feat: process custom gdb commands

include/api.hpp

@@ -53,10 +53,11 @@ class Target {
 public:
   DiffTargetApi ops;
   TargetMeta meta;
-  arch_info_t arch;
-  size_t argsize;
   std::vector<uint8_t> args; // used as a buffer to store target specific values
 
+  bool *do_difftest;
+  arch_info_t *isa_arch_info;
+  size_t *dbg_state_size;
   gdb_action_t last_res;
 
   Target(){};
@@ -68,4 +69,4 @@ public:
   bool is_on_breakpoint(const gdb_action_t &res) const;
 };
 
-#endif
+#endif

include/config.hpp

@@ -10,6 +10,8 @@ struct Config {
   std::vector<std::string> refs_prefix;
   std::filesystem::path dut;
   std::string dut_prefix = "";
+  std::string gdbstub_addr = "/tmp/gdbstub-diffu.sock";
+  bool use_debugger = false;
 
   int cli_parse(int argc, char **argv);
 };

include/difftest.hpp

@@ -16,8 +16,19 @@ private:
 
   // target used for read_reg, write_reg, read_mem, write_mem
   Target *current_target = &dut;
+  bool halt_status = false;
+  inline void start_run() {
+    __atomic_store_n(&halt_status, false, __ATOMIC_RELAXED);
+  };
+  inline bool is_halt() {
+    return __atomic_load_n(&halt_status, __ATOMIC_RELAXED);
+  };
 
-  bool exec(size_t n, gdb_action_t *ret);
+  struct ExecRet {
+    bool at_breakpoint;
+    bool do_difftest;
+  };
+  ExecRet exec(size_t n, gdb_action_t *ret);
 
 public:
   Difftest(Target &&dut, std::vector<Target> &&refs);
@@ -35,14 +46,16 @@ public:
   bool del_bp(size_t addr, bp_type_t type);
 
   bool check_all();
+  int sync_regs_to_ref(void);
 
-  arch_info_t get_arch() const {
-    std::cout << dut.arch.reg_num << std::endl;
-    return dut.arch;
-  }
+  inline void halt() {
+    __atomic_store_n(&halt_status, true, __ATOMIC_RELAXED);
+  };
+
+  arch_info_t get_arch() const { return *dut.isa_arch_info; }
 
   static bool check(Target &dut, Target &ref) {
-    for (int r = 0; r < dut.arch.reg_num; r++) {
+    for (int r = 0; r < dut.isa_arch_info->reg_num; r++) {
       size_t regdut = 0, regref = 0;
       dut.ops.read_reg(dut.args.data(), r, &regdut);
       ref.ops.read_reg(ref.args.data(), r, &regref);
@@ -92,4 +105,4 @@ public:
   Iterator end() { return Iterator(*this, refs.size(), false); }
 };
 
-#endif
+#endif