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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 | * Copyright (c) 2008 Jiri Svoboda |
4 | * Copyright (c) 2008 Jiri Svoboda |
5 | * All rights reserved. |
5 | * All rights reserved. |
6 | * |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
9 | * are met: |
10 | * |
10 | * |
11 | * - Redistributions of source code must retain the above copyright |
11 | * - Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * - Redistributions in binary form must reproduce the above copyright |
13 | * - Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
15 | * documentation and/or other materials provided with the distribution. |
16 | * - The name of the author may not be used to endorse or promote products |
16 | * - The name of the author may not be used to endorse or promote products |
17 | * derived from this software without specific prior written permission. |
17 | * derived from this software without specific prior written permission. |
18 | * |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 | */ |
29 | */ |
30 | 30 | ||
31 | /** @addtogroup generic |
31 | /** @addtogroup generic |
32 | * @{ |
32 | * @{ |
33 | */ |
33 | */ |
34 | 34 | ||
35 | /** |
35 | /** |
36 | * @file |
36 | * @file |
37 | * @brief Userspace ELF loader. |
37 | * @brief Userspace ELF loader. |
38 | * |
38 | * |
39 | * This module allows loading ELF binaries (both executables and |
39 | * This module allows loading ELF binaries (both executables and |
40 | * shared objects) from VFS. The current implementation allocates |
40 | * shared objects) from VFS. The current implementation allocates |
41 | * anonymous memory, fills it with segment data and then adjusts |
41 | * anonymous memory, fills it with segment data and then adjusts |
42 | * the memory areas' flags to the final value. In the future, |
42 | * the memory areas' flags to the final value. In the future, |
43 | * the segments will be mapped directly from the file. |
43 | * the segments will be mapped directly from the file. |
44 | */ |
44 | */ |
45 | 45 | ||
46 | #include <stdio.h> |
46 | #include <stdio.h> |
47 | #include <sys/types.h> |
47 | #include <sys/types.h> |
48 | #include <align.h> |
48 | #include <align.h> |
49 | #include <assert.h> |
49 | #include <assert.h> |
50 | #include <as.h> |
50 | #include <as.h> |
51 | #include <unistd.h> |
51 | #include <unistd.h> |
52 | #include <fcntl.h> |
52 | #include <fcntl.h> |
53 | 53 | ||
54 | #include "elf.h" |
54 | #include "elf.h" |
55 | #include "pcb.h" |
55 | #include "pcb.h" |
56 | #include "elf_load.h" |
56 | #include "elf_load.h" |
57 | #include "arch.h" |
57 | #include "arch.h" |
58 | 58 | ||
59 | static char *error_codes[] = { |
59 | static char *error_codes[] = { |
60 | "no error", |
60 | "no error", |
61 | "invalid image", |
61 | "invalid image", |
62 | "address space error", |
62 | "address space error", |
63 | "incompatible image", |
63 | "incompatible image", |
64 | "unsupported image type", |
64 | "unsupported image type", |
65 | "irrecoverable error" |
65 | "irrecoverable error" |
66 | }; |
66 | }; |
67 | 67 | ||
68 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias); |
68 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias); |
69 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
69 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
70 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
70 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
71 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
71 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
72 | 72 | ||
73 | /** Load ELF binary from a file. |
73 | /** Load ELF binary from a file. |
74 | * |
74 | * |
75 | * Load an ELF binary from the specified file. If the file is |
75 | * Load an ELF binary from the specified file. If the file is |
76 | * an executable program, it is loaded unbiased. If it is a shared |
76 | * an executable program, it is loaded unbiased. If it is a shared |
77 | * object, it is loaded with the bias @a so_bias. Some information |
77 | * object, it is loaded with the bias @a so_bias. Some information |
78 | * extracted from the binary is stored in a elf_info_t structure |
78 | * extracted from the binary is stored in a elf_info_t structure |
79 | * pointed to by @a info. |
79 | * pointed to by @a info. |
80 | * |
80 | * |
81 | * @param file_name Path to the ELF file. |
81 | * @param file_name Path to the ELF file. |
82 | * @param so_bias Bias to use if the file is a shared object. |
82 | * @param so_bias Bias to use if the file is a shared object. |
83 | * @param info Pointer to a structure for storing information |
83 | * @param info Pointer to a structure for storing information |
84 | * extracted from the binary. |
84 | * extracted from the binary. |
85 | * |
85 | * |
86 | * @return EOK on success or negative error code. |
86 | * @return EOK on success or negative error code. |
87 | */ |
87 | */ |
88 | int elf_load_file(char *file_name, size_t so_bias, elf_info_t *info) |
88 | int elf_load_file(char *file_name, size_t so_bias, elf_info_t *info) |
89 | { |
89 | { |
90 | elf_ld_t elf; |
90 | elf_ld_t elf; |
91 | 91 | ||
92 | int fd; |
92 | int fd; |
93 | int rc; |
93 | int rc; |
94 | 94 | ||
95 | // printf("open and read '%s'...\n", file_name); |
95 | // printf("open and read '%s'...\n", file_name); |
96 | 96 | ||
97 | fd = open(file_name, O_RDONLY); |
97 | fd = open(file_name, O_RDONLY); |
98 | if (fd < 0) { |
98 | if (fd < 0) { |
99 | printf("failed opening file\n"); |
99 | printf("failed opening file\n"); |
100 | return -1; |
100 | return -1; |
101 | } |
101 | } |
102 | 102 | ||
103 | elf.fd = fd; |
103 | elf.fd = fd; |
104 | elf.info = info; |
104 | elf.info = info; |
105 | 105 | ||
106 | rc = elf_load(&elf, so_bias); |
106 | rc = elf_load(&elf, so_bias); |
107 | 107 | ||
108 | close(fd); |
108 | close(fd); |
109 | 109 | ||
110 | return rc; |
110 | return rc; |
111 | } |
111 | } |
112 | 112 | ||
113 | /** Run an ELF executable. |
113 | /** Run an ELF executable. |
114 | * |
114 | * |
115 | * Transfers control to the entry point of an ELF executable loaded |
115 | * Transfers control to the entry point of an ELF executable loaded |
116 | * earlier with elf_load_file(). This function does not return. |
116 | * earlier with elf_load_file(). This function does not return. |
117 | * |
117 | * |
118 | * @param info Info structure filled earlier by elf_load_file() |
118 | * @param info Info structure filled earlier by elf_load_file() |
119 | */ |
119 | */ |
120 | void elf_run(elf_info_t *info) |
120 | void elf_run(elf_info_t *info) |
121 | { |
121 | { |
122 | program_run(info->entry); |
122 | program_run(info->entry); |
123 | 123 | ||
124 | /* not reached */ |
124 | /* not reached */ |
125 | } |
125 | } |
126 | 126 | ||
127 | /** Create the program control block (PCB). |
127 | /** Create the program control block (PCB). |
128 | * |
128 | * |
129 | * Create and install the program control block, initialising it |
129 | * Create and install the program control block, initialising it |
130 | * with program information from @a info. |
130 | * with program information from @a info. |
131 | * |
131 | * |
132 | * @param info Program info structure |
132 | * @param info Program info structure |
133 | * @return EOK on success or negative error code |
133 | * @return EOK on success or negative error code |
134 | */ |
134 | */ |
135 | int elf_create_pcb(elf_info_t *info) |
135 | int elf_create_pcb(elf_info_t *info) |
136 | { |
136 | { |
137 | pcb_t *pcb; |
137 | pcb_t *pcb; |
138 | void *a; |
138 | void *a; |
139 | 139 | ||
140 | pcb = __pcb_get(); |
140 | pcb = __pcb_get(); |
141 | 141 | ||
142 | a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ | AS_AREA_WRITE); |
142 | a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ | AS_AREA_WRITE); |
143 | if (a == (void *)(-1)) { |
143 | if (a == (void *)(-1)) { |
144 | printf("elf_create_pcb: memory mapping failed\n"); |
144 | printf("elf_create_pcb: memory mapping failed\n"); |
145 | return EE_MEMORY; |
145 | return EE_MEMORY; |
146 | } |
146 | } |
147 | 147 | ||
148 | pcb->entry = info->entry; |
148 | pcb->entry = info->entry; |
149 | pcb->dynamic = info->dynamic; |
149 | pcb->dynamic = info->dynamic; |
150 | 150 | ||
151 | return 0; |
151 | return 0; |
152 | } |
152 | } |
153 | 153 | ||
154 | 154 | ||
155 | /** Load an ELF binary. |
155 | /** Load an ELF binary. |
156 | * |
156 | * |
157 | * The @a elf structure contains the loader state, including |
157 | * The @a elf structure contains the loader state, including |
158 | * an open file, from which the binary will be loaded, |
158 | * an open file, from which the binary will be loaded, |
159 | * a pointer to the @c info structure etc. |
159 | * a pointer to the @c info structure etc. |
160 | * |
160 | * |
161 | * @param elf Pointer to loader state buffer. |
161 | * @param elf Pointer to loader state buffer. |
162 | * @param so_bias Bias to use if the file is a shared object. |
162 | * @param so_bias Bias to use if the file is a shared object. |
163 | * @return EE_OK on success or EE_xx error code. |
163 | * @return EE_OK on success or EE_xx error code. |
164 | */ |
164 | */ |
165 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
165 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
166 | { |
166 | { |
167 | elf_header_t header_buf; |
167 | elf_header_t header_buf; |
168 | elf_header_t *header = &header_buf; |
168 | elf_header_t *header = &header_buf; |
169 | int i, rc; |
169 | int i, rc; |
170 | 170 | ||
171 | rc = read(elf->fd, header, sizeof(elf_header_t)); |
171 | rc = read(elf->fd, header, sizeof(elf_header_t)); |
172 | if (rc < 0) { |
172 | if (rc < 0) { |
173 | printf("read error\n"); |
173 | printf("read error\n"); |
174 | return EE_INVALID; |
174 | return EE_INVALID; |
175 | } |
175 | } |
176 | 176 | ||
177 | elf->header = header; |
177 | elf->header = header; |
178 | 178 | ||
179 | // printf("ELF-load:"); |
179 | // printf("ELF-load:"); |
180 | /* Identify ELF */ |
180 | /* Identify ELF */ |
181 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
181 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
182 | header->e_ident[EI_MAG1] != ELFMAG1 || |
182 | header->e_ident[EI_MAG1] != ELFMAG1 || |
183 | header->e_ident[EI_MAG2] != ELFMAG2 || |
183 | header->e_ident[EI_MAG2] != ELFMAG2 || |
184 | header->e_ident[EI_MAG3] != ELFMAG3) { |
184 | header->e_ident[EI_MAG3] != ELFMAG3) { |
185 | printf("invalid header\n"); |
185 | printf("invalid header\n"); |
186 | return EE_INVALID; |
186 | return EE_INVALID; |
187 | } |
187 | } |
188 | 188 | ||
189 | /* Identify ELF compatibility */ |
189 | /* Identify ELF compatibility */ |
190 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
190 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
191 | header->e_machine != ELF_MACHINE || |
191 | header->e_machine != ELF_MACHINE || |
192 | header->e_ident[EI_VERSION] != EV_CURRENT || |
192 | header->e_ident[EI_VERSION] != EV_CURRENT || |
193 | header->e_version != EV_CURRENT || |
193 | header->e_version != EV_CURRENT || |
194 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
194 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
195 | printf("incompatible data/version/class\n"); |
195 | printf("incompatible data/version/class\n"); |
196 | return EE_INCOMPATIBLE; |
196 | return EE_INCOMPATIBLE; |
197 | } |
197 | } |
198 | 198 | ||
199 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
199 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
200 | printf("e_phentsize:%d != %d\n", header->e_phentsize, |
200 | printf("e_phentsize:%d != %d\n", header->e_phentsize, |
201 | sizeof(elf_segment_header_t)); |
201 | sizeof(elf_segment_header_t)); |
202 | return EE_INCOMPATIBLE; |
202 | return EE_INCOMPATIBLE; |
203 | } |
203 | } |
204 | 204 | ||
205 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
205 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
206 | printf("e_shentsize:%d != %d\n", header->e_shentsize, |
206 | printf("e_shentsize:%d != %d\n", header->e_shentsize, |
207 | sizeof(elf_section_header_t)); |
207 | sizeof(elf_section_header_t)); |
208 | return EE_INCOMPATIBLE; |
208 | return EE_INCOMPATIBLE; |
209 | } |
209 | } |
210 | 210 | ||
211 | /* Check if the object type is supported. */ |
211 | /* Check if the object type is supported. */ |
212 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
212 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
213 | printf("Object type %d is not supported\n", header->e_type); |
213 | printf("Object type %d is not supported\n", header->e_type); |
214 | return EE_UNSUPPORTED; |
214 | return EE_UNSUPPORTED; |
215 | } |
215 | } |
216 | 216 | ||
217 | /* Shared objects can be loaded with a bias */ |
217 | /* Shared objects can be loaded with a bias */ |
218 | // printf("Object type: %d\n", header->e_type); |
218 | // printf("Object type: %d\n", header->e_type); |
219 | if (header->e_type == ET_DYN) |
219 | if (header->e_type == ET_DYN) |
220 | elf->bias = so_bias; |
220 | elf->bias = so_bias; |
221 | else |
221 | else |
222 | elf->bias = 0; |
222 | elf->bias = 0; |
223 | 223 | ||
224 | // printf("Bias set to 0x%x\n", elf->bias); |
224 | // printf("Bias set to 0x%x\n", elf->bias); |
225 | elf->info->interp = NULL; |
225 | elf->info->interp = NULL; |
226 | elf->info->dynamic = NULL; |
226 | elf->info->dynamic = NULL; |
227 | 227 | ||
228 | // printf("parse segments\n"); |
228 | // printf("parse segments\n"); |
229 | 229 | ||
230 | /* Walk through all segment headers and process them. */ |
230 | /* Walk through all segment headers and process them. */ |
231 | for (i = 0; i < header->e_phnum; i++) { |
231 | for (i = 0; i < header->e_phnum; i++) { |
232 | elf_segment_header_t segment_hdr; |
232 | elf_segment_header_t segment_hdr; |
233 | 233 | ||
234 | /* Seek to start of segment header */ |
234 | /* Seek to start of segment header */ |
235 | lseek(elf->fd, header->e_phoff |
235 | lseek(elf->fd, header->e_phoff |
236 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
236 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
237 | 237 | ||
238 | rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t)); |
238 | rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t)); |
239 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
239 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
240 | 240 | ||
241 | rc = segment_header(elf, &segment_hdr); |
241 | rc = segment_header(elf, &segment_hdr); |
242 | if (rc != EE_OK) |
242 | if (rc != EE_OK) |
243 | return rc; |
243 | return rc; |
244 | } |
244 | } |
245 | 245 | ||
246 | // printf("parse sections\n"); |
246 | // printf("parse sections\n"); |
247 | 247 | ||
248 | /* Inspect all section headers and proccess them. */ |
248 | /* Inspect all section headers and proccess them. */ |
249 | for (i = 0; i < header->e_shnum; i++) { |
249 | for (i = 0; i < header->e_shnum; i++) { |
250 | elf_section_header_t section_hdr; |
250 | elf_section_header_t section_hdr; |
251 | 251 | ||
252 | /* Seek to start of section header */ |
252 | /* Seek to start of section header */ |
253 | lseek(elf->fd, header->e_shoff |
253 | lseek(elf->fd, header->e_shoff |
254 | + i * sizeof(elf_section_header_t), SEEK_SET); |
254 | + i * sizeof(elf_section_header_t), SEEK_SET); |
255 | 255 | ||
256 | rc = read(elf->fd, §ion_hdr, sizeof(elf_section_header_t)); |
256 | rc = read(elf->fd, §ion_hdr, sizeof(elf_section_header_t)); |
257 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
257 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
258 | 258 | ||
259 | rc = section_header(elf, §ion_hdr); |
259 | rc = section_header(elf, §ion_hdr); |
260 | if (rc != EE_OK) |
260 | if (rc != EE_OK) |
261 | return rc; |
261 | return rc; |
262 | } |
262 | } |
263 | 263 | ||
264 | elf->info->entry = |
264 | elf->info->entry = |
265 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
265 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
266 | 266 | ||
267 | // printf("done\n"); |
267 | // printf("done\n"); |
268 | 268 | ||
269 | return EE_OK; |
269 | return EE_OK; |
270 | } |
270 | } |
271 | 271 | ||
272 | /** Print error message according to error code. |
272 | /** Print error message according to error code. |
273 | * |
273 | * |
274 | * @param rc Return code returned by elf_load(). |
274 | * @param rc Return code returned by elf_load(). |
275 | * |
275 | * |
276 | * @return NULL terminated description of error. |
276 | * @return NULL terminated description of error. |
277 | */ |
277 | */ |
278 | char *elf_error(unsigned int rc) |
278 | char *elf_error(unsigned int rc) |
279 | { |
279 | { |
280 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
280 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
281 | 281 | ||
282 | return error_codes[rc]; |
282 | return error_codes[rc]; |
283 | } |
283 | } |
284 | 284 | ||
285 | /** Process segment header. |
285 | /** Process segment header. |
286 | * |
286 | * |
287 | * @param entry Segment header. |
287 | * @param entry Segment header. |
288 | * |
288 | * |
289 | * @return EE_OK on success, error code otherwise. |
289 | * @return EE_OK on success, error code otherwise. |
290 | */ |
290 | */ |
291 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
291 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
292 | { |
292 | { |
293 | switch (entry->p_type) { |
293 | switch (entry->p_type) { |
294 | case PT_NULL: |
294 | case PT_NULL: |
295 | case PT_PHDR: |
295 | case PT_PHDR: |
296 | break; |
296 | break; |
297 | case PT_LOAD: |
297 | case PT_LOAD: |
298 | return load_segment(elf, entry); |
298 | return load_segment(elf, entry); |
299 | break; |
299 | break; |
300 | case PT_INTERP: |
300 | case PT_INTERP: |
301 | /* Assume silently interp == "/rtld.so" */ |
301 | /* Assume silently interp == "/rtld.so" */ |
302 | elf->info->interp = "/rtld.so"; |
302 | elf->info->interp = "/rtld.so"; |
303 | break; |
303 | break; |
304 | case PT_DYNAMIC: |
304 | case PT_DYNAMIC: |
305 | case PT_SHLIB: |
305 | case PT_SHLIB: |
306 | case PT_NOTE: |
306 | case PT_NOTE: |
307 | case PT_LOPROC: |
307 | case PT_LOPROC: |
308 | case PT_HIPROC: |
308 | case PT_HIPROC: |
309 | default: |
309 | default: |
310 | printf("segment p_type %d unknown\n", entry->p_type); |
310 | printf("segment p_type %d unknown\n", entry->p_type); |
311 | return EE_UNSUPPORTED; |
311 | return EE_UNSUPPORTED; |
312 | break; |
312 | break; |
313 | } |
313 | } |
314 | return EE_OK; |
314 | return EE_OK; |
315 | } |
315 | } |
316 | 316 | ||
317 | /** Load segment described by program header entry. |
317 | /** Load segment described by program header entry. |
318 | * |
318 | * |
319 | * @param elf Loader state. |
319 | * @param elf Loader state. |
320 | * @param entry Program header entry describing segment to be loaded. |
320 | * @param entry Program header entry describing segment to be loaded. |
321 | * |
321 | * |
322 | * @return EE_OK on success, error code otherwise. |
322 | * @return EE_OK on success, error code otherwise. |
323 | */ |
323 | */ |
324 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
324 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
325 | { |
325 | { |
326 | void *a; |
326 | void *a; |
327 | int flags = 0; |
327 | int flags = 0; |
328 | uintptr_t bias; |
328 | uintptr_t bias; |
329 | uintptr_t base; |
329 | uintptr_t base; |
330 | size_t mem_sz; |
330 | size_t mem_sz; |
331 | int rc; |
331 | int rc; |
332 | 332 | ||
333 | // printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
333 | // printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
334 | // entry->p_memsz); |
334 | // entry->p_memsz); |
335 | 335 | ||
336 | bias = elf->bias; |
336 | bias = elf->bias; |
337 | 337 | ||
338 | if (entry->p_align > 1) { |
338 | if (entry->p_align > 1) { |
339 | if ((entry->p_offset % entry->p_align) != |
339 | if ((entry->p_offset % entry->p_align) != |
340 | (entry->p_vaddr % entry->p_align)) { |
340 | (entry->p_vaddr % entry->p_align)) { |
341 | printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n", |
341 | printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n", |
342 | entry->p_offset % entry->p_align, |
342 | entry->p_offset % entry->p_align, |
343 | entry->p_vaddr % entry->p_align |
343 | entry->p_vaddr % entry->p_align |
344 | ); |
344 | ); |
345 | return EE_INVALID; |
345 | return EE_INVALID; |
346 | } |
346 | } |
347 | } |
347 | } |
348 | 348 | ||
349 | /* Final flags that will be set for the memory area */ |
349 | /* Final flags that will be set for the memory area */ |
350 | 350 | ||
351 | if (entry->p_flags & PF_X) |
351 | if (entry->p_flags & PF_X) |
352 | flags |= AS_AREA_EXEC; |
352 | flags |= AS_AREA_EXEC; |
353 | if (entry->p_flags & PF_W) |
353 | if (entry->p_flags & PF_W) |
354 | flags |= AS_AREA_WRITE; |
354 | flags |= AS_AREA_WRITE; |
355 | if (entry->p_flags & PF_R) |
355 | if (entry->p_flags & PF_R) |
356 | flags |= AS_AREA_READ; |
356 | flags |= AS_AREA_READ; |
357 | flags |= AS_AREA_CACHEABLE; |
357 | flags |= AS_AREA_CACHEABLE; |
358 | 358 | ||
359 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
359 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
360 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
360 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
361 | 361 | ||
362 | // printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias, |
362 | // printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias, |
363 | // entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
363 | // entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
364 | 364 | ||
365 | /* |
365 | /* |
366 | * For the course of loading, the area needs to be readable |
366 | * For the course of loading, the area needs to be readable |
367 | * and writeable. |
367 | * and writeable. |
368 | */ |
368 | */ |
369 | a = as_area_create((uint8_t *)base + bias, |
369 | a = as_area_create((uint8_t *)base + bias, |
370 | mem_sz, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
370 | mem_sz, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
371 | if (a == (void *)(-1)) { |
371 | if (a == (void *)(-1)) { |
372 | printf("memory mapping failed\n"); |
372 | printf("memory mapping failed\n"); |
373 | return EE_MEMORY; |
373 | return EE_MEMORY; |
374 | } |
374 | } |
375 | 375 | ||
376 | // printf("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
376 | // printf("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
377 | // entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
377 | // entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
378 | 378 | ||
379 | /* |
379 | /* |
380 | * Load segment data |
380 | * Load segment data |
381 | */ |
381 | */ |
382 | // printf("seek to %d\n", entry->p_offset); |
382 | // printf("seek to %d\n", entry->p_offset); |
383 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
383 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
384 | if (rc < 0) { printf("seek error\n"); return EE_INVALID; } |
384 | if (rc < 0) { printf("seek error\n"); return EE_INVALID; } |
385 | 385 | ||
386 | // printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
386 | // printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
387 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
387 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
388 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
388 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
389 | 389 | ||
390 | /* Long reads are not possible yet. Load segment picewise */ |
390 | /* Long reads are not possible yet. Load segment picewise */ |
391 | 391 | ||
392 | unsigned left, now; |
392 | unsigned left, now; |
393 | uint8_t *dp; |
393 | uint8_t *dp; |
394 | 394 | ||
395 | left = entry->p_filesz; |
395 | left = entry->p_filesz; |
396 | dp = (uint8_t *)(entry->p_vaddr + bias); |
396 | dp = (uint8_t *)(entry->p_vaddr + bias); |
397 | 397 | ||
398 | while (left > 0) { |
398 | while (left > 0) { |
399 | now = 16384; |
399 | now = 16384; |
400 | if (now > left) now = left; |
400 | if (now > left) now = left; |
401 | 401 | ||
402 | // printf("read %d...", now); |
402 | // printf("read %d...", now); |
403 | rc = read(elf->fd, dp, now); |
403 | rc = read(elf->fd, dp, now); |
404 | // printf("->%d\n", rc); |
404 | // printf("->%d\n", rc); |
405 | 405 | ||
406 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
406 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
407 | 407 | ||
408 | left -= now; |
408 | left -= now; |
409 | dp += now; |
409 | dp += now; |
410 | } |
410 | } |
411 | 411 | ||
412 | // printf("set area flags to %d\n", flags); |
412 | // printf("set area flags to %d\n", flags); |
413 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
413 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
414 | if (rc != 0) { |
414 | if (rc != 0) { |
415 | printf("failed to set memory area flags\n"); |
415 | printf("failed to set memory area flags\n"); |
416 | return EE_MEMORY; |
416 | return EE_MEMORY; |
417 | } |
417 | } |
418 | 418 | ||
419 | return EE_OK; |
419 | return EE_OK; |
420 | } |
420 | } |
421 | 421 | ||
422 | /** Process section header. |
422 | /** Process section header. |
423 | * |
423 | * |
424 | * @param elf Loader state. |
424 | * @param elf Loader state. |
425 | * @param entry Segment header. |
425 | * @param entry Segment header. |
426 | * |
426 | * |
427 | * @return EE_OK on success, error code otherwise. |
427 | * @return EE_OK on success, error code otherwise. |
428 | */ |
428 | */ |
429 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
429 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
430 | { |
430 | { |
431 | switch (entry->sh_type) { |
431 | switch (entry->sh_type) { |
432 | case SHT_PROGBITS: |
432 | case SHT_PROGBITS: |
433 | if (entry->sh_flags & SHF_TLS) { |
433 | if (entry->sh_flags & SHF_TLS) { |
434 | /* .tdata */ |
434 | /* .tdata */ |
435 | } |
435 | } |
436 | break; |
436 | break; |
437 | case SHT_NOBITS: |
437 | case SHT_NOBITS: |
438 | if (entry->sh_flags & SHF_TLS) { |
438 | if (entry->sh_flags & SHF_TLS) { |
439 | /* .tbss */ |
439 | /* .tbss */ |
440 | } |
440 | } |
441 | break; |
441 | break; |
442 | case SHT_DYNAMIC: |
442 | case SHT_DYNAMIC: |
443 | /* Record pointer to dynamic section into info structure */ |
443 | /* Record pointer to dynamic section into info structure */ |
444 | elf->info->dynamic = |
444 | elf->info->dynamic = |
445 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
445 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
446 | printf("dynamic section found at 0x%x\n", |
446 | printf("dynamic section found at 0x%x\n", |
447 | (uintptr_t)elf->info->dynamic); |
447 | (uintptr_t)elf->info->dynamic); |
448 | break; |
448 | break; |
449 | default: |
449 | default: |
450 | break; |
450 | break; |
451 | } |
451 | } |
452 | 452 | ||
453 | return EE_OK; |
453 | return EE_OK; |
454 | } |
454 | } |
455 | 455 | ||
456 | /** @} |
456 | /** @} |
457 | */ |
457 | */ |
458 | 458 |