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Provide a unit test for the longjmp() library function Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Acked-by: Sean Anderson <seanga2@gmail.com>
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Test setjmp(), longjmp()
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*
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* Copyright (c) 2021, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#include <common.h>
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#include <test/lib.h>
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#include <test/test.h>
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#include <test/ut.h>
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#include <asm/setjmp.h>
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struct test_jmp_buf {
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jmp_buf env;
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int val;
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};
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/**
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* test_longjmp() - test longjmp function
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*
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* @i is passed to longjmp.
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* @i << 8 is set in the environment structure.
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*
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* @env: environment
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* @i: value passed to longjmp()
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*/
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static noinline void test_longjmp(struct test_jmp_buf *env, int i)
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{
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env->val = i << 8;
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longjmp(env->env, i);
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}
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/**
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* test_setjmp() - test setjmp function
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*
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* setjmp() will return the value @i passed to longjmp() if @i is non-zero.
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* For @i == 0 we expect return value 1.
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*
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* @i << 8 will be set by test_longjmp in the environment structure.
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* This value can be used to check that the stack frame is restored.
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*
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* We return the XORed values to allow simply check both at once.
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*
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* @i: value passed to longjmp()
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* Return: values return by longjmp()
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*/
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static int test_setjmp(int i)
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{
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struct test_jmp_buf env;
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int ret;
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env.val = -1;
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ret = setjmp(env.env);
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if (ret)
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return ret ^ env.val;
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test_longjmp(&env, i);
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/* We should not arrive here */
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return 0x1000;
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}
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static int lib_test_longjmp(struct unit_test_state *uts)
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{
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int i;
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for (i = -3; i < 0; ++i)
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ut_asserteq(i ^ (i << 8), test_setjmp(i));
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ut_asserteq(1, test_setjmp(0));
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for (i = 1; i < 4; ++i)
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ut_asserteq(i ^ (i << 8), test_setjmp(i));
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return 0;
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}
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LIB_TEST(lib_test_longjmp, 0);
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