LXR qemu/include/hw/elf

   1static 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
  18static 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
  30static 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
  44static 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
  52static void glue(bswap_rela, SZ)(struct elf_rela *rela)
  53{
  54    bswapSZs(&rela->r_offset);
  55    bswapSZs(&rela->r_info);
  56    bswapSZs((elf_word *)&rela->r_addend);
  57}
  58
  59static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,
  60                                               int n, int type)
  61{
  62    int i;
  63    for(i=0;i<n;i++) {
  64        if (shdr_table[i].sh_type == type)
  65            return shdr_table + i;
  66    }
  67    return NULL;
  68}
  69
  70static int glue(symfind, SZ)(const void *s0, const void *s1)
  71{
  72    hwaddr addr = *(hwaddr *)s0;
  73    struct elf_sym *sym = (struct elf_sym *)s1;
  74    int result = 0;
  75    if (addr < sym->st_value) {
  76        result = -1;
  77    } else if (addr >= sym->st_value + sym->st_size) {
  78        result = 1;
  79    }
  80    return result;
  81}
  82
  83static const char *glue(lookup_symbol, SZ)(struct syminfo *s,
  84                                           hwaddr orig_addr)
  85{
  86    struct elf_sym *syms = glue(s->disas_symtab.elf, SZ);
  87    struct elf_sym *sym;
  88
  89    sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms),
  90                  glue(symfind, SZ));
  91    if (sym != NULL) {
  92        return s->disas_strtab + sym->st_name;
  93    }
  94
  95    return "";
  96}
  97
  98static int glue(symcmp, SZ)(const void *s0, const void *s1)
  99{
 100    struct elf_sym *sym0 = (struct elf_sym *)s0;
 101    struct elf_sym *sym1 = (struct elf_sym *)s1;
 102    return (sym0->st_value < sym1->st_value)
 103        ? -1
 104        : ((sym0->st_value > sym1->st_value) ? 1 : 0);
 105}
 106
 107static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
 108                                  int clear_lsb)
 109{
 110    struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
 111    struct elf_sym *syms = NULL;
 112    struct syminfo *s;
 113    int nsyms, i;
 114    char *str = NULL;
 115
 116    shdr_table = load_at(fd, ehdr->e_shoff,
 117                         sizeof(struct elf_shdr) * ehdr->e_shnum);
 118    if (!shdr_table)
 119        return -1;
 120
 121    if (must_swab) {
 122        for (i = 0; i < ehdr->e_shnum; i++) {
 123            glue(bswap_shdr, SZ)(shdr_table + i);
 124        }
 125    }
 126
 127    symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
 128    if (!symtab)
 129        goto fail;
 130    syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
 131    if (!syms)
 132        goto fail;
 133
 134    nsyms = symtab->sh_size / sizeof(struct elf_sym);
 135
 136    i = 0;
 137    while (i < nsyms) {
 138        if (must_swab)
 139            glue(bswap_sym, SZ)(&syms[i]);
 140        /* We are only interested in function symbols.
 141           Throw everything else away.  */
 142        if (syms[i].st_shndx == SHN_UNDEF ||
 143                syms[i].st_shndx >= SHN_LORESERVE ||
 144                ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
 145            nsyms--;
 146            if (i < nsyms) {
 147                syms[i] = syms[nsyms];
 148            }
 149            continue;
 150        }
 151        if (clear_lsb) {
 152            /* The bottom address bit marks a Thumb or MIPS16 symbol.  */
 153            syms[i].st_value &= ~(glue(glue(Elf, SZ), _Addr))1;
 154        }
 155        i++;
 156    }
 157    syms = g_realloc(syms, nsyms * sizeof(*syms));
 158
 159    qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
 160    for (i = 0; i < nsyms - 1; i++) {
 161        if (syms[i].st_size == 0) {
 162            syms[i].st_size = syms[i + 1].st_value - syms[i].st_value;
 163        }
 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 = g_malloc0(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    g_free(shdr_table);
 184    return 0;
 185 fail:
 186    g_free(syms);
 187    g_free(str);
 188    g_free(shdr_table);
 189    return -1;
 190}
 191
 192static int glue(elf_reloc, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
 193                               uint64_t (*translate_fn)(void *, uint64_t),
 194                               void *translate_opaque, uint8_t *data,
 195                               struct elf_phdr *ph, int elf_machine)
 196{
 197    struct elf_shdr *reltab, *shdr_table = NULL;
 198    struct elf_rela *rels = NULL;
 199    int nrels, i, ret = -1;
 200    elf_word wordval;
 201    void *addr;
 202
 203    shdr_table = load_at(fd, ehdr->e_shoff,
 204                         sizeof(struct elf_shdr) * ehdr->e_shnum);
 205    if (!shdr_table) {
 206        return -1;
 207    }
 208    if (must_swab) {
 209        for (i = 0; i < ehdr->e_shnum; i++) {
 210            glue(bswap_shdr, SZ)(&shdr_table[i]);
 211        }
 212    }
 213
 214    reltab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_RELA);
 215    if (!reltab) {
 216        goto fail;
 217    }
 218    rels = load_at(fd, reltab->sh_offset, reltab->sh_size);
 219    if (!rels) {
 220        goto fail;
 221    }
 222    nrels = reltab->sh_size / sizeof(struct elf_rela);
 223
 224    for (i = 0; i < nrels; i++) {
 225        if (must_swab) {
 226            glue(bswap_rela, SZ)(&rels[i]);
 227        }
 228        if (rels[i].r_offset < ph->p_vaddr ||
 229            rels[i].r_offset >= ph->p_vaddr + ph->p_filesz) {
 230            continue;
 231        }
 232        addr = &data[rels[i].r_offset - ph->p_vaddr];
 233        switch (elf_machine) {
 234        case EM_S390:
 235            switch (rels[i].r_info) {
 236            case R_390_RELATIVE:
 237                wordval = *(elf_word *)addr;
 238                if (must_swab) {
 239                    bswapSZs(&wordval);
 240                }
 241                wordval = translate_fn(translate_opaque, wordval);
 242                if (must_swab) {
 243                    bswapSZs(&wordval);
 244                }
 245                *(elf_word *)addr = wordval;
 246                break;
 247            default:
 248                fprintf(stderr, "Unsupported relocation type %i!\n",
 249                        (int)rels[i].r_info);
 250            }
 251        }
 252    }
 253
 254    ret = 0;
 255fail:
 256    g_free(rels);
 257    g_free(shdr_table);
 258    return ret;
 259}
 260
 261static int glue(load_elf, SZ)(const char *name, int fd,
 262                              uint64_t (*translate_fn)(void *, uint64_t),
 263                              void *translate_opaque,
 264                              int must_swab, uint64_t *pentry,
 265                              uint64_t *lowaddr, uint64_t *highaddr,
 266                              int elf_machine, int clear_lsb, int data_swab,
 267                              AddressSpace *as)
 268{
 269    struct elfhdr ehdr;
 270    struct elf_phdr *phdr = NULL, *ph;
 271    int size, i, total_size;
 272    elf_word mem_size, file_size;
 273    uint64_t addr, low = (uint64_t)-1, high = 0;
 274    uint8_t *data = NULL;
 275    char label[128];
 276    int ret = ELF_LOAD_FAILED;
 277
 278    if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
 279        goto fail;
 280    if (must_swab) {
 281        glue(bswap_ehdr, SZ)(&ehdr);
 282    }
 283
 284    if (elf_machine <= EM_NONE) {
 285        /* The caller didn't specify an ARCH, we can figure it out */
 286        elf_machine = ehdr.e_machine;
 287    }
 288
 289    switch (elf_machine) {
 290        case EM_PPC64:
 291            if (ehdr.e_machine != EM_PPC64) {
 292                if (ehdr.e_machine != EM_PPC) {
 293                    ret = ELF_LOAD_WRONG_ARCH;
 294                    goto fail;
 295                }
 296            }
 297            break;
 298        case EM_X86_64:
 299            if (ehdr.e_machine != EM_X86_64) {
 300                if (ehdr.e_machine != EM_386) {
 301                    ret = ELF_LOAD_WRONG_ARCH;
 302                    goto fail;
 303                }
 304            }
 305            break;
 306        case EM_MICROBLAZE:
 307            if (ehdr.e_machine != EM_MICROBLAZE) {
 308                if (ehdr.e_machine != EM_MICROBLAZE_OLD) {
 309                    ret = ELF_LOAD_WRONG_ARCH;
 310                    goto fail;
 311                }
 312            }
 313            break;
 314        case EM_MOXIE:
 315            if (ehdr.e_machine != EM_MOXIE) {
 316                if (ehdr.e_machine != EM_MOXIE_OLD) {
 317                    ret = ELF_LOAD_WRONG_ARCH;
 318                    goto fail;
 319                }
 320            }
 321            break;
 322        default:
 323            if (elf_machine != ehdr.e_machine) {
 324                ret = ELF_LOAD_WRONG_ARCH;
 325                goto fail;
 326            }
 327    }
 328
 329    if (pentry)
 330        *pentry = (uint64_t)(elf_sword)ehdr.e_entry;
 331
 332    glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb);
 333
 334    size = ehdr.e_phnum * sizeof(phdr[0]);
 335    if (lseek(fd, ehdr.e_phoff, SEEK_SET) != ehdr.e_phoff) {
 336        goto fail;
 337    }
 338    phdr = g_malloc0(size);
 339    if (!phdr)
 340        goto fail;
 341    if (read(fd, phdr, size) != size)
 342        goto fail;
 343    if (must_swab) {
 344        for(i = 0; i < ehdr.e_phnum; i++) {
 345            ph = &phdr[i];
 346            glue(bswap_phdr, SZ)(ph);
 347        }
 348    }
 349
 350    total_size = 0;
 351    for(i = 0; i < ehdr.e_phnum; i++) {
 352        ph = &phdr[i];
 353        if (ph->p_type == PT_LOAD) {
 354            mem_size = ph->p_memsz; /* Size of the ROM */
 355            file_size = ph->p_filesz; /* Size of the allocated data */
 356            data = g_malloc0(file_size);
 357            if (ph->p_filesz > 0) {
 358                if (lseek(fd, ph->p_offset, SEEK_SET) < 0) {
 359                    goto fail;
 360                }
 361                if (read(fd, data, file_size) != file_size) {
 362                    goto fail;
 363                }
 364            }
 365            /* address_offset is hack for kernel images that are
 366               linked at the wrong physical address.  */
 367            if (translate_fn) {
 368                addr = translate_fn(translate_opaque, ph->p_paddr);
 369                glue(elf_reloc, SZ)(&ehdr, fd, must_swab,  translate_fn,
 370                                    translate_opaque, data, ph, elf_machine);
 371            } else {
 372                addr = ph->p_paddr;
 373            }
 374
 375            if (data_swab) {
 376                int j;
 377                for (j = 0; j < file_size; j += (1 << data_swab)) {
 378                    uint8_t *dp = data + j;
 379                    switch (data_swab) {
 380                    case (1):
 381                        *(uint16_t *)dp = bswap16(*(uint16_t *)dp);
 382                        break;
 383                    case (2):
 384                        *(uint32_t *)dp = bswap32(*(uint32_t *)dp);
 385                        break;
 386                    case (3):
 387                        *(uint64_t *)dp = bswap64(*(uint64_t *)dp);
 388                        break;
 389                    default:
 390                        g_assert_not_reached();
 391                    }
 392                }
 393            }
 394
 395            /* the entry pointer in the ELF header is a virtual
 396             * address, if the text segments paddr and vaddr differ
 397             * we need to adjust the entry */
 398            if (pentry && !translate_fn &&
 399                    ph->p_vaddr != ph->p_paddr &&
 400                    ehdr.e_entry >= ph->p_vaddr &&
 401                    ehdr.e_entry < ph->p_vaddr + ph->p_filesz &&
 402                    ph->p_flags & PF_X) {
 403                *pentry = ehdr.e_entry - ph->p_vaddr + ph->p_paddr;
 404            }
 405
 406            snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
 407
 408            /* rom_add_elf_program() seize the ownership of 'data' */
 409            rom_add_elf_program(label, data, file_size, mem_size, addr, as);
 410
 411            total_size += mem_size;
 412            if (addr < low)
 413                low = addr;
 414            if ((addr + mem_size) > high)
 415                high = addr + mem_size;
 416
 417            data = NULL;
 418        }
 419    }
 420    g_free(phdr);
 421    if (lowaddr)
 422        *lowaddr = (uint64_t)(elf_sword)low;
 423    if (highaddr)
 424        *highaddr = (uint64_t)(elf_sword)high;
 425    return total_size;
 426 fail:
 427    g_free(data);
 428    g_free(phdr);
 429    return ret;
 430}
 431