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add debuginfo support

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This commit adds basic debuginfo support.  It is "basic" in as much as
it does not try to parse the DWARF data to figure out which parts
pertain to the changed code.  It simply includes all .debug_ and
.rela.debug_ section and strips out any rela entries that reference
unchanged symbols.  This corrupts the debuginfo for unchanged symbols
but since they are not going to be included anyway, there should be no
way to reference that information.

Signed-off-by: Seth Jennings <sjenning@redhat.com>
This commit is contained in:
Seth Jennings 2014-06-17 12:20:36 -05:00
parent cdd3486b20
commit 32b452aabe
2 changed files with 28 additions and 4 deletions
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28
kpatch-build/create-diff-object.c
View File

@ -1266,6 +1266,33 @@ void kpatch_regenerate_special_section(struct special_section *special,
sec->base->data->d_size = dest_offset;
}
void kpatch_include_debug_sections(struct kpatch_elf *kelf)
{
struct section *sec;
struct rela *rela, *saferela;
/* include all .debug_* sections */
list_for_each_entry(sec, &kelf->sections, list) {
if (!strncmp(sec->name, ".debug_", 7)) {
sec->include = 1;
if (sec->rela)
sec->rela->include = 1;
sec->secsym->include = 1;
}
}
/*
* Go through the .rela.debug_ sections and strip entries
* referencing unchanged symbols
*/
list_for_each_entry(sec, &kelf->sections, list) {
if (strncmp(sec->name, ".rela.debug_", 12))
continue;
list_for_each_entry_safe(rela, saferela, &sec->relas, list)
if (!rela->sym->sec->include)
list_del(&rela->list);
}
}
void kpatch_process_special_sections(struct kpatch_elf *kelf)
{
@ -2098,6 +2125,7 @@ int main(int argc, char *argv[])
kpatch_include_standard_elements(kelf_patched);
num_changed = kpatch_include_changed_functions(kelf_patched);
kpatch_include_debug_sections(kelf_patched);
kpatch_dump_kelf(kelf_patched);
kpatch_verify_patchability(kelf_patched);

4
kpatch-build/kpatch-build
View File

@ -43,7 +43,6 @@ ARCHVERSION="$(uname -r)"
CPUS="$(grep -c ^processor /proc/cpuinfo)"
CACHEDIR="$HOME/.kpatch"
TEMPDIR=
STRIPCMD="strip -d --keep-file-symbols"
APPLIEDPATCHFILE="applied-patch"
DEBUG=0
@ -356,7 +355,6 @@ cp "$OBJDIR/.config" "$OBJDIR2" || die
mkdir "$TEMPDIR/patched"
for i in $(cat $TEMPDIR/changed_objs); do
KCFLAGS="-ffunction-sections -fdata-sections" make "$i" "O=$OBJDIR2" >> "$LOGFILE" 2>&1 || die
$STRIPCMD "$OBJDIR2/$i" >> "$LOGFILE" 2>&1 || die
mkdir -p "$TEMPDIR/patched/$(dirname $i)"
cp -f "$OBJDIR2/$i" "$TEMPDIR/patched/$i" || die
done
@ -366,7 +364,6 @@ mkdir "$TEMPDIR/orig"
for i in $(cat $TEMPDIR/changed_objs); do
rm -f "$i"
KCFLAGS="-ffunction-sections -fdata-sections" make "$i" "O=$OBJDIR2" >> "$LOGFILE" 2>&1 || die
$STRIPCMD -d "$OBJDIR2/$i" >> "$LOGFILE" 2>&1 || die
mkdir -p "$TEMPDIR/orig/$(dirname $i)"
cp -f "$OBJDIR2/$i" "$TEMPDIR/orig/$i" || die
done
@ -404,7 +401,6 @@ cd "$TEMPDIR/output"
ld -r -o ../patch/output.o $FILES >> "$LOGFILE" 2>&1 || die
cd "$TEMPDIR/patch"
KPATCH_BUILD="$SRCDIR" KPATCH_NAME="$PATCHNAME" KBUILD_EXTRA_SYMBOLS="$SYMVERSFILE" make "O=$OBJDIR" >> "$LOGFILE" 2>&1 || die
$STRIPCMD "kpatch-$PATCHNAME.ko" >> "$LOGFILE" 2>&1 || die
cp -f "$TEMPDIR/patch/kpatch-$PATCHNAME.ko" "$BASE" || die