[RFC PATCH bpf-next 08/13] selftests/bpf: Add unit tests for new sign-extension load insns

[Yonghong Song <yhs@fb.com>]

Signed-off-by: Yonghong Song <yhs@fb.com>
---
 .../selftests/bpf/prog_tests/verifier.c       |  2 +
 .../selftests/bpf/progs/verifier_lds.c        | 46 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/verifier_lds.c

diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index 070a13833c3f..bc05391174c7 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -31,6 +31,7 @@
 #include "verifier_int_ptr.skel.h"
 #include "verifier_jeq_infer_not_null.skel.h"
 #include "verifier_ld_ind.skel.h"
+#include "verifier_lds.skel.h"
 #include "verifier_leak_ptr.skel.h"
 #include "verifier_loops1.skel.h"
 #include "verifier_lwt.skel.h"
@@ -132,6 +133,7 @@ void test_verifier_helper_value_access(void)  { RUN(verifier_helper_value_access
 void test_verifier_int_ptr(void)              { RUN(verifier_int_ptr); }
 void test_verifier_jeq_infer_not_null(void)   { RUN(verifier_jeq_infer_not_null); }
 void test_verifier_ld_ind(void)               { RUN(verifier_ld_ind); }
+void test_verifier_lds(void)                  { RUN(verifier_lds); }
 void test_verifier_leak_ptr(void)             { RUN(verifier_leak_ptr); }
 void test_verifier_loops1(void)               { RUN(verifier_loops1); }
 void test_verifier_lwt(void)                  { RUN(verifier_lwt); }
diff --git a/tools/testing/selftests/bpf/progs/verifier_lds.c b/tools/testing/selftests/bpf/progs/verifier_lds.c
new file mode 100644
index 000000000000..85f3030e0cfd
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_lds.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("socket")
+__description("LDS, S8")
+__success __success_unpriv __retval(-2)
+__naked void lds_s8(void)
+{
+	asm volatile ("					\
+	r1 = 0x3fe;					\
+	*(u64 *)(r10 - 8) = r1;				\
+	r0 = *(s8 *)(r10 - 8);				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("LDS, S16")
+__success __success_unpriv __retval(-2)
+__naked void lds_s16(void)
+{
+	asm volatile ("					\
+	r1 = 0x3fffe;					\
+	*(u64 *)(r10 - 8) = r1;				\
+	r0 = *(s16 *)(r10 - 8);				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("LDS, S32")
+__success __success_unpriv __retval(-2)
+__naked void lds_s32(void)
+{
+	asm volatile ("					\
+	r1 = 0xfffffffe;				\
+	*(u64 *)(r10 - 8) = r1;				\
+	r0 = *(s32 *)(r10 - 8);				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";
-- 
2.34.1