kselftest/arm64: signal: Check SVE signal frame shows expected vector length

As a basic check that the SVE signal frame is being set up correctly
verify that the vector length in the signal frame is the vector length
that the process has.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210819134245.13935-4-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/tools/testing/selftests/arm64/signal/.gitignore b/tools/testing/selftests/arm64/signal/.gitignore
index 78c9020..c174275 100644 (file)
--- a/tools/testing/selftests/arm64/signal/.gitignore
+++ b/tools/testing/selftests/arm64/signal/.gitignore
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 mangle_*
 fake_sigreturn_*
+sve_*
 !*.[ch]

diff --git a/tools/testing/selftests/arm64/signal/testcases/sve_vl.c b/tools/testing/selftests/arm64/signal/testcases/sve_vl.c
new file mode 100644 (file)
index 0000000..9290465
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/sve_vl.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 ARM Limited
+ *
+ * Check that the SVE vector length reported in signal contexts is the
+ * expected one.
+ */
+
+#include <signal.h>
+#include <ucontext.h>
+#include <sys/prctl.h>
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+struct fake_sigframe sf;
+unsigned int vl;
+
+static bool get_sve_vl(struct tdescr *td)
+{
+       int ret = prctl(PR_SVE_GET_VL);
+       if (ret == -1)
+               return false;
+
+       vl = ret;
+
+       return true;
+}
+
+static int sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
+{
+       size_t resv_sz, offset;
+       struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);
+       struct sve_context *sve;
+
+       /* Get a signal context which should have a SVE frame in it */
+       if (!get_current_context(td, &sf.uc))
+               return 1;
+
+       resv_sz = GET_SF_RESV_SIZE(sf);
+       head = get_header(head, SVE_MAGIC, resv_sz, &offset);
+       if (!head) {
+               fprintf(stderr, "No SVE context\n");
+               return 1;
+       }
+       sve = (struct sve_context *)head;
+
+       if (sve->vl != vl) {
+               fprintf(stderr, "sigframe VL %u, expected %u\n",
+                       sve->vl, vl);
+               return 1;
+       } else {
+               fprintf(stderr, "got expected VL %u\n", vl);
+       }
+
+       td->pass = 1;
+
+       return 0;
+}
+
+struct tdescr tde = {
+       .name = "SVE VL",
+       .descr = "Check that we get the right SVE VL reported",
+       .feats_required = FEAT_SVE,
+       .timeout = 3,
+       .init = get_sve_vl,
+       .run = sve_vl,
+};