diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 5c95d98af23..3a157bbf469 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -488,7 +488,7 @@
 @ cdecl __wgetmainargs(ptr ptr ptr long ptr) msvcrt.__wgetmainargs
 @ extern __winitenv msvcrt.__winitenv
 @ cdecl _abnormal_termination() msvcrt._abnormal_termination
-@ stub _abs64
+@ cdecl -ret64 _abs64(int64) msvcrt._abs64
 @ cdecl _access(str long) msvcrt._access
 @ cdecl _access_s(str long) msvcrt._access_s
 @ extern _acmdln msvcrt._acmdln
@@ -1049,9 +1049,9 @@
 @ cdecl _rmdir(str) msvcrt._rmdir
 @ cdecl _rmtmp() msvcrt._rmtmp
 @ cdecl _rotl(long long) msvcrt._rotl
-@ stub _rotl64
+@ cdecl -ret64 _rotl64(int64 long) msvcrt._rotl64
 @ cdecl _rotr(long long) msvcrt._rotr
-@ stub _rotr64
+@ cdecl -ret64 _rotr64(int64 long) msvcrt._rotr64
 @ cdecl _scalb(double long) msvcrt._scalb
 @ varargs _scanf_l(str ptr) msvcrt._scanf_l
 @ varargs _scanf_s_l(str ptr) msvcrt._scanf_s_l
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index bfa87e39a09..dc20b563209 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -312,7 +312,7 @@
 @ cdecl __wgetmainargs(ptr ptr ptr long ptr) msvcrt.__wgetmainargs
 @ extern __winitenv msvcrt.__winitenv
 @ cdecl _abnormal_termination() msvcrt._abnormal_termination
-@ stub _abs64
+@ cdecl -ret64 _abs64(int64) msvcrt._abs64
 @ cdecl _access(str long) msvcrt._access
 @ cdecl _access_s(str long) msvcrt._access_s
 @ extern _acmdln msvcrt._acmdln
@@ -897,9 +897,9 @@
 @ cdecl _rmdir(str) msvcrt._rmdir
 @ cdecl _rmtmp() msvcrt._rmtmp
 @ cdecl _rotl(long long) msvcrt._rotl
-@ stub _rotl64
+@ cdecl -ret64 _rotl64(int64 long) msvcrt._rotl64
 @ cdecl _rotr(long long) msvcrt._rotr
-@ stub _rotr64
+@ cdecl -ret64 _rotr64(int64 long) msvcrt._rotr64
 @ cdecl -arch=i386 _safe_fdiv() msvcrt._safe_fdiv
 @ cdecl -arch=i386 _safe_fdivr() msvcrt._safe_fdivr
 @ cdecl -arch=i386 _safe_fprem() msvcrt._safe_fprem
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index b84e586e918..5e44d50962b 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -304,7 +304,7 @@
 @ cdecl __wgetmainargs(ptr ptr ptr long ptr) msvcrt.__wgetmainargs
 @ extern __winitenv msvcrt.__winitenv
 @ cdecl _abnormal_termination() msvcrt._abnormal_termination
-@ stub _abs64
+@ cdecl -ret64 _abs64(int64) msvcrt._abs64
 @ cdecl _access(str long) msvcrt._access
 @ cdecl _access_s(str long) msvcrt._access_s
 @ extern _acmdln msvcrt._acmdln
@@ -883,9 +883,9 @@
 @ cdecl _rmdir(str) msvcrt._rmdir
 @ cdecl _rmtmp() msvcrt._rmtmp
 @ cdecl _rotl(long long) msvcrt._rotl
-@ stub _rotl64
+@ cdecl -ret64 _rotl64(int64 long) msvcrt._rotl64
 @ cdecl _rotr(long long) msvcrt._rotr
-@ stub _rotr64
+@ cdecl -ret64 _rotr64(int64 long) msvcrt._rotr64
 @ cdecl -arch=i386 _safe_fdiv() msvcrt._safe_fdiv
 @ cdecl -arch=i386 _safe_fdivr() msvcrt._safe_fdivr
 @ cdecl -arch=i386 _safe_fprem() msvcrt._safe_fprem
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 34283980ae0..9659f178f32 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -639,15 +639,6 @@ unsigned int CDECL _rotl(unsigned int num, int shift)
   return (num << shift) | (num >> (32-shift));
 }
 
-/*********************************************************************
- *		_logb (MSVCRT.@)
- */
-double CDECL _logb(double num)
-{
-  if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
-  return logb(num);
-}
-
 /*********************************************************************
  *		_lrotl (MSVCRT.@)
  */
@@ -675,6 +666,57 @@ unsigned int CDECL _rotr(unsigned int num, int shift)
     return (num >> shift) | (num << (32-shift));
 }
 
+/*********************************************************************
+ *		_rotl64 (MSVCRT.@)
+ */
+unsigned __int64 CDECL _rotl64(unsigned __int64 num, int shift)
+{
+  shift &= 63;
+  return (num << shift) | (num >> (64-shift));
+}
+
+/*********************************************************************
+ *		_rotr64 (MSVCRT.@)
+ */
+unsigned __int64 CDECL _rotr64(unsigned __int64 num, int shift)
+{
+    shift &= 63;
+    return (num >> shift) | (num << (64-shift));
+}
+
+/*********************************************************************
+ *		abs (MSVCRT.@)
+ */
+int CDECL MSVCRT_abs( int n )
+{
+    return n >= 0 ? n : -n;
+}
+
+/*********************************************************************
+ *		labs (MSVCRT.@)
+ */
+MSVCRT_long CDECL MSVCRT_labs( MSVCRT_long n )
+{
+    return n >= 0 ? n : -n;
+}
+
+/*********************************************************************
+ *		_abs64 (MSVCRT.@)
+ */
+__int64 CDECL _abs64( __int64 n )
+{
+    return n >= 0 ? n : -n;
+}
+
+/*********************************************************************
+ *		_logb (MSVCRT.@)
+ */
+double CDECL _logb(double num)
+{
+  if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
+  return logb(num);
+}
+
 /*********************************************************************
  *		_scalb (MSVCRT.@)
  */
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 7687f5c881a..104687bc8f7 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -269,7 +269,7 @@
 @ cdecl __wgetmainargs(ptr ptr ptr long ptr)
 @ extern __winitenv MSVCRT___winitenv
 @ cdecl _abnormal_termination()
-# stub _abs64
+@ cdecl -ret64 _abs64(int64)
 @ cdecl _access(str long) MSVCRT__access
 @ cdecl _access_s(str long)
 @ extern _acmdln MSVCRT__acmdln
@@ -840,9 +840,9 @@
 @ cdecl _rmdir(str) MSVCRT__rmdir
 @ cdecl _rmtmp()
 @ cdecl _rotl(long long)
-# stub _rotl64
+@ cdecl -ret64 _rotl64(int64 long)
 @ cdecl _rotr(long long)
-# stub _rotr64
+@ cdecl -ret64 _rotr64(int64 long)
 @ cdecl -arch=i386 _safe_fdiv()
 @ cdecl -arch=i386 _safe_fdivr()
 @ cdecl -arch=i386 _safe_fprem()
@@ -1210,7 +1210,7 @@
 @ cdecl _y1(double)
 @ cdecl _yn(long double )
 @ cdecl abort() MSVCRT_abort
-@ cdecl abs(long) ntdll.abs
+@ cdecl abs(long) MSVCRT_abs
 @ cdecl acos(double) MSVCRT_acos
 @ cdecl -arch=x86_64 acosf(float) MSVCRT_acosf
 @ cdecl asctime(ptr) MSVCRT_asctime
@@ -1316,7 +1316,7 @@
 @ cdecl iswupper(long) MSVCRT_iswupper
 @ cdecl iswxdigit(long) MSVCRT_iswxdigit
 @ cdecl isxdigit(long) MSVCRT_isxdigit
-@ cdecl labs(long) ntdll.labs
+@ cdecl labs(long) MSVCRT_labs
 @ cdecl ldexp( double long) MSVCRT_ldexp
 @ cdecl ldiv(long long) MSVCRT_ldiv
 @ cdecl localeconv() MSVCRT_localeconv