diff --git a/hermit/usr/xray/LICENSE b/hermit/usr/xray/LICENSE
new file mode 100644
index 000000000..29b40573f
--- /dev/null
+++ b/hermit/usr/xray/LICENSE
@@ -0,0 +1,28 @@
+Copyright 2011, The Chromium Authors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+    * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/hermit/usr/xray/browser.c b/hermit/usr/xray/browser.c
new file mode 100644
index 000000000..a150c5a3f
--- /dev/null
+++ b/hermit/usr/xray/browser.c
@@ -0,0 +1,163 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+/* XRay -- a simple profiler for Native Client */
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+
+#include <alloca.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "ppapi/c/dev/ppb_trace_event_dev.h"
+#include "xray/xray_priv.h"
+
+
+#if defined(XRAY)
+static PPB_Trace_Event_Dev* ppb_trace_event_interface = NULL;
+
+static const char* XRayGetName(struct XRaySymbolTable* symbols,
+      struct XRayTraceBufferEntry* e) {
+  uint32_t addr = XRAY_EXTRACT_ADDR(e->depth_addr);
+  struct XRaySymbol* symbol = XRaySymbolTableLookup(symbols, addr);
+  return XRaySymbolGetName(symbol);
+}
+
+struct XRayTimestampPair XRayGenerateTimestampsNow(void) {
+  struct XRayTimestampPair pair;
+  assert(ppb_trace_event_interface);
+
+  XRayGetTSC(&pair.xray);
+  pair.pepper = ppb_trace_event_interface->Now();
+  return pair;
+}
+
+/* see chromium/src/base/trace_event/trace_event.h */
+#define TRACE_VALUE_TYPE_UINT (2)
+#define TRACE_VALUE_TYPE_DOUBLE (4)
+#define TRACE_VALUE_TYPE_COPY_STRING (7)
+
+union TraceValue {
+    bool as_bool;
+    unsigned long long as_uint;
+    long long as_int;
+    double as_double;
+    const void* as_pointer;
+    const char* as_string;
+  };
+
+void XRayBrowserTraceReport(struct XRayTraceCapture* capture) {
+
+  const void* cat_enabled = ppb_trace_event_interface->GetCategoryEnabled(
+      "xray");
+  struct XRaySymbolTable* symbols = XRayGetSymbolTable(capture);
+
+  int32_t thread_id = XRayGetSavedThreadID(capture);
+
+  int head = XRayFrameGetHead(capture);
+  int frame = XRayFrameGetTail(capture);
+  while(frame != head) {
+
+    struct XRayTimestampPair start_time = XRayFrameGetStartTimestampPair(
+        capture, frame);
+    struct XRayTimestampPair end_time = XRayFrameGetEndTimestampPair(
+        capture, frame);
+
+    double pdiff = (end_time.pepper - start_time.pepper);
+    double odiff = (end_time.xray - start_time.xray);
+    double scale_a = pdiff / odiff;
+    double scale_b = ((double)end_time.pepper) - (scale_a * end_time.xray);
+    printf("Xray timestamp calibration frame %d: %f %f\n",
+        frame, scale_a, scale_b);
+
+    int start = XRayFrameGetTraceStartIndex(capture, frame);
+    int end = XRayFrameGetTraceEndIndex(capture, frame);
+
+    struct XRayTraceBufferEntry** stack_base = XRayMalloc(
+      sizeof(struct XRayTraceBufferEntry*) * (XRAY_TRACE_STACK_SIZE + 1));
+    struct XRayTraceBufferEntry** stack_top = stack_base;
+    *stack_top = NULL;
+
+    uint32_t num_args = 0;
+    const char* arg_names[] = {"annotation"};
+    uint8_t arg_types[] = {TRACE_VALUE_TYPE_COPY_STRING};
+    uint64_t arg_values[] = {0};
+    char annotation[XRAY_TRACE_ANNOTATION_LENGTH];
+
+    int i;
+    for(i = start; i != end; i = XRayTraceNextEntry(capture, i)) {
+      if (XRayTraceIsAnnotation(capture, i)) {
+        continue;
+      }
+
+      uint32_t depth = XRAY_EXTRACT_DEPTH(
+          XRayTraceGetEntry(capture, i)->depth_addr);
+
+      while(*stack_top &&
+          XRAY_EXTRACT_DEPTH((*stack_top)->depth_addr) >= depth) {
+        struct XRayTraceBufferEntry* e = *(stack_top--);
+        ppb_trace_event_interface->AddTraceEventWithThreadIdAndTimestamp(
+            'E', cat_enabled,
+            XRayGetName(symbols, e),
+            0, thread_id,
+            (scale_a * e->end_tick) + scale_b,
+            0, NULL, NULL, NULL, 0
+        );
+      }
+
+      num_args = 0;
+      struct XRayTraceBufferEntry* e = XRayTraceGetEntry(capture, i);
+      uint32_t annotation_index = e->annotation_index;
+      if (annotation_index) {
+        XRayTraceCopyToString(capture, annotation_index, annotation);
+
+        union TraceValue val;
+        val.as_string = (const char*)annotation;
+
+        arg_values[0] = val.as_uint;
+        num_args = 1;
+      }
+
+      ppb_trace_event_interface->AddTraceEventWithThreadIdAndTimestamp(
+          'B', cat_enabled,
+          XRayGetName(symbols, e),
+          0, thread_id,
+          (scale_a * e->start_tick) + scale_b,
+          num_args, arg_names, arg_types, arg_values, 0
+      );
+
+      *(++stack_top) = e;
+    }
+
+    while(*stack_top) {
+      struct XRayTraceBufferEntry* e = *(stack_top--);
+      ppb_trace_event_interface->AddTraceEventWithThreadIdAndTimestamp(
+          'E', cat_enabled,
+          XRayGetName(symbols, e),
+          0, thread_id,
+          (scale_a * e->end_tick) + scale_b,
+          0, NULL, NULL, NULL, 0
+      );
+    }
+
+    frame = XRayFrameGetNext(capture, frame);
+    XRayFree(stack_base);
+  }
+}
+
+void XRayRegisterBrowserInterface(PPB_GetInterface interface) {
+  ppb_trace_event_interface = (PPB_Trace_Event_Dev*)interface(
+      PPB_TRACE_EVENT_DEV_INTERFACE);
+  assert(ppb_trace_event_interface);
+}
+
+#endif  /* XRAY */
+#endif  /* XRAY_DISABLE_BROWSER_INTEGRATION */
\ No newline at end of file
diff --git a/hermit/usr/xray/demangle.c b/hermit/usr/xray/demangle.c
new file mode 100644
index 000000000..cf3cbc43d
--- /dev/null
+++ b/hermit/usr/xray/demangle.c
@@ -0,0 +1,25 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+#include "xray/xray_priv.h"
+
+/* Note name demangling requires linking against libstdc++                 */
+/* If your platform does not support __cxa_demangle, re-compile XRay with: */
+/*   -DXRAY_NO_DEMANGLE                                                    */
+
+#if !defined(XRAY_NO_DEMANGLE)
+extern
+char* __cxa_demangle(const char* __mangled_name, char* __output_buffer,
+                     size_t* __length, int* __status);
+#endif
+
+const char* XRayDemangle(char* demangle, size_t size, const char* symbol) {
+#if !defined(XRAY_NO_DEMANGLE)
+  int stat;
+  __cxa_demangle(symbol, demangle, &size, &stat);
+  if (stat == 0)
+    return demangle;
+#endif
+  return symbol;
+}
diff --git a/hermit/usr/xray/hashtable.c b/hermit/usr/xray/hashtable.c
new file mode 100644
index 000000000..45f2aa21c
--- /dev/null
+++ b/hermit/usr/xray/hashtable.c
@@ -0,0 +1,205 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+
+/* Hashtable for XRay */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "xray/xray_priv.h"
+
+#if defined(XRAY)
+
+struct XRayHashTableEntry {
+  void* data;
+  uint32_t key;
+};
+
+
+struct XRayHashTable {
+  int capacity;
+  int count;
+  struct XRayHashTableEntry* array;
+};
+
+
+XRAY_NO_INSTRUMENT void XRayHashTableGrow(struct XRayHashTable* table);
+XRAY_NO_INSTRUMENT uint32_t XRayHashTableHashKey(uint32_t key);
+XRAY_NO_INSTRUMENT void XRayHashTableInit(struct XRayHashTable* table,
+    int32_t capacity);
+
+#define HASH_HISTO 1024
+int g_hash_histo[HASH_HISTO];
+
+
+/* Hashes a 32bit key into a 32bit value. */
+uint32_t XRayHashTableHashKey(uint32_t x) {
+  uint32_t y = x * 7919;
+  uint32_t z;
+  size_t c;
+  uint8_t* s = (uint8_t*)&y;
+  /* based on djb2 hash function */
+  uint32_t h = 5381;
+  for (c = 0; c < sizeof(y); ++c) {
+    z = s[c];
+    h = ((h << 5) + h) + z;
+  }
+  return h;
+}
+
+
+int XRayHashTableGetCapacity(struct XRayHashTable* table) {
+  return table->capacity;
+}
+
+
+int XRayHashTableGetCount(struct XRayHashTable* table) {
+  return table->count;
+}
+
+
+/* Looks up key in hashtable and returns blind data. */
+void* XRayHashTableLookup(struct XRayHashTable* table, uint32_t key) {
+  uint32_t h = XRayHashTableHashKey(key);
+  uint32_t m = table->capacity - 1;
+  uint32_t j = h & m;
+  uint32_t i;
+  int z = 1;
+  for (i = 0; i < m; ++i) {
+    /* An empty entry means the {key, data} isn't in the table. */
+    if (NULL == table->array[j].data) {
+      ++g_hash_histo[0];
+      return NULL;
+    }
+    /* Search for address */
+    if (table->array[j].key == key) {
+      if (z >= HASH_HISTO)
+        z = HASH_HISTO - 1;
+      ++g_hash_histo[z];
+      return table->array[j].data;
+    }
+    j = (j + 1) & m;
+    ++z;
+  }
+  /* Table was full, and there wasn't a match. */
+  return NULL;
+}
+
+
+/* Inserts key & data into hash table.  No duplicates. */
+void* XRayHashTableInsert(struct XRayHashTable* table,
+                          void* data, uint32_t key) {
+  uint32_t h = XRayHashTableHashKey(key);
+  uint32_t m = table->capacity - 1;
+  uint32_t j = h & m;
+  uint32_t i;
+  for (i = 0; i < m; ++i) {
+    /* Take the first empty entry. */
+    /* (the key,data isn't already in the table) */
+    if (NULL == table->array[j].data) {
+      void* ret;
+      float ratio;
+      table->array[j].data = data;
+      table->array[j].key = key;
+      ++table->count;
+      ret = data;
+      ratio = (float)table->count / (float)table->capacity;
+      /* Double the capacity of the symtable if we've hit the ratio. */
+      if (ratio > XRAY_SYMBOL_TABLE_MAX_RATIO)
+        XRayHashTableGrow(table);
+      return ret;
+    }
+    /* If the key is already present, return the data in the table. */
+    if (table->array[j].key == key) {
+      return table->array[j].data;
+    }
+    j = (j + 1) & m;
+  }
+  /* Table was full */
+  return NULL;
+}
+
+
+void* XRayHashTableAtIndex(struct XRayHashTable* table, int i) {
+  if ((i < 0) || (i >= table->capacity))
+    return NULL;
+  return table->array[i].data;
+}
+
+
+/* Grows the hash table by doubling its capacity, */
+/* then re-inserts all the elements into the new table. */
+void XRayHashTableGrow(struct XRayHashTable* table) {
+  struct XRayHashTableEntry* old_array = table->array;
+  int old_capacity = table->capacity;
+  int new_capacity = old_capacity * 2;
+  int i;
+  printf("XRay: Growing a hash table...\n");
+  XRayHashTableInit(table, new_capacity);
+  for (i = 0; i < old_capacity; ++i) {
+    void* data = old_array[i].data;
+    if (NULL != data) {
+      uint32_t key = old_array[i].key;
+      XRayHashTableInsert(table, data, key);
+    }
+  }
+  XRayFree(old_array);
+}
+
+
+void XRayHashTableInit(struct XRayHashTable* table, int32_t capacity) {
+  size_t bytes;
+  if (0 != (capacity & (capacity - 1))) {
+    printf("Xray: Hash table capacity should be a power of 2!\n");
+    /* Round capacity up to next power of 2 */
+    /* see http://aggregate.org/MAGIC/  */
+    capacity--;
+    capacity |= capacity >> 1;
+    capacity |= capacity >> 2;
+    capacity |= capacity >> 4;
+    capacity |= capacity >> 8;
+    capacity |= capacity >> 16;
+    capacity++;
+  }
+  bytes = sizeof(table->array[0]) * capacity;
+  table->capacity = capacity;
+  table->count = 0;
+  table->array = (struct XRayHashTableEntry*)XRayMalloc(bytes);
+}
+
+
+/* Creates & inializes hash table. */
+struct XRayHashTable* XRayHashTableCreate(int capacity) {
+  struct XRayHashTable* table;
+  table = (struct XRayHashTable*)XRayMalloc(sizeof(*table));
+  XRayHashTableInit(table, capacity);
+  memset(&g_hash_histo[0], 0, sizeof(g_hash_histo[0]) * HASH_HISTO);
+  return table;
+}
+
+
+/* Prints hash table performance to file; for debugging. */
+void XRayHashTableHisto(FILE* f) {
+  int i;
+  for (i = 0; i < HASH_HISTO; ++i) {
+    if (0 != g_hash_histo[i])
+      fprintf(f, "hash_iterations[%d] = %d\n", i, g_hash_histo[i]);
+  }
+}
+
+
+/* Frees hash table. */
+/* Note: Does not free what the hash table entries point to. */
+void XRayHashTableFree(struct XRayHashTable* table) {
+  XRayFree(table->array);
+  table->capacity = 0;
+  table->count = 0;
+  table->array = NULL;
+  XRayFree(table);
+}
+
+#endif  /* XRAY */
+
diff --git a/hermit/usr/xray/parsesymbols.c b/hermit/usr/xray/parsesymbols.c
new file mode 100644
index 000000000..e2afd4413
--- /dev/null
+++ b/hermit/usr/xray/parsesymbols.c
@@ -0,0 +1,96 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+
+/* XRay -- a simple profiler for Native Client */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "xray/xray_priv.h"
+
+#if defined(XRAY)
+
+struct XRaySymbol* XRaySymbolTableCreateEntry(struct XRaySymbolTable* symtab,
+                                              char* line) {
+  uint32_t addr;
+  unsigned int uiaddr;
+  char symbol_text[XRAY_LINE_SIZE];
+  char* parsed_symbol;
+  char* newln;
+  if (2 != sscanf(line, "%x %1023s", &uiaddr, symbol_text))
+    return NULL;
+  if (uiaddr > 0x07FFFFFF) {
+    fprintf(stderr, "While parsing the mapfile, XRay encountered:\n");
+    fprintf(stderr, "%s\n", line);
+    fprintf(stderr,
+        "XRay only works with code addresses 0x00000000 - 0x07FFFFFF\n");
+    fprintf(stderr, "All functions must reside in this address space.\n");
+    exit(-1);
+  }
+  addr = (uint32_t)uiaddr;
+  parsed_symbol = strstr(line, symbol_text);
+  newln = strstr(parsed_symbol, "\n");
+  if (NULL != newln) {
+    *newln = 0;
+  }
+  return XRaySymbolTableAddByName(symtab, parsed_symbol, addr);
+}
+
+
+void XRaySymbolTableParseMapfile(struct XRaySymbolTable* symtab,
+                                 const char* mapfile) {
+  FILE* f;
+  char line[XRAY_LINE_SIZE];
+  bool in_text = false;
+  bool in_link_once = false;
+  int in_link_once_counter = 0;
+  int num_symbols = 0;
+
+  printf("XRay: opening mapfile %s\n", mapfile);
+  f = fopen(mapfile, "rt");
+  if (0 == f) {
+    fprintf(stderr, "XRay: failed to open %s\n", mapfile);
+    return;
+  }
+  printf("XRay: parsing...\n");
+  while (NULL != fgets(line, XRAY_LINE_SIZE, f)) {
+    if (line == strstr(line, " .text ")) {
+      in_text = true;
+      continue;
+    }
+    if (line == strstr(line, " .gnu.linkonce.t.")) {
+      in_link_once = true;
+      in_link_once_counter = 0;
+      continue;
+    }
+    if (line == strstr(line, " .text.")) {
+      in_link_once = true;
+      in_link_once_counter = 0;
+      continue;
+    }
+    if (line == strstr(line, "                0x")) {
+      if (in_text) {
+        XRaySymbolTableCreateEntry(symtab, line);
+        ++num_symbols;
+      } else if (in_link_once) {
+        if (in_link_once_counter != 0) {
+          if (NULL != XRaySymbolTableCreateEntry(symtab, line))
+            ++num_symbols;
+        } else {
+          ++in_link_once_counter;
+        }
+      }
+    } else {
+      in_text = false;
+      in_link_once = false;
+    }
+  }
+  fclose(f);
+  printf("XRay: parsed %d symbols into symbol table\n", num_symbols);
+}
+
+#endif  // XRAY
diff --git a/hermit/usr/xray/report.c b/hermit/usr/xray/report.c
new file mode 100644
index 000000000..20e9e84ac
--- /dev/null
+++ b/hermit/usr/xray/report.c
@@ -0,0 +1,209 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+
+/* XRay -- a simple profiler for Native Client */
+
+#include <alloca.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "xray/xray_priv.h"
+
+#if defined(XRAY)
+
+struct XRayTotal {
+  int index;
+  int frame;
+  uint64_t ticks;
+};
+
+
+/* Dumps the trace report for a given frame. */
+void XRayTraceReport(struct XRayTraceCapture* capture,
+                     FILE* f,
+                     int frame,
+                     char* label,
+                     float percent_cutoff,
+                     int ticks_cutoff) {
+  int index;
+  int start;
+  int end;
+  float total;
+  char space[257];
+  struct XRaySymbolTable* symbols = XRayGetSymbolTable(capture);
+  memset(space, ' ', 256);
+  space[256] = 0;
+  if (NULL == f) {
+    f = stdout;
+  }
+  fprintf(f,
+      "====================================================================\n");
+  if (NULL != label)
+    fprintf(f, "label %s\n", label);
+  fprintf(f, "\n");
+  fprintf(f,
+      "   Address          Ticks   Percent      Function    [annotation...]\n");
+  fprintf(f,
+      "--------------------------------------------------------------------\n");
+  total = XRayFrameGetTotalTicks(capture, frame);
+  start = XRayFrameGetTraceStartIndex(capture, frame);
+  end = XRayFrameGetTraceEndIndex(capture, frame);
+  index = start;
+  while (index != end) {
+    if (!XRayTraceIsAnnotation(capture, index)) {
+      const char* symbol_name;
+      char annotation[XRAY_TRACE_ANNOTATION_LENGTH];
+      struct XRayTraceBufferEntry* e = XRayTraceGetEntry(capture, index);
+      uint32_t depth = XRAY_EXTRACT_DEPTH(e->depth_addr);
+      uint32_t addr = XRAY_EXTRACT_ADDR(e->depth_addr);
+      uint32_t annotation_index = e->annotation_index;
+      uint64_t ticks =
+          e->end_tick > e->start_tick ? e->end_tick - e->start_tick : 0;
+      float percent = 100.0f * (float)ticks / total;
+      if (percent >= percent_cutoff && ticks >= ticks_cutoff) {
+        struct XRaySymbol* symbol;
+        symbol = XRaySymbolTableLookup(symbols, addr);
+        symbol_name = XRaySymbolGetName(symbol);
+        if (0 != annotation_index) {
+          XRayTraceCopyToString(capture, annotation_index, annotation);
+        } else {
+          strcpy(annotation, "");
+        }
+        fprintf(f, "0x%08X   %12" PRIu64 "     %5.1f     %s%s %s\n",
+                (unsigned int)addr, ticks, percent,
+                &space[256 - depth], symbol_name, annotation);
+      }
+    }
+    index = XRayTraceNextEntry(capture, index);
+  }
+  fflush(f);
+}
+
+
+int qcompare(const void* a, const void* b) {
+  struct XRayTotal* ia = (struct XRayTotal*)a;
+  struct XRayTotal* ib = (struct XRayTotal*)b;
+  if (ib->ticks > ia->ticks)
+    return 1;
+  else if (ib->ticks < ia->ticks)
+    return -1;
+  return 0;
+}
+
+
+/* Dumps a frame report */
+void XRayFrameReport(struct XRayTraceCapture* capture, FILE* f) {
+  int i;
+  int head = XRayFrameGetHead(capture);
+  int frame = XRayFrameGetTail(capture);
+  int counter = 0;
+  int total_capture = 0;
+  struct XRayTotal* totals;
+  totals = (struct XRayTotal*)
+    alloca(XRayFrameGetCount(capture) * sizeof(struct XRayTotal));
+  fprintf(f, "\n");
+  fprintf(f,
+      "Frame#        Total Ticks      Capture size    Annotations   Label\n");
+  fprintf(f,
+      "--------------------------------------------------------------------\n");
+  while (frame != head) {
+    uint64_t total_ticks = XRayFrameGetTotalTicks(capture, frame);
+    int capture_size = XRayFrameGetTraceCount(capture, frame);
+    int annotation_count = XRayFrameGetAnnotationCount(capture, frame);
+    bool valid = XRayFrameIsValid(capture, frame);
+    char label[XRAY_MAX_LABEL];
+    XRayFrameMakeLabel(capture, counter, label);
+    fprintf(f, "   %3d %s     %12" PRIu64 "        %10d     %10d   %s\n",
+      counter,
+      valid ? " " : "*",
+      total_ticks,
+      capture_size,
+      annotation_count,
+      label);
+    totals[counter].index = counter;
+    totals[counter].frame = frame;
+    totals[counter].ticks = total_ticks;
+    total_capture += capture_size;
+    ++counter;
+    frame = XRayFrameGetNext(capture, frame);
+  }
+  fprintf(f,
+      "--------------------------------------------------------------------\n");
+  fprintf(f,
+  "XRay: %d frame(s)    %d total capture(s)\n", counter, total_capture);
+  fprintf(f, "\n");
+  /* Sort and take average of the median cut */
+  qsort(totals, counter, sizeof(struct XRayTotal), qcompare);
+  fprintf(f, "\n");
+  fprintf(f, "Sorted by total ticks (most expensive first):\n");
+  fprintf(f, "\n");
+  fprintf(f,
+      "Frame#        Total Ticks      Capture size    Annotations   Label\n");
+  fprintf(f,
+      "--------------------------------------------------------------------\n");
+  for (i = 0; i < counter; ++i) {
+    int index = totals[i].index;
+    int frame = totals[i].frame;
+    uint64_t total_ticks = XRayFrameGetTotalTicks(capture, frame);
+    int capture_size = XRayFrameGetTraceCount(capture, frame);
+    int annotation_count = XRayFrameGetAnnotationCount(capture, frame);
+    char label[XRAY_MAX_LABEL];
+    XRayFrameMakeLabel(capture, index, label);
+    fprintf(f, "   %3d       %12" PRIu64 "        %10d     %10d   %s\n",
+        index,
+        total_ticks,
+        capture_size,
+        annotation_count,
+        label);
+  }
+  fflush(f);
+}
+
+
+/* Dump a frame report followed by trace report(s) for each frame. */
+void XRayReport(struct XRayTraceCapture* capture,
+                FILE* f,
+                float percent_cutoff,
+                int ticks_cutoff) {
+  int head = XRayFrameGetHead(capture);
+  int frame = XRayFrameGetTail(capture);
+  int counter = 0;
+  XRayFrameReport(capture, f);
+  fprintf(f, "\n");
+  while (frame != head) {
+    char label[XRAY_MAX_LABEL];
+    fprintf(f, "\n");
+    XRayFrameMakeLabel(capture, counter, label);
+    XRayTraceReport(capture, f, frame, label, percent_cutoff, ticks_cutoff);
+    ++counter;
+    frame = XRayFrameGetNext(capture, frame);
+  }
+  fprintf(f,
+      "====================================================================\n");
+#if defined(XRAY_OUTPUT_HASH_COLLISIONS)
+  XRayHashTableHisto(capture, f);
+#endif
+  fflush(f);
+}
+
+/* Write a profile report to text file. */
+void XRaySaveReport(struct XRayTraceCapture* capture,
+                    const char* filename,
+                    float percent_cutoff,
+                    int ticks_cutoff) {
+  FILE* f;
+  f = fopen(filename, "wt");
+  if (NULL != f) {
+    XRayReport(capture, f, percent_cutoff, ticks_cutoff);
+    fclose(f);
+  }
+}
+
+#endif  /* XRAY */
diff --git a/hermit/usr/xray/stringpool.c b/hermit/usr/xray/stringpool.c
new file mode 100644
index 000000000..bc8ac0956
--- /dev/null
+++ b/hermit/usr/xray/stringpool.c
@@ -0,0 +1,94 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+
+/* XRay string pool */
+
+/* String pool holds a large pile of strings. */
+/* It is up to higher level data structures to avoid duplicates. */
+/* It is up to higher level data structures to provide fast lookups. */
+
+/* _GNU_SOURCE must be defined prior to the inclusion of string.h
+ * so that strnlen is available with glibc */
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <string.h>
+#include "xray/xray_priv.h"
+
+#if defined(XRAY)
+
+struct XRayStringPoolNode {
+  struct XRayStringPoolNode* next;
+  char strings[XRAY_STRING_POOL_NODE_SIZE];
+};
+
+
+struct XRayStringPool {
+  struct XRayStringPoolNode* head;
+  struct XRayStringPoolNode* current;
+  int index;
+};
+
+
+static struct XRayStringPoolNode* XRayStringPoolAllocNode() {
+  struct XRayStringPoolNode* s;
+  s = (struct XRayStringPoolNode *)XRayMalloc(sizeof(*s));
+  s->next = NULL;
+  return s;
+}
+
+
+static int XRayStringPoolCurrentNodeSpaceAvail(struct XRayStringPool* pool) {
+  int i = pool->index;
+  return (XRAY_STRING_POOL_NODE_SIZE - i) - 1;
+}
+
+
+/* Append a string to the string pool. */
+char* XRayStringPoolAppend(struct XRayStringPool* pool, const char* src) {
+  /* Add +1 to STRING_POOL_NODE_SIZE to detect large strings */
+  /* Add +1 to strnlen result to account for string termination */
+  int n = strnlen(src, XRAY_STRING_POOL_NODE_SIZE + 1) + 1;
+  int a = XRayStringPoolCurrentNodeSpaceAvail(pool);
+  char* dst;
+  /* Don't accept strings larger than the pool node. */
+  if (n >= (XRAY_STRING_POOL_NODE_SIZE - 1))
+    return NULL;
+  /* If string doesn't fit, alloc a new node. */
+  if (n > a) {
+    pool->current->next = XRayStringPoolAllocNode();
+    pool->current = pool->current->next;
+    pool->index = 0;
+  }
+  /* Copy string and return a pointer to copy. */
+  dst = &pool->current->strings[pool->index];
+  strcpy(dst, src);
+  pool->index += n;
+  return dst;
+}
+
+
+/* Create & initialize a string pool instance. */
+struct XRayStringPool* XRayStringPoolCreate() {
+  struct XRayStringPool* pool;
+  pool = (struct XRayStringPool*)XRayMalloc(sizeof(*pool));
+  pool->head = XRayStringPoolAllocNode();
+  pool->current = pool->head;
+  return pool;
+}
+
+
+/* Free a string pool. */
+void XRayStringPoolFree(struct XRayStringPool* pool) {
+  struct XRayStringPoolNode* n = pool->head;
+  while (NULL != n) {
+    struct XRayStringPoolNode* c = n;
+    n = n->next;
+    XRayFree(c);
+  }
+  XRayFree(pool);
+}
+
+#endif  /* XRAY */
+
diff --git a/hermit/usr/xray/symtable.c b/hermit/usr/xray/symtable.c
new file mode 100644
index 000000000..1f0584c7f
--- /dev/null
+++ b/hermit/usr/xray/symtable.c
@@ -0,0 +1,200 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+/* XRay symbol table */
+
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(__GLIBC__)
+#include <dlfcn.h>
+#endif
+
+#include "xray/xray_priv.h"
+#define PNACL_STRING_OFFSET (0x10000000)
+
+#if defined(XRAY)
+
+bool g_symtable_debug = false;
+
+struct XRayFrameInfo {
+  int times_called;
+  int total_ticks;
+};
+
+
+struct XRaySymbol {
+  const char* name;
+  struct XRayFrameInfo frames[XRAY_MAX_FRAMES];
+};
+
+
+struct XRaySymbolPoolNode {
+  struct XRaySymbolPoolNode* next;
+  struct XRaySymbol symbols[XRAY_SYMBOL_POOL_NODE_SIZE];
+};
+
+
+struct XRaySymbolPool {
+  struct XRaySymbolPoolNode* head;
+  struct XRaySymbolPoolNode* current;
+  int index;
+};
+
+
+struct XRaySymbolTable {
+  int num_symbols;
+  struct XRayHashTable* hash_table;
+  struct XRayStringPool* string_pool;
+  struct XRaySymbolPool* symbol_pool;
+};
+
+
+const char* XRaySymbolGetName(struct XRaySymbol* symbol) {
+  return (NULL == symbol) ? "(null)" : symbol->name;
+}
+
+
+struct XRaySymbol* XRaySymbolCreate(struct XRaySymbolPool* sympool,
+                                    const char* name)
+{
+  struct XRaySymbol* symbol;
+  symbol = XRaySymbolPoolAlloc(sympool);
+  symbol->name = name;
+  return symbol;
+}
+
+
+struct XRaySymbol* XRaySymbolPoolAlloc(struct XRaySymbolPool* sympool) {
+  struct XRaySymbol* symbol;
+  if (sympool->index >= XRAY_SYMBOL_POOL_NODE_SIZE) {
+    struct XRaySymbolPoolNode* new_pool;
+    new_pool = (struct XRaySymbolPoolNode*)XRayMalloc(sizeof(*new_pool));
+    sympool->current->next = new_pool;
+    sympool->current = new_pool;
+    sympool->index = 0;
+  }
+  symbol = &sympool->current->symbols[sympool->index];
+  ++sympool->index;
+  return symbol;
+}
+
+
+struct XRaySymbolPool* XRaySymbolPoolCreate() {
+  struct XRaySymbolPool* sympool;
+  struct XRaySymbolPoolNode* node;
+  sympool = (struct XRaySymbolPool*)XRayMalloc(sizeof(*sympool));
+  node = (struct XRaySymbolPoolNode*)XRayMalloc(sizeof(*node));
+  sympool->head = node;
+  sympool->current = node;
+  sympool->index = 0;
+  return sympool;
+}
+
+
+void XRaySymbolPoolFree(struct XRaySymbolPool* pool) {
+  struct XRaySymbolPoolNode* n = pool->head;
+  while (NULL != n) {
+    struct XRaySymbolPoolNode* c = n;
+    n = n->next;
+    XRayFree(c);
+  }
+  XRayFree(pool);
+}
+
+
+int XRaySymbolTableGetCount(struct XRaySymbolTable* symtab) {
+  return XRayHashTableGetCount(symtab->hash_table);
+}
+
+
+struct XRaySymbol* XRaySymbolTableAtIndex(struct XRaySymbolTable* symtab,
+                                          int i) {
+  return (struct XRaySymbol*)XRayHashTableAtIndex(symtab->hash_table, i);
+}
+
+struct XRaySymbol* XRaySymbolTableAdd(struct XRaySymbolTable* symtab,
+                                      struct XRaySymbol* symbol,
+                                      uint32_t addr) {
+  struct XRaySymbol* sym = (struct XRaySymbol*)
+      XRayHashTableInsert(symtab->hash_table, symbol, addr);
+  symtab->num_symbols = XRayHashTableGetCount(symtab->hash_table);
+  return sym;
+}
+
+struct XRaySymbol* XRaySymbolTableAddByName(struct XRaySymbolTable* symtab,
+                                            const char* name, uint32_t addr) {
+  char* recorded_name;
+  struct XRaySymbol* symbol;
+  char buffer[XRAY_LINE_SIZE];
+  const char* demangled_name = XRayDemangle(buffer, XRAY_LINE_SIZE, name);
+  /* record the demangled symbol name into the string pool */
+  recorded_name = XRayStringPoolAppend(symtab->string_pool, demangled_name);
+  if (g_symtable_debug)
+    printf("adding symbol %s\n", recorded_name);
+  /* construct a symbol and put it in the symbol table */
+  symbol = XRaySymbolCreate(symtab->symbol_pool, recorded_name);
+  return XRaySymbolTableAdd(symtab, symbol, addr);
+}
+
+struct XRaySymbol* XRaySymbolTableLookup(struct XRaySymbolTable* symtab,
+                                         uint32_t addr) {
+  void *x = XRayHashTableLookup(symtab->hash_table, addr);
+  struct XRaySymbol* r = (struct XRaySymbol*)x;
+
+#if defined(__pnacl__)
+  if (r == NULL) {
+    /* Addresses are trimed to 24 bits for internal storage, so we need to
+     * add this offset back in order to get the real address.
+     */
+    addr |= PNACL_STRING_OFFSET;
+    const char* name = (const char*)addr;
+    struct XRaySymbol* symbol = XRaySymbolCreate(symtab->symbol_pool, name);
+    r = XRaySymbolTableAdd(symtab, symbol, addr);
+  }
+#endif
+
+#if defined(__GLIBC__)
+  if (r == NULL) {
+    Dl_info info;
+    if (dladdr((const void*)addr, &info) != 0)
+      if (info.dli_sname)
+        r = XRaySymbolTableAddByName(symtab, info.dli_sname, addr);
+  }
+#endif
+  return r;
+}
+
+
+/* Returns total number of symbols in the table. */
+int XRaySymbolCount(struct XRaySymbolTable* symtab) {
+  return symtab->num_symbols;
+}
+
+
+/* Creates and inializes a symbol table. */
+struct XRaySymbolTable* XRaySymbolTableCreate(int size) {
+  struct XRaySymbolTable* symtab;
+  symtab = (struct XRaySymbolTable*)XRayMalloc(sizeof(*symtab));
+  symtab->num_symbols = 0;
+  symtab->string_pool = XRayStringPoolCreate();
+  symtab->hash_table = XRayHashTableCreate(size);
+  symtab->symbol_pool = XRaySymbolPoolCreate();
+  return symtab;
+}
+
+
+/* Frees a symbol table. */
+void XRaySymbolTableFree(struct XRaySymbolTable* symtab) {
+  XRayStringPoolFree(symtab->string_pool);
+  XRaySymbolPoolFree(symtab->symbol_pool);
+  XRayHashTableFree(symtab->hash_table);
+  symtab->num_symbols = 0;
+  XRayFree(symtab);
+}
+
+#endif  /* XRAY */
diff --git a/hermit/usr/xray/xray.c b/hermit/usr/xray/xray.c
new file mode 100644
index 000000000..9e49591fe
--- /dev/null
+++ b/hermit/usr/xray/xray.c
@@ -0,0 +1,780 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+
+/* XRay -- a simple profiler for Native Client */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include "xray/xray_priv.h"
+
+#if defined(XRAY)
+
+/* GTSC - Get Time Stamp Counter */
+#if defined(__amd64__) && !defined(XRAY_NO_RDTSC)
+XRAY_INLINE uint64_t RDTSC64();
+uint64_t RDTSC64() {
+  uint64_t a, d;
+  __asm__ __volatile__("rdtsc" : "=a" (a), "=d" (d));
+  return ((uint64_t)a) | (((uint64_t)d) << 32);
+}
+#define GTSC(_x) _x = RDTSC64()
+#elif defined(__i386__) && !defined(XRAY_NO_RDTSC)
+#define GTSC(_x)      __asm__ __volatile__ ("rdtsc" : "=A" (_x));
+#else
+XRAY_INLINE uint64_t GTOD();
+uint64_t GTOD() {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  return (uint64_t)tv.tv_sec * 1000000 + (uint64_t)tv.tv_usec;
+}
+#define GTSC(_x) _x = GTOD();
+#endif
+
+/* Use a TLS variable for cheap thread uid. */
+__thread struct XRayTraceCapture* g_xray_capture = NULL;
+__thread int g_xray_thread_id_placeholder = 0;
+
+
+struct XRayTraceStackEntry {
+  uint32_t depth_addr;
+  uint64_t tsc;
+  uint32_t dest;
+  uint32_t annotation_index;
+};
+
+
+struct XRayTraceFrameEntry {
+  /* Indices into global tracebuffer */
+  int start;
+  int end;
+  uint64_t start_tsc;
+  uint64_t end_tsc;
+  uint64_t total_ticks;
+  int annotation_count;
+  bool valid;
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+  struct XRayTimestampPair start_time;
+  struct XRayTimestampPair end_time;
+#endif
+};
+
+
+struct XRayTraceFrame {
+  struct XRayTraceFrameEntry* entry;
+  int head;
+  int tail;
+  int count;
+};
+
+
+struct XRayTraceCapture {
+  /* Common variables share cache line */
+  bool recording;
+  uint32_t stack_depth;
+  uint32_t max_stack_depth;
+  int buffer_index;
+  int buffer_size;
+  int disabled;
+  int annotation_count;
+  struct XRaySymbolTable* symbols;
+  bool initialized;
+  uint32_t annotation_filter;
+  uint32_t guard0;
+  struct XRayTraceStackEntry stack[XRAY_TRACE_STACK_SIZE] XRAY_ALIGN64;
+  uint32_t guard1;
+  uint32_t guard2;
+  char annotation[XRAY_ANNOTATION_STACK_SIZE] XRAY_ALIGN64;
+  uint32_t guard3;
+  struct XRayTraceBufferEntry* buffer;
+  struct XRayTraceFrame frame;
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+  int32_t thread_id;
+#endif
+} XRAY_ALIGN64;
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(__pnacl__)
+XRAY_NO_INSTRUMENT void __pnacl_profile_func_enter(const char* fname);
+XRAY_NO_INSTRUMENT void __pnacl_profile_func_exit(const char* fname);
+#else
+XRAY_NO_INSTRUMENT void __cyg_profile_func_enter(void* this_fn,
+                                                 void* call_site);
+XRAY_NO_INSTRUMENT void __cyg_profile_func_exit(void* this_fn,
+                                                void* call_site);
+#endif
+
+XRAY_INLINE int XRayTraceDecrementIndexInline(
+    struct XRayTraceCapture* capture, int index);
+XRAY_INLINE int XRayTraceIncrementIndexInline(
+    struct XRayTraceCapture* capture, int index);
+
+
+XRAY_NO_INSTRUMENT void __xray_profile_append_annotation(
+    struct XRayTraceCapture* capture,
+    struct XRayTraceStackEntry* se,
+    struct XRayTraceBufferEntry* be);
+
+#ifdef __cplusplus
+}
+#endif
+
+/* Asserts that the guard values haven't changed. */
+void XRayCheckGuards(struct XRayTraceCapture* capture) {
+  assert(capture->guard0 == XRAY_GUARD_VALUE_0x12345678);
+  assert(capture->guard1 == XRAY_GUARD_VALUE_0x12345678);
+  assert(capture->guard2 == XRAY_GUARD_VALUE_0x87654321);
+  assert(capture->guard3 == XRAY_GUARD_VALUE_0x12345678);
+}
+
+/* Decrements the trace index, wrapping around if needed. */
+int XRayTraceDecrementIndexInline(
+    struct XRayTraceCapture* capture, int index) {
+  --index;
+  if (index < 0)
+    index = capture->buffer_size - 1;
+  return index;
+}
+
+/* Increments the trace index, wrapping around if needed. */
+int XRayTraceIncrementIndexInline(
+    struct XRayTraceCapture* capture, int index) {
+  ++index;
+  if (index >= capture->buffer_size)
+    index = 0;
+  return index;
+}
+
+/* Returns true if the trace entry is an annotation string. */
+bool XRayTraceIsAnnotation(
+    struct XRayTraceCapture* capture, int index) {
+  struct XRayTraceBufferEntry* be = &capture->buffer[index];
+  char* dst = (char*)be;
+  return 0 == *dst;
+}
+
+int XRayTraceIncrementIndex(struct XRayTraceCapture* capture, int index) {
+  return XRayTraceIncrementIndexInline(capture, index);
+}
+
+int XRayTraceDecrementIndex(struct XRayTraceCapture* capture, int index) {
+  return XRayTraceDecrementIndexInline(capture, index);
+}
+
+/* The entry in the tracebuffer at index is an annotation string. */
+/* Calculate the next index value representing the next trace entry. */
+int XRayTraceSkipAnnotation(struct XRayTraceCapture* capture, int index) {
+  /* Annotations are strings embedded in the trace buffer. */
+  /* An annotation string can span multiple trace entries. */
+  /* Skip over the string by looking for zero termination. */
+  assert(capture);
+  assert(XRayTraceIsAnnotation(capture, index));
+  bool done = false;
+  int start_index = 1;
+  int i;
+  while (!done) {
+    char* str = (char*) &capture->buffer[index];
+    const int num = sizeof(capture->buffer[index]);
+    for (i = start_index; i < num; ++i) {
+      if (0 == str[i]) {
+        done = true;
+        break;
+      }
+    }
+    index = XRayTraceIncrementIndexInline(capture, index);
+    start_index = 0;
+  }
+  return index;
+}
+
+
+struct XRayTraceBufferEntry* XRayTraceGetEntry(
+    struct XRayTraceCapture* capture, int index) {
+  return &capture->buffer[index];
+}
+
+/* Starting at index, return the index into the trace buffer */
+/* for the next trace entry.  Index can wrap (ringbuffer) */
+int XRayTraceNextEntry(struct XRayTraceCapture* capture, int index) {
+  if (XRayTraceIsAnnotation(capture, index))
+    index = XRayTraceSkipAnnotation(capture, index);
+  else
+    index = XRayTraceIncrementIndexInline(capture, index);
+  return index;
+}
+
+int XRayFrameGetTraceStartIndex(struct XRayTraceCapture* capture, int frame) {
+  assert(capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  return capture->frame.entry[frame].start;
+}
+
+int XRayFrameGetTraceEndIndex(struct XRayTraceCapture* capture, int frame) {
+  assert(capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  return capture->frame.entry[frame].end;
+}
+
+/* Not very accurate, annotation strings will also be counted as "entries" */
+int XRayFrameGetTraceCount(
+    struct XRayTraceCapture* capture, int frame) {
+  assert(true == capture->initialized);
+  assert(frame >= 0);
+  assert(frame < capture->frame.count);
+  assert(!capture->recording);
+  int start = capture->frame.entry[frame].start;
+  int end = capture->frame.entry[frame].end;
+  int num;
+  if (start < end)
+    num = end - start;
+  else
+    num = capture->buffer_size - (start - end);
+  return num;
+}
+
+/* Append a string to trace buffer. */
+void XRayTraceAppendString(struct XRayTraceCapture* capture, char* src) {
+  int index = capture->buffer_index;
+  bool done = false;
+  int start_index = 1;
+  int s = 0;
+  int i;
+  char* dst = (char*)&capture->buffer[index];
+  const int num = sizeof(capture->buffer[index]);
+  dst[0] = 0;
+  while (!done) {
+    for (i = start_index; i < num; ++i) {
+      dst[i] = src[s];
+      if (0 == src[s]) {
+        dst[i] = 0;
+        done = true;
+        break;
+      }
+      ++s;
+    }
+    index = XRayTraceIncrementIndexInline(capture, index);
+    dst = (char*)&capture->buffer[index];
+    start_index = 0;
+  }
+  capture->buffer_index = index;
+}
+
+/* Copies annotation from trace buffer to output string. */
+int XRayTraceCopyToString(
+    struct XRayTraceCapture* capture, int index, char* dst) {
+  assert(XRayTraceIsAnnotation(capture, index));
+  bool done = false;
+  int i;
+  int d = 0;
+  int start_index = 1;
+  while (!done) {
+    char* src = (char*) &capture->buffer[index];
+    const int num = sizeof(capture->buffer[index]);
+    for (i = start_index; i < num; ++i) {
+      dst[d] = src[i];
+      if (0 == src[i]) {
+        done = true;
+        break;
+      }
+      ++d;
+    }
+    index = XRayTraceIncrementIndexInline(capture, index);
+    start_index = 0;
+  }
+  return index;
+}
+
+
+/* Generic memory malloc for XRay */
+/* validates pointer returned by malloc */
+/* memsets memory block to zero */
+void* XRayMalloc(size_t t) {
+  void* data;
+  data = calloc(1, t);
+  if (NULL == data) {
+    printf("XRay: malloc(%d) failed, panic shutdown!\n", t);
+    exit(-1);
+  }
+  return data;
+}
+
+
+/* Generic memory free for XRay */
+void XRayFree(void* data) {
+  assert(NULL != data);
+  free(data);
+}
+
+
+/* Main profile capture function that is called at the start */
+/* of every instrumented function.  This function is implicitly */
+/* called when code is compilied with the -finstrument-functions option */
+#if defined(__pnacl__)
+void __pnacl_profile_func_enter(const char* this_fn) {
+#else
+void __cyg_profile_func_enter(void* this_fn, void* call_site) {
+#endif
+  struct XRayTraceCapture* capture = g_xray_capture;
+  if (capture && capture->recording) {
+    uint32_t depth = capture->stack_depth;
+    if (depth < capture->max_stack_depth) {
+      struct XRayTraceStackEntry* se = &capture->stack[depth];
+      uint32_t addr = (uint32_t)(uintptr_t)this_fn;
+      se->depth_addr = XRAY_PACK_DEPTH_ADDR(depth, addr);
+      se->dest = capture->buffer_index;
+      se->annotation_index = 0;
+      GTSC(se->tsc);
+      capture->buffer_index =
+        XRayTraceIncrementIndexInline(capture, capture->buffer_index);
+    }
+    ++capture->stack_depth;
+  }
+}
+
+
+/* Main profile capture function that is called at the exit of */
+/* every instrumented function.  This function is implicity called */
+/* when the code is compiled with the -finstrument-functions option */
+#if defined(__pnacl__)
+void __pnacl_profile_func_exit(const char* this_fn) {
+#else
+void __cyg_profile_func_exit(void* this_fn, void* call_site) {
+#endif
+  struct XRayTraceCapture* capture = g_xray_capture;
+  if (capture && capture->recording) {
+    --capture->stack_depth;
+    if (capture->stack_depth < capture->max_stack_depth) {
+      uint32_t depth = capture->stack_depth;
+      struct XRayTraceStackEntry* se = &capture->stack[depth];
+      uint32_t buffer_index = se->dest;
+      uint64_t tsc;
+      struct XRayTraceBufferEntry* be = &capture->buffer[buffer_index];
+      GTSC(tsc);
+      be->depth_addr = se->depth_addr;
+      be->start_tick = se->tsc;
+      be->end_tick = tsc;
+      be->annotation_index = 0;
+      if (0 != se->annotation_index)
+        __xray_profile_append_annotation(capture, se, be);
+    }
+  }
+}
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+void XRayGetTSC(uint64_t* tsc) {
+  GTSC(*tsc);
+}
+
+int32_t XRayGetSavedThreadID(struct XRayTraceCapture* capture) {
+  return capture->thread_id;
+}
+
+struct XRayTimestampPair XRayFrameGetStartTimestampPair(
+    struct XRayTraceCapture* capture, int frame) {
+  return capture->frame.entry[frame].start_time;
+}
+
+struct XRayTimestampPair XRayFrameGetEndTimestampPair(
+    struct XRayTraceCapture* capture, int frame) {
+  return capture->frame.entry[frame].end_time;
+}
+#endif
+
+/* Special case appending annotation string to trace buffer */
+/* this function should only ever be called from __cyg_profile_func_exit() */
+void __xray_profile_append_annotation(struct XRayTraceCapture* capture,
+                                      struct XRayTraceStackEntry* se,
+                                      struct XRayTraceBufferEntry* be) {
+  struct XRayTraceStackEntry* parent = se - 1;
+  int start = parent->annotation_index;
+  be->annotation_index = capture->buffer_index;
+  char* str = &capture->annotation[start];
+  XRayTraceAppendString(capture, str);
+  *str = 0;
+  ++capture->annotation_count;
+}
+
+
+
+/* Annotates the trace buffer. no filtering. */
+void __XRayAnnotate(const char* fmt, ...) {
+  va_list args;
+  struct XRayTraceCapture* capture = g_xray_capture;
+  /* Only annotate functions recorded in the trace buffer. */
+  if (capture && capture->initialized) {
+    if (0 == capture->disabled) {
+      if (capture->recording) {
+        char buffer[1024];
+        int r;
+        va_start(args, fmt);
+        r = vsnprintf(buffer, sizeof(buffer), fmt, args);
+        va_end(args);
+        {
+          /* Get current string ptr */
+          int depth = capture->stack_depth - 1;
+          struct XRayTraceStackEntry* se = &capture->stack[depth];
+          if (0 == se->annotation_index) {
+            struct XRayTraceStackEntry* parent = se - 1;
+            se->annotation_index = parent->annotation_index;
+          }
+          char* dst = &capture->annotation[se->annotation_index];
+          strcpy(dst, buffer);
+          int len = strlen(dst);
+          se->annotation_index += len;
+        }
+      }
+    }
+  }
+}
+
+
+/* Annotates the trace buffer with user strings.  Can be filtered. */
+void __XRayAnnotateFiltered(const uint32_t filter, const char* fmt, ...) {
+  va_list args;
+  struct XRayTraceCapture* capture = g_xray_capture;
+  if (capture && capture->initialized) {
+    if (0 != (filter & capture->annotation_filter)) {
+      if (0 == capture->disabled) {
+        if (capture->recording) {
+          char buffer[XRAY_TRACE_ANNOTATION_LENGTH];
+          int r;
+          va_start(args, fmt);
+          r = vsnprintf(buffer, sizeof(buffer), fmt, args);
+          va_end(args);
+          {
+            /* get current string ptr */
+            int depth = capture->stack_depth - 1;
+            struct XRayTraceStackEntry* se = &capture->stack[depth];
+            if (0 == se->annotation_index) {
+              struct XRayTraceStackEntry* parent = se - 1;
+              se->annotation_index = parent->annotation_index;
+            }
+            char* dst = &capture->annotation[se->annotation_index];
+            strcpy(dst, buffer);
+            int len = strlen(dst);
+            se->annotation_index += len;
+          }
+        }
+      }
+    }
+  }
+}
+
+
+/* Allows user to specify annotation filter value, a 32 bit mask. */
+void XRaySetAnnotationFilter(struct XRayTraceCapture* capture,
+                             uint32_t filter) {
+  capture->annotation_filter = filter;
+}
+
+
+/* Reset xray profiler. */
+void XRayReset(struct XRayTraceCapture* capture) {
+  assert(capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  capture->buffer_index = 0;
+  capture->stack_depth = 0;
+  capture->disabled = 0;
+  capture->frame.head = 0;
+  capture->frame.tail = 0;
+  memset(capture->frame.entry, 0,
+    sizeof(capture->frame.entry[0]) * capture->frame.count);
+  memset(&capture->stack, 0,
+    sizeof(capture->stack[0]) * XRAY_TRACE_STACK_SIZE);
+  XRayCheckGuards(capture);
+}
+
+
+/* Change the maximum stack depth captures are made. */
+void XRaySetMaxStackDepth(struct XRayTraceCapture* capture, int stack_depth) {
+  assert(capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  if (stack_depth < 1)
+    stack_depth = 1;
+  if (stack_depth >= XRAY_TRACE_STACK_SIZE)
+    stack_depth = (XRAY_TRACE_STACK_SIZE - 1);
+  capture->max_stack_depth = stack_depth;
+}
+
+
+int XRayFrameGetCount(struct XRayTraceCapture* capture) {
+  return capture->frame.count;
+}
+
+int XRayFrameGetTail(struct XRayTraceCapture* capture) {
+  return capture->frame.tail;
+}
+
+int XRayFrameGetHead(struct XRayTraceCapture* capture) {
+  return capture->frame.head;
+}
+
+int XRayFrameGetPrev(struct XRayTraceCapture* capture, int i) {
+  i = i - 1;
+  if (i < 0)
+    i = capture->frame.count - 1;
+  return i;
+}
+
+int XRayFrameGetNext(struct XRayTraceCapture* capture, int i) {
+  i = i + 1;
+  if (i >= capture->frame.count)
+    i = 0;
+  return i;
+}
+
+bool XRayFrameIsValid(struct XRayTraceCapture* capture, int i) {
+  return capture->frame.entry[i].valid;
+}
+
+uint64_t XRayFrameGetTotalTicks(struct XRayTraceCapture* capture, int i) {
+  return capture->frame.entry[i].total_ticks;
+}
+
+int XRayFrameGetAnnotationCount(struct XRayTraceCapture* capture, int i) {
+  return capture->frame.entry[i].annotation_count;
+}
+
+void XRayFrameMakeLabel(struct XRayTraceCapture* capture,
+                        int counter,
+                        char* label) {
+  snprintf(label, XRAY_MAX_LABEL, "@@@frame%d@@@", counter);
+}
+
+
+/* Scans the ring buffer going backwards to find last valid complete frame. */
+/* Will mark whether frames are valid or invalid during the traversal. */
+int XRayFrameFindTail(struct XRayTraceCapture* capture) {
+  int head = capture->frame.head;
+  int index = XRayFrameGetPrev(capture, head);
+  int total_capture = 0;
+  int last_valid_frame = index;
+  /* Check for no captures */
+  if (capture->frame.head == capture->frame.tail)
+    return capture->frame.head;
+  /* Go back and invalidate all captures that have been stomped. */
+  while (index != head) {
+    bool valid = capture->frame.entry[index].valid;
+    if (valid) {
+      total_capture += XRayFrameGetTraceCount(capture, index) + 1;
+      if (total_capture < capture->buffer_size) {
+        last_valid_frame = index;
+        capture->frame.entry[index].valid = true;
+      } else {
+        capture->frame.entry[index].valid = false;
+      }
+    }
+    index = XRayFrameGetPrev(capture, index);
+  }
+  return last_valid_frame;
+}
+
+
+/* Starts a new frame and enables capturing, and must be paired with */
+/* XRayEndFrame()  Trace capturing only occurs on the thread which called */
+/* XRayBeginFrame() and each instance of capture can only trace one thread */
+/* at a time. */
+void XRayStartFrame(struct XRayTraceCapture* capture) {
+  int i;
+  assert(NULL == g_xray_capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  i = capture->frame.head;
+  XRayCheckGuards(capture);
+  /* Add a trace entry marker so we can detect wrap around stomping */
+  struct XRayTraceBufferEntry* be = &capture->buffer[capture->buffer_index];
+  be->depth_addr = XRAY_FRAME_MARKER;
+  capture->buffer_index =
+      XRayTraceIncrementIndex(capture, capture->buffer_index);
+  /* Set start of the frame we're about to trace */
+  capture->frame.entry[i].start = capture->buffer_index;
+  capture->disabled = 0;
+  capture->stack_depth = 1;
+
+  /* The trace stack[0] is reserved */
+  memset(&capture->stack[0], 0, sizeof(capture->stack[0]));
+  /* Annotation index 0 is reserved to indicate no annotation */
+  capture->stack[0].annotation_index = 1;
+  capture->annotation[0] = 0;
+  capture->annotation[1] = 0;
+  capture->annotation_count = 0;
+  capture->recording = true;
+  GTSC(capture->frame.entry[i].start_tsc);
+  g_xray_capture = capture;
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+  capture->frame.entry[i].start_time = XRayGenerateTimestampsNow();
+#endif
+}
+
+
+/* Ends a frame and disables capturing. Advances to the next frame. */
+/* Must be paired with XRayStartFrame(), and called from the same thread. */
+void XRayEndFrame(struct XRayTraceCapture* capture) {
+  int i;
+  assert(capture);
+  assert(capture->initialized);
+  assert(capture->recording);
+  assert(g_xray_capture == capture);
+  assert(0 == capture->disabled);
+  assert(1 == capture->stack_depth);
+  i = capture->frame.head;
+  GTSC(capture->frame.entry[i].end_tsc);
+  capture->frame.entry[i].total_ticks =
+    capture->frame.entry[i].end_tsc - capture->frame.entry[i].start_tsc;
+  capture->recording = NULL;
+  capture->frame.entry[i].end = capture->buffer_index;
+  capture->frame.entry[i].valid = true;
+  capture->frame.entry[i].annotation_count = capture->annotation_count;
+  capture->frame.head = XRayFrameGetNext(capture, capture->frame.head);
+  /* If the table is filled, bump the tail. */
+  if (capture->frame.head == capture->frame.tail)
+    capture->frame.tail = XRayFrameGetNext(capture, capture->frame.tail);
+  capture->frame.tail = XRayFrameFindTail(capture);
+  /* Check that we didn't stomp over trace entry marker. */
+  int marker = XRayTraceDecrementIndex(capture, capture->frame.entry[i].start);
+  struct XRayTraceBufferEntry* be = &capture->buffer[marker];
+  if (be->depth_addr != XRAY_FRAME_MARKER) {
+    fprintf(stderr,
+      "XRay: XRayStopFrame() detects insufficient trace buffer size!\n");
+    XRayReset(capture);
+  } else {
+    /* Replace marker with an empty annotation string. */
+    be->depth_addr = XRAY_NULL_ANNOTATION;
+    XRayCheckGuards(capture);
+  }
+  g_xray_capture = NULL;
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+  capture->frame.entry[i].end_time = XRayGenerateTimestampsNow();
+#endif
+}
+
+
+/* Get the last frame captured.  Do not call while capturing. */
+/* (ie call outside of XRayStartFrame() / XRayStopFrame() pair) */
+int XRayGetLastFrame(struct XRayTraceCapture* capture) {
+  assert(capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  assert(0 == capture->disabled);
+  assert(1 == capture->stack_depth);
+  int last_frame = XRayFrameGetPrev(capture, capture->frame.head);
+  return last_frame;
+}
+
+
+/* Disables capturing until a paired XRayEnableCapture() is called */
+/* This call can be nested, but must be paired with an enable */
+/* (If you need to just exclude a specific function and not its */
+/* children, the XRAY_NO_INSTRUMENT modifier might be better) */
+/* Must be called from same thread as XRayBeginFrame() / XRayEndFrame() */
+void XRayDisableCapture(struct XRayTraceCapture* capture) {
+  assert(capture);
+  assert(capture == g_xray_capture);
+  assert(capture->initialized);
+  ++capture->disabled;
+  capture->recording = false;
+}
+
+
+/* Re-enables capture.  Must be paired with XRayDisableCapture() */
+void XRayEnableCapture(struct XRayTraceCapture* capture) {
+  assert(capture);
+  assert(capture == g_xray_capture);
+  assert(capture->initialized);
+  assert(0 < capture->disabled);
+  --capture->disabled;
+  if (0 == capture->disabled) {
+    capture->recording = true;
+  }
+}
+
+
+
+struct XRaySymbolTable* XRayGetSymbolTable(struct XRayTraceCapture* capture) {
+  return capture->symbols;
+}
+
+
+/* Initialize XRay */
+struct XRayTraceCapture* XRayInit(int stack_depth,
+                                  int buffer_size,
+                                  int frame_count,
+                                  const char* mapfilename) {
+  struct XRayTraceCapture* capture;
+  capture = (struct XRayTraceCapture*)XRayMalloc(
+      sizeof(struct XRayTraceCapture));
+  int adj_frame_count = frame_count + 1;
+  size_t buffer_size_in_bytes =
+      sizeof(capture->buffer[0]) * buffer_size;
+  size_t frame_size_in_bytes =
+      sizeof(capture->frame.entry[0]) * adj_frame_count;
+  capture->buffer =
+      (struct XRayTraceBufferEntry *)XRayMalloc(buffer_size_in_bytes);
+  capture->frame.entry =
+      (struct XRayTraceFrameEntry *)XRayMalloc(frame_size_in_bytes);
+  capture->buffer_size = buffer_size;
+  capture->frame.count = adj_frame_count;
+  capture->frame.head = 0;
+  capture->frame.tail = 0;
+  capture->disabled = 0;
+  capture->annotation_filter = 0xFFFFFFFF;
+  capture->guard0 = XRAY_GUARD_VALUE_0x12345678;
+  capture->guard1 = XRAY_GUARD_VALUE_0x12345678;
+  capture->guard2 = XRAY_GUARD_VALUE_0x87654321;
+  capture->guard3 = XRAY_GUARD_VALUE_0x12345678;
+  capture->initialized = true;
+  capture->recording = false;
+  XRaySetMaxStackDepth(capture, stack_depth);
+  XRayReset(capture);
+
+  /* Mapfile is optional; we don't need it for captures, only for reports. */
+  capture->symbols =
+      XRaySymbolTableCreate(XRAY_DEFAULT_SYMBOL_TABLE_SIZE);
+  if (NULL != mapfilename)
+    XRaySymbolTableParseMapfile(capture->symbols, mapfilename);
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+  /* Use the address of a thread local variable as a fake thread id. */
+  capture->thread_id = (int32_t)(&g_xray_thread_id_placeholder);
+#endif
+
+  return capture;
+}
+
+
+/* Shut down and free memory used by XRay. */
+void XRayShutdown(struct XRayTraceCapture* capture) {
+  assert(capture);
+  assert(capture->initialized);
+  assert(!capture->recording);
+  XRayCheckGuards(capture);
+  if (NULL != capture->symbols) {
+    XRaySymbolTableFree(capture->symbols);
+  }
+  XRayFree(capture->frame.entry);
+  XRayFree(capture->buffer);
+  capture->initialized = false;
+  XRayFree(capture);
+}
+
+#endif  /* XRAY */
diff --git a/hermit/usr/xray/xray.h b/hermit/usr/xray/xray.h
new file mode 100644
index 000000000..32feed0a0
--- /dev/null
+++ b/hermit/usr/xray/xray.h
@@ -0,0 +1,117 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+/* XRay -- a simple profiler for Native Client */
+
+
+#ifndef LIBRARIES_XRAY_XRAY_H_
+#define LIBRARIES_XRAY_XRAY_H_
+
+#include <stdint.h>
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+#include "ppapi/c/ppb.h"
+#endif
+
+#if defined(__arm__)
+#undef XRAY
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define XRAY_NO_INSTRUMENT  __attribute__((no_instrument_function))
+#define XRAY_INLINE __attribute__((always_inline, no_instrument_function))
+
+#if defined(XRAY)
+
+/* Do not call __XRayAnnotate* directly; instead use the */
+/* XRayAnnotate() macros below. */
+XRAY_NO_INSTRUMENT void __XRayAnnotate(const char* str, ...)
+  __attribute__ ((format(printf, 1, 2)));
+XRAY_NO_INSTRUMENT void __XRayAnnotateFiltered(const uint32_t filter,
+  const char* str, ...) __attribute__ ((format(printf, 2, 3)));
+
+/* This is the beginning of the public XRay API */
+
+/* Ok if mapfilename is NULL, no symbols will be loaded.  On glibc builds,
+ * XRay will also attempt to populate the symbol table with dladdr()
+ */
+XRAY_NO_INSTRUMENT struct XRayTraceCapture* XRayInit(int stack_size,
+                                                     int buffer_size,
+                                                     int frame_count,
+                                                     const char* mapfilename);
+XRAY_NO_INSTRUMENT void XRayShutdown(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRayStartFrame(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRayEndFrame(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRaySetAnnotationFilter(
+    struct XRayTraceCapture* capture, uint32_t filter);
+XRAY_NO_INSTRUMENT void XRaySaveReport(struct XRayTraceCapture* capture,
+                                       const char* filename,
+                                       float percent_cutoff,
+                                       int cycle_cutoff);
+XRAY_NO_INSTRUMENT void XRayReport(struct XRayTraceCapture* capture,
+                                   FILE* f,
+                                   float percent_cutoff,
+                                   int ticks_cutoff);
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+XRAY_NO_INSTRUMENT void XRayBrowserTraceReport(
+    struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRayRegisterBrowserInterface(
+    PPB_GetInterface get_browser_interface);
+#endif  /* XRAY_DISABLE_BROWSER_INTEGRATION */
+
+
+#if defined(XRAY_ANNOTATE)
+#define XRayAnnotate(...) __XRayAnnotate(__VA_ARGS__)
+#define XRayAnnotateFiltered(...) __XRayAnnotateFiltered(__VA_ARGS__)
+#else
+#define XRayAnnotate(...)
+#define XRayAnnotateFiltered(...)
+#endif
+/* This is the end of the public XRay API */
+
+#else  /* defined(XRAY) */
+
+/* Builds that don't define XRAY will use these 'null' functions instead. */
+
+#define XRayAnnotate(...)
+#define XRayAnnotateFiltered(...)
+
+inline struct XRayTraceCapture* XRayInit(int stack_size,
+                                         int buffer_size,
+                                         int frame_count,
+                                         const char* mapfilename) {
+  return NULL;
+}
+inline void XRayShutdown(struct XRayTraceCapture* capture) {}
+inline void XRayStartFrame(struct XRayTraceCapture* capture) {}
+inline void XRayEndFrame(struct XRayTraceCapture* capture) {}
+inline void XRaySetAnnotationFilter(struct XRayTraceCapture* capture,
+                                    uint32_t filter) {}
+inline void XRaySaveReport(struct XRayTraceCapture* capture,
+                           const char* filename,
+                           float percent_cutoff,
+                           int cycle_cutoff) {}
+inline void XRayReport(struct XRayTraceCapture* capture,
+                       FILE* f,
+                       float percent_cutoff,
+                       int ticks_cutoff) {}
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+inline void XRayBrowserTraceReport(struct XRayTraceCapture* capture) {}
+inline void XRayRegisterBrowserInterface(
+    PPB_GetInterface get_browser_interface) {}
+#endif  /* XRAY_DISABLE_BROWSER_INTEGRATION */
+
+
+#endif  /* defined(XRAY) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* LIBRARIES_XRAY_XRAY_H_ */
diff --git a/hermit/usr/xray/xray.odt b/hermit/usr/xray/xray.odt
new file mode 100644
index 000000000..a7b1deee2
Binary files /dev/null and b/hermit/usr/xray/xray.odt differ
diff --git a/hermit/usr/xray/xray_priv.h b/hermit/usr/xray/xray_priv.h
new file mode 100644
index 000000000..714c91daa
--- /dev/null
+++ b/hermit/usr/xray/xray_priv.h
@@ -0,0 +1,207 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+/* XRay -- a simple profiler for Native Client */
+
+/* This header file is the private internal interface. */
+
+#ifndef LIBRARIES_XRAY_XRAY_PRIV_H_
+#define LIBRARIES_XRAY_XRAY_PRIV_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "xray/xray.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(XRAY)
+
+#define XRAY_FORCE_INLINE __attribute__((always_inline, no_instrument_function))
+
+#define XRAY_TRACE_STACK_SIZE (256)
+#define XRAY_TRACE_ANNOTATION_LENGTH (2048)
+#define XRAY_TRACE_BUFFER_SIZE (1048576)
+#define XRAY_ANNOTATION_STACK_SIZE ((XRAY_TRACE_STACK_SIZE) * \
+                                    (XRAY_TRACE_ANNOTATION_LENGTH))
+#define XRAY_STRING_POOL_NODE_SIZE (32768)
+#define XRAY_FRAME_MARKER (0xFFFFFFFF)
+#define XRAY_NULL_ANNOTATION (0x0)
+#define XRAY_FUNCTION_ALIGNMENT_BITS (4)
+#define XRAY_ADDR_MASK (0xFFFFFF00)
+#define XRAY_ADDR_SHIFT (4)
+#define XRAY_DEPTH_MASK (0x000000FF)
+#define XRAY_SYMBOL_TABLE_MAX_RATIO (0.66f)
+#define XRAY_LINE_SIZE (1024)
+#define XRAY_MAX_FRAMES (60)
+#define XRAY_MAX_LABEL (64)
+#define XRAY_DEFAULT_SYMBOL_TABLE_SIZE (4096)
+#define XRAY_SYMBOL_POOL_NODE_SIZE (1024)
+#define XRAY_GUARD_VALUE_0x12345678 (0x12345678)
+#define XRAY_GUARD_VALUE_0x87654321 (0x87654321)
+#define XRAY_EXTRACT_ADDR(x) (((x) & XRAY_ADDR_MASK) >> XRAY_ADDR_SHIFT)
+#define XRAY_EXTRACT_DEPTH(x) ((x) & XRAY_DEPTH_MASK)
+#define XRAY_PACK_ADDR(x) (((x) << XRAY_ADDR_SHIFT) & XRAY_ADDR_MASK)
+#define XRAY_PACK_DEPTH(x) ((x) & XRAY_DEPTH_MASK)
+#define XRAY_PACK_DEPTH_ADDR(d, a) (XRAY_PACK_DEPTH(d) | XRAY_PACK_ADDR(a))
+#define XRAY_ALIGN64 __attribute((aligned(64)))
+
+struct XRayStringPool;
+struct XRayHashTable;
+struct XRaySymbolPool;
+struct XRaySymbol;
+struct XRaySymbolTable;
+struct XRayTraceCapture;
+
+struct XRayTraceBufferEntry {
+  uint32_t depth_addr;
+  uint32_t annotation_index;
+  uint64_t start_tick;
+  uint64_t end_tick;
+};
+
+
+/* Important: don't instrument xray itself, so use       */
+/*            XRAY_NO_INSTRUMENT on all xray functions   */
+
+XRAY_NO_INSTRUMENT char* XRayStringPoolAppend(struct XRayStringPool* pool,
+  const char* src);
+XRAY_NO_INSTRUMENT struct XRayStringPool* XRayStringPoolCreate();
+XRAY_NO_INSTRUMENT void XRayStringPoolFree(struct XRayStringPool* pool);
+
+XRAY_NO_INSTRUMENT void* XRayHashTableLookup(struct XRayHashTable* table,
+    uint32_t addr);
+XRAY_NO_INSTRUMENT void* XRayHashTableInsert(struct XRayHashTable* table,
+    void* data, uint32_t addr);
+XRAY_NO_INSTRUMENT void* XRayHashTableAtIndex(
+  struct XRayHashTable* table, int i);
+XRAY_NO_INSTRUMENT int XRayHashTableGetCapacity(struct XRayHashTable* table);
+XRAY_NO_INSTRUMENT int XRayHashTableGetCount(struct XRayHashTable* table);
+XRAY_NO_INSTRUMENT struct XRayHashTable* XRayHashTableCreate(int capacity);
+XRAY_NO_INSTRUMENT void XRayHashTableFree(struct XRayHashTable* table);
+XRAY_NO_INSTRUMENT void XRayHashTableHisto(FILE* f);
+
+XRAY_NO_INSTRUMENT struct XRaySymbol* XRaySymbolPoolAlloc(
+    struct XRaySymbolPool* sympool);
+XRAY_NO_INSTRUMENT struct XRaySymbolPool* XRaySymbolPoolCreate();
+XRAY_NO_INSTRUMENT void XRaySymbolPoolFree(struct XRaySymbolPool* sympool);
+
+XRAY_NO_INSTRUMENT const char* XRayDemangle(char* demangle, size_t buffersize,
+    const char* symbol);
+
+XRAY_NO_INSTRUMENT const char* XRaySymbolGetName(struct XRaySymbol* symbol);
+XRAY_NO_INSTRUMENT struct XRaySymbol* XRaySymbolCreate(
+    struct XRaySymbolPool* sympool, const char* name);
+XRAY_NO_INSTRUMENT void XRaySymbolFree(struct XRaySymbol* symbol);
+XRAY_NO_INSTRUMENT int XRaySymbolCount(struct XRaySymbolTable* symtab);
+
+XRAY_NO_INSTRUMENT struct XRaySymbol* XRaySymbolTableCreateEntry(
+    struct XRaySymbolTable* symtab, char* line);
+XRAY_NO_INSTRUMENT void XRaySymbolTableParseMapfile(
+    struct XRaySymbolTable* symbols, const char* mapfilename);
+
+XRAY_NO_INSTRUMENT struct XRaySymbol* XRaySymbolTableAddByName(
+    struct XRaySymbolTable* symtab, const char* name, uint32_t addr);
+
+XRAY_NO_INSTRUMENT int XRaySymbolTableGetCount(struct XRaySymbolTable* symtab);
+XRAY_NO_INSTRUMENT struct XRaySymbol* XRaySymbolTableLookup(
+    struct XRaySymbolTable* symbols, uint32_t addr);
+XRAY_NO_INSTRUMENT struct XRaySymbol* XRaySymbolTableAtIndex(
+    struct XRaySymbolTable* symbols, int i);
+XRAY_NO_INSTRUMENT struct XRaySymbolTable* XRaySymbolTableCreate(int size);
+XRAY_NO_INSTRUMENT void XRaySymbolTableFree(struct XRaySymbolTable* symbtab);
+
+XRAY_NO_INSTRUMENT struct XRaySymbolTable* XRayGetSymbolTable(
+    struct XRayTraceCapture* capture);
+
+XRAY_NO_INSTRUMENT void XRayCheckGuards(struct XRayTraceCapture* capture);
+
+XRAY_NO_INSTRUMENT struct XRayTraceBufferEntry* XRayTraceGetEntry(
+    struct XRayTraceCapture* capture, int index);
+XRAY_NO_INSTRUMENT int XRayTraceIncrementIndex(
+    struct XRayTraceCapture* capture, int i);
+XRAY_NO_INSTRUMENT int XRayTraceDecrementIndex(
+    struct XRayTraceCapture* capture, int i);
+XRAY_NO_INSTRUMENT bool XRayTraceIsAnnotation(
+    struct XRayTraceCapture* capture, int index);
+XRAY_NO_INSTRUMENT void XRayTraceAppendString(
+    struct XRayTraceCapture* capture, char* src);
+XRAY_NO_INSTRUMENT int XRayTraceCopyToString(
+    struct XRayTraceCapture* capture, int index, char* dst);
+XRAY_NO_INSTRUMENT int XRayTraceSkipAnnotation(
+    struct XRayTraceCapture* capture, int index);
+XRAY_NO_INSTRUMENT int XRayTraceNextEntry(
+    struct XRayTraceCapture* capture, int index);
+
+XRAY_NO_INSTRUMENT void XRayFrameMakeLabel(struct XRayTraceCapture* capture,
+                                           int counter,
+                                           char* label);
+XRAY_NO_INSTRUMENT int XRayFrameFindTail(struct XRayTraceCapture* capture);
+
+XRAY_NO_INSTRUMENT int XRayFrameGetCount(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT int XRayFrameGetHead(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT int XRayFrameGetTail(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT int XRayFrameGetNext(
+    struct XRayTraceCapture* capture, int index);
+XRAY_NO_INSTRUMENT uint64_t XRayFrameGetTotalTicks(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT int XRayFrameGetTraceCount(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT int XRayFrameGetTraceStartIndex(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT int XRayFrameGetTraceEndIndex(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT int XRayFrameGetAnnotationCount(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT bool XRayFrameIsValid(
+    struct XRayTraceCapture* capture, int frame);
+
+
+XRAY_NO_INSTRUMENT void XRayTraceReport(struct XRayTraceCapture* capture,
+                                        FILE* f,
+                                        int frame,
+                                        char* label,
+                                        float percent_cutoff,
+                                        int ticks_cutoff);
+XRAY_NO_INSTRUMENT void XRayFrameReport(struct XRayTraceCapture* capture,
+                                        FILE* f);
+
+XRAY_NO_INSTRUMENT void* XRayMalloc(size_t t);
+XRAY_NO_INSTRUMENT void XRayFree(void* data);
+
+XRAY_NO_INSTRUMENT void XRaySetMaxStackDepth(
+    struct XRayTraceCapture* capture, int stack_depth);
+XRAY_NO_INSTRUMENT int XRayGetLastFrame(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRayDisableCapture(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRayEnableCapture(struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT void XRayLoadMapfile(
+    struct XRayTraceCapture* capture, const char* mapfilename);
+
+struct XRayTimestampPair {
+  uint64_t xray;   /* internal xray timestamp */
+  int64_t pepper;  /* corresponding timestamp from PPAPI interface */
+};
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+XRAY_NO_INSTRUMENT void XRayGetTSC(uint64_t* tsc);
+XRAY_NO_INSTRUMENT int32_t XRayGetSavedThreadID(
+    struct XRayTraceCapture* capture);
+XRAY_NO_INSTRUMENT struct XRayTimestampPair XRayFrameGetStartTimestampPair(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT struct XRayTimestampPair XRayFrameGetEndTimestampPair(
+    struct XRayTraceCapture* capture, int frame);
+XRAY_NO_INSTRUMENT struct XRayTimestampPair XRayGenerateTimestampsNow(void);
+#endif
+
+
+#endif  /* defined(XRAY) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* LIBRARIES_XRAY_XRAY_PRIV_H_ */