xref: /illumos-kvm-cmd/hw/elf_ops.h (revision 68396ea9)

glue(bswap_ehdr,SZ)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 
glue(bswap_phdr,SZ)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 
glue(bswap_shdr,SZ)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 
glue(bswap_sym,SZ)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 
glue(find_section,SZ)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 
glue(symfind,SZ)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 
glue(lookup_symbol,SZ)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 
glue(symcmp,SZ)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 
glue(load_symbols,SZ)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     if (nsyms) {
153         syms = qemu_realloc(syms, nsyms * sizeof(*syms));
154 
155         qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
156         for (i = 0; i < nsyms - 1; i++) {
157             if (syms[i].st_size == 0) {
158                 syms[i].st_size = syms[i + 1].st_value - syms[i].st_value;
159             }
160         }
161     } else {
162         qemu_free(syms);
163         syms = NULL;
164     }
165 
166     /* String table */
167     if (symtab->sh_link >= ehdr->e_shnum)
168         goto fail;
169     strtab = &shdr_table[symtab->sh_link];
170 
171     str = load_at(fd, strtab->sh_offset, strtab->sh_size);
172     if (!str)
173         goto fail;
174 
175     /* Commit */
176     s = qemu_mallocz(sizeof(*s));
177     s->lookup_symbol = glue(lookup_symbol, SZ);
178     glue(s->disas_symtab.elf, SZ) = syms;
179     s->disas_num_syms = nsyms;
180     s->disas_strtab = str;
181     s->next = syminfos;
182     syminfos = s;
183     qemu_free(shdr_table);
184     return 0;
185  fail:
186     qemu_free(syms);
187     qemu_free(str);
188     qemu_free(shdr_table);
189     return -1;
190 }
191 
glue(load_elf,SZ)192 static int glue(load_elf, SZ)(const char *name, int fd,
193                               uint64_t (*translate_fn)(void *, uint64_t),
194                               void *translate_opaque,
195                               int must_swab, uint64_t *pentry,
196                               uint64_t *lowaddr, uint64_t *highaddr,
197                               int elf_machine, int clear_lsb)
198 {
199     struct elfhdr ehdr;
200     struct elf_phdr *phdr = NULL, *ph;
201     int size, i, total_size;
202     elf_word mem_size;
203     uint64_t addr, low = (uint64_t)-1, high = 0;
204     uint8_t *data = NULL;
205     char label[128];
206 
207     if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
208         goto fail;
209     if (must_swab) {
210         glue(bswap_ehdr, SZ)(&ehdr);
211     }
212 
213     switch (elf_machine) {
214         case EM_PPC64:
215             if (EM_PPC64 != ehdr.e_machine)
216                 if (EM_PPC != ehdr.e_machine)
217                     goto fail;
218             break;
219         case EM_X86_64:
220             if (EM_X86_64 != ehdr.e_machine)
221                 if (EM_386 != ehdr.e_machine)
222                     goto fail;
223             break;
224         case EM_MICROBLAZE:
225             if (EM_MICROBLAZE != ehdr.e_machine)
226                 if (EM_MICROBLAZE_OLD != ehdr.e_machine)
227                     goto fail;
228             break;
229         default:
230             if (elf_machine != ehdr.e_machine)
231                 goto fail;
232     }
233 
234     if (pentry)
235    	*pentry = (uint64_t)(elf_sword)ehdr.e_entry;
236 
237     glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb);
238 
239     size = ehdr.e_phnum * sizeof(phdr[0]);
240     lseek(fd, ehdr.e_phoff, SEEK_SET);
241     phdr = qemu_mallocz(size);
242     if (!phdr)
243         goto fail;
244     if (read(fd, phdr, size) != size)
245         goto fail;
246     if (must_swab) {
247         for(i = 0; i < ehdr.e_phnum; i++) {
248             ph = &phdr[i];
249             glue(bswap_phdr, SZ)(ph);
250         }
251     }
252 
253     total_size = 0;
254     for(i = 0; i < ehdr.e_phnum; i++) {
255         ph = &phdr[i];
256         if (ph->p_type == PT_LOAD) {
257             mem_size = ph->p_memsz;
258             /* XXX: avoid allocating */
259             data = qemu_mallocz(mem_size);
260             if (ph->p_filesz > 0) {
261                 if (lseek(fd, ph->p_offset, SEEK_SET) < 0)
262                     goto fail;
263                 if (read(fd, data, ph->p_filesz) != ph->p_filesz)
264                     goto fail;
265             }
266             /* address_offset is hack for kernel images that are
267                linked at the wrong physical address.  */
268             if (translate_fn) {
269                 addr = translate_fn(translate_opaque, ph->p_paddr);
270             } else {
271                 addr = ph->p_paddr;
272             }
273 
274             snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
275             rom_add_blob_fixed(label, data, mem_size, addr);
276 
277             total_size += mem_size;
278             if (addr < low)
279                 low = addr;
280             if ((addr + mem_size) > high)
281                 high = addr + mem_size;
282 
283             qemu_free(data);
284             data = NULL;
285         }
286     }
287     qemu_free(phdr);
288     if (lowaddr)
289         *lowaddr = (uint64_t)(elf_sword)low;
290     if (highaddr)
291         *highaddr = (uint64_t)(elf_sword)high;
292     return total_size;
293  fail:
294     qemu_free(data);
295     qemu_free(phdr);
296     return -1;
297 }
298