1 /*-
2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994-1996 Søren Schmidt
4 * All rights reserved.
5 *
6 * Based heavily on /sys/kern/imgact_aout.c which is:
7 * Copyright (c) 1993, David Greenman
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer
14 * in this position and unchanged.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software withough 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 * $FreeBSD$
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/resourcevar.h>
38 #include <sys/exec.h>
39 #include <sys/mman.h>
40 #include <sys/imgact.h>
41 #include <sys/imgact_aout.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/proc.h>
45 #include <sys/vnode.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_kern.h>
49 #include <vm/vm_param.h>
50 #include <vm/pmap.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_extern.h>
53
54 #include <svr4/svr4.h>
55
56 static int exec_svr4_imgact __P((struct image_params *iparams));
57
58 static int
59 exec_svr4_imgact(imgp)
60 struct image_params *imgp;
61 {
62 const struct exec *a_out = (const struct exec *) imgp->image_header;
63 struct vmspace *vmspace;
64 vm_offset_t vmaddr;
65 unsigned long virtual_offset, file_offset;
66 vm_offset_t buffer;
67 unsigned long bss_size;
68 int error;
69
70 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
71 return -1;
72
73 /*
74 * Set file/virtual offset based on a.out variant.
75 */
76 switch ((int)(a_out->a_magic & 0xffff)) {
77 case 0413:
78 virtual_offset = 0;
79 file_offset = 1024;
80 break;
81 case 0314:
82 virtual_offset = 4096;
83 file_offset = 0;
84 break;
85 default:
86 return (-1);
87 }
88 bss_size = round_page(a_out->a_bss);
89 #ifdef DEBUG
90 printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size);
91 #endif
92
93 /*
94 * Check various fields in header for validity/bounds.
95 */
96 if (a_out->a_entry < virtual_offset ||
97 a_out->a_entry >= virtual_offset + a_out->a_text ||
98 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
99 return (-1);
100
101 /* text + data can't exceed file size */
102 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
103 return (EFAULT);
104 /*
105 * text/data/bss must not exceed limits
106 */
107 if (a_out->a_text > maxtsiz ||
108 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
109 return (ENOMEM);
110
111 /* copy in arguments and/or environment from old process */
112 error = exec_extract_strings(imgp);
113 if (error)
114 return (error);
115
116 /*
117 * Destroy old process VM and create a new one (with a new stack)
118 */
119 exec_new_vmspace(imgp);
120 vmspace = imgp->proc->p_vmspace;
121
122 /*
123 * Check if file_offset page aligned,.
124 * Currently we cannot handle misalinged file offsets,
125 * and so we read in the entire image (what a waste).
126 */
127 if (file_offset & PAGE_MASK) {
128 #ifdef DEBUG
129 printf("imgact: Non page aligned binary %d\n", file_offset);
130 #endif
131 /*
132 * Map text+data+bss read/write/execute
133 */
134 vmaddr = virtual_offset;
135 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
136 a_out->a_text + a_out->a_data + bss_size, FALSE,
137 VM_PROT_ALL, VM_PROT_ALL, 0);
138 if (error)
139 return error;
140
141 error = vm_mmap(kernel_map, &buffer,
142 round_page(a_out->a_text + a_out->a_data + file_offset),
143 VM_PROT_READ, VM_PROT_READ, 0,
144 (caddr_t) imgp->vp, trunc_page(file_offset));
145 if (error)
146 return error;
147
148 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
149 a_out->a_text + a_out->a_data);
150
151 vm_map_remove(kernel_map, buffer,
152 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
153
154 if (error)
155 return error;
156
157 /*
158 * remove write enable on the 'text' part
159 */
160 error = vm_map_protect(&vmspace->vm_map,
161 vmaddr,
162 vmaddr + a_out->a_text,
163 VM_PROT_EXECUTE|VM_PROT_READ,
164 TRUE);
165 if (error)
166 return error;
167 }
168 else {
169 #ifdef DEBUG
170 printf("imgact: Page aligned binary %d\n", file_offset);
171 #endif
172 /*
173 * Map text+data read/execute
174 */
175 vmaddr = virtual_offset;
176 error = vm_mmap(&vmspace->vm_map, &vmaddr,
177 a_out->a_text + a_out->a_data,
178 VM_PROT_READ | VM_PROT_EXECUTE,
179 VM_PROT_ALL,
180 MAP_PRIVATE | MAP_FIXED,
181 (caddr_t)imgp->vp, file_offset);
182 if (error)
183 return (error);
184
185 #ifdef DEBUG
186 printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data);
187 #endif
188 /*
189 * allow read/write of data
190 */
191 error = vm_map_protect(&vmspace->vm_map,
192 vmaddr + a_out->a_text,
193 vmaddr + a_out->a_text + a_out->a_data,
194 VM_PROT_ALL,
195 FALSE);
196 if (error)
197 return (error);
198
199 /*
200 * Allocate anon demand-zeroed area for uninitialized data
201 */
202 if (bss_size != 0) {
203 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
204 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
205 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
206 if (error)
207 return (error);
208 #ifdef DEBUG
209 printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size);
210 #endif
211
212 }
213 /* Indicate that this file should not be modified */
214 imgp->vp->v_flag |= VTEXT;
215 }
216 /* Fill in process VM information */
217 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
218 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
219 vmspace->vm_taddr = (caddr_t)virtual_offset;
220 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
221
222 /* Fill in image_params */
223 imgp->interpreted = 0;
224 imgp->entry_addr = a_out->a_entry;
225
226 imgp->proc->p_sysent = &svr4_sysvec;
227 return (0);
228 }
229
230 /*
231 * Tell kern_execve.c about it, with a little help from the linker.
232 */
233 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
234 EXEC_SET(execsw_set, svr4_execsw);
235
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