[src/trunk]: src/sys/sys add dtrace syscall glue:

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

details:   https://anonhg.NetBSD.org/src/rev/78a7cd5a45c3
branches:  trunk
changeset: 806741:78a7cd5a45c3
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Mar 07 16:34:55 2015 +0000

description:
add dtrace syscall glue:
- adds 2 members to sysent: these are the entry and exit probe ids
  they are non-zero only when dtrace is loaded
- add an emul specific probe for dtrace: this is NULL unless the emulation
  supports dtrace and is loaded
- adjust the syscall stub call trace_enter/exit if needed for systrace
- add more info to trace_enter and exit needed by systrace

diffstat:

 sys/sys/param.h |   4 ++--
 sys/sys/proc.h  |   7 ++++++-
 sys/sys/systm.h |  10 +++++++---
 3 files changed, 15 insertions(+), 6 deletions(-)

diffs (77 lines):

diff -r 1fecadbb5546 -r 78a7cd5a45c3 sys/sys/param.h
--- a/sys/sys/param.h   Sat Mar 07 15:49:20 2015 +0000
+++ b/sys/sys/param.h   Sat Mar 07 16:34:55 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: param.h,v 1.465 2015/02/14 12:59:02 he Exp $   */
+/*     $NetBSD: param.h,v 1.466 2015/03/07 16:34:55 christos Exp $     */
 
 /*-
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -63,7 +63,7 @@
  *     2.99.9          (299000900)
  */
 
-#define        __NetBSD_Version__      799000500       /* NetBSD 7.99.5 */
+#define        __NetBSD_Version__      799000600       /* NetBSD 7.99.6 */
 
 #define __NetBSD_Prereq__(M,m,p) (((((M) * 100000000) + \
     (m) * 1000000) + (p) * 100) <= __NetBSD_Version__)
diff -r 1fecadbb5546 -r 78a7cd5a45c3 sys/sys/proc.h
--- a/sys/sys/proc.h    Sat Mar 07 15:49:20 2015 +0000
+++ b/sys/sys/proc.h    Sat Mar 07 16:34:55 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: proc.h,v 1.320 2014/02/21 22:06:48 skrll Exp $ */
+/*     $NetBSD: proc.h,v 1.321 2015/03/07 16:34:55 christos Exp $      */
 
 /*-
  * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -177,6 +177,11 @@
 
        size_t          e_ucsize;       /* size of ucontext_t */
        void            (*e_startlwp)(void *);
+
+       /* Dtrace syscall probe */
+       void            (*e_dtrace_syscall)(uint32_t, register_t,
+                           const struct sysent *, const void *,
+                           const register_t *, int);
 };
 
 /*
diff -r 1fecadbb5546 -r 78a7cd5a45c3 sys/sys/systm.h
--- a/sys/sys/systm.h   Sat Mar 07 15:49:20 2015 +0000
+++ b/sys/sys/systm.h   Sat Mar 07 16:34:55 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: systm.h,v 1.266 2014/08/03 12:49:32 wiz Exp $  */
+/*     $NetBSD: systm.h,v 1.267 2015/03/07 16:34:55 christos Exp $     */
 
 /*-
  * Copyright (c) 1982, 1988, 1991, 1993
@@ -57,6 +57,7 @@
 struct clockframe;
 struct lwp;
 struct proc;
+struct sysent;
 struct timeval;
 struct tty;
 struct uio;
@@ -120,6 +121,8 @@
        short   sy_argsize;     /* total size of arguments */
        int     sy_flags;       /* flags. see below */
        sy_call_t *sy_call;     /* implementing function */
+       uint32_t sy_entry;      /* DTrace entry ID for systrace. */
+       uint32_t sy_return;     /* DTrace return ID for systrace. */
 } sysent[];
 extern int nsysent;
 #if    BYTE_ORDER == BIG_ENDIAN
@@ -388,8 +391,9 @@
  */
 #ifdef _KERNEL
 bool   trace_is_enabled(struct proc *);
-int    trace_enter(register_t, const register_t *, int);
-void   trace_exit(register_t, register_t [], int);
+int    trace_enter(register_t, const struct sysent *, const void *);
+void   trace_exit(register_t, const struct sysent *, const void *,
+    register_t [], int);
 #endif
 
 int    uiomove(void *, size_t, struct uio *);