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Rev 35 → Rev 36

/bintools/linker.h
0,0 → 1,210
/**************************** linker.h ************************************
* Author: Agner Fog
* date created: 2017-11-14
* Last modified: 2020-05-19
* Version: 1.10
* Project: Binary tools for ForwardCom instruction set
* Module: linker.h
* Description:
* header file for linker
*
* Copyright 2017-2020 GNU General Public License http://www.gnu.org/licenses
*****************************************************************************/
 
// Structure for list of imported library modules
struct SLibraryModule {
uint32_t library; // library number. msb set if symbols have been registered
uint32_t offset; // offset in executable file or library
uint32_t modul; // index into modules2 buffer
};
 
// operator < for sorting library modules
static inline bool operator < (SLibraryModule const & a, SLibraryModule const & b) {
if ((a.library << 1) != (b.library << 1)) return (a.library << 1) < (b.library << 1);
return a.offset < b.offset;
}
 
// Structure for storing name of relinkable module from input file
struct SRelinkModule {
uint32_t libraryName; // name of library that the module comes from (as index into cmd.fileNameBuffer)
uint32_t moduleName; // name of module (as index into cmd.fileNameBuffer)
};
 
// operator < for sorting relink module list
static inline bool operator < (SRelinkModule const & a, SRelinkModule const & b) {
// compare library names. (libraryName = 0 will give "")
int j = strcmp(cmd.getFilename(a.libraryName), cmd.getFilename(b.libraryName));
if (j) return j < 0;
// compare module names
j = strcmp(cmd.getFilename(a.moduleName), cmd.getFilename(b.moduleName));
return j < 0;
}
 
// operator < for sorting event list
static inline bool operator < (ElfFwcEvent const & a, ElfFwcEvent const & b) {
if (a.event != b.event) return a.event < b.event;
if (a.key != b.key) return a.key < b.key;
return a.priority > b.priority;
}
 
 
// Structure for list of sections. Sorted by the order in which they should be placed in the executable
struct SLinkSection {
uint64_t sh_size; // Section size in bytes
uint64_t sh_addr; // address in executable
uint32_t sh_flags; // Section flags
uint32_t sh_type; // Section type
uint32_t name; // section name as index into cmd.fileNameBuffer
uint32_t sh_module; // module containing section (index into modules2)
uint32_t sectioni; // section index within module
uint32_t sectionx; // section index in final executable
uint32_t order; // section must occur in this order in executable file
uint8_t sh_align; // alignment = 1 << sh_align
};
 
// Same structure, sorted by sh_module and sectioni
struct SLinkSection2 : public SLinkSection {
};
 
// operator < for sorting section list by the order in which they should be placed in the executable
static inline bool operator < (SLinkSection const & a, SLinkSection const & b) {
if (a.order != b.order) return a.order < b.order;
// same type and flags. sort by name
int j = strcmp(cmd.getFilename(a.name), cmd.getFilename(b.name));
if (j != 0) return j < 0;
// same name. sort by module
return a.sh_module < b.sh_module;
}
 
// operator < for sorting section list by sh_module and sectioni
static inline bool operator < (SLinkSection2 const & a, SLinkSection2 const & b) {
if (a.sh_module != b.sh_module) return a.sh_module < b.sh_module;
return a.sectioni < b.sectioni;
}
 
// extended relocation record used temporarily during linking
struct SReloc2 : public ElfFwcReloc {
uint32_t modul; // module containing specified r_section
bool symLocal; // r_sym is in same module. reference by number rather than by name
bool refSymLocal; // r_refsym is in same module. reference by number rather than by name
};
 
// symbol cross reference record for connecting symbol records in local modules to records in executable file
struct SSymbolXref {
uint32_t name; // symbol name as index into global symbolNameBuffer
uint32_t modul; // module containing symbol
uint32_t symi; // index into symbols buffer within module
uint32_t symx; // index into symbols buffer in outFile
bool isPublic; // symbol is public or exported
bool isWeak; // symbol is weak
};
 
struct SSymbolXref2 : public SSymbolXref {
};
 
// operator < for sorting symbol cross reference records by modul and symi
static inline bool operator < (SSymbolXref const & a, SSymbolXref const & b) {
if (a.modul != b.modul) return a.modul < b.modul;
return a.symi < b.symi;
}
 
// operator < for sorting symbol cross reference records by name
static inline bool operator < (SSymbolXref2 const & a, SSymbolXref2 const & b) {
return strcmp(symbolNameBuffer.getString(a.name), symbolNameBuffer.getString(b.name)) < 0;
}
 
// symbol record, sorted by name
struct SSymbol2 : public ElfFwcSym {
SSymbol2() {} // default constructor
SSymbol2(ElfFwcSym const & s) { // constructor to convert from normal symbol record
*static_cast<ElfFwcSym*>(this) = s;
}
};
// operator < for sorting symbol recordsby name
static inline bool operator < (SSymbol2 const & a, SSymbol2 const & b) {
return strcmp(symbolNameBuffer.getString(a.st_name), symbolNameBuffer.getString(b.st_name)) < 0;
}
 
 
// Class for linking or re-linking executable file
class CLinker {
public:
CLinker(); // Constructor
void go(); // Do whatever the command line says
protected:
void feedBackText1(); // write feedback text on stdout
void loadExeFile(); // load executable file to be relinked
void getReplaceNames(); // get names of modules and libraries to remove or replace
void markSectionsInInputFile(); // check which sections to keep or remove in executable input file
void extractModule(CELF & modul, uint32_t libname, uint32_t name); // extract a module from executable input file
void countReusedModules(); // count number of modules and libraries to reuse when relinking
void getRelinkObjects(); // get all reused objects into modules1 metabuffer
void extractModuleToFile(CELF & modu); // extract a module from relinkable file if requested
void getRelinkLibraries(); // recover relinkable library modules
void feedBackText2(); // write feedback to console
uint64_t ip_base; // pointer to end of const, begin of code
uint64_t datap_base; // pointer to end of data, begin of bss
uint64_t threadp_base; // pointer to begin of thread local memory
uint64_t entry_point; // entry point for executable startup code
uint32_t event_table; // address of event table
uint32_t event_table_num; // number of entries in event table
uint32_t unresolvedWeak; // there are unresolved weak imports
uint32_t unresolvedWeakNum; // number of unresolved weak imports for writeable data
uint32_t dummyConst; // address of dummy constant symbol for unresolved weak imports
uint32_t dummyData; // address of dummy data symbol for unresolved weak imports
uint32_t dummyThreadData; // address of dummy thread data symbol for unresolved weak imports
uint32_t dummyFunc; // address of dummy function for unresolved weak imports
uint32_t eventDataSize; // total size of all event data sections
uint32_t numObjects; // number of object files to add
uint32_t numLibraries; // number of library files to add
uint32_t numRelinkObjects; // number of relinkable object modules to reuse
uint32_t numRelinkLibraries; // number of relinkable library files to reuse
void fillBuffers(); // load specified object files and library files into buffers
void countModules(); // count number of modules and libraries to add
void makeSymbolList(); // make list of imported and exported symbols
void matchSymbols(); // match lists of imported and exported symbols
void librarySearch(); // search libraries for imported symbols
void checkDuplicateSymbols(); // check for duplicate symbols
void readLibraryModules(); // get imported library modules into modules2 buffer
void makeSectionList(); // make list of all sections
void sortSections(); // sort sections in the order in which they should occur in the executable file
void joinCommunalSections(); // join communal sections with same name
void makeDummySections(); // make dummy segments for unresolved weak externals
void makeEventList(); // make sorted list of events
void makeProgramHeaders(); // make program headers and assign addresses to sections
void specialSymbolsOverride(); // check if automatic symbols have been overridden
int32_t findModule(uint32_t library, uint32_t memberos);// find a module from a record in symbolExports
void relocate(); // put values into all cross references
void checkRegisterUse(ElfFwcSym * sym1, ElfFwcSym * sym2, uint32_t modul);// Check if external function call has compatible register use
ElfFwcSym * findSymbolAddress(uint64_t * a, uint32_t * targetModule, ElfFwcSym * sym, uint32_t modul); // find a symbol and its address
uint64_t findSymbolAddress(const char * name); // find the address of a symbol from its name
void copySections(); // copy sections to output file
void copySymbols(); // copy symbols to output file
void copyRelocations(); // copy relocation records to output file if needed
uint32_t resolveRelocationTarget(uint32_t modul, uint32_t symi);// resolve relocation target for executable file record
void makeFileHeader(); // make file header
CELF inputFile; // input file if relinking
CELF outFile; // output file
CMetaBuffer<CELF> modules1; // object files and modules from input exe file
CMetaBuffer<CELF> modules2; // same + object files from libraries
CMetaBuffer<CLibrary> libraries; // library files
CDynamicArray<SSymbolEntry> symbolExports; // list of exported symbols
CDynamicArray<SSymbolEntry> symbolImports; // list of imported symbols
CDynamicArray<SLinkSection> sections; // list of sections, sorted in memory order
CDynamicArray<SLinkSection> communalSections;// list of communal sections
CDynamicArray<SLinkSection2> sections2; // list of sections, sorted by module and section index
CDynamicArray<SLibraryModule> libmodules; // list of imported library modules
CDynamicArray<SReloc2> relocations2; // extended relocation records to be copied to executable file
CDynamicArray<SSymbolXref> symbolXref; // symbol index cross reference
CDynamicArray<SSymbolXref2> unresWeakSym; // list of unresolved weak symbols
CDynamicArray<SRelinkModule> relinkModules; // list of modules and libraries in input file to relink
CDynamicArray<SLCommand> rnames; // List of modules and libraries to delete or replace
CDynamicArray<ElfFwcEvent> eventData; // container for all event records
CELF memberBuffer; // buffer containing temporary copy of single library member
ElfFwcEhdr fileHeader; // file header for executable file
bool relinkable; // output file is relinkable
bool relinking; // relinking existing file
};
 
const uint32_t fillerInstruction = 0x7FFFFFFF; // binary representation of filler instruction

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