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path: root/recipes/openjdk/openjdk-6/shark-arm-linux-cpu-detection.patch
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Index: icedtea6-1.8/ports/hotspot/src/share/vm/shark/sharkCompiler.cpp
===================================================================
--- icedtea6-1.8.orig/ports/hotspot/src/share/vm/shark/sharkCompiler.cpp	2010-07-14 16:42:48.412103129 +0200
+++ icedtea6-1.8/ports/hotspot/src/share/vm/shark/sharkCompiler.cpp	2010-07-14 16:50:51.680282178 +0200
@@ -32,6 +32,96 @@
 
 #if SHARK_LLVM_VERSION >= 27
 namespace {
+
+#if defined(__arm__) && defined(__linux__)
+#include <fcntl.h>
+#include <linux/auxvec.h>
+#include <asm/hwcap.h>
+#define VECBUFF_SIZE 32
+
+bool TestARMLinuxHWCAP(int feature) {
+  int fd;
+  unsigned vecs[VECBUFF_SIZE];
+  unsigned *p;
+  int i, n;
+  int rc;
+
+  rc = 0;
+  fd = open("/proc/self/auxv", O_RDONLY);
+  if (fd < 0) return 0;
+  do {
+    n = read(fd, vecs, VECBUFF_SIZE * sizeof(unsigned));
+    p = vecs;
+    i = n/8;
+    while (--i >=0) {
+      unsigned tag = *p++;
+      unsigned value = *p++;
+      if (tag == 0) goto fini;
+      if(tag == AT_HWCAP && (value & feature)) {
+        rc = 1;
+        goto fini;
+      }
+    }
+  } while (n == VECBUFF_SIZE * sizeof(unsigned));
+fini:
+  close(fd);
+  return rc;
+}
+
+char* TestARMLinuxAT(int auxvec) {
+  int fd;
+  unsigned vecs[VECBUFF_SIZE];
+  unsigned *p;
+  int i, n;
+  char* rc;
+
+  rc = 0;
+  fd = open("/proc/self/auxv", O_RDONLY);
+  if (fd < 0) return 0;
+  do {
+    n = read(fd, vecs, VECBUFF_SIZE * sizeof(unsigned));
+    p = vecs;
+    i = n/8;
+    while (--i >=0) {
+      unsigned tag = *p++;
+      unsigned value = *p++;
+      if (tag == 0) goto fini;
+      if(tag == (unsigned) auxvec ) {
+        rc = (char*)value;
+        goto fini;
+      }
+    }
+  } while (n == VECBUFF_SIZE * sizeof(unsigned));
+fini:
+  close(fd);
+  return rc;
+}
+
+bool getARMHostCPUFeatures(StringMap<bool> &Features) {
+  // FIXME LLVM PR6561 // Features["neon"]=TestARMLinuxHWCAP(HWCAP_NEON);
+  Features["thumb2"]=TestARMLinuxHWCAP(HWCAP_THUMBEE);
+  Features["vfp2"]=TestARMLinuxHWCAP(HWCAP_VFP);
+
+  std::string testArchKey(TestARMLinuxAT(AT_PLATFORM));
+
+  StringMap<std::string> archLinuxToLLVMMap;
+  archLinuxToLLVMMap["v4l"]="v4t";
+  archLinuxToLLVMMap["v5l"]="v5t";
+  archLinuxToLLVMMap["v6l"]="v6";
+  // FIXME change this from v6 to v7a when LLVM PR7048 have been fixed
+  archLinuxToLLVMMap["v7l"]="v6";
+
+  llvm::StringMapIterator<std::string> resultIterator(archLinuxToLLVMMap.find(
+                                                      testArchKey));
+  if(resultIterator->first()) {
+    std::string arch(resultIterator->second);
+    Features[arch]=true;
+  }
+
+  return true;
+}
+#endif
+
   cl::opt<std::string>
   MCPU("mcpu");
 
@@ -64,7 +154,11 @@
 #if SHARK_LLVM_VERSION >= 27
   // Finetune LLVM for the current host CPU.
   StringMap<bool> Features;
+#if defined(__arm__) && defined(__linux__)
+  bool gotCpuFeatures = getARMHostCPUFeatures(Features);
+#else
   bool gotCpuFeatures = llvm::sys::getHostCPUFeatures(Features);
+#endif
   std::string cpu("-mcpu=" + llvm::sys::getHostCPUName());
 
   std::vector<const char*> args;