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Diffstat (limited to 'hw/elf_ops.h')
-rw-r--r--hw/elf_ops.h274
1 files changed, 274 insertions, 0 deletions
diff --git a/hw/elf_ops.h b/hw/elf_ops.h
new file mode 100644
index 000000000..8376465a1
--- /dev/null
+++ b/hw/elf_ops.h
@@ -0,0 +1,274 @@
+static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr)
+{
+ bswap16s(&ehdr->e_type); /* Object file type */
+ bswap16s(&ehdr->e_machine); /* Architecture */
+ bswap32s(&ehdr->e_version); /* Object file version */
+ bswapSZs(&ehdr->e_entry); /* Entry point virtual address */
+ bswapSZs(&ehdr->e_phoff); /* Program header table file offset */
+ bswapSZs(&ehdr->e_shoff); /* Section header table file offset */
+ bswap32s(&ehdr->e_flags); /* Processor-specific flags */
+ bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
+ bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
+ bswap16s(&ehdr->e_phnum); /* Program header table entry count */
+ bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
+ bswap16s(&ehdr->e_shnum); /* Section header table entry count */
+ bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
+}
+
+static void glue(bswap_phdr, SZ)(struct elf_phdr *phdr)
+{
+ bswap32s(&phdr->p_type); /* Segment type */
+ bswapSZs(&phdr->p_offset); /* Segment file offset */
+ bswapSZs(&phdr->p_vaddr); /* Segment virtual address */
+ bswapSZs(&phdr->p_paddr); /* Segment physical address */
+ bswapSZs(&phdr->p_filesz); /* Segment size in file */
+ bswapSZs(&phdr->p_memsz); /* Segment size in memory */
+ bswap32s(&phdr->p_flags); /* Segment flags */
+ bswapSZs(&phdr->p_align); /* Segment alignment */
+}
+
+static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr)
+{
+ bswap32s(&shdr->sh_name);
+ bswap32s(&shdr->sh_type);
+ bswapSZs(&shdr->sh_flags);
+ bswapSZs(&shdr->sh_addr);
+ bswapSZs(&shdr->sh_offset);
+ bswapSZs(&shdr->sh_size);
+ bswap32s(&shdr->sh_link);
+ bswap32s(&shdr->sh_info);
+ bswapSZs(&shdr->sh_addralign);
+ bswapSZs(&shdr->sh_entsize);
+}
+
+static void glue(bswap_sym, SZ)(struct elf_sym *sym)
+{
+ bswap32s(&sym->st_name);
+ bswapSZs(&sym->st_value);
+ bswapSZs(&sym->st_size);
+ bswap16s(&sym->st_shndx);
+}
+
+static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,
+ int n, int type)
+{
+ int i;
+ for(i=0;i<n;i++) {
+ if (shdr_table[i].sh_type == type)
+ return shdr_table + i;
+ }
+ return NULL;
+}
+
+static int glue(symfind, SZ)(const void *s0, const void *s1)
+{
+ struct elf_sym *key = (struct elf_sym *)s0;
+ struct elf_sym *sym = (struct elf_sym *)s1;
+ int result = 0;
+ if (key->st_value < sym->st_value) {
+ result = -1;
+ } else if (key->st_value >= sym->st_value + sym->st_size) {
+ result = 1;
+ }
+ return result;
+}
+
+static const char *glue(lookup_symbol, SZ)(struct syminfo *s,
+ target_phys_addr_t orig_addr)
+{
+ struct elf_sym *syms = glue(s->disas_symtab.elf, SZ);
+ struct elf_sym key;
+ struct elf_sym *sym;
+
+ key.st_value = orig_addr;
+
+ sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), glue(symfind, SZ));
+ if (sym != NULL) {
+ return s->disas_strtab + sym->st_name;
+ }
+
+ return "";
+}
+
+static int glue(symcmp, SZ)(const void *s0, const void *s1)
+{
+ struct elf_sym *sym0 = (struct elf_sym *)s0;
+ struct elf_sym *sym1 = (struct elf_sym *)s1;
+ return (sym0->st_value < sym1->st_value)
+ ? -1
+ : ((sym0->st_value > sym1->st_value) ? 1 : 0);
+}
+
+static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
+ int clear_lsb)
+{
+ struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
+ struct elf_sym *syms = NULL;
+ struct syminfo *s;
+ int nsyms, i;
+ char *str = NULL;
+
+ shdr_table = load_at(fd, ehdr->e_shoff,
+ sizeof(struct elf_shdr) * ehdr->e_shnum);
+ if (!shdr_table)
+ return -1;
+
+ if (must_swab) {
+ for (i = 0; i < ehdr->e_shnum; i++) {
+ glue(bswap_shdr, SZ)(shdr_table + i);
+ }
+ }
+
+ symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
+ if (!symtab)
+ goto fail;
+ syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
+ if (!syms)
+ goto fail;
+
+ nsyms = symtab->sh_size / sizeof(struct elf_sym);
+
+ i = 0;
+ while (i < nsyms) {
+ if (must_swab)
+ glue(bswap_sym, SZ)(&syms[i]);
+ /* We are only interested in function symbols.
+ Throw everything else away. */
+ if (syms[i].st_shndx == SHN_UNDEF ||
+ syms[i].st_shndx >= SHN_LORESERVE ||
+ ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
+ nsyms--;
+ if (i < nsyms) {
+ syms[i] = syms[nsyms];
+ }
+ continue;
+ }
+ if (clear_lsb) {
+ /* The bottom address bit marks a Thumb or MIPS16 symbol. */
+ syms[i].st_value &= ~(glue(glue(Elf, SZ), _Addr))1;
+ }
+ i++;
+ }
+ syms = qemu_realloc(syms, nsyms * sizeof(*syms));
+
+ qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
+
+ /* String table */
+ if (symtab->sh_link >= ehdr->e_shnum)
+ goto fail;
+ strtab = &shdr_table[symtab->sh_link];
+
+ str = load_at(fd, strtab->sh_offset, strtab->sh_size);
+ if (!str)
+ goto fail;
+
+ /* Commit */
+ s = qemu_mallocz(sizeof(*s));
+ s->lookup_symbol = glue(lookup_symbol, SZ);
+ glue(s->disas_symtab.elf, SZ) = syms;
+ s->disas_num_syms = nsyms;
+ s->disas_strtab = str;
+ s->next = syminfos;
+ syminfos = s;
+ qemu_free(shdr_table);
+ return 0;
+ fail:
+ qemu_free(syms);
+ qemu_free(str);
+ qemu_free(shdr_table);
+ return -1;
+}
+
+static int glue(load_elf, SZ)(int fd, int64_t address_offset,
+ int must_swab, uint64_t *pentry,
+ uint64_t *lowaddr, uint64_t *highaddr,
+ int elf_machine, int clear_lsb)
+{
+ struct elfhdr ehdr;
+ struct elf_phdr *phdr = NULL, *ph;
+ int size, i, total_size;
+ elf_word mem_size;
+ uint64_t addr, low = (uint64_t)-1, high = 0;
+ uint8_t *data = NULL;
+
+ if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
+ goto fail;
+ if (must_swab) {
+ glue(bswap_ehdr, SZ)(&ehdr);
+ }
+
+ switch (elf_machine) {
+ case EM_PPC64:
+ if (EM_PPC64 != ehdr.e_machine)
+ if (EM_PPC != ehdr.e_machine)
+ goto fail;
+ break;
+ case EM_X86_64:
+ if (EM_X86_64 != ehdr.e_machine)
+ if (EM_386 != ehdr.e_machine)
+ goto fail;
+ break;
+ default:
+ if (elf_machine != ehdr.e_machine)
+ goto fail;
+ }
+
+ if (pentry)
+ *pentry = (uint64_t)(elf_sword)ehdr.e_entry;
+
+ glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb);
+
+ size = ehdr.e_phnum * sizeof(phdr[0]);
+ lseek(fd, ehdr.e_phoff, SEEK_SET);
+ phdr = qemu_mallocz(size);
+ if (!phdr)
+ goto fail;
+ if (read(fd, phdr, size) != size)
+ goto fail;
+ if (must_swab) {
+ for(i = 0; i < ehdr.e_phnum; i++) {
+ ph = &phdr[i];
+ glue(bswap_phdr, SZ)(ph);
+ }
+ }
+
+ total_size = 0;
+ for(i = 0; i < ehdr.e_phnum; i++) {
+ ph = &phdr[i];
+ if (ph->p_type == PT_LOAD) {
+ mem_size = ph->p_memsz;
+ /* XXX: avoid allocating */
+ data = qemu_mallocz(mem_size);
+ if (ph->p_filesz > 0) {
+ if (lseek(fd, ph->p_offset, SEEK_SET) < 0)
+ goto fail;
+ if (read(fd, data, ph->p_filesz) != ph->p_filesz)
+ goto fail;
+ }
+ /* address_offset is hack for kernel images that are
+ linked at the wrong physical address. */
+ addr = ph->p_paddr + address_offset;
+
+ cpu_physical_memory_write_rom(addr, data, mem_size);
+
+ total_size += mem_size;
+ if (addr < low)
+ low = addr;
+ if ((addr + mem_size) > high)
+ high = addr + mem_size;
+
+ qemu_free(data);
+ data = NULL;
+ }
+ }
+ qemu_free(phdr);
+ if (lowaddr)
+ *lowaddr = (uint64_t)(elf_sword)low;
+ if (highaddr)
+ *highaddr = (uint64_t)(elf_sword)high;
+ return total_size;
+ fail:
+ qemu_free(data);
+ qemu_free(phdr);
+ return -1;
+}