adds riscv_hart_common and signature output

src/iss/arch/riscv_hart_common.h

@@ -36,7 +36,12 @@
 #define _RISCV_HART_COMMON
 
 #include "iss/arch_if.h"
+#include "iss/log_categories.h"
 #include <cstdint>
+#include <elfio/elfio.hpp>
+#include <fmt/format.h>
+#include <string>
+#include <unordered_map>
 
 namespace iss {
 namespace arch {
@@ -296,6 +301,61 @@ inline void write_reg_uint32(uint64_t offs, uint32_t& reg, const uint8_t* const
         break;
     }
 }
+struct riscv_hart_common {
+    riscv_hart_common(){};
+    ~riscv_hart_common(){};
+    std::unordered_map<std::string, uint64_t> symbol_table;
+
+    std::unordered_map<std::string, uint64_t> get_sym_table(std::string name) {
+        if(!symbol_table.empty())
+            return symbol_table;
+        FILE* fp = fopen(name.c_str(), "r");
+        if(fp) {
+            std::array<char, 5> buf;
+            auto n = fread(buf.data(), 1, 4, fp);
+            fclose(fp);
+            if(n != 4)
+                throw std::runtime_error("input file has insufficient size");
+            buf[4] = 0;
+            if(strcmp(buf.data() + 1, "ELF") == 0) {
+                // Create elfio reader
+                ELFIO::elfio reader;
+                // Load ELF data
+                if(!reader.load(name))
+                    throw std::runtime_error("could not process elf file");
+                // check elf properties
+                if(reader.get_type() != ET_EXEC)
+                    throw std::runtime_error("wrong elf type in file");
+                if(reader.get_machine() != EM_RISCV)
+                    throw std::runtime_error("wrong elf machine in file");
+                const auto sym_sec = reader.sections[".symtab"];
+                if(SHT_SYMTAB == sym_sec->get_type() || SHT_DYNSYM == sym_sec->get_type()) {
+                    ELFIO::symbol_section_accessor symbols(reader, sym_sec);
+                    auto sym_no = symbols.get_symbols_num();
+                    std::string name;
+                    ELFIO::Elf64_Addr value = 0;
+                    ELFIO::Elf_Xword size = 0;
+                    unsigned char bind = 0;
+                    unsigned char type = 0;
+                    ELFIO::Elf_Half section = 0;
+                    unsigned char other = 0;
+                    for(auto i = 0U; i < sym_no; ++i) {
+                        symbols.get_symbol(i, name, value, size, bind, type, section, other);
+                        if(name != "") {
+                            this->symbol_table[name] = value;
+#ifndef NDEBUG
+                            LOG(DEBUG) << "Found Symbol " << name;
+#endif
+                        }
+                    }
+                }
+                return symbol_table;
+            }
+            throw std::runtime_error(fmt::format("memory load file {} is not a valid elf file", name));
+        } else
+            throw std::runtime_error(fmt::format("memory load file not found, check if {} is a valid file", name));
+    };
+};
 
 } // namespace arch
 } // namespace iss