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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 <elf.h> |
39 | #include <elf.h> |
40 | #include <debug.h> |
40 | #include <debug.h> |
41 | #include <arch/types.h> |
41 | #include <arch/types.h> |
42 | #include <typedefs.h> |
42 | #include <typedefs.h> |
43 | #include <mm/as.h> |
43 | #include <mm/as.h> |
44 | #include <mm/frame.h> |
44 | #include <mm/frame.h> |
45 | #include <mm/slab.h> |
45 | #include <mm/slab.h> |
46 | #include <align.h> |
46 | #include <align.h> |
47 | #include <memstr.h> |
47 | #include <memstr.h> |
48 | #include <macros.h> |
48 | #include <macros.h> |
49 | #include <arch.h> |
49 | #include <arch.h> |
50 | 50 | ||
51 | static char *error_codes[] = { |
51 | static char *error_codes[] = { |
52 | "no error", |
52 | "no error", |
53 | "invalid image", |
53 | "invalid image", |
54 | "address space error", |
54 | "address space error", |
55 | "incompatible image", |
55 | "incompatible image", |
56 | "unsupported image type", |
56 | "unsupported image type", |
57 | "irrecoverable error" |
57 | "irrecoverable error" |
58 | }; |
58 | }; |
59 | 59 | ||
60 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
60 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
61 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as); |
61 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as); |
62 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
62 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
63 | 63 | ||
64 | /** ELF loader |
64 | /** ELF loader |
65 | * |
65 | * |
66 | * @param header Pointer to ELF header in memory |
66 | * @param header Pointer to ELF header in memory |
67 | * @param as Created and properly mapped address space |
67 | * @param as Created and properly mapped address space |
68 | * @return EE_OK on success |
68 | * @return EE_OK on success |
69 | */ |
69 | */ |
70 | int elf_load(elf_header_t *header, as_t * as) |
70 | int elf_load(elf_header_t *header, as_t * as) |
71 | { |
71 | { |
72 | int i, rc; |
72 | int i, rc; |
73 | 73 | ||
74 | /* Identify ELF */ |
74 | /* Identify ELF */ |
75 | if (header->e_ident[EI_MAG0] != ELFMAG0 || header->e_ident[EI_MAG1] != ELFMAG1 || |
75 | if (header->e_ident[EI_MAG0] != ELFMAG0 || header->e_ident[EI_MAG1] != ELFMAG1 || |
76 | header->e_ident[EI_MAG2] != ELFMAG2 || header->e_ident[EI_MAG3] != ELFMAG3) { |
76 | header->e_ident[EI_MAG2] != ELFMAG2 || header->e_ident[EI_MAG3] != ELFMAG3) { |
77 | return EE_INVALID; |
77 | return EE_INVALID; |
78 | } |
78 | } |
79 | 79 | ||
80 | /* Identify ELF compatibility */ |
80 | /* Identify ELF compatibility */ |
81 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || header->e_machine != ELF_MACHINE || |
81 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || header->e_machine != ELF_MACHINE || |
82 | header->e_ident[EI_VERSION] != EV_CURRENT || header->e_version != EV_CURRENT || |
82 | header->e_ident[EI_VERSION] != EV_CURRENT || header->e_version != EV_CURRENT || |
83 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
83 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
84 | return EE_INCOMPATIBLE; |
84 | return EE_INCOMPATIBLE; |
85 | } |
85 | } |
86 | 86 | ||
87 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
87 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
88 | return EE_INCOMPATIBLE; |
88 | return EE_INCOMPATIBLE; |
89 | 89 | ||
90 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
90 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
91 | return EE_INCOMPATIBLE; |
91 | return EE_INCOMPATIBLE; |
92 | 92 | ||
93 | /* Check if the object type is supported. */ |
93 | /* Check if the object type is supported. */ |
94 | if (header->e_type != ET_EXEC) |
94 | if (header->e_type != ET_EXEC) |
95 | return EE_UNSUPPORTED; |
95 | return EE_UNSUPPORTED; |
96 | 96 | ||
97 | /* Walk through all segment headers and process them. */ |
97 | /* Walk through all segment headers and process them. */ |
98 | for (i = 0; i < header->e_phnum; i++) { |
98 | for (i = 0; i < header->e_phnum; i++) { |
99 | rc = segment_header(&((elf_segment_header_t *)(((__u8 *) header) + header->e_phoff))[i], header, as); |
99 | rc = segment_header(&((elf_segment_header_t *)(((uint8_t *) header) + header->e_phoff))[i], header, as); |
100 | if (rc != EE_OK) |
100 | if (rc != EE_OK) |
101 | return rc; |
101 | return rc; |
102 | } |
102 | } |
103 | 103 | ||
104 | /* Inspect all section headers and proccess them. */ |
104 | /* Inspect all section headers and proccess them. */ |
105 | for (i = 0; i < header->e_shnum; i++) { |
105 | for (i = 0; i < header->e_shnum; i++) { |
106 | rc = section_header(&((elf_section_header_t *)(((__u8 *) header) + header->e_shoff))[i], header, as); |
106 | rc = section_header(&((elf_section_header_t *)(((uint8_t *) header) + header->e_shoff))[i], header, as); |
107 | if (rc != EE_OK) |
107 | if (rc != EE_OK) |
108 | return rc; |
108 | return rc; |
109 | } |
109 | } |
110 | 110 | ||
111 | return EE_OK; |
111 | return EE_OK; |
112 | } |
112 | } |
113 | 113 | ||
114 | /** Print error message according to error code. |
114 | /** Print error message according to error code. |
115 | * |
115 | * |
116 | * @param rc Return code returned by elf_load(). |
116 | * @param rc Return code returned by elf_load(). |
117 | * |
117 | * |
118 | * @return NULL terminated description of error. |
118 | * @return NULL terminated description of error. |
119 | */ |
119 | */ |
120 | char *elf_error(int rc) |
120 | char *elf_error(int rc) |
121 | { |
121 | { |
122 | ASSERT(rc < sizeof(error_codes)/sizeof(char *)); |
122 | ASSERT(rc < sizeof(error_codes)/sizeof(char *)); |
123 | 123 | ||
124 | return error_codes[rc]; |
124 | return error_codes[rc]; |
125 | } |
125 | } |
126 | 126 | ||
127 | /** Process segment header. |
127 | /** Process segment header. |
128 | * |
128 | * |
129 | * @param entry Segment header. |
129 | * @param entry Segment header. |
130 | * @param elf ELF header. |
130 | * @param elf ELF header. |
131 | * @param as Address space into wich the ELF is being loaded. |
131 | * @param as Address space into wich the ELF is being loaded. |
132 | * |
132 | * |
133 | * @return EE_OK on success, error code otherwise. |
133 | * @return EE_OK on success, error code otherwise. |
134 | */ |
134 | */ |
135 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
135 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
136 | { |
136 | { |
137 | switch (entry->p_type) { |
137 | switch (entry->p_type) { |
138 | case PT_NULL: |
138 | case PT_NULL: |
139 | case PT_PHDR: |
139 | case PT_PHDR: |
140 | break; |
140 | break; |
141 | case PT_LOAD: |
141 | case PT_LOAD: |
142 | return load_segment(entry, elf, as); |
142 | return load_segment(entry, elf, as); |
143 | break; |
143 | break; |
144 | case PT_DYNAMIC: |
144 | case PT_DYNAMIC: |
145 | case PT_INTERP: |
145 | case PT_INTERP: |
146 | case PT_SHLIB: |
146 | case PT_SHLIB: |
147 | case PT_NOTE: |
147 | case PT_NOTE: |
148 | case PT_LOPROC: |
148 | case PT_LOPROC: |
149 | case PT_HIPROC: |
149 | case PT_HIPROC: |
150 | default: |
150 | default: |
151 | return EE_UNSUPPORTED; |
151 | return EE_UNSUPPORTED; |
152 | break; |
152 | break; |
153 | } |
153 | } |
154 | return EE_OK; |
154 | return EE_OK; |
155 | } |
155 | } |
156 | 156 | ||
157 | /** Load segment described by program header entry. |
157 | /** Load segment described by program header entry. |
158 | * |
158 | * |
159 | * @param entry Program header entry describing segment to be loaded. |
159 | * @param entry Program header entry describing segment to be loaded. |
160 | * @param elf ELF header. |
160 | * @param elf ELF header. |
161 | * @param as Address space into wich the ELF is being loaded. |
161 | * @param as Address space into wich the ELF is being loaded. |
162 | * |
162 | * |
163 | * @return EE_OK on success, error code otherwise. |
163 | * @return EE_OK on success, error code otherwise. |
164 | */ |
164 | */ |
165 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
165 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
166 | { |
166 | { |
167 | as_area_t *a; |
167 | as_area_t *a; |
168 | int flags = 0; |
168 | int flags = 0; |
169 | mem_backend_data_t backend_data; |
169 | mem_backend_data_t backend_data; |
170 | 170 | ||
171 | backend_data.elf = elf; |
171 | backend_data.elf = elf; |
172 | backend_data.segment = entry; |
172 | backend_data.segment = entry; |
173 | 173 | ||
174 | if (entry->p_align > 1) { |
174 | if (entry->p_align > 1) { |
175 | if ((entry->p_offset % entry->p_align) != (entry->p_vaddr % entry->p_align)) { |
175 | if ((entry->p_offset % entry->p_align) != (entry->p_vaddr % entry->p_align)) { |
176 | return EE_INVALID; |
176 | return EE_INVALID; |
177 | } |
177 | } |
178 | } |
178 | } |
179 | 179 | ||
180 | if (entry->p_flags & PF_X) |
180 | if (entry->p_flags & PF_X) |
181 | flags |= AS_AREA_EXEC; |
181 | flags |= AS_AREA_EXEC; |
182 | if (entry->p_flags & PF_W) |
182 | if (entry->p_flags & PF_W) |
183 | flags |= AS_AREA_WRITE; |
183 | flags |= AS_AREA_WRITE; |
184 | if (entry->p_flags & PF_R) |
184 | if (entry->p_flags & PF_R) |
185 | flags |= AS_AREA_READ; |
185 | flags |= AS_AREA_READ; |
186 | flags |= AS_AREA_CACHEABLE; |
186 | flags |= AS_AREA_CACHEABLE; |
187 | 187 | ||
188 | /* |
188 | /* |
189 | * Check if the virtual address starts on page boundary. |
189 | * Check if the virtual address starts on page boundary. |
190 | */ |
190 | */ |
191 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
191 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
192 | return EE_UNSUPPORTED; |
192 | return EE_UNSUPPORTED; |
193 | 193 | ||
194 | a = as_area_create(as, flags, entry->p_memsz, entry->p_vaddr, AS_AREA_ATTR_NONE, |
194 | a = as_area_create(as, flags, entry->p_memsz, entry->p_vaddr, AS_AREA_ATTR_NONE, |
195 | &elf_backend, &backend_data); |
195 | &elf_backend, &backend_data); |
196 | if (!a) |
196 | if (!a) |
197 | return EE_MEMORY; |
197 | return EE_MEMORY; |
198 | 198 | ||
199 | /* |
199 | /* |
200 | * The segment will be mapped on demand by elf_page_fault(). |
200 | * The segment will be mapped on demand by elf_page_fault(). |
201 | */ |
201 | */ |
202 | 202 | ||
203 | return EE_OK; |
203 | return EE_OK; |
204 | } |
204 | } |
205 | 205 | ||
206 | /** Process section header. |
206 | /** Process section header. |
207 | * |
207 | * |
208 | * @param entry Segment header. |
208 | * @param entry Segment header. |
209 | * @param elf ELF header. |
209 | * @param elf ELF header. |
210 | * @param as Address space into wich the ELF is being loaded. |
210 | * @param as Address space into wich the ELF is being loaded. |
211 | * |
211 | * |
212 | * @return EE_OK on success, error code otherwise. |
212 | * @return EE_OK on success, error code otherwise. |
213 | */ |
213 | */ |
214 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as) |
214 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as) |
215 | { |
215 | { |
216 | switch (entry->sh_type) { |
216 | switch (entry->sh_type) { |
217 | default: |
217 | default: |
218 | break; |
218 | break; |
219 | } |
219 | } |
220 | 220 | ||
221 | return EE_OK; |
221 | return EE_OK; |
222 | } |
222 | } |
223 | 223 | ||
224 | /** @} |
224 | /** @} |
225 | */ |
225 | */ |
226 | 226 |