--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/pr/include/md/_linux.h	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,658 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * 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(__aarch64__)
+#define _PR_SI_ARCHITECTURE "aarch64"
+#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"
+#elif defined(__m32r__)
+#define _PR_SI_ARCHITECTURE "m32r"
+#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
+
+#if defined(__aarch64__)
+#define _MD_MINIMUM_STACK_SIZE  0x20000
+#endif
+
+#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(__aarch64__)
+#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
+/* Use GCC built-in functions */
+#define _PR_HAVE_ATOMIC_OPS
+#define _MD_INIT_ATOMIC()
+
+#define _MD_ATOMIC_INCREMENT(ptr) __sync_add_and_fetch(ptr, 1)
+#define _MD_ATOMIC_DECREMENT(ptr) __sync_sub_and_fetch(ptr, 1)
+#define _MD_ATOMIC_SET(ptr, nv) __sync_lock_test_and_set(ptr, nv)
+#define _MD_ATOMIC_ADD(ptr, i) __sync_add_and_fetch(ptr, i)
+
+#elif 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
+#endif /* __arm__ */
+
+#define USE_SETJMP
+#if (defined(__GLIBC__) && __GLIBC__ >= 2) || defined(ANDROID)
+#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) \
+    || defined(ANDROID)
+#define _PR_HAVE_OFF64_T
+#else
+#define _PR_NO_LARGE_FILES
+#endif
+#if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) \
+    || defined(ANDROID)
+#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
+/* Android has gethostbyname_r but not gethostbyaddr_r or gethostbyname2_r. */
+#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 */
+
+#elif defined(__m32r__)
+/* Linux/M32R */
+#if defined(__GLIBC__) && __GLIBC__ >= 2
+#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__regs[JB_SP]
+#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[0].__regs[JB_FP] = (val))
+#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
+#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[0].__regs[JB_FP])
+#define _MD_SP_TYPE __ptr_t
+#else
+#error "Linux/M32R 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);
+
+#define _MD_EARLY_INIT                  _MD_EarlyInit
+#define _MD_FINAL_INIT                  _PR_UnixInit
+#define HAVE_CLOCK_MONOTONIC
+
+/*
+ * 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___ */