[libunwind] Export the unw_* symbols as weak symbols

libunwind defines the _Unwind_* ABI used by libc++abi. This ABI is a
stable quasi-standard common between multiple implementations such as
LLVM and GNU. The _U* symbol name space is also safely within the symbol
name space that standard C & C++ reserve for the implementation.

Futhermore, libunwind also defines several unw_* symbols, and references
these from the _Unwind_* entry points so the standard/reserved part of
the ABI is dependent on the unw_* part of the ABI. This is not OK for a
C or C++ implementation. The unw_* symbols are reserved for C and extern
"C" used by application code.

This change renames each unw_* function to __unw* and adds a weak alias
unw_* to keep the public <libunwind.h> ABI unchanged for backwards
compatibility. Every reference to unw_* in the implementation has been
changed to use __unw* so that if other unw_* definitions are in force
because nothing uses <libunwind.h> in a particular program, no _Unwind*
code path depends on any unw_* symbol. Furthemore, __unw_* symbols are
hidden, which saves PLT overhead in the shared library case.

In the future, we should cconsider untangling the unw_* API/ABI from the
_Unwind_* API/ABI. The internal API backing the _Unwind_* ABI
implementation should not rely on any nonstandard symbols not in the
implementation-reserved name space. This would then allow separating the
_Unwind_* API/ABI from unw_* entirely, but that's a more substantial
change that's going to require more significant refactoring.

Differential Revision: https://reviews.llvm.org/D59921

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@357640 91177308-0d34-0410-b5e6-96231b3b80d8

12 files changed, 360 insertions, 275 deletions

diff --git a/src/Registers.hpp b/src/Registers.hpp
index e88ba51..a36c6cf 100644
--- a/src/Registers.hpp
+++ b/src/Registers.hpp
@@ -2154,7 +2154,7 @@ inline Registers_arm::Registers_arm(const void *registers)
     _saved_vfp_d16_d31(false) {
   static_assert((check_fit<Registers_arm, unw_context_t>::does_fit),
                 "arm registers do not fit into unw_context_t");
-  // See unw_getcontext() note about data.
+  // See __unw_getcontext() note about data.
   memcpy(&_registers, registers, sizeof(_registers));
   memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad));
   memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31));
@@ -2433,7 +2433,7 @@ inline const char *Registers_arm::getRegisterName(int regNum) {
 
 inline bool Registers_arm::validFloatRegister(int regNum) const {
   // NOTE: Consider the intel MMX registers floating points so the
-  // unw_get_fpreg can be used to transmit the 64-bit data back.
+  // __unw_get_fpreg can be used to transmit the 64-bit data back.
   return ((regNum >= UNW_ARM_D0) && (regNum <= UNW_ARM_D31))
 #if defined(__ARM_WMMX)
       || ((regNum >= UNW_ARM_WR0) && (regNum <= UNW_ARM_WR15))
diff --git a/src/Unwind-EHABI.cpp b/src/Unwind-EHABI.cpp
index c64ca12..f455823 100644
--- a/src/Unwind-EHABI.cpp
+++ b/src/Unwind-EHABI.cpp
@@ -179,7 +179,7 @@ static _Unwind_Reason_Code unwindOneFrame(_Unwind_State state,
   if (result != _URC_CONTINUE_UNWIND)
     return result;
 
-  if (unw_step(reinterpret_cast<unw_cursor_t*>(context)) != UNW_STEP_SUCCESS)
+  if (__unw_step(reinterpret_cast<unw_cursor_t *>(context)) != UNW_STEP_SUCCESS)
     return _URC_FAILURE;
   return _URC_CONTINUE_UNWIND;
 }
@@ -440,17 +440,18 @@ unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
   // In this implementation, the phases don't share the VRS backing store.
   // Instead, they are passed the original |uc| and they create a new VRS
   // from scratch thus achieving the same effect.
-  unw_init_local(cursor, uc);
+  __unw_init_local(cursor, uc);
 
   // Walk each frame looking for a place to stop.
   for (bool handlerNotFound = true; handlerNotFound;) {
 
     // See if frame has code to run (has personality routine).
     unw_proc_info_t frameInfo;
-    if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_get_proc_info "
-                                 "failed => _URC_FATAL_PHASE1_ERROR",
-                                 static_cast<void *>(exception_object));
+    if (__unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase1(ex_ojb=%p): __unw_get_proc_info "
+          "failed => _URC_FATAL_PHASE1_ERROR",
+          static_cast<void *>(exception_object));
       return _URC_FATAL_PHASE1_ERROR;
     }
 
@@ -459,12 +460,12 @@ unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
-                             &offset) != UNW_ESUCCESS) ||
+      if ((__unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
+                               &offset) != UNW_ESUCCESS) ||
           (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       unw_word_t pc;
-      unw_get_reg(cursor, UNW_REG_IP, &pc);
+      __unw_get_reg(cursor, UNW_REG_IP, &pc);
       _LIBUNWIND_TRACE_UNWINDING(
           "unwind_phase1(ex_ojb=%p): pc=0x%" PRIxPTR ", start_ip=0x%" PRIxPTR ", func=%s, "
           "lsda=0x%" PRIxPTR ", personality=0x%" PRIxPTR,
@@ -534,7 +535,7 @@ static _Unwind_Reason_Code unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor
                                          _Unwind_Exception *exception_object,
                                          bool resume) {
   // See comment at the start of unwind_phase1 regarding VRS integrity.
-  unw_init_local(cursor, uc);
+  __unw_init_local(cursor, uc);
 
   _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p)",
                              static_cast<void *>(exception_object));
@@ -556,19 +557,20 @@ static _Unwind_Reason_Code unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor
       // for. After this, continue unwinding as if normal.
       //
       // See #7.4.6 for details.
-      unw_set_reg(cursor, UNW_REG_IP,
-                  exception_object->unwinder_cache.reserved2);
+      __unw_set_reg(cursor, UNW_REG_IP,
+                    exception_object->unwinder_cache.reserved2);
       resume = false;
     }
 
     // Get info about this frame.
     unw_word_t sp;
     unw_proc_info_t frameInfo;
-    unw_get_reg(cursor, UNW_REG_SP, &sp);
-    if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_get_proc_info "
-                                 "failed => _URC_FATAL_PHASE2_ERROR",
-                                 static_cast<void *>(exception_object));
+    __unw_get_reg(cursor, UNW_REG_SP, &sp);
+    if (__unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase2(ex_ojb=%p): __unw_get_proc_info "
+          "failed => _URC_FATAL_PHASE2_ERROR",
+          static_cast<void *>(exception_object));
       return _URC_FATAL_PHASE2_ERROR;
     }
 
@@ -577,8 +579,8 @@ static _Unwind_Reason_Code unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
-                             &offset) != UNW_ESUCCESS) ||
+      if ((__unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
+                               &offset) != UNW_ESUCCESS) ||
           (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING(
@@ -622,8 +624,8 @@ static _Unwind_Reason_Code unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor
         // We may get control back if landing pad calls _Unwind_Resume().
         if (_LIBUNWIND_TRACING_UNWINDING) {
           unw_word_t pc;
-          unw_get_reg(cursor, UNW_REG_IP, &pc);
-          unw_get_reg(cursor, UNW_REG_SP, &sp);
+          __unw_get_reg(cursor, UNW_REG_IP, &pc);
+          __unw_get_reg(cursor, UNW_REG_SP, &sp);
           _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): re-entering "
                                      "user code with ip=0x%" PRIxPTR ", sp=0x%" PRIxPTR,
                                      static_cast<void *>(exception_object),
@@ -634,11 +636,11 @@ static _Unwind_Reason_Code unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor
           // EHABI #7.4.1 says we need to preserve pc for when _Unwind_Resume
           // is called back, to find this same frame.
           unw_word_t pc;
-          unw_get_reg(cursor, UNW_REG_IP, &pc);
+          __unw_get_reg(cursor, UNW_REG_IP, &pc);
           exception_object->unwinder_cache.reserved2 = (uint32_t)pc;
         }
-        unw_resume(cursor);
-        // unw_resume() only returns if there was an error.
+        __unw_resume(cursor);
+        // __unw_resume() only returns if there was an error.
         return _URC_FATAL_PHASE2_ERROR;
 
       // # EHABI #7.4.3
@@ -667,7 +669,7 @@ _Unwind_RaiseException(_Unwind_Exception *exception_object) {
                        static_cast<void *>(exception_object));
   unw_context_t uc;
   unw_cursor_t cursor;
-  unw_getcontext(&uc);
+  __unw_getcontext(&uc);
 
   // This field for is for compatibility with GCC to say this isn't a forced
   // unwind. EHABI #7.2
@@ -705,7 +707,7 @@ _Unwind_Resume(_Unwind_Exception *exception_object) {
                        static_cast<void *>(exception_object));
   unw_context_t uc;
   unw_cursor_t cursor;
-  unw_getcontext(&uc);
+  __unw_getcontext(&uc);
 
   // _Unwind_RaiseException on EHABI will always set the reserved1 field to 0,
   // which is in the same position as private_1 below.
@@ -722,7 +724,7 @@ _Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_proc_info_t frameInfo;
   uintptr_t result = 0;
-  if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
+  if (__unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
     result = (uintptr_t)frameInfo.lsda;
   _LIBUNWIND_TRACE_API(
       "_Unwind_GetLanguageSpecificData(context=%p) => 0x%llx",
@@ -762,8 +764,8 @@ _Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
     case _UVRSC_CORE:
       if (representation != _UVRSD_UINT32 || regno > 15)
         return _UVRSR_FAILED;
-      return unw_set_reg(cursor, (unw_regnum_t)(UNW_ARM_R0 + regno),
-                         *(unw_word_t *)valuep) == UNW_ESUCCESS
+      return __unw_set_reg(cursor, (unw_regnum_t)(UNW_ARM_R0 + regno),
+                           *(unw_word_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
     case _UVRSC_VFP:
@@ -773,28 +775,28 @@ _Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
         // Can only touch d0-15 with FSTMFDX.
         if (regno > 15)
           return _UVRSR_FAILED;
-        unw_save_vfp_as_X(cursor);
+        __unw_save_vfp_as_X(cursor);
       } else {
         if (regno > 31)
           return _UVRSR_FAILED;
       }
-      return unw_set_fpreg(cursor, (unw_regnum_t)(UNW_ARM_D0 + regno),
-                           *(unw_fpreg_t *)valuep) == UNW_ESUCCESS
+      return __unw_set_fpreg(cursor, (unw_regnum_t)(UNW_ARM_D0 + regno),
+                             *(unw_fpreg_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
 #if defined(__ARM_WMMX)
     case _UVRSC_WMMXC:
       if (representation != _UVRSD_UINT32 || regno > 3)
         return _UVRSR_FAILED;
-      return unw_set_reg(cursor, (unw_regnum_t)(UNW_ARM_WC0 + regno),
-                         *(unw_word_t *)valuep) == UNW_ESUCCESS
+      return __unw_set_reg(cursor, (unw_regnum_t)(UNW_ARM_WC0 + regno),
+                           *(unw_word_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
     case _UVRSC_WMMXD:
       if (representation != _UVRSD_DOUBLE || regno > 31)
         return _UVRSR_FAILED;
-      return unw_set_fpreg(cursor, (unw_regnum_t)(UNW_ARM_WR0 + regno),
-                           *(unw_fpreg_t *)valuep) == UNW_ESUCCESS
+      return __unw_set_fpreg(cursor, (unw_regnum_t)(UNW_ARM_WR0 + regno),
+                             *(unw_fpreg_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
 #else
@@ -816,8 +818,8 @@ _Unwind_VRS_Get_Internal(_Unwind_Context *context,
     case _UVRSC_CORE:
       if (representation != _UVRSD_UINT32 || regno > 15)
         return _UVRSR_FAILED;
-      return unw_get_reg(cursor, (unw_regnum_t)(UNW_ARM_R0 + regno),
-                         (unw_word_t *)valuep) == UNW_ESUCCESS
+      return __unw_get_reg(cursor, (unw_regnum_t)(UNW_ARM_R0 + regno),
+                           (unw_word_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
     case _UVRSC_VFP:
@@ -827,28 +829,28 @@ _Unwind_VRS_Get_Internal(_Unwind_Context *context,
         // Can only touch d0-15 with FSTMFDX.
         if (regno > 15)
           return _UVRSR_FAILED;
-        unw_save_vfp_as_X(cursor);
+        __unw_save_vfp_as_X(cursor);
       } else {
         if (regno > 31)
           return _UVRSR_FAILED;
       }
-      return unw_get_fpreg(cursor, (unw_regnum_t)(UNW_ARM_D0 + regno),
-                           (unw_fpreg_t *)valuep) == UNW_ESUCCESS
+      return __unw_get_fpreg(cursor, (unw_regnum_t)(UNW_ARM_D0 + regno),
+                             (unw_fpreg_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
 #if defined(__ARM_WMMX)
     case _UVRSC_WMMXC:
       if (representation != _UVRSD_UINT32 || regno > 3)
         return _UVRSR_FAILED;
-      return unw_get_reg(cursor, (unw_regnum_t)(UNW_ARM_WC0 + regno),
-                         (unw_word_t *)valuep) == UNW_ESUCCESS
+      return __unw_get_reg(cursor, (unw_regnum_t)(UNW_ARM_WC0 + regno),
+                           (unw_word_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
     case _UVRSC_WMMXD:
       if (representation != _UVRSD_DOUBLE || regno > 31)
         return _UVRSR_FAILED;
-      return unw_get_fpreg(cursor, (unw_regnum_t)(UNW_ARM_WR0 + regno),
-                           (unw_fpreg_t *)valuep) == UNW_ESUCCESS
+      return __unw_get_fpreg(cursor, (unw_regnum_t)(UNW_ARM_WR0 + regno),
+                             (unw_fpreg_t *)valuep) == UNW_ESUCCESS
                  ? _UVRSR_OK
                  : _UVRSR_FAILED;
 #else
@@ -957,7 +959,7 @@ _Unwind_GetRegionStart(struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_proc_info_t frameInfo;
   uintptr_t result = 0;
-  if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
+  if (__unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
     result = (uintptr_t)frameInfo.start_ip;
   _LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%llX",
                        static_cast<void *>(context), (long long)result);
@@ -980,7 +982,7 @@ extern "C" _LIBUNWIND_EXPORT _Unwind_Reason_Code
 __gnu_unwind_frame(_Unwind_Exception *exception_object,
                    struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
-  if (unw_step(cursor) != UNW_STEP_SUCCESS)
+  if (__unw_step(cursor) != UNW_STEP_SUCCESS)
     return _URC_FAILURE;
   return _URC_OK;
 }
diff --git a/src/Unwind-seh.cpp b/src/Unwind-seh.cpp
index 8b4b7d5..7647f2e 100644
--- a/src/Unwind-seh.cpp
+++ b/src/Unwind-seh.cpp
@@ -58,9 +58,10 @@ static void seh_exc_cleanup(_Unwind_Reason_Code urc, _Unwind_Exception *exc) {
   free(exc);
 }
 
-static int _unw_init_seh(unw_cursor_t *cursor, CONTEXT *ctx);
-static DISPATCHER_CONTEXT *_unw_seh_get_disp_ctx(unw_cursor_t *cursor);
-static void _unw_seh_set_disp_ctx(unw_cursor_t *cursor, DISPATCHER_CONTEXT *disp);
+static int __unw_init_seh(unw_cursor_t *cursor, CONTEXT *ctx);
+static DISPATCHER_CONTEXT *__unw_seh_get_disp_ctx(unw_cursor_t *cursor);
+static void __unw_seh_set_disp_ctx(unw_cursor_t *cursor,
+                                   DISPATCHER_CONTEXT *disp);
 
 /// Common implementation of SEH-style handler functions used by Itanium-
 /// style frames.  Depending on how and why it was called, it may do one of:
@@ -113,9 +114,9 @@ _GCC_specific_handler(PEXCEPTION_RECORD ms_exc, PVOID frame, PCONTEXT ms_ctx,
     memset(exc->private_, 0, sizeof(exc->private_));
   }
   if (!ctx) {
-    _unw_init_seh(&cursor, disp->ContextRecord);
-    _unw_seh_set_disp_ctx(&cursor, disp);
-    unw_set_reg(&cursor, UNW_REG_IP, disp->ControlPc-1);
+    __unw_init_seh(&cursor, disp->ContextRecord);
+    __unw_seh_set_disp_ctx(&cursor, disp);
+    __unw_set_reg(&cursor, UNW_REG_IP, disp->ControlPc - 1);
     ctx = (struct _Unwind_Context *)&cursor;
 
     if (!IS_UNWINDING(ms_exc->ExceptionFlags)) {
@@ -172,18 +173,18 @@ _GCC_specific_handler(PEXCEPTION_RECORD ms_exc, PVOID frame, PCONTEXT ms_ctx,
       _LIBUNWIND_ABORT("Personality installed context during phase 1!");
 #ifdef __x86_64__
     exc->private_[2] = disp->TargetIp;
-    unw_get_reg(&cursor, UNW_X86_64_RAX, &retval);
-    unw_get_reg(&cursor, UNW_X86_64_RDX, &exc->private_[3]);
+    __unw_get_reg(&cursor, UNW_X86_64_RAX, &retval);
+    __unw_get_reg(&cursor, UNW_X86_64_RDX, &exc->private_[3]);
 #elif defined(__arm__)
     exc->private_[2] = disp->TargetPc;
-    unw_get_reg(&cursor, UNW_ARM_R0, &retval);
-    unw_get_reg(&cursor, UNW_ARM_R1, &exc->private_[3]);
+    __unw_get_reg(&cursor, UNW_ARM_R0, &retval);
+    __unw_get_reg(&cursor, UNW_ARM_R1, &exc->private_[3]);
 #elif defined(__aarch64__)
     exc->private_[2] = disp->TargetPc;
-    unw_get_reg(&cursor, UNW_ARM64_X0, &retval);
-    unw_get_reg(&cursor, UNW_ARM64_X1, &exc->private_[3]);
+    __unw_get_reg(&cursor, UNW_ARM64_X0, &retval);
+    __unw_get_reg(&cursor, UNW_ARM64_X1, &exc->private_[3]);
 #endif
-    unw_get_reg(&cursor, UNW_REG_IP, &target);
+    __unw_get_reg(&cursor, UNW_REG_IP, &target);
     ms_exc->ExceptionCode = STATUS_GCC_UNWIND;
 #ifdef __x86_64__
     ms_exc->ExceptionInformation[2] = disp->TargetIp;
@@ -203,7 +204,7 @@ _GCC_specific_handler(PEXCEPTION_RECORD ms_exc, PVOID frame, PCONTEXT ms_ctx,
   }
 }
 
-/// Personality function returned by \c unw_get_proc_info() in SEH contexts.
+/// Personality function returned by \c __unw_get_proc_info() in SEH contexts.
 /// This is a wrapper that calls the real SEH handler function, which in
 /// turn (at least, for Itanium-style frames) calls the real Itanium
 /// personality function (see \c _GCC_specific_handler()).
@@ -221,7 +222,8 @@ __libunwind_seh_personality(int version, _Unwind_Action state,
   ms_exc.ExceptionInformation[0] = (ULONG_PTR)exc;
   ms_exc.ExceptionInformation[1] = (ULONG_PTR)context;
   ms_exc.ExceptionInformation[2] = state;
-  DISPATCHER_CONTEXT *disp_ctx = _unw_seh_get_disp_ctx((unw_cursor_t *)context);
+  DISPATCHER_CONTEXT *disp_ctx =
+      __unw_seh_get_disp_ctx((unw_cursor_t *)context);
   EXCEPTION_DISPOSITION ms_act = disp_ctx->LanguageHandler(&ms_exc,
                                                            (PVOID)disp_ctx->EstablisherFrame,
                                                            disp_ctx->ContextRecord,
@@ -240,15 +242,15 @@ unwind_phase2_forced(unw_context_t *uc,
                      _Unwind_Exception *exception_object,
                      _Unwind_Stop_Fn stop, void *stop_parameter) {
   unw_cursor_t cursor2;
-  unw_init_local(&cursor2, uc);
+  __unw_init_local(&cursor2, uc);
 
   // Walk each frame until we reach where search phase said to stop
-  while (unw_step(&cursor2) > 0) {
+  while (__unw_step(&cursor2) > 0) {
 
     // Update info about this frame.
     unw_proc_info_t frameInfo;
-    if (unw_get_proc_info(&cursor2, &frameInfo) != UNW_ESUCCESS) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): unw_step "
+    if (__unw_get_proc_info(&cursor2, &frameInfo) != UNW_ESUCCESS) {
+      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): __unw_step "
                                  "failed => _URC_END_OF_STACK",
                                  (void *)exception_object);
       return _URC_FATAL_PHASE2_ERROR;
@@ -259,8 +261,8 @@ unwind_phase2_forced(unw_context_t *uc,
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf),
-                             &offset) != UNW_ESUCCESS) ||
+      if ((__unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf),
+                               &offset) != UNW_ESUCCESS) ||
           (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING(
@@ -310,7 +312,7 @@ unwind_phase2_forced(unw_context_t *uc,
                                    "_URC_INSTALL_CONTEXT",
                                    (void *)exception_object);
         // We may get control back if landing pad calls _Unwind_Resume().
-        unw_resume(&cursor2);
+        __unw_resume(&cursor2);
         break;
       default:
         // Personality routine returned an unknown result code.
@@ -375,7 +377,7 @@ _Unwind_Resume(_Unwind_Exception *exception_object) {
   if (exception_object->private_[0] != 0) {
     unw_context_t uc;
 
-    unw_getcontext(&uc);
+    __unw_getcontext(&uc);
     unwind_phase2_forced(&uc, exception_object,
                          (_Unwind_Stop_Fn) exception_object->private_[0],
                          (void *)exception_object->private_[4]);
@@ -413,7 +415,7 @@ _Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
   _LIBUNWIND_TRACE_API("_Unwind_ForcedUnwind(ex_obj=%p, stop=%p)",
                        (void *)exception_object, (void *)(uintptr_t)stop);
   unw_context_t uc;
-  unw_getcontext(&uc);
+  __unw_getcontext(&uc);
 
   // Mark that this is a forced unwind, so _Unwind_Resume() can do
   // the right thing.
@@ -427,7 +429,8 @@ _Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
 /// Called by personality handler during phase 2 to get LSDA for current frame.
 _LIBUNWIND_EXPORT uintptr_t
 _Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
-  uintptr_t result = (uintptr_t)_unw_seh_get_disp_ctx((unw_cursor_t *)context)->HandlerData;
+  uintptr_t result =
+      (uintptr_t)__unw_seh_get_disp_ctx((unw_cursor_t *)context)->HandlerData;
   _LIBUNWIND_TRACE_API(
       "_Unwind_GetLanguageSpecificData(context=%p) => 0x%" PRIxPTR,
       (void *)context, result);
@@ -438,15 +441,14 @@ _Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
 /// function.
 _LIBUNWIND_EXPORT uintptr_t
 _Unwind_GetRegionStart(struct _Unwind_Context *context) {
-  DISPATCHER_CONTEXT *disp = _unw_seh_get_disp_ctx((unw_cursor_t *)context);
+  DISPATCHER_CONTEXT *disp = __unw_seh_get_disp_ctx((unw_cursor_t *)context);
   uintptr_t result = (uintptr_t)disp->FunctionEntry->BeginAddress + disp->ImageBase;
   _LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%" PRIxPTR,
                        (void *)context, result);
   return result;
 }
 
-static int
-_unw_init_seh(unw_cursor_t *cursor, CONTEXT *context) {
+static int __unw_init_seh(unw_cursor_t *cursor, CONTEXT *context) {
 #ifdef _LIBUNWIND_TARGET_X86_64
   new (reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor))
       UnwindCursor<LocalAddressSpace, Registers_x86_64>(
@@ -473,8 +475,7 @@ _unw_init_seh(unw_cursor_t *cursor, CONTEXT *context) {
 #endif
 }
 
-static DISPATCHER_CONTEXT *
-_unw_seh_get_disp_ctx(unw_cursor_t *cursor) {
+static DISPATCHER_CONTEXT *__unw_seh_get_disp_ctx(unw_cursor_t *cursor) {
 #ifdef _LIBUNWIND_TARGET_X86_64
   return reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)->getDispatcherContext();
 #elif defined(_LIBUNWIND_TARGET_ARM)
@@ -486,8 +487,8 @@ _unw_seh_get_disp_ctx(unw_cursor_t *cursor) {
 #endif
 }
 
-static void
-_unw_seh_set_disp_ctx(unw_cursor_t *cursor, DISPATCHER_CONTEXT *disp) {
+static void __unw_seh_set_disp_ctx(unw_cursor_t *cursor,
+                                   DISPATCHER_CONTEXT *disp) {
 #ifdef _LIBUNWIND_TARGET_X86_64
   reinterpret_cast<UnwindCursor<LocalAddressSpace, Registers_x86_64> *>(cursor)->setDispatcherContext(disp);
 #elif defined(_LIBUNWIND_TARGET_ARM)
diff --git a/src/Unwind-sjlj.c b/src/Unwind-sjlj.c
index 2204161..b8bb7c8 100644
--- a/src/Unwind-sjlj.c
+++ b/src/Unwind-sjlj.c
@@ -177,9 +177,10 @@ unwind_phase2(struct _Unwind_Exception *exception_object) {
 
     // check for no more frames
     if (c == NULL) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
-                                 "bottom => _URC_END_OF_STACK",
-                                 (void *)exception_object);
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase2(ex_ojb=%p): __unw_step() reached "
+          "bottom => _URC_END_OF_STACK",
+          (void *)exception_object);
       return _URC_END_OF_STACK;
     }
 
@@ -215,7 +216,7 @@ unwind_phase2(struct _Unwind_Exception *exception_object) {
         // we may get control back if landing pad calls _Unwind_Resume()
         __Unwind_SjLj_SetTopOfFunctionStack(c);
         __builtin_longjmp(c->jbuf, 1);
-        // unw_resume() only returns if there was an error
+        // __unw_resume() only returns if there was an error
         return _URC_FATAL_PHASE2_ERROR;
       default:
         // something went wrong
@@ -242,9 +243,10 @@ unwind_phase2_forced(struct _Unwind_Exception *exception_object,
 
     // get next frame (skip over first which is _Unwind_RaiseException)
     if (c == NULL) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
-                                 "bottom => _URC_END_OF_STACK",
-                                 (void *)exception_object);
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase2(ex_ojb=%p): __unw_step() reached "
+          "bottom => _URC_END_OF_STACK",
+          (void *)exception_object);
       return _URC_END_OF_STACK;
     }
 
diff --git a/src/UnwindLevel1-gcc-ext.c b/src/UnwindLevel1-gcc-ext.c
index fc303a9..63e4083 100644
--- a/src/UnwindLevel1-gcc-ext.c
+++ b/src/UnwindLevel1-gcc-ext.c
@@ -93,10 +93,10 @@ _LIBUNWIND_EXPORT void *_Unwind_FindEnclosingFunction(void *pc) {
   unw_cursor_t cursor;
   unw_context_t uc;
   unw_proc_info_t info;
-  unw_getcontext(&uc);
-  unw_init_local(&cursor, &uc);
-  unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(intptr_t) pc);
-  if (unw_get_proc_info(&cursor, &info) == UNW_ESUCCESS)
+  __unw_getcontext(&uc);
+  __unw_init_local(&cursor, &uc);
+  __unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(intptr_t)pc);
+  if (__unw_get_proc_info(&cursor, &info) == UNW_ESUCCESS)
     return (void *)(intptr_t) info.start_ip;
   else
     return NULL;
@@ -108,8 +108,8 @@ _LIBUNWIND_EXPORT _Unwind_Reason_Code
 _Unwind_Backtrace(_Unwind_Trace_Fn callback, void *ref) {
   unw_cursor_t cursor;
   unw_context_t uc;
-  unw_getcontext(&uc);
-  unw_init_local(&cursor, &uc);
+  __unw_getcontext(&uc);
+  __unw_init_local(&cursor, &uc);
 
   _LIBUNWIND_TRACE_API("_Unwind_Backtrace(callback=%p)",
                        (void *)(uintptr_t)callback);
@@ -128,7 +128,7 @@ _Unwind_Backtrace(_Unwind_Trace_Fn callback, void *ref) {
 #if !defined(_LIBUNWIND_ARM_EHABI)
     // ask libunwind to get next frame (skip over first frame which is
     // _Unwind_Backtrace())
-    if (unw_step(&cursor) <= 0) {
+    if (__unw_step(&cursor) <= 0) {
       _LIBUNWIND_TRACE_UNWINDING(" _backtrace: ended because cursor reached "
                                  "bottom of stack, returning %d",
                                  _URC_END_OF_STACK);
@@ -137,7 +137,7 @@ _Unwind_Backtrace(_Unwind_Trace_Fn callback, void *ref) {
 #else
     // Get the information for this frame.
     unw_proc_info_t frameInfo;
-    if (unw_get_proc_info(&cursor, &frameInfo) != UNW_ESUCCESS) {
+    if (__unw_get_proc_info(&cursor, &frameInfo) != UNW_ESUCCESS) {
       return _URC_END_OF_STACK;
     }
 
@@ -164,8 +164,8 @@ _Unwind_Backtrace(_Unwind_Trace_Fn callback, void *ref) {
       char functionName[512];
       unw_proc_info_t frame;
       unw_word_t offset;
-      unw_get_proc_name(&cursor, functionName, 512, &offset);
-      unw_get_proc_info(&cursor, &frame);
+      __unw_get_proc_name(&cursor, functionName, 512, &offset);
+      __unw_get_proc_info(&cursor, &frame);
       _LIBUNWIND_TRACE_UNWINDING(
           " _backtrace: start_ip=0x%" PRIxPTR ", func=%s, lsda=0x%" PRIxPTR ", context=%p",
           frame.start_ip, functionName, frame.lsda,
@@ -191,10 +191,10 @@ _LIBUNWIND_EXPORT const void *_Unwind_Find_FDE(const void *pc,
   unw_cursor_t cursor;
   unw_context_t uc;
   unw_proc_info_t info;
-  unw_getcontext(&uc);
-  unw_init_local(&cursor, &uc);
-  unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(intptr_t) pc);
-  unw_get_proc_info(&cursor, &info);
+  __unw_getcontext(&uc);
+  __unw_init_local(&cursor, &uc);
+  __unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)(intptr_t)pc);
+  __unw_get_proc_info(&cursor, &info);
   bases->tbase = (uintptr_t)info.extra;
   bases->dbase = 0; // dbase not used on Mac OS X
   bases->func = (uintptr_t)info.start_ip;
@@ -208,7 +208,7 @@ _LIBUNWIND_EXPORT const void *_Unwind_Find_FDE(const void *pc,
 _LIBUNWIND_EXPORT uintptr_t _Unwind_GetCFA(struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_word_t result;
-  unw_get_reg(cursor, UNW_REG_SP, &result);
+  __unw_get_reg(cursor, UNW_REG_SP, &result);
   _LIBUNWIND_TRACE_API("_Unwind_GetCFA(context=%p) => 0x%" PRIxPTR,
                        (void *)context, result);
   return (uintptr_t)result;
@@ -233,7 +233,7 @@ _LIBUNWIND_EXPORT uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
 /// was broken until 10.6.
 _LIBUNWIND_EXPORT void __register_frame(const void *fde) {
   _LIBUNWIND_TRACE_API("__register_frame(%p)", fde);
-  _unw_add_dynamic_fde((unw_word_t)(uintptr_t) fde);
+  __unw_add_dynamic_fde((unw_word_t)(uintptr_t)fde);
 }
 
 
@@ -243,7 +243,7 @@ _LIBUNWIND_EXPORT void __register_frame(const void *fde) {
 /// was broken until 10.6.
 _LIBUNWIND_EXPORT void __deregister_frame(const void *fde) {
   _LIBUNWIND_TRACE_API("__deregister_frame(%p)", fde);
-  _unw_remove_dynamic_fde((unw_word_t)(uintptr_t) fde);
+  __unw_remove_dynamic_fde((unw_word_t)(uintptr_t)fde);
 }
 
 
diff --git a/src/UnwindLevel1.c b/src/UnwindLevel1.c
index 9d4084f..b3e30c4 100644
--- a/src/UnwindLevel1.c
+++ b/src/UnwindLevel1.c
@@ -25,9 +25,10 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "config.h"
 #include "libunwind.h"
+#include "libunwind_ext.h"
 #include "unwind.h"
-#include "config.h"
 
 #if !defined(_LIBUNWIND_ARM_EHABI) && !defined(__USING_SJLJ_EXCEPTIONS__)
 
@@ -35,33 +36,36 @@
 
 static _Unwind_Reason_Code
 unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *exception_object) {
-  unw_init_local(cursor, uc);
+  __unw_init_local(cursor, uc);
 
   // Walk each frame looking for a place to stop.
   bool handlerNotFound = true;
   while (handlerNotFound) {
     // Ask libunwind to get next frame (skip over first which is
     // _Unwind_RaiseException).
-    int stepResult = unw_step(cursor);
+    int stepResult = __unw_step(cursor);
     if (stepResult == 0) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_step() reached "
-                                 "bottom => _URC_END_OF_STACK",
-                                 (void *)exception_object);
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase1(ex_ojb=%p): __unw_step() reached "
+          "bottom => _URC_END_OF_STACK",
+          (void *)exception_object);
       return _URC_END_OF_STACK;
     } else if (stepResult < 0) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_step failed => "
-                                 "_URC_FATAL_PHASE1_ERROR",
-                                 (void *)exception_object);
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase1(ex_ojb=%p): __unw_step failed => "
+          "_URC_FATAL_PHASE1_ERROR",
+          (void *)exception_object);
       return _URC_FATAL_PHASE1_ERROR;
     }
 
     // See if frame has code to run (has personality routine).
     unw_proc_info_t frameInfo;
     unw_word_t sp;
-    if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_get_proc_info "
-                                 "failed => _URC_FATAL_PHASE1_ERROR",
-                                 (void *)exception_object);
+    if (__unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase1(ex_ojb=%p): __unw_get_proc_info "
+          "failed => _URC_FATAL_PHASE1_ERROR",
+          (void *)exception_object);
       return _URC_FATAL_PHASE1_ERROR;
     }
 
@@ -70,12 +74,12 @@ unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
-                             &offset) != UNW_ESUCCESS) ||
+      if ((__unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
+                               &offset) != UNW_ESUCCESS) ||
           (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       unw_word_t pc;
-      unw_get_reg(cursor, UNW_REG_IP, &pc);
+      __unw_get_reg(cursor, UNW_REG_IP, &pc);
       _LIBUNWIND_TRACE_UNWINDING(
           "unwind_phase1(ex_ojb=%p): pc=0x%" PRIxPTR ", start_ip=0x%" PRIxPTR
           ", func=%s, lsda=0x%" PRIxPTR ", personality=0x%" PRIxPTR "",
@@ -99,7 +103,7 @@ unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
         // found a catch clause or locals that need destructing in this frame
         // stop search and remember stack pointer at the frame
         handlerNotFound = false;
-        unw_get_reg(cursor, UNW_REG_SP, &sp);
+        __unw_get_reg(cursor, UNW_REG_SP, &sp);
         exception_object->private_2 = (uintptr_t)sp;
         _LIBUNWIND_TRACE_UNWINDING(
             "unwind_phase1(ex_ojb=%p): _URC_HANDLER_FOUND",
@@ -128,7 +132,7 @@ unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
 
 static _Unwind_Reason_Code
 unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *exception_object) {
-  unw_init_local(cursor, uc);
+  __unw_init_local(cursor, uc);
 
   _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p)",
                              (void *)exception_object);
@@ -138,27 +142,30 @@ unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
 
     // Ask libunwind to get next frame (skip over first which is
     // _Unwind_RaiseException).
-    int stepResult = unw_step(cursor);
+    int stepResult = __unw_step(cursor);
     if (stepResult == 0) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
-                                 "bottom => _URC_END_OF_STACK",
-                                 (void *)exception_object);
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase2(ex_ojb=%p): __unw_step() reached "
+          "bottom => _URC_END_OF_STACK",
+          (void *)exception_object);
       return _URC_END_OF_STACK;
     } else if (stepResult < 0) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step failed => "
-                                 "_URC_FATAL_PHASE1_ERROR",
-                                 (void *)exception_object);
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase2(ex_ojb=%p): __unw_step failed => "
+          "_URC_FATAL_PHASE1_ERROR",
+          (void *)exception_object);
       return _URC_FATAL_PHASE2_ERROR;
     }
 
     // Get info about this frame.
     unw_word_t sp;
     unw_proc_info_t frameInfo;
-    unw_get_reg(cursor, UNW_REG_SP, &sp);
-    if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_get_proc_info "
-                                 "failed => _URC_FATAL_PHASE1_ERROR",
-                                 (void *)exception_object);
+    __unw_get_reg(cursor, UNW_REG_SP, &sp);
+    if (__unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
+      _LIBUNWIND_TRACE_UNWINDING(
+          "unwind_phase2(ex_ojb=%p): __unw_get_proc_info "
+          "failed => _URC_FATAL_PHASE1_ERROR",
+          (void *)exception_object);
       return _URC_FATAL_PHASE2_ERROR;
     }
 
@@ -167,8 +174,8 @@ unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
-                             &offset) != UNW_ESUCCESS) ||
+      if ((__unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
+                               &offset) != UNW_ESUCCESS) ||
           (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): start_ip=0x%" PRIxPTR
@@ -211,15 +218,15 @@ unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *except
         // We may get control back if landing pad calls _Unwind_Resume().
         if (_LIBUNWIND_TRACING_UNWINDING) {
           unw_word_t pc;
-          unw_get_reg(cursor, UNW_REG_IP, &pc);
-          unw_get_reg(cursor, UNW_REG_SP, &sp);
+          __unw_get_reg(cursor, UNW_REG_IP, &pc);
+          __unw_get_reg(cursor, UNW_REG_SP, &sp);
           _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): re-entering "
                                      "user code with ip=0x%" PRIxPTR
                                      ", sp=0x%" PRIxPTR,
                                      (void *)exception_object, pc, sp);
         }
-        unw_resume(cursor);
-        // unw_resume() only returns if there was an error.
+        __unw_resume(cursor);
+        // __unw_resume() only returns if there was an error.
         return _URC_FATAL_PHASE2_ERROR;
       default:
         // Personality routine returned an unknown result code.
@@ -239,15 +246,15 @@ static _Unwind_Reason_Code
 unwind_phase2_forced(unw_context_t *uc, unw_cursor_t *cursor,
                      _Unwind_Exception *exception_object,
                      _Unwind_Stop_Fn stop, void *stop_parameter) {
-  unw_init_local(cursor, uc);
+  __unw_init_local(cursor, uc);
 
   // Walk each frame until we reach where search phase said to stop
-  while (unw_step(cursor) > 0) {
+  while (__unw_step(cursor) > 0) {
 
     // Update info about this frame.
     unw_proc_info_t frameInfo;
-    if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
-      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): unw_step "
+    if (__unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
+      _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): __unw_step "
                                  "failed => _URC_END_OF_STACK",
                                  (void *)exception_object);
       return _URC_FATAL_PHASE2_ERROR;
@@ -258,8 +265,8 @@ unwind_phase2_forced(unw_context_t *uc, unw_cursor_t *cursor,
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
-                             &offset) != UNW_ESUCCESS) ||
+      if ((__unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
+                               &offset) != UNW_ESUCCESS) ||
           (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING(
@@ -309,7 +316,7 @@ unwind_phase2_forced(unw_context_t *uc, unw_cursor_t *cursor,
                                    "_URC_INSTALL_CONTEXT",
                                    (void *)exception_object);
         // We may get control back if landing pad calls _Unwind_Resume().
-        unw_resume(cursor);
+        __unw_resume(cursor);
         break;
       default:
         // Personality routine returned an unknown result code.
@@ -345,7 +352,7 @@ _Unwind_RaiseException(_Unwind_Exception *exception_object) {
                        (void *)exception_object);
   unw_context_t uc;
   unw_cursor_t cursor;
-  unw_getcontext(&uc);
+  __unw_getcontext(&uc);
 
   // Mark that this is a non-forced unwind, so _Unwind_Resume()
   // can do the right thing.
@@ -379,7 +386,7 @@ _Unwind_Resume(_Unwind_Exception *exception_object) {
   _LIBUNWIND_TRACE_API("_Unwind_Resume(ex_obj=%p)", (void *)exception_object);
   unw_context_t uc;
   unw_cursor_t cursor;
-  unw_getcontext(&uc);
+  __unw_getcontext(&uc);
 
   if (exception_object->private_1 != 0)
     unwind_phase2_forced(&uc, &cursor, exception_object,
@@ -404,7 +411,7 @@ _Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
                        (void *)exception_object, (void *)(uintptr_t)stop);
   unw_context_t uc;
   unw_cursor_t cursor;
-  unw_getcontext(&uc);
+  __unw_getcontext(&uc);
 
   // Mark that this is a forced unwind, so _Unwind_Resume() can do
   // the right thing.
@@ -422,7 +429,7 @@ _Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_proc_info_t frameInfo;
   uintptr_t result = 0;
-  if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
+  if (__unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
     result = (uintptr_t)frameInfo.lsda;
   _LIBUNWIND_TRACE_API(
       "_Unwind_GetLanguageSpecificData(context=%p) => 0x%" PRIxPTR,
@@ -443,7 +450,7 @@ _Unwind_GetRegionStart(struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_proc_info_t frameInfo;
   uintptr_t result = 0;
-  if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
+  if (__unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
     result = (uintptr_t)frameInfo.start_ip;
   _LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%" PRIxPTR,
                        (void *)context, result);
@@ -468,7 +475,7 @@ _LIBUNWIND_EXPORT uintptr_t
 _Unwind_GetGR(struct _Unwind_Context *context, int index) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_word_t result;
-  unw_get_reg(cursor, index, &result);
+  __unw_get_reg(cursor, index, &result);
   _LIBUNWIND_TRACE_API("_Unwind_GetGR(context=%p, reg=%d) => 0x%" PRIxPTR,
                        (void *)context, index, result);
   return (uintptr_t)result;
@@ -481,14 +488,14 @@ _LIBUNWIND_EXPORT void _Unwind_SetGR(struct _Unwind_Context *context, int index,
                        ")",
                        (void *)context, index, value);
   unw_cursor_t *cursor = (unw_cursor_t *)context;
-  unw_set_reg(cursor, index, value);
+  __unw_set_reg(cursor, index, value);
 }
 
 /// Called by personality handler during phase 2 to get instruction pointer.
 _LIBUNWIND_EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_word_t result;
-  unw_get_reg(cursor, UNW_REG_IP, &result);
+  __unw_get_reg(cursor, UNW_REG_IP, &result);
   _LIBUNWIND_TRACE_API("_Unwind_GetIP(context=%p) => 0x%" PRIxPTR,
                        (void *)context, result);
   return (uintptr_t)result;
@@ -502,7 +509,7 @@ _LIBUNWIND_EXPORT void _Unwind_SetIP(struct _Unwind_Context *context,
   _LIBUNWIND_TRACE_API("_Unwind_SetIP(context=%p, value=0x%0" PRIxPTR ")",
                        (void *)context, value);
   unw_cursor_t *cursor = (unw_cursor_t *)context;
-  unw_set_reg(cursor, UNW_REG_IP, value);
+  __unw_set_reg(cursor, UNW_REG_IP, value);
 }
 
 #endif // !defined(_LIBUNWIND_ARM_EHABI) && !defined(__USING_SJLJ_EXCEPTIONS__)
diff --git a/src/UnwindRegistersRestore.S b/src/UnwindRegistersRestore.S
index ead6454..bcb6add 100644
--- a/src/UnwindRegistersRestore.S
+++ b/src/UnwindRegistersRestore.S
@@ -13,7 +13,7 @@
 #if !defined(__USING_SJLJ_EXCEPTIONS__)
 
 #if defined(__i386__)
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_x866jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_x866jumptoEv)
 #
 # void libunwind::Registers_x86::jumpto()
 #
@@ -60,7 +60,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_x866jumptoEv)
 
 #elif defined(__x86_64__)
 
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind16Registers_x86_646jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind16Registers_x86_646jumptoEv)
 #
 # void libunwind::Registers_x86_64::jumpto()
 #
@@ -129,7 +129,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind16Registers_x86_646jumptoEv)
 
 #elif defined(__powerpc64__)
 
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_ppc646jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind15Registers_ppc646jumptoEv)
 //
 // void libunwind::Registers_ppc64::jumpto()
 //
@@ -394,7 +394,7 @@ Lnovec:
 
 #elif defined(__ppc__)
 
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_ppc6jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_ppc6jumptoEv)
 ;
 ; void libunwind::Registers_ppc::jumpto()
 ;
@@ -566,7 +566,7 @@ Lnovec:
 //  thread_state pointer is in x0
 //
   .p2align 2
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_arm646jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind15Registers_arm646jumptoEv)
   // skip restore of x0,x1 for now
   ldp    x2, x3,  [x0, #0x010]
   ldp    x4, x5,  [x0, #0x020]
@@ -620,7 +620,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_arm646jumptoEv)
 @  thread_state pointer is in r0
 @
   .p2align 2
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm20restoreCoreAndJumpToEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm20restoreCoreAndJumpToEv)
 #if !defined(__ARM_ARCH_ISA_ARM) && __ARM_ARCH_ISA_THUMB == 1
   @ r8-r11: ldm into r1-r4, then mov to r8-r11
   adds r0, #0x20
@@ -658,7 +658,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm20restoreCoreAndJu
 #if defined(__ELF__)
   .fpu vfpv3-d16
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm19restoreVFPWithFLDMDEPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm19restoreVFPWithFLDMDEPv)
   @ VFP and iwMMX instructions are only available when compiling with the flags
   @ that enable them. We do not want to do that in the library (because we do not
   @ want the compiler to generate instructions that access those) but this is
@@ -679,7 +679,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm19restoreVFPWithFL
 #if defined(__ELF__)
   .fpu vfpv3-d16
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm19restoreVFPWithFLDMXEPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm19restoreVFPWithFLDMXEPv)
   vldmia r0, {d0-d15} @ fldmiax is deprecated in ARMv7+ and now behaves like vldmia
   JMP(lr)
 
@@ -693,7 +693,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm19restoreVFPWithFL
 #if defined(__ELF__)
   .fpu vfpv3
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm12restoreVFPv3EPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm12restoreVFPv3EPv)
   vldmia r0, {d16-d31}
   JMP(lr)
 
@@ -709,7 +709,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm12restoreVFPv3EPv)
 #if defined(__ELF__)
   .arch armv5te
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm12restoreiWMMXEPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm12restoreiWMMXEPv)
   ldcl p1, cr0, [r0], #8  @ wldrd wR0, [r0], #8
   ldcl p1, cr1, [r0], #8  @ wldrd wR1, [r0], #8
   ldcl p1, cr2, [r0], #8  @ wldrd wR2, [r0], #8
@@ -738,7 +738,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm12restoreiWMMXEPv)
 #if defined(__ELF__)
   .arch armv5te
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm19restoreiWMMXControlEPj)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm19restoreiWMMXControlEPj)
   ldc2 p1, cr8, [r0], #4  @ wldrw wCGR0, [r0], #4
   ldc2 p1, cr9, [r0], #4  @ wldrw wCGR1, [r0], #4
   ldc2 p1, cr10, [r0], #4  @ wldrw wCGR2, [r0], #4
@@ -749,7 +749,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm19restoreiWMMXCont
 
 #elif defined(__or1k__)
 
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind14Registers_or1k6jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind14Registers_or1k6jumptoEv)
 #
 # void libunwind::Registers_or1k::jumpto()
 #
@@ -808,7 +808,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind14Registers_or1k6jumptoEv)
 // On entry:
 //  thread state pointer is in a0 ($4)
 //
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind18Registers_mips_o326jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind18Registers_mips_o326jumptoEv)
   .set push
   .set noat
   .set noreorder
@@ -917,7 +917,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind18Registers_mips_o326jumptoEv)
 // On entry:
 //  thread state pointer is in a0 ($4)
 //
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind21Registers_mips_newabi6jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind21Registers_mips_newabi6jumptoEv)
   .set push
   .set noat
   .set noreorder
@@ -1007,7 +1007,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind21Registers_mips_newabi6jumptoEv)
 // On entry:
 //  thread_state pointer is in o0
 //
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_sparc6jumptoEv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind15Registers_sparc6jumptoEv)
   ta 3
   ldd [%o0 + 64],  %l0
   ldd [%o0 + 72],  %l2
diff --git a/src/UnwindRegistersSave.S b/src/UnwindRegistersSave.S
index c7c4959..7db023c 100644
--- a/src/UnwindRegistersSave.S
+++ b/src/UnwindRegistersSave.S
@@ -15,7 +15,7 @@
 #if defined(__i386__)
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # On entry:
 #   +                       +
@@ -26,7 +26,7 @@
 #   +-----------------------+   <-- SP
 #   +                       +
 #
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   push  %eax
   movl  8(%esp), %eax
   movl  %ebx,  4(%eax)
@@ -56,12 +56,12 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #elif defined(__x86_64__)
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # On entry:
 #  thread_state pointer is in rdi
 #
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
 #if defined(_WIN64)
 #define PTR %rcx
 #define TMP %rdx
@@ -118,12 +118,12 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #elif defined(__mips__) && defined(_ABIO32) && _MIPS_SIM == _ABIO32
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # On entry:
 #  thread_state pointer is in a0 ($4)
 #
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   .set push
   .set noat
   .set noreorder
@@ -227,12 +227,12 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #elif defined(__mips64)
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # On entry:
 #  thread_state pointer is in a0 ($4)
 #
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   .set push
   .set noat
   .set noreorder
@@ -317,21 +317,21 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 # elif defined(__mips__)
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # Just trap for the time being.
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   teq $0, $0
 
 #elif defined(__powerpc64__)
 
 //
-// extern int unw_getcontext(unw_context_t* thread_state)
+// extern int __unw_getcontext(unw_context_t* thread_state)
 //
 // On entry:
 //  thread_state pointer is in r3
 //
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
 
 // store register (GPR)
 #define PPC64_STR(n) \
@@ -557,12 +557,12 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #elif defined(__ppc__)
 
 ;
-; extern int unw_getcontext(unw_context_t* thread_state)
+; extern int __unw_getcontext(unw_context_t* thread_state)
 ;
 ; On entry:
 ;  thread_state pointer is in r3
 ;
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   stw    r0,  8(r3)
   mflr  r0
   stw    r0,  0(r3)  ; store lr as ssr0
@@ -700,13 +700,13 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #elif defined(__arm64__) || defined(__aarch64__)
 
 //
-// extern int unw_getcontext(unw_context_t* thread_state)
+// extern int __unw_getcontext(unw_context_t* thread_state)
 //
 // On entry:
 //  thread_state pointer is in x0
 //
   .p2align 2
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   stp    x0, x1,  [x0, #0x000]
   stp    x2, x3,  [x0, #0x010]
   stp    x4, x5,  [x0, #0x020]
@@ -754,7 +754,7 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #endif
 
 @
-@ extern int unw_getcontext(unw_context_t* thread_state)
+@ extern int __unw_getcontext(unw_context_t* thread_state)
 @
 @ On entry:
 @  thread_state pointer is in r0
@@ -763,10 +763,10 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 @ EHABI #7.4.5 notes that in general all VRS registers should be restored
 @ however this is very hard to do for VFP registers because it is unknown
 @ to the library how many registers are implemented by the architecture.
-@ Instead, VFP registers are demand saved by logic external to unw_getcontext.
+@ Instead, VFP registers are demand saved by logic external to __unw_getcontext.
 @
   .p2align 2
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
 #if !defined(__ARM_ARCH_ISA_ARM) && __ARM_ARCH_ISA_THUMB == 1
   stm r0!, {r0-r7}
   mov r1, r8
@@ -807,7 +807,7 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #if defined(__ELF__)
   .fpu vfpv3-d16
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm16saveVFPWithFSTMDEPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm16saveVFPWithFSTMDEPv)
   vstmia r0, {d0-d15}
   JMP(lr)
 
@@ -821,7 +821,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm16saveVFPWithFSTMD
 #if defined(__ELF__)
   .fpu vfpv3-d16
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm16saveVFPWithFSTMXEPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm16saveVFPWithFSTMXEPv)
   vstmia r0, {d0-d15} @ fstmiax is deprecated in ARMv7+ and now behaves like vstmia
   JMP(lr)
 
@@ -835,7 +835,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm16saveVFPWithFSTMX
 #if defined(__ELF__)
   .fpu vfpv3
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm9saveVFPv3EPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm9saveVFPv3EPv)
   @ VFP and iwMMX instructions are only available when compiling with the flags
   @ that enable them. We do not want to do that in the library (because we do not
   @ want the compiler to generate instructions that access those) but this is
@@ -858,7 +858,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm9saveVFPv3EPv)
 #if defined(__ELF__)
   .arch armv5te
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm9saveiWMMXEPv)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm9saveiWMMXEPv)
   stcl p1, cr0, [r0], #8  @ wstrd wR0, [r0], #8
   stcl p1, cr1, [r0], #8  @ wstrd wR1, [r0], #8
   stcl p1, cr2, [r0], #8  @ wstrd wR2, [r0], #8
@@ -887,7 +887,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm9saveiWMMXEPv)
 #if defined(__ELF__)
   .arch armv5te
 #endif
-DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm16saveiWMMXControlEPj)
+DEFINE_LIBUNWIND_FUNCTION(_ZN9libunwind13Registers_arm16saveiWMMXControlEPj)
   stc2 p1, cr8, [r0], #4  @ wstrw wCGR0, [r0], #4
   stc2 p1, cr9, [r0], #4  @ wstrw wCGR1, [r0], #4
   stc2 p1, cr10, [r0], #4  @ wstrw wCGR2, [r0], #4
@@ -899,12 +899,12 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind13Registers_arm16saveiWMMXControl
 #elif defined(__or1k__)
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # On entry:
 #  thread_state pointer is in r3
 #
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   l.sw       0(r3), r0
   l.sw       4(r3), r1
   l.sw       8(r3), r2
@@ -945,12 +945,12 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #elif defined(__sparc__)
 
 #
-# extern int unw_getcontext(unw_context_t* thread_state)
+# extern int __unw_getcontext(unw_context_t* thread_state)
 #
 # On entry:
 #  thread_state pointer is in o0
 #
-DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
   ta 3
   add %o7, 8, %o7
   std %g0, [%o0 +   0]
@@ -974,4 +974,6 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
 #endif
 #endif /* !defined(__USING_SJLJ_EXCEPTIONS__) */
 
+  WEAK_ALIAS(__unw_getcontext, unw_getcontext)
+
 NO_EXEC_STACK_DIRECTIVE
diff --git a/src/assembly.h b/src/assembly.h
index a15b89f..606cf2c 100644
--- a/src/assembly.h
+++ b/src/assembly.h
@@ -45,6 +45,11 @@
 #define SYMBOL_IS_FUNC(name)
 #define EXPORT_SYMBOL(name)
 #define HIDDEN_SYMBOL(name) .private_extern name
+#define WEAK_SYMBOL(name) .weak_reference name
+#define WEAK_ALIAS(name, aliasname)                                            \
+  WEAK_SYMBOL(aliasname) SEPARATOR                                             \
+  SYMBOL_NAME(aliasname) = SYMBOL_NAME(name)
+
 #define NO_EXEC_STACK_DIRECTIVE
 
 #elif defined(__ELF__)
@@ -56,6 +61,10 @@
 #endif
 #define EXPORT_SYMBOL(name)
 #define HIDDEN_SYMBOL(name) .hidden name
+#define WEAK_SYMBOL(name) .weak name
+#define WEAK_ALIAS(name, aliasname)                                            \
+  WEAK_SYMBOL(aliasname) SEPARATOR                                             \
+  SYMBOL_NAME(aliasname) = SYMBOL_NAME(name)
 
 #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
     defined(__linux__)
@@ -71,9 +80,9 @@
     .scl 2 SEPARATOR                                                           \
     .type 32 SEPARATOR                                                         \
   .endef
-#define EXPORT_SYMBOL2(name)                              \
-  .section .drectve,"yn" SEPARATOR                        \
-  .ascii "-export:", #name, "\0" SEPARATOR                \
+#define EXPORT_SYMBOL2(name)                                                   \
+  .section .drectve,"yn" SEPARATOR                                             \
+  .ascii "-export:", #name, "\0" SEPARATOR                                     \
   .text
 #if defined(_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS)
 #define EXPORT_SYMBOL(name)
@@ -82,6 +91,23 @@
 #endif
 #define HIDDEN_SYMBOL(name)
 
+#if defined(__MINGW32__)
+#define WEAK_ALIAS(name, aliasname)                                            \
+  .globl SYMBOL_NAME(aliasname) SEPARATOR                                      \
+  EXPORT_SYMBOL(aliasname) SEPARATOR                                           \
+  SYMBOL_NAME(aliasname) = SYMBOL_NAME(name)
+#else
+#define WEAK_ALIAS3(name, aliasname)                                           \
+  .section .drectve,"yn" SEPARATOR                                             \
+  .ascii "-alternatename:", #aliasname, "=", #name, "\0" SEPARATOR             \
+  .text
+#define WEAK_ALIAS2(name, aliasname)                                           \
+  WEAK_ALIAS3(name, aliasname)
+#define WEAK_ALIAS(name, aliasname)                                            \
+  EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR                              \
+  WEAK_ALIAS2(SYMBOL_NAME(name), SYMBOL_NAME(aliasname))
+#endif
+
 #define NO_EXEC_STACK_DIRECTIVE
 
 #elif defined(__sparc__)
@@ -92,16 +118,10 @@
 
 #endif
 
-#define DEFINE_LIBUNWIND_FUNCTION(name)                   \
-  .globl SYMBOL_NAME(name) SEPARATOR                      \
-  EXPORT_SYMBOL(name) SEPARATOR                           \
-  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR             \
-  SYMBOL_NAME(name):
-
-#define DEFINE_LIBUNWIND_PRIVATE_FUNCTION(name)           \
-  .globl SYMBOL_NAME(name) SEPARATOR                      \
-  HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR              \
-  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR             \
+#define DEFINE_LIBUNWIND_FUNCTION(name)                                        \
+  .globl SYMBOL_NAME(name) SEPARATOR                                           \
+  HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR                                   \
+  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
   SYMBOL_NAME(name):
 
 #if defined(__arm__)
diff --git a/src/config.h b/src/config.h
index c2fff50..dbc52d0 100644
--- a/src/config.h
+++ b/src/config.h
@@ -62,6 +62,36 @@
   #endif
 #endif
 
+#define STR(a) #a
+#define XSTR(a) STR(a)
+#define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name
+
+#if defined(__APPLE__)
+#define _LIBUNWIND_WEAK_ALIAS(name, aliasname)                                 \
+  __asm__(".globl " SYMBOL_NAME(aliasname));                                   \
+  __asm__(SYMBOL_NAME(aliasname) " = " SYMBOL_NAME(name));                     \
+  _LIBUNWIND_EXPORT                                                            \
+  extern "C" __typeof(name) aliasname __attribute__((weak_import));
+#elif defined(__ELF__)
+#define _LIBUNWIND_WEAK_ALIAS(name, aliasname)                                 \
+  _LIBUNWIND_EXPORT                                                            \
+  extern "C" __typeof(name) aliasname __attribute__((weak, alias(#name)));
+#elif defined(_WIN32)
+#if defined(__MINGW32__)
+#define _LIBUNWIND_WEAK_ALIAS(name, aliasname)                                 \
+  _LIBUNWIND_EXPORT                                                            \
+  extern "C" __typeof(name) aliasname __attribute__((alias(#name)));
+#else
+#define _LIBUNWIND_WEAK_ALIAS(name, aliasname)                                 \
+  __pragma(comment(linker, "/alternatename:" SYMBOL_NAME(aliasname) "="        \
+                                             SYMBOL_NAME(name)))               \
+  _LIBUNWIND_EXPORT \
+  extern "C" __typeof(name) aliasname;
+#endif
+#else
+#error Unsupported target
+#endif
+
 #if (defined(__APPLE__) && defined(__arm__)) || defined(__USING_SJLJ_EXCEPTIONS__)
 #define _LIBUNWIND_BUILD_SJLJ_APIS
 #endif
diff --git a/src/libunwind.cpp b/src/libunwind.cpp
index 03dfeae..5f99337 100644
--- a/src/libunwind.cpp
+++ b/src/libunwind.cpp
@@ -29,15 +29,11 @@ LocalAddressSpace LocalAddressSpace::sThisAddressSpace;
 _LIBUNWIND_EXPORT unw_addr_space_t unw_local_addr_space =
     (unw_addr_space_t)&LocalAddressSpace::sThisAddressSpace;
 
-/// record the registers and stack position of the caller
-extern int unw_getcontext(unw_context_t *);
-// note: unw_getcontext() implemented in assembly
-
 /// Create a cursor of a thread in this process given 'context' recorded by
-/// unw_getcontext().
-_LIBUNWIND_EXPORT int unw_init_local(unw_cursor_t *cursor,
-                                     unw_context_t *context) {
-  _LIBUNWIND_TRACE_API("unw_init_local(cursor=%p, context=%p)",
+/// __unw_getcontext().
+_LIBUNWIND_HIDDEN int __unw_init_local(unw_cursor_t *cursor,
+                                       unw_context_t *context) {
+  _LIBUNWIND_TRACE_API("__unw_init_local(cursor=%p, context=%p)",
                        static_cast<void *>(cursor),
                        static_cast<void *>(context));
 #if defined(__i386__)
@@ -75,11 +71,12 @@ _LIBUNWIND_EXPORT int unw_init_local(unw_cursor_t *cursor,
 
   return UNW_ESUCCESS;
 }
+_LIBUNWIND_WEAK_ALIAS(__unw_init_local, unw_init_local)
 
 /// Get value of specified register at cursor position in stack frame.
-_LIBUNWIND_EXPORT int unw_get_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
-                                  unw_word_t *value) {
-  _LIBUNWIND_TRACE_API("unw_get_reg(cursor=%p, regNum=%d, &value=%p)",
+_LIBUNWIND_HIDDEN int __unw_get_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
+                                    unw_word_t *value) {
+  _LIBUNWIND_TRACE_API("__unw_get_reg(cursor=%p, regNum=%d, &value=%p)",
                        static_cast<void *>(cursor), regNum,
                        static_cast<void *>(value));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
@@ -89,12 +86,13 @@ _LIBUNWIND_EXPORT int unw_get_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
   }
   return UNW_EBADREG;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_get_reg, unw_get_reg)
 
 /// Set value of specified register at cursor position in stack frame.
-_LIBUNWIND_EXPORT int unw_set_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
-                                  unw_word_t value) {
-  _LIBUNWIND_TRACE_API("unw_set_reg(cursor=%p, regNum=%d, value=0x%" PRIxPTR ")",
+_LIBUNWIND_HIDDEN int __unw_set_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
+                                    unw_word_t value) {
+  _LIBUNWIND_TRACE_API("__unw_set_reg(cursor=%p, regNum=%d, value=0x%" PRIxPTR
+                       ")",
                        static_cast<void *>(cursor), regNum, value);
   typedef LocalAddressSpace::pint_t pint_t;
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
@@ -120,12 +118,12 @@ _LIBUNWIND_EXPORT int unw_set_reg(unw_cursor_t *cursor, unw_regnum_t regNum,
   }
   return UNW_EBADREG;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_set_reg, unw_set_reg)
 
 /// Get value of specified float register at cursor position in stack frame.
-_LIBUNWIND_EXPORT int unw_get_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
-                                    unw_fpreg_t *value) {
-  _LIBUNWIND_TRACE_API("unw_get_fpreg(cursor=%p, regNum=%d, &value=%p)",
+_LIBUNWIND_HIDDEN int __unw_get_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
+                                      unw_fpreg_t *value) {
+  _LIBUNWIND_TRACE_API("__unw_get_fpreg(cursor=%p, regNum=%d, &value=%p)",
                        static_cast<void *>(cursor), regNum,
                        static_cast<void *>(value));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
@@ -135,16 +133,16 @@ _LIBUNWIND_EXPORT int unw_get_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
   }
   return UNW_EBADREG;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_get_fpreg, unw_get_fpreg)
 
 /// Set value of specified float register at cursor position in stack frame.
-_LIBUNWIND_EXPORT int unw_set_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
-                                    unw_fpreg_t value) {
+_LIBUNWIND_HIDDEN int __unw_set_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
+                                      unw_fpreg_t value) {
 #if defined(_LIBUNWIND_ARM_EHABI)
-  _LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%llX)",
+  _LIBUNWIND_TRACE_API("__unw_set_fpreg(cursor=%p, regNum=%d, value=%llX)",
                        static_cast<void *>(cursor), regNum, value);
 #else
-  _LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%g)",
+  _LIBUNWIND_TRACE_API("__unw_set_fpreg(cursor=%p, regNum=%d, value=%g)",
                        static_cast<void *>(cursor), regNum, value);
 #endif
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
@@ -154,20 +152,20 @@ _LIBUNWIND_EXPORT int unw_set_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
   }
   return UNW_EBADREG;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_set_fpreg, unw_set_fpreg)
 
 /// Move cursor to next frame.
-_LIBUNWIND_EXPORT int unw_step(unw_cursor_t *cursor) {
-  _LIBUNWIND_TRACE_API("unw_step(cursor=%p)", static_cast<void *>(cursor));
+_LIBUNWIND_HIDDEN int __unw_step(unw_cursor_t *cursor) {
+  _LIBUNWIND_TRACE_API("__unw_step(cursor=%p)", static_cast<void *>(cursor));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->step();
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_step, unw_step)
 
 /// Get unwind info at cursor position in stack frame.
-_LIBUNWIND_EXPORT int unw_get_proc_info(unw_cursor_t *cursor,
-                                        unw_proc_info_t *info) {
-  _LIBUNWIND_TRACE_API("unw_get_proc_info(cursor=%p, &info=%p)",
+_LIBUNWIND_HIDDEN int __unw_get_proc_info(unw_cursor_t *cursor,
+                                          unw_proc_info_t *info) {
+  _LIBUNWIND_TRACE_API("__unw_get_proc_info(cursor=%p, &info=%p)",
                        static_cast<void *>(cursor), static_cast<void *>(info));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   co->getInfo(info);
@@ -176,21 +174,21 @@ _LIBUNWIND_EXPORT int unw_get_proc_info(unw_cursor_t *cursor,
   else
     return UNW_ESUCCESS;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_get_proc_info, unw_get_proc_info)
 
 /// Resume execution at cursor position (aka longjump).
-_LIBUNWIND_EXPORT int unw_resume(unw_cursor_t *cursor) {
-  _LIBUNWIND_TRACE_API("unw_resume(cursor=%p)", static_cast<void *>(cursor));
+_LIBUNWIND_HIDDEN int __unw_resume(unw_cursor_t *cursor) {
+  _LIBUNWIND_TRACE_API("__unw_resume(cursor=%p)", static_cast<void *>(cursor));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   co->jumpto();
   return UNW_EUNSPEC;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_resume, unw_resume)
 
 /// Get name of function at cursor position in stack frame.
-_LIBUNWIND_EXPORT int unw_get_proc_name(unw_cursor_t *cursor, char *buf,
-                                        size_t bufLen, unw_word_t *offset) {
-  _LIBUNWIND_TRACE_API("unw_get_proc_name(cursor=%p, &buf=%p, bufLen=%lu)",
+_LIBUNWIND_HIDDEN int __unw_get_proc_name(unw_cursor_t *cursor, char *buf,
+                                          size_t bufLen, unw_word_t *offset) {
+  _LIBUNWIND_TRACE_API("__unw_get_proc_name(cursor=%p, &buf=%p, bufLen=%lu)",
                        static_cast<void *>(cursor), static_cast<void *>(buf),
                        static_cast<unsigned long>(bufLen));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
@@ -199,58 +197,62 @@ _LIBUNWIND_EXPORT int unw_get_proc_name(unw_cursor_t *cursor, char *buf,
   else
     return UNW_EUNSPEC;
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_get_proc_name, unw_get_proc_name)
 
 /// Checks if a register is a floating-point register.
-_LIBUNWIND_EXPORT int unw_is_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum) {
-  _LIBUNWIND_TRACE_API("unw_is_fpreg(cursor=%p, regNum=%d)",
+_LIBUNWIND_HIDDEN int __unw_is_fpreg(unw_cursor_t *cursor,
+                                     unw_regnum_t regNum) {
+  _LIBUNWIND_TRACE_API("__unw_is_fpreg(cursor=%p, regNum=%d)",
                        static_cast<void *>(cursor), regNum);
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->validFloatReg(regNum);
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_is_fpreg, unw_is_fpreg)
 
 /// Checks if a register is a floating-point register.
-_LIBUNWIND_EXPORT const char *unw_regname(unw_cursor_t *cursor,
-                                          unw_regnum_t regNum) {
-  _LIBUNWIND_TRACE_API("unw_regname(cursor=%p, regNum=%d)",
+_LIBUNWIND_HIDDEN const char *__unw_regname(unw_cursor_t *cursor,
+                                            unw_regnum_t regNum) {
+  _LIBUNWIND_TRACE_API("__unw_regname(cursor=%p, regNum=%d)",
                        static_cast<void *>(cursor), regNum);
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->getRegisterName(regNum);
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_regname, unw_regname)
 
 /// Checks if current frame is signal trampoline.
-_LIBUNWIND_EXPORT int unw_is_signal_frame(unw_cursor_t *cursor) {
-  _LIBUNWIND_TRACE_API("unw_is_signal_frame(cursor=%p)",
+_LIBUNWIND_HIDDEN int __unw_is_signal_frame(unw_cursor_t *cursor) {
+  _LIBUNWIND_TRACE_API("__unw_is_signal_frame(cursor=%p)",
                        static_cast<void *>(cursor));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->isSignalFrame();
 }
+_LIBUNWIND_WEAK_ALIAS(__unw_is_signal_frame, unw_is_signal_frame)
 
 #ifdef __arm__
 // Save VFP registers d0-d15 using FSTMIADX instead of FSTMIADD
-_LIBUNWIND_EXPORT void unw_save_vfp_as_X(unw_cursor_t *cursor) {
-  _LIBUNWIND_TRACE_API("unw_fpreg_save_vfp_as_X(cursor=%p)",
+_LIBUNWIND_HIDDEN void __unw_save_vfp_as_X(unw_cursor_t *cursor) {
+  _LIBUNWIND_TRACE_API("__unw_get_fpreg_save_vfp_as_X(cursor=%p)",
                        static_cast<void *>(cursor));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->saveVFPAsX();
 }
+_LIBUNWIND_WEAK_ALIAS(__unw_save_vfp_as_X, unw_save_cfp_as_X)
 #endif
 
 
 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 /// SPI: walks cached DWARF entries
-_LIBUNWIND_EXPORT void unw_iterate_dwarf_unwind_cache(void (*func)(
+_LIBUNWIND_HIDDEN void __unw_iterate_dwarf_unwind_cache(void (*func)(
     unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
-  _LIBUNWIND_TRACE_API("unw_iterate_dwarf_unwind_cache(func=%p)",
+  _LIBUNWIND_TRACE_API("__unw_iterate_dwarf_unwind_cache(func=%p)",
                        reinterpret_cast<void *>(func));
   DwarfFDECache<LocalAddressSpace>::iterateCacheEntries(func);
 }
-
+_LIBUNWIND_WEAK_ALIAS(__unw_iterate_dwarf_unwind_cache,
+                      unw_iterate_dwarf_unwind_cache)
 
 /// IPI: for __register_frame()
-void _unw_add_dynamic_fde(unw_word_t fde) {
+void __unw_add_dynamic_fde(unw_word_t fde) {
   CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
   CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
   const char *message = CFI_Parser<LocalAddressSpace>::decodeFDE(
@@ -264,12 +266,12 @@ void _unw_add_dynamic_fde(unw_word_t fde) {
                                           fdeInfo.pcStart, fdeInfo.pcEnd,
                                           fdeInfo.fdeStart);
   } else {
-    _LIBUNWIND_DEBUG_LOG("_unw_add_dynamic_fde: bad fde: %s", message);
+    _LIBUNWIND_DEBUG_LOG("__unw_add_dynamic_fde: bad fde: %s", message);
   }
 }
 
 /// IPI: for __deregister_frame()
-void _unw_remove_dynamic_fde(unw_word_t fde) {
+void __unw_remove_dynamic_fde(unw_word_t fde) {
   // fde is own mh_group
   DwarfFDECache<LocalAddressSpace>::removeAllIn((LocalAddressSpace::pint_t)fde);
 }
diff --git a/src/libunwind_ext.h b/src/libunwind_ext.h
index 01b58a9..316dee2 100644
--- a/src/libunwind_ext.h
+++ b/src/libunwind_ext.h
@@ -22,15 +22,34 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+
+extern int __unw_getcontext(unw_context_t *);
+extern int __unw_init_local(unw_cursor_t *, unw_context_t *);
+extern int __unw_step(unw_cursor_t *);
+extern int __unw_get_reg(unw_cursor_t *, unw_regnum_t, unw_word_t *);
+extern int __unw_get_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t *);
+extern int __unw_set_reg(unw_cursor_t *, unw_regnum_t, unw_word_t);
+extern int __unw_set_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t);
+extern int __unw_resume(unw_cursor_t *);
+
+#ifdef __arm__
+/* Save VFP registers in FSTMX format (instead of FSTMD). */
+extern void __unw_save_vfp_as_X(unw_cursor_t *);
+#endif
+
+extern const char *__unw_regname(unw_cursor_t *, unw_regnum_t);
+extern int __unw_get_proc_info(unw_cursor_t *, unw_proc_info_t *);
+extern int __unw_is_fpreg(unw_cursor_t *, unw_regnum_t);
+extern int __unw_is_signal_frame(unw_cursor_t *);
+extern int __unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *);
+
 // SPI
-extern void unw_iterate_dwarf_unwind_cache(void (*func)(unw_word_t ip_start,
-                                                        unw_word_t ip_end,
-                                                        unw_word_t fde,
-                                                        unw_word_t mh));
+extern void __unw_iterate_dwarf_unwind_cache(void (*func)(
+    unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh));
 
 // IPI
-extern void _unw_add_dynamic_fde(unw_word_t fde);
-extern void _unw_remove_dynamic_fde(unw_word_t fde);
+extern void __unw_add_dynamic_fde(unw_word_t fde);
+extern void __unw_remove_dynamic_fde(unw_word_t fde);
 
 #if defined(_LIBUNWIND_ARM_EHABI)
 extern const uint32_t* decode_eht_entry(const uint32_t*, size_t*, size_t*);