1 files changed, 81 insertions, 0 deletions
diff --git a/cmd/riscv/exception.c b/cmd/riscv/exception.c
new file mode 100644
index 00000000000..14ad6c440a5
--- /dev/null
+++ b/cmd/riscv/exception.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The 'exception' command can be used for testing exception handling.
+ *
+ * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
+ */
+
+#include <command.h>
+
+static int do_compressed(struct cmd_tbl *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	/* c.li a0, 0; c.li a0, 0 */
+	asm volatile (".long 0x45014501\n");
+	printf("The system supports compressed instructions.\n");
+	return CMD_RET_SUCCESS;
+}
+
+static int do_ebreak(struct cmd_tbl *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	asm volatile ("ebreak\n");
+	return CMD_RET_FAILURE;
+}
+
+static int do_ialign16(struct cmd_tbl *cmdtp, int flag, int argc,
+		       char *const argv[])
+{
+	asm volatile (
+		/* jump skipping 2 bytes */
+		".long 0x0060006f\n"
+		".long 0x006f0000\n"
+		".long 0x00000060\n"
+	);
+	printf("The system supports 16 bit aligned instructions.\n");
+	return CMD_RET_SUCCESS;
+}
+
+static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	asm volatile (
+		"auipc a1, 0\n"
+		"ori   a1, a1, 3\n"
+		"lw    a2, (0)(a1)\n"
+	);
+	printf("The system supports unaligned access.\n");
+	return CMD_RET_SUCCESS;
+}
+
+static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	asm volatile (".word 0xffffffff\n");
+	return CMD_RET_FAILURE;
+}
+
+static struct cmd_tbl cmd_sub[] = {
+	U_BOOT_CMD_MKENT(compressed, CONFIG_SYS_MAXARGS, 1, do_compressed,
+			 "", ""),
+	U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak,
+			 "", ""),
+	U_BOOT_CMD_MKENT(ialign16, CONFIG_SYS_MAXARGS, 1, do_ialign16,
+			 "", ""),
+	U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
+			 "", ""),
+	U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
+			 "", ""),
+};
+
+static char exception_help_text[] =
+	"<ex>\n"
+	"  The following exceptions are available:\n"
+	"  compressed - compressed instruction\n"
+	"  ebreak     - breakpoint\n"
+	"  ialign16   - 16 bit aligned instruction\n"
+	"  undefined  - illegal instruction\n"
+	"  unaligned  - load address misaligned\n"
+	;
+
+#include <exception.h>