X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fs390%2Fmm%2Ffault.c;h=9cf3b392ebf55bf761cf4f48010e29954e582cd5;hb=f9296eb00ed30209424102d3c920e69617eea853;hp=8b2dda88330799fd4eecca2e9b0f763458c36b36;hpb=a91482bdcc2e0f6035702e46f1b99043a0893346;p=linux-2.6.git

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 8b2dda883..9cf3b392e 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -159,8 +159,7 @@ static void force_sigsegv(struct pt_regs *regs, unsigned long error_code,
  *   11       Page translation     ->  Not present       (nullification)
  *   3b       Region third trans.  ->  Not present       (nullification)
  */
-extern inline void
-do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
+extern inline void do_exception(struct pt_regs *regs, unsigned long error_code)
 {
         struct task_struct *tsk;
         struct mm_struct *mm;
@@ -178,7 +177,7 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
 	 * as a special case because the translation exception code 
 	 * field is not guaranteed to contain valid data in this case.
 	 */
-	if (is_protection && !(S390_lowcore.trans_exc_code & 4)) {
+	if (error_code == 4 && !(S390_lowcore.trans_exc_code & 4)) {
 
 		/* Low-address protection hit in kernel mode means 
 		   NULL pointer write access in kernel mode.  */
@@ -233,7 +232,7 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
  */
 good_area:
 	si_code = SEGV_ACCERR;
-	if (!is_protection) {
+	if (error_code != 4) {
 		/* page not present, check vm flags */
 		if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
 			goto bad_area;
@@ -248,7 +247,7 @@ survive:
 	 * make sure we exit gracefully rather than endlessly redo
 	 * the fault.
 	 */
-	switch (handle_mm_fault(mm, vma, address, is_protection)) {
+	switch (handle_mm_fault(mm, vma, address, error_code == 4)) {
 	case VM_FAULT_MINOR:
 		tsk->min_flt++;
 		break;
@@ -264,11 +263,6 @@ survive:
 	}
 
         up_read(&mm->mmap_sem);
-	/*
-	 * The instruction that caused the program check will
-	 * be repeated. Don't signal single step via SIGTRAP.
-	 */
-	clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
         return;
 
 /*
@@ -343,15 +337,28 @@ do_sigbus:
 void do_protection_exception(struct pt_regs *regs, unsigned long error_code)
 {
 	regs->psw.addr -= (error_code >> 16);
-	do_exception(regs, 4, 1);
+	do_exception(regs, 4);
 }
 
-void do_dat_exception(struct pt_regs *regs, unsigned long error_code)
+void do_segment_exception(struct pt_regs *regs, unsigned long error_code)
 {
-	do_exception(regs, error_code & 0xff, 0);
+	do_exception(regs, 0x10);
 }
 
-#ifndef CONFIG_ARCH_S390X
+void do_page_exception(struct pt_regs *regs, unsigned long error_code)
+{
+	do_exception(regs, 0x11);
+}
+
+#ifdef CONFIG_ARCH_S390X
+
+void
+do_region_exception(struct pt_regs *regs, unsigned long error_code)
+{
+	do_exception(regs, 0x3b);
+}
+
+#else /* CONFIG_ARCH_S390X */
 
 typedef struct _pseudo_wait_t {
        struct _pseudo_wait_t *next;
@@ -449,11 +456,6 @@ do_pseudo_page_fault(struct pt_regs *regs, unsigned long error_code)
                 wait_struct.next = pseudo_lock_queue;
                 pseudo_lock_queue = &wait_struct;
                 spin_unlock(&pseudo_wait_spinlock);
-		/*
-		 * The instruction that caused the program check will
-		 * be repeated. Don't signal single step via SIGTRAP.
-		 */
-		clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
                 /* go to sleep */
                 wait_event(wait_struct.queue, wait_struct.resolved);
         }