Vendor import of compiler-rt trunk r307894:vendor/compiler-rt/compiler-rt-trunk-r307894

https://llvm.org/svn/llvm-project/compiler-rt/trunk@307894

1 files changed, 18 insertions, 101 deletions

diff --git a/lib/sanitizer_common/sanitizer_posix.cc b/lib/sanitizer_common/sanitizer_posix.cc
index 63f1bf713b24..8d3128ae199d 100644
--- a/lib/sanitizer_common/sanitizer_posix.cc
+++ b/lib/sanitizer_common/sanitizer_posix.cc
@@ -27,14 +27,6 @@
 #include <signal.h>
 #include <sys/mman.h>
 
-#if SANITIZER_LINUX
-#include <sys/utsname.h>
-#endif
-
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
-#include <sys/personality.h>
-#endif
-
 #if SANITIZER_FREEBSD
 // The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
 // that, it was never implemented.  So just define it to zero.
@@ -49,80 +41,6 @@ uptr GetMmapGranularity() {
   return GetPageSize();
 }
 
-#if SANITIZER_WORDSIZE == 32
-// Take care of unusable kernel area in top gigabyte.
-static uptr GetKernelAreaSize() {
-#if SANITIZER_LINUX && !SANITIZER_X32
-  const uptr gbyte = 1UL << 30;
-
-  // Firstly check if there are writable segments
-  // mapped to top gigabyte (e.g. stack).
-  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
-  uptr end, prot;
-  while (proc_maps.Next(/*start*/nullptr, &end,
-                        /*offset*/nullptr, /*filename*/nullptr,
-                        /*filename_size*/0, &prot)) {
-    if ((end >= 3 * gbyte)
-        && (prot & MemoryMappingLayout::kProtectionWrite) != 0)
-      return 0;
-  }
-
-#if !SANITIZER_ANDROID
-  // Even if nothing is mapped, top Gb may still be accessible
-  // if we are running on 64-bit kernel.
-  // Uname may report misleading results if personality type
-  // is modified (e.g. under schroot) so check this as well.
-  struct utsname uname_info;
-  int pers = personality(0xffffffffUL);
-  if (!(pers & PER_MASK)
-      && uname(&uname_info) == 0
-      && internal_strstr(uname_info.machine, "64"))
-    return 0;
-#endif  // SANITIZER_ANDROID
-
-  // Top gigabyte is reserved for kernel.
-  return gbyte;
-#else
-  return 0;
-#endif  // SANITIZER_LINUX && !SANITIZER_X32
-}
-#endif  // SANITIZER_WORDSIZE == 32
-
-uptr GetMaxVirtualAddress() {
-#if SANITIZER_WORDSIZE == 64
-# if defined(__aarch64__) && SANITIZER_IOS && !SANITIZER_IOSSIM
-  // Ideally, we would derive the upper bound from MACH_VM_MAX_ADDRESS. The
-  // upper bound can change depending on the device.
-  return 0x200000000 - 1;
-# elif defined(__powerpc64__) || defined(__aarch64__)
-  // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
-  // We somehow need to figure out which one we are using now and choose
-  // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
-  // Note that with 'ulimit -s unlimited' the stack is moved away from the top
-  // of the address space, so simply checking the stack address is not enough.
-  // This should (does) work for both PowerPC64 Endian modes.
-  // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
-  return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
-# elif defined(__mips64)
-  return (1ULL << 40) - 1;  // 0x000000ffffffffffUL;
-# elif defined(__s390x__)
-  return (1ULL << 53) - 1;  // 0x001fffffffffffffUL;
-# else
-  return (1ULL << 47) - 1;  // 0x00007fffffffffffUL;
-# endif
-#else  // SANITIZER_WORDSIZE == 32
-# if defined(__s390__)
-  return (1ULL << 31) - 1;  // 0x7fffffff;
-# else
-  uptr res = (1ULL << 32) - 1;  // 0xffffffff;
-  if (!common_flags()->full_address_space)
-    res -= GetKernelAreaSize();
-  CHECK_LT(reinterpret_cast<uptr>(&res), res);
-  return res;
-# endif
-#endif  // SANITIZER_WORDSIZE
-}
-
 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
   size = RoundUpTo(size, GetPageSizeCached());
   uptr res = internal_mmap(nullptr, size,
@@ -162,7 +80,7 @@ void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
 }
 
 // We want to map a chunk of address space aligned to 'alignment'.
-// We do it by maping a bit more and then unmaping redundant pieces.
+// We do it by mapping a bit more and then unmapping redundant pieces.
 // We probably can do it with fewer syscalls in some OS-dependent way.
 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
                                    const char *mem_type) {
@@ -313,13 +231,12 @@ static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
 // memory).
 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
   MemoryMappingLayout proc_maps(/*cache_enabled*/true);
-  uptr start, end;
-  while (proc_maps.Next(&start, &end,
-                        /*offset*/nullptr, /*filename*/nullptr,
-                        /*filename_size*/0, /*protection*/nullptr)) {
-    if (start == end) continue;  // Empty range.
-    CHECK_NE(0, end);
-    if (!IntervalsAreSeparate(start, end - 1, range_start, range_end))
+  MemoryMappedSegment segment;
+  while (proc_maps.Next(&segment)) {
+    if (segment.start == segment.end) continue;  // Empty range.
+    CHECK_NE(0, segment.end);
+    if (!IntervalsAreSeparate(segment.start, segment.end - 1, range_start,
+                              range_end))
       return false;
   }
   return true;
@@ -327,13 +244,13 @@ bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 
 void DumpProcessMap() {
   MemoryMappingLayout proc_maps(/*cache_enabled*/true);
-  uptr start, end;
   const sptr kBufSize = 4095;
   char *filename = (char*)MmapOrDie(kBufSize, __func__);
+  MemoryMappedSegment segment(filename, kBufSize);
   Report("Process memory map follows:\n");
-  while (proc_maps.Next(&start, &end, /* file_offset */nullptr,
-                        filename, kBufSize, /* protection */nullptr)) {
-    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
+  while (proc_maps.Next(&segment)) {
+    Printf("\t%p-%p\t%s\n", (void *)segment.start, (void *)segment.end,
+           segment.filename);
   }
   Report("End of process memory map.\n");
   UnmapOrDie(filename, kBufSize);
@@ -363,14 +280,14 @@ void ReportFile::Write(const char *buffer, uptr length) {
 }
 
 bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end) {
-  uptr s, e, off, prot;
-  InternalScopedString buff(kMaxPathLength);
   MemoryMappingLayout proc_maps(/*cache_enabled*/false);
-  while (proc_maps.Next(&s, &e, &off, buff.data(), buff.size(), &prot)) {
-    if ((prot & MemoryMappingLayout::kProtectionExecute) != 0
-        && internal_strcmp(module, buff.data()) == 0) {
-      *start = s;
-      *end = e;
+  InternalScopedString buff(kMaxPathLength);
+  MemoryMappedSegment segment(buff.data(), kMaxPathLength);
+  while (proc_maps.Next(&segment)) {
+    if (segment.IsExecutable() &&
+        internal_strcmp(module, segment.filename) == 0) {
+      *start = segment.start;
+      *end = segment.end;
       return true;
     }
   }