dtc: Add valgrind support to testsuite

This patch adds some options to the run_tests.sh script allowing it to
run all the testcases under valgrind to check for pointer corruption
bugs and memory leaks.  Invoking "make checkm" will run the testsuite
with valgrind.

It include a mechanism for specifying valgrind errors to be suppressed
on a per-testcase basis, and adds a couple of such suppression files
for the mangle-layout and open_pack testcases which dump for use by
other testcases a buffer which may contain uninitialized sections.  We
use suppressions rather than initializing the buffer so that valgrind
will catch any internal access s to the uninitialized data, which
would be a bug.

The patch also fixes one genuine bug caught by valgrind -
_packblocks() in fdt_rw.c was using memcpy() where it should have been
using memmove().

At present the valgrinding won't do anything useful for testcases
invoked via a shell script - which includes all the dtc testcases.  I
plan to fix that later.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/open_pack.supp b/tests/open_pack.supp
new file mode 100644
index 0000000..a38abc5
--- /dev/null
+++ b/tests/open_pack.supp
@@ -0,0 +1,7 @@
+{
+   opened blob dumps uninitialized data
+   Memcheck:Param
+   write(buf)
+   obj:/lib/ld-2.6.1.so
+   fun:main
+}