}
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 ret;
}
+/*
+ * Given 'nhdr', a pointer to a range of ELF Notes, search through them
+ * for a note matching type 'elf_note_type' and return a pointer to
+ * the matching ELF note.
+ */
+static struct elf_note *glue(get_elf_note_type, SZ)(struct elf_note *nhdr,
+ elf_word note_size,
+ elf_word phdr_align,
+ elf_word elf_note_type)
+{
+ elf_word nhdr_size = sizeof(struct elf_note);
+ elf_word elf_note_entry_offset = 0;
+ elf_word note_type;
+ elf_word nhdr_namesz;
+ elf_word nhdr_descsz;
+
+ if (nhdr == NULL) {
+ return NULL;
+ }
+
+ note_type = nhdr->n_type;
+ while (note_type != elf_note_type) {
+ nhdr_namesz = nhdr->n_namesz;
+ nhdr_descsz = nhdr->n_descsz;
+
+ elf_note_entry_offset = nhdr_size +
+ QEMU_ALIGN_UP(nhdr_namesz, phdr_align) +
+ QEMU_ALIGN_UP(nhdr_descsz, phdr_align);
+
+ /*
+ * If the offset calculated in this iteration exceeds the
+ * supplied size, we are done and no matching note was found.
+ */
+ if (elf_note_entry_offset > note_size) {
+ return NULL;
+ }
+
+ /* skip to the next ELF Note entry */
+ nhdr = (void *)nhdr + elf_note_entry_offset;
+ note_type = nhdr->n_type;
+ }
+
+ return nhdr;
+}
+
static int glue(load_elf, SZ)(const char *name, int fd,
+ uint64_t (*elf_note_fn)(void *, void *, bool),
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 data_swab,
- AddressSpace *as, bool load_rom)
+ AddressSpace *as, bool load_rom,
+ symbol_fn_t sym_cb)
{
struct elfhdr ehdr;
struct elf_phdr *phdr = NULL, *ph;
}
}
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) {
ret = ELF_LOAD_WRONG_ARCH;
}
if (pentry)
- *pentry = (uint64_t)(elf_sword)ehdr.e_entry;
+ *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]);
if (lseek(fd, ehdr.e_phoff, SEEK_SET) != ehdr.e_phoff) {
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) {
*pentry = ehdr.e_entry - ph->p_vaddr + ph->p_paddr;
}
- 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, as);
- } else {
- cpu_physical_memory_write(addr, data, file_size);
+ 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, as);
+ } else {
+ address_space_write(as ? as : &address_space_memory,
+ addr, MEMTXATTRS_UNSPECIFIED,
+ data, file_size);
+ g_free(data);
+ }
}
total_size += mem_size;
high = addr + mem_size;
data = NULL;
+
+ } else if (ph->p_type == PT_NOTE && elf_note_fn) {
+ struct elf_note *nhdr = NULL;
+
+ file_size = ph->p_filesz; /* Size of the range of ELF notes */
+ data = g_malloc0(file_size);
+ if (ph->p_filesz > 0) {
+ if (lseek(fd, ph->p_offset, SEEK_SET) < 0) {
+ goto fail;
+ }
+ if (read(fd, data, file_size) != file_size) {
+ goto fail;
+ }
+ }
+
+ /*
+ * Search the ELF notes to find one with a type matching the
+ * value passed in via 'translate_opaque'
+ */
+ nhdr = (struct elf_note *)data;
+ assert(translate_opaque != NULL);
+ nhdr = glue(get_elf_note_type, SZ)(nhdr, file_size, ph->p_align,
+ *(uint64_t *)translate_opaque);
+ if (nhdr != NULL) {
+ bool is64 =
+ sizeof(struct elf_note) == sizeof(struct elf64_note);
+ elf_note_fn((void *)nhdr, (void *)&ph->p_align, is64);
+ }
+ g_free(data);
+ data = NULL;
}
}
+
g_free(phdr);
if (lowaddr)
*lowaddr = (uint64_t)(elf_sword)low;
projects / qemu.git / blobdiff