[src/trunk]: src/sys/kern execve_runproc: Isolate new stack arg filling code ...

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

details:   https://anonhg.NetBSD.org/src/rev/51cdde8a78a7
branches:  trunk
changeset: 795492:51cdde8a78a7
user:      uebayasi <uebayasi%NetBSD.org@localhost>
date:      Tue Apr 15 17:06:21 2014 +0000

description:
execve_runproc: Isolate new stack arg filling code into a function.

diffstat:

 sys/kern/kern_exec.c |  77 +++++++++++++++++++++++++++++++--------------------
 1 files changed, 46 insertions(+), 31 deletions(-)

diffs (121 lines):

diff -r dd802a2cf85a -r 51cdde8a78a7 sys/kern/kern_exec.c
--- a/sys/kern/kern_exec.c      Tue Apr 15 16:44:57 2014 +0000
+++ b/sys/kern/kern_exec.c      Tue Apr 15 17:06:21 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_exec.c,v 1.398 2014/04/15 16:44:57 uebayasi Exp $ */
+/*     $NetBSD: kern_exec.c,v 1.399 2014/04/15 17:06:21 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 1.398 2014/04/15 16:44:57 uebayasi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.399 2014/04/15 17:06:21 uebayasi Exp $");
 
 #include "opt_exec.h"
 #include "opt_execfmt.h"
@@ -124,6 +124,8 @@
 
 static size_t calcargs(struct execve_data * restrict, const size_t);
 static size_t calcstack(struct execve_data * restrict, const size_t);
+static int copyoutargs(struct execve_data * restrict, struct lwp *,
+    char * const);
 static int copyoutpsstrs(struct execve_data * restrict, struct proc *);
 static int copyinargs(struct execve_data * restrict, char * const *,
     char * const *, execve_fetch_element_t, char **);
@@ -1055,35 +1057,9 @@
                PNBUF_PUT(path);
        }
 
-       /* remember information about the process */
-       data->ed_arginfo.ps_nargvstr = data->ed_argc;
-       data->ed_arginfo.ps_nenvstr = data->ed_envc;
-
-       /*
-        * Allocate the stack address passed to the newly execve()'ed process.
-        *
-        * The new stack address will be set to the SP (stack pointer) register
-        * in setregs().
-        */
-
        char * const newstack = STACK_GROW(vm->vm_minsaddr, epp->ep_ssize);
 
-       char *newargs = STACK_ALLOC(
-           STACK_SHRINK(newstack, data->ed_argslen), data->ed_argslen);
-
-       error = (*epp->ep_esch->es_copyargs)(l, epp,
-           &data->ed_arginfo, &newargs, data->ed_argp);
-
-       if (epp->ep_path) {
-               PNBUF_PUT(epp->ep_path);
-               epp->ep_path = NULL;
-       }
-       if (error) {
-               DPRINTF(("%s: copyargs failed %d\n", __func__, error));
-               goto exec_abort;
-       }
-
-       error = copyoutpsstrs(data, p);
+       error = copyoutargs(data, l, newstack);
        if (error != 0)
                goto exec_abort;
 
@@ -1381,6 +1357,47 @@
 }
 
 static int
+copyoutargs(struct execve_data * restrict data, struct lwp *l,
+    char * const newstack)
+{
+       struct exec_package     * const epp = &data->ed_pack;
+       struct proc             *p = l->l_proc;
+       int                     error;
+
+       /* remember information about the process */
+       data->ed_arginfo.ps_nargvstr = data->ed_argc;
+       data->ed_arginfo.ps_nenvstr = data->ed_envc;
+
+       /*
+        * Allocate the stack address passed to the newly execve()'ed process.
+        *
+        * The new stack address will be set to the SP (stack pointer) register
+        * in setregs().
+        */
+
+       char *newargs = STACK_ALLOC(
+           STACK_SHRINK(newstack, data->ed_argslen), data->ed_argslen);
+
+       error = (*epp->ep_esch->es_copyargs)(l, epp,
+           &data->ed_arginfo, &newargs, data->ed_argp);
+
+       if (epp->ep_path) {
+               PNBUF_PUT(epp->ep_path);
+               epp->ep_path = NULL;
+       }
+       if (error) {
+               DPRINTF(("%s: copyargs failed %d\n", __func__, error));
+               return error;
+       }
+
+       error = copyoutpsstrs(data, p);
+       if (error != 0)
+               return error;
+
+       return 0;
+}
+
+static int
 copyoutpsstrs(struct execve_data * restrict data, struct proc *p)
 {
        struct exec_package     * const epp = &data->ed_pack;
@@ -1531,8 +1548,6 @@
 /*
  * Copy argv and env strings from kernel buffer (argp) to the new stack.
  * Those strings are located just after auxinfo.
- *
- * XXX rename this as copyoutargs()
  */
 int
 copyargs(struct lwp *l, struct exec_package *pack, struct ps_strings *arginfo,