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     syms = qemu_realloc(syms, nsyms * sizeof(*syms));
 153
 154     qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
 155
 156     /* String table */
 157     if (symtab->sh_link >= ehdr->e_shnum)
 158         goto fail;
 159     strtab = &shdr_table[symtab->sh_link];
 160
 161     str = load_at(fd, strtab->sh_offset, strtab->sh_size);
 162     if (!str)
 163         goto fail;
 164
 165     /* Commit */
 166     s = qemu_mallocz(sizeof(*s));
 167     s->lookup_symbol = glue(lookup_symbol, SZ);
 168     glue(s->disas_symtab.elf, SZ) = syms;
 169     s->disas_num_syms = nsyms;
 170     s->disas_strtab = str;
 171     s->next = syminfos;
 172     syminfos = s;
 173     qemu_free(shdr_table);
 174     return 0;
 175  fail:
 176     qemu_free(syms);
 177     qemu_free(str);
 178     qemu_free(shdr_table);
 179     return -1;
 180 }
 181
 182 static int glue(load_elf, SZ)(const char *name, int fd, int64_t address_offset,
 183                               int must_swab, uint64_t *pentry,
 184                               uint64_t *lowaddr, uint64_t *highaddr,
 185                               int elf_machine, int clear_lsb)
 186 {
 187     struct elfhdr ehdr;
 188     struct elf_phdr *phdr = NULL, *ph;
 189     int size, i, total_size;
 190     elf_word mem_size;
 191     uint64_t addr, low = (uint64_t)-1, high = 0;
 192     uint8_t *data = NULL;
 193     char label[128];
 194
 195     if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
 196         goto fail;
 197     if (must_swab) {
 198         glue(bswap_ehdr, SZ)(&ehdr);
 199     }
 200
 201     switch (elf_machine) {
 202         case EM_PPC64:
 203             if (EM_PPC64 != ehdr.e_machine)
 204                 if (EM_PPC != ehdr.e_machine)
 205                     goto fail;
 206             break;
 207         case EM_X86_64:
 208             if (EM_X86_64 != ehdr.e_machine)
 209                 if (EM_386 != ehdr.e_machine)
 210                     goto fail;
 211             break;
 212         default:
 213             if (elf_machine != ehdr.e_machine)
 214                 goto fail;
 215     }
 216
 217     if (pentry)
 218         *pentry = (uint64_t)(elf_sword)ehdr.e_entry;
 219
 220     glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb);
 221
 222     size = ehdr.e_phnum * sizeof(phdr[0]);
 223     lseek(fd, ehdr.e_phoff, SEEK_SET);
 224     phdr = qemu_mallocz(size);
 225     if (!phdr)
 226         goto fail;
 227     if (read(fd, phdr, size) != size)
 228         goto fail;
 229     if (must_swab) {
 230         for(i = 0; i < ehdr.e_phnum; i++) {
 231             ph = &phdr[i];
 232             glue(bswap_phdr, SZ)(ph);
 233         }
 234     }
 235
 236     total_size = 0;
 237     for(i = 0; i < ehdr.e_phnum; i++) {
 238         ph = &phdr[i];
 239         if (ph->p_type == PT_LOAD) {
 240             mem_size = ph->p_memsz;
 241             /* XXX: avoid allocating */
 242             data = qemu_mallocz(mem_size);
 243             if (ph->p_filesz > 0) {
 244                 if (lseek(fd, ph->p_offset, SEEK_SET) < 0)
 245                     goto fail;
 246                 if (read(fd, data, ph->p_filesz) != ph->p_filesz)
 247                     goto fail;
 248             }
 249             /* address_offset is hack for kernel images that are
 250                linked at the wrong physical address.  */
 251             addr = ph->p_paddr + address_offset;
 252
 253             snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
 254             rom_add_blob_fixed(label, data, mem_size, addr);
 255
 256             total_size += mem_size;
 257             if (addr < low)
 258                 low = addr;
 259             if ((addr + mem_size) > high)
 260                 high = addr + mem_size;
 261
 262             qemu_free(data);
 263             data = NULL;
 264         }
 265     }
 266     qemu_free(phdr);
 267     if (lowaddr)
 268         *lowaddr = (uint64_t)(elf_sword)low;
 269     if (highaddr)
 270         *highaddr = (uint64_t)(elf_sword)high;
 271     return total_size;
 272  fail:
 273     qemu_free(data);
 274     qemu_free(phdr);
 275     return -1;
 276 }