[PATCH v2 2/2] test: unit test for longjmp

[Sean Anderson <seanga2@gmail.com>]

On 3/22/21 7:02 AM, Heinrich Schuchardt wrote:
> Provide a unit test for the longjmp() library function
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> ---
> v2:
> 	no change
> ---
>   test/lib/Makefile  |  1 +
>   test/lib/longjmp.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 45 insertions(+)
>   create mode 100644 test/lib/longjmp.c
> 
> diff --git a/test/lib/Makefile b/test/lib/Makefile
> index 97c11e35a8..a30f615aa9 100644
> --- a/test/lib/Makefile
> +++ b/test/lib/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_EFI_LOADER) += efi_device_path.o
>   obj-$(CONFIG_EFI_SECURE_BOOT) += efi_image_region.o
>   obj-y += hexdump.o
>   obj-y += lmb.o
> +obj-y += longjmp.o
>   obj-$(CONFIG_CONSOLE_RECORD) += test_print.o
>   obj-$(CONFIG_SSCANF) += sscanf.o
>   obj-y += string.o
> diff --git a/test/lib/longjmp.c b/test/lib/longjmp.c
> new file mode 100644
> index 0000000000..7571540ffc
> --- /dev/null
> +++ b/test/lib/longjmp.c
> @@ -0,0 +1,44 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Test setjmp(), longjmp()
> + *
> + * Copyright (c) 2021, Heinrich Schuchardt <xypron.glpk@gmx.de>
> + */
> +
> +#include <common.h>
> +#include <test/lib.h>
> +#include <test/test.h>
> +#include <test/ut.h>
> +#include <asm/setjmp.h>
> +
> +/**
> + * test_longjmp_ret() - get longjmp() return value
> + *
> + * @i:		value passed to longjmp()
> + * Return:	value returned by longjmp()
> + */
> +int test_longjmp_ret(int i)
> +{
> +	jmp_buf env;
> +	int ret;
> +
> +	ret = setjmp(env);
> +	if (ret)
> +		return ret;
> +	longjmp(env, i);
> +	/* We should not arrive here */
> +	return 0x1000;
> +}
> +
> +static int lib_test_longjmp(struct unit_test_state *uts)
> +{
> +	int i;
> +
> +	for (i = -3; i < 0; ++i)
> +		ut_asserteq(i, test_longjmp_ret(i));
> +	ut_asserteq(1, test_longjmp_ret(0));
> +	for (i = 1; i < 4; ++i)
> +		ut_asserteq(i, test_longjmp_ret(i));
> +	return 0;
> +}
> +LIB_TEST(lib_test_longjmp, 0);
> --
> 2.30.2
> 

Reviewed-by: Sean Anderson <seanga2@gmail.com>
Tested-by: Sean Anderson <seanga2@gmail.com>

Though I would like to test that variables are set correctly e.g. by doing

int test_longjmp_ret(int i)
{
	jmp_buf env;
	int ret;

	ret = setjmp(env);
	if (ret)
		return ret;
	ret = 0x1000;
	longjmp(env, i);
	/* We should not arrive here */
	return ret;
}

--Sean