Looking at kernel/module.c:load_module():
>
> I was curious how I would find the start and end of a section in
> memory of ".data" section. From the code, I believe it is
To know that u can see how load_module() identify each section by name:
exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
gplfutureindex = find_sec(hdr, sechdrs, secstrings,
"__ksymtab_gpl_future");
unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
unusedgplindex = find_sec(hdr, sechdrs, secstrings,
"__ksymtab_unused_gpl");
> sechdr->sh_addr (start). How to reach the end(in memory) since the
What u said is correct. U can see how load_module() load each
section into memory (from file image) in the following extraction
(look at the memcp() statement - both the start of memory, and size is
indicated).
> field sechdr->sh_size is physical as per your explanation? (correct as
> well).
>
/* Transfer each section which specifies SHF_ALLOC */
DEBUGP("final section addresses:\n");
for (i = 0; i < hdr->e_shnum; i++) {
void *dest;
if (!(sechdrs[i].sh_flags & SHF_ALLOC))
continue;
if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
dest = mod->module_init
+ (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
else
dest = mod->module_core + sechdrs[i].sh_entsize;
if (sechdrs[i].sh_type != SHT_NOBITS)
memcpy(dest, (void *)sechdrs[i].sh_addr,
sechdrs[i].sh_size);==============>>>>this is the heart of section
loading.
/* Update sh_addr to point to copy in image. */
sechdrs[i].sh_addr = (unsigned long)dest;
DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings
+ sechdrs[i].sh_name);
}
>
> Regards,
> Asim
>
--
Regards,
Peter Teoh
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