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, target_ulong orig_addr)
  77 {
  78     struct elf_sym *syms = glue(s->disas_symtab.elf, SZ);
  79     struct elf_sym key;
  80     struct elf_sym *sym;
  81
  82     key.st_value = orig_addr;
  83
  84     sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), glue(symfind, SZ));
  85     if (sym != 0) {
  86         return s->disas_strtab + sym->st_name;
  87     }
  88
  89     return "";
  90 }
  91
  92 static int glue(symcmp, SZ)(const void *s0, const void *s1)
  93 {
  94     struct elf_sym *sym0 = (struct elf_sym *)s0;
  95     struct elf_sym *sym1 = (struct elf_sym *)s1;
  96     return (sym0->st_value < sym1->st_value)
  97         ? -1
  98         : ((sym0->st_value > sym1->st_value) ? 1 : 0);
  99 }
 100
 101 static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab)
 102 {
 103     struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
 104     struct elf_sym *syms = NULL;
 105     struct syminfo *s;
 106     int nsyms, i;
 107     char *str = NULL;
 108
 109     shdr_table = load_at(fd, ehdr->e_shoff,
 110                          sizeof(struct elf_shdr) * ehdr->e_shnum);
 111     if (!shdr_table)
 112         return -1;
 113
 114     if (must_swab) {
 115         for (i = 0; i < ehdr->e_shnum; i++) {
 116             glue(bswap_shdr, SZ)(shdr_table + i);
 117         }
 118     }
 119
 120     symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
 121     if (!symtab)
 122         goto fail;
 123     syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
 124     if (!syms)
 125         goto fail;
 126
 127     nsyms = symtab->sh_size / sizeof(struct elf_sym);
 128
 129     i = 0;
 130     while (i < nsyms) {
 131         if (must_swab)
 132             glue(bswap_sym, SZ)(&syms[i]);
 133         /* We are only interested in function symbols.
 134            Throw everything else away.  */
 135         if (syms[i].st_shndx == SHN_UNDEF ||
 136                 syms[i].st_shndx >= SHN_LORESERVE ||
 137                 ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
 138             nsyms--;
 139             if (i < nsyms) {
 140                 syms[i] = syms[nsyms];
 141             }
 142             continue;
 143         }
 144 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
 145         /* The bottom address bit marks a Thumb or MIPS16 symbol.  */
 146         syms[i].st_value &= ~(target_ulong)1;
 147 #endif
 148         i++;
 149     }
 150     syms = qemu_realloc(syms, nsyms * sizeof(*syms));
 151
 152     qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
 153
 154     /* String table */
 155     if (symtab->sh_link >= ehdr->e_shnum)
 156         goto fail;
 157     strtab = &shdr_table[symtab->sh_link];
 158
 159     str = load_at(fd, strtab->sh_offset, strtab->sh_size);
 160     if (!str)
 161         goto fail;
 162
 163     /* Commit */
 164     s = qemu_mallocz(sizeof(*s));
 165     s->lookup_symbol = glue(lookup_symbol, SZ);
 166     glue(s->disas_symtab.elf, SZ) = syms;
 167     s->disas_num_syms = nsyms;
 168     s->disas_strtab = str;
 169     s->next = syminfos;
 170     syminfos = s;
 171     qemu_free(shdr_table);
 172     return 0;
 173  fail:
 174     qemu_free(syms);
 175     qemu_free(str);
 176     qemu_free(shdr_table);
 177     return -1;
 178 }
 179
 180 static int glue(load_elf, SZ)(int fd, int64_t address_offset,
 181                               int must_swab, uint64_t *pentry,
 182                               uint64_t *lowaddr, uint64_t *highaddr)
 183 {
 184     struct elfhdr ehdr;
 185     struct elf_phdr *phdr = NULL, *ph;
 186     int size, i, total_size;
 187     elf_word mem_size;
 188     uint64_t addr, low = 0, high = 0;
 189     uint8_t *data = NULL;
 190
 191     if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
 192         goto fail;
 193     if (must_swab) {
 194         glue(bswap_ehdr, SZ)(&ehdr);
 195     }
 196
 197     if (ELF_MACHINE != ehdr.e_machine)
 198         goto fail;
 199
 200     if (pentry)
 201         *pentry = (uint64_t)(elf_sword)ehdr.e_entry;
 202
 203     glue(load_symbols, SZ)(&ehdr, fd, must_swab);
 204
 205     size = ehdr.e_phnum * sizeof(phdr[0]);
 206     lseek(fd, ehdr.e_phoff, SEEK_SET);
 207     phdr = qemu_mallocz(size);
 208     if (!phdr)
 209         goto fail;
 210     if (read(fd, phdr, size) != size)
 211         goto fail;
 212     if (must_swab) {
 213         for(i = 0; i < ehdr.e_phnum; i++) {
 214             ph = &phdr[i];
 215             glue(bswap_phdr, SZ)(ph);
 216         }
 217     }
 218
 219     total_size = 0;
 220     for(i = 0; i < ehdr.e_phnum; i++) {
 221         ph = &phdr[i];
 222         if (ph->p_type == PT_LOAD) {
 223             mem_size = ph->p_memsz;
 224             /* XXX: avoid allocating */
 225             data = qemu_mallocz(mem_size);
 226             if (ph->p_filesz > 0) {
 227                 if (lseek(fd, ph->p_offset, SEEK_SET) < 0)
 228                     goto fail;
 229                 if (read(fd, data, ph->p_filesz) != ph->p_filesz)
 230                     goto fail;
 231             }
 232             /* address_offset is hack for kernel images that are
 233                linked at the wrong physical address.  */
 234             addr = ph->p_paddr + address_offset;
 235
 236             cpu_physical_memory_write_rom(addr, data, mem_size);
 237
 238             total_size += mem_size;
 239             if (!low || addr < low)
 240                 low = addr;
 241             if (!high || (addr + mem_size) > high)
 242                 high = addr + mem_size;
 243
 244             qemu_free(data);
 245             data = NULL;
 246         }
 247     }
 248     qemu_free(phdr);
 249     if (lowaddr)
 250         *lowaddr = (uint64_t)(elf_sword)low;
 251     if (highaddr)
 252         *highaddr = (uint64_t)(elf_sword)high;
 253     return total_size;
 254  fail:
 255     qemu_free(data);
 256     qemu_free(phdr);
 257     return -1;
 258 }