From 3ded2c8e6ce800581c61c8e04ef76cff12ced58a Mon Sep 17 00:00:00 2001
From: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Date: Sun, 26 Mar 2006 01:38:24 -0800
Subject: [PATCH] --- yaml --- r: 24112 b: refs/heads/master c:
 50e21f2b2861711b6df0b72ffef4a70d1532b023 h: refs/heads/master v: v3

---
 [refs]                              |  2 +-
 trunk/arch/powerpc/kernel/kprobes.c | 63 +++++++++++++++++++++++++----
 2 files changed, 56 insertions(+), 9 deletions(-)

diff --git a/[refs] b/[refs]
index 14aa1a2a8b31..adf75a3b5b6f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c28f896634f2c931a298490deab3861ab117716a
+refs/heads/master: 50e21f2b2861711b6df0b72ffef4a70d1532b023
diff --git a/trunk/arch/powerpc/kernel/kprobes.c b/trunk/arch/powerpc/kernel/kprobes.c
index aea25dd18dae..ad7a90212204 100644
--- a/trunk/arch/powerpc/kernel/kprobes.c
+++ b/trunk/arch/powerpc/kernel/kprobes.c
@@ -30,9 +30,11 @@
 #include <linux/kprobes.h>
 #include <linux/ptrace.h>
 #include <linux/preempt.h>
+#include <linux/module.h>
 #include <asm/cacheflush.h>
 #include <asm/kdebug.h>
 #include <asm/sstep.h>
+#include <asm/uaccess.h>
 
 DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
 DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
@@ -372,17 +374,62 @@ static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
 {
 	struct kprobe *cur = kprobe_running();
 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
-		return 1;
-
-	if (kcb->kprobe_status & KPROBE_HIT_SS) {
-		resume_execution(cur, regs);
+	const struct exception_table_entry *entry;
+
+	switch(kcb->kprobe_status) {
+	case KPROBE_HIT_SS:
+	case KPROBE_REENTER:
+		/*
+		 * We are here because the instruction being single
+		 * stepped caused a page fault. We reset the current
+		 * kprobe and the nip points back to the probe address
+		 * and allow the page fault handler to continue as a
+		 * normal page fault.
+		 */
+		regs->nip = (unsigned long)cur->addr;
 		regs->msr &= ~MSR_SE;
 		regs->msr |= kcb->kprobe_saved_msr;
-
-		reset_current_kprobe();
+		if (kcb->kprobe_status == KPROBE_REENTER)
+			restore_previous_kprobe(kcb);
+		else
+			reset_current_kprobe();
 		preempt_enable_no_resched();
+		break;
+	case KPROBE_HIT_ACTIVE:
+	case KPROBE_HIT_SSDONE:
+		/*
+		 * We increment the nmissed count for accounting,
+		 * we can also use npre/npostfault count for accouting
+		 * these specific fault cases.
+		 */
+		kprobes_inc_nmissed_count(cur);
+
+		/*
+		 * We come here because instructions in the pre/post
+		 * handler caused the page_fault, this could happen
+		 * if handler tries to access user space by
+		 * copy_from_user(), get_user() etc. Let the
+		 * user-specified handler try to fix it first.
+		 */
+		if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
+			return 1;
+
+		/*
+		 * In case the user-specified fault handler returned
+		 * zero, try to fix up.
+		 */
+		if ((entry = search_exception_tables(regs->nip)) != NULL) {
+			regs->nip = entry->fixup;
+			return 1;
+		}
+
+		/*
+		 * fixup_exception() could not handle it,
+		 * Let do_page_fault() fix it.
+		 */
+		break;
+	default:
+		break;
 	}
 	return 0;
 }