--- zzzz-none-000/linux-4.4.271/arch/arm/mm/fault.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/arch/arm/mm/fault.c	2023-04-19 10:22:27.000000000 +0000
@@ -25,9 +25,23 @@
 #include <asm/system_misc.h>
 #include <asm/system_info.h>
 #include <asm/tlbflush.h>
+#if defined(CONFIG_AVM_SIMPLE_PROFILING)
+#include <avm/profile/profile.h>
+#endif/*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING) ---*/
+#if defined(CONFIG_AVM_POWER) 
+#include <avm/power/power.h>
+#endif /*--- #if defined(CONFIG_AVM_POWER) ---*/
+
+#if defined(CONFIG_AVM_FASTIRQ)
+#include <asm/avm_enh/avm_fiq_os.h>
+#endif/*--- #if defined(CONFIG_AVM_FASTIRQ) ---*/
+
+#include <asm/avm_enh/avm_crash_handling.h>
 
 #include "fault.h"
 
+#include <trace/events/exception.h>
+
 #ifdef CONFIG_MMU
 
 #ifdef CONFIG_KPROBES
@@ -141,6 +155,8 @@
 	/*
 	 * No handler, we'll have to terminate things with extreme prejudice.
 	 */
+	start_avm_crash_path(regs);
+
 	bust_spinlocks(1);
 	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
 		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
@@ -163,6 +179,7 @@
 {
 	struct siginfo si;
 
+	trace_user_fault(tsk, addr, fsr);
 	if (addr > TASK_SIZE)
 		harden_branch_predictor();
 
@@ -246,7 +263,18 @@
 		goto out;
 	}
 
-	return handle_mm_fault(mm, vma, addr & PAGE_MASK, flags);
+	/*
+	 * If for any reason at all we couldn't handle the fault, make
+	 * sure we exit gracefully rather than endlessly redo the fault.
+	 */
+#if defined(CONFIG_AVM_POWER)
+    avm_page_statistic_fault_get();
+#endif/*--- #if defined(CONFIG_AVM_POWER) ---*/
+	fault = handle_mm_fault(mm, vma, addr & PAGE_MASK, flags);
+#if defined(CONFIG_AVM_POWER)
+    avm_page_statistic_fault_put();
+#endif/*--- #if defined(CONFIG_AVM_POWER) ---*/
+	return fault;
 
 check_stack:
 	/* Don't allow expansion below FIRST_USER_ADDRESS */
@@ -265,6 +293,10 @@
 	int fault, sig, code;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
+#if defined(CONFIG_AVM_SIMPLE_PROFILING) 
+    avm_simple_profiling_enter_irq_context(regs->ARM_pc, regs->ARM_lr);
+#endif/*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING)  ---*/
+
 	if (notify_page_fault(regs, fsr))
 		return 0;
 
@@ -311,7 +343,13 @@
 #endif
 	}
 
+#if defined(CONFIG_AVM_SIMPLE_PROFILING) 
+    avm_simple_profiling_log(avm_profile_data_type_hw_irq_begin, (unsigned int)regs->ARM_pc, AVM_PROFILE_PAGE_FAULT_ID);
+#endif/*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING)  ---*/
 	fault = __do_page_fault(mm, addr, fsr, flags, tsk);
+#if defined(CONFIG_AVM_SIMPLE_PROFILING) 
+    avm_simple_profiling_log(avm_profile_data_type_hw_irq_end, (unsigned int)regs->ARM_pc, AVM_PROFILE_PAGE_FAULT_ID);
+#endif/*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING)  ---*/
 
 	/* If we need to retry but a fatal signal is pending, handle the
 	 * signal first. We do not need to release the mmap_sem because
@@ -436,6 +474,10 @@
 	if (addr < TASK_SIZE)
 		return do_page_fault(addr, fsr, regs);
 
+#if defined(CONFIG_AVM_SIMPLE_PROFILING) 
+    avm_simple_profiling_enter_irq_context(regs->ARM_pc, regs->ARM_lr);
+#endif/*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING)  ---*/
+
 	if (user_mode(regs))
 		goto bad_area;
 
@@ -558,6 +600,9 @@
 
 	pr_alert("Unhandled fault: %s (0x%03x) at 0x%08lx\n",
 		inf->name, fsr, addr);
+
+	start_avm_crash_path(regs);
+
 	show_pte(current->mm, addr);
 
 	info.si_signo = inf->sig;
@@ -592,6 +637,8 @@
 	pr_alert("Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",
 		inf->name, ifsr, addr);
 
+	start_avm_crash_path(regs);
+
 	info.si_signo = inf->sig;
 	info.si_errno = 0;
 	info.si_code  = inf->code;