diff --git a/clang/docs/UndefinedBehaviorSanitizer.rst b/clang/docs/UndefinedBehaviorSanitizer.rst
--- a/clang/docs/UndefinedBehaviorSanitizer.rst
+++ b/clang/docs/UndefinedBehaviorSanitizer.rst
@@ -100,8 +100,8 @@
      by Clang (and by ISO/IEC/IEEE 60559 / IEEE 754) as producing either an
      infinity or NaN value, so is not included in ``-fsanitize=undefined``.
   -  ``-fsanitize=function``: Indirect call of a function through a
-     function pointer of the wrong type (Darwin/Linux, C++ and x86/x86_64
-     only).
+     function pointer of the wrong type (Darwin/Linux, C++ and
+     AArch64/x86-32/x86-64 only).
   -  ``-fsanitize=implicit-unsigned-integer-truncation``,
      ``-fsanitize=implicit-signed-integer-truncation``: Implicit conversion from
      integer of larger bit width to smaller bit width, if that results in data
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -5644,6 +5644,12 @@
     }
     return TargetCodeGenInfo::isScalarizableAsmOperand(CGF, Ty);
   }
+
+  llvm::Constant *
+  getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const override {
+    // b .+8
+    return llvm::ConstantInt::get(CGM.Int32Ty, 0x14000002);
+  }
 };
 
 class WindowsAArch64TargetCodeGenInfo : public AArch64TargetCodeGenInfo {
diff --git a/clang/lib/Driver/ToolChains/FreeBSD.cpp b/clang/lib/Driver/ToolChains/FreeBSD.cpp
--- a/clang/lib/Driver/ToolChains/FreeBSD.cpp
+++ b/clang/lib/Driver/ToolChains/FreeBSD.cpp
@@ -483,9 +483,8 @@
     Res |= SanitizerKind::Leak;
     Res |= SanitizerKind::Thread;
   }
-  if (IsX86 || IsX86_64) {
+  if (IsAArch64 || IsX86 || IsX86_64)
     Res |= SanitizerKind::Function;
-  }
   if (IsAArch64 || IsX86 || IsX86_64) {
     Res |= SanitizerKind::SafeStack;
     Res |= SanitizerKind::Fuzzer;
diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp
--- a/clang/lib/Driver/ToolChains/Linux.cpp
+++ b/clang/lib/Driver/ToolChains/Linux.cpp
@@ -771,7 +771,7 @@
     Res |= SanitizerKind::Thread;
   if (IsX86_64)
     Res |= SanitizerKind::KernelMemory;
-  if (IsX86 || IsX86_64)
+  if (IsAArch64 || IsX86 || IsX86_64)
     Res |= SanitizerKind::Function;
   if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch ||
       IsPowerPC64 || IsHexagon || IsLoongArch64 || IsRISCV64)
diff --git a/clang/test/CodeGen/ubsan-function.cpp b/clang/test/CodeGen/ubsan-function.cpp
--- a/clang/test/CodeGen/ubsan-function.cpp
+++ b/clang/test/CodeGen/ubsan-function.cpp
@@ -1,4 +1,6 @@
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -o - %s -fsanitize=function -fno-sanitize-recover=all | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -o - %s -fsanitize=function -fno-sanitize-recover=all | FileCheck %s --check-prefixes=CHECK,X86
+// RUN: %clang_cc1 -triple aarch64-linux-gnu -emit-llvm -o - %s -fsanitize=function -fno-sanitize-recover=all | FileCheck %s --check-prefixes=CHECK,AARCH64
+// RUN: %clang_cc1 -triple aarch64_be-linux-gnu -emit-llvm -o - %s -fsanitize=function -fno-sanitize-recover=all | FileCheck %s --check-prefixes=CHECK,AARCH64
 
 // CHECK: @[[PROXY:.*]] = private unnamed_addr constant ptr @_ZTIFvvE
 // CHECK: define{{.*}} void @_Z3funv() #0 !func_sanitize ![[FUNCSAN:.*]] {
@@ -7,7 +9,8 @@
 // CHECK-LABEL: define{{.*}} void @_Z6callerPFvvE(ptr noundef %f)
 // CHECK: getelementptr <{ i32, i32 }>, ptr {{.*}}, i32 -1, i32 0, !nosanitize
 // CHECK: load i32, ptr {{.*}}, align {{.*}}, !nosanitize
-// CHECK: icmp eq i32 {{.*}}, 846595819, !nosanitize
+// X86-NEXT:     icmp eq i32 {{.*}}, 846595819, !nosanitize
+// AARCH64-NEXT: icmp eq i32 {{.*}}, 335544322, !nosanitize
 // CHECK: br i1 {{.*}}, label %[[LABEL1:.*]], label %[[LABEL4:.*]], !nosanitize
 // CHECK: [[LABEL1]]:
 // CHECK: getelementptr <{ i32, i32 }>, ptr {{.*}}, i32 -1, i32 1, !nosanitize
@@ -22,4 +25,7 @@
 // CHECK: br label %[[LABEL4]], !nosanitize
 void caller(void (*f)()) { f(); }
 
-// CHECK: ![[FUNCSAN]] = !{i32 846595819, ptr @[[PROXY]]}
+// X86:     ![[FUNCSAN]] = !{i32 846595819, ptr @[[PROXY]]}
+
+/// .word 0x14000002  # b .+8
+// AARCH64: ![[FUNCSAN]] = !{i32 335544322, ptr @[[PROXY]]}
diff --git a/clang/test/Driver/fsanitize.c b/clang/test/Driver/fsanitize.c
--- a/clang/test/Driver/fsanitize.c
+++ b/clang/test/Driver/fsanitize.c
@@ -525,9 +525,10 @@
 // RUN: %clang --target=x86_64-linux-gnu -fsanitize=thread -fsanitize-thread-atomics -fno-sanitize-thread-atomics %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-ATOMICS-BOTH-OFF
 // CHECK-TSAN-ATOMICS-BOTH-OFF: -cc1{{.*}}tsan-instrument-atomics=0
 
-// RUN: %clang --target=x86_64-apple-darwin10 -fsanitize=function %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-FSAN-DARWIN
-// RUN: %clang --target=i386-apple-darwin10 -fsanitize=function %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-FSAN-DARWIN
-// CHECK-FSAN-DARWIN: -cc1{{.*}}"-fsanitize=function" "-fsanitize-recover=function"
+// RUN: %clang --target=x86_64-apple-darwin10 -fsanitize=function %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-FUNCTION
+// RUN: %clang --target=i386-apple-darwin10 -fsanitize=function %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-FUNCTION
+// RUN: %clang --target=aarch64-unknown-linux-gnu -fsanitize=function %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-FUNCTION
+// CHECK-FUNCTION: -cc1{{.*}}"-fsanitize=function" "-fsanitize-recover=function"
 
 // RUN: %clang --target=x86_64-apple-darwin10 -mmacosx-version-min=10.8 -fsanitize=vptr %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-VPTR-DARWIN-OLD
 // CHECK-VPTR-DARWIN-OLD: unsupported option '-fsanitize=vptr' for target 'x86_64-apple-darwin10'
diff --git a/compiler-rt/test/ubsan/TestCases/TypeCheck/Function/lit.local.cfg.py b/compiler-rt/test/ubsan/TestCases/TypeCheck/Function/lit.local.cfg.py
--- a/compiler-rt/test/ubsan/TestCases/TypeCheck/Function/lit.local.cfg.py
+++ b/compiler-rt/test/ubsan/TestCases/TypeCheck/Function/lit.local.cfg.py
@@ -1,3 +1,3 @@
-# The function type checker is only supported on x86 and x86_64 for now.
-if config.target_arch not in ['x86', 'x86_64']:
+# The function type checker is only supported on aarch64 and x86 for now.
+if config.target_arch not in ['aarch64', 'x86', 'x86_64']:
   config.unsupported = True
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -972,7 +972,7 @@
 
   // Emit the function prologue data for the indirect call sanitizer.
   if (const MDNode *MD = F.getMetadata(LLVMContext::MD_func_sanitize)) {
-    assert(TM.getTargetTriple().isX86());
+    assert(TM.getTargetTriple().isAArch64() || TM.getTargetTriple().isX86());
     assert(MD->getNumOperands() == 2);
 
     auto *PrologueSig = mdconst::extract<Constant>(MD->getOperand(0));
diff --git a/llvm/test/CodeGen/AArch64/func-sanitizer.ll b/llvm/test/CodeGen/AArch64/func-sanitizer.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/func-sanitizer.ll
@@ -0,0 +1,22 @@
+; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+; CHECK-LABEL: .type _Z3funv,@function
+; CHECK-NEXT:    .word   335544322  // 0x14000002
+; CHECK-NEXT:    .word   .L__llvm_rtti_proxy-_Z3funv
+; CHECK-NEXT:  _Z3funv:
+; CHECK-NEXT:  // %bb.0:
+; CHECK-NEXT:    ret
+
+; CHECK:       .section .rodata,"a",@progbits
+; CHECK-LABEL: .L__llvm_rtti_proxy:
+; CHECK-NEXT:    .xword  _ZTIFvvE
+; CHECK-NEXT:    .size   .L__llvm_rtti_proxy, 8
+
+@_ZTIFvvE = linkonce_odr constant i32 1
+@__llvm_rtti_proxy = private unnamed_addr constant ptr @_ZTIFvvE
+
+define dso_local void @_Z3funv() nounwind !func_sanitize !0 {
+  ret void
+}
+
+!0 = !{i32 335544322, ptr @__llvm_rtti_proxy}
diff --git a/llvm/test/CodeGen/AArch64/patchable-function-entry-bti.ll b/llvm/test/CodeGen/AArch64/patchable-function-entry-bti.ll
--- a/llvm/test/CodeGen/AArch64/patchable-function-entry-bti.ll
+++ b/llvm/test/CodeGen/AArch64/patchable-function-entry-bti.ll
@@ -1,5 +1,8 @@
 ; RUN: llc -mtriple=aarch64 %s -o - | FileCheck %s
 
+@_ZTIFvvE = linkonce_odr constant i32 2
+@__llvm_rtti_proxy = private unnamed_addr constant ptr @_ZTIFvvE
+
 define void @f0() "patchable-function-entry"="0" "branch-target-enforcement"="true" {
 ; CHECK-LABEL: f0:
 ; CHECK-NEXT: .Lfunc_begin0:
@@ -85,3 +88,22 @@
   call void asm sideeffect "", ""()
   ret void
 }
+
+;; Test the interaction with -fsanitize=function.
+; CHECK:      .type sanitize_function,@function
+; CHECK-NEXT: .Ltmp{{.*}}:
+; CHECK-NEXT:   nop
+; CHECK-NEXT:   .word   335544322  // 0x14000002
+; CHECK-NEXT:   .word   .L__llvm_rtti_proxy-sanitize_function
+; CHECK-NEXT: sanitize_function:
+; CHECK-NEXT: .Lfunc_begin{{.*}}:
+; CHECK-NEXT:   .cfi_startproc
+; CHECK-NEXT:   // %bb.0:
+; CHECK-NEXT:   hint #34
+; CHECK-NEXT:   nop
+; CHECK-NEXT:   ret
+define void @sanitize_function(ptr noundef %x) "patchable-function-prefix"="1" "patchable-function-entry"="1" "branch-target-enforcement"="true" !func_sanitize !0 {
+  ret void
+}
+
+!0 = !{i32 335544322, ptr @__llvm_rtti_proxy}