[PATCH 2/2] sandbox: add cpuinfo command

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

We have stack dump support in sandbox via AddressSanitizer, if it's
compiled in. To make it easier to test proper operation, let's a cpuinfo
command like we already do on ARM and give it the same -s option.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 arch/sandbox/Kconfig         |  7 +++++++
 arch/sandbox/board/Makefile  |  1 +
 arch/sandbox/board/cpuinfo.c | 40 ++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 arch/sandbox/board/cpuinfo.c

diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index 52915490ca98..caff3a138fea 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -58,6 +58,13 @@ config SANDBOX_REEXEC
 	  The normal reset handler hangs barebox. On Linux, barebox
 	  instead can exec itself to simulate a reset.
 
+config CMD_SANDBOX_CPUINFO
+	bool "cpuinfo command"
+	depends on COMMAND_SUPPORT
+	default y
+	help
+	  Say yes here to get a dummy cpuinfo command.
+
 config SDL
 	bool
 
diff --git a/arch/sandbox/board/Makefile b/arch/sandbox/board/Makefile
index 8e6e1d2d8843..029bfe7ff163 100644
--- a/arch/sandbox/board/Makefile
+++ b/arch/sandbox/board/Makefile
@@ -10,6 +10,7 @@ obj-y += dtb.o
 obj-y += power.o
 obj-y += dev-random.o
 obj-y += watchdog.o
+obj-$(CONFIG_CMD_SANDBOX_CPUINFO) += cpuinfo.o
 obj-$(CONFIG_LED) += led.o
 
 extra-y += barebox.lds
diff --git a/arch/sandbox/board/cpuinfo.c b/arch/sandbox/board/cpuinfo.c
new file mode 100644
index 000000000000..ce2762e607fd
--- /dev/null
+++ b/arch/sandbox/board/cpuinfo.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <getopt.h>
+#include <command.h>
+#include <complete.h>
+
+static int do_cpuinfo(int argc, char *argv[])
+{
+	int opt;
+
+	while ((opt = getopt(argc, argv, "s")) > 0) {
+		switch (opt) {
+		case 's':
+			if (!IS_ENABLED(CONFIG_ARCH_HAS_STACK_DUMP))
+				return -ENOSYS;
+
+			dump_stack();
+			return 0;
+		default:
+			return COMMAND_ERROR_USAGE;
+		}
+	}
+
+	return 0;
+}
+
+BAREBOX_CMD_HELP_START(cpuinfo)
+BAREBOX_CMD_HELP_TEXT("Shows misc info about CPU")
+BAREBOX_CMD_HELP_OPT ("-s", "print call stack info (if supported)")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(cpuinfo)
+	.cmd            = do_cpuinfo,
+	BAREBOX_CMD_DESC("show info about CPU")
+	BAREBOX_CMD_OPTS("[-s]")
+	BAREBOX_CMD_GROUP(CMD_GRP_INFO)
+	BAREBOX_CMD_COMPLETE(empty_complete)
+	BAREBOX_CMD_HELP(cmd_cpuinfo_help)
+BAREBOX_CMD_END
-- 
2.39.5