hw/elf_ops.h

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