[emulator] write MMIO store to file

Signed-off-by: Avimitin <[email protected]>

.gitignore

@@ -21,3 +21,4 @@ __pycache__
 .envrc
 test-results
 target
+.ccls-cache

ipemu/csrc/dpi.cc

@@ -15,6 +15,7 @@
 static bool terminated = false;
 
 void sigint_handler(int s) {
+  ProgramOutputStoreFile.close();
   terminated = true;
   dpi_finish();
 }
@@ -29,12 +30,14 @@ void sigint_handler(int s) {
     Log("SimulationExit")                                                      \
         .info("detect returning instruction, gracefully quit simulation");     \
     vbridge_impl_instance.on_exit();                                                      \
+    ProgramOutputStoreFile.close(); \
     dpi_finish();                                                              \
   } catch (std::runtime_error & e) {                                           \
     terminated = true;                                                         \
     svSetScope(                                                                \
         svGetScopeFromName("TOP.TestBench.dpiError"));                         \
     dpi_error(fmt::format("runtime_error occurs: {}", e.what()).c_str());      \
+    ProgramOutputStoreFile.close(); \
   }
 
 #if VM_TRACE

ipemu/csrc/simple_sim.h

@@ -1,13 +1,20 @@
 #pragma once
 
 #include <fstream>
+#include <iostream>
 
 #include <fmt/core.h>
 
 #include "simif.h"
 #include "spdlog_ext.h"
 #include "uartlite.h"
 
+// File that contains program stdout/stderr from MMIO
+// Initialize in vbridge_impl.cc, closed in dpi.cc
+//
+// Require C++ 17 here to have inline keyword feature, so that the compiler can collapse all symbol into one declaration and bypass mold error.
+inline std::ofstream ProgramOutputStoreFile;
+
 class simple_sim : public simif_t {
 private:
   char *mem;
@@ -56,8 +63,8 @@ class simple_sim : public simif_t {
     if (uart_addr <= addr && addr < uart_addr + sizeof(uartlite_regs)) {
       bool res = uart.do_write(addr - uart_addr, len, bytes);
       while (uart.exist_tx()) {
-        std::cerr << uart.getc();
-        std::cerr.flush();
+        ProgramOutputStoreFile << uart.getc();
+        ProgramOutputStoreFile.flush();
       }
       return res;
     }

ipemu/csrc/vbridge_impl.cc

@@ -218,6 +218,8 @@ static VBridgeImpl vbridgeImplFromArgs() {
   args::Flag no_console_logging(parser, "no_console_logging", "Disable console logging utilities.", { "no-console-logging" });
   args::ValueFlag<std::string> log_path(parser, "log path", "Path to store logging file", {"log-path"});
 
+  args::ValueFlag<std::string> program_output_path(parser, "program output path", "Path to store stdout/stderr produce by program", {"program-output-path"});
+
   args::ValueFlag<size_t> vlen(parser, "vlen", "match from RTL config, tobe removed", {"vlen"}, args::Options::Required);
   args::ValueFlag<size_t> dlen(parser, "dlen", "match from RTL config, tobe removed", {"dlen"}, args::Options::Required);
   args::ValueFlag<size_t> tl_bank_number(parser, "tl_bank_number", "match from RTL config, tobe removed", {"tl_bank_number"}, args::Options::Required);
@@ -247,6 +249,8 @@ static VBridgeImpl vbridgeImplFromArgs() {
 
   Log = JsonLogger(no_logging.Get(), no_file_logging.Get(), no_console_logging.Get(), log_path.Get());
 
+  ProgramOutputStoreFile.open(program_output_path.Get());
+
   Config cosim_config {
     .bin_path = bin_path.Get(),
     .wave_path = wave_path.Get(),