1/*-
2 * Copyright (c) 1994-1995 S�ren 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 * $Id: imgact_linux.c,v 1.2 1995/08/24 10:32:27 davidg Exp $
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/sysent.h>
43
44#include <vm/vm.h>
45#include <vm/vm_kern.h>
46
47int
48exec_linux_imgact(imgp)
49 struct image_params *imgp;
50{
51 struct exec *a_out = (struct exec *) imgp->image_header;
52 struct vmspace *vmspace = imgp->proc->p_vmspace;
53 unsigned long vmaddr, virtual_offset, file_offset;
54 unsigned long buffer, bss_size;
55 int error;
56 extern struct sysentvec linux_sysvec;
57
58 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
59 return -1;
60
61 /*
62 * Set file/virtual offset based on a.out variant.
63 */
64 switch ((int)(a_out->a_magic & 0xffff)) {
65 case 0413:
66 virtual_offset = 0;
67 file_offset = 1024;
68 break;
69 case 0314:
70 virtual_offset = 4096;
71 file_offset = 0;
72 break;
73 default:
74 return (-1);
75 }
76 bss_size = round_page(a_out->a_bss);
77
78 /*
79 * Check various fields in header for validity/bounds.
80 */
81 if (a_out->a_entry < virtual_offset ||
82 a_out->a_entry >= virtual_offset + a_out->a_text ||
83 a_out->a_text % NBPG || a_out->a_data % NBPG)
84 return (-1);
85
86 /* text + data can't exceed file size */
87 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
88 return (EFAULT);
89 /*
90 * text/data/bss must not exceed limits
91 */
92 if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ ||
93 a_out->a_data+bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
94 return (ENOMEM);
95
96 /* copy in arguments and/or environment from old process */
97 error = exec_extract_strings(imgp);
98 if (error)
99 return (error);
100
101 /*
102 * Destroy old process VM and create a new one (with a new stack)
103 */
104 exec_new_vmspace(imgp);
105
106 /*
107 * Check if file_offset page aligned,.
108 * Currently we cannot handle misalinged file offsets,
109 * and so we read in the entire image (what a waste).
110 */
111 if (file_offset & PGOFSET) {
112#ifdef DEBUG
113 printf("imgact: Non page aligned binary %d\n", file_offset);
114#endif
115 /*
116 * Map text read/execute
117 */
118 vmaddr = virtual_offset;
119 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
120 round_page(a_out->a_text), FALSE);
121 if (error)
122 return error;
123
124 error = vm_mmap(kernel_map, &buffer,
125 round_page(a_out->a_text + file_offset),
126 VM_PROT_READ, VM_PROT_READ, MAP_FILE,
127 (caddr_t) imgp->vp, trunc_page(file_offset));
128 if (error)
129 return error;
130
131 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
132 a_out->a_text);
133 if (error)
134 return error;
135
136 vm_map_remove(kernel_map, trunc_page(vmaddr),
137 round_page(a_out->a_text + file_offset));
138
139 error = vm_map_protect(&vmspace->vm_map, vmaddr,
140 round_page(a_out->a_text),
141 VM_PROT_EXECUTE|VM_PROT_READ, TRUE);
142 if (error)
143 return error;
144 /*
145 * Map data read/write
146 */
147 vmaddr = virtual_offset + a_out->a_text;
148 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
149 round_page(a_out->a_data + bss_size), FALSE);
150 if (error)
151 return error;
152
153 error = vm_mmap(kernel_map, &buffer,
154 round_page(a_out->a_data + file_offset),
155 VM_PROT_READ, VM_PROT_READ, MAP_FILE,
156 (caddr_t) imgp->vp,
157 trunc_page(a_out->a_text + file_offset));
158 if (error)
159 return error;
160
161 error = copyout((caddr_t)(buffer + file_offset),
162 (caddr_t)vmaddr,
163 a_out->a_data);
164 if (error)
165 return error;
166
167 vm_map_remove(kernel_map, trunc_page(vmaddr),
168 round_page(a_out->a_data + file_offset));
169
170 error = vm_map_protect(&vmspace->vm_map, vmaddr,
171 round_page(a_out->a_data + bss_size),
172 VM_PROT_WRITE|VM_PROT_READ, TRUE);
173 if (error)
174 return error;
175 }
176 else {
177#ifdef DEBUG
178 printf("imgact: Page aligned binary %d\n", file_offset);
179#endif
180 /*
181 * Map text read/execute
182 */
183 vmaddr = virtual_offset;
184 error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_text,
185 VM_PROT_READ | VM_PROT_EXECUTE,
186 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE,
187 MAP_PRIVATE | MAP_FIXED,
188 (caddr_t)imgp->vp, file_offset);
189 if (error)
190 return (error);
191
192 /*
193 * Map data read/write
194 */
195 vmaddr = virtual_offset + a_out->a_text;
196 error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_data,
197 VM_PROT_READ | VM_PROT_WRITE,
198 VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
199 (caddr_t)imgp->vp, file_offset + a_out->a_text);
200 if (error)
201 return (error);
202
203 /*
204 * Allocate demand-zeroed area for uninitialized data
205 */
206 if (bss_size != 0) {
207 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
208 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
209 bss_size, FALSE);
210 if (error)
211 return (error);
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 = &linux_sysvec;
227 return (0);
228}
229
230/*
231 * Tell kern_execve.c about it, with a little help from the linker.
232 * Since `const' objects end up in the text segment, TEXT_SET is the
233 * correct directive to use.
234 */
235const struct execsw linux_execsw = { exec_linux_imgact, "linux" };
236TEXT_SET(execsw_set, linux_execsw);
237
2 * Copyright (c) 1994-1995 S�ren 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 * $Id: imgact_linux.c,v 1.2 1995/08/24 10:32:27 davidg Exp $
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/sysent.h>
43
44#include <vm/vm.h>
45#include <vm/vm_kern.h>
46
47int
48exec_linux_imgact(imgp)
49 struct image_params *imgp;
50{
51 struct exec *a_out = (struct exec *) imgp->image_header;
52 struct vmspace *vmspace = imgp->proc->p_vmspace;
53 unsigned long vmaddr, virtual_offset, file_offset;
54 unsigned long buffer, bss_size;
55 int error;
56 extern struct sysentvec linux_sysvec;
57
58 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
59 return -1;
60
61 /*
62 * Set file/virtual offset based on a.out variant.
63 */
64 switch ((int)(a_out->a_magic & 0xffff)) {
65 case 0413:
66 virtual_offset = 0;
67 file_offset = 1024;
68 break;
69 case 0314:
70 virtual_offset = 4096;
71 file_offset = 0;
72 break;
73 default:
74 return (-1);
75 }
76 bss_size = round_page(a_out->a_bss);
77
78 /*
79 * Check various fields in header for validity/bounds.
80 */
81 if (a_out->a_entry < virtual_offset ||
82 a_out->a_entry >= virtual_offset + a_out->a_text ||
83 a_out->a_text % NBPG || a_out->a_data % NBPG)
84 return (-1);
85
86 /* text + data can't exceed file size */
87 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
88 return (EFAULT);
89 /*
90 * text/data/bss must not exceed limits
91 */
92 if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ ||
93 a_out->a_data+bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
94 return (ENOMEM);
95
96 /* copy in arguments and/or environment from old process */
97 error = exec_extract_strings(imgp);
98 if (error)
99 return (error);
100
101 /*
102 * Destroy old process VM and create a new one (with a new stack)
103 */
104 exec_new_vmspace(imgp);
105
106 /*
107 * Check if file_offset page aligned,.
108 * Currently we cannot handle misalinged file offsets,
109 * and so we read in the entire image (what a waste).
110 */
111 if (file_offset & PGOFSET) {
112#ifdef DEBUG
113 printf("imgact: Non page aligned binary %d\n", file_offset);
114#endif
115 /*
116 * Map text read/execute
117 */
118 vmaddr = virtual_offset;
119 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
120 round_page(a_out->a_text), FALSE);
121 if (error)
122 return error;
123
124 error = vm_mmap(kernel_map, &buffer,
125 round_page(a_out->a_text + file_offset),
126 VM_PROT_READ, VM_PROT_READ, MAP_FILE,
127 (caddr_t) imgp->vp, trunc_page(file_offset));
128 if (error)
129 return error;
130
131 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
132 a_out->a_text);
133 if (error)
134 return error;
135
136 vm_map_remove(kernel_map, trunc_page(vmaddr),
137 round_page(a_out->a_text + file_offset));
138
139 error = vm_map_protect(&vmspace->vm_map, vmaddr,
140 round_page(a_out->a_text),
141 VM_PROT_EXECUTE|VM_PROT_READ, TRUE);
142 if (error)
143 return error;
144 /*
145 * Map data read/write
146 */
147 vmaddr = virtual_offset + a_out->a_text;
148 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
149 round_page(a_out->a_data + bss_size), FALSE);
150 if (error)
151 return error;
152
153 error = vm_mmap(kernel_map, &buffer,
154 round_page(a_out->a_data + file_offset),
155 VM_PROT_READ, VM_PROT_READ, MAP_FILE,
156 (caddr_t) imgp->vp,
157 trunc_page(a_out->a_text + file_offset));
158 if (error)
159 return error;
160
161 error = copyout((caddr_t)(buffer + file_offset),
162 (caddr_t)vmaddr,
163 a_out->a_data);
164 if (error)
165 return error;
166
167 vm_map_remove(kernel_map, trunc_page(vmaddr),
168 round_page(a_out->a_data + file_offset));
169
170 error = vm_map_protect(&vmspace->vm_map, vmaddr,
171 round_page(a_out->a_data + bss_size),
172 VM_PROT_WRITE|VM_PROT_READ, TRUE);
173 if (error)
174 return error;
175 }
176 else {
177#ifdef DEBUG
178 printf("imgact: Page aligned binary %d\n", file_offset);
179#endif
180 /*
181 * Map text read/execute
182 */
183 vmaddr = virtual_offset;
184 error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_text,
185 VM_PROT_READ | VM_PROT_EXECUTE,
186 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE,
187 MAP_PRIVATE | MAP_FIXED,
188 (caddr_t)imgp->vp, file_offset);
189 if (error)
190 return (error);
191
192 /*
193 * Map data read/write
194 */
195 vmaddr = virtual_offset + a_out->a_text;
196 error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_data,
197 VM_PROT_READ | VM_PROT_WRITE,
198 VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
199 (caddr_t)imgp->vp, file_offset + a_out->a_text);
200 if (error)
201 return (error);
202
203 /*
204 * Allocate demand-zeroed area for uninitialized data
205 */
206 if (bss_size != 0) {
207 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
208 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
209 bss_size, FALSE);
210 if (error)
211 return (error);
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 = &linux_sysvec;
227 return (0);
228}
229
230/*
231 * Tell kern_execve.c about it, with a little help from the linker.
232 * Since `const' objects end up in the text segment, TEXT_SET is the
233 * correct directive to use.
234 */
235const struct execsw linux_execsw = { exec_linux_imgact, "linux" };
236TEXT_SET(execsw_set, linux_execsw);
237