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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 | #include <smc.h> |
53 | #include <smc.h> |
54 | #include <loader/pcb.h> |
54 | #include <loader/pcb.h> |
55 | 55 | ||
56 | #include "elf.h" |
56 | #include "elf.h" |
57 | #include "elf_load.h" |
57 | #include "elf_load.h" |
58 | #include "arch.h" |
58 | #include "arch.h" |
59 | 59 | ||
60 | static char *error_codes[] = { |
60 | static char *error_codes[] = { |
61 | "no error", |
61 | "no error", |
62 | "invalid image", |
62 | "invalid image", |
63 | "address space error", |
63 | "address space error", |
64 | "incompatible image", |
64 | "incompatible image", |
65 | "unsupported image type", |
65 | "unsupported image type", |
66 | "irrecoverable error" |
66 | "irrecoverable error" |
67 | }; |
67 | }; |
68 | 68 | ||
69 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias); |
69 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias); |
70 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
70 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
71 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
71 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
72 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
72 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
73 | 73 | ||
74 | /** Load ELF binary from a file. |
74 | /** Load ELF binary from a file. |
75 | * |
75 | * |
76 | * Load an ELF binary from the specified file. If the file is |
76 | * Load an ELF binary from the specified file. If the file is |
77 | * an executable program, it is loaded unbiased. If it is a shared |
77 | * an executable program, it is loaded unbiased. If it is a shared |
78 | * object, it is loaded with the bias @a so_bias. Some information |
78 | * object, it is loaded with the bias @a so_bias. Some information |
79 | * extracted from the binary is stored in a elf_info_t structure |
79 | * extracted from the binary is stored in a elf_info_t structure |
80 | * pointed to by @a info. |
80 | * pointed to by @a info. |
81 | * |
81 | * |
82 | * @param file_name Path to the ELF file. |
82 | * @param file_name Path to the ELF file. |
83 | * @param so_bias Bias to use if the file is a shared object. |
83 | * @param so_bias Bias to use if the file is a shared object. |
84 | * @param info Pointer to a structure for storing information |
84 | * @param info Pointer to a structure for storing information |
85 | * extracted from the binary. |
85 | * extracted from the binary. |
86 | * |
86 | * |
87 | * @return EOK on success or negative error code. |
87 | * @return EOK on success or negative error code. |
88 | */ |
88 | */ |
89 | int elf_load_file(char *file_name, size_t so_bias, elf_info_t *info) |
89 | int elf_load_file(char *file_name, size_t so_bias, elf_info_t *info) |
90 | { |
90 | { |
91 | elf_ld_t elf; |
91 | elf_ld_t elf; |
92 | 92 | ||
93 | int fd; |
93 | int fd; |
94 | int rc; |
94 | int rc; |
95 | 95 | ||
96 | // printf("open and read '%s'...\n", file_name); |
96 | // printf("open and read '%s'...\n", file_name); |
97 | 97 | ||
98 | fd = open(file_name, O_RDONLY); |
98 | fd = open(file_name, O_RDONLY); |
99 | if (fd < 0) { |
99 | if (fd < 0) { |
100 | printf("failed opening file\n"); |
100 | printf("failed opening file\n"); |
101 | return -1; |
101 | return -1; |
102 | } |
102 | } |
103 | 103 | ||
104 | elf.fd = fd; |
104 | elf.fd = fd; |
105 | elf.info = info; |
105 | elf.info = info; |
106 | 106 | ||
107 | rc = elf_load(&elf, so_bias); |
107 | rc = elf_load(&elf, so_bias); |
108 | 108 | ||
109 | close(fd); |
109 | close(fd); |
110 | 110 | ||
111 | return rc; |
111 | return rc; |
112 | } |
112 | } |
113 | 113 | ||
114 | /** Run an ELF executable. |
114 | /** Run an ELF executable. |
115 | * |
115 | * |
116 | * Transfers control to the entry point of an ELF executable loaded |
116 | * Transfers control to the entry point of an ELF executable loaded |
117 | * earlier with elf_load_file(). This function does not return. |
117 | * earlier with elf_load_file(). This function does not return. |
118 | * |
118 | * |
119 | * @param info Info structure filled earlier by elf_load_file() |
119 | * @param info Info structure filled earlier by elf_load_file() |
120 | */ |
120 | */ |
121 | void elf_run(elf_info_t *info, pcb_t *pcb) |
121 | void elf_run(elf_info_t *info, pcb_t *pcb) |
122 | { |
122 | { |
123 | program_run(info->entry, pcb); |
123 | program_run(info->entry, pcb); |
124 | 124 | ||
125 | /* not reached */ |
125 | /* not reached */ |
126 | } |
126 | } |
127 | 127 | ||
128 | /** Create the program control block (PCB). |
128 | /** Create the program control block (PCB). |
129 | * |
129 | * |
130 | * Fills the program control block @a pcb with information from |
130 | * Fills the program control block @a pcb with information from |
131 | * @a info. |
131 | * @a info. |
132 | * |
132 | * |
133 | * @param info Program info structure |
133 | * @param info Program info structure |
134 | * @return EOK on success or negative error code |
134 | * @return EOK on success or negative error code |
135 | */ |
135 | */ |
136 | void elf_create_pcb(elf_info_t *info, pcb_t *pcb) |
136 | void elf_create_pcb(elf_info_t *info, pcb_t *pcb) |
137 | { |
137 | { |
138 | pcb->entry = info->entry; |
138 | pcb->entry = info->entry; |
139 | pcb->dynamic = info->dynamic; |
139 | pcb->dynamic = info->dynamic; |
140 | } |
140 | } |
141 | 141 | ||
142 | 142 | ||
143 | /** Load an ELF binary. |
143 | /** Load an ELF binary. |
144 | * |
144 | * |
145 | * The @a elf structure contains the loader state, including |
145 | * The @a elf structure contains the loader state, including |
146 | * an open file, from which the binary will be loaded, |
146 | * an open file, from which the binary will be loaded, |
147 | * a pointer to the @c info structure etc. |
147 | * a pointer to the @c info structure etc. |
148 | * |
148 | * |
149 | * @param elf Pointer to loader state buffer. |
149 | * @param elf Pointer to loader state buffer. |
150 | * @param so_bias Bias to use if the file is a shared object. |
150 | * @param so_bias Bias to use if the file is a shared object. |
151 | * @return EE_OK on success or EE_xx error code. |
151 | * @return EE_OK on success or EE_xx error code. |
152 | */ |
152 | */ |
153 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
153 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
154 | { |
154 | { |
155 | elf_header_t header_buf; |
155 | elf_header_t header_buf; |
156 | elf_header_t *header = &header_buf; |
156 | elf_header_t *header = &header_buf; |
157 | int i, rc; |
157 | int i, rc; |
158 | 158 | ||
159 | rc = read(elf->fd, header, sizeof(elf_header_t)); |
159 | rc = read(elf->fd, header, sizeof(elf_header_t)); |
160 | if (rc < 0) { |
160 | if (rc < 0) { |
161 | printf("read error\n"); |
161 | printf("read error\n"); |
162 | return EE_INVALID; |
162 | return EE_INVALID; |
163 | } |
163 | } |
164 | 164 | ||
165 | elf->header = header; |
165 | elf->header = header; |
166 | 166 | ||
167 | // printf("ELF-load:"); |
167 | // printf("ELF-load:"); |
168 | /* Identify ELF */ |
168 | /* Identify ELF */ |
169 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
169 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
170 | header->e_ident[EI_MAG1] != ELFMAG1 || |
170 | header->e_ident[EI_MAG1] != ELFMAG1 || |
171 | header->e_ident[EI_MAG2] != ELFMAG2 || |
171 | header->e_ident[EI_MAG2] != ELFMAG2 || |
172 | header->e_ident[EI_MAG3] != ELFMAG3) { |
172 | header->e_ident[EI_MAG3] != ELFMAG3) { |
173 | printf("invalid header\n"); |
173 | printf("invalid header\n"); |
174 | return EE_INVALID; |
174 | return EE_INVALID; |
175 | } |
175 | } |
176 | 176 | ||
177 | /* Identify ELF compatibility */ |
177 | /* Identify ELF compatibility */ |
178 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
178 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
179 | header->e_machine != ELF_MACHINE || |
179 | header->e_machine != ELF_MACHINE || |
180 | header->e_ident[EI_VERSION] != EV_CURRENT || |
180 | header->e_ident[EI_VERSION] != EV_CURRENT || |
181 | header->e_version != EV_CURRENT || |
181 | header->e_version != EV_CURRENT || |
182 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
182 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
183 | printf("incompatible data/version/class\n"); |
183 | printf("incompatible data/version/class\n"); |
184 | return EE_INCOMPATIBLE; |
184 | return EE_INCOMPATIBLE; |
185 | } |
185 | } |
186 | 186 | ||
187 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
187 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
188 | printf("e_phentsize:%d != %d\n", header->e_phentsize, |
188 | printf("e_phentsize:%d != %d\n", header->e_phentsize, |
189 | sizeof(elf_segment_header_t)); |
189 | sizeof(elf_segment_header_t)); |
190 | return EE_INCOMPATIBLE; |
190 | return EE_INCOMPATIBLE; |
191 | } |
191 | } |
192 | 192 | ||
193 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
193 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
194 | printf("e_shentsize:%d != %d\n", header->e_shentsize, |
194 | printf("e_shentsize:%d != %d\n", header->e_shentsize, |
195 | sizeof(elf_section_header_t)); |
195 | sizeof(elf_section_header_t)); |
196 | return EE_INCOMPATIBLE; |
196 | return EE_INCOMPATIBLE; |
197 | } |
197 | } |
198 | 198 | ||
199 | /* Check if the object type is supported. */ |
199 | /* Check if the object type is supported. */ |
200 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
200 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
201 | printf("Object type %d is not supported\n", header->e_type); |
201 | printf("Object type %d is not supported\n", header->e_type); |
202 | return EE_UNSUPPORTED; |
202 | return EE_UNSUPPORTED; |
203 | } |
203 | } |
204 | 204 | ||
205 | /* Shared objects can be loaded with a bias */ |
205 | /* Shared objects can be loaded with a bias */ |
206 | // printf("Object type: %d\n", header->e_type); |
206 | // printf("Object type: %d\n", header->e_type); |
207 | if (header->e_type == ET_DYN) |
207 | if (header->e_type == ET_DYN) |
208 | elf->bias = so_bias; |
208 | elf->bias = so_bias; |
209 | else |
209 | else |
210 | elf->bias = 0; |
210 | elf->bias = 0; |
211 | 211 | ||
212 | // printf("Bias set to 0x%x\n", elf->bias); |
212 | // printf("Bias set to 0x%x\n", elf->bias); |
213 | elf->info->interp = NULL; |
213 | elf->info->interp = NULL; |
214 | elf->info->dynamic = NULL; |
214 | elf->info->dynamic = NULL; |
215 | 215 | ||
216 | // printf("parse segments\n"); |
216 | // printf("parse segments\n"); |
217 | 217 | ||
218 | /* Walk through all segment headers and process them. */ |
218 | /* Walk through all segment headers and process them. */ |
219 | for (i = 0; i < header->e_phnum; i++) { |
219 | for (i = 0; i < header->e_phnum; i++) { |
220 | elf_segment_header_t segment_hdr; |
220 | elf_segment_header_t segment_hdr; |
221 | 221 | ||
222 | /* Seek to start of segment header */ |
222 | /* Seek to start of segment header */ |
223 | lseek(elf->fd, header->e_phoff |
223 | lseek(elf->fd, header->e_phoff |
224 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
224 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
225 | 225 | ||
226 | rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t)); |
226 | rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t)); |
- | 227 | if (rc < 0) { |
|
227 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
228 | printf("read error\n"); |
- | 229 | return EE_INVALID; |
|
- | 230 | } |
|
228 | 231 | ||
229 | rc = segment_header(elf, &segment_hdr); |
232 | rc = segment_header(elf, &segment_hdr); |
230 | if (rc != EE_OK) |
233 | if (rc != EE_OK) |
231 | return rc; |
234 | return rc; |
232 | } |
235 | } |
233 | 236 | ||
234 | // printf("parse sections\n"); |
237 | // printf("parse sections\n"); |
235 | 238 | ||
236 | /* Inspect all section headers and proccess them. */ |
239 | /* Inspect all section headers and proccess them. */ |
237 | for (i = 0; i < header->e_shnum; i++) { |
240 | for (i = 0; i < header->e_shnum; i++) { |
238 | elf_section_header_t section_hdr; |
241 | elf_section_header_t section_hdr; |
239 | 242 | ||
240 | /* Seek to start of section header */ |
243 | /* Seek to start of section header */ |
241 | lseek(elf->fd, header->e_shoff |
244 | lseek(elf->fd, header->e_shoff |
242 | + i * sizeof(elf_section_header_t), SEEK_SET); |
245 | + i * sizeof(elf_section_header_t), SEEK_SET); |
243 | 246 | ||
244 | rc = read(elf->fd, §ion_hdr, sizeof(elf_section_header_t)); |
247 | rc = read(elf->fd, §ion_hdr, sizeof(elf_section_header_t)); |
- | 248 | if (rc < 0) { |
|
245 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
249 | printf("read error\n"); |
- | 250 | return EE_INVALID; |
|
- | 251 | } |
|
246 | 252 | ||
247 | rc = section_header(elf, §ion_hdr); |
253 | rc = section_header(elf, §ion_hdr); |
248 | if (rc != EE_OK) |
254 | if (rc != EE_OK) |
249 | return rc; |
255 | return rc; |
250 | } |
256 | } |
251 | 257 | ||
252 | elf->info->entry = |
258 | elf->info->entry = |
253 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
259 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
254 | 260 | ||
255 | // printf("done\n"); |
261 | // printf("done\n"); |
256 | 262 | ||
257 | return EE_OK; |
263 | return EE_OK; |
258 | } |
264 | } |
259 | 265 | ||
260 | /** Print error message according to error code. |
266 | /** Print error message according to error code. |
261 | * |
267 | * |
262 | * @param rc Return code returned by elf_load(). |
268 | * @param rc Return code returned by elf_load(). |
263 | * |
269 | * |
264 | * @return NULL terminated description of error. |
270 | * @return NULL terminated description of error. |
265 | */ |
271 | */ |
266 | char *elf_error(unsigned int rc) |
272 | char *elf_error(unsigned int rc) |
267 | { |
273 | { |
268 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
274 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
269 | 275 | ||
270 | return error_codes[rc]; |
276 | return error_codes[rc]; |
271 | } |
277 | } |
272 | 278 | ||
273 | /** Process segment header. |
279 | /** Process segment header. |
274 | * |
280 | * |
275 | * @param entry Segment header. |
281 | * @param entry Segment header. |
276 | * |
282 | * |
277 | * @return EE_OK on success, error code otherwise. |
283 | * @return EE_OK on success, error code otherwise. |
278 | */ |
284 | */ |
279 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
285 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
280 | { |
286 | { |
281 | switch (entry->p_type) { |
287 | switch (entry->p_type) { |
282 | case PT_NULL: |
288 | case PT_NULL: |
283 | case PT_PHDR: |
289 | case PT_PHDR: |
284 | break; |
290 | break; |
285 | case PT_LOAD: |
291 | case PT_LOAD: |
286 | return load_segment(elf, entry); |
292 | return load_segment(elf, entry); |
287 | break; |
293 | break; |
288 | case PT_INTERP: |
294 | case PT_INTERP: |
289 | /* Assume silently interp == "/rtld.so" */ |
295 | /* Assume silently interp == "/rtld.so" */ |
290 | elf->info->interp = "/rtld.so"; |
296 | elf->info->interp = "/rtld.so"; |
291 | break; |
297 | break; |
292 | case PT_DYNAMIC: |
298 | case PT_DYNAMIC: |
293 | case PT_SHLIB: |
299 | case PT_SHLIB: |
294 | case PT_NOTE: |
300 | case PT_NOTE: |
295 | case PT_LOPROC: |
301 | case PT_LOPROC: |
296 | case PT_HIPROC: |
302 | case PT_HIPROC: |
297 | default: |
303 | default: |
298 | printf("segment p_type %d unknown\n", entry->p_type); |
304 | printf("segment p_type %d unknown\n", entry->p_type); |
299 | return EE_UNSUPPORTED; |
305 | return EE_UNSUPPORTED; |
300 | break; |
306 | break; |
301 | } |
307 | } |
302 | return EE_OK; |
308 | return EE_OK; |
303 | } |
309 | } |
304 | 310 | ||
305 | /** Load segment described by program header entry. |
311 | /** Load segment described by program header entry. |
306 | * |
312 | * |
307 | * @param elf Loader state. |
313 | * @param elf Loader state. |
308 | * @param entry Program header entry describing segment to be loaded. |
314 | * @param entry Program header entry describing segment to be loaded. |
309 | * |
315 | * |
310 | * @return EE_OK on success, error code otherwise. |
316 | * @return EE_OK on success, error code otherwise. |
311 | */ |
317 | */ |
312 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
318 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
313 | { |
319 | { |
314 | void *a; |
320 | void *a; |
315 | int flags = 0; |
321 | int flags = 0; |
316 | uintptr_t bias; |
322 | uintptr_t bias; |
317 | uintptr_t base; |
323 | uintptr_t base; |
318 | size_t mem_sz; |
324 | size_t mem_sz; |
319 | int rc; |
325 | int rc; |
320 | 326 | ||
321 | // printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
327 | // printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
322 | // entry->p_memsz); |
328 | // entry->p_memsz); |
323 | 329 | ||
324 | bias = elf->bias; |
330 | bias = elf->bias; |
325 | 331 | ||
326 | if (entry->p_align > 1) { |
332 | if (entry->p_align > 1) { |
327 | if ((entry->p_offset % entry->p_align) != |
333 | if ((entry->p_offset % entry->p_align) != |
328 | (entry->p_vaddr % entry->p_align)) { |
334 | (entry->p_vaddr % entry->p_align)) { |
329 | printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n", |
335 | printf("align check 1 failed offset%%align=%d, " |
- | 336 | "vaddr%%align=%d\n", |
|
330 | entry->p_offset % entry->p_align, |
337 | entry->p_offset % entry->p_align, |
331 | entry->p_vaddr % entry->p_align |
338 | entry->p_vaddr % entry->p_align |
332 | ); |
339 | ); |
333 | return EE_INVALID; |
340 | return EE_INVALID; |
334 | } |
341 | } |
335 | } |
342 | } |
336 | 343 | ||
337 | /* Final flags that will be set for the memory area */ |
344 | /* Final flags that will be set for the memory area */ |
338 | 345 | ||
339 | if (entry->p_flags & PF_X) |
346 | if (entry->p_flags & PF_X) |
340 | flags |= AS_AREA_EXEC; |
347 | flags |= AS_AREA_EXEC; |
341 | if (entry->p_flags & PF_W) |
348 | if (entry->p_flags & PF_W) |
342 | flags |= AS_AREA_WRITE; |
349 | flags |= AS_AREA_WRITE; |
343 | if (entry->p_flags & PF_R) |
350 | if (entry->p_flags & PF_R) |
344 | flags |= AS_AREA_READ; |
351 | flags |= AS_AREA_READ; |
345 | flags |= AS_AREA_CACHEABLE; |
352 | flags |= AS_AREA_CACHEABLE; |
346 | 353 | ||
347 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
354 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
348 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
355 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
349 | 356 | ||
350 | // printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias, |
357 | // printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias, |
351 | // entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
358 | // entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
352 | 359 | ||
353 | /* |
360 | /* |
354 | * For the course of loading, the area needs to be readable |
361 | * For the course of loading, the area needs to be readable |
355 | * and writeable. |
362 | * and writeable. |
356 | */ |
363 | */ |
357 | a = as_area_create((uint8_t *)base + bias, |
364 | a = as_area_create((uint8_t *)base + bias, |
358 | mem_sz, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
365 | mem_sz, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
359 | if (a == (void *)(-1)) { |
366 | if (a == (void *)(-1)) { |
360 | printf("memory mapping failed\n"); |
367 | printf("memory mapping failed\n"); |
361 | return EE_MEMORY; |
368 | return EE_MEMORY; |
362 | } |
369 | } |
363 | 370 | ||
364 | // printf("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
371 | // printf("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
365 | // entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
372 | // entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
366 | 373 | ||
367 | /* |
374 | /* |
368 | * Load segment data |
375 | * Load segment data |
369 | */ |
376 | */ |
370 | // printf("seek to %d\n", entry->p_offset); |
377 | // printf("seek to %d\n", entry->p_offset); |
371 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
378 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
- | 379 | if (rc < 0) { |
|
372 | if (rc < 0) { printf("seek error\n"); return EE_INVALID; } |
380 | printf("seek error\n"); |
- | 381 | return EE_INVALID; |
|
- | 382 | } |
|
373 | 383 | ||
374 | // printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
384 | // printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
375 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
385 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
376 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
386 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
377 | 387 | ||
378 | /* Long reads are not possible yet. Load segment picewise */ |
388 | /* Long reads are not possible yet. Load segment picewise */ |
379 | 389 | ||
380 | unsigned left, now; |
390 | unsigned left, now; |
381 | uint8_t *dp; |
391 | uint8_t *dp; |
382 | 392 | ||
383 | left = entry->p_filesz; |
393 | left = entry->p_filesz; |
384 | dp = (uint8_t *)(entry->p_vaddr + bias); |
394 | dp = (uint8_t *)(entry->p_vaddr + bias); |
385 | 395 | ||
386 | while (left > 0) { |
396 | while (left > 0) { |
387 | now = 16384; |
397 | now = 16384; |
388 | if (now > left) now = left; |
398 | if (now > left) now = left; |
389 | 399 | ||
390 | // printf("read %d...", now); |
400 | // printf("read %d...", now); |
391 | rc = read(elf->fd, dp, now); |
401 | rc = read(elf->fd, dp, now); |
392 | // printf("->%d\n", rc); |
402 | // printf("->%d\n", rc); |
393 | 403 | ||
- | 404 | if (rc < 0) { |
|
394 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
405 | printf("read error\n"); |
- | 406 | return EE_INVALID; |
|
- | 407 | } |
|
395 | 408 | ||
396 | left -= now; |
409 | left -= now; |
397 | dp += now; |
410 | dp += now; |
398 | } |
411 | } |
399 | 412 | ||
400 | // printf("set area flags to %d\n", flags); |
413 | // printf("set area flags to %d\n", flags); |
401 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
414 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
402 | if (rc != 0) { |
415 | if (rc != 0) { |
403 | printf("failed to set memory area flags\n"); |
416 | printf("failed to set memory area flags\n"); |
404 | return EE_MEMORY; |
417 | return EE_MEMORY; |
405 | } |
418 | } |
406 | 419 | ||
407 | if (flags & AS_AREA_EXEC) { |
420 | if (flags & AS_AREA_EXEC) { |
408 | /* Enforce SMC coherence for the segment */ |
421 | /* Enforce SMC coherence for the segment */ |
409 | if (smc_coherence(entry->p_vaddr + bias, entry->p_filesz)) |
422 | if (smc_coherence(entry->p_vaddr + bias, entry->p_filesz)) |
410 | return EE_MEMORY; |
423 | return EE_MEMORY; |
411 | } |
424 | } |
412 | 425 | ||
413 | return EE_OK; |
426 | return EE_OK; |
414 | } |
427 | } |
415 | 428 | ||
416 | /** Process section header. |
429 | /** Process section header. |
417 | * |
430 | * |
418 | * @param elf Loader state. |
431 | * @param elf Loader state. |
419 | * @param entry Segment header. |
432 | * @param entry Segment header. |
420 | * |
433 | * |
421 | * @return EE_OK on success, error code otherwise. |
434 | * @return EE_OK on success, error code otherwise. |
422 | */ |
435 | */ |
423 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
436 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
424 | { |
437 | { |
425 | switch (entry->sh_type) { |
438 | switch (entry->sh_type) { |
426 | case SHT_PROGBITS: |
439 | case SHT_PROGBITS: |
427 | if (entry->sh_flags & SHF_TLS) { |
440 | if (entry->sh_flags & SHF_TLS) { |
428 | /* .tdata */ |
441 | /* .tdata */ |
429 | } |
442 | } |
430 | break; |
443 | break; |
431 | case SHT_NOBITS: |
444 | case SHT_NOBITS: |
432 | if (entry->sh_flags & SHF_TLS) { |
445 | if (entry->sh_flags & SHF_TLS) { |
433 | /* .tbss */ |
446 | /* .tbss */ |
434 | } |
447 | } |
435 | break; |
448 | break; |
436 | case SHT_DYNAMIC: |
449 | case SHT_DYNAMIC: |
437 | /* Record pointer to dynamic section into info structure */ |
450 | /* Record pointer to dynamic section into info structure */ |
438 | elf->info->dynamic = |
451 | elf->info->dynamic = |
439 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
452 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
440 | printf("dynamic section found at 0x%x\n", |
453 | printf("dynamic section found at 0x%x\n", |
441 | (uintptr_t)elf->info->dynamic); |
454 | (uintptr_t)elf->info->dynamic); |
442 | break; |
455 | break; |
443 | default: |
456 | default: |
444 | break; |
457 | break; |
445 | } |
458 | } |
446 | 459 | ||
447 | return EE_OK; |
460 | return EE_OK; |
448 | } |
461 | } |
449 | 462 | ||
450 | /** @} |
463 | /** @} |
451 | */ |
464 | */ |
452 | 465 |