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// 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>
struct test_jmp_buf {
jmp_buf env;
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 noinline void 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);
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