On Thu, Mar 25, 2021 at 03:31:50PM +0800, Heinrich Schuchardt wrote: > Provide a unit test for the longjmp() library function > > Signed-off-by: Heinrich Schuchardt <[email protected]> > ---- > v4: > use volatile for variable changed between setjmp and longjmp > v3: > check variable on stack > v2: > no change > --- > test/lib/Makefile | 1 + > test/lib/longjmp.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 78 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..bd1fe1aff6 > --- /dev/null > +++ b/test/lib/longjmp.c > @@ -0,0 +1,77 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Test setjmp(), longjmp() > + * > + * Copyright (c) 2021, Heinrich Schuchardt <[email protected]> > + */ > + > +#include <common.h> > +#include <test/lib.h> > +#include <test/test.h> > +#include <test/ut.h> > +#include <asm/setjmp.h> > + > +struct test_jmp_buf { > + jmp_buf env; > + /* > + * Auto-variables changed between setjmp() and longjmp() must be > + * static or volatile. Otherwise the result is undefined. > + */ > + volatile int val; > +}; > + > +/** > + * test_longjmp() - test longjmp function > + * > + * @i is passed to longjmp. > + * @i << 8 is set in the environment structure. > + * > + * @env: environment > + * @i: value passed to longjmp() > + */ > +static void noinline test_longjmp(struct test_jmp_buf *env, int i) > +{ > + env->val = i << 8; > + longjmp(env->env, i); > +} > + > +/** > + * test_setjmp() - test setjmp function > + * > + * setjmp() will return the value @i passed to longjmp() if @i is non-zero. > + * For @i == 0 we expect return value 1. > + * > + * @i << 8 will be set by test_longjmp in the environment structure. > + * This value can be used to check that the stack frame is restored. > + * > + * We return the XORed values to allow simply check both at once. > + * > + * @i: value passed to longjmp() > + * Return: values return by longjmp() > + */ > +static int test_setjmp(int i) > +{ > + struct test_jmp_buf env; > + int ret; > + > + env.val = -1; > + ret = setjmp(env.env); > + if (ret) > + return ret ^ env.val; > + test_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 ^ (i << 8) , test_setjmp(i)); > + ut_asserteq(1, test_setjmp(0)); > + for (i = 1; i < 4; ++i) > + ut_asserteq(i ^ (i << 8), test_setjmp(i)); > + return 0; > +} > +LIB_TEST(lib_test_longjmp, 0); > -- > 2.30.2 >
Reviewed-by: Leo Yu-Chi Liang <[email protected]>
