/*
* With the file (fd) open on the image, and (ehdr) containing
* the Elf header, load the image at (off)
*/
static int
__elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
{
Elf_Ehdr *hdr;
Elf_Shdr *shdr, *cshdr, *lshdr;
vm_offset_t firstaddr, lastaddr;
int i, nsym, res, ret, shdrbytes, symstrindex;
ret = 0;
firstaddr = lastaddr = (vm_offset_t)off;
hdr = &ef->hdr;
ef->off = (vm_offset_t)off;
/* Read in the section headers. */
shdrbytes = hdr->e_shnum * hdr->e_shentsize;
shdr = alloc_pread(ef->fd, (off_t)hdr->e_shoff, shdrbytes);
if (shdr == NULL) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_obj_loadimage: read section headers failed\n");
goto out;
}
ef->e_shdr = shdr;
/*
* Decide where to load everything, but don't read it yet.
* We store the load address as a non-zero sh_addr value.
* Start with the code/data and bss.
*/
for (i = 0; i < hdr->e_shnum; i++)
shdr[i].sh_addr = 0;
for (i = 0; i < hdr->e_shnum; i++) {
if (shdr[i].sh_size == 0)
continue;
switch (shdr[i].sh_type) {
case SHT_PROGBITS:
case SHT_NOBITS:
lastaddr = roundup(lastaddr, shdr[i].sh_addralign);
shdr[i].sh_addr = (Elf_Addr)lastaddr;
lastaddr += shdr[i].sh_size;
break;
}
}
/* Symbols. */
nsym = 0;
for (i = 0; i < hdr->e_shnum; i++) {
switch (shdr[i].sh_type) {
case SHT_SYMTAB:
nsym++;
ef->symtabindex = i;
shdr[i].sh_addr = (Elf_Addr)lastaddr;
lastaddr += shdr[i].sh_size;
break;
}
}
if (nsym != 1) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_obj_loadimage: file has no valid symbol table\n");
goto out;
}
lastaddr = roundup(lastaddr, shdr[ef->symtabindex].sh_addralign);
shdr[ef->symtabindex].sh_addr = (Elf_Addr)lastaddr;
lastaddr += shdr[ef->symtabindex].sh_size;
symstrindex = shdr[ef->symtabindex].sh_link;
if (symstrindex < 0 || symstrindex >= hdr->e_shnum ||
shdr[symstrindex].sh_type != SHT_STRTAB) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_obj_loadimage: file has invalid symbol strings\n");
goto out;
}
lastaddr = roundup(lastaddr, shdr[symstrindex].sh_addralign);
shdr[symstrindex].sh_addr = (Elf_Addr)lastaddr;
lastaddr += shdr[symstrindex].sh_size;
/* Section names. */
if (hdr->e_shstrndx == 0 || hdr->e_shstrndx >= hdr->e_shnum ||
shdr[hdr->e_shstrndx].sh_type != SHT_STRTAB) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_obj_loadimage: file has no section names\n");
goto out;
}
ef->shstrindex = hdr->e_shstrndx;
lastaddr = roundup(lastaddr, shdr[ef->shstrindex].sh_addralign);
shdr[ef->shstrindex].sh_addr = (Elf_Addr)lastaddr;
lastaddr += shdr[ef->shstrindex].sh_size;
/* Relocation tables. */
for (i = 0; i < hdr->e_shnum; i++) {
switch (shdr[i].sh_type) {
case SHT_REL:
case SHT_RELA:
lastaddr = roundup(lastaddr, shdr[i].sh_addralign);
shdr[i].sh_addr = (Elf_Addr)lastaddr;
lastaddr += shdr[i].sh_size;
break;
}
}
/* Clear the whole area, including bss regions. */
kern_bzero(firstaddr, lastaddr - firstaddr);
/* Figure section with the lowest file offset we haven't loaded yet. */
for (cshdr = NULL; /* none */; /* none */)
{
/*
* Find next section to load. The complexity of this loop is
* O(n^2), but with the number of sections being typically
* small, we do not care.
*/
lshdr = cshdr;
for (i = 0; i < hdr->e_shnum; i++) {
if (shdr[i].sh_addr == 0 ||
shdr[i].sh_type == SHT_NOBITS)
continue;
/* Skip sections that were loaded already. */
if (lshdr != NULL &&
lshdr->sh_offset >= shdr[i].sh_offset)
continue;
/* Find section with smallest offset. */
if (cshdr == lshdr ||
cshdr->sh_offset > shdr[i].sh_offset)
cshdr = &shdr[i];
}
if (cshdr == lshdr)
break;
if (kern_pread(ef->fd, (vm_offset_t)cshdr->sh_addr,
cshdr->sh_size, (off_t)cshdr->sh_offset) != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_obj_loadimage: read failed\n");
goto out;
}
}
file_addmetadata(fp, MODINFOMD_SHDR, shdrbytes, shdr);
res = __elfN(obj_parse_modmetadata)(fp, ef);
if (res != 0)
goto out;
ret = lastaddr - firstaddr;
fp->f_addr = firstaddr;
printf("size 0x%lx at 0x%lx", (u_long)ret, (u_long)firstaddr);
out:
printf("\n");
return ret;
}
/*
* With the file (fd) open on the image, and (ehdr) containing
* the Elf header, load the image at (off)
*/
static int
__elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
{
int i;
u_int j;
Elf_Ehdr *ehdr;
Elf_Phdr *phdr, *php;
Elf_Shdr *shdr;
char *shstr;
int ret;
vm_offset_t firstaddr;
vm_offset_t lastaddr;
size_t chunk;
ssize_t result;
Elf_Addr ssym, esym;
Elf_Dyn *dp;
Elf_Addr adp;
Elf_Addr ctors;
int ndp;
int symstrindex;
int symtabindex;
Elf_Size size;
u_int fpcopy;
Elf_Sym sym;
Elf_Addr p_start, p_end;
dp = NULL;
shdr = NULL;
ret = 0;
firstaddr = lastaddr = 0;
ehdr = ef->ehdr;
if (ehdr->e_type == ET_EXEC) {
#if defined(__i386__) || defined(__amd64__)
#if __ELF_WORD_SIZE == 64
off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */
#else
off = - (off & 0xff000000u); /* i386 relocates after locore */
#endif
#elif defined(__powerpc__)
/*
* On the purely virtual memory machines like e500, the kernel is
* linked against its final VA range, which is most often not
* available at the loader stage, but only after kernel initializes
* and completes its VM settings. In such cases we cannot use p_vaddr
* field directly to load ELF segments, but put them at some
* 'load-time' locations.
*/
if (off & 0xf0000000u) {
off = -(off & 0xf0000000u);
/*
* XXX the physical load address should not be hardcoded. Note
* that the Book-E kernel assumes that it's loaded at a 16MB
* boundary for now...
*/
off += 0x01000000;
ehdr->e_entry += off;
#ifdef ELF_VERBOSE
printf("Converted entry 0x%08x\n", ehdr->e_entry);
#endif
} else
off = 0;
#elif defined(__arm__) && !defined(EFI)
/*
* The elf headers in arm kernels specify virtual addresses in all
* header fields, even the ones that should be physical addresses.
* We assume the entry point is in the first page, and masking the page
* offset will leave us with the virtual address the kernel was linked
* at. We subtract that from the load offset, making 'off' into the
* value which, when added to a virtual address in an elf header,
* translates it to a physical address. We do the va->pa conversion on
* the entry point address in the header now, so that later we can
* launch the kernel by just jumping to that address.
*
* When booting from UEFI the copyin and copyout functions handle
* adjusting the location relative to the first virtual address.
* Because of this there is no need to adjust the offset or entry
* point address as these will both be handled by the efi code.
*/
off -= ehdr->e_entry & ~PAGE_MASK;
ehdr->e_entry += off;
#ifdef ELF_VERBOSE
printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n", ehdr->e_entry, off);
#endif
#else
off = 0; /* other archs use direct mapped kernels */
#endif
}
ef->off = off;
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
/* use entry address from header */
fp->f_addr = ehdr->e_entry;
}
if (ef->kernel)
__elfN(relocation_offset) = off;
if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: program header not within first page\n");
goto out;
}
phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
for (i = 0; i < ehdr->e_phnum; i++) {
/* We want to load PT_LOAD segments only.. */
if (phdr[i].p_type != PT_LOAD)
continue;
#ifdef ELF_VERBOSE
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
(long)(phdr[i].p_paddr + off),
(long)(phdr[i].p_paddr + off + phdr[i].p_memsz - 1));
} else {
printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
(long)(phdr[i].p_vaddr + off),
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
}
#else
if ((phdr[i].p_flags & PF_W) == 0) {
printf("text=0x%lx ", (long)phdr[i].p_filesz);
} else {
printf("data=0x%lx", (long)phdr[i].p_filesz);
if (phdr[i].p_filesz < phdr[i].p_memsz)
printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz));
printf(" ");
}
#endif
fpcopy = 0;
if (ef->firstlen > phdr[i].p_offset) {
fpcopy = ef->firstlen - phdr[i].p_offset;
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
phdr[i].p_paddr + off, fpcopy);
} else {
archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
phdr[i].p_vaddr + off, fpcopy);
}
}
if (phdr[i].p_filesz > fpcopy) {
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
if (kern_pread(ef->fd, phdr[i].p_paddr + off + fpcopy,
phdr[i].p_filesz - fpcopy,
phdr[i].p_offset + fpcopy) != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: read failed\n");
goto out;
}
} else {
if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
phdr[i].p_filesz - fpcopy,
phdr[i].p_offset + fpcopy) != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: read failed\n");
goto out;
}
}
}
/* clear space from oversized segments; eg: bss */
if (phdr[i].p_filesz < phdr[i].p_memsz) {
#ifdef ELF_VERBOSE
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
printf(" (bss: 0x%lx-0x%lx)",
(long)(phdr[i].p_paddr + off + phdr[i].p_filesz),
(long)(phdr[i].p_paddr + off + phdr[i].p_memsz - 1));
} else {
printf(" (bss: 0x%lx-0x%lx)",
(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
}
#endif
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
kern_bzero(phdr[i].p_paddr + off + phdr[i].p_filesz,
phdr[i].p_memsz - phdr[i].p_filesz);
} else {
kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
phdr[i].p_memsz - phdr[i].p_filesz);
}
}
#ifdef ELF_VERBOSE
printf("\n");
#endif
if (archsw.arch_loadseg != NULL)
archsw.arch_loadseg(ehdr, phdr + i, off);
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
if (firstaddr == 0 || firstaddr > (phdr[i].p_paddr + off))
firstaddr = phdr[i].p_paddr + off;
if (lastaddr == 0 ||
lastaddr < (phdr[i].p_paddr + off + phdr[i].p_memsz))
lastaddr = phdr[i].p_paddr + off + phdr[i].p_memsz;
} else {
if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
firstaddr = phdr[i].p_vaddr + off;
if (lastaddr == 0 ||
lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
}
}
lastaddr = roundup(lastaddr, sizeof(long));
/*
* Get the section headers. We need this for finding the .ctors
* section as well as for loading any symbols. Both may be hard
* to do if reading from a .gz file as it involves seeking. I
* think the rule is going to have to be that you must strip a
* file to remove symbols before gzipping it.
*/
chunk = ehdr->e_shnum * ehdr->e_shentsize;
if (chunk == 0 || ehdr->e_shoff == 0)
goto nosyms;
shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
if (shdr == NULL) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: failed to read section headers");
goto nosyms;
}
file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
/*
* Read the section string table and look for the .ctors section.
* We need to tell the kernel where it is so that it can call the
* ctors.
*/
chunk = shdr[ehdr->e_shstrndx].sh_size;
if (chunk) {
shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset, chunk);
if (shstr) {
for (i = 0; i < ehdr->e_shnum; i++) {
if (strcmp(shstr + shdr[i].sh_name, ".ctors") != 0)
continue;
ctors = shdr[i].sh_addr;
file_addmetadata(fp, MODINFOMD_CTORS_ADDR, sizeof(ctors),
&ctors);
size = shdr[i].sh_size;
file_addmetadata(fp, MODINFOMD_CTORS_SIZE, sizeof(size),
&size);
break;
}
free(shstr);
}
}
/*
* Now load any symbols.
*/
symtabindex = -1;
symstrindex = -1;
for (i = 0; i < ehdr->e_shnum; i++) {
if (shdr[i].sh_type != SHT_SYMTAB)
continue;
for (j = 0; j < ehdr->e_phnum; j++) {
if (phdr[j].p_type != PT_LOAD)
continue;
if (shdr[i].sh_offset >= phdr[j].p_offset &&
(shdr[i].sh_offset + shdr[i].sh_size <=
phdr[j].p_offset + phdr[j].p_filesz)) {
shdr[i].sh_offset = 0;
shdr[i].sh_size = 0;
break;
}
}
if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
continue; /* alread loaded in a PT_LOAD above */
/* Save it for loading below */
symtabindex = i;
symstrindex = shdr[i].sh_link;
}
if (symtabindex < 0 || symstrindex < 0)
goto nosyms;
/* Ok, committed to a load. */
#ifndef ELF_VERBOSE
printf("syms=[");
#endif
ssym = lastaddr;
for (i = symtabindex; i >= 0; i = symstrindex) {
#ifdef ELF_VERBOSE
char *secname;
switch(shdr[i].sh_type) {
case SHT_SYMTAB: /* Symbol table */
secname = "symtab";
break;
case SHT_STRTAB: /* String table */
secname = "strtab";
break;
default:
secname = "WHOA!!";
break;
}
#endif
size = shdr[i].sh_size;
archsw.arch_copyin(&size, lastaddr, sizeof(size));
lastaddr += sizeof(size);
#ifdef ELF_VERBOSE
printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
(uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
(uintmax_t)lastaddr, (uintmax_t)(lastaddr + shdr[i].sh_size));
#else
if (i == symstrindex)
printf("+");
printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
#endif
if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not seek for symbols - skipped!");
lastaddr = ssym;
ssym = 0;
goto nosyms;
}
result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
if (result < 0 || (size_t)result != shdr[i].sh_size) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not read symbols - skipped! (%ju != %ju)", (uintmax_t)result,
(uintmax_t)shdr[i].sh_size);
lastaddr = ssym;
ssym = 0;
goto nosyms;
}
/* Reset offsets relative to ssym */
lastaddr += shdr[i].sh_size;
lastaddr = roundup(lastaddr, sizeof(size));
if (i == symtabindex)
symtabindex = -1;
else if (i == symstrindex)
symstrindex = -1;
}
esym = lastaddr;
#ifndef ELF_VERBOSE
printf("]");
#endif
file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
nosyms:
printf("\n");
ret = lastaddr - firstaddr;
if (ehdr->e_ident[EI_OSABI] != ELFOSABI_SOLARIS)
fp->f_addr = firstaddr;
php = NULL;
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_type == PT_DYNAMIC) {
php = phdr + i;
adp = php->p_vaddr;
file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), &adp);
break;
}
}
if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
goto out;
ndp = php->p_filesz / sizeof(Elf_Dyn);
if (ndp == 0)
goto out;
dp = malloc(php->p_filesz);
if (dp == NULL)
goto out;
if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS)
archsw.arch_copyout(php->p_paddr + off, dp, php->p_filesz);
else
archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
ef->strsz = 0;
for (i = 0; i < ndp; i++) {
if (dp[i].d_tag == 0)
break;
switch (dp[i].d_tag) {
case DT_HASH:
ef->hashtab = (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_STRTAB:
ef->strtab = (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_STRSZ:
ef->strsz = dp[i].d_un.d_val;
break;
case DT_SYMTAB:
ef->symtab = (Elf_Sym*)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_REL:
ef->rel = (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_RELSZ:
ef->relsz = dp[i].d_un.d_val;
break;
case DT_RELA:
ef->rela = (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_RELASZ:
ef->relasz = dp[i].d_un.d_val;
break;
default:
break;
}
}
if (ef->hashtab == NULL || ef->symtab == NULL ||
ef->strtab == NULL || ef->strsz == 0)
goto out;
COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
ef->buckets = ef->hashtab + 2;
ef->chains = ef->buckets + ef->nbuckets;
if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set", &sym) != 0)
return 0;
p_start = sym.st_value + ef->off;
if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set", &sym) != 0)
return ENOENT;
p_end = sym.st_value + ef->off;
if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
goto out;
if (ef->kernel) /* kernel must not depend on anything */
goto out;
out:
if (dp)
free(dp);
if (shdr)
free(shdr);
return ret;
}
int
__elfN(load_modmetadata)(struct preloaded_file *fp, u_int64_t dest)
{
struct elf_file ef;
int err, i, j;
Elf_Shdr *sh_meta, *shdr = NULL;
Elf_Shdr *sh_data[2];
char *shstrtab = NULL;
size_t size;
Elf_Addr p_start, p_end;
bzero(&ef, sizeof(struct elf_file));
ef.fd = -1;
err = __elfN(load_elf_header)(fp->f_name, &ef);
if (err != 0)
goto out;
if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
ef.kernel = 1;
} else if (ef.ehdr->e_type != ET_DYN) {
err = EFTYPE;
goto out;
}
size = ef.ehdr->e_shnum * ef.ehdr->e_shentsize;
shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
if (shdr == NULL) {
err = ENOMEM;
goto out;
}
/* Load shstrtab. */
shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
shdr[ef.ehdr->e_shstrndx].sh_size);
if (shstrtab == NULL) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"load_modmetadata: unable to load shstrtab\n");
err = EFTYPE;
goto out;
}
/* Find set_modmetadata_set and data sections. */
sh_data[0] = sh_data[1] = sh_meta = NULL;
for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
if (strcmp(&shstrtab[shdr[i].sh_name],
"set_modmetadata_set") == 0) {
sh_meta = &shdr[i];
}
if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
(strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
sh_data[j++] = &shdr[i];
}
}
if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"load_modmetadata: unable to find set_modmetadata_set or data sections\n");
err = EFTYPE;
goto out;
}
/* Load set_modmetadata_set into memory */
err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
if (err != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
goto out;
}
p_start = dest;
p_end = dest + sh_meta->sh_size;
dest += sh_meta->sh_size;
/* Load data sections into memory. */
err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
sh_data[0]->sh_offset);
if (err != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"load_modmetadata: unable to load data: %d\n", err);
goto out;
}
/*
* We have to increment the dest, so that the offset is the same into
* both the .rodata and .data sections.
*/
ef.off = -(sh_data[0]->sh_addr - dest);
dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
sh_data[1]->sh_offset);
if (err != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"load_modmetadata: unable to load data: %d\n", err);
goto out;
}
err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
if (err != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"load_modmetadata: unable to parse metadata: %d\n", err);
goto out;
}
out:
if (shstrtab != NULL)
free(shstrtab);
if (shdr != NULL)
free(shdr);
if (ef.firstpage != NULL)
free(ef.firstpage);
if (ef.fd != -1)
close(ef.fd);
return (err);
}
/*
* With the file (fd) open on the image, and (ehdr) containing
* the Elf header, load the image at (off)
*/
static int
__elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
{
int i;
u_int j;
Elf_Ehdr *ehdr;
Elf_Phdr *phdr, *php;
Elf_Shdr *shdr;
int ret;
vm_offset_t firstaddr;
vm_offset_t lastaddr;
size_t chunk;
ssize_t result;
Elf_Addr ssym, esym;
Elf_Dyn *dp;
Elf_Addr adp;
int ndp;
int symstrindex;
int symtabindex;
Elf_Size size;
u_int fpcopy;
dp = NULL;
shdr = NULL;
ret = 0;
firstaddr = lastaddr = 0;
ehdr = ef->ehdr;
if (ef->kernel) {
#if defined(__i386__) || defined(__amd64__)
#if __ELF_WORD_SIZE == 64
off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */
#else
off = - (off & 0xff000000u); /* i386 relocates after locore */
#endif
#elif defined(__powerpc__)
/*
* On the purely virtual memory machines like e500, the kernel is
* linked against its final VA range, which is most often not
* available at the loader stage, but only after kernel initializes
* and completes its VM settings. In such cases we cannot use p_vaddr
* field directly to load ELF segments, but put them at some
* 'load-time' locations.
*/
if (off & 0xf0000000u) {
off = -(off & 0xf0000000u);
/*
* XXX the physical load address should not be hardcoded. Note
* that the Book-E kernel assumes that it's loaded at a 16MB
* boundary for now...
*/
off += 0x01000000;
ehdr->e_entry += off;
#ifdef ELF_VERBOSE
printf("Converted entry 0x%08x\n", ehdr->e_entry);
#endif
} else
off = 0;
#elif defined(__arm__)
/*
* The elf headers in some kernels specify virtual addresses in all
* header fields. More recently, the e_entry and p_paddr fields are the
* proper physical addresses. Even when the p_paddr fields are correct,
* the MI code below uses the p_vaddr fields with an offset added for
* loading (doing so is arguably wrong). To make loading work, we need
* an offset that represents the difference between physical and virtual
* addressing. ARM kernels are always linked at 0xCnnnnnnn. Depending
* on the headers, the offset value passed in may be physical or virtual
* (because it typically comes from e_entry), but we always replace
* whatever is passed in with the va<->pa offset. On the other hand, we
* always remove the high-order part of the entry address whether it's
* physical or virtual, because it will be adjusted later for the actual
* physical entry point based on where the image gets loaded.
*/
off = -0xc0000000;
ehdr->e_entry &= ~0xf0000000;
#ifdef ELF_VERBOSE
printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n", ehdr->e_entry, off);
#endif
#else
off = 0; /* other archs use direct mapped kernels */
#endif
__elfN(relocation_offset) = off;
}
ef->off = off;
if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: program header not within first page\n");
goto out;
}
phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
for (i = 0; i < ehdr->e_phnum; i++) {
/* We want to load PT_LOAD segments only.. */
if (phdr[i].p_type != PT_LOAD)
continue;
#ifdef ELF_VERBOSE
printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
(long)(phdr[i].p_vaddr + off),
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
#else
if ((phdr[i].p_flags & PF_W) == 0) {
printf("text=0x%lx ", (long)phdr[i].p_filesz);
} else {
printf("data=0x%lx", (long)phdr[i].p_filesz);
if (phdr[i].p_filesz < phdr[i].p_memsz)
printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz));
printf(" ");
}
#endif
fpcopy = 0;
if (ef->firstlen > phdr[i].p_offset) {
fpcopy = ef->firstlen - phdr[i].p_offset;
archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
phdr[i].p_vaddr + off, fpcopy);
}
if (phdr[i].p_filesz > fpcopy) {
if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
phdr[i].p_filesz - fpcopy, phdr[i].p_offset + fpcopy) != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: read failed\n");
goto out;
}
}
/* clear space from oversized segments; eg: bss */
if (phdr[i].p_filesz < phdr[i].p_memsz) {
#ifdef ELF_VERBOSE
printf(" (bss: 0x%lx-0x%lx)",
(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
#endif
kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
phdr[i].p_memsz - phdr[i].p_filesz);
}
#ifdef ELF_VERBOSE
printf("\n");
#endif
if (archsw.arch_loadseg != NULL)
archsw.arch_loadseg(ehdr, phdr + i, off);
if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
firstaddr = phdr[i].p_vaddr + off;
if (lastaddr == 0 || lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
}
lastaddr = roundup(lastaddr, sizeof(long));
/*
* Now grab the symbol tables. This isn't easy if we're reading a
* .gz file. I think the rule is going to have to be that you must
* strip a file to remove symbols before gzipping it so that we do not
* try to lseek() on it.
*/
chunk = ehdr->e_shnum * ehdr->e_shentsize;
if (chunk == 0 || ehdr->e_shoff == 0)
goto nosyms;
shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
if (shdr == NULL) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: failed to read section headers");
goto nosyms;
}
file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
symtabindex = -1;
symstrindex = -1;
for (i = 0; i < ehdr->e_shnum; i++) {
if (shdr[i].sh_type != SHT_SYMTAB)
continue;
for (j = 0; j < ehdr->e_phnum; j++) {
if (phdr[j].p_type != PT_LOAD)
continue;
if (shdr[i].sh_offset >= phdr[j].p_offset &&
(shdr[i].sh_offset + shdr[i].sh_size <=
phdr[j].p_offset + phdr[j].p_filesz)) {
shdr[i].sh_offset = 0;
shdr[i].sh_size = 0;
break;
}
}
if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
continue; /* alread loaded in a PT_LOAD above */
/* Save it for loading below */
symtabindex = i;
symstrindex = shdr[i].sh_link;
}
if (symtabindex < 0 || symstrindex < 0)
goto nosyms;
/* Ok, committed to a load. */
#ifndef ELF_VERBOSE
printf("syms=[");
#endif
ssym = lastaddr;
for (i = symtabindex; i >= 0; i = symstrindex) {
#ifdef ELF_VERBOSE
char *secname;
switch(shdr[i].sh_type) {
case SHT_SYMTAB: /* Symbol table */
secname = "symtab";
break;
case SHT_STRTAB: /* String table */
secname = "strtab";
break;
default:
secname = "WHOA!!";
break;
}
#endif
size = shdr[i].sh_size;
archsw.arch_copyin(&size, lastaddr, sizeof(size));
lastaddr += sizeof(size);
#ifdef ELF_VERBOSE
printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
(uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
(uintmax_t)lastaddr, (uintmax_t)(lastaddr + shdr[i].sh_size));
#else
if (i == symstrindex)
printf("+");
printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
#endif
if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not seek for symbols - skipped!");
lastaddr = ssym;
ssym = 0;
goto nosyms;
}
result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
if (result < 0 || (size_t)result != shdr[i].sh_size) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not read symbols - skipped! (%ju != %ju)", (uintmax_t)result,
(uintmax_t)shdr[i].sh_size);
lastaddr = ssym;
ssym = 0;
goto nosyms;
}
/* Reset offsets relative to ssym */
lastaddr += shdr[i].sh_size;
lastaddr = roundup(lastaddr, sizeof(size));
if (i == symtabindex)
symtabindex = -1;
else if (i == symstrindex)
symstrindex = -1;
}
esym = lastaddr;
#ifndef ELF_VERBOSE
printf("]");
#endif
file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
nosyms:
printf("\n");
ret = lastaddr - firstaddr;
fp->f_addr = firstaddr;
php = NULL;
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_type == PT_DYNAMIC) {
php = phdr + i;
adp = php->p_vaddr;
file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), &adp);
break;
}
}
if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
goto out;
ndp = php->p_filesz / sizeof(Elf_Dyn);
if (ndp == 0)
goto out;
dp = malloc(php->p_filesz);
if (dp == NULL)
goto out;
archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
ef->strsz = 0;
for (i = 0; i < ndp; i++) {
if (dp[i].d_tag == 0)
break;
switch (dp[i].d_tag) {
case DT_HASH:
ef->hashtab = (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_STRTAB:
ef->strtab = (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_STRSZ:
ef->strsz = dp[i].d_un.d_val;
break;
case DT_SYMTAB:
ef->symtab = (Elf_Sym*)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_REL:
ef->rel = (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_RELSZ:
ef->relsz = dp[i].d_un.d_val;
break;
case DT_RELA:
ef->rela = (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_RELASZ:
ef->relasz = dp[i].d_un.d_val;
break;
default:
break;
}
}
if (ef->hashtab == NULL || ef->symtab == NULL ||
ef->strtab == NULL || ef->strsz == 0)
goto out;
COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
ef->buckets = ef->hashtab + 2;
ef->chains = ef->buckets + ef->nbuckets;
if (__elfN(parse_modmetadata)(fp, ef) == 0)
goto out;
if (ef->kernel) /* kernel must not depend on anything */
goto out;
out:
if (dp)
free(dp);
if (shdr)
free(shdr);
return ret;
}
