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add .parainstructions support 

Following in the same solution, regenerate [.rela].parainstructions
sections if table entries contain relocations that reference changed
functions (if any).

Fixes #135

Signed-off-by: Seth Jennings <sjenning@redhat.com>
This commit is contained in:
Seth Jennings 2014-04-25 15:57:30 -05:00
parent 8ed5aa06ea
commit 6ea92f1fc5
1 changed files with 67 additions and 0 deletions
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67
kpatch-build/create-diff-object.c
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@ -1105,6 +1105,72 @@ void kpatch_regenerate_smp_locks_sections(struct kpatch_elf *kelf)
sec->base->data->d_size = offset;
}
void kpatch_regenerate_parainstructions_sections(struct kpatch_elf *kelf)
{
struct section *sec;
struct table table;
struct rela *rela, *dstrela;
int i, nr = 0, offset = 0;
char *old, *new;
sec = find_section_by_name(&kelf->sections, ".rela.parainstructions");
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;
old = sec->base->data->d_buf;
/* alloc buffer for new text section */
new = malloc(sec->base->sh.sh_size);
if (!new)
ERROR("malloc");
for_each_rela(i, rela, &sec->relas) {
if (rela->sym->sec->status != SAME) {
log_debug("new/changed symbol %s found in parainstructions table\n",
rela->sym->name);
/* copy rela entry into new table */
*dstrela = *rela;
/* adjust offset in both table entry and rela section */
dstrela->offset = offset;
dstrela->rela.r_offset = offset;
/* copy the entry to the new text section */
memcpy(new + offset, old, 16);
offset += 16;
dstrela++;
nr++;
}
old += 16;
}
if (!nr) {
/* no changed functions referenced by parainstructions table */
sec->status = SAME;
sec->base->status = SAME;
return;
}
/* overwrite with new relas table */
table.nr = nr;
sec->relas = table;
/* mark sections for inclusion */
sec->include = 1;
sec->base->include = 1;
/* update rela section data size */
sec->data->d_size = sec->sh.sh_entsize * nr;
/* update text section data buf and size */
sec->base->data->d_buf = new;
sec->base->data->d_size = offset;
}
void kpatch_create_rela_section(struct section *sec, int link)
{
struct rela *rela;
@ -1460,6 +1526,7 @@ int main(int argc, char *argv[])
kpatch_replace_sections_syms(kelf_patched);
kpatch_regenerate_bug_table_rela_section(kelf_patched);
kpatch_regenerate_smp_locks_sections(kelf_patched);
kpatch_regenerate_parainstructions_sections(kelf_patched);
kpatch_include_standard_sections(kelf_patched);
if (!kpatch_include_changed_functions(kelf_patched)) {