riscv64,exec: add csrrc and amoadd

src/isa/riscv64/exec/all-instr.h

@@ -53,4 +53,5 @@ make_EHelper(sraw);
 make_EHelper(srlw);
 
 make_EHelper(amoswap);
+make_EHelper(amoadd);
 make_EHelper(amoor);

src/isa/riscv64/exec/amo.c

@@ -11,6 +11,18 @@ make_EHelper(amoswap) {
   print_asm_template3(amoswap);
 }
 
+make_EHelper(amoadd) {
+  rtl_lm(&s0, &id_src->val, decinfo.width);
+  rtl_sext(&s0, &s0, decinfo.width);
+  rtl_sr(id_dest->reg, &s0, 0);
+
+  // add
+  rtl_add(&s0, &s0, &id_src2->val);
+  rtl_sm(&id_src->val, &s0, decinfo.width);
+
+  print_asm_template3(amoor);
+}
+
 make_EHelper(amoor) {
   rtl_lm(&s0, &id_src->val, decinfo.width);
   rtl_sext(&s0, &s0, decinfo.width);

src/isa/riscv64/exec/exec.c

@@ -60,7 +60,7 @@ static make_EHelper(op32) {
 
 static make_EHelper(system) {
   static OpcodeEntry table [8] = {
-    EX(priv), IDEX(csr, csrrw), IDEX(csr, csrrs), EMPTY, EMPTY, IDEX(csri, csrrw), IDEX(csri, csrrs), IDEX(csri, csrrc)
+    EX(priv), IDEX(csr, csrrw), IDEX(csr, csrrs), IDEX(csr, csrrc), EMPTY, IDEX(csri, csrrw), IDEX(csri, csrrs), IDEX(csri, csrrc)
   };
   idex(pc, &table[decinfo.isa.instr.funct3]);
 }
@@ -70,7 +70,7 @@ static make_EHelper(atomic) {
     EMPTY, EX(amoswap), EMPTY, EMPTY
   };
   static OpcodeEntry table_hi [8] = {
-    EMPTY, EMPTY, EX(amoor), EMPTY, EMPTY, EMPTY, EMPTY, EMPTY
+    EX(amoadd), EMPTY, EX(amoor), EMPTY, EMPTY, EMPTY, EMPTY, EMPTY
   };
 
   decinfo.width = 1 << decinfo.isa.instr.funct3;