X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fsparc64%2Fmm%2Ffault.c;h=e2027f27c0fe73f2f43546aa838577e86fc6e3ba;hb=f10f114f199dbcb9e1d6b5a0b36a34acf93f6179;hp=55ae802dc0ad6ffd6c06b9bd12e860f9a777267b;hpb=0a7d5f8ce960e74fa22986bda4af488539796e49;p=linux-2.6

diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
index 55ae802dc0..e2027f27c0 100644
--- a/arch/sparc64/mm/fault.c
+++ b/arch/sparc64/mm/fault.c
@@ -15,11 +15,11 @@
 #include <linux/signal.h>
 #include <linux/mm.h>
 #include <linux/module.h>
-#include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kprobes.h>
 #include <linux/kallsyms.h>
+#include <linux/kdebug.h>
 
 #include <asm/page.h>
 #include <asm/pgtable.h>
@@ -29,40 +29,26 @@
 #include <asm/asi.h>
 #include <asm/lsu.h>
 #include <asm/sections.h>
-#include <asm/kdebug.h>
 #include <asm/mmu_context.h>
 
 #ifdef CONFIG_KPROBES
-ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
-
-/* Hook to register for page fault notifications */
-int register_page_fault_notifier(struct notifier_block *nb)
-{
-	return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
-}
-
-int unregister_page_fault_notifier(struct notifier_block *nb)
+static inline int notify_page_fault(struct pt_regs *regs)
 {
-	return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
-}
-
-static inline int notify_page_fault(enum die_val val, const char *str,
-			struct pt_regs *regs, long err, int trap, int sig)
-{
-	struct die_args args = {
-		.regs = regs,
-		.str = str,
-		.err = err,
-		.trapnr = trap,
-		.signr = sig
-	};
-	return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
+	int ret = 0;
+
+	/* kprobe_running() needs smp_processor_id() */
+	if (!user_mode(regs)) {
+		preempt_disable();
+		if (kprobe_running() && kprobe_fault_handler(regs, 0))
+			ret = 1;
+		preempt_enable();
+	}
+	return ret;
 }
 #else
-static inline int notify_page_fault(enum die_val val, const char *str,
-			struct pt_regs *regs, long err, int trap, int sig)
+static inline int notify_page_fault(struct pt_regs *regs)
 {
-	return NOTIFY_DONE;
+	return 0;
 }
 #endif
 
@@ -121,23 +107,17 @@ static void __kprobes unhandled_fault(unsigned long address,
 	printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %016lx\n",
 	       (tsk->mm ? (unsigned long) tsk->mm->pgd :
 		          (unsigned long) tsk->active_mm->pgd));
-	if (notify_die(DIE_GPF, "general protection fault", regs,
-		       0, 0, SIGSEGV) == NOTIFY_STOP)
-		return;
 	die_if_kernel("Oops", regs);
 }
 
 static void bad_kernel_pc(struct pt_regs *regs, unsigned long vaddr)
 {
-	unsigned long *ksp;
-
 	printk(KERN_CRIT "OOPS: Bogus kernel PC [%016lx] in fault handler\n",
 	       regs->tpc);
 	printk(KERN_CRIT "OOPS: RPC [%016lx]\n", regs->u_regs[15]);
 	print_symbol("RPC: <%s>\n", regs->u_regs[15]);
 	printk(KERN_CRIT "OOPS: Fault was to vaddr[%lx]\n", vaddr);
-	__asm__("mov %%sp, %0" : "=r" (ksp));
-	show_stack(current, ksp);
+	dump_stack();
 	unhandled_fault(regs->tpc, current, regs);
 }
 
@@ -295,13 +275,12 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma;
 	unsigned int insn = 0;
-	int si_code, fault_code;
+	int si_code, fault_code, fault;
 	unsigned long address, mm_rss;
 
 	fault_code = get_thread_fault_code();
 
-	if (notify_page_fault(DIE_PAGE_FAULT, "page_fault", regs,
-		       fault_code, 0, SIGSEGV) == NOTIFY_STOP)
+	if (notify_page_fault(regs))
 		return;
 
 	si_code = SEGV_MAPERR;
@@ -433,20 +412,18 @@ good_area:
 			goto bad_area;
 	}
 
-	switch (handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE))) {
-	case VM_FAULT_MINOR:
-		current->min_flt++;
-		break;
-	case VM_FAULT_MAJOR:
-		current->maj_flt++;
-		break;
-	case VM_FAULT_SIGBUS:
-		goto do_sigbus;
-	case VM_FAULT_OOM:
-		goto out_of_memory;
-	default:
+	fault = handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE));
+	if (unlikely(fault & VM_FAULT_ERROR)) {
+		if (fault & VM_FAULT_OOM)
+			goto out_of_memory;
+		else if (fault & VM_FAULT_SIGBUS)
+			goto do_sigbus;
 		BUG();
 	}
+	if (fault & VM_FAULT_MAJOR)
+		current->maj_flt++;
+	else
+		current->min_flt++;
 
 	up_read(&mm->mmap_sem);
 
@@ -486,7 +463,7 @@ out_of_memory:
 	up_read(&mm->mmap_sem);
 	printk("VM: killing process %s\n", current->comm);
 	if (!(regs->tstate & TSTATE_PRIV))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto handle_kernel_fault;
 
 intr_or_no_mm: