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Add testbench flag to propagate CPU return code to testbench return

This commit is contained in:
Luke Wren 2022-05-28 15:00:28 +01:00
parent 81aec325bb
commit 9e2f5df00a
1 changed files with 22 additions and 3 deletions
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25
test/sim/tb_cxxrtl/tb.cpp
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@ -238,7 +238,9 @@ bus_response mem_access(cxxrtl_design::p_tb &tb, mem_io_state &memio, bus_reques
// -----------------------------------------------------------------------------
const char *help_str =
"Usage: tb [--bin x.bin] [--vcd x.vcd] [--dump start end] [--cycles n] [--port n]\n"
"Usage: tb [--bin x.bin] [--port n] [--vcd x.vcd] [--dump start end] \\\n"
" [--cycles n] [--cpuret]\n"
"\n"
" --bin x.bin : Flat binary file loaded to address 0x0 in RAM\n"
" --vcd x.vcd : Path to dump waveforms to\n"
" --dump start end : Print out memory contents from start to end (exclusive)\n"
@ -247,6 +249,8 @@ const char *help_str =
" Default is 0 (no maximum).\n"
" --port n : Port number to listen for openocd remote bitbang. Sim\n"
" runs in lockstep with JTAG bitbang, not free-running.\n"
" --cpuret : Testbench's return code is the return code written to\n"
" IO_EXIT by the CPU, or -1 if timed out.\n"
;
void exit_help(std::string errtext = "") {
@ -264,6 +268,7 @@ int main(int argc, char **argv) {
std::string waves_path;
std::vector<std::pair<uint32_t, uint32_t>> dump_ranges;
int64_t max_cycles = 0;
bool propagate_return_code = false;
uint16_t port = 0;
for (int i = 1; i < argc; ++i) {
@ -307,6 +312,9 @@ int main(int argc, char **argv) {
port = std::stol(argv[i + 1], 0, 0);
i += 1;
}
else if (s == "--cpuret") {
propagate_return_code = true;
}
else {
std::cerr << "Unrecognised argument " << s << "\n";
exit_help("");
@ -414,6 +422,7 @@ int main(int argc, char **argv) {
top.step();
top.step(); // workaround for github.com/YosysHQ/yosys/issues/2780
bool timed_out = false;
for (int64_t cycle = 0; cycle < max_cycles || max_cycles == 0; ++cycle) {
top.p_clk.set<bool>(false);
top.step();
@ -566,8 +575,10 @@ int main(int argc, char **argv) {
printf("Ran for " I64_FMT " cycles\n", cycle + 1);
break;
}
if (cycle + 1 == max_cycles)
if (cycle + 1 == max_cycles) {
printf("Max cycles reached\n");
timed_out = true;
}
if (got_exit_cmd)
break;
}
@ -581,5 +592,13 @@ int main(int argc, char **argv) {
printf("\n");
}
return 0;
if (propagate_return_code && timed_out) {
return -1;
}
else if (propagate_return_code && memio.exit_req) {
return memio.exit_code;
}
else {
return 0;
}
}