1/* $NetBSD: compat_exec.c,v 1.17 2009/08/15 23:39:35 matt Exp $ */
2
3/*
4 * Copyright (c) 1993, 1994 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Christopher G. Demetriou.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: compat_exec.c,v 1.17 2009/08/15 23:39:35 matt Exp $");
35
36#ifdef _KERNEL_OPT
37#include "opt_execfmt.h"
38#endif
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/proc.h>
43#include <sys/vnode.h>
44#include <sys/exec.h>
45#include <sys/resourcevar.h>
46
47#ifdef EXEC_AOUT
48#include <sys/exec_aout.h>
49
50/*
51 * exec_aout_prep_oldzmagic():
52 * Prepare the vmcmds to build a vmspace for an old ZMAGIC
53 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
54 *
55 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
56 * description of operation is there.
57 * There were copies of this in the mac68k, hp300, and i386 ports.
58 */
59int
60exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp)
61{
62 struct exec *execp = epp->ep_hdr;
63 int error;
64
65 epp->ep_taddr = 0;
66 epp->ep_tsize = execp->a_text;
67 epp->ep_daddr = epp->ep_taddr + execp->a_text;
68 epp->ep_dsize = execp->a_data + execp->a_bss;
69 epp->ep_entry = execp->a_entry;
70
71 error = vn_marktext(epp->ep_vp);
72 if (error)
73 return (error);
74
75 /* set up command for text segment */
76 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
77 epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */
78 VM_PROT_READ|VM_PROT_EXECUTE);
79
80 /* set up command for data segment */
81 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
82 epp->ep_daddr, epp->ep_vp,
83 execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */
84 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
85
86 /* set up command for bss segment */
87 if (execp->a_bss)
88 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
89 epp->ep_daddr + execp->a_data, NULLVP, 0,
90 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
91
92 return (*epp->ep_esch->es_setup_stack)(l, epp);
93}
94
95
96/*
97 * exec_aout_prep_oldnmagic():
98 * Prepare the vmcmds to build a vmspace for an old NMAGIC
99 * binary. [BSDI]
100 *
101 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
102 * at 0.
103 * XXX: There must be a better way to share this code.
104 */
105int
106exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp)
107{
108 struct exec *execp = epp->ep_hdr;
109 long bsize, baddr;
110
111 epp->ep_taddr = 0;
112 epp->ep_tsize = execp->a_text;
113 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
114 epp->ep_dsize = execp->a_data + execp->a_bss;
115 epp->ep_entry = execp->a_entry;
116
117 /* set up command for text segment */
118 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
119 epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
120 VM_PROT_READ|VM_PROT_EXECUTE);
121
122 /* set up command for data segment */
123 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
124 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
125 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
126
127 /* set up command for bss segment */
128 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
129 bsize = epp->ep_daddr + epp->ep_dsize - baddr;
130 if (bsize > 0)
131 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
132 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
133
134 return (*epp->ep_esch->es_setup_stack)(l, epp);
135}
136
137
138/*
139 * exec_aout_prep_oldomagic():
140 * Prepare the vmcmds to build a vmspace for an old OMAGIC
141 * binary. [BSDI]
142 *
143 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
144 * at 0.
145 * XXX: There must be a better way to share this code.
146 */
147int
148exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp)
149{
150 struct exec *execp = epp->ep_hdr;
151 long dsize, bsize, baddr;
152
153 epp->ep_taddr = 0;
154 epp->ep_tsize = execp->a_text;
155 epp->ep_daddr = epp->ep_taddr + execp->a_text;
156 epp->ep_dsize = execp->a_data + execp->a_bss;
157 epp->ep_entry = execp->a_entry;
158
159 /* set up command for text and data segments */
160 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
161 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
162 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
163
164 /* set up command for bss segment */
165 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
166 bsize = epp->ep_daddr + epp->ep_dsize - baddr;
167 if (bsize > 0)
168 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
169 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
170
171 /*
172 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
173 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
174 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
175 * respectively to page boundaries.
176 * Compensate `ep_dsize' for the amount of data covered by the last
177 * text page.
178 */
179 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
180 PAGE_SIZE);
181 epp->ep_dsize = (dsize > 0) ? dsize : 0;
182 return (*epp->ep_esch->es_setup_stack)(l, epp);
183}
184#endif /* EXEC_AOUT */
185