int parse_elf_to_payload(const struct buffer *input, struct buffer *output,
enum comp_algo algo)
{
Elf64_Phdr *phdr;
Elf64_Ehdr ehdr;
Elf64_Shdr *shdr;
char *header;
char *strtab;
int headers;
int segments = 1;
int isize = 0, osize = 0;
int doffset = 0;
struct cbfs_payload_segment *segs = NULL;
int i;
int ret = 0;
comp_func_ptr compress = compression_function(algo);
if (!compress)
return -1;
if (elf_headers(input, &ehdr, &phdr, &shdr) < 0)
return -1;
DEBUG("start: parse_elf_to_payload\n");
headers = ehdr.e_phnum;
header = input->data;
strtab = &header[shdr[ehdr.e_shstrndx].sh_offset];
/* Count the number of headers - look for the .notes.pinfo
* section */
for (i = 0; i < ehdr.e_shnum; i++) {
char *name;
if (i == ehdr.e_shstrndx)
continue;
if (shdr[i].sh_size == 0)
continue;
name = (char *)(strtab + shdr[i].sh_name);
if (!strcmp(name, ".note.pinfo")) {
segments++;
isize += (unsigned int)shdr[i].sh_size;
}
}
/* Now, regular headers - we only care about PT_LOAD headers,
* because thats what we're actually going to load
*/
for (i = 0; i < headers; i++) {
if (phdr[i].p_type != PT_LOAD)
continue;
/* Empty segments are never interesting */
if (phdr[i].p_memsz == 0)
continue;
isize += phdr[i].p_filesz;
segments++;
}
/* allocate the segment header array */
segs = calloc(segments, sizeof(*segs));
if (segs == NULL) {
ret = -1;
goto out;
}
/* Allocate a block of memory to store the data in */
if (buffer_create(output, (segments * sizeof(*segs)) + isize,
input->name) != 0) {
ret = -1;
goto out;
}
memset(output->data, 0, output->size);
doffset = (segments * sizeof(*segs));
/* set up for output marshaling. This is a bit
* tricky as we are marshaling the headers at the front,
* and the data starting after the headers. We need to convert
* the headers to the right format but the data
* passes through unchanged. Unlike most XDR code,
* we are doing these two concurrently. The doffset is
* used to compute the address for the raw data, and the
* outheader is used to marshal the headers. To make it simpler
* for The Reader, we set up the headers in a separate array,
* then marshal them all at once to the output.
*/
segments = 0;
for (i = 0; i < ehdr.e_shnum; i++) {
char *name;
if (i == ehdr.e_shstrndx)
continue;
if (shdr[i].sh_size == 0)
continue;
name = (char *)(strtab + shdr[i].sh_name);
if (!strcmp(name, ".note.pinfo")) {
segs[segments].type = PAYLOAD_SEGMENT_PARAMS;
segs[segments].load_addr = 0;
segs[segments].len = (unsigned int)shdr[i].sh_size;
segs[segments].offset = doffset;
memcpy((unsigned long *)(output->data + doffset),
&header[shdr[i].sh_offset], shdr[i].sh_size);
doffset += segs[segments].len;
osize += segs[segments].len;
segments++;
}
}
for (i = 0; i < headers; i++) {
if (phdr[i].p_type != PT_LOAD)
continue;
if (phdr[i].p_memsz == 0)
continue;
if (phdr[i].p_filesz == 0) {
segs[segments].type = PAYLOAD_SEGMENT_BSS;
segs[segments].load_addr = phdr[i].p_paddr;
segs[segments].mem_len = phdr[i].p_memsz;
segs[segments].offset = doffset;
segments++;
continue;
}
if (phdr[i].p_flags & PF_X)
segs[segments].type = PAYLOAD_SEGMENT_CODE;
else
segs[segments].type = PAYLOAD_SEGMENT_DATA;
segs[segments].load_addr = phdr[i].p_paddr;
segs[segments].mem_len = phdr[i].p_memsz;
segs[segments].offset = doffset;
/* If the compression failed or made the section is larger,
use the original stuff */
int len;
if (compress((char *)&header[phdr[i].p_offset],
phdr[i].p_filesz, output->data + doffset, &len) ||
(unsigned int)len > phdr[i].p_filesz) {
WARN("Compression failed or would make the data bigger "
"- disabled.\n");
segs[segments].compression = 0;
segs[segments].len = phdr[i].p_filesz;
memcpy(output->data + doffset,
&header[phdr[i].p_offset], phdr[i].p_filesz);
} else {
segs[segments].compression = algo;
segs[segments].len = len;
}
doffset += segs[segments].len;
osize += segs[segments].len;
segments++;
}
segs[segments].type = PAYLOAD_SEGMENT_ENTRY;
segs[segments++].load_addr = ehdr.e_entry;
output->size = (segments * sizeof(*segs)) + osize;
xdr_segs(output, segs, segments);
out:
if (segs) free(segs);
if (shdr) free(shdr);
if (phdr) free(phdr);
return ret;
}
/* returns size of result, or -1 if error.
* Note that, with the new code, this function
* works for all elf files, not just the restricted set.
*/
int parse_elf_to_stage(const struct buffer *input, struct buffer *output,
uint32_t arch, comp_algo algo, uint32_t *location)
{
Elf64_Phdr *phdr;
Elf64_Ehdr ehdr;
char *buffer;
struct buffer outheader;
int headers;
int i, outlen;
uint32_t data_start, data_end, mem_end;
comp_func_ptr compress = compression_function(algo);
if (!compress)
return -1;
DEBUG("start: parse_elf_to_stage(location=0x%x)\n", *location);
if (elf_headers(input, arch, &ehdr, &phdr, NULL) < 0)
return -1;
headers = ehdr.e_phnum;
data_start = ~0;
data_end = 0;
mem_end = 0;
for (i = 0; i < headers; i++) {
unsigned int start, mend, rend;
if (phdr[i].p_type != PT_LOAD)
continue;
/* Empty segments are never interesting */
if (phdr[i].p_memsz == 0)
continue;
/* BSS */
start = phdr[i].p_paddr;
mend = start + phdr[i].p_memsz;
rend = start + phdr[i].p_filesz;
if (start < data_start)
data_start = start;
if (rend > data_end)
data_end = rend;
if (mend > mem_end)
mem_end = mend;
}
if (data_start < *location) {
data_start = *location;
}
if (data_end <= data_start) {
ERROR("data ends (%08lx) before it starts (%08lx). Make sure "
"the ELF file is correct and resides in ROM space.\n",
(unsigned long)data_end, (unsigned long)data_start);
exit(1);
}
/* allocate an intermediate buffer for the data */
buffer = calloc(data_end - data_start, 1);
if (buffer == NULL) {
ERROR("Unable to allocate memory: %m\n");
return -1;
}
/* Copy the file data into the buffer */
for (i = 0; i < headers; i++) {
unsigned int l_start, l_offset = 0;
if (phdr[i].p_type != PT_LOAD)
continue;
if (phdr[i].p_memsz == 0)
continue;
l_start = phdr[i].p_paddr;
if (l_start < *location) {
l_offset = *location - l_start;
l_start = *location;
}
/* A legal ELF file can have a program header with
* non-zero length but zero-length file size and a
* non-zero offset which, added together, are > than
* input->size (i.e. the total file size). So we need
* to not even test in the case that p_filesz is zero.
*/
if (! phdr[i].p_filesz)
continue;
if (input->size < (phdr[i].p_offset + phdr[i].p_filesz)){
ERROR("Underflow copying out the segment."
"File has %zu bytes left, segment end is %zu\n",
input->size, (size_t)(phdr[i].p_offset + phdr[i].p_filesz));
free(buffer);
return -1;
}
memcpy(buffer + (l_start - data_start),
&input->data[phdr[i].p_offset + l_offset],
phdr[i].p_filesz - l_offset);
}
/* Now make the output buffer */
if (buffer_create(output, sizeof(struct cbfs_stage) + data_end - data_start,
input->name) != 0) {
ERROR("Unable to allocate memory: %m\n");
free(buffer);
return -1;
}
memset(output->data, 0, output->size);
/* Compress the data, at which point we'll know information
* to fill out the header. This seems backward but it works because
* - the output header is a known size (not always true in many xdr's)
* - we do need to know the compressed output size first
* If compression fails or makes the data bigger, we'll warn about it
* and use the original data.
*/
if (compress(buffer, data_end - data_start,
(output->data + sizeof(struct cbfs_stage)),
&outlen) < 0 || outlen > data_end - data_start) {
WARN("Compression failed or would make the data bigger "
"- disabled.\n");
memcpy(output->data + sizeof(struct cbfs_stage),
buffer, data_end - data_start);
algo = CBFS_COMPRESS_NONE;
}
free(buffer);
/* Set up for output marshaling. */
outheader.data = output->data;
outheader.size = 0;
/* N.B. The original plan was that SELF data was B.E.
* but: this is all L.E.
* Maybe we should just change the spec.
*/
xdr_le.put32(&outheader, algo);
xdr_le.put64(&outheader, ehdr.e_entry);
xdr_le.put64(&outheader, data_start);
xdr_le.put32(&outheader, outlen);
xdr_le.put32(&outheader, mem_end - data_start);
if (*location)
*location -= sizeof(struct cbfs_stage);
output->size = sizeof(struct cbfs_stage) + outlen;
return 0;
}
