1 /*-
2 * Copyright (c) 1994-1996 Søren Schmidt
3 * All rights reserved.
4 *
5 * Based heavily on /sys/kern/imgact_aout.c which is:
6 * Copyright (c) 1993, David Greenman
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 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software withough specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $FreeBSD$
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/resourcevar.h>
37 #include <sys/exec.h>
38 #include <sys/mman.h>
39 #include <sys/imgact.h>
40 #include <sys/imgact_aout.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/proc.h>
44 #include <sys/vnode.h>
45
46 #include <vm/vm.h>
47 #include <vm/vm_kern.h>
48 #include <vm/vm_param.h>
49 #include <vm/pmap.h>
50 #include <vm/vm_map.h>
51 #include <vm/vm_prot.h>
52 #include <vm/vm_extern.h>
53
54 #include <i386/linux/linux.h>
55
56 static int exec_linux_imgact __P((struct image_params *iparams));
57
58 static int
59 exec_linux_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: %08lx, data: %08lx, bss: %08lx\n",
91 (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
92 #endif
93
94 /*
95 * Check various fields in header for validity/bounds.
96 */
97 if (a_out->a_entry < virtual_offset ||
98 a_out->a_entry >= virtual_offset + a_out->a_text ||
99 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
100 return (-1);
101
102 /* text + data can't exceed file size */
103 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
104 return (EFAULT);
105 /*
106 * text/data/bss must not exceed limits
107 */
108 if (a_out->a_text > MAXTSIZ ||
109 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
110 return (ENOMEM);
111
112 /* copy in arguments and/or environment from old process */
113 error = exec_extract_strings(imgp);
114 if (error)
115 return (error);
116
117 /*
118 * Destroy old process VM and create a new one (with a new stack)
119 */
120 exec_new_vmspace(imgp);
121 vmspace = imgp->proc->p_vmspace;
122
123 /*
124 * Check if file_offset page aligned,.
125 * Currently we cannot handle misalinged file offsets,
126 * and so we read in the entire image (what a waste).
127 */
128 if (file_offset & PAGE_MASK) {
129 #ifdef DEBUG
130 printf("imgact: Non page aligned binary %lu\n", file_offset);
131 #endif
132 /*
133 * Map text+data+bss read/write/execute
134 */
135 vmaddr = virtual_offset;
136 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
137 a_out->a_text + a_out->a_data + bss_size, FALSE,
138 VM_PROT_ALL, VM_PROT_ALL, 0);
139 if (error)
140 return error;
141
142 error = vm_mmap(kernel_map, &buffer,
143 round_page(a_out->a_text + a_out->a_data + file_offset),
144 VM_PROT_READ, VM_PROT_READ, 0,
145 (caddr_t) imgp->vp, trunc_page(file_offset));
146 if (error)
147 return error;
148
149 error = copyout((caddr_t)(void *)(uintptr_t)(buffer + file_offset),
150 (caddr_t)vmaddr, a_out->a_text + a_out->a_data);
151
152 vm_map_remove(kernel_map, buffer,
153 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
154
155 if (error)
156 return error;
157
158 /*
159 * remove write enable on the 'text' part
160 */
161 error = vm_map_protect(&vmspace->vm_map,
162 vmaddr,
163 vmaddr + a_out->a_text,
164 VM_PROT_EXECUTE|VM_PROT_READ,
165 TRUE);
166 if (error)
167 return error;
168 }
169 else {
170 #ifdef DEBUG
171 printf("imgact: Page aligned binary %lu\n", file_offset);
172 #endif
173 /*
174 * Map text+data read/execute
175 */
176 vmaddr = virtual_offset;
177 error = vm_mmap(&vmspace->vm_map, &vmaddr,
178 a_out->a_text + a_out->a_data,
179 VM_PROT_READ | VM_PROT_EXECUTE,
180 VM_PROT_ALL,
181 MAP_PRIVATE | MAP_FIXED,
182 (caddr_t)imgp->vp, file_offset);
183 if (error)
184 return (error);
185
186 #ifdef DEBUG
187 printf("imgact: startaddr=%08lx, length=%08lx\n",
188 (u_long)vmaddr, a_out->a_text + a_out->a_data);
189 #endif
190 /*
191 * allow read/write of data
192 */
193 error = vm_map_protect(&vmspace->vm_map,
194 vmaddr + a_out->a_text,
195 vmaddr + a_out->a_text + a_out->a_data,
196 VM_PROT_ALL,
197 FALSE);
198 if (error)
199 return (error);
200
201 /*
202 * Allocate anon demand-zeroed area for uninitialized data
203 */
204 if (bss_size != 0) {
205 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
206 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
207 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
208 if (error)
209 return (error);
210 #ifdef DEBUG
211 printf("imgact: bssaddr=%08lx, length=%08lx\n",
212 (u_long)vmaddr, bss_size);
213 #endif
214
215 }
216 /* Indicate that this file should not be modified */
217 imgp->vp->v_flag |= VTEXT;
218 }
219 /* Fill in process VM information */
220 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
221 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
222 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
223 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
224 (virtual_offset + a_out->a_text);
225
226 /* Fill in image_params */
227 imgp->interpreted = 0;
228 imgp->entry_addr = a_out->a_entry;
229
230 imgp->proc->p_sysent = &linux_sysvec;
231 return (0);
232 }
233
234 /*
235 * Tell kern_execve.c about it, with a little help from the linker.
236 * Since `const' objects end up in the text segment, TEXT_SET is the
237 * correct directive to use.
238 */
239 static const struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
240 EXEC_SET(linuxaout, linux_execsw);
241
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