changes the io_buf

src/iss/arch/riscv_hart_common.h

@@ -314,11 +314,16 @@ inline void write_reg_uint32(uint64_t offs, uint32_t& reg, const uint8_t* const
 }
 struct riscv_hart_common {
     riscv_hart_common(){};
-    ~riscv_hart_common(){};
+    ~riscv_hart_common() {
+        if(io_buf.str().length()) {
+            CPPLOG(INFO) << "tohost send '" << io_buf.str() << "'";
+        }
+    };
     std::unordered_map<std::string, uint64_t> symbol_table;
     uint64_t entry_address{0};
     uint64_t tohost = std::numeric_limits<uint64_t>::max();
     uint64_t fromhost = std::numeric_limits<uint64_t>::max();
+    std::stringstream io_buf;
 
     bool read_elf_file(std::string name, uint8_t expected_elf_class,
                        std::function<iss::status(uint64_t, uint64_t, const uint8_t* const)> cb) {
@@ -378,7 +383,6 @@ struct riscv_hart_common {
         return false;
     };
     iss::status execute_sys_write(arch_if* aif, const std::array<uint64_t, 8>& loaded_payload, unsigned mem_type) {
-        std::stringstream io_buf;
         uint64_t fd = loaded_payload[1];
         uint64_t buf_ptr = loaded_payload[2];
         uint64_t len = loaded_payload[3];
@@ -389,15 +393,13 @@ struct riscv_hart_common {
         }
         // we disregard the fd and just log to stdout
         for(size_t i = 0; i < len; i++) {
-            if(buf[i] == '\n') {
+            if(buf[i] == '\n' || buf[i] == '\0') {
                 CPPLOG(INFO) << "tohost send '" << io_buf.str() << "'";
                 io_buf.str("");
             } else
                 io_buf << buf[i];
         }
-        if(io_buf.str().length()) {
-            CPPLOG(INFO) << "tohost send '" << io_buf.str() << "'";
-        }
+
         // Not sure what the correct return value should be
         uint8_t ret_val = 1;
         if(fromhost != std::numeric_limits<uint64_t>::max())