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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 | #define DPRINTF(...) |
60 | #define DPRINTF(...) |
61 | 61 | ||
62 | static char *error_codes[] = { |
62 | static char *error_codes[] = { |
63 | "no error", |
63 | "no error", |
64 | "invalid image", |
64 | "invalid image", |
65 | "address space error", |
65 | "address space error", |
66 | "incompatible image", |
66 | "incompatible image", |
67 | "unsupported image type", |
67 | "unsupported image type", |
68 | "irrecoverable error" |
68 | "irrecoverable error" |
69 | }; |
69 | }; |
70 | 70 | ||
71 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias); |
71 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias); |
72 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
72 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
73 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
73 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
74 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
74 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
75 | 75 | ||
76 | /** Read until the buffer is read in its entirety. */ |
76 | /** Read until the buffer is read in its entirety. */ |
77 | static int my_read(int fd, char *buf, size_t len) |
77 | static int my_read(int fd, void *buf, size_t len) |
78 | { |
78 | { |
79 | int cnt = 0; |
79 | int cnt = 0; |
80 | do { |
80 | do { |
81 | buf += cnt; |
81 | buf += cnt; |
82 | len -= cnt; |
82 | len -= cnt; |
83 | cnt = read(fd, buf, len); |
83 | cnt = read(fd, buf, len); |
84 | } while ((cnt > 0) && ((len - cnt) > 0)); |
84 | } while ((cnt > 0) && ((len - cnt) > 0)); |
85 | 85 | ||
86 | return cnt; |
86 | return cnt; |
87 | } |
87 | } |
88 | 88 | ||
89 | /** Load ELF binary from a file. |
89 | /** Load ELF binary from a file. |
90 | * |
90 | * |
91 | * Load an ELF binary from the specified file. If the file is |
91 | * Load an ELF binary from the specified file. If the file is |
92 | * an executable program, it is loaded unbiased. If it is a shared |
92 | * an executable program, it is loaded unbiased. If it is a shared |
93 | * object, it is loaded with the bias @a so_bias. Some information |
93 | * object, it is loaded with the bias @a so_bias. Some information |
94 | * extracted from the binary is stored in a elf_info_t structure |
94 | * extracted from the binary is stored in a elf_info_t structure |
95 | * pointed to by @a info. |
95 | * pointed to by @a info. |
96 | * |
96 | * |
97 | * @param file_name Path to the ELF file. |
97 | * @param file_name Path to the ELF file. |
98 | * @param so_bias Bias to use if the file is a shared object. |
98 | * @param so_bias Bias to use if the file is a shared object. |
99 | * @param info Pointer to a structure for storing information |
99 | * @param info Pointer to a structure for storing information |
100 | * extracted from the binary. |
100 | * extracted from the binary. |
101 | * |
101 | * |
102 | * @return EOK on success or negative error code. |
102 | * @return EOK on success or negative error code. |
103 | */ |
103 | */ |
104 | int elf_load_file(char *file_name, size_t so_bias, eld_flags_t flags, |
104 | int elf_load_file(char *file_name, size_t so_bias, eld_flags_t flags, |
105 | elf_info_t *info) |
105 | elf_info_t *info) |
106 | { |
106 | { |
107 | elf_ld_t elf; |
107 | elf_ld_t elf; |
108 | 108 | ||
109 | int fd; |
109 | int fd; |
110 | int rc; |
110 | int rc; |
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 | DPRINTF("failed opening file\n"); |
114 | DPRINTF("failed opening file\n"); |
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 | /** Create the program control block (PCB). |
129 | /** Create the program control block (PCB). |
130 | * |
130 | * |
131 | * Fills the program control block @a pcb with information from |
131 | * Fills the program control block @a pcb with information from |
132 | * @a info. |
132 | * @a info. |
133 | * |
133 | * |
134 | * @param info Program info structure |
134 | * @param info Program info structure |
135 | * @return EOK on success or negative error code |
135 | * @return EOK on success or negative error code |
136 | */ |
136 | */ |
137 | void elf_create_pcb(elf_info_t *info, pcb_t *pcb) |
137 | void elf_create_pcb(elf_info_t *info, pcb_t *pcb) |
138 | { |
138 | { |
139 | pcb->entry = info->entry; |
139 | pcb->entry = info->entry; |
140 | pcb->dynamic = info->dynamic; |
140 | pcb->dynamic = info->dynamic; |
141 | pcb->rtld_runtime = NULL; |
141 | pcb->rtld_runtime = NULL; |
142 | } |
142 | } |
143 | 143 | ||
144 | 144 | ||
145 | /** Load an ELF binary. |
145 | /** Load an ELF binary. |
146 | * |
146 | * |
147 | * The @a elf structure contains the loader state, including |
147 | * The @a elf structure contains the loader state, including |
148 | * an open file, from which the binary will be loaded, |
148 | * an open file, from which the binary will be loaded, |
149 | * a pointer to the @c info structure etc. |
149 | * a pointer to the @c info structure etc. |
150 | * |
150 | * |
151 | * @param elf Pointer to loader state buffer. |
151 | * @param elf Pointer to loader state buffer. |
152 | * @param so_bias Bias to use if the file is a shared object. |
152 | * @param so_bias Bias to use if the file is a shared object. |
153 | * @return EE_OK on success or EE_xx error code. |
153 | * @return EE_OK on success or EE_xx error code. |
154 | */ |
154 | */ |
155 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
155 | static unsigned int elf_load(elf_ld_t *elf, size_t so_bias) |
156 | { |
156 | { |
157 | elf_header_t header_buf; |
157 | elf_header_t header_buf; |
158 | elf_header_t *header = &header_buf; |
158 | elf_header_t *header = &header_buf; |
159 | int i, rc; |
159 | int i, rc; |
160 | 160 | ||
161 | rc = my_read(elf->fd, header, sizeof(elf_header_t)); |
161 | rc = my_read(elf->fd, header, sizeof(elf_header_t)); |
162 | if (rc < 0) { |
162 | if (rc < 0) { |
163 | DPRINTF("Read error.\n"); |
163 | DPRINTF("Read error.\n"); |
164 | return EE_INVALID; |
164 | return EE_INVALID; |
165 | } |
165 | } |
166 | 166 | ||
167 | elf->header = header; |
167 | elf->header = header; |
168 | 168 | ||
169 | /* Identify ELF */ |
169 | /* Identify ELF */ |
170 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
170 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
171 | header->e_ident[EI_MAG1] != ELFMAG1 || |
171 | header->e_ident[EI_MAG1] != ELFMAG1 || |
172 | header->e_ident[EI_MAG2] != ELFMAG2 || |
172 | header->e_ident[EI_MAG2] != ELFMAG2 || |
173 | header->e_ident[EI_MAG3] != ELFMAG3) { |
173 | header->e_ident[EI_MAG3] != ELFMAG3) { |
174 | DPRINTF("Invalid header.\n"); |
174 | DPRINTF("Invalid header.\n"); |
175 | return EE_INVALID; |
175 | return EE_INVALID; |
176 | } |
176 | } |
177 | 177 | ||
178 | /* Identify ELF compatibility */ |
178 | /* Identify ELF compatibility */ |
179 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
179 | if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING || |
180 | header->e_machine != ELF_MACHINE || |
180 | header->e_machine != ELF_MACHINE || |
181 | header->e_ident[EI_VERSION] != EV_CURRENT || |
181 | header->e_ident[EI_VERSION] != EV_CURRENT || |
182 | header->e_version != EV_CURRENT || |
182 | header->e_version != EV_CURRENT || |
183 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
183 | header->e_ident[EI_CLASS] != ELF_CLASS) { |
184 | DPRINTF("Incompatible data/version/class.\n"); |
184 | DPRINTF("Incompatible data/version/class.\n"); |
185 | return EE_INCOMPATIBLE; |
185 | return EE_INCOMPATIBLE; |
186 | } |
186 | } |
187 | 187 | ||
188 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
188 | if (header->e_phentsize != sizeof(elf_segment_header_t)) { |
189 | DPRINTF("e_phentsize:%d != %d\n", header->e_phentsize, |
189 | DPRINTF("e_phentsize:%d != %d\n", header->e_phentsize, |
190 | sizeof(elf_segment_header_t)); |
190 | sizeof(elf_segment_header_t)); |
191 | return EE_INCOMPATIBLE; |
191 | return EE_INCOMPATIBLE; |
192 | } |
192 | } |
193 | 193 | ||
194 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
194 | if (header->e_shentsize != sizeof(elf_section_header_t)) { |
195 | DPRINTF("e_shentsize:%d != %d\n", header->e_shentsize, |
195 | DPRINTF("e_shentsize:%d != %d\n", header->e_shentsize, |
196 | sizeof(elf_section_header_t)); |
196 | sizeof(elf_section_header_t)); |
197 | return EE_INCOMPATIBLE; |
197 | return EE_INCOMPATIBLE; |
198 | } |
198 | } |
199 | 199 | ||
200 | /* Check if the object type is supported. */ |
200 | /* Check if the object type is supported. */ |
201 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
201 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
202 | DPRINTF("Object type %d is not supported\n", header->e_type); |
202 | DPRINTF("Object type %d is not supported\n", header->e_type); |
203 | return EE_UNSUPPORTED; |
203 | return EE_UNSUPPORTED; |
204 | } |
204 | } |
205 | 205 | ||
206 | /* Shared objects can be loaded with a bias */ |
206 | /* Shared objects can be loaded with a bias */ |
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 | elf->info->interp = NULL; |
212 | elf->info->interp = NULL; |
213 | elf->info->dynamic = NULL; |
213 | elf->info->dynamic = NULL; |
214 | 214 | ||
215 | /* Walk through all segment headers and process them. */ |
215 | /* Walk through all segment headers and process them. */ |
216 | for (i = 0; i < header->e_phnum; i++) { |
216 | for (i = 0; i < header->e_phnum; i++) { |
217 | elf_segment_header_t segment_hdr; |
217 | elf_segment_header_t segment_hdr; |
218 | 218 | ||
219 | /* Seek to start of segment header */ |
219 | /* Seek to start of segment header */ |
220 | lseek(elf->fd, header->e_phoff |
220 | lseek(elf->fd, header->e_phoff |
221 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
221 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
222 | 222 | ||
223 | rc = my_read(elf->fd, &segment_hdr, |
223 | rc = my_read(elf->fd, &segment_hdr, |
224 | sizeof(elf_segment_header_t)); |
224 | sizeof(elf_segment_header_t)); |
225 | if (rc < 0) { |
225 | if (rc < 0) { |
226 | DPRINTF("Read error.\n"); |
226 | DPRINTF("Read error.\n"); |
227 | return EE_INVALID; |
227 | return EE_INVALID; |
228 | } |
228 | } |
229 | 229 | ||
230 | rc = segment_header(elf, &segment_hdr); |
230 | rc = segment_header(elf, &segment_hdr); |
231 | if (rc != EE_OK) |
231 | if (rc != EE_OK) |
232 | return rc; |
232 | return rc; |
233 | } |
233 | } |
234 | 234 | ||
235 | DPRINTF("Parse sections.\n"); |
235 | DPRINTF("Parse sections.\n"); |
236 | 236 | ||
237 | /* Inspect all section headers and proccess them. */ |
237 | /* Inspect all section headers and proccess them. */ |
238 | for (i = 0; i < header->e_shnum; i++) { |
238 | for (i = 0; i < header->e_shnum; i++) { |
239 | elf_section_header_t section_hdr; |
239 | elf_section_header_t section_hdr; |
240 | 240 | ||
241 | /* Seek to start of section header */ |
241 | /* Seek to start of section header */ |
242 | lseek(elf->fd, header->e_shoff |
242 | lseek(elf->fd, header->e_shoff |
243 | + i * sizeof(elf_section_header_t), SEEK_SET); |
243 | + i * sizeof(elf_section_header_t), SEEK_SET); |
244 | 244 | ||
245 | rc = my_read(elf->fd, §ion_hdr, |
245 | rc = my_read(elf->fd, §ion_hdr, |
246 | sizeof(elf_section_header_t)); |
246 | sizeof(elf_section_header_t)); |
247 | if (rc < 0) { |
247 | if (rc < 0) { |
248 | DPRINTF("Read error.\n"); |
248 | DPRINTF("Read error.\n"); |
249 | return EE_INVALID; |
249 | return EE_INVALID; |
250 | } |
250 | } |
251 | 251 | ||
252 | rc = section_header(elf, §ion_hdr); |
252 | rc = section_header(elf, §ion_hdr); |
253 | if (rc != EE_OK) |
253 | if (rc != EE_OK) |
254 | return rc; |
254 | return rc; |
255 | } |
255 | } |
256 | 256 | ||
257 | elf->info->entry = |
257 | elf->info->entry = |
258 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
258 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
259 | 259 | ||
260 | DPRINTF("Done.\n"); |
260 | DPRINTF("Done.\n"); |
261 | 261 | ||
262 | return EE_OK; |
262 | return EE_OK; |
263 | } |
263 | } |
264 | 264 | ||
265 | /** Print error message according to error code. |
265 | /** Print error message according to error code. |
266 | * |
266 | * |
267 | * @param rc Return code returned by elf_load(). |
267 | * @param rc Return code returned by elf_load(). |
268 | * |
268 | * |
269 | * @return NULL terminated description of error. |
269 | * @return NULL terminated description of error. |
270 | */ |
270 | */ |
271 | char *elf_error(unsigned int rc) |
271 | char *elf_error(unsigned int rc) |
272 | { |
272 | { |
273 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
273 | assert(rc < sizeof(error_codes) / sizeof(char *)); |
274 | 274 | ||
275 | return error_codes[rc]; |
275 | return error_codes[rc]; |
276 | } |
276 | } |
277 | 277 | ||
278 | /** Process segment header. |
278 | /** Process segment header. |
279 | * |
279 | * |
280 | * @param entry Segment header. |
280 | * @param entry Segment header. |
281 | * |
281 | * |
282 | * @return EE_OK on success, error code otherwise. |
282 | * @return EE_OK on success, error code otherwise. |
283 | */ |
283 | */ |
284 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
284 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
285 | { |
285 | { |
286 | switch (entry->p_type) { |
286 | switch (entry->p_type) { |
287 | case PT_NULL: |
287 | case PT_NULL: |
288 | case PT_PHDR: |
288 | case PT_PHDR: |
289 | break; |
289 | break; |
290 | case PT_LOAD: |
290 | case PT_LOAD: |
291 | return load_segment(elf, entry); |
291 | return load_segment(elf, entry); |
292 | break; |
292 | break; |
293 | case PT_INTERP: |
293 | case PT_INTERP: |
294 | /* Assume silently interp == "/app/dload" */ |
294 | /* Assume silently interp == "/app/dload" */ |
295 | elf->info->interp = "/app/dload"; |
295 | elf->info->interp = "/app/dload"; |
296 | break; |
296 | break; |
297 | case PT_DYNAMIC: |
297 | case PT_DYNAMIC: |
298 | /* Record pointer to dynamic section into info structure */ |
298 | /* Record pointer to dynamic section into info structure */ |
299 | elf->info->dynamic = |
299 | elf->info->dynamic = |
300 | (void *)((uint8_t *)entry->p_vaddr + elf->bias); |
300 | (void *)((uint8_t *)entry->p_vaddr + elf->bias); |
301 | DPRINTF("dynamic section found at 0x%x\n", |
301 | DPRINTF("dynamic section found at 0x%x\n", |
302 | (uintptr_t)elf->info->dynamic); |
302 | (uintptr_t)elf->info->dynamic); |
303 | break; |
303 | break; |
304 | case 0x70000000: |
304 | case 0x70000000: |
305 | /* FIXME: MIPS reginfo */ |
305 | /* FIXME: MIPS reginfo */ |
306 | break; |
306 | break; |
307 | case PT_SHLIB: |
307 | case PT_SHLIB: |
308 | case PT_NOTE: |
308 | case PT_NOTE: |
309 | // case PT_LOPROC: |
309 | // case PT_LOPROC: |
310 | // case PT_HIPROC: |
310 | // case PT_HIPROC: |
311 | default: |
311 | default: |
312 | DPRINTF("Segment p_type %d unknown.\n", entry->p_type); |
312 | DPRINTF("Segment p_type %d unknown.\n", entry->p_type); |
313 | return EE_UNSUPPORTED; |
313 | return EE_UNSUPPORTED; |
314 | break; |
314 | break; |
315 | } |
315 | } |
316 | return EE_OK; |
316 | return EE_OK; |
317 | } |
317 | } |
318 | 318 | ||
319 | /** Load segment described by program header entry. |
319 | /** Load segment described by program header entry. |
320 | * |
320 | * |
321 | * @param elf Loader state. |
321 | * @param elf Loader state. |
322 | * @param entry Program header entry describing segment to be loaded. |
322 | * @param entry Program header entry describing segment to be loaded. |
323 | * |
323 | * |
324 | * @return EE_OK on success, error code otherwise. |
324 | * @return EE_OK on success, error code otherwise. |
325 | */ |
325 | */ |
326 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
326 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
327 | { |
327 | { |
328 | void *a; |
328 | void *a; |
329 | int flags = 0; |
329 | int flags = 0; |
330 | uintptr_t bias; |
330 | uintptr_t bias; |
331 | uintptr_t base; |
331 | uintptr_t base; |
- | 332 | void *seg_ptr; |
|
- | 333 | uintptr_t seg_addr; |
|
332 | size_t mem_sz; |
334 | size_t mem_sz; |
333 | int rc; |
335 | int rc; |
334 | 336 | ||
335 | DPRINTF("Load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
- | |
336 | entry->p_memsz); |
- | |
337 | - | ||
338 | bias = elf->bias; |
337 | bias = elf->bias; |
339 | 338 | ||
- | 339 | seg_addr = entry->p_vaddr + bias; |
|
- | 340 | seg_ptr = (void *) seg_addr; |
|
- | 341 | ||
- | 342 | DPRINTF("Load segment at addr 0x%x, size 0x%x\n", seg_addr, |
|
- | 343 | entry->p_memsz); |
|
- | 344 | ||
340 | if (entry->p_align > 1) { |
345 | if (entry->p_align > 1) { |
341 | if ((entry->p_offset % entry->p_align) != |
346 | if ((entry->p_offset % entry->p_align) != |
342 | (entry->p_vaddr % entry->p_align)) { |
347 | (seg_addr % entry->p_align)) { |
343 | DPRINTF("Align check 1 failed offset%%align=%d, " |
348 | DPRINTF("Align check 1 failed offset%%align=%d, " |
344 | "vaddr%%align=%d\n", |
349 | "vaddr%%align=%d\n", |
345 | entry->p_offset % entry->p_align, |
350 | entry->p_offset % entry->p_align, |
346 | entry->p_vaddr % entry->p_align |
351 | seg_addr % entry->p_align |
347 | ); |
352 | ); |
348 | return EE_INVALID; |
353 | return EE_INVALID; |
349 | } |
354 | } |
350 | } |
355 | } |
351 | 356 | ||
352 | /* Final flags that will be set for the memory area */ |
357 | /* Final flags that will be set for the memory area */ |
353 | 358 | ||
354 | if (entry->p_flags & PF_X) |
359 | if (entry->p_flags & PF_X) |
355 | flags |= AS_AREA_EXEC; |
360 | flags |= AS_AREA_EXEC; |
356 | if (entry->p_flags & PF_W) |
361 | if (entry->p_flags & PF_W) |
357 | flags |= AS_AREA_WRITE; |
362 | flags |= AS_AREA_WRITE; |
358 | if (entry->p_flags & PF_R) |
363 | if (entry->p_flags & PF_R) |
359 | flags |= AS_AREA_READ; |
364 | flags |= AS_AREA_READ; |
360 | flags |= AS_AREA_CACHEABLE; |
365 | flags |= AS_AREA_CACHEABLE; |
361 | 366 | ||
362 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
367 | base = ALIGN_DOWN(entry->p_vaddr, PAGE_SIZE); |
363 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
368 | mem_sz = entry->p_memsz + (entry->p_vaddr - base); |
364 | 369 | ||
365 | DPRINTF("Map to p_vaddr=0x%x-0x%x.\n", entry->p_vaddr + bias, |
370 | DPRINTF("Map to seg_addr=0x%x-0x%x.\n", seg_addr, |
366 | entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
371 | entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE)); |
367 | 372 | ||
368 | /* |
373 | /* |
369 | * For the course of loading, the area needs to be readable |
374 | * For the course of loading, the area needs to be readable |
370 | * and writeable. |
375 | * and writeable. |
371 | */ |
376 | */ |
372 | a = as_area_create((uint8_t *)base + bias, mem_sz, |
377 | a = as_area_create((uint8_t *)base + bias, mem_sz, |
373 | AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
378 | AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE); |
374 | if (a == (void *)(-1)) { |
379 | if (a == (void *)(-1)) { |
375 | DPRINTF("memory mapping failed (0x%x, %d)\n", |
380 | DPRINTF("memory mapping failed (0x%x, %d)\n", |
376 | base+bias, mem_sz); |
381 | base+bias, mem_sz); |
377 | return EE_MEMORY; |
382 | return EE_MEMORY; |
378 | } |
383 | } |
379 | 384 | ||
380 | DPRINTF("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
385 | DPRINTF("as_area_create(0x%lx, 0x%x, %d) -> 0x%lx\n", |
381 | entry->p_vaddr+bias, entry->p_memsz, flags, (uintptr_t)a); |
386 | base + bias, mem_sz, flags, (uintptr_t)a); |
382 | 387 | ||
383 | /* |
388 | /* |
384 | * Load segment data |
389 | * Load segment data |
385 | */ |
390 | */ |
386 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
391 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
387 | if (rc < 0) { |
392 | if (rc < 0) { |
388 | printf("seek error\n"); |
393 | printf("seek error\n"); |
389 | return EE_INVALID; |
394 | return EE_INVALID; |
390 | } |
395 | } |
391 | 396 | ||
392 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
397 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
393 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
398 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
394 | 399 | ||
395 | /* Long reads are not possible yet. Load segment piecewise. */ |
400 | /* Long reads are not possible yet. Load segment piecewise. */ |
396 | 401 | ||
397 | unsigned left, now; |
402 | unsigned left, now; |
398 | uint8_t *dp; |
403 | uint8_t *dp; |
399 | 404 | ||
400 | left = entry->p_filesz; |
405 | left = entry->p_filesz; |
401 | dp = (uint8_t *)(entry->p_vaddr + bias); |
406 | dp = seg_ptr; |
402 | 407 | ||
403 | while (left > 0) { |
408 | while (left > 0) { |
404 | now = 16384; |
409 | now = 16384; |
405 | if (now > left) now = left; |
410 | if (now > left) now = left; |
406 | 411 | ||
407 | rc = my_read(elf->fd, dp, now); |
412 | rc = my_read(elf->fd, dp, now); |
408 | 413 | ||
409 | if (rc < 0) { |
414 | if (rc < 0) { |
410 | DPRINTF("Read error.\n"); |
415 | DPRINTF("Read error.\n"); |
411 | return EE_INVALID; |
416 | return EE_INVALID; |
412 | } |
417 | } |
413 | 418 | ||
414 | left -= now; |
419 | left -= now; |
415 | dp += now; |
420 | dp += now; |
416 | } |
421 | } |
417 | 422 | ||
418 | /* |
423 | /* |
419 | * The caller wants to modify the segments first. He will then |
424 | * The caller wants to modify the segments first. He will then |
420 | * need to set the right access mode and ensure SMC coherence. |
425 | * need to set the right access mode and ensure SMC coherence. |
421 | */ |
426 | */ |
422 | if ((elf->flags & ELDF_RW) != 0) return EE_OK; |
427 | if ((elf->flags & ELDF_RW) != 0) return EE_OK; |
423 | 428 | ||
424 | // printf("set area flags to %d\n", flags); |
429 | // printf("set area flags to %d\n", flags); |
425 | rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags); |
430 | rc = as_area_change_flags(seg_ptr, flags); |
426 | if (rc != 0) { |
431 | if (rc != 0) { |
427 | DPRINTF("Failed to set memory area flags.\n"); |
432 | DPRINTF("Failed to set memory area flags.\n"); |
428 | return EE_MEMORY; |
433 | return EE_MEMORY; |
429 | } |
434 | } |
430 | 435 | ||
431 | if (flags & AS_AREA_EXEC) { |
436 | if (flags & AS_AREA_EXEC) { |
432 | /* Enforce SMC coherence for the segment */ |
437 | /* Enforce SMC coherence for the segment */ |
433 | if (smc_coherence(entry->p_vaddr + bias, entry->p_filesz)) |
438 | if (smc_coherence(seg_ptr, entry->p_filesz)) |
434 | return EE_MEMORY; |
439 | return EE_MEMORY; |
435 | } |
440 | } |
436 | 441 | ||
437 | return EE_OK; |
442 | return EE_OK; |
438 | } |
443 | } |
439 | 444 | ||
440 | /** Process section header. |
445 | /** Process section header. |
441 | * |
446 | * |
442 | * @param elf Loader state. |
447 | * @param elf Loader state. |
443 | * @param entry Segment header. |
448 | * @param entry Segment header. |
444 | * |
449 | * |
445 | * @return EE_OK on success, error code otherwise. |
450 | * @return EE_OK on success, error code otherwise. |
446 | */ |
451 | */ |
447 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
452 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
448 | { |
453 | { |
449 | switch (entry->sh_type) { |
454 | switch (entry->sh_type) { |
450 | case SHT_PROGBITS: |
455 | case SHT_PROGBITS: |
451 | if (entry->sh_flags & SHF_TLS) { |
456 | if (entry->sh_flags & SHF_TLS) { |
452 | /* .tdata */ |
457 | /* .tdata */ |
453 | } |
458 | } |
454 | break; |
459 | break; |
455 | case SHT_NOBITS: |
460 | case SHT_NOBITS: |
456 | if (entry->sh_flags & SHF_TLS) { |
461 | if (entry->sh_flags & SHF_TLS) { |
457 | /* .tbss */ |
462 | /* .tbss */ |
458 | } |
463 | } |
459 | break; |
464 | break; |
460 | case SHT_DYNAMIC: |
465 | case SHT_DYNAMIC: |
461 | break; |
466 | break; |
462 | default: |
467 | default: |
463 | break; |
468 | break; |
464 | } |
469 | } |
465 | 470 | ||
466 | return EE_OK; |
471 | return EE_OK; |
467 | } |
472 | } |
468 | 473 | ||
469 | /** @} |
474 | /** @} |
470 | */ |
475 | */ |
471 | 476 |