[PATCH] D22993: [MSAN][MIPS] Changed memory mapping to support pie executable.

[Sagar Thakur via llvm-commits]

slthakur created this revision.
slthakur added reviewers: eugenis, kcc, samsonov.
slthakur added subscribers: mohit.bhakkad, jaydeep, llvm-commits.
slthakur set the repository for this revision to rL LLVM.
slthakur added a project: Sanitizers.

Repository:
  rL LLVM

https://reviews.llvm.org/D22993

Files:
  lib/msan/msan.h
  test/msan/mmap.cc
  test/msan/strlen_of_shadow.cc

Index: test/msan/strlen_of_shadow.cc
===================================================================
--- test/msan/strlen_of_shadow.cc
+++ test/msan/strlen_of_shadow.cc
@@ -14,7 +14,7 @@
 #if defined(__x86_64__)
   return (char *)((uintptr_t)p ^ 0x500000000000ULL);
 #elif defined (__mips64)
-  return (char *)((uintptr_t)p & ~0x4000000000ULL);
+  return (char *)((uintptr_t)p ^ 0x8000000000ULL);
 #elif defined(__powerpc64__)
 #define LINEARIZE_MEM(mem) \
   (((uintptr_t)(mem) & ~0x200000000000ULL) ^ 0x100000000000ULL)
Index: test/msan/mmap.cc
===================================================================
--- test/msan/mmap.cc
+++ test/msan/mmap.cc
@@ -19,7 +19,8 @@
          (addr >= 0x510000000000ULL && addr < 0x600000000000ULL) ||
          (addr >= 0x700000000000ULL && addr < 0x800000000000ULL);
 #elif defined(__mips64)
-  return addr >= 0x00e000000000ULL;
+  return addr >= 0x00e000000000ULL ||
+         addr >= 0x00a000000000ULL && addr <= 0x00c000000000ULL;
 #elif defined(__powerpc64__)
   return addr < 0x000100000000ULL || addr >= 0x300000000000ULL;
 #elif defined(__aarch64__)
Index: lib/msan/msan.h
===================================================================
--- lib/msan/msan.h
+++ lib/msan/msan.h
@@ -42,14 +42,21 @@
 
 #if SANITIZER_LINUX && defined(__mips64)
 
-// Everything is above 0x00e000000000.
+// MIPS64 maps:
+// - 0x0100000000-0x0200000000: Program own segments
+// - 0xa000000000-0xc000000000: PIE program segments
+// - 0xe000000000-0xffffffffff: libraries segments.
 const MappingDesc kMemoryLayout[] = {
-    {0x000000000000ULL, 0x00a000000000ULL, MappingDesc::INVALID, "invalid"},
-    {0x00a000000000ULL, 0x00c000000000ULL, MappingDesc::SHADOW, "shadow"},
-    {0x00c000000000ULL, 0x00e000000000ULL, MappingDesc::ORIGIN, "origin"},
-    {0x00e000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app"}};
-
-#define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x4000000000ULL)
+    {0x000000000000ULL, 0x002000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x002000000000ULL, 0x004000000000ULL, MappingDesc::SHADOW, "shadow-1"},
+    {0x004000000000ULL, 0x006000000000ULL, MappingDesc::ORIGIN, "origin-1"},
+    {0x006000000000ULL, 0x008000000000ULL, MappingDesc::SHADOW, "shadow-2"},
+    {0x008000000000ULL, 0x00a000000000ULL, MappingDesc::ORIGIN, "origin-2"},
+    {0x00a000000000ULL, 0x00c000000000ULL, MappingDesc::APP, "app-1"},
+    {0x00c000000000ULL, 0x00e000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x00e000000000ULL, 0x00ffffffffffULL, MappingDesc::APP, "app-2"}};
+
+#define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x8000000000ULL)
 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x002000000000)
 
 #elif SANITIZER_LINUX && defined(__aarch64__)


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D22993.66223.patch
Type: text/x-patch
Size: 2723 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20160730/8b9071e1/attachment.bin>