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[sw/cpu_test] refined illegal_instruction test (now also testing mtval value)

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stnolting 2020-10-15 19:16:35 +02:00
parent f4239a7858
commit 908f5d55a3
1 changed files with 11 additions and 9 deletions
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20
sw/example/cpu_test/main.c
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@ -485,20 +485,22 @@ int main() {
// ----------------------------------------------------------
exception_handler_answer = 0xFFFFFFFF;
neorv32_uart_printf("EXC I_ILLEG: ");
cnt_test++;
// create test program in RAM
static const uint32_t dummy_sub_program[2] __attribute__((aligned(8))) = {
0xDEAD007F, // undefined 32-bit instruction (invalid opcode) -> illegal instruction exception
0x00008067 // ret (32-bit)
};
tmp_a = (uint32_t)&dummy_sub_program; // call the dummy sub program
asm volatile ("jalr ra, %[input_i]" : : [input_i] "r" (tmp_a));
asm volatile ("csrrw zero, 0xfff, zero"); // = 0xfff01073 : CSR 0xfff not implemented -> illegal instruction
#if (DETAILED_EXCEPTION_DEBUG==0)
// make sure this has cause an illegal exception
if (exception_handler_answer == TRAP_CODE_I_ILLEGAL) {
test_ok();
// make sure this is really the instruction that caused the exception
// for illegal instructions mtval contains the actual instruction word
if (neorv32_cpu_csr_read(CSR_MTVAL) == 0xfff01073) {
test_ok();
}
else {
test_fail();
}
}
else {
test_fail();