bswap16s(&sym->st_shndx);
}
+static void glue(bswap_rela, SZ)(struct elf_rela *rela)
+{
+ bswapSZs(&rela->r_offset);
+ bswapSZs(&rela->r_info);
+ bswapSZs((elf_word *)&rela->r_addend);
+}
+
static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,
int n, int type)
{
}
static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
- int clear_lsb)
+ int clear_lsb, symbol_fn_t sym_cb)
{
struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
struct elf_sym *syms = NULL;
nsyms = symtab->sh_size / sizeof(struct elf_sym);
+ /* 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;
+ }
+
i = 0;
while (i < nsyms) {
- if (must_swab)
+ if (must_swab) {
glue(bswap_sym, SZ)(&syms[i]);
+ }
+ if (sym_cb) {
+ sym_cb(str + syms[i].st_name, syms[i].st_info,
+ syms[i].st_value, syms[i].st_size);
+ }
/* We are only interested in function symbols.
Throw everything else away. */
if (syms[i].st_shndx == SHN_UNDEF ||
}
}
- /* 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 = g_malloc0(sizeof(*s));
s->lookup_symbol = glue(lookup_symbol, SZ);
return -1;
}
+static int glue(elf_reloc, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
+ uint64_t (*translate_fn)(void *, uint64_t),
+ void *translate_opaque, uint8_t *data,
+ struct elf_phdr *ph, int elf_machine)
+{
+ struct elf_shdr *reltab, *shdr_table = NULL;
+ struct elf_rela *rels = NULL;
+ int nrels, i, ret = -1;
+ elf_word wordval;
+ void *addr;
+
+ 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]);
+ }
+ }
+
+ reltab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_RELA);
+ if (!reltab) {
+ goto fail;
+ }
+ rels = load_at(fd, reltab->sh_offset, reltab->sh_size);
+ if (!rels) {
+ goto fail;
+ }
+ nrels = reltab->sh_size / sizeof(struct elf_rela);
+
+ for (i = 0; i < nrels; i++) {
+ if (must_swab) {
+ glue(bswap_rela, SZ)(&rels[i]);
+ }
+ if (rels[i].r_offset < ph->p_vaddr ||
+ rels[i].r_offset >= ph->p_vaddr + ph->p_filesz) {
+ continue;
+ }
+ addr = &data[rels[i].r_offset - ph->p_vaddr];
+ switch (elf_machine) {
+ case EM_S390:
+ switch (rels[i].r_info) {
+ case R_390_RELATIVE:
+ wordval = *(elf_word *)addr;
+ if (must_swab) {
+ bswapSZs(&wordval);
+ }
+ wordval = translate_fn(translate_opaque, wordval);
+ if (must_swab) {
+ bswapSZs(&wordval);
+ }
+ *(elf_word *)addr = wordval;
+ break;
+ default:
+ fprintf(stderr, "Unsupported relocation type %i!\n",
+ (int)rels[i].r_info);
+ }
+ }
+ }
+
+ ret = 0;
+fail:
+ g_free(rels);
+ g_free(shdr_table);
+ return ret;
+}
+
static int glue(load_elf, SZ)(const char *name, int fd,
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque,
int must_swab, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr,
- int elf_machine, int clear_lsb)
+ int elf_machine, int clear_lsb, int data_swab,
+ AddressSpace *as, bool load_rom,
+ symbol_fn_t sym_cb)
{
struct elfhdr ehdr;
struct elf_phdr *phdr = NULL, *ph;
glue(bswap_ehdr, SZ)(&ehdr);
}
+ if (elf_machine <= EM_NONE) {
+ /* The caller didn't specify an ARCH, we can figure it out */
+ elf_machine = ehdr.e_machine;
+ }
+
switch (elf_machine) {
case EM_PPC64:
- if (EM_PPC64 != ehdr.e_machine)
- if (EM_PPC != ehdr.e_machine) {
+ if (ehdr.e_machine != EM_PPC64) {
+ if (ehdr.e_machine != EM_PPC) {
ret = ELF_LOAD_WRONG_ARCH;
goto fail;
}
+ }
break;
case EM_X86_64:
- if (EM_X86_64 != ehdr.e_machine)
- if (EM_386 != ehdr.e_machine) {
+ if (ehdr.e_machine != EM_X86_64) {
+ if (ehdr.e_machine != EM_386) {
ret = ELF_LOAD_WRONG_ARCH;
goto fail;
}
+ }
break;
case EM_MICROBLAZE:
- if (EM_MICROBLAZE != ehdr.e_machine)
- if (EM_MICROBLAZE_OLD != ehdr.e_machine) {
+ if (ehdr.e_machine != EM_MICROBLAZE) {
+ if (ehdr.e_machine != EM_MICROBLAZE_OLD) {
+ ret = ELF_LOAD_WRONG_ARCH;
+ goto fail;
+ }
+ }
+ break;
+ case EM_MOXIE:
+ if (ehdr.e_machine != EM_MOXIE) {
+ if (ehdr.e_machine != EM_MOXIE_OLD) {
ret = ELF_LOAD_WRONG_ARCH;
goto fail;
}
+ }
+ break;
+ case EM_MIPS:
+ case EM_NANOMIPS:
+ if ((ehdr.e_machine != EM_MIPS) &&
+ (ehdr.e_machine != EM_NANOMIPS)) {
+ ret = ELF_LOAD_WRONG_ARCH;
+ goto fail;
+ }
break;
default:
if (elf_machine != ehdr.e_machine) {
if (pentry)
*pentry = (uint64_t)(elf_sword)ehdr.e_entry;
- glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb);
+ glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb, sym_cb);
size = ehdr.e_phnum * sizeof(phdr[0]);
- lseek(fd, ehdr.e_phoff, SEEK_SET);
+ if (lseek(fd, ehdr.e_phoff, SEEK_SET) != ehdr.e_phoff) {
+ goto fail;
+ }
phdr = g_malloc0(size);
if (!phdr)
goto fail;
goto fail;
}
}
+
+ /* The ELF spec is somewhat vague about the purpose of the
+ * physical address field. One common use in the embedded world
+ * is that physical address field specifies the load address
+ * and the virtual address field specifies the execution address.
+ * Segments are packed into ROM or flash, and the relocation
+ * and zero-initialization of data is done at runtime. This
+ * means that the memsz header represents the runtime size of the
+ * segment, but the filesz represents the loadtime size. If
+ * we try to honour the memsz value for an ELF file like this
+ * we will end up with overlapping segments (which the
+ * loader.c code will later reject).
+ * We support ELF files using this scheme by by checking whether
+ * paddr + memsz for this segment would overlap with any other
+ * segment. If so, then we assume it's using this scheme and
+ * truncate the loaded segment to the filesz size.
+ * If the segment considered as being memsz size doesn't overlap
+ * then we use memsz for the segment length, to handle ELF files
+ * which assume that the loader will do the zero-initialization.
+ */
+ if (mem_size > file_size) {
+ /* If this segment's zero-init portion overlaps another
+ * segment's data or zero-init portion, then truncate this one.
+ * Invalid ELF files where the segments overlap even when
+ * only file_size bytes are loaded will be rejected by
+ * the ROM overlap check in loader.c, so we don't try to
+ * explicitly detect those here.
+ */
+ int j;
+ elf_word zero_start = ph->p_paddr + file_size;
+ elf_word zero_end = ph->p_paddr + mem_size;
+
+ for (j = 0; j < ehdr.e_phnum; j++) {
+ struct elf_phdr *jph = &phdr[j];
+
+ if (i != j && jph->p_type == PT_LOAD) {
+ elf_word other_start = jph->p_paddr;
+ elf_word other_end = jph->p_paddr + jph->p_memsz;
+
+ if (!(other_start >= zero_end ||
+ zero_start >= other_end)) {
+ mem_size = file_size;
+ break;
+ }
+ }
+ }
+ }
+
/* address_offset is hack for kernel images that are
linked at the wrong physical address. */
if (translate_fn) {
addr = translate_fn(translate_opaque, ph->p_paddr);
+ glue(elf_reloc, SZ)(&ehdr, fd, must_swab, translate_fn,
+ translate_opaque, data, ph, elf_machine);
} else {
addr = ph->p_paddr;
}
+ if (data_swab) {
+ int j;
+ for (j = 0; j < file_size; j += (1 << data_swab)) {
+ uint8_t *dp = data + j;
+ switch (data_swab) {
+ case (1):
+ *(uint16_t *)dp = bswap16(*(uint16_t *)dp);
+ break;
+ case (2):
+ *(uint32_t *)dp = bswap32(*(uint32_t *)dp);
+ break;
+ case (3):
+ *(uint64_t *)dp = bswap64(*(uint64_t *)dp);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+ }
+ }
+
/* the entry pointer in the ELF header is a virtual
* address, if the text segments paddr and vaddr differ
* we need to adjust the entry */
*pentry = ehdr.e_entry - ph->p_vaddr + ph->p_paddr;
}
- snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
+ if (mem_size == 0) {
+ /* Some ELF files really do have segments of zero size;
+ * just ignore them rather than trying to create empty
+ * ROM blobs, because the zero-length blob can falsely
+ * trigger the overlapping-ROM-blobs check.
+ */
+ g_free(data);
+ } else {
+ if (load_rom) {
+ snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
- /* rom_add_elf_program() seize the ownership of 'data' */
- rom_add_elf_program(label, data, file_size, mem_size, addr);
+ /* rom_add_elf_program() seize the ownership of 'data' */
+ rom_add_elf_program(label, data, file_size, mem_size,
+ addr, as);
+ } else {
+ address_space_write(as ? as : &address_space_memory,
+ addr, MEMTXATTRS_UNSPECIFIED,
+ data, file_size);
+ g_free(data);
+ }
+ }
total_size += mem_size;
if (addr < low)
projects / qemu.git / blobdiff