efi_selftest: test handling of exceptions

Test the handling of execptions by trying to execute an undefined
instruction. For 32bit ARM we expect \selftest to be listed as loaded
image.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 0acd790550eb463408a452a708d742c318ab045c..4b1c0bb84b18f69a5c10d8e84c540c0be263c4e7 100644 (file)
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -21,6 +21,7 @@ efi_selftest_devicepath.o \
 efi_selftest_devicepath_util.o \
 efi_selftest_events.o \
 efi_selftest_event_groups.o \
+efi_selftest_exception.o \
 efi_selftest_exitbootservices.o \
 efi_selftest_fdt.o \
 efi_selftest_gop.o \

diff --git a/lib/efi_selftest/efi_selftest_exception.c b/lib/efi_selftest/efi_selftest_exception.c
new file mode 100644 (file)
index 0000000..2ac1796
--- /dev/null
+++ b/lib/efi_selftest/efi_selftest_exception.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * efi_selftest_exception
+ *
+ * Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
+ *
+ * Test the handling of execptions by trying to execute an undefined
+ * instruction.
+ */
+
+#include <efi_selftest.h>
+
+/**
+ * undefined_instruction() - try to executed an undefined instruction
+ */
+static void undefined_instruction(void)
+{
+#if defined(CONFIG_ARM)
+       /*
+        * 0xe7f...f.   is undefined in ARM mode
+        * 0xde..       is undefined in Thumb mode
+        */
+       asm volatile (".word 0xe7f7defb\n");
+#elif defined(CONFIG_RISCV)
+       asm volatile (".word 0xffffffff\n");
+#elif defined(CONFIG_X86)
+       asm volatile (".word 0xffff\n");
+#endif
+}
+
+/**
+ * execute() - execute unit test
+ *
+ * Return:     EFI_ST_SUCCESS for success
+ */
+static int execute(void)
+{
+       undefined_instruction();
+
+       efi_st_error("An undefined instruction exeption was not raised\n");
+
+       return EFI_ST_FAILURE;
+}
+
+EFI_UNIT_TEST(exception) = {
+       .name = "exception",
+       .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
+       .execute = execute,
+       .on_request = true,
+};