
	#if defined(ANDROID)
	#define NO_DLOPEN_NULL
	#endif

	#ifdef __FreeBSD_kernel__
	#define _PR_HAVE_SOCKADDR_LEN
	#endif

	#if defined(__i386__)
	#define _PR_HAVE_ATOMIC_OPS
	#define _MD_INIT_ATOMIC()
	extern PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val);
	#define _MD_ATOMIC_INCREMENT _PR_x86_AtomicIncrement
	extern PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val);
	#define _MD_ATOMIC_DECREMENT _PR_x86_AtomicDecrement
	extern PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val);
	#define _MD_ATOMIC_ADD _PR_x86_AtomicAdd
	extern PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
	#define _MD_ATOMIC_SET _PR_x86_AtomicSet
	#endif

	#if defined(__ia64__)
	#define _PR_HAVE_ATOMIC_OPS
	#define _MD_INIT_ATOMIC()
	extern PRInt32 _PR_ia64_AtomicIncrement(PRInt32 *val);
	#define _MD_ATOMIC_INCREMENT _PR_ia64_AtomicIncrement
	extern PRInt32 _PR_ia64_AtomicDecrement(PRInt32 *val);
	#define _MD_ATOMIC_DECREMENT _PR_ia64_AtomicDecrement
	extern PRInt32 _PR_ia64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
	#define _MD_ATOMIC_ADD _PR_ia64_AtomicAdd
	extern PRInt32 _PR_ia64_AtomicSet(PRInt32 *val, PRInt32 newval);
	#define _MD_ATOMIC_SET _PR_ia64_AtomicSet
	#endif

	#if defined(__x86_64__)
	#define _PR_HAVE_ATOMIC_OPS
	#define _MD_INIT_ATOMIC()
	extern PRInt32 _PR_x86_64_AtomicIncrement(PRInt32 *val);
	#define _MD_ATOMIC_INCREMENT _PR_x86_64_AtomicIncrement
	extern PRInt32 _PR_x86_64_AtomicDecrement(PRInt32 *val);
	#define _MD_ATOMIC_DECREMENT _PR_x86_64_AtomicDecrement
	extern PRInt32 _PR_x86_64_AtomicAdd(PRInt32 *ptr, PRInt32 val);
	#define _MD_ATOMIC_ADD _PR_x86_64_AtomicAdd
	extern PRInt32 _PR_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval);
	#define _MD_ATOMIC_SET _PR_x86_64_AtomicSet
	#endif

	#if defined(__powerpc__) && !defined(__powerpc64__)
	#define _PR_HAVE_ATOMIC_OPS
	#define _MD_INIT_ATOMIC()
	extern PRInt32 _PR_ppc_AtomicIncrement(PRInt32 *val);
	#define _MD_ATOMIC_INCREMENT _PR_ppc_AtomicIncrement
	extern PRInt32 _PR_ppc_AtomicDecrement(PRInt32 *val);
	#define _MD_ATOMIC_DECREMENT _PR_ppc_AtomicDecrement
	extern PRInt32 _PR_ppc_AtomicAdd(PRInt32 *ptr, PRInt32 val);
	#define _MD_ATOMIC_ADD _PR_ppc_AtomicAdd
	extern PRInt32 _PR_ppc_AtomicSet(PRInt32 *val, PRInt32 newval);
	#define _MD_ATOMIC_SET _PR_ppc_AtomicSet
	#endif

	#if defined(__alpha)
	#define _PR_HAVE_ATOMIC_OPS
	#define _MD_INIT_ATOMIC()
	#define _MD_ATOMIC_ADD(ptr, i) ({ \
	PRInt32 __atomic_tmp, __atomic_ret; \
	__asm__ __volatile__( \
	"1: ldl_l %[ret], %[val] \n" \
	" addl %[ret], %[inc], %[tmp] \n" \
	" addl %[ret], %[inc], %[ret] \n" \
	" stl_c %[tmp], %[val] \n" \
	" beq %[tmp], 2f \n" \
	".subsection 2 \n" \
	"2: br 1b \n" \
	".previous" \
	: [ret] "=&r" (__atomic_ret), \
	[tmp] "=&r" (__atomic_tmp), \
	[val] "=m" (*ptr) \
	: [inc] "Ir" (i), "m" (*ptr)); \
	__atomic_ret; \
	})
	#define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
	#define _MD_ATOMIC_DECREMENT(ptr) ({ \
	PRInt32 __atomic_tmp, __atomic_ret; \
	__asm__ __volatile__( \
	"1: ldl_l %[ret], %[val] \n" \
	" subl %[ret], 1, %[tmp] \n" \
	" subl %[ret], 1, %[ret] \n" \
	" stl_c %[tmp], %[val] \n" \
	" beq %[tmp], 2f \n" \
	".subsection 2 \n" \
	"2: br 1b \n" \
	".previous" \
	: [ret] "=&r" (__atomic_ret), \
	[tmp] "=&r" (__atomic_tmp), \
	[val] "=m" (*ptr) \
	: "m" (*ptr)); \
	__atomic_ret; \
	})
	#define _MD_ATOMIC_SET(ptr, n) ({ \
	PRInt32 __atomic_tmp, __atomic_ret; \
	__asm__ __volatile__( \
	"1: ldl_l %[ret], %[val] \n" \
	" mov %[newval], %[tmp] \n" \
	" stl_c %[tmp], %[val] \n" \
	" beq %[tmp], 2f \n" \
	".subsection 2 \n" \
	"2: br 1b \n" \
	".previous" \
	: [ret] "=&r" (__atomic_ret), \
	[tmp] "=&r"(__atomic_tmp), \
	[val] "=m" (*ptr) \
	: [newval] "Ir" (n), "m" (*ptr)); \
	__atomic_ret; \
	})
	#endif

	#if defined(__arm__) && defined(_PR_ARM_KUSER)
	#define _PR_HAVE_ATOMIC_OPS
	#define _MD_INIT_ATOMIC()

	/*
	* The kernel provides this helper function at a fixed address with a fixed
	* ABI signature, directly callable from user space.
	*
	* Definition:
	* Atomically store newval in ptr if ptr is equal to oldval.
	* Return zero if *ptr was changed or non-zero if no exchange happened.
	*/
	typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr);
	#define __kernel_cmpxchg ((__kernel_cmpxchg_t )0xffff0fc0)

	#define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
	#define _MD_ATOMIC_DECREMENT(ptr) _MD_ATOMIC_ADD(ptr, -1)

	static inline PRInt32 _MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 n)
	{
	PRInt32 ov, nv;
	volatile PRInt32 *vp = ptr;

	do {
	ov = *vp;
	nv = ov + n;
	} while (__kernel_cmpxchg(ov, nv, vp));

	return nv;
	}

	static inline PRInt32 _MD_ATOMIC_SET(PRInt32 *ptr, PRInt32 nv)
	{
	PRInt32 ov;
	volatile PRInt32 *vp = ptr;

	do {
	ov = *vp;
	} while (__kernel_cmpxchg(ov, nv, vp));

	return ov;
	}
	#endif

	#define USE_SETJMP
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#define _PR_POLL_AVAILABLE
	#endif
	#undef _PR_USE_POLL
	#define _PR_STAT_HAS_ONLY_ST_ATIME
	#if defined(__alpha) \|\| defined(__ia64__)
	#define _PR_HAVE_LARGE_OFF_T
	#elif (__GLIBC__ > 2) \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
	#define _PR_HAVE_OFF64_T
	#else
	#define _PR_NO_LARGE_FILES
	#endif
	#if (__GLIBC__ > 2) \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
	#define _PR_INET6
	#define _PR_HAVE_INET_NTOP
	#define _PR_HAVE_GETHOSTBYNAME2
	#define _PR_HAVE_GETADDRINFO
	#define _PR_INET6_PROBE
	#endif
	#ifndef ANDROID
	#define _PR_HAVE_SYSV_SEMAPHORES
	#define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
	#endif
	#if (__GLIBC__ >= 2) && defined(_PR_PTHREADS)
	#define _PR_HAVE_GETHOST_R
	#define _PR_HAVE_GETHOST_R_INT
	#endif

	#ifdef _PR_PTHREADS

	extern void _MD_CleanupBeforeExit(void);
	#define _MD_CLEANUP_BEFORE_EXIT _MD_CleanupBeforeExit

	#else /* ! _PR_PTHREADS */

	#include <setjmp.h>

	#define PR_CONTEXT_TYPE sigjmp_buf

	#define CONTEXT(_th) ((_th)->md.context)

	#ifdef __powerpc__
	/*
	* PowerPC based MkLinux
	*
	* On the PowerPC, the new style jmp_buf isn't used until glibc
	* 2.1.
	*/
	#if (__GLIBC__ > 2) \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_GPR1]
	#else
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__misc[0]
	#endif /* glibc 2.1 or later */
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	/* aix = 64, macos = 70 */
	#define PR_NUM_GCREGS 64

	#elif defined(__alpha)
	/* Alpha based Linux */

	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	#define _MD_SP_TYPE long int
	#else
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	#define _MD_SP_TYPE __ptr_t
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

	/* XXX not sure if this is correct, or maybe it should be 17? */
	#define PR_NUM_GCREGS 9

	#elif defined(__ia64__)

	#define _MD_GET_SP(_t) ((long *)((_t)->md.context[0].__jmpbuf)[0])
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	#define _MD_SP_TYPE long int

	#define PR_NUM_GCREGS _JBLEN

	#elif defined(__mc68000__)
	/* m68k based Linux */

	/*
	* On the m68k, glibc still uses the old style sigjmp_buf, even
	* in glibc 2.0.7.
	*/
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	#define _MD_SP_TYPE int
	#else
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	#define _MD_SP_TYPE __ptr_t
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

	/* XXX not sure if this is correct, or maybe it should be 17? */
	#define PR_NUM_GCREGS 9

	#elif defined(__sparc__)
	/* Sparc */
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	/*
	* You need glibc2-2.0.7-25 or later. The libraries that came with
	* Red Hat 5.1 are not new enough, but they are in 5.2.
	*/
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_FP] = val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_FP])
	#define _MD_SP_TYPE int
	#else
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__fp
	#define _MD_SET_FP(_t, val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) ((void *) 0)
	#define _MD_SP_TYPE __ptr_t
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

	#elif defined(__i386__)
	/* Intel based Linux */
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_BP] = val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_BP])
	#define _MD_SP_TYPE int
	#else
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__bp = val)
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) &((_t)->md.context[0].__jmpbuf[0].__bp)
	#define _MD_SP_TYPE __ptr_t
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
	#define PR_NUM_GCREGS 6

	#elif defined(__mips__)
	/* Linux/MIPS */
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__sp
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__fp = (val))
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[0].__fp)
	#define _MD_SP_TYPE __ptr_t
	#else
	#error "Linux/MIPS pre-glibc2 not supported yet"
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

	#elif defined(__arm__)
	/* ARM/Linux */
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#ifdef __ARM_EABI__
	/* EABI */
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[8]
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[7] = (val))
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[7])
	#define _MD_SP_TYPE __ptr_t
	#else /* __ARM_EABI__ */
	/* old ABI */
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[20]
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[19] = (val))
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[19])
	#define _MD_SP_TYPE __ptr_t
	#endif /* __ARM_EABI__ */
	#else
	#error "ARM/Linux pre-glibc2 not supported yet"
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

	#elif defined(__sh__)
	/* SH/Linux */
	#if defined(__GLIBC__) && __GLIBC__ >= 2
	#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[7]
	#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[6] = (val))
	#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
	#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[6])
	#define _MD_SP_TYPE __ptr_t
	#else
	#error "SH/Linux pre-glibc2 not supported yet"
	#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

	#else

	#error "Unknown CPU architecture"

	#endif /__powerpc__/

	/*
	** Initialize a thread context to run "_main()" when started
	*/
	#ifdef __powerpc__

	#define _MD_INIT_CONTEXT(_thread, _sp, _main, status) \
	{ \
	*status = PR_TRUE; \
	if (sigsetjmp(CONTEXT(_thread), 1)) { \
	_main(); \
	} \
	_MD_GET_SP(_thread) = (unsigned char*) ((_sp) - 128); \
	_thread->md.sp = _MD_GET_SP_PTR(_thread); \
	_thread->md.fp = _MD_GET_FP_PTR(_thread); \
	_MD_SET_FP(_thread, 0); \
	}

	#elif defined(__mips__)

	#define _MD_INIT_CONTEXT(_thread, _sp, _main, status) \
	{ \
	*status = PR_TRUE; \
	(void) sigsetjmp(CONTEXT(_thread), 1); \
	_thread->md.context[0].__jmpbuf[0].__pc = (__ptr_t) _main; \
	_MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
	_thread->md.sp = _MD_GET_SP_PTR(_thread); \
	_thread->md.fp = _MD_GET_FP_PTR(_thread); \
	_MD_SET_FP(_thread, 0); \
	}

	#else

	#define _MD_INIT_CONTEXT(_thread, _sp, _main, status) \
	{ \
	*status = PR_TRUE; \
	if (sigsetjmp(CONTEXT(_thread), 1)) { \
	_main(); \
	} \
	_MD_GET_SP(_thread) = (_MD_SP_TYPE) ((_sp) - 64); \
	_thread->md.sp = _MD_GET_SP_PTR(_thread); \
	_thread->md.fp = _MD_GET_FP_PTR(_thread); \
	_MD_SET_FP(_thread, 0); \
	}

	#endif /__powerpc__/

	#define _MD_SWITCH_CONTEXT(_thread) \
	if (!sigsetjmp(CONTEXT(_thread), 1)) { \
	(_thread)->md.errcode = errno; \
	_PR_Schedule(); \
	}

	/*
	** Restore a thread context, saved by _MD_SWITCH_CONTEXT
	*/
	#define _MD_RESTORE_CONTEXT(_thread) \
	{ \
	errno = (_thread)->md.errcode; \
	_MD_SET_CURRENT_THREAD(_thread); \
	siglongjmp(CONTEXT(_thread), 1); \
	}

	/* Machine-dependent (MD) data structures */

	struct _MDThread {
	PR_CONTEXT_TYPE context;
	void *sp;
	void *fp;
	int id;
	int errcode;
	};

	struct _MDThreadStack {
	PRInt8 notused;
	};

	struct _MDLock {
	PRInt8 notused;
	};

	struct _MDSemaphore {
	PRInt8 notused;
	};

	struct _MDCVar {
	PRInt8 notused;
	};

	struct _MDSegment {
	PRInt8 notused;
	};

	/*
	* md-specific cpu structure field
	*/
	#include <sys/time.h> /* for FD_SETSIZE */
	#define _PR_MD_MAX_OSFD FD_SETSIZE

	struct _MDCPU_Unix {
	PRCList ioQ;
	PRUint32 ioq_timeout;
	PRInt32 ioq_max_osfd;
	PRInt32 ioq_osfd_cnt;
	#ifndef _PR_USE_POLL
	fd_set fd_read_set, fd_write_set, fd_exception_set;
	PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD],fd_write_cnt[_PR_MD_MAX_OSFD],
	fd_exception_cnt[_PR_MD_MAX_OSFD];
	#else
	struct pollfd *ioq_pollfds;
	int ioq_pollfds_size;
	#endif /* _PR_USE_POLL */
	};

	#define _PR_IOQ(_cpu) ((_cpu)->md.md_unix.ioQ)
	#define _PR_ADD_TO_IOQ(_pq, _cpu) PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
	#define _PR_FD_READ_SET(_cpu) ((_cpu)->md.md_unix.fd_read_set)
	#define _PR_FD_READ_CNT(_cpu) ((_cpu)->md.md_unix.fd_read_cnt)
	#define _PR_FD_WRITE_SET(_cpu) ((_cpu)->md.md_unix.fd_write_set)
	#define _PR_FD_WRITE_CNT(_cpu) ((_cpu)->md.md_unix.fd_write_cnt)
	#define _PR_FD_EXCEPTION_SET(_cpu) ((_cpu)->md.md_unix.fd_exception_set)
	#define _PR_FD_EXCEPTION_CNT(_cpu) ((_cpu)->md.md_unix.fd_exception_cnt)
	#define _PR_IOQ_TIMEOUT(_cpu) ((_cpu)->md.md_unix.ioq_timeout)
	#define _PR_IOQ_MAX_OSFD(_cpu) ((_cpu)->md.md_unix.ioq_max_osfd)
	#define _PR_IOQ_OSFD_CNT(_cpu) ((_cpu)->md.md_unix.ioq_osfd_cnt)
	#define _PR_IOQ_POLLFDS(_cpu) ((_cpu)->md.md_unix.ioq_pollfds)
	#define _PR_IOQ_POLLFDS_SIZE(_cpu) ((_cpu)->md.md_unix.ioq_pollfds_size)

	#define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu) 32

	struct _MDCPU {
	struct _MDCPU_Unix md_unix;
	};

	#define _MD_INIT_LOCKS()
	#define _MD_NEW_LOCK(lock) PR_SUCCESS
	#define _MD_FREE_LOCK(lock)
	#define _MD_LOCK(lock)
	#define _MD_UNLOCK(lock)
	#define _MD_INIT_IO()
	#define _MD_IOQ_LOCK()
	#define _MD_IOQ_UNLOCK()

	extern PRStatus _MD_InitializeThread(PRThread *thread);

	#define _MD_INIT_RUNNING_CPU(cpu) _MD_unix_init_running_cpu(cpu)
	#define _MD_INIT_THREAD _MD_InitializeThread
	#define _MD_EXIT_THREAD(thread)
	#define _MD_SUSPEND_THREAD(thread) _MD_suspend_thread
	#define _MD_RESUME_THREAD(thread) _MD_resume_thread
	#define _MD_CLEAN_THREAD(_thread)

	extern PRStatus _MD_CREATE_THREAD(
	PRThread *thread,
	void (start) (void ),
	PRThreadPriority priority,
	PRThreadScope scope,
	PRThreadState state,
	PRUint32 stackSize);
	extern void _MD_SET_PRIORITY(struct _MDThread *thread, PRUintn newPri);
	extern PRStatus _MD_WAIT(PRThread *, PRIntervalTime timeout);
	extern PRStatus _MD_WAKEUP_WAITER(PRThread *);
	extern void _MD_YIELD(void);

	#endif /* ! _PR_PTHREADS */

	extern void _MD_EarlyInit(void);
	extern PRIntervalTime _PR_UNIX_GetInterval(void);
	extern PRIntervalTime _PR_UNIX_TicksPerSecond(void);

	#define _MD_EARLY_INIT _MD_EarlyInit
	#define _MD_FINAL_INIT _PR_UnixInit
	#define _MD_GET_INTERVAL _PR_UNIX_GetInterval
	#define _MD_INTERVAL_PER_SEC _PR_UNIX_TicksPerSecond

	/*
	* We wrapped the select() call. _MD_SELECT refers to the built-in,
	* unwrapped version.
	*/
	#define _MD_SELECT __select

	#ifdef _PR_POLL_AVAILABLE
	#include <sys/poll.h>
	extern int __syscall_poll(struct pollfd *ufds, unsigned long int nfds,
	int timeout);
	#define _MD_POLL __syscall_poll
	#endif

	/* For writev() */
	#include <sys/uio.h>

	extern void _MD_linux_map_sendfile_error(int err);

	#endif /* nspr_linux_defs_h___ */