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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Sergey Bondari |
2 | * Copyright (c) 2006 Sergey Bondari |
3 | * Copyright (c) 2006 Jakub Jermar |
3 | * Copyright (c) 2006 Jakub Jermar |
4 | * All rights reserved. |
4 | * All rights reserved. |
5 | * |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
8 | * are met: |
9 | * |
9 | * |
10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
17 | * |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
28 | */ |
29 | 29 | ||
30 | /** @addtogroup generic |
30 | /** @addtogroup generic |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | 33 | ||
34 | /** |
34 | /** |
35 | * @file |
35 | * @file |
36 | * @brief Kernel ELF loader. |
36 | * @brief Kernel ELF loader. |
37 | */ |
37 | */ |
38 | 38 | ||
39 | #include <lib/elf.h> |
39 | #include <lib/elf.h> |
40 | #include <debug.h> |
40 | #include <debug.h> |
41 | #include <arch/types.h> |
41 | #include <arch/types.h> |
42 | #include <mm/as.h> |
42 | #include <mm/as.h> |
43 | #include <mm/frame.h> |
43 | #include <mm/frame.h> |
44 | #include <mm/slab.h> |
44 | #include <mm/slab.h> |
45 | #include <align.h> |
45 | #include <align.h> |
46 | #include <memstr.h> |
46 | #include <memstr.h> |
47 | #include <macros.h> |
47 | #include <macros.h> |
48 | #include <arch.h> |
48 | #include <arch.h> |
49 | 49 | ||
50 | static char *error_codes[] = { |
50 | static char *error_codes[] = { |
51 | "no error", |
51 | "no error", |
52 | "invalid image", |
52 | "invalid image", |
53 | "address space error", |
53 | "address space error", |
54 | "incompatible image", |
54 | "incompatible image", |
55 | "unsupported image type", |
55 | "unsupported image type", |
56 | "irrecoverable error" |
56 | "irrecoverable error" |
57 | }; |
57 | }; |
58 | 58 | ||
59 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, |
59 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, |
60 | as_t *as); |
60 | as_t *as); |
61 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, |
61 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, |
62 | as_t *as); |
62 | as_t *as); |
63 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, |
63 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, |
64 | as_t *as); |
64 | as_t *as); |
65 | 65 | ||
66 | /** ELF loader |
66 | /** ELF loader |
67 | * |
67 | * |
68 | * @param header Pointer to ELF header in memory |
68 | * @param header Pointer to ELF header in memory |
69 | * @param as Created and properly mapped address space |
69 | * @param as Created and properly mapped address space |
70 | * @return EE_OK on success |
70 | * @return EE_OK on success |
71 | */ |
71 | */ |
72 | unsigned int elf_load(elf_header_t *header, as_t * as) |
72 | unsigned int elf_load(elf_header_t *header, as_t * as) |
73 | { |
73 | { |
74 | int i, rc; |
74 | int i, rc; |
75 | 75 | ||
76 | /* Identify ELF */ |
76 | /* Identify ELF */ |
77 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
77 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
78 | header->e_ident[EI_MAG1] != ELFMAG1 || |
78 | header->e_ident[EI_MAG1] != ELFMAG1 || |
79 | header->e_ident[EI_MAG2] != ELFMAG2 || |
79 | header->e_ident[EI_MAG2] != ELFMAG2 || |
80 | header->e_ident[EI_MAG3] != ELFMAG3) { |
80 | header->e_ident[EI_MAG3] != ELFMAG3) { |
81 | return EE_INVALID; |
81 | return EE_INVALID; |
82 | } |
82 | } |
83 | 83 | ||
84 | /* Identify ELF compatibility */ |
84 | /* Identify ELF compatibility */ |
85 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
85 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
86 | header->e_machine != ELF_MACHINE || |
86 | header->e_machine != ELF_MACHINE || |
87 | header->e_ident[EI_VERSION] != EV_CURRENT || |
87 | header->e_ident[EI_VERSION] != EV_CURRENT || |
88 | header->e_version != EV_CURRENT || |
88 | header->e_version != EV_CURRENT || |
89 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
89 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
90 | return EE_INCOMPATIBLE; |
90 | return EE_INCOMPATIBLE; |
91 | } |
91 | } |
92 | 92 | ||
93 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
93 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
94 | return EE_INCOMPATIBLE; |
94 | return EE_INCOMPATIBLE; |
95 | 95 | ||
96 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
96 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
97 | return EE_INCOMPATIBLE; |
97 | return EE_INCOMPATIBLE; |
98 | 98 | ||
99 | /* Check if the object type is supported. */ |
99 | /* Check if the object type is supported. */ |
100 | if (header->e_type != ET_EXEC) |
100 | if (header->e_type != ET_EXEC) |
101 | return EE_UNSUPPORTED; |
101 | return EE_UNSUPPORTED; |
102 | 102 | ||
- | 103 | /* Check if the ELF image starts on a page boundary */ |
|
- | 104 | if (ALIGN_UP((uintptr_t)header, PAGE_SIZE) != (uintptr_t)header) |
|
- | 105 | return EE_UNSUPPORTED; |
|
- | 106 | ||
103 | /* Walk through all segment headers and process them. */ |
107 | /* Walk through all segment headers and process them. */ |
104 | for (i = 0; i < header->e_phnum; i++) { |
108 | for (i = 0; i < header->e_phnum; i++) { |
105 | elf_segment_header_t *seghdr; |
109 | elf_segment_header_t *seghdr; |
106 | 110 | ||
107 | seghdr = &((elf_segment_header_t *)(((uint8_t *) header) + |
111 | seghdr = &((elf_segment_header_t *)(((uint8_t *) header) + |
108 | header->e_phoff))[i]; |
112 | header->e_phoff))[i]; |
109 | rc = segment_header(seghdr, header, as); |
113 | rc = segment_header(seghdr, header, as); |
110 | if (rc != EE_OK) |
114 | if (rc != EE_OK) |
111 | return rc; |
115 | return rc; |
112 | } |
116 | } |
113 | 117 | ||
114 | /* Inspect all section headers and proccess them. */ |
118 | /* Inspect all section headers and proccess them. */ |
115 | for (i = 0; i < header->e_shnum; i++) { |
119 | for (i = 0; i < header->e_shnum; i++) { |
116 | elf_section_header_t *sechdr; |
120 | elf_section_header_t *sechdr; |
117 | 121 | ||
118 | sechdr = &((elf_section_header_t *)(((uint8_t *) header) + |
122 | sechdr = &((elf_section_header_t *)(((uint8_t *) header) + |
119 | header->e_shoff))[i]; |
123 | header->e_shoff))[i]; |
120 | rc = section_header(sechdr, header, as); |
124 | rc = section_header(sechdr, header, as); |
121 | if (rc != EE_OK) |
125 | if (rc != EE_OK) |
122 | return rc; |
126 | return rc; |
123 | } |
127 | } |
124 | 128 | ||
125 | return EE_OK; |
129 | return EE_OK; |
126 | } |
130 | } |
127 | 131 | ||
128 | /** Print error message according to error code. |
132 | /** Print error message according to error code. |
129 | * |
133 | * |
130 | * @param rc Return code returned by elf_load(). |
134 | * @param rc Return code returned by elf_load(). |
131 | * |
135 | * |
132 | * @return NULL terminated description of error. |
136 | * @return NULL terminated description of error. |
133 | */ |
137 | */ |
134 | char *elf_error(unsigned int rc) |
138 | char *elf_error(unsigned int rc) |
135 | { |
139 | { |
136 | ASSERT(rc < sizeof(error_codes) / sizeof(char *)); |
140 | ASSERT(rc < sizeof(error_codes) / sizeof(char *)); |
137 | 141 | ||
138 | return error_codes[rc]; |
142 | return error_codes[rc]; |
139 | } |
143 | } |
140 | 144 | ||
141 | /** Process segment header. |
145 | /** Process segment header. |
142 | * |
146 | * |
143 | * @param entry Segment header. |
147 | * @param entry Segment header. |
144 | * @param elf ELF header. |
148 | * @param elf ELF header. |
145 | * @param as Address space into wich the ELF is being loaded. |
149 | * @param as Address space into wich the ELF is being loaded. |
146 | * |
150 | * |
147 | * @return EE_OK on success, error code otherwise. |
151 | * @return EE_OK on success, error code otherwise. |
148 | */ |
152 | */ |
149 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, |
153 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, |
150 | as_t *as) |
154 | as_t *as) |
151 | { |
155 | { |
152 | switch (entry->p_type) { |
156 | switch (entry->p_type) { |
153 | case PT_NULL: |
157 | case PT_NULL: |
154 | case PT_PHDR: |
158 | case PT_PHDR: |
155 | break; |
159 | break; |
156 | case PT_LOAD: |
160 | case PT_LOAD: |
157 | return load_segment(entry, elf, as); |
161 | return load_segment(entry, elf, as); |
158 | break; |
162 | break; |
159 | case PT_DYNAMIC: |
163 | case PT_DYNAMIC: |
160 | case PT_INTERP: |
164 | case PT_INTERP: |
161 | case PT_SHLIB: |
165 | case PT_SHLIB: |
162 | case PT_NOTE: |
166 | case PT_NOTE: |
163 | case PT_LOPROC: |
167 | case PT_LOPROC: |
164 | case PT_HIPROC: |
168 | case PT_HIPROC: |
165 | default: |
169 | default: |
166 | return EE_UNSUPPORTED; |
170 | return EE_UNSUPPORTED; |
167 | break; |
171 | break; |
168 | } |
172 | } |
169 | return EE_OK; |
173 | return EE_OK; |
170 | } |
174 | } |
171 | 175 | ||
172 | /** Load segment described by program header entry. |
176 | /** Load segment described by program header entry. |
173 | * |
177 | * |
174 | * @param entry Program header entry describing segment to be loaded. |
178 | * @param entry Program header entry describing segment to be loaded. |
175 | * @param elf ELF header. |
179 | * @param elf ELF header. |
176 | * @param as Address space into wich the ELF is being loaded. |
180 | * @param as Address space into wich the ELF is being loaded. |
177 | * |
181 | * |
178 | * @return EE_OK on success, error code otherwise. |
182 | * @return EE_OK on success, error code otherwise. |
179 | */ |
183 | */ |
180 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
184 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
181 | { |
185 | { |
182 | as_area_t *a; |
186 | as_area_t *a; |
183 | int flags = 0; |
187 | int flags = 0; |
184 | mem_backend_data_t backend_data; |
188 | mem_backend_data_t backend_data; |
- | 189 | uintptr_t base; |
|
- | 190 | size_t mem_sz; |
|
185 | 191 | ||
186 | backend_data.elf = elf; |
192 | backend_data.elf = elf; |
187 | backend_data.segment = entry; |
193 | backend_data.segment = entry; |
188 | 194 | ||
189 | if (entry->p_align > 1) { |
195 | if (entry->p_align > 1) { |
190 | if ((entry->p_offset % entry->p_align) != |
196 | if ((entry->p_offset % entry->p_align) != |
191 | (entry->p_vaddr % entry->p_align)) { |
197 | (entry->p_vaddr % entry->p_align)) { |
192 | return EE_INVALID; |
198 | return EE_INVALID; |
193 | } |
199 | } |
194 | } |
200 | } |
195 | 201 | ||
196 | if (entry->p_flags & PF_X) |
202 | if (entry->p_flags & PF_X) |
197 | flags |= AS_AREA_EXEC; |
203 | flags |= AS_AREA_EXEC; |
198 | if (entry->p_flags & PF_W) |
204 | if (entry->p_flags & PF_W) |
199 | flags |= AS_AREA_WRITE; |
205 | flags |= AS_AREA_WRITE; |
200 | if (entry->p_flags & PF_R) |
206 | if (entry->p_flags & PF_R) |
201 | flags |= AS_AREA_READ; |
207 | flags |= AS_AREA_READ; |
202 | flags |= AS_AREA_CACHEABLE; |
208 | flags |= AS_AREA_CACHEABLE; |
203 | 209 | ||
204 | /* |
210 | /* |
- | 211 | * Align vaddr down, inserting a little "gap" at the beginning. |
|
205 | * Check if the virtual address starts on page boundary. |
212 | * Adjust area size, so that its end remains in place. |
206 | */ |
213 | */ |
207 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
214 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
208 | return EE_UNSUPPORTED; |
215 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
209 | 216 | ||
210 | a = as_area_create(as, flags, entry->p_memsz, entry->p_vaddr, |
217 | a = as_area_create(as, flags, mem_sz, base, |
211 | AS_AREA_ATTR_NONE, &elf_backend, &backend_data); |
218 | AS_AREA_ATTR_NONE, &elf_backend, &backend_data); |
212 | if (!a) |
219 | if (!a) |
213 | return EE_MEMORY; |
220 | return EE_MEMORY; |
214 | 221 | ||
215 | /* |
222 | /* |
216 | * The segment will be mapped on demand by elf_page_fault(). |
223 | * The segment will be mapped on demand by elf_page_fault(). |
217 | */ |
224 | */ |
218 | 225 | ||
219 | return EE_OK; |
226 | return EE_OK; |
220 | } |
227 | } |
221 | 228 | ||
222 | /** Process section header. |
229 | /** Process section header. |
223 | * |
230 | * |
224 | * @param entry Segment header. |
231 | * @param entry Segment header. |
225 | * @param elf ELF header. |
232 | * @param elf ELF header. |
226 | * @param as Address space into wich the ELF is being loaded. |
233 | * @param as Address space into wich the ELF is being loaded. |
227 | * |
234 | * |
228 | * @return EE_OK on success, error code otherwise. |
235 | * @return EE_OK on success, error code otherwise. |
229 | */ |
236 | */ |
230 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, |
237 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, |
231 | as_t *as) |
238 | as_t *as) |
232 | { |
239 | { |
233 | switch (entry->sh_type) { |
240 | switch (entry->sh_type) { |
234 | case SHT_PROGBITS: |
241 | case SHT_PROGBITS: |
235 | if (entry->sh_flags & SHF_TLS) { |
242 | if (entry->sh_flags & SHF_TLS) { |
236 | /* .tdata */ |
243 | /* .tdata */ |
237 | } |
244 | } |
238 | break; |
245 | break; |
239 | case SHT_NOBITS: |
246 | case SHT_NOBITS: |
240 | if (entry->sh_flags & SHF_TLS) { |
247 | if (entry->sh_flags & SHF_TLS) { |
241 | /* .tbss */ |
248 | /* .tbss */ |
242 | } |
249 | } |
243 | break; |
250 | break; |
244 | default: |
251 | default: |
245 | break; |
252 | break; |
246 | } |
253 | } |
247 | 254 | ||
248 | return EE_OK; |
255 | return EE_OK; |
249 | } |
256 | } |
250 | 257 | ||
251 | /** @} |
258 | /** @} |
252 | */ |
259 | */ |
253 | 260 |