[src/trunk]: src/sys/kern execve_runproc: Isolate emul specific code into a f...

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

details:   https://anonhg.NetBSD.org/src/rev/e4ad1c9bebfd
branches:  trunk
changeset: 795600:e4ad1c9bebfd
user:      uebayasi <uebayasi%NetBSD.org@localhost>
date:      Sun Apr 20 00:20:01 2014 +0000

description:
execve_runproc: Isolate emul specific code into a function.

diffstat:

 sys/kern/kern_exec.c |  119 +++++++++++++++++++++++++++-----------------------
 1 files changed, 64 insertions(+), 55 deletions(-)

diffs (147 lines):

diff -r cef108bab2f4 -r e4ad1c9bebfd sys/kern/kern_exec.c
--- a/sys/kern/kern_exec.c      Sat Apr 19 23:00:27 2014 +0000
+++ b/sys/kern/kern_exec.c      Sun Apr 20 00:20:01 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_exec.c,v 1.405 2014/04/19 23:00:27 uebayasi Exp $ */
+/*     $NetBSD: kern_exec.c,v 1.406 2014/04/20 00:20:01 uebayasi Exp $ */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -59,7 +59,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.405 2014/04/19 23:00:27 uebayasi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.406 2014/04/20 00:20:01 uebayasi Exp $");
 
 #include "opt_exec.h"
 #include "opt_execfmt.h"
@@ -1004,6 +1004,67 @@
        return 0;
 }
 
+static void
+emulexec(struct lwp *l, struct exec_package *epp)
+{
+       struct proc             *p = l->l_proc;
+
+       /* The emulation root will usually have been found when we looked
+        * for the elf interpreter (or similar), if not look now. */
+       if (epp->ep_esch->es_emul->e_path != NULL &&
+           epp->ep_emul_root == NULL)
+               emul_find_root(l, epp);
+
+       /* Any old emulation root got removed by fdcloseexec */
+       rw_enter(&p->p_cwdi->cwdi_lock, RW_WRITER);
+       p->p_cwdi->cwdi_edir = epp->ep_emul_root;
+       rw_exit(&p->p_cwdi->cwdi_lock);
+       epp->ep_emul_root = NULL;
+       if (epp->ep_interp != NULL)
+               vrele(epp->ep_interp);
+
+       /*
+        * Call emulation specific exec hook. This can setup per-process
+        * p->p_emuldata or do any other per-process stuff an emulation needs.
+        *
+        * If we are executing process of different emulation than the
+        * original forked process, call e_proc_exit() of the old emulation
+        * first, then e_proc_exec() of new emulation. If the emulation is
+        * same, the exec hook code should deallocate any old emulation
+        * resources held previously by this process.
+        */
+       if (p->p_emul && p->p_emul->e_proc_exit
+           && p->p_emul != epp->ep_esch->es_emul)
+               (*p->p_emul->e_proc_exit)(p);
+
+       /*
+        * This is now LWP 1.
+        */
+       /* XXX elsewhere */
+       mutex_enter(p->p_lock);
+       p->p_nlwpid = 1;
+       l->l_lid = 1;
+       mutex_exit(p->p_lock);
+
+       /*
+        * Call exec hook. Emulation code may NOT store reference to anything
+        * from &pack.
+        */
+       if (epp->ep_esch->es_emul->e_proc_exec)
+               (*epp->ep_esch->es_emul->e_proc_exec)(p, epp);
+
+       /* update p_emul, the old value is no longer needed */
+       p->p_emul = epp->ep_esch->es_emul;
+
+       /* ...and the same for p_execsw */
+       p->p_execsw = epp->ep_esch;
+
+#ifdef __HAVE_SYSCALL_INTERN
+       (*p->p_emul->e_syscall_intern)(p);
+#endif
+       ktremul();
+}
+
 static int
 execve_runproc(struct lwp *l, struct execve_data * restrict data,
        bool no_local_exec_lock, bool is_spawn)
@@ -1177,59 +1238,7 @@
 
        SDT_PROBE(proc,,,exec_success, epp->ep_name, 0, 0, 0, 0);
 
-       /* The emulation root will usually have been found when we looked
-        * for the elf interpreter (or similar), if not look now. */
-       if (epp->ep_esch->es_emul->e_path != NULL &&
-           epp->ep_emul_root == NULL)
-               emul_find_root(l, epp);
-
-       /* Any old emulation root got removed by fdcloseexec */
-       rw_enter(&p->p_cwdi->cwdi_lock, RW_WRITER);
-       p->p_cwdi->cwdi_edir = epp->ep_emul_root;
-       rw_exit(&p->p_cwdi->cwdi_lock);
-       epp->ep_emul_root = NULL;
-       if (epp->ep_interp != NULL)
-               vrele(epp->ep_interp);
-
-       /*
-        * Call emulation specific exec hook. This can setup per-process
-        * p->p_emuldata or do any other per-process stuff an emulation needs.
-        *
-        * If we are executing process of different emulation than the
-        * original forked process, call e_proc_exit() of the old emulation
-        * first, then e_proc_exec() of new emulation. If the emulation is
-        * same, the exec hook code should deallocate any old emulation
-        * resources held previously by this process.
-        */
-       if (p->p_emul && p->p_emul->e_proc_exit
-           && p->p_emul != epp->ep_esch->es_emul)
-               (*p->p_emul->e_proc_exit)(p);
-
-       /*
-        * This is now LWP 1.
-        */
-       mutex_enter(p->p_lock);
-       p->p_nlwpid = 1;
-       l->l_lid = 1;
-       mutex_exit(p->p_lock);
-
-       /*
-        * Call exec hook. Emulation code may NOT store reference to anything
-        * from &pack.
-        */
-       if (epp->ep_esch->es_emul->e_proc_exec)
-               (*epp->ep_esch->es_emul->e_proc_exec)(p, epp);
-
-       /* update p_emul, the old value is no longer needed */
-       p->p_emul = epp->ep_esch->es_emul;
-
-       /* ...and the same for p_execsw */
-       p->p_execsw = epp->ep_esch;
-
-#ifdef __HAVE_SYSCALL_INTERN
-       (*p->p_emul->e_syscall_intern)(p);
-#endif
-       ktremul();
+       emulexec(l, epp);
 
        /* Allow new references from the debugger/procfs. */
        rw_exit(&p->p_reflock);