From: Jiamin Ma <jiamin.ma@amlogic.com>
Date: Wed, 12 Dec 2018 09:37:01 +0000 (+0800)
Subject: debug: show pfn info when undefined instr happens at user space [1/1]
X-Git-Tag: hardkernel-4.9.236-104~2033
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=820dbdca725477a45321547280f93d8483a927cb;p=platform%2Fkernel%2Flinux-amlogic.git

debug: show pfn info when undefined instr happens at user space [1/1]

PD#SWPL-3076

Problem:
Lack of debug infos when undefined instr happens at user space

Solution:
Call show_all_pfn when undefined instr happens at user space

Verify:
Locally on ampere

Change-Id: Id24e797c2781c94c507ad07ec17a3d4ae7d44cd9
Signed-off-by: Jiamin Ma <jiamin.ma@amlogic.com>
---

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 6a32470..95cf506 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -491,6 +491,10 @@ die_sig:
 	if (user_debug & UDBG_UNDEFINED) {
 		pr_info("%s (%d): undefined instruction: pc=%p\n",
 			current->comm, task_pid_nr(current), pc);
+#ifdef CONFIG_AMLOGIC_USER_FAULT
+		if (user_fault_debug_ratelimited())
+			show_all_pfn(current, regs);
+#endif
 		__show_regs(regs);
 		dump_instr(KERN_INFO, regs);
 	}
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 6e2d130f..5f2f085 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -418,6 +418,10 @@ static void force_signal_inject(int signal, int code, struct pt_regs *regs,
 	    show_unhandled_signals_ratelimited()) {
 		pr_info("%s[%d]: %s: pc=%p\n",
 			current->comm, task_pid_nr(current), desc, pc);
+#ifdef CONFIG_AMLOGIC_USER_FAULT
+		show_all_pfn(current, regs);
+		show_regs(regs);
+#endif
 		dump_instr(KERN_INFO, regs);
 	}