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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 | /** |
30 | /** |
31 | * @file elf.c |
31 | * @file elf.c |
32 | * @brief Kernel ELF loader. |
32 | * @brief Kernel ELF loader. |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <elf.h> |
35 | #include <elf.h> |
36 | #include <debug.h> |
36 | #include <debug.h> |
37 | #include <arch/types.h> |
37 | #include <arch/types.h> |
38 | #include <typedefs.h> |
38 | #include <typedefs.h> |
39 | #include <mm/as.h> |
39 | #include <mm/as.h> |
40 | #include <mm/frame.h> |
40 | #include <mm/frame.h> |
41 | #include <mm/slab.h> |
41 | #include <mm/slab.h> |
42 | #include <align.h> |
42 | #include <align.h> |
43 | #include <memstr.h> |
43 | #include <memstr.h> |
44 | #include <macros.h> |
44 | #include <macros.h> |
45 | #include <arch.h> |
45 | #include <arch.h> |
46 | 46 | ||
47 | static char *error_codes[] = { |
47 | static char *error_codes[] = { |
48 | "no error", |
48 | "no error", |
49 | "invalid image", |
49 | "invalid image", |
50 | "address space error", |
50 | "address space error", |
51 | "incompatible image", |
51 | "incompatible image", |
52 | "unsupported image type", |
52 | "unsupported image type", |
53 | "irrecoverable error" |
53 | "irrecoverable error" |
54 | }; |
54 | }; |
55 | 55 | ||
56 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
56 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
57 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as); |
57 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as); |
58 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
58 | static int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as); |
59 | 59 | ||
60 | /** ELF loader |
60 | /** ELF loader |
61 | * |
61 | * |
62 | * @param header Pointer to ELF header in memory |
62 | * @param header Pointer to ELF header in memory |
63 | * @param as Created and properly mapped address space |
63 | * @param as Created and properly mapped address space |
64 | * @return EE_OK on success |
64 | * @return EE_OK on success |
65 | */ |
65 | */ |
66 | int elf_load(elf_header_t *header, as_t * as) |
66 | int elf_load(elf_header_t *header, as_t * as) |
67 | { |
67 | { |
68 | int i, rc; |
68 | int i, rc; |
69 | 69 | ||
70 | /* Identify ELF */ |
70 | /* Identify ELF */ |
71 | if (header->e_ident[EI_MAG0] != ELFMAG0 || header->e_ident[EI_MAG1] != ELFMAG1 || |
71 | if (header->e_ident[EI_MAG0] != ELFMAG0 || header->e_ident[EI_MAG1] != ELFMAG1 || |
72 | header->e_ident[EI_MAG2] != ELFMAG2 || header->e_ident[EI_MAG3] != ELFMAG3) { |
72 | header->e_ident[EI_MAG2] != ELFMAG2 || header->e_ident[EI_MAG3] != ELFMAG3) { |
73 | return EE_INVALID; |
73 | return EE_INVALID; |
74 | } |
74 | } |
75 | 75 | ||
76 | /* Identify ELF compatibility */ |
76 | /* Identify ELF compatibility */ |
77 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || header->e_machine != ELF_MACHINE || |
77 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || header->e_machine != ELF_MACHINE || |
78 | header->e_ident[EI_VERSION] != EV_CURRENT || header->e_version != EV_CURRENT || |
78 | header->e_ident[EI_VERSION] != EV_CURRENT || header->e_version != EV_CURRENT || |
79 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
79 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
80 | return EE_INCOMPATIBLE; |
80 | return EE_INCOMPATIBLE; |
81 | } |
81 | } |
82 | 82 | ||
83 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
83 | if (header->e_phentsize != sizeof(elf_segment_header_t)) |
84 | return EE_INCOMPATIBLE; |
84 | return EE_INCOMPATIBLE; |
85 | 85 | ||
86 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
86 | if (header->e_shentsize != sizeof(elf_section_header_t)) |
87 | return EE_INCOMPATIBLE; |
87 | return EE_INCOMPATIBLE; |
88 | 88 | ||
89 | /* Check if the object type is supported. */ |
89 | /* Check if the object type is supported. */ |
90 | if (header->e_type != ET_EXEC) |
90 | if (header->e_type != ET_EXEC) |
91 | return EE_UNSUPPORTED; |
91 | return EE_UNSUPPORTED; |
92 | 92 | ||
93 | /* Walk through all segment headers and process them. */ |
93 | /* Walk through all segment headers and process them. */ |
94 | for (i = 0; i < header->e_phnum; i++) { |
94 | for (i = 0; i < header->e_phnum; i++) { |
95 | rc = segment_header(&((elf_segment_header_t *)(((__u8 *) header) + header->e_phoff))[i], header, as); |
95 | rc = segment_header(&((elf_segment_header_t *)(((__u8 *) header) + header->e_phoff))[i], header, as); |
96 | if (rc != EE_OK) |
96 | if (rc != EE_OK) |
97 | return rc; |
97 | return rc; |
98 | } |
98 | } |
99 | 99 | ||
100 | /* Inspect all section headers and proccess them. */ |
100 | /* Inspect all section headers and proccess them. */ |
101 | for (i = 0; i < header->e_shnum; i++) { |
101 | for (i = 0; i < header->e_shnum; i++) { |
102 | rc = section_header(&((elf_section_header_t *)(((__u8 *) header) + header->e_shoff))[i], header, as); |
102 | rc = section_header(&((elf_section_header_t *)(((__u8 *) header) + header->e_shoff))[i], header, as); |
103 | if (rc != EE_OK) |
103 | if (rc != EE_OK) |
104 | return rc; |
104 | return rc; |
105 | } |
105 | } |
106 | 106 | ||
107 | return EE_OK; |
107 | return EE_OK; |
108 | } |
108 | } |
109 | 109 | ||
110 | /** Print error message according to error code. |
110 | /** Print error message according to error code. |
111 | * |
111 | * |
112 | * @param rc Return code returned by elf_load(). |
112 | * @param rc Return code returned by elf_load(). |
113 | * |
113 | * |
114 | * @return NULL terminated description of error. |
114 | * @return NULL terminated description of error. |
115 | */ |
115 | */ |
116 | char *elf_error(int rc) |
116 | char *elf_error(int rc) |
117 | { |
117 | { |
118 | ASSERT(rc < sizeof(error_codes)/sizeof(char *)); |
118 | ASSERT(rc < sizeof(error_codes)/sizeof(char *)); |
119 | 119 | ||
120 | return error_codes[rc]; |
120 | return error_codes[rc]; |
121 | } |
121 | } |
122 | 122 | ||
123 | /** Process segment header. |
123 | /** Process segment header. |
124 | * |
124 | * |
125 | * @param entry Segment header. |
125 | * @param entry Segment header. |
126 | * @param elf ELF header. |
126 | * @param elf ELF header. |
127 | * @param as Address space into wich the ELF is being loaded. |
127 | * @param as Address space into wich the ELF is being loaded. |
128 | * |
128 | * |
129 | * @return EE_OK on success, error code otherwise. |
129 | * @return EE_OK on success, error code otherwise. |
130 | */ |
130 | */ |
131 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
131 | static int segment_header(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
132 | { |
132 | { |
133 | switch (entry->p_type) { |
133 | switch (entry->p_type) { |
134 | case PT_NULL: |
134 | case PT_NULL: |
135 | case PT_PHDR: |
135 | case PT_PHDR: |
136 | break; |
136 | break; |
137 | case PT_LOAD: |
137 | case PT_LOAD: |
138 | return load_segment(entry, elf, as); |
138 | return load_segment(entry, elf, as); |
139 | break; |
139 | break; |
140 | case PT_DYNAMIC: |
140 | case PT_DYNAMIC: |
141 | case PT_INTERP: |
141 | case PT_INTERP: |
142 | case PT_SHLIB: |
142 | case PT_SHLIB: |
143 | case PT_NOTE: |
143 | case PT_NOTE: |
144 | case PT_LOPROC: |
144 | case PT_LOPROC: |
145 | case PT_HIPROC: |
145 | case PT_HIPROC: |
146 | default: |
146 | default: |
147 | return EE_UNSUPPORTED; |
147 | return EE_UNSUPPORTED; |
148 | break; |
148 | break; |
149 | } |
149 | } |
150 | return EE_OK; |
150 | return EE_OK; |
151 | } |
151 | } |
152 | 152 | ||
153 | /** Load segment described by program header entry. |
153 | /** Load segment described by program header entry. |
154 | * |
154 | * |
155 | * @param entry Program header entry describing segment to be loaded. |
155 | * @param entry Program header entry describing segment to be loaded. |
156 | * @param elf ELF header. |
156 | * @param elf ELF header. |
157 | * @param as Address space into wich the ELF is being loaded. |
157 | * @param as Address space into wich the ELF is being loaded. |
158 | * |
158 | * |
159 | * @return EE_OK on success, error code otherwise. |
159 | * @return EE_OK on success, error code otherwise. |
160 | */ |
160 | */ |
161 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
161 | int load_segment(elf_segment_header_t *entry, elf_header_t *elf, as_t *as) |
162 | { |
162 | { |
163 | as_area_t *a; |
163 | as_area_t *a; |
164 | int flags = 0; |
164 | int flags = 0; |
165 | mem_backend_data_t backend_data = { .d1 = (__native) elf, .d2 = (__native) entry }; |
165 | mem_backend_data_t backend_data; |
- | 166 | ||
- | 167 | backend_data.elf = elf; |
|
- | 168 | backend_data.segment = entry; |
|
166 | 169 | ||
167 | if (entry->p_align > 1) { |
170 | if (entry->p_align > 1) { |
168 | if ((entry->p_offset % entry->p_align) != (entry->p_vaddr % entry->p_align)) { |
171 | if ((entry->p_offset % entry->p_align) != (entry->p_vaddr % entry->p_align)) { |
169 | return EE_INVALID; |
172 | return EE_INVALID; |
170 | } |
173 | } |
171 | } |
174 | } |
172 | 175 | ||
173 | if (entry->p_flags & PF_X) |
176 | if (entry->p_flags & PF_X) |
174 | flags |= AS_AREA_EXEC; |
177 | flags |= AS_AREA_EXEC; |
175 | if (entry->p_flags & PF_W) |
178 | if (entry->p_flags & PF_W) |
176 | flags |= AS_AREA_WRITE; |
179 | flags |= AS_AREA_WRITE; |
177 | if (entry->p_flags & PF_R) |
180 | if (entry->p_flags & PF_R) |
178 | flags |= AS_AREA_READ; |
181 | flags |= AS_AREA_READ; |
179 | flags |= AS_AREA_CACHEABLE; |
182 | flags |= AS_AREA_CACHEABLE; |
180 | 183 | ||
181 | /* |
184 | /* |
182 | * Check if the virtual address starts on page boundary. |
185 | * Check if the virtual address starts on page boundary. |
183 | */ |
186 | */ |
184 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
187 | if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) |
185 | return EE_UNSUPPORTED; |
188 | return EE_UNSUPPORTED; |
186 | 189 | ||
187 | a = as_area_create(as, flags, entry->p_memsz, entry->p_vaddr, AS_AREA_ATTR_NONE, |
190 | a = as_area_create(as, flags, entry->p_memsz, entry->p_vaddr, AS_AREA_ATTR_NONE, |
188 | &elf_backend, &backend_data); |
191 | &elf_backend, &backend_data); |
189 | if (!a) |
192 | if (!a) |
190 | return EE_MEMORY; |
193 | return EE_MEMORY; |
191 | 194 | ||
192 | /* |
195 | /* |
193 | * The segment will be mapped on demand by elf_page_fault(). |
196 | * The segment will be mapped on demand by elf_page_fault(). |
194 | */ |
197 | */ |
195 | 198 | ||
196 | return EE_OK; |
199 | return EE_OK; |
197 | } |
200 | } |
198 | 201 | ||
199 | /** Process section header. |
202 | /** Process section header. |
200 | * |
203 | * |
201 | * @param entry Segment header. |
204 | * @param entry Segment header. |
202 | * @param elf ELF header. |
205 | * @param elf ELF header. |
203 | * @param as Address space into wich the ELF is being loaded. |
206 | * @param as Address space into wich the ELF is being loaded. |
204 | * |
207 | * |
205 | * @return EE_OK on success, error code otherwise. |
208 | * @return EE_OK on success, error code otherwise. |
206 | */ |
209 | */ |
207 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as) |
210 | static int section_header(elf_section_header_t *entry, elf_header_t *elf, as_t *as) |
208 | { |
211 | { |
209 | switch (entry->sh_type) { |
212 | switch (entry->sh_type) { |
210 | default: |
213 | default: |
211 | break; |
214 | break; |
212 | } |
215 | } |
213 | 216 | ||
214 | return EE_OK; |
217 | return EE_OK; |
215 | } |
218 | } |
216 | 219 |