ARM: pgtable: invert L_PTE_EXEC to L_PTE_XN

The hardware page tables use an XN bit 'execute never'.  Historically,
we've had a Linux 'execute allow' bit, in the positive sense.  Get rid
of this artifact as future hardware will continue to have the XN sense.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 22 insertions, 22 deletions

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 4701a6b758b7..f9b3f4bd7410 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -171,7 +171,7 @@ extern void __pgd_error(const char *file, int line, pgd_t);
 #define L_PTE_DIRTY             (_AT(pteval_t, 1) << 6)
 #define L_PTE_WRITE             (_AT(pteval_t, 1) << 7)
 #define L_PTE_USER              (_AT(pteval_t, 1) << 8)
-#define L_PTE_EXEC              (_AT(pteval_t, 1) << 9)
+#define L_PTE_XN                (_AT(pteval_t, 1) << 9)
 #define L_PTE_SHARED            (_AT(pteval_t, 1) << 10)        /* shared(v6), coherent(xsc3) */
 
 /*
@@ -205,23 +205,23 @@ extern pgprot_t		pgprot_kernel;
 
 #define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
 
-#define PAGE_NONE               pgprot_user
-#define PAGE_SHARED             _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE)
-#define PAGE_SHARED_EXEC        _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC)
-#define PAGE_COPY               _MOD_PROT(pgprot_user, L_PTE_USER)
-#define PAGE_COPY_EXEC          _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC)
-#define PAGE_READONLY           _MOD_PROT(pgprot_user, L_PTE_USER)
-#define PAGE_READONLY_EXEC      _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC)
-#define PAGE_KERNEL             pgprot_kernel
-#define PAGE_KERNEL_EXEC        _MOD_PROT(pgprot_kernel, L_PTE_EXEC)
-
-#define __PAGE_NONE             __pgprot(_L_PTE_DEFAULT)
-#define __PAGE_SHARED           __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE)
-#define __PAGE_SHARED_EXEC      __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC)
-#define __PAGE_COPY             __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
-#define __PAGE_COPY_EXEC        __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC)
-#define __PAGE_READONLY         __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
-#define __PAGE_READONLY_EXEC    __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC)
+#define PAGE_NONE               _MOD_PROT(pgprot_user, L_PTE_XN)
+#define PAGE_SHARED             _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE | L_PTE_XN)
+#define PAGE_SHARED_EXEC        _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE)
+#define PAGE_COPY               _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
+#define PAGE_COPY_EXEC          _MOD_PROT(pgprot_user, L_PTE_USER)
+#define PAGE_READONLY           _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
+#define PAGE_READONLY_EXEC      _MOD_PROT(pgprot_user, L_PTE_USER)
+#define PAGE_KERNEL             _MOD_PROT(pgprot_kernel, L_PTE_XN)
+#define PAGE_KERNEL_EXEC        pgprot_kernel
+
+#define __PAGE_NONE             __pgprot(_L_PTE_DEFAULT | L_PTE_XN)
+#define __PAGE_SHARED           __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE | L_PTE_XN)
+#define __PAGE_SHARED_EXEC      __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE)
+#define __PAGE_COPY             __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
+#define __PAGE_COPY_EXEC        __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
+#define __PAGE_READONLY         __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
+#define __PAGE_READONLY_EXEC    __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
 
 #define __pgprot_modify(prot,mask,bits)         \
         __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
@@ -234,14 +234,14 @@ extern pgprot_t		pgprot_kernel;
 
 #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
 #define pgprot_dmacoherent(prot) \
-        __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE)
+        __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN)
 #define __HAVE_PHYS_MEM_ACCESS_PROT
 struct file;
 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
                                      unsigned long size, pgprot_t vma_prot);
 #else
 #define pgprot_dmacoherent(prot) \
-        __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED)
+        __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN)
 #endif
 
 #endif /* __ASSEMBLY__ */
@@ -383,7 +383,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 #define pte_write(pte)          (pte_val(pte) & L_PTE_WRITE)
 #define pte_dirty(pte)          (pte_val(pte) & L_PTE_DIRTY)
 #define pte_young(pte)          (pte_val(pte) & L_PTE_YOUNG)
-#define pte_exec(pte)           (pte_val(pte) & L_PTE_EXEC)
+#define pte_exec(pte)           (!(pte_val(pte) & L_PTE_XN))
 #define pte_special(pte)        (0)
 
 #define pte_present_user(pte) \
@@ -404,7 +404,7 @@ static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-        const pteval_t mask = L_PTE_EXEC | L_PTE_WRITE | L_PTE_USER;
+        const pteval_t mask = L_PTE_XN | L_PTE_WRITE | L_PTE_USER;
         pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
         return pte;
 }