[RFC PATCH bpf-next 09/13] selftests/bpf: Add unit tests for new sign-extension mov insns

[Yonghong Song <yhs@xxxxxx>]

Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
 .../selftests/bpf/prog_tests/verifier.c       |  2 +
 .../selftests/bpf/progs/verifier_movs.c       | 67 +++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/verifier_movs.c

diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index bc05391174c7..a4d9fc57aff2 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -41,6 +41,7 @@
 #include "verifier_map_ret_val.skel.h"
 #include "verifier_masking.skel.h"
 #include "verifier_meta_access.skel.h"
+#include "verifier_movs.skel.h"
 #include "verifier_netfilter_ctx.skel.h"
 #include "verifier_netfilter_retcode.skel.h"
 #include "verifier_prevent_map_lookup.skel.h"
@@ -143,6 +144,7 @@ void test_verifier_map_ptr_mixing(void)       { RUN(verifier_map_ptr_mixing); }
 void test_verifier_map_ret_val(void)          { RUN(verifier_map_ret_val); }
 void test_verifier_masking(void)              { RUN(verifier_masking); }
 void test_verifier_meta_access(void)          { RUN(verifier_meta_access); }
+void test_verifier_movs(void)                 { RUN(verifier_movs); }
 void test_verifier_netfilter_ctx(void)        { RUN(verifier_netfilter_ctx); }
 void test_verifier_netfilter_retcode(void)    { RUN(verifier_netfilter_retcode); }
 void test_verifier_prevent_map_lookup(void)   { RUN(verifier_prevent_map_lookup); }
diff --git a/tools/testing/selftests/bpf/progs/verifier_movs.c b/tools/testing/selftests/bpf/progs/verifier_movs.c
new file mode 100644
index 000000000000..575d2a708a01
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_movs.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("socket")
+__description("MOV32S, S8")
+__success __success_unpriv __retval(0x23)
+__naked void mov32s_s8(void)
+{
+	asm volatile ("					\
+	w0 = 0xff23;					\
+	w0 = (s8)w0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("MOV32S, S16")
+__success __success_unpriv __retval(0xFFFFff23)
+__naked void mov32s_s16(void)
+{
+	asm volatile ("					\
+	w0 = 0xff23;					\
+	w0 = (s16)w0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("MOV64S, S8")
+__success __success_unpriv __retval(-2)
+__naked void mov64s_s8(void)
+{
+	asm volatile ("					\
+	r0 = 0x1fe;					\
+	r0 = (s8)r0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("MOV64S, S16")
+__success __success_unpriv __retval(0xf23)
+__naked void mov64s_s16(void)
+{
+	asm volatile ("					\
+	r0 = 0xf0f23;					\
+	r0 = (s16)r0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("MOV64S, S32")
+__success __success_unpriv __retval(-2)
+__naked void mov64s_s32(void)
+{
+	asm volatile ("					\
+	r0 = 0xfffffffe;				\
+	r0 = (s32)r0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";
-- 
2.34.1