Add --dump-config-string flag

riscv/sim.h

@@ -29,6 +29,7 @@ public:
   void set_histogram(bool value);
   void set_procs_debug(bool value);
   htif_isasim_t* get_htif() { return htif.get(); }
+  const char* get_config_string() { return &config_string->contents()[0]; }
 
   // returns the number of processors in this simulator
   size_t num_cores() { return procs.size(); }

spike_main/spike.cc

@@ -29,6 +29,7 @@ static void help()
   fprintf(stderr, "  --l2=<S>:<W>:<B>        B both powers of 2).\n");
   fprintf(stderr, "  --extension=<name>    Specify RoCC Extension\n");
   fprintf(stderr, "  --extlib=<name>       Shared library to load\n");
+  fprintf(stderr, "  --dump-config-string  Print platform configuration string and exit\n");
   exit(1);
 }
 
@@ -37,6 +38,7 @@ int main(int argc, char** argv)
   bool debug = false;
   bool histogram = false;
   bool log = false;
+  bool dump_config_string = false;
   size_t nprocs = 1;
   size_t mem_mb = 0;
   std::unique_ptr<icache_sim_t> ic;
@@ -58,6 +60,7 @@ int main(int argc, char** argv)
   parser.option(0, "l2", 1, [&](const char* s){l2.reset(cache_sim_t::construct(s, "L2$"));});
   parser.option(0, "isa", 1, [&](const char* s){isa = s;});
   parser.option(0, "extension", 1, [&](const char* s){extension = find_extension(s);});
+  parser.option(0, "dump-config-string", 0, [&](const char *s){dump_config_string = true;});
   parser.option(0, "extlib", 1, [&](const char *s){
     void *lib = dlopen(s, RTLD_NOW | RTLD_GLOBAL);
     if (lib == NULL) {
@@ -67,11 +70,17 @@ int main(int argc, char** argv)
   });
 
   auto argv1 = parser.parse(argv);
-  if (!*argv1)
-    help();
   std::vector<std::string> htif_args(argv1, (const char*const*)argv + argc);
   sim_t s(isa, nprocs, mem_mb, htif_args);
 
+  if (dump_config_string) {
+    printf("%s", s.get_config_string());
+    return 0;
+  }
+
+  if (!*argv1)
+    help();
+
   if (ic && l2) ic->set_miss_handler(&*l2);
   if (dc && l2) dc->set_miss_handler(&*l2);
   for (size_t i = 0; i < nprocs; i++)