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Merge pull request #158 from jpoimboe/cdo-jump-table 

create-diff-object: support for __jump_table
This commit is contained in:
Seth Jennings 2014-04-30 11:00:58 -05:00
parent 065619ec68 5852ddb6a2
commit 2f9f2e1ee2
1 changed files with 53 additions and 0 deletions
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53
kpatch-build/create-diff-object.c
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@ -1174,6 +1174,58 @@ void kpatch_regenerate_parainstructions_sections(struct kpatch_elf *kelf)
sec->base->data->d_size = offset;
}
void kpatch_regenerate_jump_table_sections(struct kpatch_elf *kelf)
{
struct section *sec;
struct table table;
struct rela *rela, *dstrela;
int i, nr = 0, offset = 0;
sec = find_section_by_name(&kelf->sections, ".rela__jump_table");
if (!sec)
return;
/* alloc buffer of original size (probably won't use it all) */
alloc_table(&table, sizeof(struct rela), sec->relas.nr);
dstrela = table.data;
for_each_rela(i, rela, &sec->relas) {
if (rela->sym->sec->status != SAME) {
log_debug("new/changed symbol %s found in jump table\n",
rela->sym->name);
*dstrela = *rela;
dstrela->offset = offset;
dstrela->rela.r_offset = offset;
dstrela++;
offset += 8;
nr++;
}
}
if (!nr) {
/* no changed functions referenced by jump table */
sec->status = SAME;
sec->base->status = SAME;
return;
}
/* overwrite with new relas table */
table.nr = nr;
sec->relas = table;
sec->include = 1;
sec->base->include = 1;
/*
* Adjust d_size but not d_buf. d_buf is overwritten in
* kpatch_create_rela_section() from the relas table. No
* point in regen'ing the buffer here just to be discarded
* later.
*/
sec->data->d_size = sec->sh.sh_entsize * nr;
/* truncate __jump_table section */
sec->base->data->d_size = offset;
}
void kpatch_create_rela_section(struct section *sec, int link)
{
struct rela *rela;
@ -1531,6 +1583,7 @@ int main(int argc, char *argv[])
kpatch_regenerate_bug_table_rela_section(kelf_patched);
kpatch_regenerate_smp_locks_sections(kelf_patched);
kpatch_regenerate_parainstructions_sections(kelf_patched);
kpatch_regenerate_jump_table_sections(kelf_patched);
kpatch_include_standard_sections(kelf_patched);
num_changed = kpatch_include_changed_functions(kelf_patched);