diff --git a/arch/sparc64/kernel/binfmt_elf32.c b/arch/sparc64/kernel/binfmt_elf32.c
index a1a12d2..8a2abcc 100644
--- a/arch/sparc64/kernel/binfmt_elf32.c
+++ b/arch/sparc64/kernel/binfmt_elf32.c
@@ -153,7 +153,9 @@
 #undef MODULE_DESCRIPTION
 #undef MODULE_AUTHOR
 
+#include <asm/a.out.h>
+
 #undef TASK_SIZE
-#define TASK_SIZE 0xf0000000
+#define TASK_SIZE STACK_TOP32
 
 #include "../../../fs/binfmt_elf.c"
diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index 61dffb9..9019b41 100644
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -30,6 +30,7 @@
 #include <asm/ipc.h>
 #include <asm/utrap.h>
 #include <asm/perfctr.h>
+#include <asm/a.out.h>
 
 /* #define DEBUG_UNIMP_SYSCALL */
 
@@ -130,7 +131,7 @@
 	}
 
 	if (test_thread_flag(TIF_32BIT))
-		task_size = 0xf0000000UL;
+		task_size = STACK_TOP32;
 	if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 		return -ENOMEM;
 
@@ -203,7 +204,7 @@
 {
 	struct vm_area_struct *vma;
 	struct mm_struct *mm = current->mm;
-	unsigned long task_size = 0xf0000000UL;
+	unsigned long task_size = STACK_TOP32;
 	unsigned long addr = addr0;
 	int do_color_align;
 
@@ -370,7 +371,7 @@
 		mm->unmap_area = arch_unmap_area;
 	} else {
 		/* We know it's 32-bit */
-		unsigned long task_size = 0xf0000000UL;
+		unsigned long task_size = STACK_TOP32;
 		unsigned long gap;
 
 		gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
@@ -388,7 +389,7 @@
 asmlinkage unsigned long sparc_brk(unsigned long brk)
 {
 	/* People could try to be nasty and use ta 0x6d in 32bit programs */
-	if (test_thread_flag(TIF_32BIT) && brk >= 0xf0000000UL)
+	if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 		return current->mm->brk;
 
 	if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
@@ -554,10 +555,10 @@
 	retval = -EINVAL;
 
 	if (test_thread_flag(TIF_32BIT)) {
-		if (len >= 0xf0000000UL)
+		if (len >= STACK_TOP32)
 			goto out_putf;
 
-		if ((flags & MAP_FIXED) && addr > 0xf0000000UL - len)
+		if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 			goto out_putf;
 	} else {
 		if (len >= VA_EXCLUDE_START)
diff --git a/arch/sparc64/kernel/sys_sparc32.c b/arch/sparc64/kernel/sys_sparc32.c
index 417727b..0e41df0 100644
--- a/arch/sparc64/kernel/sys_sparc32.c
+++ b/arch/sparc64/kernel/sys_sparc32.c
@@ -62,6 +62,7 @@
 #include <asm/fpumacro.h>
 #include <asm/semaphore.h>
 #include <asm/mmu_context.h>
+#include <asm/a.out.h>
 
 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
 {
@@ -1039,15 +1040,15 @@
 	unsigned long ret = -EINVAL;
 	unsigned long new_addr = __new_addr;
 
-	if (old_len > 0xf0000000UL || new_len > 0xf0000000UL)
+	if (old_len > STACK_TOP32 || new_len > STACK_TOP32)
 		goto out;
-	if (addr > 0xf0000000UL - old_len)
+	if (addr > STACK_TOP32 - old_len)
 		goto out;
 	down_write(&current->mm->mmap_sem);
 	if (flags & MREMAP_FIXED) {
-		if (new_addr > 0xf0000000UL - new_len)
+		if (new_addr > STACK_TOP32 - new_len)
 			goto out_sem;
-	} else if (addr > 0xf0000000UL - new_len) {
+	} else if (addr > STACK_TOP32 - new_len) {
 		unsigned long map_flags = 0;
 		struct file *file = NULL;
 
diff --git a/arch/sparc64/solaris/misc.c b/arch/sparc64/solaris/misc.c
index 3ab4677..5284996 100644
--- a/arch/sparc64/solaris/misc.c
+++ b/arch/sparc64/solaris/misc.c
@@ -90,7 +90,7 @@
 	len = PAGE_ALIGN(len);
 	if(!(flags & MAP_FIXED))
 		addr = 0;
-	else if (len > 0xf0000000UL || addr > 0xf0000000UL - len)
+	else if (len > STACK_TOP32 || addr > STACK_TOP32 - len)
 		goto out_putf;
 	ret_type = flags & _MAP_NEW;
 	flags &= ~_MAP_NEW;
@@ -102,7 +102,7 @@
 			 (unsigned long) prot, (unsigned long) flags, off);
 	up_write(&current->mm->mmap_sem);
 	if(!ret_type)
-		retval = ((retval < 0xf0000000) ? 0 : retval);
+		retval = ((retval < STACK_TOP32) ? 0 : retval);
 	                        
 out_putf:
 	if (file)
diff --git a/include/asm-sparc64/a.out.h b/include/asm-sparc64/a.out.h
index faac321..35cb5c9 100644
--- a/include/asm-sparc64/a.out.h
+++ b/include/asm-sparc64/a.out.h
@@ -95,9 +95,11 @@
 
 #ifdef __KERNEL__
 
+#define STACK_TOP32	((1UL << 32UL) - PAGE_SIZE)
+#define STACK_TOP64	(0x0000080000000000UL - (1UL << 32UL))
+
 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
-		   0xf0000000 : \
-		   (0x0000080000000000UL - (1UL << 32UL)))
+		   STACK_TOP32 : STACK_TOP64)
 
 #endif