root / hw / elf_ops.h @ 28366c3a
History | View | Annotate | Download (8.2 kB)
1 |
static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr) |
---|---|
2 |
{ |
3 |
bswap16s(&ehdr->e_type); /* Object file type */
|
4 |
bswap16s(&ehdr->e_machine); /* Architecture */
|
5 |
bswap32s(&ehdr->e_version); /* Object file version */
|
6 |
bswapSZs(&ehdr->e_entry); /* Entry point virtual address */
|
7 |
bswapSZs(&ehdr->e_phoff); /* Program header table file offset */
|
8 |
bswapSZs(&ehdr->e_shoff); /* Section header table file offset */
|
9 |
bswap32s(&ehdr->e_flags); /* Processor-specific flags */
|
10 |
bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
|
11 |
bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
|
12 |
bswap16s(&ehdr->e_phnum); /* Program header table entry count */
|
13 |
bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
|
14 |
bswap16s(&ehdr->e_shnum); /* Section header table entry count */
|
15 |
bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
|
16 |
} |
17 |
|
18 |
static void glue(bswap_phdr, SZ)(struct elf_phdr *phdr) |
19 |
{ |
20 |
bswap32s(&phdr->p_type); /* Segment type */
|
21 |
bswapSZs(&phdr->p_offset); /* Segment file offset */
|
22 |
bswapSZs(&phdr->p_vaddr); /* Segment virtual address */
|
23 |
bswapSZs(&phdr->p_paddr); /* Segment physical address */
|
24 |
bswapSZs(&phdr->p_filesz); /* Segment size in file */
|
25 |
bswapSZs(&phdr->p_memsz); /* Segment size in memory */
|
26 |
bswap32s(&phdr->p_flags); /* Segment flags */
|
27 |
bswapSZs(&phdr->p_align); /* Segment alignment */
|
28 |
} |
29 |
|
30 |
static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr) |
31 |
{ |
32 |
bswap32s(&shdr->sh_name); |
33 |
bswap32s(&shdr->sh_type); |
34 |
bswapSZs(&shdr->sh_flags); |
35 |
bswapSZs(&shdr->sh_addr); |
36 |
bswapSZs(&shdr->sh_offset); |
37 |
bswapSZs(&shdr->sh_size); |
38 |
bswap32s(&shdr->sh_link); |
39 |
bswap32s(&shdr->sh_info); |
40 |
bswapSZs(&shdr->sh_addralign); |
41 |
bswapSZs(&shdr->sh_entsize); |
42 |
} |
43 |
|
44 |
static void glue(bswap_sym, SZ)(struct elf_sym *sym) |
45 |
{ |
46 |
bswap32s(&sym->st_name); |
47 |
bswapSZs(&sym->st_value); |
48 |
bswapSZs(&sym->st_size); |
49 |
bswap16s(&sym->st_shndx); |
50 |
} |
51 |
|
52 |
static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table, |
53 |
int n, int type) |
54 |
{ |
55 |
int i;
|
56 |
for(i=0;i<n;i++) { |
57 |
if (shdr_table[i].sh_type == type)
|
58 |
return shdr_table + i;
|
59 |
} |
60 |
return NULL; |
61 |
} |
62 |
|
63 |
static int glue(symfind, SZ)(const void *s0, const void *s1) |
64 |
{ |
65 |
struct elf_sym *key = (struct elf_sym *)s0; |
66 |
struct elf_sym *sym = (struct elf_sym *)s1; |
67 |
int result = 0; |
68 |
if (key->st_value < sym->st_value) {
|
69 |
result = -1;
|
70 |
} else if (key->st_value >= sym->st_value + sym->st_size) { |
71 |
result = 1;
|
72 |
} |
73 |
return result;
|
74 |
} |
75 |
|
76 |
static const char *glue(lookup_symbol, SZ)(struct syminfo *s, |
77 |
target_phys_addr_t orig_addr) |
78 |
{ |
79 |
struct elf_sym *syms = glue(s->disas_symtab.elf, SZ);
|
80 |
struct elf_sym key;
|
81 |
struct elf_sym *sym;
|
82 |
|
83 |
key.st_value = orig_addr; |
84 |
|
85 |
sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), glue(symfind, SZ));
|
86 |
if (sym != NULL) { |
87 |
return s->disas_strtab + sym->st_name;
|
88 |
} |
89 |
|
90 |
return ""; |
91 |
} |
92 |
|
93 |
static int glue(symcmp, SZ)(const void *s0, const void *s1) |
94 |
{ |
95 |
struct elf_sym *sym0 = (struct elf_sym *)s0; |
96 |
struct elf_sym *sym1 = (struct elf_sym *)s1; |
97 |
return (sym0->st_value < sym1->st_value)
|
98 |
? -1
|
99 |
: ((sym0->st_value > sym1->st_value) ? 1 : 0); |
100 |
} |
101 |
|
102 |
static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab, |
103 |
int clear_lsb)
|
104 |
{ |
105 |
struct elf_shdr *symtab, *strtab, *shdr_table = NULL; |
106 |
struct elf_sym *syms = NULL; |
107 |
struct syminfo *s;
|
108 |
int nsyms, i;
|
109 |
char *str = NULL; |
110 |
|
111 |
shdr_table = load_at(fd, ehdr->e_shoff, |
112 |
sizeof(struct elf_shdr) * ehdr->e_shnum); |
113 |
if (!shdr_table)
|
114 |
return -1; |
115 |
|
116 |
if (must_swab) {
|
117 |
for (i = 0; i < ehdr->e_shnum; i++) { |
118 |
glue(bswap_shdr, SZ)(shdr_table + i); |
119 |
} |
120 |
} |
121 |
|
122 |
symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB); |
123 |
if (!symtab)
|
124 |
goto fail;
|
125 |
syms = load_at(fd, symtab->sh_offset, symtab->sh_size); |
126 |
if (!syms)
|
127 |
goto fail;
|
128 |
|
129 |
nsyms = symtab->sh_size / sizeof(struct elf_sym); |
130 |
|
131 |
i = 0;
|
132 |
while (i < nsyms) {
|
133 |
if (must_swab)
|
134 |
glue(bswap_sym, SZ)(&syms[i]); |
135 |
/* We are only interested in function symbols.
|
136 |
Throw everything else away. */
|
137 |
if (syms[i].st_shndx == SHN_UNDEF ||
|
138 |
syms[i].st_shndx >= SHN_LORESERVE || |
139 |
ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { |
140 |
nsyms--; |
141 |
if (i < nsyms) {
|
142 |
syms[i] = syms[nsyms]; |
143 |
} |
144 |
continue;
|
145 |
} |
146 |
if (clear_lsb) {
|
147 |
/* The bottom address bit marks a Thumb or MIPS16 symbol. */
|
148 |
syms[i].st_value &= ~(glue(glue(Elf, SZ), _Addr))1;
|
149 |
} |
150 |
i++; |
151 |
} |
152 |
syms = qemu_realloc(syms, nsyms * sizeof(*syms));
|
153 |
|
154 |
qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
|
155 |
|
156 |
/* String table */
|
157 |
if (symtab->sh_link >= ehdr->e_shnum)
|
158 |
goto fail;
|
159 |
strtab = &shdr_table[symtab->sh_link]; |
160 |
|
161 |
str = load_at(fd, strtab->sh_offset, strtab->sh_size); |
162 |
if (!str)
|
163 |
goto fail;
|
164 |
|
165 |
/* Commit */
|
166 |
s = qemu_mallocz(sizeof(*s));
|
167 |
s->lookup_symbol = glue(lookup_symbol, SZ); |
168 |
glue(s->disas_symtab.elf, SZ) = syms; |
169 |
s->disas_num_syms = nsyms; |
170 |
s->disas_strtab = str; |
171 |
s->next = syminfos; |
172 |
syminfos = s; |
173 |
qemu_free(shdr_table); |
174 |
return 0; |
175 |
fail:
|
176 |
qemu_free(syms); |
177 |
qemu_free(str); |
178 |
qemu_free(shdr_table); |
179 |
return -1; |
180 |
} |
181 |
|
182 |
static int glue(load_elf, SZ)(const char *name, int fd, int64_t address_offset, |
183 |
int must_swab, uint64_t *pentry,
|
184 |
uint64_t *lowaddr, uint64_t *highaddr, |
185 |
int elf_machine, int clear_lsb) |
186 |
{ |
187 |
struct elfhdr ehdr;
|
188 |
struct elf_phdr *phdr = NULL, *ph; |
189 |
int size, i, total_size;
|
190 |
elf_word mem_size; |
191 |
uint64_t addr, low = (uint64_t)-1, high = 0; |
192 |
uint8_t *data = NULL;
|
193 |
char label[128]; |
194 |
|
195 |
if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) |
196 |
goto fail;
|
197 |
if (must_swab) {
|
198 |
glue(bswap_ehdr, SZ)(&ehdr); |
199 |
} |
200 |
|
201 |
switch (elf_machine) {
|
202 |
case EM_PPC64:
|
203 |
if (EM_PPC64 != ehdr.e_machine)
|
204 |
if (EM_PPC != ehdr.e_machine)
|
205 |
goto fail;
|
206 |
break;
|
207 |
case EM_X86_64:
|
208 |
if (EM_X86_64 != ehdr.e_machine)
|
209 |
if (EM_386 != ehdr.e_machine)
|
210 |
goto fail;
|
211 |
break;
|
212 |
default:
|
213 |
if (elf_machine != ehdr.e_machine)
|
214 |
goto fail;
|
215 |
} |
216 |
|
217 |
if (pentry)
|
218 |
*pentry = (uint64_t)(elf_sword)ehdr.e_entry; |
219 |
|
220 |
glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb); |
221 |
|
222 |
size = ehdr.e_phnum * sizeof(phdr[0]); |
223 |
lseek(fd, ehdr.e_phoff, SEEK_SET); |
224 |
phdr = qemu_mallocz(size); |
225 |
if (!phdr)
|
226 |
goto fail;
|
227 |
if (read(fd, phdr, size) != size)
|
228 |
goto fail;
|
229 |
if (must_swab) {
|
230 |
for(i = 0; i < ehdr.e_phnum; i++) { |
231 |
ph = &phdr[i]; |
232 |
glue(bswap_phdr, SZ)(ph); |
233 |
} |
234 |
} |
235 |
|
236 |
total_size = 0;
|
237 |
for(i = 0; i < ehdr.e_phnum; i++) { |
238 |
ph = &phdr[i]; |
239 |
if (ph->p_type == PT_LOAD) {
|
240 |
mem_size = ph->p_memsz; |
241 |
/* XXX: avoid allocating */
|
242 |
data = qemu_mallocz(mem_size); |
243 |
if (ph->p_filesz > 0) { |
244 |
if (lseek(fd, ph->p_offset, SEEK_SET) < 0) |
245 |
goto fail;
|
246 |
if (read(fd, data, ph->p_filesz) != ph->p_filesz)
|
247 |
goto fail;
|
248 |
} |
249 |
/* address_offset is hack for kernel images that are
|
250 |
linked at the wrong physical address. */
|
251 |
addr = ph->p_paddr + address_offset; |
252 |
|
253 |
snprintf(label, sizeof(label), "phdr #%d: %s", i, name); |
254 |
rom_add_blob_fixed(label, data, mem_size, addr); |
255 |
|
256 |
total_size += mem_size; |
257 |
if (addr < low)
|
258 |
low = addr; |
259 |
if ((addr + mem_size) > high)
|
260 |
high = addr + mem_size; |
261 |
|
262 |
qemu_free(data); |
263 |
data = NULL;
|
264 |
} |
265 |
} |
266 |
qemu_free(phdr); |
267 |
if (lowaddr)
|
268 |
*lowaddr = (uint64_t)(elf_sword)low; |
269 |
if (highaddr)
|
270 |
*highaddr = (uint64_t)(elf_sword)high; |
271 |
return total_size;
|
272 |
fail:
|
273 |
qemu_free(data); |
274 |
qemu_free(phdr); |
275 |
return -1; |
276 |
} |