2 * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $DragonFly: src/sys/kern/imgact_resident.c,v 1.2 2004/01/20 21:03:23 dillon Exp $
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/sysproto.h>
34 #include <sys/imgact.h>
35 #include <sys/imgact_aout.h>
38 #include <sys/resourcevar.h>
39 #include <sys/sysent.h>
40 #include <sys/systm.h>
41 #include <sys/vnode.h>
42 #include <sys/inflate.h>
45 #include <vm/vm_param.h>
48 #include <vm/vm_map.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_extern.h>
53 exec_resident_imgact(struct image_params *imgp)
55 struct vmresident *vmres;
58 * resident image activator
60 if ((vmres = imgp->vp->v_resident) == NULL)
62 exec_new_vmspace(imgp, vmres->vr_vmspace);
64 imgp->interpreted = 0;
65 imgp->proc->p_sysent = vmres->vr_sysent;
66 imgp->entry_addr = vmres->vr_entry_addr;
70 static int exec_res_id;
71 static TAILQ_HEAD(,vmresident) exec_res_list = TAILQ_HEAD_INITIALIZER(exec_res_list);
73 static MALLOC_DEFINE(M_EXEC_RES, "vmresident", "resident execs");
76 * exec_sys_register(entry)
78 * Register ourselves for resident execution. Only root can do this. This
79 * will snapshot the vmspace and cause future exec's of the specified binary
80 * to use the snapshot directly rather then load & relocate a new copy.
83 exec_sys_register(struct exec_sys_register_args *uap)
85 struct vmresident *vmres;
91 if ((error = suser(p->p_thread)) != 0)
93 if ((vp = p->p_textvp) == NULL)
98 vmres = malloc(sizeof(*vmres), M_EXEC_RES, M_WAITOK);
99 vp->v_resident = vmres;
100 vmres->vr_vnode = vp;
101 vmres->vr_sysent = p->p_sysent;
102 vmres->vr_id = ++exec_res_id;
103 vmres->vr_entry_addr = (intptr_t)uap->entry;
104 vmres->vr_vmspace = vmspace_fork(p->p_vmspace); /* XXX order */
105 TAILQ_INSERT_TAIL(&exec_res_list, vmres, vr_link);
110 * exec_sys_unregister(id)
112 * Unregister the specified id. If an id of -1 is used unregister
113 * the registration associated with the current process. An id of -2
114 * unregisters everything.
117 exec_sys_unregister(struct exec_sys_unregister_args *uap)
119 struct vmresident *vmres;
126 if ((error = suser(p->p_thread)) != 0)
130 * If id is -1, unregister ourselves
132 if ((id = uap->id) == -1 && p->p_textvp && p->p_textvp->v_resident)
133 id = p->p_textvp->v_resident->vr_id;
136 * Look for the registration
141 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
142 if (id == -2 || vmres->vr_id == id) {
143 TAILQ_REMOVE(&exec_res_list, vmres, vr_link);
144 if (vmres->vr_vnode) {
145 vmres->vr_vnode->v_resident = NULL;
146 vdrop(vmres->vr_vnode);
147 vmres->vr_vnode = NULL;
149 if (vmres->vr_vmspace) {
150 vmspace_free(vmres->vr_vmspace);
151 vmres->vr_vmspace = NULL;
153 free(vmres, M_EXEC_RES);
160 uap->sysmsg_result = count;