File:  [Qemu by Fabrice Bellard] / qemu / elf_ops.h
Revision 1.1.1.4 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:30 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

    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: }

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