oracle works

mipsevm/mipsevm.go

@@ -83,7 +83,21 @@ func (s *StateDB) GetState(fakeaddr common.Address, hash common.Hash) common.Has
 		}
 		if ram[nret] == 0xC {
 			syscall := ram[0xc0000008]
-			if syscall == 4004 {
+			if syscall == 4020 {
+				oracle_hash := make([]byte, 0x20)
+				for i := uint32(0); i < 0x20; i += 4 {
+					binary.BigEndian.PutUint32(oracle_hash[i:i+4], ram[0x30001000+i])
+				}
+				hash := common.BytesToHash(oracle_hash)
+				key := fmt.Sprintf("/tmp/eth/%s", hash)
+				value, _ := ioutil.ReadFile(key)
+				ram[0x31000000] = uint32(len(value))
+
+				value = append(value, 0, 0, 0)
+				for i := uint32(0); i < ram[0x31000000]; i += 4 {
+					ram[0x31000004+i] = binary.BigEndian.Uint32(value[i : i+4])
+				}
+			} else if syscall == 4004 {
 				len := ram[0xc0000018]
 				buf := make([]byte, len+0x10)
 				addr := ram[0xc0000014]