cmd: sandbox: implement exception command
Implement the commands
* exception undefined - execute an illegal instruction
* exception sigsegv - cause a segment violation
Here is a possible output:
=> exception undefined
Illegal instruction
pc = 0x55eb8d0a7575, pc_reloc = 0x57575
Resetting ...
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/sandbox/Makefile b/cmd/sandbox/Makefile
new file mode 100644
index 0000000..24df023
--- /dev/null
+++ b/cmd/sandbox/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-$(CONFIG_CMD_EXCEPTION) += exception.o
diff --git a/cmd/sandbox/exception.c b/cmd/sandbox/exception.c
new file mode 100644
index 0000000..1aa1d67
--- /dev/null
+++ b/cmd/sandbox/exception.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The 'exception' command can be used for testing exception handling.
+ *
+ * Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
+ */
+
+#include <common.h>
+#include <command.h>
+
+static int do_sigsegv(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ u8 *ptr = NULL;
+
+ *ptr = 0;
+ return CMD_RET_FAILURE;
+}
+
+static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ asm volatile (".word 0xffff\n");
+ return CMD_RET_FAILURE;
+}
+
+static struct cmd_tbl cmd_sub[] = {
+ U_BOOT_CMD_MKENT(sigsegv, CONFIG_SYS_MAXARGS, 1, do_sigsegv,
+ "", ""),
+ U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
+ "", ""),
+};
+
+static char exception_help_text[] =
+ "<ex>\n"
+ " The following exceptions are available:\n"
+ " undefined - undefined instruction\n"
+ " sigsegv - illegal memory access\n"
+ ;
+
+#include <exception.h>