Lab 6 Due Date: Wednesday, April 5, /usr/local/3302/include/direct linking loader.h Driver File:

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1 Source File: ~/3302/lab06.C Specification File: /usr/local/3302/include/direct linking loader.h Driver File: /usr/local/3302/src/lab06main.c Implementation Starter File: /usr/local/3302/src/lab06.c.start Sample Makefile: /usr/local/3302/src/makefile Sample Input Files: /usr/local/3302/data/06/asmpgm##.objmod Sample Output Files: /usr/local/3302/data/06/asmpgm##.loadmod /usr/local/3302/data/06/asmpgm##.loadmap Value: 5 THE DIRECT-LINKING LOADER The direct-linking loader will accept the object modules produced by the assembler and link and relocate the modules. Output from the direct-linking loader will consist of two files: one for the load module and a second for a load map. The load module will contain machine code for the CS3302 machine and will be directly executable. Table 1 shows the format of a load map. The direct-linking loader must be able to detect the following errors: UEA, unresolved external address and MDS, multiply-defined symbol. Upon detection of either of these errors, the three letter code should be written to the load module and processing should halt. Column(s) Meaning Table 1. Format of Load Map Produced by DLL 1 1 Carriage control character 2 2 Blank 3 6 Module Name left-justified 7 10 Blank Module Address right-justified, zero-filled hexadecimal number Blank Entry Point Name left-justified Blank Entry Point Address right-justified, zero-filled hexadecimal number A specification file for Lab 6 is shown in Figure 1. A main function for testing your implementation file is shown in Figure 2. A sample Makefile is shown in Figure 3. A sample implementation file is shown in Figure 4. Commands to compile, link, and run this assignment are shown in Figure 5. CS 3302 Introduction to Systems Programming Page 1

2 1 #ifndef DIRECT_LINKING_LOADER_H 2 #define DIRECT_LINKING_LOADER_H 3 4 #include <iostream> 5 #include <fstream> 6 #include <sstream> 7 #include <iomanip> #include <cctype> 9 #include <cstdlib> 10 #include <string> 11 #include <vector> 12 #include <algorithm> 13 #include <functional> using namespace std; class CESDTableEntry 1 { 19 public: 20 CESDTableEntry() 21 { } 22 void SetName(string s) 23 { name = s; } 24 void SetType(string s) 25 { type = s; } 26 void SetRelocationAddress(string s) 27 { relocationaddress = s; } 2 void SetLength(string s) 29 { length = s; } 30 string GetName() const 31 { return name; } 32 string GetType() const 33 { return type; } 34 string GetRelocationAddress() const 35 { return relocationaddress; } 36 string GetLength() const 37 { return length; } 3 private: 39 string name; 40 string type; 41 string relocationaddress; 42 string length; 43 }; 44 Figure 1. /usr/local/3341/include/direct linking loader.h (Part 1 of 2) Page 2 CS 3302 Introduction to Systems Programming

3 45 class CRLDTableEntry 46 { 47 public: 4 CRLDTableEntry() 49 { } 50 void SetName(string s) 51 { name = s; } 52 void SetRelocationAddress(string s) 53 { relocationaddress = s; } 54 string GetName() const 55 { return name; } 56 string GetRelocationAddress() const 57 { return relocationaddress; } 5 private: 59 string name; 60 string relocationaddress; 61 }; class DirectLinkingLoader 64 { 65 public: 66 DirectLinkingLoader(); 67 void Start(int, char **); 6 private: 69 ifstream objmodfile; // logical name for object module file 70 ofstream loadmodfile; // logical name for load module file 71 ofstream loadmapfile; // logical name for load map file int relocationfactor; 74 int lengthofmodule; bool MDSError; // Flag for multiply-defined symbol error 77 bool UEAError; // Flag for unresolved external address err 7 79 const string loadmapheading; 0 1 vector<cesdtableentry> CESD; 2 vector<string> CTXT; 3 vector<crldtableentry> CRLD; 4 5 void OpenFiles(int, char**); 6 void PassOne(); 7 void BetweenPasses(); void PassTwo(); 9 void WriteLoadMod(); 90 void WriteLoadMap(); 91 }; #endif Figure 1. /usr/local/3341/include/direct linking loader.h (Part 2 of 2) CS 3302 Introduction to Systems Programming Page 3

4 1 #include <direct_linking_loader.h> 2 3 using namespace std; 4 5 int main(int argc, char **argv) 6 { 7 DirectLinkingLoader DLL; 9 DLL.Start(argc, argv); return EXIT_SUCCESS; 12 } Figure 2. /usr/local/3302/src/lab06main.c 1 INCLUDE_DIRS = -I/usr/local/3302/include 2 LINK_DIRS = 3 LFLAGS = -lm 4 CFLAGS = -g -Wall 5 6 CC = g++ 7.SUFFIXES:.o.C 9.C.o: 10 $(CC) $(CFLAGS) -c $< $(INCLUDE_DIRS) targets = lab04 lab05 lab06 lab $(targets): $$@main.o $$@.o 15 $(CC) -o $@ $@main.o $@.o $(LINK_DIRS) $(LFLAGS) clean: 1 rm -f *.o core *~ $(targets) Figure 3. /usr/local/3302/src/makefile Page 4 CS 3302 Introduction to Systems Programming

5 1 #include <direct_linking_loader.h> 2 3 using namespace std; 4 5 DirectLinkingLoader::DirectLinkingLoader() : 6 loadmapheading(" LOAD MAP\n MODULE ADDRESS ENTRY ADDRESS\n") 7 { } 9 void DirectLinkingLoader::Start(int argc, char **argv) 10 { 11 OpenFiles(argc, argv); relocationfactor = lengthofmodule = 0; 14 MDSError = UEAError = false; PassOne(); 17 if (MDSError) { } 20 BetweenPasses(); 21 if (UEAError) { } 24 PassTwo(); 25 WriteLoadMod(); 26 WriteLoadMap(); 27 2 objmodfile.close(); 29 loadmodfile.close(); 30 loadmapfile.close(); 31 } Figure 4. /usr/local/3302/src/lab06.c.start /062/src-> cp /usr/local/3302/src/lab06main.c /062/src-> make lab06 3 g++ -g -Wall -c lab06main.c -I/usr/local/3302/include 4 g++ -g -Wall -c lab06.c -I/usr/local/3302/include 5 g++ -o lab06 lab06main.o lab06.o -lm /062/src-> lab06 /usr/local/3302/data/06/asmpgm01.objmod /062/src-> ls -l asmpgm01* -rw-r--r-- 1 mmotl staff 2370 Mar 1 0:04 asmpgm01.listing 9 -rw-r--r-- 1 mmotl staff 140 Mar 29 0:01 asmpgm01.loadmap 10 -rw-r--r-- 1 mmotl staff 224 Mar 29 0:01 asmpgm01.loadmod 11 -rw-r--r-- 1 mmotl staff 36 Mar 1 0:04 asmpgm01.objmod /062/src-> Figure 5. Commands to Compile, Link, & Run Lab 06 CS 3302 Introduction to Systems Programming Page 5