$NetBSD: patch-aa,v 1.15 2018/09/14 15:53:46 tnn Exp $

DragonFly support.
Add workaround for missing  sem_timedwait() in NetBSD < 6.99.4
Workaround incomplete libc/no alloca(3) on NetBSD/aarch64

--- hotspot/src/os/bsd/vm/os_bsd.cpp.orig	2017-08-13 05:55:27.000000000 +0000
+++ hotspot/src/os/bsd/vm/os_bsd.cpp
@@ -22,6 +22,11 @@
  *
  */
 
+#if defined(__NetBSD__) && defined(__aarch64__)
+// there is no alloca(3) yet on this port
+#define alloca(size) __builtin_alloca(size)
+#endif
+
 // no precompiled headers
 #include "classfile/classLoader.hpp"
 #include "classfile/systemDictionary.hpp"
@@ -126,7 +131,7 @@
 # include <inttypes.h>
 # include <sys/ioctl.h>
 
-#if defined(__FreeBSD__) || defined(__NetBSD__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 # include <elf.h>
 #endif
 
@@ -327,6 +332,7 @@ void os::Bsd::initialize_system_info() {
   size_t len;
   int cpu_val;
   julong mem_val;
+  struct rlimit limits;
 
   /* get processors count via hw.ncpus sysctl */
   mib[0] = CTL_HW;
@@ -359,14 +365,11 @@ void os::Bsd::initialize_system_info() {
        _physical_memory = 256*1024*1024;       // fallback (XXXBSD?)
   }
 
-#ifdef __OpenBSD__
-  {
-       // limit _physical_memory memory view on OpenBSD since
-       // datasize rlimit restricts us anyway.
-       struct rlimit limits;
-       getrlimit(RLIMIT_DATA, &limits);
-       _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
-  }
+  getrlimit(RLIMIT_DATA, &limits);
+  _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
+#if defined(RLIMIT_AS)
+  getrlimit(RLIMIT_AS, &limits);
+  _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
 #endif
 }
 #else
@@ -445,7 +448,7 @@ void os::init_system_properties_values()
  *        7: The default directories, normally /lib and /usr/lib.
  */
 #ifndef DEFAULT_LIBPATH
-#define DEFAULT_LIBPATH "/lib:/usr/lib"
+#define DEFAULT_LIBPATH "@PREFIX@/lib/jni:@PREFIX@/lib:/lib:/usr/lib"
 #endif
 
 #define EXTENSIONS_DIR  "/lib/ext"
@@ -2227,9 +2230,16 @@ void * os::dll_load(const char *filename
     {EM_SPARCV9,     EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
     {EM_PPC,         EM_PPC,     ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
     {EM_PPC64,       EM_PPC64,   ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
+#if defined(EM_AARCH64)
+    {EM_AARCH64,     EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"Aarch64"},
+#endif
     {EM_ARM,         EM_ARM,     ELFCLASS32,   ELFDATA2LSB, (char*)"ARM"},
+#if defined(EM_S390)
     {EM_S390,        EM_S390,    ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
+#endif
+#if defined(EM_ALPHA)
     {EM_ALPHA,       EM_ALPHA,   ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
+#endif
     {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
     {EM_MIPS,        EM_MIPS,    ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
     {EM_PARISC,      EM_PARISC,  ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
@@ -2252,6 +2262,8 @@ void * os::dll_load(const char *filename
     static  Elf32_Half running_arch_code=EM_PPC;
   #elif  (defined ARM)
     static  Elf32_Half running_arch_code=EM_ARM;
+  #elif  (defined AARCH64)
+    static  Elf32_Half running_arch_code=EM_AARCH64;
   #elif  (defined S390)
     static  Elf32_Half running_arch_code=EM_S390;
   #elif  (defined ALPHA)
@@ -2825,6 +2837,33 @@ bool Semaphore::timedwait(unsigned int s
 
 #else
 
+#if defined(__NetBSD__) && (__NetBSD_Version__ < 699000400)
+static inline int sem_timedwait(sem_t *sem, struct timespec *ts) {
+  struct timespec onems = { 0, 1000000 };
+  struct timespec total = { 0, 0 };
+  struct timespec unslept;
+  struct timespec elapsed;
+  struct timespec tmp;
+
+  while (timespeccmp(ts, &total, >)) {
+    if (sem_trywait(sem) == 0)
+      return 0;
+
+    if (errno != EAGAIN)
+      return -1;
+
+    (void)nanosleep(&onems, &unslept);
+
+    timespecsub(&onems, &unslept, &elapsed);
+    timespecadd(&total, &elapsed, &tmp);
+    total.tv_sec = tmp.tv_sec;
+    total.tv_nsec = tmp.tv_nsec;
+  }
+  errno = ETIMEDOUT;
+  return -1;
+}
+#endif /* __NetBSD__ */
+
 bool Semaphore::trywait() {
   return sem_trywait(&_semaphore) == 0;
 }
@@ -2975,7 +3014,7 @@ static void warn_fail_commit_memory(char
 //       problem.
 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
   int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
-#ifdef __OpenBSD__
+#if defined(__OpenBSD__) || defined(__NetBSD__)
   // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
   if (::mprotect(addr, size, prot) == 0) {
     return true;
@@ -3901,7 +3940,7 @@ OSReturn os::set_native_priority(Thread*
 #ifdef __OpenBSD__
   // OpenBSD pthread_setprio starves low priority threads
   return OS_OK;
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
   int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
   return (ret == 0) ? OS_OK : OS_ERR;
 #elif defined(__APPLE__) || defined(__NetBSD__)
@@ -3930,7 +3969,7 @@ OSReturn os::get_native_priority(const T
   }
 
   errno = 0;
-#if defined(__OpenBSD__) || defined(__FreeBSD__)
+#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
   *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
 #elif defined(__APPLE__) || defined(__NetBSD__)
   int policy;