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317350b1 DG |
1 | /* |
2 | * Copyright (c) 1993, David Greenman | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by David Greenman | |
16 | * 4. The name of the developer may be used to endorse or promote products | |
17 | * derived from this software without specific prior written permission. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
29 | * SUCH DAMAGE. | |
30 | * | |
fde1aeb2 | 31 | * $Id: aout_imgact.c,v 1.1 1993/12/12 12:23:18 davidg Exp $ |
317350b1 DG |
32 | */ |
33 | ||
34 | #include "param.h" | |
35 | #include "systm.h" | |
36 | #include "resourcevar.h" | |
37 | #include "exec.h" | |
38 | #include "mman.h" | |
39 | #include "imgact.h" | |
40 | ||
41 | #include "vm/vm.h" | |
42 | ||
43 | int | |
44 | exec_aout_imgact(iparams) | |
45 | struct image_params *iparams; | |
46 | { | |
47 | struct exec *a_out = (struct exec *) iparams->image_header; | |
48 | struct vmspace *vmspace = iparams->proc->p_vmspace; | |
49 | unsigned long vmaddr, virtual_offset, file_offset; | |
50 | unsigned long bss_size; | |
51 | int error, len; | |
52 | ||
53 | /* | |
54 | * Set file/virtual offset based on a.out variant. | |
55 | * We do two cases: host byte order and network byte order | |
56 | * (for NetBSD compatibility) | |
57 | */ | |
fde1aeb2 | 58 | switch ((int)(a_out->a_magic & 0xffff)) { |
317350b1 DG |
59 | case ZMAGIC: |
60 | virtual_offset = 0; | |
61 | if (a_out->a_text) { | |
62 | file_offset = NBPG; | |
63 | } else { | |
64 | /* Bill's "screwball mode" */ | |
65 | file_offset = 0; | |
66 | } | |
67 | break; | |
68 | case QMAGIC: | |
69 | virtual_offset = NBPG; | |
70 | file_offset = 0; | |
71 | break; | |
72 | default: | |
73 | /* NetBSD compatibility */ | |
fde1aeb2 | 74 | switch ((int)(ntohl(a_out->a_magic) & 0xffff)) { |
317350b1 DG |
75 | case ZMAGIC: |
76 | case QMAGIC: | |
77 | virtual_offset = NBPG; | |
78 | file_offset = 0; | |
79 | break; | |
80 | default: | |
81 | return (-1); | |
82 | } | |
83 | } | |
84 | ||
85 | bss_size = roundup(a_out->a_bss, NBPG); | |
86 | ||
87 | /* | |
88 | * Check various fields in header for validity/bounds. | |
89 | */ | |
90 | if (/* entry point must lay with text region */ | |
91 | a_out->a_entry < virtual_offset || | |
92 | a_out->a_entry >= virtual_offset + a_out->a_text || | |
93 | ||
94 | /* text and data size must each be page rounded */ | |
95 | a_out->a_text % NBPG || | |
96 | a_out->a_data % NBPG) | |
97 | return (-1); | |
98 | ||
99 | /* text + data can't exceed file size */ | |
100 | if (a_out->a_data + a_out->a_text > iparams->attr->va_size) | |
101 | return (EFAULT); | |
102 | ||
103 | /* | |
104 | * text/data/bss must not exceed limits | |
105 | */ | |
106 | if (/* text can't exceed maximum text size */ | |
107 | a_out->a_text > MAXTSIZ || | |
108 | ||
109 | /* data + bss can't exceed maximum data size */ | |
110 | a_out->a_data + bss_size > MAXDSIZ || | |
111 | ||
112 | /* data + bss can't exceed rlimit */ | |
113 | a_out->a_data + bss_size > | |
114 | iparams->proc->p_rlimit[RLIMIT_DATA].rlim_cur) | |
115 | return (ENOMEM); | |
116 | ||
117 | /* copy in arguments and/or environment from old process */ | |
118 | error = exec_extract_strings(iparams); | |
119 | if (error) | |
120 | return (error); | |
121 | ||
122 | /* | |
123 | * Destroy old process VM and create a new one (with a new stack) | |
124 | */ | |
125 | exec_new_vmspace(iparams); | |
126 | ||
127 | /* | |
128 | * Map text read/execute | |
129 | */ | |
130 | vmaddr = virtual_offset; | |
131 | error = | |
132 | vm_mmap(&vmspace->vm_map, /* map */ | |
133 | &vmaddr, /* address */ | |
134 | a_out->a_text, /* size */ | |
135 | VM_PROT_READ | VM_PROT_EXECUTE, /* protection */ | |
136 | VM_PROT_READ | VM_PROT_EXECUTE, /* max protection */ | |
137 | MAP_FILE | MAP_PRIVATE | MAP_FIXED, /* flags */ | |
138 | iparams->vnodep, /* vnode */ | |
139 | file_offset); /* offset */ | |
140 | if (error) | |
141 | return (error); | |
142 | ||
143 | /* | |
144 | * Map data read/write (if text is 0, assume text is in data area | |
145 | * [Bill's screwball mode]) | |
146 | */ | |
147 | vmaddr = virtual_offset + a_out->a_text; | |
148 | error = | |
149 | vm_mmap(&vmspace->vm_map, | |
150 | &vmaddr, | |
151 | a_out->a_data, | |
152 | VM_PROT_READ | VM_PROT_WRITE | (a_out->a_text ? 0 : VM_PROT_EXECUTE), | |
153 | VM_PROT_READ | VM_PROT_WRITE | (a_out->a_text ? 0 : VM_PROT_EXECUTE), | |
154 | MAP_FILE | MAP_PRIVATE | MAP_FIXED, | |
155 | iparams->vnodep, | |
156 | file_offset + a_out->a_text); | |
157 | if (error) | |
158 | return (error); | |
159 | ||
160 | /* | |
161 | * Allocate demand-zeroed area for uninitialized data | |
162 | * "bss" = 'block started by symbol' - named after the IBM 7090 | |
163 | * instruction of the same name. | |
164 | */ | |
165 | vmaddr = virtual_offset + a_out->a_text + a_out->a_data; | |
166 | error = vm_allocate(&vmspace->vm_map, &vmaddr, bss_size, FALSE); | |
167 | if (error) | |
168 | return (error); | |
169 | ||
170 | /* Fill in process VM information */ | |
171 | vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; | |
172 | vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; | |
173 | vmspace->vm_taddr = (caddr_t) virtual_offset; | |
174 | vmspace->vm_daddr = (caddr_t) virtual_offset + a_out->a_text; | |
175 | ||
176 | /* Fill in image_params */ | |
177 | iparams->interpreted = 0; | |
178 | iparams->entry_addr = a_out->a_entry; | |
179 | ||
180 | return (0); | |
181 | } |