refactor(cpu): different kind of exec

Author: EmbroiderSnow

sim/include/cpu.h

@@ -15,9 +15,18 @@ typedef struct {
 } CPU_state;
 
 void init_cpu();
-void cpu_exec();
-void exec_once();
-void exec_single_inst(uint32_t inst);
 void halt_trap(uint64_t pc, uint64_t code);
 
+// ------------ ISS SIM ------------
+void iss_cpu_exec();
+void iss_exec_once();
+
+// --------- Multi-cycle SIM ---------
+void mc_cpu_exec();
+void mc_exec_once();
+
+// ---------- Pipeline SIM -----------
+void pl_cpu_exec();
+void pl_exec_once();
+
 #endif

sim/src/cpu.c

@@ -19,7 +19,7 @@ void init_cpu(){
     memset(cpu.csr, 0, sizeof(cpu.csr));
 }
 
-void exec_once(){
+void iss_exec_once() {
     Decode s;
     s.pc   = cpu.pc;
     s.inst = inst_fetch(s.pc);
@@ -34,15 +34,9 @@ void exec_once(){
     cpu.pc = s.dnpc;
 }
 
-void exec_single_inst(uint32_t inst) {
-    Decode s;
-    s.inst = inst;
-    decode_exec(&s);
-}
-
-void cpu_exec(){
-    while(running){
-        exec_once();
+void iss_cpu_exec() {
+    while (running) {
+        iss_exec_once();
     }
 }
 

sim/src/dbg.c

@@ -2,7 +2,7 @@
 #include <memory.h>
 #include <common.h>
 #include <dbg.h>
-#include <decode.h>
+#include <isa_decode.h>
 #include <disasm.h>
 #include "ftrace.h"
 
@@ -27,7 +27,7 @@ static void cmd_help() {
 }
 
 static void cmd_continue() {
-    cpu_exec();
+    iss_cpu_exec();
 }
 
 static void cmd_quit() {
@@ -61,7 +61,7 @@ static void cmd_step(int steps) {
         }
 
         // Execute the instruction
-        exec_once(); 
+        iss_exec_once(); 
     }
 }
 

sim/src/main.c

@@ -66,16 +66,16 @@ int run_iss_model(int argc, char *argv[]) {
         debug_loop();
     }
     else if (argc > 2 && strcmp(argv[2], "--batch") == 0) {
-        cpu_exec();
+        iss_cpu_exec();
     }
     else if (argc > 2 && strcmp(argv[2], "--itrace") == 0) {
         itrace_enabled = 1;
         init_llvm_disassembler();
-        cpu_exec();
+        iss_cpu_exec();
     }
     else if (argc > 2 && strcmp(argv[2], "--ftrace") == 0) {
         ftrace_enabled = 1;
-        cpu_exec();
+        iss_cpu_exec();
     }
     else {
         printf("%s", help_string);