Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -2048,7 +2048,7 @@
   if (Subtarget.getTargetTriple().isOSContiki())
     return getDefaultSafeStackPointerLocation(IRB, false);
 
-  if (!Subtarget.isTargetAndroid())
+  if (!(Subtarget.isTargetAndroid() || Subtarget.getTargetTriple().isMusl()))
     return TargetLowering::getSafeStackPointerLocation(IRB);
 
   // Android provides a fixed TLS slot for the SafeStack pointer. See the
Index: test/Transforms/SafeStack/X86/addr-taken.ll
===================================================================
--- test/Transforms/SafeStack/X86/addr-taken.ll
+++ test/Transforms/SafeStack/X86/addr-taken.ll
@@ -1,5 +1,7 @@
 ; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
 ; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
+; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-musl < %s -o - | FileCheck --check-prefix TCB32 %s
+; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-musl < %s -o - | FileCheck --check-prefix TCB64 %s
 
 @.str = private unnamed_addr constant [4 x i8] c"%s\0A\00", align 1
 
@@ -9,6 +11,12 @@
 define void @foo() nounwind uwtable safestack {
 entry:
   ; CHECK: __safestack_unsafe_stack_ptr
+  ; TCB32: %unsafe_stack_ptr = load i8*, i8* addrspace(256)* inttoptr (i32 36 to i8* addrspace(256)*)
+  ; TCB32-NEXT: %unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -16
+  ; TCB32-NEXT: store i8* %unsafe_stack_static_top, i8* addrspace(256)* inttoptr (i32 36 to i8* addrspace(256)*)
+  ; TCB64: %unsafe_stack_ptr = load i8*, i8* addrspace(257)* inttoptr (i32 72 to i8* addrspace(257)*)
+  ; TCB64-NEXT: %unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -16
+  ; TCB64-NEXT: store i8* %unsafe_stack_static_top, i8* addrspace(257)* inttoptr (i32 72 to i8* addrspace(257)*)
   %retval = alloca i32, align 4
   %a = alloca i32, align 4
   %j = alloca i32*, align 8
@@ -17,6 +25,8 @@
   %add = add nsw i32 %0, 1
   store i32 %add, i32* %a, align 4
   store i32* %a, i32** %j, align 8
+  ; TCB32: store i8* %unsafe_stack_ptr, i8* addrspace(256)* inttoptr (i32 36 to i8* addrspace(256)*)
+  ; TCB64: store i8* %unsafe_stack_ptr, i8* addrspace(257)* inttoptr (i32 72 to i8* addrspace(257)*)
   ret void
 }