diff --git a/arch/arm/include/limits.h b/arch/arm/include/limits.h
index fc122a3ac0..c2033dd94c 100644
--- a/arch/arm/include/limits.h
+++ b/arch/arm/include/limits.h
@@ -74,7 +74,8 @@
 
 /* A pointer is 4 bytes */
 
-#define PTR_MIN     0x00000000
-#define PTR_MAX     0xffffffff
+#define PTR_MIN     0x80000000
+#define PTR_MAX     0x7fffffff
+#define UPTR_MAX    0xffffffff
 
 #endif /* __ARCH_ARM_INCLUDE_LIMITS_H */
diff --git a/arch/hc/include/hc12/limits.h b/arch/hc/include/hc12/limits.h
index 919ef1b289..ee6a48ca82 100755
--- a/arch/hc/include/hc12/limits.h
+++ b/arch/hc/include/hc12/limits.h
@@ -85,7 +85,8 @@
 
 /* A pointer is 2 bytes */
 
-#define PTR_MIN     0x0000
-#define PTR_MAX     0xffff
+#define PTR_MIN     0x8000
+#define PTR_MAX     0x7fff
+#define UPTR_MAX    0xffff
 
 #endif /* __ARCH_HC_INCLUDE_HC12_LIMITS_H */
diff --git a/arch/hc/include/hcs12/limits.h b/arch/hc/include/hcs12/limits.h
index 6fa85c4b49..eb950cfc5e 100755
--- a/arch/hc/include/hcs12/limits.h
+++ b/arch/hc/include/hcs12/limits.h
@@ -85,7 +85,8 @@
 
 /* A pointer is 2 bytes */
 
-#define PTR_MIN     0x0000
-#define PTR_MAX     0xffff
+#define PTR_MIN     0x8000
+#define PTR_MAX     0x7fff
+#define UPTR_MAX    0xffff
 
 #endif /* __ARCH_HC_INCLUDE_HCS12_LIMITS_H */
diff --git a/arch/pjrc-8051/include/limits.h b/arch/pjrc-8051/include/limits.h
index c6fa9af8a0..fa93f188c1 100644
--- a/arch/pjrc-8051/include/limits.h
+++ b/arch/pjrc-8051/include/limits.h
@@ -72,7 +72,8 @@
  * first byte holding data space information.
  */
 
-#define PTR_MIN     0x000000
-#define PTR_MAX     0xffffff
+#define PTR_MIN     0x800000
+#define PTR_MAX     0x7fffff
+#define UPTR_MAX    0xffffff
 
 #endif /* __ARCH_PJRC8051_INCLUDE_LIMITS_H  */
diff --git a/arch/sh/include/m16c/limits.h b/arch/sh/include/m16c/limits.h
index 61fca28825..589cb5be14 100644
--- a/arch/sh/include/m16c/limits.h
+++ b/arch/sh/include/m16c/limits.h
@@ -76,7 +76,8 @@
 
 /* A pointer is 2 bytes */
 
-#define PTR_MIN     0x0000
-#define PTR_MAX     0xffff
+#define PTR_MIN     0x8000
+#define PTR_MAX     0x7fff
+#define UPTR_MAX    0xffff
 
 #endif /* __ARCH_SH_INCLUDE_M16C_LIMITS_H */
diff --git a/arch/sh/include/sh1/limits.h b/arch/sh/include/sh1/limits.h
index 82d56a70d8..4bb3a8a4e4 100644
--- a/arch/sh/include/sh1/limits.h
+++ b/arch/sh/include/sh1/limits.h
@@ -76,7 +76,8 @@
 
 /* A pointer is 4 bytes */
 
-#define PTR_MIN     0x00000000
-#define PTR_MAX     0xffffffff
+#define PTR_MIN     0x80000000
+#define PTR_MAX     0x7fffffff
+#define UPTR_MAX    0xffffffff
 
 #endif /* __ARCH_SH_INCLUDE_SH1_LIMITS_H */
diff --git a/arch/sim/include/limits.h b/arch/sim/include/limits.h
index aef6efa458..814319c0a6 100644
--- a/arch/sim/include/limits.h
+++ b/arch/sim/include/limits.h
@@ -74,7 +74,8 @@
 
 /* A pointer is 4 bytes */
 
-#define PTR_MIN     0x00000000
-#define PTR_MAX     0xffffffff
+#define PTR_MIN     0x80000000
+#define PTR_MAX     0x7fffffff
+#define UPTR_MAX    0xffffffff
 
 #endif /* __ARCH_SIM_INCLUDE_LIMITS_H  */
diff --git a/arch/z16/include/limits.h b/arch/z16/include/limits.h
index 56ac65afa4..05c34fae40 100644
--- a/arch/z16/include/limits.h
+++ b/arch/z16/include/limits.h
@@ -72,7 +72,8 @@
 
 /* A pointer is 4 bytes */
 
-#define PTR_MIN     0x00000000
-#define PTR_MAX     0xffffffff
+#define PTR_MIN     0x80000000
+#define PTR_MAX     0x7fffffff
+#define UPTR_MAX    0xffffffff
 
 #endif /* __ARCH_Z16_INCLUDE_LIMITS_H  */
diff --git a/arch/z80/include/ez80/limits.h b/arch/z80/include/ez80/limits.h
index f50feaf084..b276dd399a 100755
--- a/arch/z80/include/ez80/limits.h
+++ b/arch/z80/include/ez80/limits.h
@@ -76,11 +76,13 @@
  */
 
 #ifdef CONFIG_EZ80_Z80MODE
-#define PTR_MIN     0x0000
-#define PTR_MAX     0xffff
+#define PTR_MIN     0x8000
+#define PTR_MAX     0x7fff
+#define UPTR_MAX    0xffff
 #else
-#define PTR_MIN     0x000000
-#define PTR_MAX     0xffffff
+#define PTR_MIN     0x800000
+#define PTR_MAX     0x7fffff
+#define UPTR_MAX    0xffffff
 #endif
 
 #endif /* __ARCH_Z80_INCLUDE_EZ80_LIMITS_H */
diff --git a/arch/z80/include/z8/limits.h b/arch/z80/include/z8/limits.h
index c5d7498a0c..9084b65efc 100755
--- a/arch/z80/include/z8/limits.h
+++ b/arch/z80/include/z8/limits.h
@@ -70,7 +70,8 @@
 
 /* A pointer is 2 bytes */
 
-#define PTR_MIN     0x0000
-#define PTR_MAX     0xffff
+#define PTR_MIN     0x8000
+#define PTR_MAX     0x7fff
+#define UPTR_MAX    0xffff
 
 #endif /* __ARCH_Z80_INCLUDE_Z8_LIMITS_H  */
diff --git a/arch/z80/include/z80/limits.h b/arch/z80/include/z80/limits.h
index 95ea0ab134..4e412e3d65 100755
--- a/arch/z80/include/z80/limits.h
+++ b/arch/z80/include/z80/limits.h
@@ -70,7 +70,8 @@
 
 /* A pointer is 2 bytes */
 
-#define PTR_MIN     0x0000
-#define PTR_MAX     0xffff
+#define PTR_MIN     0x8000
+#define PTR_MAX     0x7fff
+#define UPTR_MAX    0xffff
 
 #endif /* __ARCH_Z80_INCLUDE_Z80_LIMITS_H  */