diff --git a/dll/win32/ucrtbase/ucrtbase.spec b/dll/win32/ucrtbase/ucrtbase.spec
index c137b8080bc..e56735016dc 100644
--- a/dll/win32/ucrtbase/ucrtbase.spec
+++ b/dll/win32/ucrtbase/ucrtbase.spec
@@ -17,7 +17,7 @@
 @ cdecl -stub _Cbuild(ptr double double)
 @ stub _Cmulcc
 @ stub _Cmulcr
-@ cdecl -stub _CreateFrameInfo(ptr ptr)
+@ cdecl _CreateFrameInfo(ptr ptr)
 @ cdecl -dbg _CrtCheckMemory()
 @ cdecl -dbg _CrtDbgReport(long str long str str)
 @ cdecl -dbg _CrtDbgReportW(long wstr long wstr wstr)
@@ -46,19 +46,19 @@
 @ cdecl -dbg _CrtSetReportHook2() # FIXME: params
 @ cdecl -dbg _CrtSetReportHookW2() # FIXME: params
 @ cdecl -dbg _CrtSetReportMode() # FIXME: params
-@ stdcall -stub _CxxThrowException(ptr ptr)
+@ stdcall _CxxThrowException(ptr ptr)
 @ cdecl -arch=i386 -norelay _EH_prolog()
 @ cdecl _Exit(long)
 @ stub _FCbuild
 @ stub _FCmulcc
 @ stub _FCmulcr
-@ cdecl -stub _FindAndUnlinkFrame(ptr)
+@ cdecl _FindAndUnlinkFrame(ptr)
 @ stub _GetImageBase
 @ stub _GetThrowImageBase
 @ cdecl _Getdays()
 @ cdecl _Getmonths()
 @ cdecl _Gettnames()
-@ cdecl -stub _IsExceptionObjectToBeDestroyed(ptr)
+@ cdecl _IsExceptionObjectToBeDestroyed(ptr)
 @ stub _LCbuild
 @ stub _LCmulcc
 @ stub _LCmulcr
@@ -75,29 +75,29 @@
 @ cdecl _W_Getmonths()
 @ cdecl _W_Gettnames()
 @ cdecl _Wcsftime(ptr long wstr ptr ptr)
-@ cdecl -stub __AdjustPointer(ptr ptr)
+@ cdecl __AdjustPointer(ptr ptr)
 @ stub __BuildCatchObject
 @ stub __BuildCatchObjectHelper
 @ cdecl -arch=!i386 __C_specific_handler(ptr long ptr ptr) ntdll.__C_specific_handler
 @ cdecl -stub -arch=!i386 __C_specific_handler_noexcept(ptr long ptr ptr)
-@ cdecl -stub __CxxDetectRethrow(ptr)
-@ cdecl -stub __CxxExceptionFilter(ptr ptr long ptr)
-@ cdecl -stub -norelay __CxxFrameHandler(ptr ptr ptr ptr)
-@ cdecl -stub -norelay __CxxFrameHandler2(ptr ptr ptr ptr) __CxxFrameHandler
-@ cdecl -stub -norelay __CxxFrameHandler3(ptr ptr ptr ptr) __CxxFrameHandler
+@ cdecl __CxxDetectRethrow(ptr)
+@ cdecl __CxxExceptionFilter(ptr ptr long ptr)
+@ cdecl -norelay __CxxFrameHandler(ptr ptr ptr ptr)
+@ cdecl -norelay __CxxFrameHandler2(ptr ptr ptr ptr) __CxxFrameHandler
+@ cdecl -norelay __CxxFrameHandler3(ptr ptr ptr ptr) __CxxFrameHandler
 @ cdecl -stub -arch=x86_64 __CxxFrameHandler4(ptr long ptr ptr)
-@ stdcall -stub -arch=i386 __CxxLongjmpUnwind(ptr)
-@ cdecl -stub __CxxQueryExceptionSize()
-@ cdecl -stub __CxxRegisterExceptionObject(ptr ptr)
-@ cdecl -stub __CxxUnregisterExceptionObject(ptr long)
-@ cdecl -stub __DestructExceptionObject(ptr)
+@ stdcall -arch=i386 __CxxLongjmpUnwind(ptr)
+@ cdecl __CxxQueryExceptionSize()
+@ cdecl __CxxRegisterExceptionObject(ptr ptr)
+@ cdecl __CxxUnregisterExceptionObject(ptr long)
+@ cdecl __DestructExceptionObject(ptr)
 @ stub __FrameUnwindFilter
 @ stub __GetPlatformExceptionInfo
 @ stub __NLG_Dispatch2
 @ stub __NLG_Return2
-@ cdecl -stub __RTCastToVoid(ptr)
-@ cdecl -stub __RTDynamicCast(ptr long ptr ptr long)
-@ cdecl -stub __RTtypeid(ptr)
+@ cdecl __RTCastToVoid(ptr)
+@ cdecl __RTDynamicCast(ptr long ptr ptr long)
+@ cdecl __RTtypeid(ptr)
 @ stub __TypeMatch
 @ cdecl ___lc_codepage_func()
 @ cdecl ___lc_collate_cp_func()
@@ -114,8 +114,8 @@
 @ cdecl __conio_common_vcwprintf_s(int64 wstr ptr ptr)
 @ cdecl __conio_common_vcwscanf(int64 wstr ptr ptr)
 @ cdecl -stub -arch=i386 __control87_2(long long ptr ptr)
-@ cdecl -stub __current_exception()
-@ cdecl -stub __current_exception_context()
+@ cdecl __current_exception()
+@ cdecl __current_exception_context()
 @ cdecl __daylight()
 @ cdecl __dcrt_get_wide_environment_from_os() # FIXME: params
 @ cdecl __dcrt_initial_narrow_environment()
@@ -170,18 +170,18 @@
 @ cdecl __p__wenviron()
 @ cdecl __p__wpgmptr()
 @ cdecl __pctype_func()
-@ cdecl -stub __processing_throw()
+@ cdecl __processing_throw()
 @ cdecl __pwctype_func()
 @ cdecl __pxcptinfoptrs()
 @ cdecl __report_gsfailure()
 @ cdecl __setusermatherr(ptr)
-@ cdecl -stub __std_exception_copy(ptr ptr)
-@ cdecl -stub __std_exception_destroy(ptr)
+@ cdecl __std_exception_copy(ptr ptr)
+@ cdecl __std_exception_destroy(ptr)
 @ cdecl __std_terminate() terminate
-@ cdecl -stub __std_type_info_compare(ptr ptr)
-@ cdecl -stub __std_type_info_destroy_list(ptr)
-@ cdecl -stub __std_type_info_hash(ptr)
-@ cdecl -stub __std_type_info_name(ptr ptr)
+@ cdecl __std_type_info_compare(ptr ptr)
+@ cdecl __std_type_info_destroy_list(ptr)
+@ cdecl __std_type_info_hash(ptr)
+@ cdecl __std_type_info_name(ptr ptr)
 @ cdecl __stdio_common_vfprintf(int64 ptr str ptr ptr)
 @ cdecl __stdio_common_vfprintf_p(int64 ptr str ptr ptr)
 @ cdecl __stdio_common_vfprintf_s(int64 ptr str ptr ptr)
@@ -210,7 +210,7 @@
 @ cdecl __tzname()
 @ cdecl __unDName(ptr str long ptr ptr long)
 @ cdecl __unDNameEx(ptr str long ptr ptr ptr long)
-@ cdecl -stub __uncaught_exception()
+@ cdecl __uncaught_exception()
 @ cdecl -stub __uncaught_exceptions()
 @ cdecl __wcserror(wstr)
 @ cdecl __wcserror_s(ptr long wstr)
@@ -267,7 +267,7 @@
 @ cdecl _chdrive(long)
 @ cdecl _chgsign(double)
 @ cdecl _chgsignf(float)
-@ cdecl -stub -arch=i386 -norelay _chkesp()
+@ cdecl -arch=i386 -norelay _chkesp()
 @ cdecl _chmod(str long)
 @ cdecl _chsize(long long)
 @ cdecl _chsize_s(long int64)
@@ -323,7 +323,7 @@
 @ cdecl -stub _except1(long long double double long ptr)
 @ cdecl -arch=i386 _except_handler2(ptr ptr ptr ptr)
 @ cdecl -arch=i386 _except_handler3(ptr ptr ptr ptr)
-@ cdecl -stub -arch=i386 _except_handler4_common(ptr ptr ptr ptr ptr ptr)
+@ cdecl -arch=i386 _except_handler4_common(ptr ptr ptr ptr ptr ptr)
 @ varargs _execl(str str)
 @ varargs _execle(str str)
 @ varargs _execlp(str str)
@@ -375,7 +375,7 @@
 @ cdecl _flushall()
 @ cdecl _fpclass(double)
 @ cdecl -stub -arch=!i386 _fpclassf(float)
-@ cdecl -stub _fpieee_flt(long ptr ptr)
+@ cdecl _fpieee_flt(long ptr ptr)
 @ cdecl -stub _fpreset()
 @ cdecl _fputc_nolock(long ptr)
 @ cdecl _fputchar(long)
@@ -430,7 +430,7 @@
 @ cdecl _get_thread_local_invalid_parameter_handler()
 @ cdecl _get_timezone(ptr)
 @ cdecl _get_tzname(ptr str long long)
-@ cdecl -stub _get_unexpected()
+@ cdecl _get_unexpected()
 @ cdecl _get_wide_winmain_command_line()
 @ cdecl _get_wpgmptr(ptr)
 @ cdecl _getc_nolock(ptr) _fgetc_nolock
@@ -481,7 +481,7 @@
 @ cdecl _invalid_parameter_noinfo()
 @ cdecl _invalid_parameter_noinfo_noreturn()
 @ cdecl _invoke_watson(wstr wstr wstr long long)
-@ stub _is_exception_typeof
+@ cdecl _is_exception_typeof(ptr ptr)
 @ cdecl _isalnum_l(long ptr)
 @ cdecl _isalpha_l(long ptr)
 @ cdecl _isatty(long)
@@ -612,7 +612,7 @@
 @ cdecl _loaddll(str)
 @ cdecl -arch=win64 _local_unwind(ptr ptr) ntdll._local_unwind
 @ cdecl -arch=i386 _local_unwind2(ptr long)
-@ cdecl -stub -arch=i386 _local_unwind4(ptr ptr long)
+@ cdecl -arch=i386 _local_unwind4(ptr ptr long)
 @ cdecl _localtime32(ptr)
 @ cdecl _localtime32_s(ptr ptr)
 @ cdecl _localtime64(ptr)
@@ -1902,7 +1902,7 @@
 @ cdecl _pclose(ptr)
 @ cdecl _pipe(ptr long long)
 @ cdecl _popen(str str)
-@ cdecl -stub _purecall()
+@ cdecl _purecall()
 @ cdecl _putc_nolock(long ptr) _fputc_nolock
 @ cdecl _putch(long)
 @ cdecl _putch_nolock(long)
@@ -1937,8 +1937,8 @@
 @ cdecl _seh_filter_dll(long ptr) # __CppXcptFilter
 @ cdecl _seh_filter_exe(long ptr) # _XcptFilter
 @ cdecl -arch=win64 _set_FMA3_enable(long)
-@ stdcall -stub -arch=i386 _seh_longjmp_unwind4(ptr)
-@ stdcall -stub -arch=i386 _seh_longjmp_unwind(ptr)
+@ stdcall -arch=i386 _seh_longjmp_unwind4(ptr)
+@ stdcall -arch=i386 _seh_longjmp_unwind(ptr)
 @ cdecl -stub -arch=i386 _set_SSE2_enable(long)
 @ cdecl _set_abort_behavior(long long)
 @ cdecl _set_app_type(long)
@@ -1951,8 +1951,8 @@
 @ cdecl _set_new_handler(ptr)
 @ cdecl _set_new_mode(long)
 @ cdecl _set_printf_count_output(long)
-@ cdecl -stub _set_purecall_handler(ptr)
-@ cdecl -stub _set_se_translator(ptr)
+@ cdecl _set_purecall_handler(ptr)
+@ cdecl _set_se_translator(ptr)
 @ cdecl _set_thread_local_invalid_parameter_handler(ptr)
 @ cdecl _seterrormode(long)
 @ cdecl -arch=i386 -norelay _setjmp3(ptr long)
@@ -2549,7 +2549,7 @@
 @ cdecl -stub scalbnf(float long) # float scalbnf(float x, int exp);
 @ cdecl scalbnl(double long) scalbn # long double scalbnl(long double x, int exp);
 @ cdecl set_terminate(ptr)
-@ cdecl -stub set_unexpected(ptr)
+@ cdecl set_unexpected(ptr)
 @ cdecl setbuf(ptr ptr)
 @ cdecl -arch=arm,x86_64 -norelay -private setjmp(ptr ptr) _setjmp
 @ cdecl setlocale(long str)
diff --git a/sdk/lib/crt/misc/tls.c b/sdk/lib/crt/misc/tls.c
index da5f918d22a..568bd17be65 100644
--- a/sdk/lib/crt/misc/tls.c
+++ b/sdk/lib/crt/misc/tls.c
@@ -41,8 +41,10 @@ thread_data_t *msvcrt_get_thread_data(void)
         ptr->tid = GetCurrentThreadId();
         ptr->handle = INVALID_HANDLE_VALUE;
         ptr->random_seed = 1;
+#ifndef __UCRTSUPPORT__
         ptr->locinfo = MSVCRT_locale->locinfo;
         ptr->mbcinfo = MSVCRT_locale->mbcinfo;
+#endif /* !__UCRTSUPPORT__ */
     }
     SetLastError( err );
     return ptr;
diff --git a/sdk/lib/crt/ucrtsupport.cmake b/sdk/lib/crt/ucrtsupport.cmake
index 18216a5483f..2f558d96db5 100644
--- a/sdk/lib/crt/ucrtsupport.cmake
+++ b/sdk/lib/crt/ucrtsupport.cmake
@@ -2,21 +2,67 @@
 list(APPEND UCRTSUPP_SOURCE
     ${CRT_FLOAT_SOURCE}
     ${CRT_MATH_SOURCE}
+    misc/amsg.c
+    misc/purecall.c
+    misc/tls.c
+    wine/cpp.c
+    wine/except.c
     wine/undname.c
 )
 
 list(APPEND UCRTSUPP_ASM_SOURCE
-    ${CRT_EXCEPT_ASM_SOURCE}
     ${CRT_FLOAT_ASM_SOURCE}
     ${CRT_MATH_ASM_SOURCE}
     ${CRT_SETJMP_ASM_SOURCE}
+    ${CRT_WINE_ASM_SOURCE}
 )
 
+if(ARCH STREQUAL "i386")
+    list(APPEND UCRTSUPP_SOURCE
+        except/i386/CxxHandleV8Frame.c
+        wine/except_i386.c
+    )
+    list(APPEND UCRTSUPP_ASM_SOURCE
+        except/i386/__CxxFrameHandler3.s
+        except/i386/chkesp.s
+        wine/rosglue_i386.s
+    )
+    if(MSVC)
+        list(APPEND UCRTSUPP_ASM_SOURCE
+            except/i386/cpp.s
+            except/i386/prolog.s
+        )
+    endif()
+elseif(ARCH STREQUAL "amd64")
+    list(APPEND UCRTSUPP_SOURCE
+        wine/except_x86_64.c
+    )
+    if(MSVC)
+        list(APPEND UCRTSUPP_ASM_SOURCE
+            except/amd64/cpp.s
+        )
+    endif()
+elseif(ARCH STREQUAL "arm")
+    list(APPEND UCRTSUPP_SOURCE
+        wine/except_arm.c
+    )
+    if(MSVC)
+        list(APPEND UCRTSUPP_ASM_SOURCE
+            except/arm/cpp.s
+        )
+    endif()
+elseif(ARCH STREQUAL "arm64")
+    list(APPEND UCRTSUPP_SOURCE
+        wine/except_arm64.c
+    )
+endif()
+
 add_asm_files(ucrtsupp_asm ${UCRTSUPP_ASM_SOURCE})
 
 add_library(ucrtsupport ${UCRTSUPP_SOURCE} ${ucrtsupp_asm})
 target_link_libraries(ucrtsupport chkstk ${PSEH_LIB})
 target_compile_definitions(ucrtsupport PRIVATE
+    __UCRTSUPPORT__
     CRTDLL
     _MSVCRT_LIB_
     _MSVCRT_
@@ -24,6 +70,11 @@ target_compile_definitions(ucrtsupport PRIVATE
     USE_MSVCRT_PREFIX
     __MINGW_IMPORT=extern
     __fma3_lib_init=__acrt_initialize_fma3
+    set_terminate=_wine_set_terminate
+    terminate=_wine_terminate
+    _get_terminate=_wine_get_terminate
+    unexpected=_wine_unexpected
+    __pxcptinfoptrs=_wine__pxcptinfoptrs
 )
 #add_pch(crt precomp.h)
 add_dependencies(ucrtsupport psdk asm)
diff --git a/sdk/lib/crt/wine/cpp.c b/sdk/lib/crt/wine/cpp.c
index a256569584b..d7cc32aefc7 100644
--- a/sdk/lib/crt/wine/cpp.c
+++ b/sdk/lib/crt/wine/cpp.c
@@ -1025,7 +1025,7 @@ void WINAPI _CxxThrowException( void *object, const cxx_exception_type *type )
 }
 #endif
 
-#if _MSVCR_VER >= 80
+#if _MSVCR_VER >= 80 || defined(__UCRTSUPPORT__)
 
 /*********************************************************************
  * ?_is_exception_typeof@@YAHABVtype_info@@PAU_EXCEPTION_POINTERS@@@Z
@@ -1063,6 +1063,8 @@ int __cdecl _is_exception_typeof(const type_info *ti, EXCEPTION_POINTERS *ep)
         }
     }
     __EXCEPT_PAGE_FAULT
+    {
+    }
     __ENDTRY
 
     if(ret == -1)
@@ -1104,6 +1106,8 @@ int __cdecl _is_exception_typeof(const type_info *ti, EXCEPTION_POINTERS *ep)
         }
     }
     __EXCEPT_PAGE_FAULT
+    {
+    }
     __ENDTRY
 
     if(ret == -1)
@@ -1123,6 +1127,7 @@ void CDECL __clean_type_info_names_internal(void *p)
 /*********************************************************************
  * ?_name_internal_method@type_info@@QBEPBDPAU__type_info_node@@@Z (MSVCR100.@)
  */
+const char * __thiscall type_info_name_internal_method(type_info * _this, struct __type_info_node *node);
 DEFINE_THISCALL_WRAPPER(type_info_name_internal_method,8)
 const char * __thiscall type_info_name_internal_method(type_info * _this, struct __type_info_node *node)
 {
@@ -1472,14 +1477,14 @@ bool __cdecl __ExceptionPtrCompare(const exception_ptr *ep1, const exception_ptr
 
 #endif /* _MSVCR_VER >= 100 */
 
-#if _MSVCR_VER >= 80
+#if _MSVCR_VER >= 80 || defined(__UCRTSUPPORT__)
 void* __cdecl __AdjustPointer(void *obj, const this_ptr_offsets *off)
 {
     return get_this_pointer(off, obj);
 }
 #endif
 
-#if _MSVCR_VER >= 140
+#if _MSVCR_VER >= 140 || defined(__UCRTSUPPORT__)
 
 typedef struct
 {
diff --git a/sdk/lib/crt/wine/except.c b/sdk/lib/crt/wine/except.c
index 4679560dae5..8750379225b 100644
--- a/sdk/lib/crt/wine/except.c
+++ b/sdk/lib/crt/wine/except.c
@@ -487,7 +487,7 @@ struct __std_exception_data {
     char dofree;
 };
 
-#if _MSVCR_VER>=140
+#if _MSVCR_VER>=140 || defined(__UCRTSUPPORT__)
 
 /*********************************************************************
  *  __std_exception_copy (UCRTBASE.@)