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17 lines
540 B
17 lines
540 B
/*
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* Below is the given application for lab1_challenge2 (same as lab1_2).
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* This app attempts to issue M-mode instruction in U-mode, and consequently raises an exception.
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*/
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#include "user_lib.h"
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#include "util/types.h"
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int main(void) {
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printu("Going to hack the system by running privilege instructions.\n");
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// we are now in U(user)-mode, but the "csrw" instruction requires M-mode privilege.
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// Attempting to execute such instruction will raise illegal instruction exception.
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asm volatile("csrw sscratch, 0");
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exit(0);
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}
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