1 /* $NetBSD: m68k4k_exec.c,v 1.19 2007/12/08 18:36:13 dsl 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 /*
34 * Exec glue to provide compatibility with older NetBSD m68k4k exectuables.
35 *
36 * Taken directly from kern/exec_aout.c and frobbed to map text and
37 * data as m68k4k executables expect.
38 *
39 * This module only works on machines with PAGE_SIZE == 4096. It's not clear
40 * that making it work on other machines is worth the trouble.
41 */
42
43 #include <sys/cdefs.h>
44 __KERNEL_RCSID(0, "$NetBSD: m68k4k_exec.c,v 1.19 2007/12/08 18:36:13 dsl Exp $");
45
46 #if !defined(__m68k__)
47 #error YOU GOTTA BE KIDDING!
48 #endif
49
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/proc.h>
53 #include <sys/malloc.h>
54 #include <sys/vnode.h>
55 #include <sys/exec.h>
56 #include <sys/resourcevar.h>
57
58 #include <compat/m68k4k/m68k4k_exec.h>
59
60 int exec_m68k4k_prep_zmagic(struct lwp *, struct exec_package *);
61 int exec_m68k4k_prep_nmagic(struct lwp *, struct exec_package *);
62 int exec_m68k4k_prep_omagic(struct lwp *, struct exec_package *);
63
64 /*
65 * exec_m68k4k_makecmds(): Check if it's an a.out-format executable
66 * with an m68k4k magic number.
67 *
68 * Given a proc pointer and an exec package pointer, see if the referent
69 * of the epp is in a.out format. Just check 'standard' magic numbers for
70 * this architecture.
71 *
72 * This function, in the former case, or the hook, in the latter, is
73 * responsible for creating a set of vmcmds which can be used to build
74 * the process's vm space and inserting them into the exec package.
75 */
76
77 int
78 exec_m68k4k_makecmds(struct lwp *l, struct exec_package *epp)
79 {
80 u_long midmag, magic;
81 u_short mid;
82 int error;
83 struct exec *execp = epp->ep_hdr;
84
85 /* See note above... */
86 if (M68K4K_LDPGSZ != PAGE_SIZE)
87 return ENOEXEC;
88
89 if (epp->ep_hdrvalid < sizeof(struct exec))
90 return ENOEXEC;
91
92 midmag = ntohl(execp->a_midmag);
93 mid = (midmag >> 16) & 0x3ff;
94 magic = midmag & 0xffff;
95
96 midmag = mid << 16 | magic;
97
98 switch (midmag) {
99 case (MID_M68K4K << 16) | ZMAGIC:
100 error = exec_m68k4k_prep_zmagic(l, epp);
101 break;
102 case (MID_M68K4K << 16) | NMAGIC:
103 error = exec_m68k4k_prep_nmagic(l, epp);
104 break;
105 case (MID_M68K4K << 16) | OMAGIC:
106 error = exec_m68k4k_prep_omagic(l, epp);
107 break;
108 default:
109 error = ENOEXEC;
110 }
111
112 if (error)
113 kill_vmcmds(&epp->ep_vmcmds);
114
115 return error;
116 }
117
118 /*
119 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package
120 *
121 * First, set of the various offsets/lengths in the exec package.
122 *
123 * Then, mark the text image busy (so it can be demand paged) or error
124 * out if this is not possible. Finally, set up vmcmds for the
125 * text, data, bss, and stack segments.
126 */
127
128 int
129 exec_m68k4k_prep_zmagic(struct lwp *l, struct exec_package *epp)
130 {
131 struct exec *execp = epp->ep_hdr;
132 int error;
133
134 epp->ep_taddr = M68K4K_USRTEXT;
135 epp->ep_tsize = execp->a_text;
136 epp->ep_daddr = epp->ep_taddr + execp->a_text;
137 epp->ep_dsize = execp->a_data + execp->a_bss;
138 epp->ep_entry = execp->a_entry;
139
140 error = vn_marktext(epp->ep_vp);
141 if (error)
142 return (error);
143
144 /* set up command for text segment */
145 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
146 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
147
148 /* set up command for data segment */
149 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
150 epp->ep_daddr, epp->ep_vp, execp->a_text,
151 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
152
153 /* set up command for bss segment */
154 if (execp->a_bss)
155 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
156 epp->ep_daddr + execp->a_data, NULLVP, 0,
157 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
158
159 return (*epp->ep_esch->es_setup_stack)(l, epp);
160 }
161
162 /*
163 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package
164 */
165
166 int
167 exec_m68k4k_prep_nmagic(struct lwp *l, struct exec_package *epp)
168 {
169 struct exec *execp = epp->ep_hdr;
170 long bsize, baddr;
171
172 epp->ep_taddr = M68K4K_USRTEXT;
173 epp->ep_tsize = execp->a_text;
174 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text,
175 M68K4K_LDPGSZ);
176 epp->ep_dsize = execp->a_data + execp->a_bss;
177 epp->ep_entry = execp->a_entry;
178
179 /* set up command for text segment */
180 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
181 epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
182 VM_PROT_READ|VM_PROT_EXECUTE);
183
184 /* set up command for data segment */
185 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
186 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
187 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
188
189 /* set up command for bss segment */
190 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
191 bsize = epp->ep_daddr + epp->ep_dsize - baddr;
192 if (bsize > 0)
193 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
194 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
195
196 return (*epp->ep_esch->es_setup_stack)(l, epp);
197 }
198
199 /*
200 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package
201 */
202
203 int
204 exec_m68k4k_prep_omagic(struct lwp *l, struct exec_package *epp)
205 {
206 struct exec *execp = epp->ep_hdr;
207 long dsize, bsize, baddr;
208
209 epp->ep_taddr = M68K4K_USRTEXT;
210 epp->ep_tsize = execp->a_text;
211 epp->ep_daddr = epp->ep_taddr + execp->a_text;
212 epp->ep_dsize = execp->a_data + execp->a_bss;
213 epp->ep_entry = execp->a_entry;
214
215 /* set up command for text and data segments */
216 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
217 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
218 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
219
220 /* set up command for bss segment */
221 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
222 bsize = epp->ep_daddr + epp->ep_dsize - baddr;
223 if (bsize > 0)
224 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
225 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
226
227 /*
228 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
229 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
230 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
231 * respectively to page boundaries.
232 * Compensate `ep_dsize' for the amount of data covered by the last
233 * text page.
234 */
235 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
236 PAGE_SIZE);
237 epp->ep_dsize = (dsize > 0) ? dsize : 0;
238 return (*epp->ep_esch->es_setup_stack)(l, epp);
239 }
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