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1 | /* |
2 | * QEMU Executable loader | |
3 | * | |
4 | * Copyright (c) 2006 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include "vl.h" | |
25 | #include "disas.h" | |
26 | ||
27 | /* return the size or -1 if error */ | |
28 | int get_image_size(const char *filename) | |
29 | { | |
30 | int fd, size; | |
31 | fd = open(filename, O_RDONLY | O_BINARY); | |
32 | if (fd < 0) | |
33 | return -1; | |
34 | size = lseek(fd, 0, SEEK_END); | |
35 | close(fd); | |
36 | return size; | |
37 | } | |
38 | ||
39 | /* return the size or -1 if error */ | |
40 | int load_image(const char *filename, uint8_t *addr) | |
41 | { | |
42 | int fd, size; | |
43 | fd = open(filename, O_RDONLY | O_BINARY); | |
44 | if (fd < 0) | |
45 | return -1; | |
46 | size = lseek(fd, 0, SEEK_END); | |
47 | lseek(fd, 0, SEEK_SET); | |
48 | if (read(fd, addr, size) != size) { | |
49 | close(fd); | |
50 | return -1; | |
51 | } | |
52 | close(fd); | |
53 | return size; | |
54 | } | |
55 | ||
56 | /* A.OUT loader */ | |
57 | ||
58 | struct exec | |
59 | { | |
60 | uint32_t a_info; /* Use macros N_MAGIC, etc for access */ | |
61 | uint32_t a_text; /* length of text, in bytes */ | |
62 | uint32_t a_data; /* length of data, in bytes */ | |
63 | uint32_t a_bss; /* length of uninitialized data area, in bytes */ | |
64 | uint32_t a_syms; /* length of symbol table data in file, in bytes */ | |
65 | uint32_t a_entry; /* start address */ | |
66 | uint32_t a_trsize; /* length of relocation info for text, in bytes */ | |
67 | uint32_t a_drsize; /* length of relocation info for data, in bytes */ | |
68 | }; | |
69 | ||
70 | #ifdef BSWAP_NEEDED | |
71 | static void bswap_ahdr(struct exec *e) | |
72 | { | |
73 | bswap32s(&e->a_info); | |
74 | bswap32s(&e->a_text); | |
75 | bswap32s(&e->a_data); | |
76 | bswap32s(&e->a_bss); | |
77 | bswap32s(&e->a_syms); | |
78 | bswap32s(&e->a_entry); | |
79 | bswap32s(&e->a_trsize); | |
80 | bswap32s(&e->a_drsize); | |
81 | } | |
82 | #else | |
83 | #define bswap_ahdr(x) do { } while (0) | |
84 | #endif | |
85 | ||
86 | #define N_MAGIC(exec) ((exec).a_info & 0xffff) | |
87 | #define OMAGIC 0407 | |
88 | #define NMAGIC 0410 | |
89 | #define ZMAGIC 0413 | |
90 | #define QMAGIC 0314 | |
91 | #define _N_HDROFF(x) (1024 - sizeof (struct exec)) | |
92 | #define N_TXTOFF(x) \ | |
93 | (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \ | |
94 | (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec))) | |
95 | #define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0) | |
96 | #define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text) | |
97 | #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1)) | |
98 | ||
99 | #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text) | |
100 | ||
101 | #define N_DATADDR(x) \ | |
102 | (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \ | |
103 | : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x)))) | |
104 | ||
105 | ||
106 | int load_aout(const char *filename, uint8_t *addr) | |
107 | { | |
108 | int fd, size, ret; | |
109 | struct exec e; | |
110 | uint32_t magic; | |
111 | ||
112 | fd = open(filename, O_RDONLY | O_BINARY); | |
113 | if (fd < 0) | |
114 | return -1; | |
115 | ||
116 | size = read(fd, &e, sizeof(e)); | |
117 | if (size < 0) | |
118 | goto fail; | |
119 | ||
120 | bswap_ahdr(&e); | |
121 | ||
122 | magic = N_MAGIC(e); | |
123 | switch (magic) { | |
124 | case ZMAGIC: | |
125 | case QMAGIC: | |
126 | case OMAGIC: | |
127 | lseek(fd, N_TXTOFF(e), SEEK_SET); | |
128 | size = read(fd, addr, e.a_text + e.a_data); | |
129 | if (size < 0) | |
130 | goto fail; | |
131 | break; | |
132 | case NMAGIC: | |
133 | lseek(fd, N_TXTOFF(e), SEEK_SET); | |
134 | size = read(fd, addr, e.a_text); | |
135 | if (size < 0) | |
136 | goto fail; | |
137 | ret = read(fd, addr + N_DATADDR(e), e.a_data); | |
138 | if (ret < 0) | |
139 | goto fail; | |
140 | size += ret; | |
141 | break; | |
142 | default: | |
143 | goto fail; | |
144 | } | |
145 | close(fd); | |
146 | return size; | |
147 | fail: | |
148 | close(fd); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | /* ELF loader */ | |
153 | ||
154 | static void *load_at(int fd, int offset, int size) | |
155 | { | |
156 | void *ptr; | |
157 | if (lseek(fd, offset, SEEK_SET) < 0) | |
158 | return NULL; | |
159 | ptr = qemu_malloc(size); | |
160 | if (!ptr) | |
161 | return NULL; | |
162 | if (read(fd, ptr, size) != size) { | |
163 | qemu_free(ptr); | |
164 | return NULL; | |
165 | } | |
166 | return ptr; | |
167 | } | |
168 | ||
169 | ||
170 | #define ELF_CLASS ELFCLASS32 | |
171 | #include "elf.h" | |
172 | ||
173 | #define SZ 32 | |
174 | #define elf_word uint32_t | |
175 | #define bswapSZs bswap32s | |
176 | #include "elf_ops.h" | |
177 | ||
178 | #undef elfhdr | |
179 | #undef elf_phdr | |
180 | #undef elf_shdr | |
181 | #undef elf_sym | |
182 | #undef elf_note | |
183 | #undef elf_word | |
184 | #undef bswapSZs | |
185 | #undef SZ | |
186 | #define elfhdr elf64_hdr | |
187 | #define elf_phdr elf64_phdr | |
188 | #define elf_note elf64_note | |
189 | #define elf_shdr elf64_shdr | |
190 | #define elf_sym elf64_sym | |
191 | #define elf_word uint64_t | |
192 | #define bswapSZs bswap64s | |
193 | #define SZ 64 | |
194 | #include "elf_ops.h" | |
195 | ||
196 | /* return < 0 if error, otherwise the number of bytes loaded in memory */ | |
9ee3c029 FB |
197 | int load_elf(const char *filename, int64_t virt_to_phys_addend, |
198 | uint64_t *pentry) | |
5fe141fd FB |
199 | { |
200 | int fd, data_order, must_swab, ret; | |
201 | uint8_t e_ident[EI_NIDENT]; | |
202 | ||
699e4642 | 203 | fd = open(filename, O_RDONLY | O_BINARY); |
5fe141fd FB |
204 | if (fd < 0) { |
205 | perror(filename); | |
206 | return -1; | |
207 | } | |
208 | if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) | |
209 | goto fail; | |
210 | if (e_ident[0] != ELFMAG0 || | |
211 | e_ident[1] != ELFMAG1 || | |
212 | e_ident[2] != ELFMAG2 || | |
213 | e_ident[3] != ELFMAG3) | |
214 | goto fail; | |
215 | #ifdef WORDS_BIGENDIAN | |
216 | data_order = ELFDATA2MSB; | |
217 | #else | |
218 | data_order = ELFDATA2LSB; | |
219 | #endif | |
220 | must_swab = data_order != e_ident[EI_DATA]; | |
221 | ||
222 | lseek(fd, 0, SEEK_SET); | |
223 | if (e_ident[EI_CLASS] == ELFCLASS64) { | |
9ee3c029 | 224 | ret = load_elf64(fd, virt_to_phys_addend, must_swab, pentry); |
5fe141fd | 225 | } else { |
9ee3c029 | 226 | ret = load_elf32(fd, virt_to_phys_addend, must_swab, pentry); |
5fe141fd FB |
227 | } |
228 | ||
229 | close(fd); | |
230 | return ret; | |
231 | ||
232 | fail: | |
233 | close(fd); | |
234 | return -1; | |
235 | } |