[src/trunk]: src/sys/arch/aarch64/aarch64 Add KDTRACE_HOOKS support.

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ac137ab51b8b
branches:  trunk
changeset: 465780:ac137ab51b8b
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Tue Dec 03 22:02:43 2019 +0000

description:
Add KDTRACE_HOOKS support.

diffstat:

 sys/arch/aarch64/aarch64/trap.c |  29 ++++++++++++++++++++++++++---
 1 files changed, 26 insertions(+), 3 deletions(-)

diffs (74 lines):

diff -r 7ffdfeb0510d -r ac137ab51b8b sys/arch/aarch64/aarch64/trap.c
--- a/sys/arch/aarch64/aarch64/trap.c   Tue Dec 03 16:45:21 2019 +0000
+++ b/sys/arch/aarch64/aarch64/trap.c   Tue Dec 03 22:02:43 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: trap.c,v 1.21 2019/11/24 04:08:36 rin Exp $ */
+/* $NetBSD: trap.c,v 1.22 2019/12/03 22:02:43 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -31,10 +31,11 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(1, "$NetBSD: trap.c,v 1.21 2019/11/24 04:08:36 rin Exp $");
+__KERNEL_RCSID(1, "$NetBSD: trap.c,v 1.22 2019/12/03 22:02:43 jmcneill Exp $");
 
 #include "opt_arm_intr_impl.h"
 #include "opt_compat_netbsd32.h"
+#include "opt_dtrace.h"
 
 #include <sys/param.h>
 #include <sys/kauth.h>
@@ -73,11 +74,20 @@
 #include <ddb/db_output.h>
 #include <machine/db_machdep.h>
 #endif
+#ifdef KDTRACE_HOOKS
+#include <sys/dtrace_bsd.h>
+#endif
 
 #ifdef DDB
 int sigill_debug = 0;
 #endif
 
+#ifdef KDTRACE_HOOKS
+dtrace_doubletrap_func_t       dtrace_doubletrap_func = NULL;
+dtrace_trap_func_t             dtrace_trap_func = NULL;
+int (*dtrace_invop_jump_addr)(struct trapframe *);
+#endif
+
 const char * const trap_names[] = {
        [ESR_EC_UNKNOWN]        = "Unknown Reason (Illegal Instruction)",
        [ESR_EC_SERROR]         = "SError Interrupt",
@@ -182,16 +192,29 @@
        else
                daif_enable(DAIF_D|DAIF_A);
 
+#ifdef KDTRACE_HOOKS
+       if (dtrace_trap_func != NULL && (*dtrace_trap_func)(tf, eclass))
+               return;
+#endif
+
        switch (eclass) {
        case ESR_EC_INSN_ABT_EL1:
        case ESR_EC_DATA_ABT_EL1:
                data_abort_handler(tf, eclass);
                break;
 
+       case ESR_EC_BKPT_INSN_A64:
+#ifdef KDTRACE_HOOKS
+               if (__SHIFTOUT(esr, ESR_ISS) == 0x40d &&
+                   dtrace_invop_jump_addr != 0) {
+                       (*dtrace_invop_jump_addr)(tf);
+                       break;
+               }
+               /* FALLTHROUGH */
+#endif
        case ESR_EC_BRKPNT_EL1:
        case ESR_EC_SW_STEP_EL1:
        case ESR_EC_WTCHPNT_EL1:
-       case ESR_EC_BKPT_INSN_A64:
 #ifdef DDB
                if (eclass == ESR_EC_BRKPNT_EL1)
                        kdb_trap(DB_TRAP_BREAKPOINT, tf);