Initial checkin

BeefRT/gperftools/src/malloc_hook_mmap_freebsd.h

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+// Copyright (c) 2011, Google Inc.
+// 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.
+
+// Override mmap/munmap/mremap/sbrk to provide support for calling the
+// related hooks (in addition, of course, to doing what these
+// functions normally do).
+
+#ifndef __FreeBSD__
+# error Should only be including malloc_hook_mmap_freebsd.h on FreeBSD systems.
+#endif
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+#include <errno.h>
+
+// Make sure mmap doesn't get #define'd away by <sys/mman.h>
+#undef mmap
+
+// According to the FreeBSD documentation, use syscall if you do not
+// need 64-bit alignment otherwise use __syscall. Indeed, syscall
+// doesn't work correctly in most situations on 64-bit. It's return
+// type is 'int' so for things like SYS_mmap, it actually truncates
+// the returned address to 32-bits.
+#if defined(__amd64__) || defined(__x86_64__)
+# define MALLOC_HOOK_SYSCALL __syscall
+#else
+# define MALLOC_HOOK_SYSCALL syscall
+#endif
+
+
+extern "C" {
+  void* mmap(void *start, size_t length,int prot, int flags,
+             int fd, off_t offset) __THROW
+    ATTRIBUTE_SECTION(malloc_hook);
+  int munmap(void* start, size_t length) __THROW
+    ATTRIBUTE_SECTION(malloc_hook);
+  void* sbrk(intptr_t increment) __THROW
+    ATTRIBUTE_SECTION(malloc_hook);
+}
+
+static inline void* do_mmap(void *start, size_t length,
+                            int prot, int flags,
+                            int fd, off_t offset) __THROW {
+  return (void *)MALLOC_HOOK_SYSCALL(SYS_mmap,
+                                     start, length, prot, flags, fd, offset);
+}
+
+static inline void* do_sbrk(intptr_t increment) {
+  void* curbrk = 0;
+
+#if defined(__x86_64__) || defined(__amd64__)
+# ifdef PIC
+  __asm__ __volatile__(
+      "movq .curbrk@GOTPCREL(%%rip), %%rdx;"
+      "movq (%%rdx), %%rax;"
+      "movq %%rax, %0;"
+      : "=r" (curbrk)
+      :: "%rdx", "%rax");
+# else
+  __asm__ __volatile__(
+      "movq .curbrk(%%rip), %%rax;"
+      "movq %%rax, %0;"
+      : "=r" (curbrk)
+      :: "%rax");
+# endif
+#else
+  __asm__ __volatile__(
+      "movl .curbrk, %%eax;"
+      "movl %%eax, %0;"
+      : "=r" (curbrk)
+      :: "%eax");
+#endif
+
+  if (increment == 0) {
+    return curbrk;
+  }
+
+  char* prevbrk = static_cast<char*>(curbrk);
+  void* newbrk = prevbrk + increment;
+
+  if (brk(newbrk) == -1) {
+    return reinterpret_cast<void*>(static_cast<intptr_t>(-1));
+  }
+
+  return prevbrk;
+}
+
+
+extern "C" void* mmap(void *start, size_t length, int prot, int flags,
+                      int fd, off_t offset) __THROW {
+  MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset);
+  void *result;
+  if (!MallocHook::InvokeMmapReplacement(
+          start, length, prot, flags, fd, offset, &result)) {
+    result = do_mmap(start, length, prot, flags, fd,
+                       static_cast<size_t>(offset)); // avoid sign extension
+  }
+  MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset);
+  return result;
+}
+
+extern "C" int munmap(void* start, size_t length) __THROW {
+  MallocHook::InvokeMunmapHook(start, length);
+  int result;
+  if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
+    result = MALLOC_HOOK_SYSCALL(SYS_munmap, start, length);
+  }
+
+  return result;
+}
+
+extern "C" void* sbrk(intptr_t increment) __THROW {
+  MallocHook::InvokePreSbrkHook(increment);
+  void *result = do_sbrk(increment);
+  MallocHook::InvokeSbrkHook(result, increment);
+  return result;
+}
+
+/*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot,
+                                         int flags, int fd, off_t offset) {
+  void* result;
+  if (!MallocHook::InvokeMmapReplacement(
+	  start, length, prot, flags, fd, offset, &result)) {
+    result = do_mmap(start, length, prot, flags, fd, offset);
+  }
+
+  return result;
+}
+
+/*static*/int MallocHook::UnhookedMUnmap(void *start, size_t length) {
+  int result;
+  if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
+    result = MALLOC_HOOK_SYSCALL(SYS_munmap, start, length);
+  }
+  return result;
+}
+
+#undef MALLOC_HOOK_SYSCALL