LXR qemu/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 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
  63static 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
  76static 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
  93static 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
 102static 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
 192static 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