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Correctly implement LMA calculation.

This commit is contained in:
Mario Hüttel 2023-01-06 16:06:51 +01:00
parent 0df385e4e7
commit 376ef75964
1 changed files with 28 additions and 1 deletions
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29
src/elfpatch.c
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@ -272,7 +272,8 @@ static int elf_patch_read_program_headers(elfpatch_handle_t *ep)
print_err("Error reading program header (%zu): %s\n", i, elf_errmsg(-1));
goto ret_free_err;
}
print_debug("Program Header (i): mem_size: %zu, file_size: %zu, vma: %p, lma: %p, file offset: %zu\n",
print_debug("Program Header (%zu): mem_size: %zu, file_size: %zu, vma: %p, lma: %p, file offset: %zu\n",
i,
(size_t)hdr->p_memsz, (size_t)hdr->p_filesz, (void *)hdr->p_vaddr, (void *)hdr->p_paddr,
hdr->p_offset);
}
@ -291,11 +292,37 @@ ret_free_err:
static void resolve_section_lmas(elfpatch_handle_t *ep)
{
SlList *sec_iter;
struct elf_section *sec;
size_t idx;
uint64_t sec_file_offset;
uint64_t section_offset_in_segment;
const GElf_Phdr *phdr;
ret_if_ep_err(ep);
for (sec_iter = ep->sections; sec_iter; sec_iter = sl_list_next(sec_iter)) {
sec = (struct elf_section *)sec_iter->data;
if (!sec)
continue;
if (sec->section_header.sh_type == SHT_NOBITS) {
/* Section does not contain data. It may be allocated but is not loaded. Therefore, LMA=VMA. */
sec->lma = (uint64_t)sec->section_header.sh_addr;
continue;
}
sec_file_offset = (uint64_t) sec->section_header.sh_offset;
/* Check in which segment the file offset is located */
for (idx = 0; idx < ep->program_headers_count; idx++) {
phdr = &ep->program_headers[idx];
if (sec_file_offset >= phdr->p_offset && sec_file_offset < (phdr->p_offset + phdr->p_filesz)) {
/* Section lies within this segment */
section_offset_in_segment = sec_file_offset - phdr->p_offset;
sec->lma = ((uint64_t)phdr->p_paddr) + section_offset_in_segment;
break;
}
}
}
}