[src/trunk]: src/sys/arch/x86 Export x86_dbregs_{save/restore}, will be used ...

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

details:   https://anonhg.NetBSD.org/src/rev/2aabd32f6ee0
branches:  trunk
changeset: 836113:2aabd32f6ee0
user:      maxv <maxv%NetBSD.org@localhost>
date:      Thu Sep 27 13:04:21 2018 +0000

description:
Export x86_dbregs_{save/restore}, will be used outside. Reproduce some
internal dbregs logic in them.

diffstat:

 sys/arch/x86/include/dbregs.h |   6 +++++-
 sys/arch/x86/x86/dbregs.c     |  14 +++++++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diffs (63 lines):

diff -r 28e50e8c08d7 -r 2aabd32f6ee0 sys/arch/x86/include/dbregs.h
--- a/sys/arch/x86/include/dbregs.h     Thu Sep 27 07:09:29 2018 +0000
+++ b/sys/arch/x86/include/dbregs.h     Thu Sep 27 13:04:21 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dbregs.h,v 1.6 2018/07/26 09:29:08 maxv Exp $  */
+/*     $NetBSD: dbregs.h,v 1.7 2018/09/27 13:04:22 maxv Exp $  */
 
 /*
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -110,6 +110,10 @@
 void x86_dbregs_clear(struct lwp *);
 void x86_dbregs_abandon(struct lwp *);
 void x86_dbregs_read(struct lwp *, struct dbreg *);
+
+void x86_dbregs_save(struct lwp *);
+void x86_dbregs_restore(struct lwp *);
+
 void x86_dbregs_store_dr6(struct lwp *);
 int x86_dbregs_user_trap(void);
 int x86_dbregs_validate(const struct dbreg *);
diff -r 28e50e8c08d7 -r 2aabd32f6ee0 sys/arch/x86/x86/dbregs.c
--- a/sys/arch/x86/x86/dbregs.c Thu Sep 27 07:09:29 2018 +0000
+++ b/sys/arch/x86/x86/dbregs.c Thu Sep 27 13:04:21 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dbregs.c,v 1.11 2018/07/26 09:29:08 maxv Exp $ */
+/*     $NetBSD: dbregs.c,v 1.12 2018/09/27 13:04:21 maxv Exp $ */
 
 /*
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -144,11 +144,15 @@
        memcpy(regs, pcb->pcb_dbregs, sizeof(*regs));
 }
 
-static void
+void
 x86_dbregs_save(struct lwp *l)
 {
        struct pcb *pcb = lwp_getpcb(l);
 
+       if (!(pcb->pcb_flags & PCB_DBREGS)) {
+               return;
+       }
+
        KASSERT(pcb->pcb_dbregs != NULL);
 
        pcb->pcb_dbregs->dr[0] = rdr0();
@@ -160,11 +164,15 @@
        pcb->pcb_dbregs->dr[7] = rdr7();
 }
 
-static void
+void
 x86_dbregs_restore(struct lwp *l)
 {
        struct pcb *pcb = lwp_getpcb(l);
 
+       if (!(pcb->pcb_flags & PCB_DBREGS)) {
+               return;
+       }
+
        KASSERT(pcb->pcb_dbregs != NULL);
 
        ldr0(pcb->pcb_dbregs->dr[0]);