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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Sergey Bondari |
2 | * Copyright (C) 2006 Sergey Bondari |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <elf.h> |
29 | #include <elf.h> |
30 | #include <debug.h> |
30 | #include <debug.h> |
31 | #include <arch/types.h> |
31 | #include <arch/types.h> |
32 | #include <typedefs.h> |
32 | #include <typedefs.h> |
33 | #include <mm/as.h> |
33 | #include <mm/as.h> |
34 | #include <mm/frame.h> |
34 | #include <mm/frame.h> |
35 | #include <mm/slab.h> |
35 | #include <mm/slab.h> |
36 | #include <print.h> |
36 | #include <print.h> |
37 | #include <align.h> |
37 | #include <align.h> |
38 | #include <memstr.h> |
38 | #include <memstr.h> |
39 | #include <macros.h> |
39 | #include <macros.h> |
40 | 40 | ||
41 | static char *error_codes[] = { |
41 | static char *error_codes[] = { |
42 | "no error", |
42 | "no error", |
43 | "invalid image", |
43 | "invalid image", |
44 | "address space error", |
44 | "address space error", |
45 | "incompatible image", |
45 | "incompatible image", |
46 | "unsupported image type", |
46 | "unsupported image type", |
47 | "irrecoverable error" |
47 | "irrecoverable error" |
48 | }; |
48 | }; |
49 | 49 | ||
50 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
50 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
51 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as); |
51 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as); |
52 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
52 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
53 | 53 | ||
54 | /** ELF loader |
54 | /** ELF loader |
55 | * |
55 | * |
56 | * @param header Pointer to ELF header in memory |
56 | * @param header Pointer to ELF header in memory |
57 | * @param as Created and properly mapped address space |
57 | * @param as Created and properly mapped address space |
58 | * @return EE_OK on success |
58 | * @return EE_OK on success |
59 | */ |
59 | */ |
60 | int elf_load(elf_header_t *header, as_t * as) |
60 | int elf_load(elf_header_t *header, as_t * as) |
61 | { |
61 | { |
62 | int i, rc; |
62 | int i, rc; |
63 | 63 | ||
64 | /* Identify ELF */ |
64 | /* Identify ELF */ |
65 | if (header->e_ident[EI_MAG0] != ELFMAG0 || header->e_ident[EI_MAG1] != ELFMAG1 || |
65 | if (header->e_ident[EI_MAG0] != ELFMAG0 || header->e_ident[EI_MAG1] != ELFMAG1 || |
66 | header->e_ident[EI_MAG2] != ELFMAG2 || header->e_ident[EI_MAG3] != ELFMAG3) { |
66 | header->e_ident[EI_MAG2] != ELFMAG2 || header->e_ident[EI_MAG3] != ELFMAG3) { |
67 | return EE_INVALID; |
67 | return EE_INVALID; |
68 | } |
68 | } |
69 | 69 | ||
70 | /* Identify ELF compatibility */ |
70 | /* Identify ELF compatibility */ |
71 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || header->e_machine != ELF_MACHINE || |
71 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || header->e_machine != ELF_MACHINE || |
72 | header->e_ident[EI_VERSION] != EV_CURRENT || header->e_version != EV_CURRENT || |
72 | header->e_ident[EI_VERSION] != EV_CURRENT || header->e_version != EV_CURRENT || |
73 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
73 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
74 | return EE_INCOMPATIBLE; |
74 | return EE_INCOMPATIBLE; |
75 | } |
75 | } |
76 | 76 | ||
77 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
77 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
78 | return EE_INCOMPATIBLE; |
78 | return EE_INCOMPATIBLE; |
79 | 79 | ||
80 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
80 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
81 | return EE_INCOMPATIBLE; |
81 | return EE_INCOMPATIBLE; |
82 | 82 | ||
83 | /* Check if the object type is supported. */ |
83 | /* Check if the object type is supported. */ |
84 | if (header->e_type != ET_EXEC) |
84 | if (header->e_type != ET_EXEC) |
85 | return EE_UNSUPPORTED; |
85 | return EE_UNSUPPORTED; |
86 | 86 | ||
87 | /* Walk through all segment headers and process them. */ |
87 | /* Walk through all segment headers and process them. */ |
88 | for (i = 0; i < header->e_phnum; i++) { |
88 | for (i = 0; i < header->e_phnum; i++) { |
89 | rc = segment_header(&((elf_segment_header_t *)(((__u8 *) header) + header->e_phoff))[i], header, as); |
89 | rc = segment_header(&((elf_segment_header_t *)(((__u8 *) header) + header->e_phoff))[i], header, as); |
90 | if (rc != EE_OK) |
90 | if (rc != EE_OK) |
91 | return rc; |
91 | return rc; |
92 | } |
92 | } |
93 | 93 | ||
94 | /* Inspect all section headers and proccess them. */ |
94 | /* Inspect all section headers and proccess them. */ |
95 | for (i = 0; i < header->e_shnum; i++) { |
95 | for (i = 0; i < header->e_shnum; i++) { |
96 | rc = section_header(&((elf_section_header_t *)(((__u8 *) header) + header->e_shoff))[i], header, as); |
96 | rc = section_header(&((elf_section_header_t *)(((__u8 *) header) + header->e_shoff))[i], header, as); |
97 | if (rc != EE_OK) |
97 | if (rc != EE_OK) |
98 | return rc; |
98 | return rc; |
99 | } |
99 | } |
100 | 100 | ||
101 | return EE_OK; |
101 | return EE_OK; |
102 | } |
102 | } |
103 | 103 | ||
104 | /** Print error message according to error code. |
104 | /** Print error message according to error code. |
105 | * |
105 | * |
106 | * @param rc Return code returned by elf_load(). |
106 | * @param rc Return code returned by elf_load(). |
107 | * |
107 | * |
108 | * @return NULL terminated description of error. |
108 | * @return NULL terminated description of error. |
109 | */ |
109 | */ |
110 | char *elf_error(int rc) |
110 | char *elf_error(int rc) |
111 | { |
111 | { |
112 | ASSERT(rc < sizeof(error_codes)/sizeof(char *)); |
112 | ASSERT(rc < sizeof(error_codes)/sizeof(char *)); |
113 | 113 | ||
114 | return error_codes[rc]; |
114 | return error_codes[rc]; |
115 | } |
115 | } |
116 | 116 | ||
117 | /** Process segment header. |
117 | /** Process segment header. |
118 | * |
118 | * |
119 | * @param entry Segment header. |
119 | * @param entry Segment header. |
120 | * @param elf ELF header. |
120 | * @param elf ELF header. |
121 | * @param as Address space into wich the ELF is being loaded. |
121 | * @param as Address space into wich the ELF is being loaded. |
122 | * |
122 | * |
123 | * @return EE_OK on success, error code otherwise. |
123 | * @return EE_OK on success, error code otherwise. |
124 | */ |
124 | */ |
125 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
125 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
126 | { |
126 | { |
127 | switch (entry->p_type) { |
127 | switch (entry->p_type) { |
128 | case PT_NULL: |
128 | case PT_NULL: |
129 | case PT_PHDR: |
129 | case PT_PHDR: |
130 | break; |
130 | break; |
131 | case PT_LOAD: |
131 | case PT_LOAD: |
132 | return load_segment(entry, elf, as); |
132 | return load_segment(entry, elf, as); |
133 | break; |
133 | break; |
134 | case PT_DYNAMIC: |
134 | case PT_DYNAMIC: |
135 | case PT_INTERP: |
135 | case PT_INTERP: |
136 | case PT_SHLIB: |
136 | case PT_SHLIB: |
137 | case PT_NOTE: |
137 | case PT_NOTE: |
138 | case PT_LOPROC: |
138 | case PT_LOPROC: |
139 | case PT_HIPROC: |
139 | case PT_HIPROC: |
140 | default: |
140 | default: |
141 | return EE_UNSUPPORTED; |
141 | return EE_UNSUPPORTED; |
142 | break; |
142 | break; |
143 | } |
143 | } |
144 | return EE_OK; |
144 | return EE_OK; |
145 | } |
145 | } |
146 | 146 | ||
147 | /** Load segment described by program header entry. |
147 | /** Load segment described by program header entry. |
148 | * |
148 | * |
149 | * @param entry Program header entry describing segment to be loaded. |
149 | * @param entry Program header entry describing segment to be loaded. |
150 | * @param elf ELF header. |
150 | * @param elf ELF header. |
151 | * @parma as Address space into wich the ELF is being loaded. |
151 | * @parma as Address space into wich the ELF is being loaded. |
152 | * |
152 | * |
153 | * @return EE_OK on success, error code otherwise. |
153 | * @return EE_OK on success, error code otherwise. |
154 | */ |
154 | */ |
155 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
155 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
156 | { |
156 | { |
157 | as_area_t *a; |
157 | as_area_t *a; |
158 | int i, type = 0; |
158 | int i, type = 0; |
159 | size_t segment_size; |
159 | size_t segment_size; |
160 | __u8 *segment; |
160 | __u8 *segment; |
161 | 161 | ||
162 | if (entry->p_align > 1) { |
162 | if (entry->p_align > 1) { |
163 | if ((entry->p_offset % entry->p_align) != (entry->p_vaddr % entry->p_align)) { |
163 | if ((entry->p_offset % entry->p_align) != (entry->p_vaddr % entry->p_align)) { |
164 | return EE_INVALID; |
164 | return EE_INVALID; |
165 | } |
165 | } |
166 | } |
166 | } |
167 | 167 | ||
168 | /* |
168 | /* |
169 | * Check if the segment doesn't interfere with kernel address space. |
169 | * Check if the segment doesn't interfere with kernel address space. |
170 | */ |
170 | */ |
171 | if (entry->p_vaddr + ALIGN_UP(entry->p_memsz, PAGE_SIZE) >= USER_ADDRESS_SPACE_END) |
171 | if (entry->p_vaddr + ALIGN_UP(entry->p_memsz, PAGE_SIZE) >= USER_ADDRESS_SPACE_END) |
172 | return EE_MEMORY; |
172 | return EE_MEMORY; |
173 | 173 | ||
174 | if (entry->p_flags & PF_X) { |
174 | if (entry->p_flags & PF_X) { |
175 | type = AS_AREA_TEXT; |
175 | type = AS_AREA_TEXT; |
176 | } else if (entry->p_flags & PF_W) { |
176 | } else if (entry->p_flags & PF_W) { |
177 | type = AS_AREA_DATA; |
177 | type = AS_AREA_DATA; |
178 | } else { |
178 | } else { |
179 | return EE_UNSUPPORTED; |
179 | return EE_UNSUPPORTED; |
180 | } |
180 | } |
181 | 181 | ||
182 | /* |
182 | /* |
183 | * Check if the virtual address starts on page boundary. |
183 | * Check if the virtual address starts on page boundary. |
184 | */ |
184 | */ |
185 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
185 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
186 | return EE_UNSUPPORTED; |
186 | return EE_UNSUPPORTED; |
187 | 187 | ||
188 | /* |
188 | /* |
189 | * Copying the segment out is certainly necessary for segments with p_filesz < p_memsz |
189 | * Copying the segment out is certainly necessary for segments with p_filesz < p_memsz |
190 | * because of the effect of .bss-like sections. For security reasons, it looks like a |
190 | * because of the effect of .bss-like sections. For security reasons, it looks like a |
191 | * good idea to copy the segment anyway. |
191 | * good idea to copy the segment anyway. |
192 | */ |
192 | */ |
193 | segment_size = ALIGN_UP(max(entry->p_filesz, entry->p_memsz), PAGE_SIZE); |
193 | segment_size = ALIGN_UP(max(entry->p_filesz, entry->p_memsz), PAGE_SIZE); |
194 | segment = malloc(segment_size, 0); |
194 | segment = malloc(segment_size, 0); |
195 | if (entry->p_filesz < entry->p_memsz) |
195 | if (entry->p_filesz < entry->p_memsz) |
196 | memsetb((__address) (segment + entry->p_filesz), segment_size - entry->p_filesz, 0); |
196 | memsetb((__address) (segment + entry->p_filesz), segment_size - entry->p_filesz, 0); |
197 | memcpy(segment, (void *) (((__address) elf) + entry->p_offset), entry->p_filesz); |
197 | memcpy(segment, (void *) (((__address) elf) + entry->p_offset), entry->p_filesz); |
198 | 198 | ||
199 | a = as_area_create(as, AS_AREA_TEXT, SIZE2FRAMES(entry->p_memsz), entry->p_vaddr); |
199 | a = as_area_create(as, type, SIZE2FRAMES(entry->p_memsz), entry->p_vaddr); |
200 | if (!a) |
200 | if (!a) |
201 | return EE_IRRECOVERABLE; |
201 | return EE_IRRECOVERABLE; |
202 | 202 | ||
203 | for (i = 0; i < SIZE2FRAMES(entry->p_filesz); i++) { |
203 | for (i = 0; i < SIZE2FRAMES(entry->p_filesz); i++) { |
204 | as_set_mapping(as, entry->p_vaddr + i*PAGE_SIZE, KA2PA(((__address) segment) + i*PAGE_SIZE)); |
204 | as_set_mapping(as, entry->p_vaddr + i*PAGE_SIZE, KA2PA(((__address) segment) + i*PAGE_SIZE)); |
205 | } |
205 | } |
206 | 206 | ||
207 | return EE_OK; |
207 | return EE_OK; |
208 | } |
208 | } |
209 | 209 | ||
210 | /** Process section header. |
210 | /** Process section header. |
211 | * |
211 | * |
212 | * @param entry Segment header. |
212 | * @param entry Segment header. |
213 | * @param elf ELF header. |
213 | * @param elf ELF header. |
214 | * @param as Address space into wich the ELF is being loaded. |
214 | * @param as Address space into wich the ELF is being loaded. |
215 | * |
215 | * |
216 | * @return EE_OK on success, error code otherwise. |
216 | * @return EE_OK on success, error code otherwise. |
217 | */ |
217 | */ |
218 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as) |
218 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as) |
219 | { |
219 | { |
220 | switch (entry->sh_type) { |
220 | switch (entry->sh_type) { |
221 | default: |
221 | default: |
222 | break; |
222 | break; |
223 | } |
223 | } |
224 | 224 | ||
225 | return EE_OK; |
225 | return EE_OK; |
226 | } |
226 | } |
227 | 227 |