diff --git a/libbacktrace/UnwindStack.cpp b/libbacktrace/UnwindStack.cpp
index 4e7f761..fe28eba 100644
--- a/libbacktrace/UnwindStack.cpp
+++ b/libbacktrace/UnwindStack.cpp
@@ -49,6 +49,7 @@
   unwindstack::Unwinder unwinder(MAX_BACKTRACE_FRAMES + num_ignore_frames, stack_map->stack_maps(),
                                  regs, stack_map->process_memory());
   unwinder.SetResolveNames(stack_map->ResolveNames());
+  stack_map->SetArch(regs->Arch());
   if (stack_map->GetJitDebug() != nullptr) {
     unwinder.SetJitDebug(stack_map->GetJitDebug(), regs->Arch());
   }
diff --git a/libbacktrace/UnwindStackMap.cpp b/libbacktrace/UnwindStackMap.cpp
index 52dd441..9d15af2 100644
--- a/libbacktrace/UnwindStackMap.cpp
+++ b/libbacktrace/UnwindStackMap.cpp
@@ -25,6 +25,7 @@
 #include <unwindstack/Elf.h>
 #include <unwindstack/MapInfo.h>
 #include <unwindstack/Maps.h>
+#include <unwindstack/Regs.h>
 
 #include "UnwindStackMap.h"
 
@@ -106,7 +107,17 @@
     return "";
   }
 
-  unwindstack::Elf* elf = map_info->GetElf(process_memory());
+  if (arch_ == unwindstack::ARCH_UNKNOWN) {
+    if (pid_ == getpid()) {
+      arch_ = unwindstack::Regs::CurrentArch();
+    } else {
+      // Create a remote regs, to figure out the architecture.
+      std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::RemoteGet(pid_));
+      arch_ = regs->Arch();
+    }
+  }
+
+  unwindstack::Elf* elf = map_info->GetElf(process_memory(), arch_);
 
   std::string name;
   uint64_t func_offset;
diff --git a/libbacktrace/UnwindStackMap.h b/libbacktrace/UnwindStackMap.h
index 039f4a2..e19b605 100644
--- a/libbacktrace/UnwindStackMap.h
+++ b/libbacktrace/UnwindStackMap.h
@@ -30,6 +30,7 @@
 #if !defined(NO_LIBDEXFILE_SUPPORT)
 #include <unwindstack/DexFiles.h>
 #endif
+#include <unwindstack/Elf.h>
 #include <unwindstack/JitDebug.h>
 #include <unwindstack/Maps.h>
 
@@ -58,6 +59,8 @@
   unwindstack::DexFiles* GetDexFiles() { return dex_files_.get(); }
 #endif
 
+  void SetArch(unwindstack::ArchEnum arch) { arch_ = arch; }
+
  protected:
   uint64_t GetLoadBias(size_t index) override;
 
@@ -67,6 +70,8 @@
 #if !defined(NO_LIBDEXFILE_SUPPORT)
   std::unique_ptr<unwindstack::DexFiles> dex_files_;
 #endif
+
+  unwindstack::ArchEnum arch_ = unwindstack::ARCH_UNKNOWN;
 };
 
 class UnwindStackOfflineMap : public UnwindStackMap {
diff --git a/libunwindstack/DexFiles.cpp b/libunwindstack/DexFiles.cpp
index ac55fee..451a0b9 100644
--- a/libunwindstack/DexFiles.cpp
+++ b/libunwindstack/DexFiles.cpp
@@ -54,8 +54,8 @@
   }
 }
 
-void DexFiles::SetArch(ArchEnum arch) {
-  switch (arch) {
+void DexFiles::ProcessArch() {
+  switch (arch()) {
     case ARCH_ARM:
     case ARCH_MIPS:
     case ARCH_X86:
diff --git a/libunwindstack/Elf.cpp b/libunwindstack/Elf.cpp
index 60ef796..4d72ead 100644
--- a/libunwindstack/Elf.cpp
+++ b/libunwindstack/Elf.cpp
@@ -88,6 +88,11 @@
   }
 }
 
+void Elf::Invalidate() {
+  interface_.reset(nullptr);
+  valid_ = false;
+}
+
 bool Elf::GetSoname(std::string* name) {
   std::lock_guard<std::mutex> guard(lock_);
   return valid_ && interface_->GetSoname(name);
diff --git a/libunwindstack/Global.cpp b/libunwindstack/Global.cpp
index f0ad2b6..7a3de01 100644
--- a/libunwindstack/Global.cpp
+++ b/libunwindstack/Global.cpp
@@ -31,6 +31,13 @@
 Global::Global(std::shared_ptr<Memory>& memory, std::vector<std::string>& search_libs)
     : memory_(memory), search_libs_(search_libs) {}
 
+void Global::SetArch(ArchEnum arch) {
+  if (arch_ == ARCH_UNKNOWN) {
+    arch_ = arch;
+    ProcessArch();
+  }
+}
+
 uint64_t Global::GetVariableOffset(MapInfo* info, const std::string& variable) {
   if (!search_libs_.empty()) {
     bool found = false;
@@ -46,7 +53,7 @@
     }
   }
 
-  Elf* elf = info->GetElf(memory_);
+  Elf* elf = info->GetElf(memory_, arch());
   uint64_t ptr;
   // Find first non-empty list (libraries might be loaded multiple times).
   if (elf->GetGlobalVariable(variable, &ptr) && ptr != 0) {
diff --git a/libunwindstack/JitDebug.cpp b/libunwindstack/JitDebug.cpp
index d6af49e..20bc4b9 100644
--- a/libunwindstack/JitDebug.cpp
+++ b/libunwindstack/JitDebug.cpp
@@ -141,8 +141,8 @@
   return code.next;
 }
 
-void JitDebug::SetArch(ArchEnum arch) {
-  switch (arch) {
+void JitDebug::ProcessArch() {
+  switch (arch()) {
     case ARCH_X86:
       read_descriptor_func_ = &JitDebug::ReadDescriptor32;
       read_entry_func_ = &JitDebug::ReadEntry32Pack;
diff --git a/libunwindstack/LocalUnwinder.cpp b/libunwindstack/LocalUnwinder.cpp
index 31337a9..5b2fadf 100644
--- a/libunwindstack/LocalUnwinder.cpp
+++ b/libunwindstack/LocalUnwinder.cpp
@@ -88,6 +88,7 @@
 bool LocalUnwinder::Unwind(std::vector<LocalFrameData>* frame_info, size_t max_frames) {
   std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromLocal());
   unwindstack::RegsGetLocal(regs.get());
+  ArchEnum arch = regs->Arch();
 
   size_t num_frames = 0;
   bool adjust_pc = false;
@@ -100,7 +101,7 @@
       break;
     }
 
-    Elf* elf = map_info->GetElf(process_memory_);
+    Elf* elf = map_info->GetElf(process_memory_, arch);
     uint64_t rel_pc = elf->GetRelPc(cur_pc, map_info);
     uint64_t step_pc = rel_pc;
     uint64_t pc_adjustment;
diff --git a/libunwindstack/MapInfo.cpp b/libunwindstack/MapInfo.cpp
index 8527797..fe32b5e 100644
--- a/libunwindstack/MapInfo.cpp
+++ b/libunwindstack/MapInfo.cpp
@@ -146,7 +146,7 @@
   return nullptr;
 }
 
-Elf* MapInfo::GetElf(const std::shared_ptr<Memory>& process_memory) {
+Elf* MapInfo::GetElf(const std::shared_ptr<Memory>& process_memory, ArchEnum expected_arch) {
   // Make sure no other thread is trying to add the elf to this map.
   std::lock_guard<std::mutex> guard(mutex_);
 
@@ -176,6 +176,10 @@
   // If the init fails, keep the elf around as an invalid object so we
   // don't try to reinit the object.
   elf->Init();
+  if (elf->valid() && expected_arch != elf->arch()) {
+    // Make the elf invalid, mismatch between arch and expected arch.
+    elf->Invalidate();
+  }
 
   if (locked) {
     Elf::CacheAdd(this);
diff --git a/libunwindstack/Unwinder.cpp b/libunwindstack/Unwinder.cpp
index b8b0ac6..b3c5549 100644
--- a/libunwindstack/Unwinder.cpp
+++ b/libunwindstack/Unwinder.cpp
@@ -135,6 +135,8 @@
   last_error_.code = ERROR_NONE;
   last_error_.address = 0;
 
+  ArchEnum arch = regs_->Arch();
+
   bool return_address_attempt = false;
   bool adjust_pc = false;
   std::unique_ptr<JitDebug> jit_debug;
@@ -155,7 +157,7 @@
       if (ShouldStop(map_suffixes_to_ignore, map_info->name)) {
         break;
       }
-      elf = map_info->GetElf(process_memory_);
+      elf = map_info->GetElf(process_memory_, arch);
       step_pc = regs_->pc();
       rel_pc = elf->GetRelPc(step_pc, map_info);
       // Everyone except elf data in gdb jit debug maps uses the relative pc.
diff --git a/libunwindstack/include/unwindstack/DexFiles.h b/libunwindstack/include/unwindstack/DexFiles.h
index c2fde74..c202a33 100644
--- a/libunwindstack/include/unwindstack/DexFiles.h
+++ b/libunwindstack/include/unwindstack/DexFiles.h
@@ -47,8 +47,6 @@
   void GetMethodInformation(Maps* maps, MapInfo* info, uint64_t dex_pc, std::string* method_name,
                             uint64_t* method_offset);
 
-  void SetArch(ArchEnum arch);
-
  private:
   void Init(Maps* maps);
 
@@ -64,6 +62,8 @@
 
   bool ReadVariableData(uint64_t ptr_offset) override;
 
+  void ProcessArch() override;
+
   std::mutex lock_;
   bool initialized_ = false;
   std::unordered_map<uint64_t, DexFile*> files_;
diff --git a/libunwindstack/include/unwindstack/Elf.h b/libunwindstack/include/unwindstack/Elf.h
index 24cabf2..e5b0a89 100644
--- a/libunwindstack/include/unwindstack/Elf.h
+++ b/libunwindstack/include/unwindstack/Elf.h
@@ -57,6 +57,8 @@
 
   void InitGnuDebugdata();
 
+  void Invalidate();
+
   bool GetSoname(std::string* name);
 
   bool GetFunctionName(uint64_t addr, std::string* name, uint64_t* func_offset);
diff --git a/libunwindstack/include/unwindstack/Global.h b/libunwindstack/include/unwindstack/Global.h
index 70e3ddd..a7e6c15 100644
--- a/libunwindstack/include/unwindstack/Global.h
+++ b/libunwindstack/include/unwindstack/Global.h
@@ -25,6 +25,7 @@
 #include <unordered_map>
 #include <vector>
 
+#include <unwindstack/Elf.h>
 #include <unwindstack/Memory.h>
 
 namespace unwindstack {
@@ -39,12 +40,20 @@
   Global(std::shared_ptr<Memory>& memory, std::vector<std::string>& search_libs);
   virtual ~Global() = default;
 
+  void SetArch(ArchEnum arch);
+
+  ArchEnum arch() { return arch_; }
+
  protected:
   uint64_t GetVariableOffset(MapInfo* info, const std::string& variable);
   void FindAndReadVariable(Maps* maps, const char* variable);
 
   virtual bool ReadVariableData(uint64_t offset) = 0;
 
+  virtual void ProcessArch() = 0;
+
+  ArchEnum arch_ = ARCH_UNKNOWN;
+
   std::shared_ptr<Memory> memory_;
   std::vector<std::string> search_libs_;
 };
diff --git a/libunwindstack/include/unwindstack/JitDebug.h b/libunwindstack/include/unwindstack/JitDebug.h
index ccb473f..f64b04f 100644
--- a/libunwindstack/include/unwindstack/JitDebug.h
+++ b/libunwindstack/include/unwindstack/JitDebug.h
@@ -42,17 +42,9 @@
 
   Elf* GetElf(Maps* maps, uint64_t pc);
 
-  void SetArch(ArchEnum arch);
-
  private:
   void Init(Maps* maps);
 
-  uint64_t entry_addr_ = 0;
-  bool initialized_ = false;
-  std::vector<Elf*> elf_list_;
-
-  std::mutex lock_;
-
   uint64_t (JitDebug::*read_descriptor_func_)(uint64_t) = nullptr;
   uint64_t (JitDebug::*read_entry_func_)(uint64_t*, uint64_t*) = nullptr;
 
@@ -64,6 +56,14 @@
   uint64_t ReadEntry64(uint64_t* start, uint64_t* size);
 
   bool ReadVariableData(uint64_t ptr_offset) override;
+
+  void ProcessArch() override;
+
+  uint64_t entry_addr_ = 0;
+  bool initialized_ = false;
+  std::vector<Elf*> elf_list_;
+
+  std::mutex lock_;
 };
 
 }  // namespace unwindstack
diff --git a/libunwindstack/include/unwindstack/MapInfo.h b/libunwindstack/include/unwindstack/MapInfo.h
index ff634f2..9c6b552 100644
--- a/libunwindstack/include/unwindstack/MapInfo.h
+++ b/libunwindstack/include/unwindstack/MapInfo.h
@@ -72,7 +72,7 @@
   std::atomic_uint64_t load_bias;
 
   // This function guarantees it will never return nullptr.
-  Elf* GetElf(const std::shared_ptr<Memory>& process_memory);
+  Elf* GetElf(const std::shared_ptr<Memory>& process_memory, ArchEnum expected_arch);
 
   uint64_t GetLoadBias(const std::shared_ptr<Memory>& process_memory);
 
diff --git a/libunwindstack/tests/DexFilesTest.cpp b/libunwindstack/tests/DexFilesTest.cpp
index 3ac3ca6..1ea9e5c 100644
--- a/libunwindstack/tests/DexFilesTest.cpp
+++ b/libunwindstack/tests/DexFilesTest.cpp
@@ -36,12 +36,20 @@
 
 class DexFilesTest : public ::testing::Test {
  protected:
-  void SetUp() override {
-    memory_ = new MemoryFake;
-    process_memory_.reset(memory_);
+  void CreateFakeElf(MapInfo* map_info) {
+    MemoryFake* memory = new MemoryFake;
+    ElfFake* elf = new ElfFake(memory);
+    elf->FakeSetValid(true);
+    ElfInterfaceFake* interface = new ElfInterfaceFake(memory);
+    elf->FakeSetInterface(interface);
 
+    interface->FakeSetGlobalVariable("__dex_debug_descriptor", 0x800);
+    map_info->elf.reset(elf);
+  }
+
+  void Init(ArchEnum arch) {
     dex_files_.reset(new DexFiles(process_memory_));
-    dex_files_->SetArch(ARCH_ARM);
+    dex_files_->SetArch(arch);
 
     maps_.reset(
         new BufferMaps("1000-4000 ---s 00000000 00:00 0 /fake/elf\n"
@@ -58,35 +66,24 @@
     // Global variable in a section that is not readable.
     MapInfo* map_info = maps_->Get(kMapGlobalNonReadable);
     ASSERT_TRUE(map_info != nullptr);
-    MemoryFake* memory = new MemoryFake;
-    ElfFake* elf = new ElfFake(memory);
-    elf->FakeSetValid(true);
-    ElfInterfaceFake* interface = new ElfInterfaceFake(memory);
-    elf->FakeSetInterface(interface);
-    interface->FakeSetGlobalVariable("__dex_debug_descriptor", 0x800);
-    map_info->elf.reset(elf);
+    CreateFakeElf(map_info);
 
     // Global variable not set by default.
     map_info = maps_->Get(kMapGlobalSetToZero);
     ASSERT_TRUE(map_info != nullptr);
-    memory = new MemoryFake;
-    elf = new ElfFake(memory);
-    elf->FakeSetValid(true);
-    interface = new ElfInterfaceFake(memory);
-    elf->FakeSetInterface(interface);
-    interface->FakeSetGlobalVariable("__dex_debug_descriptor", 0x800);
-    map_info->elf.reset(elf);
+    CreateFakeElf(map_info);
 
     // Global variable set in this map.
     map_info = maps_->Get(kMapGlobal);
     ASSERT_TRUE(map_info != nullptr);
-    memory = new MemoryFake;
-    elf = new ElfFake(memory);
-    elf->FakeSetValid(true);
-    interface = new ElfInterfaceFake(memory);
-    elf->FakeSetInterface(interface);
-    interface->FakeSetGlobalVariable("__dex_debug_descriptor", 0x800);
-    map_info->elf.reset(elf);
+    CreateFakeElf(map_info);
+  }
+
+  void SetUp() override {
+    memory_ = new MemoryFake;
+    process_memory_.reset(memory_);
+
+    Init(ARCH_ARM);
   }
 
   void WriteDescriptor32(uint64_t addr, uint32_t head);
@@ -169,11 +166,12 @@
 }
 
 TEST_F(DexFilesTest, get_method_information_64) {
+  Init(ARCH_ARM64);
+
   std::string method_name = "nothing";
   uint64_t method_offset = 0x124;
   MapInfo* info = maps_->Get(kMapDexFiles);
 
-  dex_files_->SetArch(ARCH_ARM64);
   WriteDescriptor64(0xf800, 0x200000);
   WriteEntry64(0x200000, 0, 0, 0x301000);
   WriteDex(0x301000);
@@ -199,11 +197,12 @@
 }
 
 TEST_F(DexFilesTest, get_method_information_not_first_entry_64) {
+  Init(ARCH_ARM64);
+
   std::string method_name = "nothing";
   uint64_t method_offset = 0x124;
   MapInfo* info = maps_->Get(kMapDexFiles);
 
-  dex_files_->SetArch(ARCH_ARM64);
   WriteDescriptor64(0xf800, 0x200000);
   WriteEntry64(0x200000, 0x200100, 0, 0x100000);
   WriteEntry64(0x200100, 0, 0x200000, 0x300000);
@@ -297,6 +296,8 @@
 }
 
 TEST_F(DexFilesTest, get_method_information_global_skip_zero_64) {
+  Init(ARCH_ARM64);
+
   std::string method_name = "nothing";
   uint64_t method_offset = 0x124;
   MapInfo* info = maps_->Get(kMapDexFiles);
@@ -308,7 +309,6 @@
   WriteEntry64(0x200000, 0, 0, 0x300000);
   WriteDex(0x300000);
 
-  dex_files_->SetArch(ARCH_ARM64);
   dex_files_->GetMethodInformation(maps_.get(), info, 0x300100, &method_name, &method_offset);
   EXPECT_EQ("Main.<init>", method_name);
   EXPECT_EQ(0U, method_offset);
diff --git a/libunwindstack/tests/ElfCacheTest.cpp b/libunwindstack/tests/ElfCacheTest.cpp
index 8ed697c..d9acdec 100644
--- a/libunwindstack/tests/ElfCacheTest.cpp
+++ b/libunwindstack/tests/ElfCacheTest.cpp
@@ -82,9 +82,9 @@
   MapInfo info1(nullptr, start, end, 0, 0x5, tf.path);
   MapInfo info2(nullptr, start, end, 0, 0x5, tf.path);
 
-  Elf* elf1 = info1.GetElf(memory_);
+  Elf* elf1 = info1.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf1->valid());
-  Elf* elf2 = info2.GetElf(memory_);
+  Elf* elf2 = info2.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf2->valid());
 
   if (cache_enabled) {
@@ -132,10 +132,10 @@
   MapInfo info300_1(nullptr, start, end, 0x300, 0x5, tf.path);
   MapInfo info300_2(nullptr, start, end, 0x300, 0x5, tf.path);
 
-  Elf* elf0_1 = info0_1.GetElf(memory_);
+  Elf* elf0_1 = info0_1.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf0_1->valid());
   EXPECT_EQ(ARCH_ARM, elf0_1->arch());
-  Elf* elf0_2 = info0_2.GetElf(memory_);
+  Elf* elf0_2 = info0_2.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf0_2->valid());
   EXPECT_EQ(ARCH_ARM, elf0_2->arch());
   EXPECT_EQ(0U, info0_1.elf_offset);
@@ -146,10 +146,10 @@
     EXPECT_NE(elf0_1, elf0_2);
   }
 
-  Elf* elf100_1 = info100_1.GetElf(memory_);
+  Elf* elf100_1 = info100_1.GetElf(memory_, ARCH_X86);
   ASSERT_TRUE(elf100_1->valid());
   EXPECT_EQ(ARCH_X86, elf100_1->arch());
-  Elf* elf100_2 = info100_2.GetElf(memory_);
+  Elf* elf100_2 = info100_2.GetElf(memory_, ARCH_X86);
   ASSERT_TRUE(elf100_2->valid());
   EXPECT_EQ(ARCH_X86, elf100_2->arch());
   EXPECT_EQ(0U, info100_1.elf_offset);
@@ -160,10 +160,10 @@
     EXPECT_NE(elf100_1, elf100_2);
   }
 
-  Elf* elf200_1 = info200_1.GetElf(memory_);
+  Elf* elf200_1 = info200_1.GetElf(memory_, ARCH_X86_64);
   ASSERT_TRUE(elf200_1->valid());
   EXPECT_EQ(ARCH_X86_64, elf200_1->arch());
-  Elf* elf200_2 = info200_2.GetElf(memory_);
+  Elf* elf200_2 = info200_2.GetElf(memory_, ARCH_X86_64);
   ASSERT_TRUE(elf200_2->valid());
   EXPECT_EQ(ARCH_X86_64, elf200_2->arch());
   EXPECT_EQ(0U, info200_1.elf_offset);
@@ -174,10 +174,10 @@
     EXPECT_NE(elf200_1, elf200_2);
   }
 
-  Elf* elf300_1 = info300_1.GetElf(memory_);
+  Elf* elf300_1 = info300_1.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf300_1->valid());
   EXPECT_EQ(ARCH_ARM, elf300_1->arch());
-  Elf* elf300_2 = info300_2.GetElf(memory_);
+  Elf* elf300_2 = info300_2.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf300_2->valid());
   EXPECT_EQ(ARCH_ARM, elf300_2->arch());
   EXPECT_EQ(0x300U, info300_1.elf_offset);
@@ -222,10 +222,10 @@
   MapInfo info400_1(nullptr, start, end, 0x400, 0x5, tf.path);
   MapInfo info400_2(nullptr, start, end, 0x400, 0x5, tf.path);
 
-  Elf* elf300_1 = info300_1.GetElf(memory_);
+  Elf* elf300_1 = info300_1.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf300_1->valid());
   EXPECT_EQ(ARCH_ARM, elf300_1->arch());
-  Elf* elf300_2 = info300_2.GetElf(memory_);
+  Elf* elf300_2 = info300_2.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf300_2->valid());
   EXPECT_EQ(ARCH_ARM, elf300_2->arch());
   EXPECT_EQ(0x300U, info300_1.elf_offset);
@@ -236,10 +236,10 @@
     EXPECT_NE(elf300_1, elf300_2);
   }
 
-  Elf* elf400_1 = info400_1.GetElf(memory_);
+  Elf* elf400_1 = info400_1.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf400_1->valid());
   EXPECT_EQ(ARCH_ARM, elf400_1->arch());
-  Elf* elf400_2 = info400_2.GetElf(memory_);
+  Elf* elf400_2 = info400_2.GetElf(memory_, ARCH_ARM);
   ASSERT_TRUE(elf400_2->valid());
   EXPECT_EQ(ARCH_ARM, elf400_2->arch());
   EXPECT_EQ(0x400U, info400_1.elf_offset);
diff --git a/libunwindstack/tests/JitDebugTest.cpp b/libunwindstack/tests/JitDebugTest.cpp
index 4598526..b1ca111 100644
--- a/libunwindstack/tests/JitDebugTest.cpp
+++ b/libunwindstack/tests/JitDebugTest.cpp
@@ -35,12 +35,19 @@
 
 class JitDebugTest : public ::testing::Test {
  protected:
-  void SetUp() override {
-    memory_ = new MemoryFake;
-    process_memory_.reset(memory_);
+  void CreateFakeElf(MapInfo* map_info) {
+    MemoryFake* memory = new MemoryFake;
+    ElfFake* elf = new ElfFake(memory);
+    elf->FakeSetValid(true);
+    ElfInterfaceFake* interface = new ElfInterfaceFake(memory);
+    elf->FakeSetInterface(interface);
+    interface->FakeSetGlobalVariable("__jit_debug_descriptor", 0x800);
+    map_info->elf.reset(elf);
+  }
 
+  void Init(ArchEnum arch) {
     jit_debug_.reset(new JitDebug(process_memory_));
-    jit_debug_->SetArch(ARCH_ARM);
+    jit_debug_->SetArch(arch);
 
     maps_.reset(
         new BufferMaps("1000-4000 ---s 00000000 00:00 0 /fake/elf1\n"
@@ -57,33 +64,22 @@
 
     MapInfo* map_info = maps_->Get(3);
     ASSERT_TRUE(map_info != nullptr);
-    MemoryFake* memory = new MemoryFake;
-    ElfFake* elf = new ElfFake(memory);
-    elf->FakeSetValid(true);
-    ElfInterfaceFake* interface = new ElfInterfaceFake(memory);
-    elf->FakeSetInterface(interface);
-    interface->FakeSetGlobalVariable("__jit_debug_descriptor", 0x800);
-    map_info->elf.reset(elf);
+    CreateFakeElf(map_info);
 
     map_info = maps_->Get(5);
     ASSERT_TRUE(map_info != nullptr);
-    memory = new MemoryFake;
-    elf = new ElfFake(memory);
-    elf->FakeSetValid(true);
-    interface = new ElfInterfaceFake(memory);
-    elf->FakeSetInterface(interface);
-    interface->FakeSetGlobalVariable("__jit_debug_descriptor", 0x800);
-    map_info->elf.reset(elf);
+    CreateFakeElf(map_info);
 
     map_info = maps_->Get(7);
     ASSERT_TRUE(map_info != nullptr);
-    memory = new MemoryFake;
-    elf = new ElfFake(memory);
-    elf->FakeSetValid(true);
-    interface = new ElfInterfaceFake(memory);
-    elf->FakeSetInterface(interface);
-    interface->FakeSetGlobalVariable("__jit_debug_descriptor", 0x800);
-    map_info->elf.reset(elf);
+    CreateFakeElf(map_info);
+  }
+
+  void SetUp() override {
+    memory_ = new MemoryFake;
+    process_memory_.reset(memory_);
+
+    Init(ARCH_ARM);
   }
 
   template <typename EhdrType, typename ShdrType>
@@ -326,6 +322,8 @@
 }
 
 TEST_F(JitDebugTest, get_elf_x86) {
+  Init(ARCH_X86);
+
   CreateElf<Elf32_Ehdr, Elf32_Shdr>(0x4000, ELFCLASS32, EM_ARM, 0x1500, 0x200);
 
   WriteDescriptor32(0xf800, 0x200000);
@@ -343,12 +341,13 @@
 }
 
 TEST_F(JitDebugTest, get_elf_64) {
+  Init(ARCH_ARM64);
+
   CreateElf<Elf64_Ehdr, Elf64_Shdr>(0x4000, ELFCLASS64, EM_AARCH64, 0x1500, 0x200);
 
   WriteDescriptor64(0xf800, 0x200000);
   WriteEntry64(0x200000, 0, 0, 0x4000, 0x1000);
 
-  jit_debug_->SetArch(ARCH_ARM64);
   Elf* elf = jit_debug_->GetElf(maps_.get(), 0x1500);
   ASSERT_TRUE(elf != nullptr);
 
diff --git a/libunwindstack/tests/MapInfoGetElfTest.cpp b/libunwindstack/tests/MapInfoGetElfTest.cpp
index c6c1c34..4d74696 100644
--- a/libunwindstack/tests/MapInfoGetElfTest.cpp
+++ b/libunwindstack/tests/MapInfoGetElfTest.cpp
@@ -72,7 +72,7 @@
   MapInfo info(nullptr, 0x1000, 0x2000, 0, PROT_READ, "");
 
   // The map is empty, but this should still create an invalid elf object.
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_FALSE(elf->valid());
 }
@@ -84,7 +84,7 @@
   TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM);
   memory_->SetMemory(0x3000, &ehdr, sizeof(ehdr));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   EXPECT_EQ(static_cast<uint32_t>(EM_ARM), elf->machine_type());
@@ -98,13 +98,25 @@
   TestInitEhdr<Elf64_Ehdr>(&ehdr, ELFCLASS64, EM_AARCH64);
   memory_->SetMemory(0x8000, &ehdr, sizeof(ehdr));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM64);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   EXPECT_EQ(static_cast<uint32_t>(EM_AARCH64), elf->machine_type());
   EXPECT_EQ(ELFCLASS64, elf->class_type());
 }
 
+TEST_F(MapInfoGetElfTest, invalid_arch_mismatch) {
+  MapInfo info(nullptr, 0x3000, 0x4000, 0, PROT_READ, "");
+
+  Elf32_Ehdr ehdr;
+  TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM);
+  memory_->SetMemory(0x3000, &ehdr, sizeof(ehdr));
+
+  Elf* elf = info.GetElf(process_memory_, ARCH_X86);
+  ASSERT_TRUE(elf != nullptr);
+  ASSERT_FALSE(elf->valid());
+}
+
 TEST_F(MapInfoGetElfTest, gnu_debugdata_init32) {
   MapInfo info(nullptr, 0x2000, 0x3000, 0, PROT_READ, "");
 
@@ -113,7 +125,7 @@
                                                  memory_->SetMemory(0x2000 + offset, ptr, size);
                                                });
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   EXPECT_EQ(static_cast<uint32_t>(EM_ARM), elf->machine_type());
@@ -129,7 +141,7 @@
                                                  memory_->SetMemory(0x5000 + offset, ptr, size);
                                                });
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM64);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   EXPECT_EQ(static_cast<uint32_t>(EM_AARCH64), elf->machine_type());
@@ -144,20 +156,20 @@
   TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM);
   ASSERT_TRUE(android::base::WriteFully(elf_.fd, &ehdr, sizeof(ehdr)));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_FALSE(elf->valid());
 
   info.elf.reset();
   info.end = 0xfff;
-  elf = info.GetElf(process_memory_);
+  elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_FALSE(elf->valid());
 
   // Make sure this test is valid.
   info.elf.reset();
   info.end = 0x2000;
-  elf = info.GetElf(process_memory_);
+  elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
 }
@@ -174,7 +186,7 @@
   memcpy(buffer.data(), &ehdr, sizeof(ehdr));
   ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   ASSERT_TRUE(elf->memory() != nullptr);
@@ -203,7 +215,7 @@
   memcpy(&buffer[info.offset], &ehdr, sizeof(ehdr));
   ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   ASSERT_TRUE(elf->memory() != nullptr);
@@ -236,7 +248,7 @@
   memcpy(&buffer[info.offset], &ehdr, sizeof(ehdr));
   ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   ASSERT_TRUE(elf->memory() != nullptr);
@@ -264,7 +276,7 @@
   memcpy(&buffer[info.offset], &ehdr, sizeof(ehdr));
   ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM64);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_TRUE(elf->valid());
   ASSERT_TRUE(elf->memory() != nullptr);
@@ -290,13 +302,13 @@
   ehdr.e_shnum = 0;
   memory_->SetMemory(0x9000, &ehdr, sizeof(ehdr));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_ARM64);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_FALSE(elf->valid());
 
   info.elf.reset();
   info.flags = PROT_READ;
-  elf = info.GetElf(process_memory_);
+  elf = info.GetElf(process_memory_, ARCH_ARM64);
   ASSERT_TRUE(elf->valid());
 }
 
@@ -313,20 +325,20 @@
   ehdr.e_shnum = 0;
   memory_->SetMemory(0x7000, &ehdr, sizeof(ehdr));
 
-  Elf* elf = info.GetElf(process_memory_);
+  Elf* elf = info.GetElf(process_memory_, ARCH_X86_64);
   ASSERT_TRUE(elf != nullptr);
   ASSERT_FALSE(elf->valid());
 
   // Set the name to nothing to verify that it still fails.
   info.elf.reset();
   info.name = "";
-  elf = info.GetElf(process_memory_);
+  elf = info.GetElf(process_memory_, ARCH_X86_64);
   ASSERT_FALSE(elf->valid());
 
   // Change the flags and verify the elf is valid now.
   info.elf.reset();
   info.flags = PROT_READ;
-  elf = info.GetElf(process_memory_);
+  elf = info.GetElf(process_memory_, ARCH_X86_64);
   ASSERT_TRUE(elf->valid());
 }
 
@@ -352,7 +364,7 @@
     std::thread* thread = new std::thread([i, this, &wait, &info, &elf_in_threads]() {
       while (wait)
         ;
-      Elf* elf = info.GetElf(process_memory_);
+      Elf* elf = info.GetElf(process_memory_, ARCH_X86_64);
       elf_in_threads[i] = elf;
     });
     threads.push_back(thread);