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(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab)
  64 {
  65     struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
  66     struct elf_sym *syms = NULL;
  67 #if (SZ == 64)
  68     struct elf32_sym *syms32 = NULL;
  69 #endif
  70     struct syminfo *s;
  71     int nsyms, i;
  72     char *str = NULL;
  73
  74     shdr_table = load_at(fd, ehdr->e_shoff,
  75                          sizeof(struct elf_shdr) * ehdr->e_shnum);
  76     if (!shdr_table)
  77         return -1;
  78
  79     if (must_swab) {
  80         for (i = 0; i < ehdr->e_shnum; i++) {
  81             glue(bswap_shdr, SZ)(shdr_table + i);
  82         }
  83     }
  84
  85     symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
  86     if (!symtab)
  87         goto fail;
  88     syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
  89     if (!syms)
  90         goto fail;
  91
  92     nsyms = symtab->sh_size / sizeof(struct elf_sym);
  93 #if (SZ == 64)
  94     syms32 = qemu_mallocz(nsyms * sizeof(struct elf32_sym));
  95 #endif
  96     for (i = 0; i < nsyms; i++) {
  97         if (must_swab)
  98             glue(bswap_sym, SZ)(&syms[i]);
  99 #if (SZ == 64)
 100         syms32[i].st_name = syms[i].st_name;
 101         syms32[i].st_info = syms[i].st_info;
 102         syms32[i].st_other = syms[i].st_other;
 103         syms32[i].st_shndx = syms[i].st_shndx;
 104         syms32[i].st_value = syms[i].st_value & 0xffffffff;
 105         syms32[i].st_size = syms[i].st_size & 0xffffffff;
 106 #endif
 107     }
 108     /* String table */
 109     if (symtab->sh_link >= ehdr->e_shnum)
 110         goto fail;
 111     strtab = &shdr_table[symtab->sh_link];
 112
 113     str = load_at(fd, strtab->sh_offset, strtab->sh_size);
 114     if (!str)
 115         goto fail;
 116
 117     /* Commit */
 118     s = qemu_mallocz(sizeof(*s));
 119 #if (SZ == 64)
 120     s->disas_symtab = syms32;
 121     qemu_free(syms);
 122 #else
 123     s->disas_symtab = syms;
 124 #endif
 125     s->disas_num_syms = nsyms;
 126     s->disas_strtab = str;
 127     s->next = syminfos;
 128     syminfos = s;
 129     qemu_free(shdr_table);
 130     return 0;
 131  fail:
 132 #if (SZ == 64)
 133     qemu_free(syms32);
 134 #endif
 135     qemu_free(syms);
 136     qemu_free(str);
 137     qemu_free(shdr_table);
 138     return -1;
 139 }
 140
 141 static int glue(load_elf, SZ)(int fd, int64_t virt_to_phys_addend,
 142                               int must_swab, uint64_t *pentry,
 143                               uint64_t *lowaddr, uint64_t *highaddr)
 144 {
 145     struct elfhdr ehdr;
 146     struct elf_phdr *phdr = NULL, *ph;
 147     int size, i, total_size;
 148     elf_word mem_size;
 149     uint64_t addr, low = 0, high = 0;
 150     uint8_t *data = NULL;
 151
 152     if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
 153         goto fail;
 154     if (must_swab) {
 155         glue(bswap_ehdr, SZ)(&ehdr);
 156     }
 157
 158     if (ELF_MACHINE != ehdr.e_machine)
 159         goto fail;
 160
 161     if (pentry)
 162         *pentry = (uint64_t)(elf_sword)ehdr.e_entry;
 163
 164     glue(load_symbols, SZ)(&ehdr, fd, must_swab);
 165
 166     size = ehdr.e_phnum * sizeof(phdr[0]);
 167     lseek(fd, ehdr.e_phoff, SEEK_SET);
 168     phdr = qemu_mallocz(size);
 169     if (!phdr)
 170         goto fail;
 171     if (read(fd, phdr, size) != size)
 172         goto fail;
 173     if (must_swab) {
 174         for(i = 0; i < ehdr.e_phnum; i++) {
 175             ph = &phdr[i];
 176             glue(bswap_phdr, SZ)(ph);
 177         }
 178     }
 179
 180     total_size = 0;
 181     for(i = 0; i < ehdr.e_phnum; i++) {
 182         ph = &phdr[i];
 183         if (ph->p_type == PT_LOAD) {
 184             mem_size = ph->p_memsz;
 185             /* XXX: avoid allocating */
 186             data = qemu_mallocz(mem_size);
 187             if (ph->p_filesz > 0) {
 188                 if (lseek(fd, ph->p_offset, SEEK_SET) < 0)
 189                     goto fail;
 190                 if (read(fd, data, ph->p_filesz) != ph->p_filesz)
 191                     goto fail;
 192             }
 193             addr = ph->p_vaddr + virt_to_phys_addend;
 194
 195             cpu_physical_memory_write_rom(addr, data, mem_size);
 196
 197             total_size += mem_size;
 198             if (!low || addr < low)
 199                 low = addr;
 200             if (!high || (addr + mem_size) > high)
 201                 high = addr + mem_size;
 202
 203             qemu_free(data);
 204             data = NULL;
 205         }
 206     }
 207     qemu_free(phdr);
 208     if (lowaddr)
 209         *lowaddr = (uint64_t)(elf_sword)low;
 210     if (highaddr)
 211         *highaddr = (uint64_t)(elf_sword)high;
 212     return total_size;
 213  fail:
 214     qemu_free(data);
 215     qemu_free(phdr);
 216     return -1;
 217 }