Add -H to start halted.

riscv/gdbserver.cc

@@ -15,6 +15,7 @@
 #include "disasm.h"
 #include "sim.h"
 #include "gdbserver.h"
+#include "mmu.h"
 
 template <typename T>
 unsigned int circular_buffer_t<T>::size() const

riscv/sim.cc

@@ -20,7 +20,7 @@ static void handle_signal(int sig)
   signal(sig, &handle_signal);
 }
 
-sim_t::sim_t(const char* isa, size_t nprocs, size_t mem_mb,
+sim_t::sim_t(const char* isa, size_t nprocs, size_t mem_mb, bool halted,
              const std::vector<std::string>& args)
   : htif(new htif_isasim_t(this, args)), procs(std::max(nprocs, size_t(1))),
     current_step(0), current_proc(0), debug(false)
@@ -43,8 +43,10 @@ sim_t::sim_t(const char* isa, size_t nprocs, size_t mem_mb,
 
   debug_mmu = new mmu_t(this, NULL);
 
-  for (size_t i = 0; i < procs.size(); i++)
+  for (size_t i = 0; i < procs.size(); i++) {
     procs[i] = new processor_t(isa, this, i);
+    procs[i]->set_halted(halted);
+  }
 
   rtc.reset(new rtc_t(procs));
   make_config_string();

riscv/sim.h

@@ -17,7 +17,7 @@ class mmu_t;
 class sim_t
 {
 public:
-  sim_t(const char* isa, size_t _nprocs, size_t mem_mb,
+  sim_t(const char* isa, size_t _nprocs, size_t mem_mb, bool halted,
         const std::vector<std::string>& htif_args);
   ~sim_t();
 

spike_main/spike.cc

@@ -10,7 +10,6 @@
 #include <fesvr/option_parser.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <getopt.h>
 #include <vector>
 #include <string>
 #include <memory>
@@ -25,6 +24,7 @@ static void help()
   fprintf(stderr, "  -g                    Track histogram of PCs\n");
   fprintf(stderr, "  -l                    Generate a log of execution\n");
   fprintf(stderr, "  -h                    Print this help message\n");
+  fprintf(stderr, "  -H                 Start halted, allowing a debugger to connect\n");
   fprintf(stderr, "  --isa=<name>          RISC-V ISA string [default %s]\n", DEFAULT_ISA);
   fprintf(stderr, "  --ic=<S>:<W>:<B>      Instantiate a cache model with S sets,\n");
   fprintf(stderr, "  --dc=<S>:<W>:<B>        W ways, and B-byte blocks (with S and\n");
@@ -38,6 +38,7 @@ static void help()
 int main(int argc, char** argv)
 {
   bool debug = false;
+  bool halted = false;
   bool histogram = false;
   bool log = false;
   bool dump_config_string = false;
@@ -70,10 +71,12 @@ int main(int argc, char** argv)
       exit(-1);
     }
   });
+  // I wanted to use --halted, but for some reason that doesn't work.
+  parser.option('H', 0, 0, [&](const char* s){halted = true;});
 
   auto argv1 = parser.parse(argv);
   std::vector<std::string> htif_args(argv1, (const char*const*)argv + argc);
-  sim_t s(isa, nprocs, mem_mb, htif_args);
+  sim_t s(isa, nprocs, mem_mb, halted, htif_args);
   gdbserver_t gdbserver(9824, &s);
   s.set_gdbserver(&gdbserver);