1 /* $NetBSD: exec_ecoff.c,v 1.31 2014/03/07 01:34:29 christos Exp $ */
2
3 /*
4 * Copyright (c) 1994 Adam Glass
5 * Copyright (c) 1993, 1994, 1996, 1999 Christopher G. Demetriou
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Christopher G. Demetriou
19 * for the NetBSD Project.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.31 2014/03/07 01:34:29 christos Exp $");
37
38 #ifdef _KERNEL_OPT
39 #include "opt_coredump.h"
40 #endif
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/proc.h>
45 #include <sys/vnode.h>
46 #include <sys/exec.h>
47 #include <sys/resourcevar.h>
48 #include <sys/module.h>
49 #include <sys/exec.h>
50 #include <sys/exec_ecoff.h>
51
52 #ifdef COREDUMP
53 #define DEP "coredump"
54 #else
55 #define DEP NULL
56 #endif
57
58 MODULE(MODULE_CLASS_EXEC, exec_ecoff, DEP)
59
60 static struct execsw exec_ecoff_execsw = {
61 .es_hdrsz = ECOFF_HDR_SIZE,
62 .es_makecmds = exec_ecoff_makecmds,
63 .u = {
64 .ecoff_probe_func = cpu_exec_ecoff_probe,
65 },
66 .es_emul = &emul_netbsd,
67 .es_prio = EXECSW_PRIO_ANY,
68 .es_arglen = 0,
69 .es_copyargs = copyargs,
70 .es_setregs = cpu_exec_ecoff_setregs,
71 .es_coredump = coredump_netbsd,
72 .es_setup_stack = exec_setup_stack,
73 };
74
75 static int
exec_ecoff_modcmd(modcmd_t cmd,void * arg)76 exec_ecoff_modcmd(modcmd_t cmd, void *arg)
77 {
78 switch (cmd) {
79 case MODULE_CMD_INIT:
80 return exec_add(&exec_ecoff_execsw, 1);
81
82 case MODULE_CMD_FINI:
83 return exec_remove(&exec_ecoff_execsw, 1);
84
85 default:
86 return ENOTTY;
87 }
88 }
89
90 /*
91 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable.
92 *
93 * Given a proc pointer and an exec package pointer, see if the referent
94 * of the epp is in ecoff format. Check 'standard' magic numbers for
95 * this architecture. If that fails, return failure.
96 *
97 * This function is responsible for creating a set of vmcmds which can be
98 * used to build the process's vm space and inserting them into the exec
99 * package.
100 */
101 int
exec_ecoff_makecmds(struct lwp * l,struct exec_package * epp)102 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp)
103 {
104 int error;
105 struct ecoff_exechdr *execp = epp->ep_hdr;
106
107 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE)
108 return ENOEXEC;
109
110 if (ECOFF_BADMAG(execp))
111 return ENOEXEC;
112
113 error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp);
114
115 /*
116 * if there was an error or there are already vmcmds set up,
117 * we return. (the latter can happen if cpu_exec_ecoff_hook()
118 * recursively invokes check_exec() to handle loading of a
119 * dynamically linked binary's shared loader.
120 */
121 if (error || epp->ep_vmcmds.evs_cnt)
122 return (error);
123
124 /*
125 * prepare the exec package to map the executable.
126 */
127 switch (execp->a.magic) {
128 case ECOFF_OMAGIC:
129 error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr,
130 epp->ep_vp);
131 break;
132 case ECOFF_NMAGIC:
133 error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr,
134 epp->ep_vp);
135 break;
136 case ECOFF_ZMAGIC:
137 error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr,
138 epp->ep_vp);
139 break;
140 default:
141 return ENOEXEC;
142 }
143
144 /* set up the stack */
145 if (!error)
146 error = (*epp->ep_esch->es_setup_stack)(l, epp);
147
148 if (error)
149 kill_vmcmds(&epp->ep_vmcmds);
150
151 return error;
152 }
153
154 /*
155 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package
156 */
157 int
exec_ecoff_prep_omagic(struct lwp * l,struct exec_package * epp,struct ecoff_exechdr * execp,struct vnode * vp)158 exec_ecoff_prep_omagic(struct lwp *l, struct exec_package *epp,
159 struct ecoff_exechdr *execp, struct vnode *vp)
160 {
161 struct ecoff_aouthdr *eap = &execp->a;
162
163 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
164 epp->ep_tsize = eap->tsize;
165 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
166 epp->ep_dsize = eap->dsize + eap->bsize;
167 epp->ep_entry = eap->entry;
168
169 /* set up command for text and data segments */
170 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
171 eap->tsize + eap->dsize, epp->ep_taddr, vp,
172 ECOFF_TXTOFF(execp),
173 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
174
175 /* set up command for bss segment */
176 if (eap->bsize > 0)
177 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
178 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
179 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
180
181 return 0;
182 }
183
184 /*
185 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec
186 * package.
187 */
188 int
exec_ecoff_prep_nmagic(struct lwp * l,struct exec_package * epp,struct ecoff_exechdr * execp,struct vnode * vp)189 exec_ecoff_prep_nmagic(struct lwp *l, struct exec_package *epp,
190 struct ecoff_exechdr *execp, struct vnode *vp)
191 {
192 struct ecoff_aouthdr *eap = &execp->a;
193
194 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
195 epp->ep_tsize = eap->tsize;
196 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ);
197 epp->ep_dsize = eap->dsize + eap->bsize;
198 epp->ep_entry = eap->entry;
199
200 /* set up command for text segment */
201 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize,
202 epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
203 VM_PROT_READ|VM_PROT_EXECUTE);
204
205 /* set up command for data segment */
206 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize,
207 epp->ep_daddr, vp, ECOFF_DATOFF(execp),
208 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
209
210 /* set up command for bss segment */
211 if (eap->bsize > 0)
212 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
213 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
214 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
215
216 return 0;
217 }
218
219 /*
220 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package
221 *
222 * First, set the various offsets/lengths in the exec package.
223 *
224 * Then, mark the text image busy (so it can be demand paged) or error
225 * out if this is not possible. Finally, set up vmcmds for the
226 * text, data, bss, and stack segments.
227 */
228 int
exec_ecoff_prep_zmagic(struct lwp * l,struct exec_package * epp,struct ecoff_exechdr * execp,struct vnode * vp)229 exec_ecoff_prep_zmagic(struct lwp *l, struct exec_package *epp,
230 struct ecoff_exechdr *execp, struct vnode *vp)
231 {
232 struct ecoff_aouthdr *eap = &execp->a;
233 int error;
234
235 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
236 epp->ep_tsize = eap->tsize;
237 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
238 epp->ep_dsize = eap->dsize + eap->bsize;
239 epp->ep_entry = eap->entry;
240
241 error = vn_marktext(vp);
242 if (error)
243 return (error);
244
245 /* set up command for text segment */
246 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize,
247 epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
248 VM_PROT_READ|VM_PROT_EXECUTE);
249
250 /* set up command for data segment */
251 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize,
252 epp->ep_daddr, vp, ECOFF_DATOFF(execp),
253 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
254
255 /* set up command for bss segment */
256 if (eap->bsize > 0)
257 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
258 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
259 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
260
261 return 0;
262 }
263