[src/trunk]: src/sys Convert the coredump_vec modular function pointer to use...

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

details:   https://anonhg.NetBSD.org/src/rev/9ba5ffeb006d
branches:  trunk
changeset: 966664:9ba5ffeb006d
user:      pgoyette <pgoyette%NetBSD.org@localhost>
date:      Sun Nov 10 14:20:50 2019 +0000

description:
Convert the coredump_vec modular function pointer to use the new
compat_hook mechanism.

XXX Should be pulled up to -9 despite the kernel <--> module ABI
XXX change.

diffstat:

 sys/kern/compat_stub.c       |   7 ++++++-
 sys/kern/kern_core.c         |  13 +++++++------
 sys/kern/kern_sig.c          |   9 +++------
 sys/kern/sys_ptrace_common.c |   7 ++++---
 sys/sys/compat_stub.h        |   7 ++++++-
 sys/sys/signalvar.h          |   7 +------
 6 files changed, 27 insertions(+), 23 deletions(-)

diffs (178 lines):

diff -r 05f77dde6101 -r 9ba5ffeb006d sys/kern/compat_stub.c
--- a/sys/kern/compat_stub.c    Sun Nov 10 13:34:52 2019 +0000
+++ b/sys/kern/compat_stub.c    Sun Nov 10 14:20:50 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: compat_stub.c,v 1.16 2019/11/10 13:28:06 pgoyette Exp $    */
+/* $NetBSD: compat_stub.c,v 1.17 2019/11/10 14:20:50 pgoyette Exp $    */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -279,3 +279,8 @@
  * Hook for sendsig_sigcontext_16
  */
 struct sendsig_sigcontext_16_hook_t sendsig_sigcontext_16_hook;
+
+/*
+ * Hook for coredumps
+ */
+struct coredump_hook_t coredump_hook;
diff -r 05f77dde6101 -r 9ba5ffeb006d sys/kern/kern_core.c
--- a/sys/kern/kern_core.c      Sun Nov 10 13:34:52 2019 +0000
+++ b/sys/kern/kern_core.c      Sun Nov 10 14:20:50 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_core.c,v 1.26 2019/10/16 18:29:49 christos Exp $  */
+/*     $NetBSD: kern_core.c,v 1.27 2019/11/10 14:20:50 pgoyette Exp $  */
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1991, 1993
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_core.c,v 1.26 2019/10/16 18:29:49 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_core.c,v 1.27 2019/11/10 14:20:50 pgoyette Exp $");
 
 #include <sys/param.h>
 #include <sys/vnode.h>
@@ -50,6 +50,7 @@
 #include <sys/filedesc.h>
 #include <sys/kauth.h>
 #include <sys/module.h>
+#include <sys/compat_stub.h>
 
 MODULE(MODULE_CLASS_MISC, coredump, NULL);
 
@@ -69,17 +70,17 @@
 
        switch (cmd) {
        case MODULE_CMD_INIT:
-               coredump_vec = coredump;
+               MODULE_HOOK_SET(coredump_hook, "coredump", coredump);
                return 0;
        case MODULE_CMD_FINI:
                /*
-                * In theory we don't need to patch this, as the various
+                * In theory we don't need to UNSET this, as the various
                 * exec formats depend on this module.  If this module has
                 * no references, and so can be unloaded, no user programs
                 * can be running and so nothing can call *coredump_vec.
                 */
-               coredump_vec = __FPTRCAST(
-                   int (*)(struct lwp *, const char *), enosys);
+
+               MODULE_HOOK_UNSET(coredump_hook);
                return 0;
        default:
                return ENOTTY;
diff -r 05f77dde6101 -r 9ba5ffeb006d sys/kern/kern_sig.c
--- a/sys/kern/kern_sig.c       Sun Nov 10 13:34:52 2019 +0000
+++ b/sys/kern/kern_sig.c       Sun Nov 10 14:20:50 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_sig.c,v 1.377 2019/11/10 13:28:06 pgoyette Exp $  */
+/*     $NetBSD: kern_sig.c,v 1.378 2019/11/10 14:20:50 pgoyette Exp $  */
 
 /*-
  * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_sig.c,v 1.377 2019/11/10 13:28:06 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_sig.c,v 1.378 2019/11/10 14:20:50 pgoyette Exp $");
 
 #include "opt_ptrace.h"
 #include "opt_dtrace.h"
@@ -132,9 +132,6 @@
 static void    sigacts_poolpage_free(struct pool *, void *);
 static void    *sigacts_poolpage_alloc(struct pool *, int);
 
-int (*coredump_vec)(struct lwp *, const char *) =
-    __FPTRCAST(int (*)(struct lwp *, const char *), enosys);
-
 /*
  * DTrace SDT provider definitions
  */
@@ -2289,7 +2286,7 @@
 
        if (docore) {
                mutex_exit(p->p_lock);
-               error = (*coredump_vec)(l, NULL);
+               MODULE_HOOK_CALL(coredump_hook, (l, NULL), enosys(), error);
 
                if (kern_logsigexit) {
                        int uid = l->l_cred ?
diff -r 05f77dde6101 -r 9ba5ffeb006d sys/kern/sys_ptrace_common.c
--- a/sys/kern/sys_ptrace_common.c      Sun Nov 10 13:34:52 2019 +0000
+++ b/sys/kern/sys_ptrace_common.c      Sun Nov 10 14:20:50 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sys_ptrace_common.c,v 1.69 2019/10/16 18:29:49 christos Exp $  */
+/*     $NetBSD: sys_ptrace_common.c,v 1.70 2019/11/10 14:20:50 pgoyette Exp $  */
 
 /*-
  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -118,7 +118,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_ptrace_common.c,v 1.69 2019/10/16 18:29:49 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_ptrace_common.c,v 1.70 2019/11/10 14:20:50 pgoyette Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ptrace.h"
@@ -148,6 +148,7 @@
 #include <sys/module.h>
 #include <sys/condvar.h>
 #include <sys/mutex.h>
+#include <sys/compat_stub.h>
 
 #include <uvm/uvm_extern.h>
 
@@ -958,7 +959,7 @@
                path[len] = '\0';
        }
        DPRINTF(("%s: lwp=%d\n", __func__, lt->l_lid));
-       error = (*coredump_vec)(lt, path);
+       MODULE_HOOK_CALL(coredump_hook, (lt, path), enosys(), error);
 out:
        if (path)
                kmem_free(path, len + 1);
diff -r 05f77dde6101 -r 9ba5ffeb006d sys/sys/compat_stub.h
--- a/sys/sys/compat_stub.h     Sun Nov 10 13:34:52 2019 +0000
+++ b/sys/sys/compat_stub.h     Sun Nov 10 14:20:50 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: compat_stub.h,v 1.20 2019/11/10 13:28:06 pgoyette Exp $        */
+/*     $NetBSD: compat_stub.h,v 1.21 2019/11/10 14:20:50 pgoyette Exp $        */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -366,4 +366,9 @@
 MODULE_HOOK(sendsig_sigcontext_16_hook, void,
     (const struct ksiginfo *, const sigset_t *));
 
+/*
+ * Hook for coredumps
+ */
+MODULE_HOOK(coredump_hook, int, (struct lwp *, const char *));
+
 #endif /* _SYS_COMPAT_STUB_H */
diff -r 05f77dde6101 -r 9ba5ffeb006d sys/sys/signalvar.h
--- a/sys/sys/signalvar.h       Sun Nov 10 13:34:52 2019 +0000
+++ b/sys/sys/signalvar.h       Sun Nov 10 14:20:50 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: signalvar.h,v 1.98 2019/11/10 13:28:06 pgoyette Exp $  */
+/*     $NetBSD: signalvar.h,v 1.99 2019/11/10 14:20:50 pgoyette Exp $  */
 
 /*
  * Copyright (c) 1991, 1993
@@ -202,11 +202,6 @@
 extern struct pool ksiginfo_pool;
 
 /*
- * Modularity / compatibility.
- */
-extern int     (*coredump_vec)(struct lwp *, const char *);
-
-/*
  * firstsig:
  *
  *     Return the first signal in a signal set.