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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 | /** Read until the buffer is read in its entirety. */ |
74 | /** Read until the buffer is read in its entirety. */ |
75 | static int my_read(int fd, char *buf, size_t len) |
75 | static int my_read(int fd, char *buf, size_t len) |
76 | { |
76 | { |
77 | int cnt = 0; |
77 | int cnt = 0; |
78 | do { |
78 | do { |
79 | buf += cnt; |
79 | buf += cnt; |
80 | len -= cnt; |
80 | len -= cnt; |
81 | cnt = read(fd, buf, len); |
81 | cnt = read(fd, buf, len); |
82 | } while ((cnt > 0) && ((len - cnt) > 0)); |
82 | } while ((cnt > 0) && ((len - cnt) > 0)); |
83 | 83 | ||
84 | return cnt; |
84 | return cnt; |
85 | } |
85 | } |
86 | 86 | ||
87 | /** Load ELF binary from a file. |
87 | /** Load ELF binary from a file. |
88 | * |
88 | * |
89 | * Load an ELF binary from the specified file. If the file is |
89 | * Load an ELF binary from the specified file. If the file is |
90 | * an executable program, it is loaded unbiased. If it is a shared |
90 | * an executable program, it is loaded unbiased. If it is a shared |
91 | * object, it is loaded with the bias @a so_bias. Some information |
91 | * object, it is loaded with the bias @a so_bias. Some information |
92 | * extracted from the binary is stored in a elf_info_t structure |
92 | * extracted from the binary is stored in a elf_info_t structure |
93 | * pointed to by @a info. |
93 | * pointed to by @a info. |
94 | * |
94 | * |
95 | * @param file_name Path to the ELF file. |
95 | * @param file_name Path to the ELF file. |
96 | * @param so_bias Bias to use if the file is a shared object. |
96 | * @param so_bias Bias to use if the file is a shared object. |
97 | * @param info Pointer to a structure for storing information |
97 | * @param info Pointer to a structure for storing information |
98 | * extracted from the binary. |
98 | * extracted from the binary. |
99 | * |
99 | * |
100 | * @return EOK on success or negative error code. |
100 | * @return EOK on success or negative error code. |
101 | */ |
101 | */ |
102 | int elf_load_file(char *file_name, size_t so_bias, eld_flags_t flags, |
102 | int elf_load_file(char *file_name, size_t so_bias, eld_flags_t flags, |
103 | elf_info_t *info) |
103 | elf_info_t *info) |
104 | { |
104 | { |
105 | elf_ld_t elf; |
105 | elf_ld_t elf; |
106 | 106 | ||
107 | int fd; |
107 | int fd; |
108 | int rc; |
108 | int rc; |
109 | 109 | ||
110 | // printf("open and read '%s'...\n", file_name); |
110 | // printf("open and read '%s'...\n", file_name); |
111 | 111 | ||
112 | fd = open(file_name, O_RDONLY); |
112 | fd = open(file_name, O_RDONLY); |
113 | if (fd < 0) { |
113 | if (fd < 0) { |
114 | printf("failed opening file (error %d)\n", fd); |
114 | printf("failed opening file (error %d)\n", fd); |
115 | return -1; |
115 | return -1; |
116 | } |
116 | } |
117 | 117 | ||
118 | elf.fd = fd; |
118 | elf.fd = fd; |
119 | elf.info = info; |
119 | elf.info = info; |
120 | elf.flags = flags; |
120 | elf.flags = flags; |
121 | 121 | ||
122 | rc = elf_load(&elf, so_bias); |
122 | rc = elf_load(&elf, so_bias); |
123 | 123 | ||
124 | close(fd); |
124 | close(fd); |
125 | 125 | ||
126 | return rc; |
126 | return rc; |
127 | } |
127 | } |
128 | 128 | ||
129 | /** Run an ELF executable. |
129 | /** Run an ELF executable. |
130 | * |
130 | * |
131 | * Transfers control to the entry point of an ELF executable loaded |
131 | * Transfers control to the entry point of an ELF executable loaded |
132 | * earlier with elf_load_file(). This function does not return. |
132 | * earlier with elf_load_file(). This function does not return. |
133 | * |
133 | * |
134 | * @param info Info structure filled earlier by elf_load_file() |
134 | * @param info Info structure filled earlier by elf_load_file() |
135 | */ |
135 | */ |
136 | void elf_run(elf_info_t *info, pcb_t *pcb) |
136 | void elf_run(elf_info_t *info, pcb_t *pcb) |
137 | { |
137 | { |
138 | program_run(info->entry, pcb); |
138 | program_run(info->entry, pcb); |
139 | 139 | ||
140 | /* not reached */ |
140 | /* not reached */ |
141 | } |
141 | } |
142 | 142 | ||
143 | /** Create the program control block (PCB). |
143 | /** Create the program control block (PCB). |
144 | * |
144 | * |
145 | * Fills the program control block @a pcb with information from |
145 | * Fills the program control block @a pcb with information from |
146 | * @a info. |
146 | * @a info. |
147 | * |
147 | * |
148 | * @param info Program info structure |
148 | * @param info Program info structure |
149 | * @return EOK on success or negative error code |
149 | * @return EOK on success or negative error code |
150 | */ |
150 | */ |
151 | void elf_create_pcb(elf_info_t *info, pcb_t *pcb) |
151 | void elf_create_pcb(elf_info_t *info, pcb_t *pcb) |
152 | { |
152 | { |
153 | pcb->entry = info->entry; |
153 | pcb->entry = info->entry; |
154 | pcb->dynamic = info->dynamic; |
154 | pcb->dynamic = info->dynamic; |
155 | } |
155 | } |
156 | 156 | ||
157 | 157 | ||
158 | /** Load an ELF binary. |
158 | /** Load an ELF binary. |
159 | * |
159 | * |
160 | * The @a elf structure contains the loader state, including |
160 | * The @a elf structure contains the loader state, including |
161 | * an open file, from which the binary will be loaded, |
161 | * an open file, from which the binary will be loaded, |
162 | * a pointer to the @c info structure etc. |
162 | * a pointer to the @c info structure etc. |
163 | * |
163 | * |
164 | * @param elf Pointer to loader state buffer. |
164 | * @param elf Pointer to loader state buffer. |
165 | * @param so_bias Bias to use if the file is a shared object. |
165 | * @param so_bias Bias to use if the file is a shared object. |
166 | * @return EE_OK on success or EE_xx error code. |
166 | * @return EE_OK on success or EE_xx error code. |
167 | */ |
167 | */ |
168 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
168 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
169 | { |
169 | { |
170 | elf_header_t header_buf; |
170 | elf_header_t header_buf; |
171 | elf_header_t *header = &header_buf; |
171 | elf_header_t *header = &header_buf; |
172 | int i, rc; |
172 | int i, rc; |
173 | 173 | ||
174 | rc = my_read(elf->fd, header, sizeof(elf_header_t)); |
174 | rc = my_read(elf->fd, header, sizeof(elf_header_t)); |
175 | if (rc < 0) { |
175 | if (rc < 0) { |
176 | printf("read error\n"); |
176 | printf("read error\n"); |
177 | return EE_INVALID; |
177 | return EE_INVALID; |
178 | } |
178 | } |
179 | 179 | ||
180 | elf->header = header; |
180 | elf->header = header; |
181 | 181 | ||
182 | // printf("ELF-load:"); |
182 | // printf("ELF-load:"); |
183 | /* Identify ELF */ |
183 | /* Identify ELF */ |
184 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
184 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
185 | header->e_ident[EI_MAG1] != ELFMAG1 || |
185 | header->e_ident[EI_MAG1] != ELFMAG1 || |
186 | header->e_ident[EI_MAG2] != ELFMAG2 || |
186 | header->e_ident[EI_MAG2] != ELFMAG2 || |
187 | header->e_ident[EI_MAG3] != ELFMAG3) { |
187 | header->e_ident[EI_MAG3] != ELFMAG3) { |
188 | printf("invalid header\n"); |
188 | printf("invalid header\n"); |
189 | return EE_INVALID; |
189 | return EE_INVALID; |
190 | } |
190 | } |
191 | 191 | ||
192 | /* Identify ELF compatibility */ |
192 | /* Identify ELF compatibility */ |
193 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
193 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
194 | header->e_machine != ELF_MACHINE || |
194 | header->e_machine != ELF_MACHINE || |
195 | header->e_ident[EI_VERSION] != EV_CURRENT || |
195 | header->e_ident[EI_VERSION] != EV_CURRENT || |
196 | header->e_version != EV_CURRENT || |
196 | header->e_version != EV_CURRENT || |
197 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
197 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
198 | printf("incompatible data/version/class\n"); |
198 | printf("incompatible data/version/class\n"); |
199 | return EE_INCOMPATIBLE; |
199 | return EE_INCOMPATIBLE; |
200 | } |
200 | } |
201 | 201 | ||
202 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
202 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
203 | printf("e_phentsize:%d != %d\n", header->e_phentsize, |
203 | printf("e_phentsize:%d != %d\n", header->e_phentsize, |
204 | sizeof(elf_segment_header_t)); |
204 | sizeof(elf_segment_header_t)); |
205 | return EE_INCOMPATIBLE; |
205 | return EE_INCOMPATIBLE; |
206 | } |
206 | } |
207 | 207 | ||
208 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
208 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
209 | printf("e_shentsize:%d != %d\n", header->e_shentsize, |
209 | printf("e_shentsize:%d != %d\n", header->e_shentsize, |
210 | sizeof(elf_section_header_t)); |
210 | sizeof(elf_section_header_t)); |
211 | return EE_INCOMPATIBLE; |
211 | return EE_INCOMPATIBLE; |
212 | } |
212 | } |
213 | 213 | ||
214 | /* Check if the object type is supported. */ |
214 | /* Check if the object type is supported. */ |
215 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
215 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
216 | printf("Object type %d is not supported\n", header->e_type); |
216 | printf("Object type %d is not supported\n", header->e_type); |
217 | return EE_UNSUPPORTED; |
217 | return EE_UNSUPPORTED; |
218 | } |
218 | } |
219 | 219 | ||
220 | /* Shared objects can be loaded with a bias */ |
220 | /* Shared objects can be loaded with a bias */ |
221 | // printf("Object type: %d\n", header->e_type); |
221 | // printf("Object type: %d\n", header->e_type); |
222 | if (header->e_type == ET_DYN) |
222 | if (header->e_type == ET_DYN) |
223 | elf->bias = so_bias; |
223 | elf->bias = so_bias; |
224 | else |
224 | else |
225 | elf->bias = 0; |
225 | elf->bias = 0; |
226 | 226 | ||
227 | // printf("Bias set to 0x%x\n", elf->bias); |
227 | // printf("Bias set to 0x%x\n", elf->bias); |
228 | elf->info->interp = NULL; |
228 | elf->info->interp = NULL; |
229 | elf->info->dynamic = NULL; |
229 | elf->info->dynamic = NULL; |
230 | 230 | ||
231 | // printf("parse segments\n"); |
231 | // printf("parse segments\n"); |
232 | 232 | ||
233 | /* Walk through all segment headers and process them. */ |
233 | /* Walk through all segment headers and process them. */ |
234 | for (i = 0; i < header->e_phnum; i++) { |
234 | for (i = 0; i < header->e_phnum; i++) { |
235 | elf_segment_header_t segment_hdr; |
235 | elf_segment_header_t segment_hdr; |
236 | 236 | ||
237 | /* Seek to start of segment header */ |
237 | /* Seek to start of segment header */ |
238 | lseek(elf->fd, header->e_phoff |
238 | lseek(elf->fd, header->e_phoff |
239 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
239 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
240 | 240 | ||
241 | rc = my_read(elf->fd, &segment_hdr, |
241 | rc = my_read(elf->fd, &segment_hdr, |
242 | sizeof(elf_segment_header_t)); |
242 | sizeof(elf_segment_header_t)); |
243 | if (rc < 0) { |
243 | if (rc < 0) { |
244 | printf("read error\n"); |
244 | printf("read error\n"); |
245 | return EE_INVALID; |
245 | return EE_INVALID; |
246 | } |
246 | } |
247 | 247 | ||
248 | rc = segment_header(elf, &segment_hdr); |
248 | rc = segment_header(elf, &segment_hdr); |
249 | if (rc != EE_OK) |
249 | if (rc != EE_OK) |
250 | return rc; |
250 | return rc; |
251 | } |
251 | } |
252 | 252 | ||
253 | // printf("parse sections\n"); |
253 | // printf("parse sections\n"); |
254 | 254 | ||
255 | /* Inspect all section headers and proccess them. */ |
255 | /* Inspect all section headers and proccess them. */ |
256 | for (i = 0; i < header->e_shnum; i++) { |
256 | for (i = 0; i < header->e_shnum; i++) { |
257 | elf_section_header_t section_hdr; |
257 | elf_section_header_t section_hdr; |
258 | 258 | ||
259 | /* Seek to start of section header */ |
259 | /* Seek to start of section header */ |
260 | lseek(elf->fd, header->e_shoff |
260 | lseek(elf->fd, header->e_shoff |
261 | + i * sizeof(elf_section_header_t), SEEK_SET); |
261 | + i * sizeof(elf_section_header_t), SEEK_SET); |
262 | 262 | ||
263 | rc = my_read(elf->fd, §ion_hdr, |
263 | rc = my_read(elf->fd, §ion_hdr, |
264 | sizeof(elf_section_header_t)); |
264 | sizeof(elf_section_header_t)); |
265 | if (rc < 0) { |
265 | if (rc < 0) { |
266 | printf("read error\n"); |
266 | printf("read error\n"); |
267 | return EE_INVALID; |
267 | return EE_INVALID; |
268 | } |
268 | } |
269 | 269 | ||
270 | rc = section_header(elf, §ion_hdr); |
270 | rc = section_header(elf, §ion_hdr); |
271 | if (rc != EE_OK) |
271 | if (rc != EE_OK) |
272 | return rc; |
272 | return rc; |
273 | } |
273 | } |
274 | 274 | ||
275 | elf->info->entry = |
275 | elf->info->entry = |
276 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
276 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
277 | 277 | ||
278 | // printf("done\n"); |
278 | // printf("done\n"); |
279 | 279 | ||
280 | return EE_OK; |
280 | return EE_OK; |
281 | } |
281 | } |
282 | 282 | ||
283 | /** Print error message according to error code. |
283 | /** Print error message according to error code. |
284 | * |
284 | * |
285 | * @param rc Return code returned by elf_load(). |
285 | * @param rc Return code returned by elf_load(). |
286 | * |
286 | * |
287 | * @return NULL terminated description of error. |
287 | * @return NULL terminated description of error. |
288 | */ |
288 | */ |
289 | char *elf_error(unsigned int rc) |
289 | char *elf_error(unsigned int rc) |
290 | { |
290 | { |
291 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
291 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
292 | 292 | ||
293 | return error_codes[rc]; |
293 | return error_codes[rc]; |
294 | } |
294 | } |
295 | 295 | ||
296 | /** Process segment header. |
296 | /** Process segment header. |
297 | * |
297 | * |
298 | * @param entry Segment header. |
298 | * @param entry Segment header. |
299 | * |
299 | * |
300 | * @return EE_OK on success, error code otherwise. |
300 | * @return EE_OK on success, error code otherwise. |
301 | */ |
301 | */ |
302 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
302 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
303 | { |
303 | { |
304 | switch (entry->p_type) { |
304 | switch (entry->p_type) { |
305 | case PT_NULL: |
305 | case PT_NULL: |
306 | case PT_PHDR: |
306 | case PT_PHDR: |
307 | break; |
307 | break; |
308 | case PT_LOAD: |
308 | case PT_LOAD: |
309 | return load_segment(elf, entry); |
309 | return load_segment(elf, entry); |
310 | break; |
310 | break; |
311 | case PT_INTERP: |
311 | case PT_INTERP: |
312 | /* Assume silently interp == "/lib/rtld" */ |
312 | /* Assume silently interp == "/lib/rtld" */ |
313 | elf->info->interp = "/lib/rtld"; |
313 | elf->info->interp = "/lib/rtld"; |
314 | break; |
314 | break; |
315 | case PT_DYNAMIC: |
315 | case PT_DYNAMIC: |
316 | case PT_SHLIB: |
316 | case PT_SHLIB: |
317 | case PT_NOTE: |
317 | case PT_NOTE: |
318 | case PT_LOPROC: |
318 | case PT_LOPROC: |
319 | case PT_HIPROC: |
319 | case PT_HIPROC: |
320 | default: |
320 | default: |
321 | printf("segment p_type %d unknown\n", entry->p_type); |
321 | printf("segment p_type %d unknown\n", entry->p_type); |
322 | return EE_UNSUPPORTED; |
322 | return EE_UNSUPPORTED; |
323 | break; |
323 | break; |
324 | } |
324 | } |
325 | return EE_OK; |
325 | return EE_OK; |
326 | } |
326 | } |
327 | 327 | ||
328 | /** Load segment described by program header entry. |
328 | /** Load segment described by program header entry. |
329 | * |
329 | * |
330 | * @param elf Loader state. |
330 | * @param elf Loader state. |
331 | * @param entry Program header entry describing segment to be loaded. |
331 | * @param entry Program header entry describing segment to be loaded. |
332 | * |
332 | * |
333 | * @return EE_OK on success, error code otherwise. |
333 | * @return EE_OK on success, error code otherwise. |
334 | */ |
334 | */ |
335 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
335 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
336 | { |
336 | { |
337 | void *a; |
337 | void *a; |
338 | int flags = 0; |
338 | int flags = 0; |
339 | uintptr_t bias; |
339 | uintptr_t bias; |
340 | uintptr_t base; |
340 | uintptr_t base; |
341 | size_t mem_sz; |
341 | size_t mem_sz; |
342 | int rc; |
342 | int rc; |
343 | 343 | ||
344 | // printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
344 | // printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
345 | // entry->p_memsz); |
345 | // entry->p_memsz); |
346 | 346 | ||
347 | bias = elf->bias; |
347 | bias = elf->bias; |
348 | 348 | ||
349 | if (entry->p_align > 1) { |
349 | if (entry->p_align > 1) { |
350 | if ((entry->p_offset % entry->p_align) != |
350 | if ((entry->p_offset % entry->p_align) != |
351 | (entry->p_vaddr % entry->p_align)) { |
351 | (entry->p_vaddr % entry->p_align)) { |
352 | printf("align check 1 failed offset%%align=%d, " |
352 | printf("align check 1 failed offset%%align=%d, " |
353 | "vaddr%%align=%d\n", |
353 | "vaddr%%align=%d\n", |
354 | entry->p_offset % entry->p_align, |
354 | entry->p_offset % entry->p_align, |
355 | entry->p_vaddr % entry->p_align |
355 | entry->p_vaddr % entry->p_align |
356 | ); |
356 | ); |
357 | return EE_INVALID; |
357 | return EE_INVALID; |
358 | } |
358 | } |
359 | } |
359 | } |
360 | 360 | ||
361 | /* Final flags that will be set for the memory area */ |
361 | /* Final flags that will be set for the memory area */ |
362 | 362 | ||
363 | if (entry->p_flags & PF_X) |
363 | if (entry->p_flags & PF_X) |
364 | flags |= AS_AREA_EXEC; |
364 | flags |= AS_AREA_EXEC; |
365 | if (entry->p_flags & PF_W) |
365 | if (entry->p_flags & PF_W) |
366 | flags |= AS_AREA_WRITE; |
366 | flags |= AS_AREA_WRITE; |
367 | if (entry->p_flags & PF_R) |
367 | if (entry->p_flags & PF_R) |
368 | flags |= AS_AREA_READ; |
368 | flags |= AS_AREA_READ; |
369 | flags |= AS_AREA_CACHEABLE; |
369 | flags |= AS_AREA_CACHEABLE; |
370 | 370 | ||
371 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
371 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
372 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
372 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
373 | 373 | ||
374 | // printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias, |
374 | // printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias, |
375 | // entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
375 | // entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
376 | 376 | ||
377 | /* |
377 | /* |
378 | * For the course of loading, the area needs to be readable |
378 | * For the course of loading, the area needs to be readable |
379 | * and writeable. |
379 | * and writeable. |
380 | */ |
380 | */ |
381 | a = as_area_create((uint8_t *)base + bias, mem_sz, |
381 | a = as_area_create((uint8_t *)base + bias, mem_sz, |
382 | AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
382 | AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
383 | if (a == (void *)(-1)) { |
383 | if (a == (void *)(-1)) { |
384 | printf("memory mapping failed\n"); |
384 | printf("memory mapping failed\n"); |
385 | return EE_MEMORY; |
385 | return EE_MEMORY; |
386 | } |
386 | } |
387 | 387 | ||
388 | // printf("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
388 | // printf("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
389 | // entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
389 | // entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
390 | 390 | ||
391 | /* |
391 | /* |
392 | * Load segment data |
392 | * Load segment data |
393 | */ |
393 | */ |
394 | // printf("seek to %d\n", entry->p_offset); |
394 | // printf("seek to %d\n", entry->p_offset); |
395 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
395 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
396 | if (rc < 0) { |
396 | if (rc < 0) { |
397 | printf("seek error\n"); |
397 | printf("seek error\n"); |
398 | return EE_INVALID; |
398 | return EE_INVALID; |
399 | } |
399 | } |
400 | 400 | ||
401 | // printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
401 | // printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
402 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
402 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
403 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
403 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
404 | 404 | ||
405 | /* Long reads are not possible yet. Load segment picewise */ |
405 | /* Long reads are not possible yet. Load segment picewise */ |
406 | 406 | ||
407 | unsigned left, now; |
407 | unsigned left, now; |
408 | uint8_t *dp; |
408 | uint8_t *dp; |
409 | 409 | ||
410 | left = entry->p_filesz; |
410 | left = entry->p_filesz; |
411 | dp = (uint8_t *)(entry->p_vaddr + bias); |
411 | dp = (uint8_t *)(entry->p_vaddr + bias); |
412 | 412 | ||
413 | while (left > 0) { |
413 | while (left > 0) { |
414 | now = 16384; |
414 | now = 16384; |
415 | if (now > left) now = left; |
415 | if (now > left) now = left; |
416 | 416 | ||
417 | // printf("read %d...", now); |
417 | // printf("read %d...", now); |
418 | rc = my_read(elf->fd, dp, now); |
418 | rc = my_read(elf->fd, dp, now); |
419 | // printf("->%d\n", rc); |
419 | // printf("->%d\n", rc); |
420 | 420 | ||
421 | if (rc < 0) { |
421 | if (rc < 0) { |
422 | printf("read error\n"); |
422 | printf("read error\n"); |
423 | return EE_INVALID; |
423 | return EE_INVALID; |
424 | } |
424 | } |
425 | 425 | ||
426 | left -= now; |
426 | left -= now; |
427 | dp += now; |
427 | dp += now; |
428 | } |
428 | } |
429 | 429 | ||
430 | /* |
430 | /* |
431 | * The caller wants to modify the segments first. He will then |
431 | * The caller wants to modify the segments first. He will then |
432 | * need to set the right access mode and ensure SMC coherence. |
432 | * need to set the right access mode and ensure SMC coherence. |
433 | */ |
433 | */ |
434 | if ((elf->flags & ELDF_RW) != 0) return EE_OK; |
434 | if ((elf->flags & ELDF_RW) != 0) return EE_OK; |
435 | 435 | ||
436 | printf("set area flags to %d\n", flags); |
436 | // printf("set area flags to %d\n", flags); |
437 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
437 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
438 | if (rc != 0) { |
438 | if (rc != 0) { |
439 | printf("failed to set memory area flags\n"); |
439 | printf("failed to set memory area flags\n"); |
440 | return EE_MEMORY; |
440 | return EE_MEMORY; |
441 | } |
441 | } |
442 | 442 | ||
443 | if (flags & AS_AREA_EXEC) { |
443 | if (flags & AS_AREA_EXEC) { |
444 | /* Enforce SMC coherence for the segment */ |
444 | /* Enforce SMC coherence for the segment */ |
445 | if (smc_coherence(entry->p_vaddr + bias, entry->p_filesz)) |
445 | if (smc_coherence(entry->p_vaddr + bias, entry->p_filesz)) |
446 | return EE_MEMORY; |
446 | return EE_MEMORY; |
447 | } |
447 | } |
448 | 448 | ||
449 | return EE_OK; |
449 | return EE_OK; |
450 | } |
450 | } |
451 | 451 | ||
452 | /** Process section header. |
452 | /** Process section header. |
453 | * |
453 | * |
454 | * @param elf Loader state. |
454 | * @param elf Loader state. |
455 | * @param entry Segment header. |
455 | * @param entry Segment header. |
456 | * |
456 | * |
457 | * @return EE_OK on success, error code otherwise. |
457 | * @return EE_OK on success, error code otherwise. |
458 | */ |
458 | */ |
459 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
459 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
460 | { |
460 | { |
461 | switch (entry->sh_type) { |
461 | switch (entry->sh_type) { |
462 | case SHT_PROGBITS: |
462 | case SHT_PROGBITS: |
463 | if (entry->sh_flags & SHF_TLS) { |
463 | if (entry->sh_flags & SHF_TLS) { |
464 | /* .tdata */ |
464 | /* .tdata */ |
465 | } |
465 | } |
466 | break; |
466 | break; |
467 | case SHT_NOBITS: |
467 | case SHT_NOBITS: |
468 | if (entry->sh_flags & SHF_TLS) { |
468 | if (entry->sh_flags & SHF_TLS) { |
469 | /* .tbss */ |
469 | /* .tbss */ |
470 | } |
470 | } |
471 | break; |
471 | break; |
472 | case SHT_DYNAMIC: |
472 | case SHT_DYNAMIC: |
473 | /* Record pointer to dynamic section into info structure */ |
473 | /* Record pointer to dynamic section into info structure */ |
474 | elf->info->dynamic = |
474 | elf->info->dynamic = |
475 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
475 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
476 | printf("dynamic section found at 0x%x\n", |
476 | printf("dynamic section found at 0x%x\n", |
477 | (uintptr_t)elf->info->dynamic); |
477 | (uintptr_t)elf->info->dynamic); |
478 | break; |
478 | break; |
479 | default: |
479 | default: |
480 | break; |
480 | break; |
481 | } |
481 | } |
482 | 482 | ||
483 | return EE_OK; |
483 | return EE_OK; |
484 | } |
484 | } |
485 | 485 | ||
486 | /** @} |
486 | /** @} |
487 | */ |
487 | */ |
488 | 488 |