diff --git a/lib/compiler-rt/builtins/assembly.h b/lib/compiler-rt/builtins/assembly.h
new file mode 100644
index 0000000..3f5e59b
--- /dev/null
+++ b/lib/compiler-rt/builtins/assembly.h
@@ -0,0 +1,204 @@
+/* ===-- assembly.h - compiler-rt assembler support macros -----------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file defines macros for use in compiler-rt assembler source.
+ * This file is not part of the interface of this library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#ifndef COMPILERRT_ASSEMBLY_H
+#define COMPILERRT_ASSEMBLY_H
+
+#if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
+#define SEPARATOR @
+#else
+#define SEPARATOR ;
+#endif
+
+#if defined(__APPLE__)
+#define HIDDEN(name) .private_extern name
+#define LOCAL_LABEL(name) L_##name
+// tell linker it can break up file at label boundaries
+#define FILE_LEVEL_DIRECTIVE .subsections_via_symbols
+#define SYMBOL_IS_FUNC(name)
+#define CONST_SECTION .const
+
+#define NO_EXEC_STACK_DIRECTIVE
+
+#elif defined(__ELF__)
+
+#define HIDDEN(name) .hidden name
+#define LOCAL_LABEL(name) .L_##name
+#define FILE_LEVEL_DIRECTIVE
+#if defined(__arm__)
+#define SYMBOL_IS_FUNC(name) .type name,%function
+#else
+#define SYMBOL_IS_FUNC(name) .type name,@function
+#endif
+#define CONST_SECTION .section .rodata
+
+#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
+    defined(__linux__)
+#define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
+#else
+#define NO_EXEC_STACK_DIRECTIVE
+#endif
+
+#else // !__APPLE__ && !__ELF__
+
+#define HIDDEN(name)
+#define LOCAL_LABEL(name) .L ## name
+#define FILE_LEVEL_DIRECTIVE
+#define SYMBOL_IS_FUNC(name)                                                   \
+  .def name SEPARATOR                                                          \
+    .scl 2 SEPARATOR                                                           \
+    .type 32 SEPARATOR                                                         \
+  .endef
+#define CONST_SECTION .section .rdata,"rd"
+
+#define NO_EXEC_STACK_DIRECTIVE
+
+#endif
+
+#if defined(__arm__)
+
+/*
+ * Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
+ * - for '-mthumb -march=armv6' compiler defines '__thumb__'
+ * - for '-mthumb -march=armv7' compiler defines '__thumb__' and '__thumb2__'
+ */
+#if defined(__thumb2__) || defined(__thumb__)
+#define DEFINE_CODE_STATE .thumb SEPARATOR
+#define DECLARE_FUNC_ENCODING    .thumb_func SEPARATOR
+#if defined(__thumb2__)
+#define USE_THUMB_2
+#define IT(cond)  it cond
+#define ITT(cond) itt cond
+#define ITE(cond) ite cond
+#else
+#define USE_THUMB_1
+#define IT(cond)
+#define ITT(cond)
+#define ITE(cond)
+#endif // defined(__thumb__2)
+#else // !defined(__thumb2__) && !defined(__thumb__)
+#define DEFINE_CODE_STATE .arm SEPARATOR
+#define DECLARE_FUNC_ENCODING
+#define IT(cond)
+#define ITT(cond)
+#define ITE(cond)
+#endif
+
+#if defined(USE_THUMB_1) && defined(USE_THUMB_2)
+#error "USE_THUMB_1 and USE_THUMB_2 can't be defined together."
+#endif
+
+#if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
+#define ARM_HAS_BX
+#endif
+#if !defined(__ARM_FEATURE_CLZ) && !defined(USE_THUMB_1) &&  \
+    (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
+#define __ARM_FEATURE_CLZ
+#endif
+
+#ifdef ARM_HAS_BX
+#define JMP(r) bx r
+#define JMPc(r, c) bx##c r
+#else
+#define JMP(r) mov pc, r
+#define JMPc(r, c) mov##c pc, r
+#endif
+
+// pop {pc} can't switch Thumb mode on ARMv4T
+#if __ARM_ARCH >= 5
+#define POP_PC() pop {pc}
+#else
+#define POP_PC()                                                               \
+  pop {ip};                                                                    \
+  JMP(ip)
+#endif
+
+#if defined(USE_THUMB_2)
+#define WIDE(op) op.w
+#else
+#define WIDE(op) op
+#endif
+#else // !defined(__arm)
+#define DECLARE_FUNC_ENCODING
+#define DEFINE_CODE_STATE
+#endif
+
+#define GLUE2(a, b) a##b
+#define GLUE(a, b) GLUE2(a, b)
+#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
+
+#ifdef VISIBILITY_HIDDEN
+#define DECLARE_SYMBOL_VISIBILITY(name)                                        \
+  HIDDEN(SYMBOL_NAME(name)) SEPARATOR
+#else
+#define DECLARE_SYMBOL_VISIBILITY(name)
+#endif
+
+#define DEFINE_COMPILERRT_FUNCTION(name)                                       \
+  DEFINE_CODE_STATE                                                            \
+  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
+  .globl SYMBOL_NAME(name) SEPARATOR                                           \
+  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
+  DECLARE_SYMBOL_VISIBILITY(name)                                              \
+  DECLARE_FUNC_ENCODING                                                        \
+  SYMBOL_NAME(name):
+
+#define DEFINE_COMPILERRT_THUMB_FUNCTION(name)                                 \
+  DEFINE_CODE_STATE                                                            \
+  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
+  .globl SYMBOL_NAME(name) SEPARATOR                                           \
+  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
+  DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
+  .thumb_func SEPARATOR                                                        \
+  SYMBOL_NAME(name):
+
+#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
+  DEFINE_CODE_STATE                                                            \
+  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
+  .globl SYMBOL_NAME(name) SEPARATOR                                           \
+  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
+  HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
+  DECLARE_FUNC_ENCODING                                                        \
+  SYMBOL_NAME(name):
+
+#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
+  DEFINE_CODE_STATE                                                            \
+  .globl name SEPARATOR                                                        \
+  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
+  HIDDEN(name) SEPARATOR                                                       \
+  DECLARE_FUNC_ENCODING                                                        \
+  name:
+
+#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
+  .globl SYMBOL_NAME(name) SEPARATOR                                           \
+  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
+  DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR                       \
+  .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
+
+#if defined(__ARM_EABI__)
+#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
+  DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
+#else
+#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
+#endif
+
+#ifdef __ELF__
+#define END_COMPILERRT_FUNCTION(name)                                          \
+  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
+#else
+#define END_COMPILERRT_FUNCTION(name)
+#endif
+
+#endif /* COMPILERRT_ASSEMBLY_H */