1 files changed, 42 insertions, 14 deletions

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index cbfb2edcf7d1..23b0b03af5ea 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -413,7 +413,16 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
         pmd_k = pmd_offset(pgd_k, addr);
         pmd   = pmd_offset(pgd, addr);
 
-        if (pmd_none(*pmd_k))
+        /*
+         * On ARM one Linux PGD entry contains two hardware entries (see page
+         * tables layout in pgtable.h). We normally guarantee that we always
+         * fill both L1 entries. But create_mapping() doesn't follow the rule.
+         * It can create inidividual L1 entries, so here we have to call
+         * pmd_none() check for the entry really corresponded to address, not
+         * for the first of pair.
+         */
+        index = (addr >> SECTION_SHIFT) & 1;
+        if (pmd_none(pmd_k[index]))
                 goto bad_area;
 
         copy_pmd(pmd, pmd_k);
@@ -463,15 +472,10 @@ static struct fsr_info {
          * defines these to be "precise" aborts.
          */
         { do_bad,               SIGSEGV, 0,             "vector exception"                 },
-        { do_bad,               SIGILL,  BUS_ADRALN,    "alignment exception"              },
+        { do_bad,               SIGBUS,  BUS_ADRALN,    "alignment exception"              },
         { do_bad,               SIGKILL, 0,             "terminal exception"               },
-        { do_bad,               SIGILL,  BUS_ADRALN,    "alignment exception"              },
-/* Do we need runtime check ? */
-#if __LINUX_ARM_ARCH__ < 6
+        { do_bad,               SIGBUS,  BUS_ADRALN,    "alignment exception"              },
         { do_bad,               SIGBUS,  0,             "external abort on linefetch"      },
-#else
-        { do_translation_fault, SIGSEGV, SEGV_MAPERR,   "I-cache maintenance fault"        },
-#endif
         { do_translation_fault, SIGSEGV, SEGV_MAPERR,   "section translation fault"        },
         { do_bad,               SIGBUS,  0,             "external abort on linefetch"      },
         { do_page_fault,        SIGSEGV, SEGV_MAPERR,   "page translation fault"           },
@@ -508,13 +512,15 @@ static struct fsr_info {
 
 void __init
 hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
-                int sig, const char *name)
+                int sig, int code, const char *name)
 {
-        if (nr >= 0 && nr < ARRAY_SIZE(fsr_info)) {
-                fsr_info[nr].fn   = fn;
-                fsr_info[nr].sig  = sig;
-                fsr_info[nr].name = name;
-        }
+        if (nr < 0 || nr >= ARRAY_SIZE(fsr_info))
+                BUG();
+
+        fsr_info[nr].fn   = fn;
+        fsr_info[nr].sig  = sig;
+        fsr_info[nr].code = code;
+        fsr_info[nr].name = name;
 }
 
 /*
@@ -594,3 +600,25 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
         arm_notify_die("", regs, &info, ifsr, 0);
 }
 
+static int __init exceptions_init(void)
+{
+        if (cpu_architecture() >= CPU_ARCH_ARMv6) {
+                hook_fault_code(4, do_translation_fault, SIGSEGV, SEGV_MAPERR,
+                                "I-cache maintenance fault");
+        }
+
+        if (cpu_architecture() >= CPU_ARCH_ARMv7) {
+                /*
+                 * TODO: Access flag faults introduced in ARMv6K.
+                 * Runtime check for 'K' extension is needed
+                 */
+                hook_fault_code(3, do_bad, SIGSEGV, SEGV_MAPERR,
+                                "section access flag fault");
+                hook_fault_code(6, do_bad, SIGSEGV, SEGV_MAPERR,
+                                "section access flag fault");
+        }
+
+        return 0;
+}
+
+arch_initcall(exceptions_init);