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[/] [forwardcom/] [bintools/] [main.cpp] - Blame information for rev 65

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1 63 Agner
/****************************  main.cpp   *******************************
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* Author:        Agner Fog
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* Date created:  2017-04-17
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* Last modified: 2020-11-25
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* Version:       1.11
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* Project:       Binary tools for ForwardCom instruction set
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* Description:   This includes assembler, disassembler, linker, library
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*                manager, and emulator in one program
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*
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* Instructions:
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* Run with option -h for help
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*
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* For detailed instructions, see forwardcom.pdf
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*
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* (c) Copyright 2017-2020 GNU General Public License version 3
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* http://www.gnu.org/licenses
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*****************************************************************************/
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#include "stdafx.h"
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// Check if running on little endian system
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static void CheckEndianness();
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// Buffer for symbol names is made global in order to make it accessible to operators:
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// bool operator < (ElfFWC_Sym2 const &, ElfFWC_Sym2 const &)
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// bool operator < (SStringEntry const & a, SStringEntry const & b)
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// bool operator < (SSymbolEntry const & a, SSymbolEntry const & b)
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CTextFileBuffer symbolNameBuffer;      // Buffer for symbol names during assembly, linking, and library operations
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                                       // Main. Program starts here
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int main(int argc, char * argv[]) {
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    CheckEndianness();                  // Check that machine is little-endian
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#ifdef  _DEBUG
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   // For debugging only: Read command line from file resp.txt
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    if (argc == 1) {
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        char commandline[] = "@resp.txt";
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        char * dummyarg[] = { argv[0],  commandline};
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        argc = 2; argv = dummyarg;
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    }
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#endif
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    cmd.readCommandLine(argc, argv);             // Read command line parameters   
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    if (cmd.job == CMDL_JOB_HELP) return 0;      // Help screen has been printed. Do nothing else
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    CConverter maincvt;                          // This object takes care of all conversions etc.
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    maincvt.go();                                // Do everything the command line says
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    if (cmd.verbose && cmd.job != CMDL_JOB_EMU)  printf("\n"); // End with newline
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    if (err.getWorstError()) cmd.mainReturnValue = err.getWorstError(); // Return with error code
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    return cmd.mainReturnValue;
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}
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CConverter::CConverter() {
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    // Constructor
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}
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void CConverter::go() {
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    // Do whatever the command line parameters say
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    switch (cmd.job) {
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    case CMDL_JOB_DUMP:
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        // File dump requested
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        readInputFile();
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        if (err.number()) return;
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        switch (fileType) {
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        case FILETYPE_FWC: case FILETYPE_ELF:
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            dumpELF();  break;
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        default:
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            err.submit(ERR_DUMP_NOT_SUPPORTED, getFileFormatName(fileType));  // Dump of this file type not supported
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        }
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        printf("\n");                              // New line
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        break;
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    case CMDL_JOB_ASS:
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        // assemble
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        readInputFile();
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        if (err.number()) return;
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        assemble();
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        break;
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    case CMDL_JOB_DIS:
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        // disassemble
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        readInputFile();
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        if (err.number()) return;
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        disassemble();
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        break;
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    case CMDL_JOB_LINK:
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    case CMDL_JOB_RELINK:
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        link();          // linker
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        break;
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    case CMDL_JOB_LIB:
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        readInputFile();
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        if (err.number()) return;
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        lib();        // library manager
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        break;
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    case CMDL_JOB_EMU:
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        emulate();    // emulator
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        break;
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    case 0: return; // no job. command line error
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    default:
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        err.submit(ERR_INTERNAL);
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    }
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}
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// read input file
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void CConverter::readInputFile() {
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    // Ignore nonexisting filename when building library
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    int IgnoreError = (cmd.fileOptions & CMDL_FILE_IN_IF_EXISTS);
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    // Read input file
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    read(cmd.getFilename(cmd.inputFile), IgnoreError);
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    if (cmd.job == CMDL_JOB_ASS) fileType = FILETYPE_ASM;
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    else getFileType();                 // Determine file type
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    if (err.number()) return;           // Return if error
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    cmd.inputType = fileType;           // Save input file type in cmd for access from other modules
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    if (cmd.outputType == 0) {
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        // desired type not specified
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        cmd.outputType = fileType;
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    }
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}
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void CConverter::dumpELF() {
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    // Dump ELF file
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    // Make object for interpreting 32 bit ELF file
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    CELF elf;
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    *this >> elf;                      // Give it my buffer
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    elf.parseFile();                   // Parse file buffer
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    if (err.number()) return;          // Return if error
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    elf.dump(cmd.dumpOptions);         // Dump file
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    *this << elf;                      // Take back my buffer
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}
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void CConverter::assemble() {
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    // Aassemble to ELF file
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    // Make instance of assembler
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    CAssembler ass;
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    if (err.number()) return;
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    *this >> ass;                      // Give it my buffer
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    ass.go();                          // run
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}
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void CConverter::disassemble() {
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    // Disassemble ELF file
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    // Make instance of disassembler
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    CDisassembler dis;
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    if (err.number()) return;
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    *this >> dis;                      // Give it my buffer
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    dis.parseFile();                   // Parse file buffer
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    if (err.number()) return;          // Return if error
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    dis.getComponents1();              // Get components from ELF file
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    dis.go();                          // Convert
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}
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void CConverter::lib() {
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    // Library manager
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    // Make instance of library manager
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    CLibrary libmanager;
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    if (err.number()) return;
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    *this >> libmanager;               // Give it my buffer
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    libmanager.go();                   // Do the job
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}
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void CConverter::link() {
171
    // Linker
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    // Make instance of linker
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    CLinker linker;
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    linker.go();                   // Do the job
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}
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void CConverter::emulate() {
178
    // Emulator
179
    // Make instance of linker
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    CEmulator emulator;
181
    emulator.go();                   // Do the job
182
}
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// Convert half precision floating point number to single precision
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// Optional support for subnormals
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// NAN payload is right-justified for ForwardCom
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float half2float(uint32_t half, bool supportSubnormal) {
188
    union {
189
        uint32_t hhh;
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        float fff;
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        struct {
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            uint32_t mant: 23;
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            uint32_t expo:  8;
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            uint32_t sign:  1;
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        };
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    } u;
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    u.hhh  = (half & 0x7fff) << 13;              // Exponent and mantissa
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    u.hhh += 0x38000000;                         // Adjust exponent bias
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    if ((half & 0x7C00) == 0) {// Subnormal
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        if (supportSubnormal) {
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            u.hhh = 0x3F800000 - (24 << 23);     // 2^-24
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            u.fff *= int(half & 0x3FF);          // subnormal value = mantissa * 2^-24
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        }
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        else {
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            u.hhh = 0;                           // make zero
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        }
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    }
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    if ((half & 0x7C00) == 0x7C00) {             // infinity or nan
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        u.expo = 0xFF;
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        if (half & 0x3FF) {  // nan
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            u.mant = 1 << 22 | (half & 0x1FF);   // NAN payload is right-justified only in ForwardCom
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        }
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    }
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    u.hhh |= (half & 0x8000) << 16;              // sign bit
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    return u.fff;
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}
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// Convert floating point number to half precision.
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// Round to nearest or even. 
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// Optional support for subnormals
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// NAN payload is right-justified
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uint16_t float2half(float x, bool supportSubnormal) {
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    union {                                      // single precision float
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        float f;
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        struct {
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            uint32_t mant: 23;
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            uint32_t expo:  8;
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            uint32_t sign:  1;
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        };
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    } u;
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    union {                                      // half precision float
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        uint16_t h;
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        struct {
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            uint16_t mant: 10;
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            uint16_t expo:  5;
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            uint16_t sign:  1;
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        };
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    } v;
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    u.f = x;
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    v.sign = u.sign;
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    v.mant = u.mant >> 13;                       // get upper part of mantissa
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    if (u.mant & (1 << 12)) {                    // round to nearest or even
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        if ((u.mant & ((1 << 12) - 1)) || (v.mant & 1)) { // round up if odd or remaining bits are nonzero
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            v.h++;                               // overflow here will give infinity
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        }
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    }
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    v.expo = u.expo - 0x70;
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    if (u.expo == 0xFF) {                        // infinity or nan
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        v.expo = 0x1F;
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        if (u.mant != 0) {                       // Nan
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            v.mant = (u.mant & 0x1FF) | 0x200;   // NAN payload is right-justified only in ForwardCom        
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        }
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    }
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    else if (u.expo > 0x8E) {
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        v.expo = 0x1F;  v.mant = 0;              // overflow -> inf
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    }
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    else if (u.expo < 0x71) {
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        v.expo = 0;
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        if (supportSubnormal) {
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            u.expo += 24;
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            u.sign = 0;
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            v.mant = int(u.f) & 0x3FF;
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        }
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        else {
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            v.mant = 0;                          // underflow -> 0
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        }
268
    }
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    return v.h;
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}
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// Convert double precision floating point number to half precision. 
273
// subnormals optionally supported
274
// Nan payloads not preserved
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uint16_t double2half(double x, bool supportSubnormal) {
276
    union {
277
        double d;
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        struct {
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            uint64_t mant: 52;
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            uint64_t expo: 11;
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            uint64_t sign:  1;
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        };
283
    } u;
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    union {
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        uint16_t h;
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        struct {
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            uint16_t mant: 10;
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            uint16_t expo:  5;
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            uint16_t sign:  1;
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        };
291
    } v;
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    u.d = x;
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    v.mant = u.mant >> 42;                       // get upper part of mantissa
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    if (u.mant & ((uint64_t)1 << 41)) {          // round to nearest or even
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        if ((u.mant & (((uint64_t)1 << 41) - 1)) || (v.mant & 1)) { // round up if odd or remaining bits are nonzero
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            v.h++;                               // overflow here will give infinity
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        }
298
    }
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    v.expo = u.expo - 0x3F0;
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    v.sign = u.sign;
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    if (u.expo == 0x7FF) {
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        v.expo = 0x1F;                           // infinity or nan
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        if (u.mant != 0 && v.mant == 0) v.mant = 0x200;  // make sure output is a nan if input is nan
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    }
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    else if (u.expo > 0x40E) {
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        v.expo = 0x1F;  v.mant = 0;              // overflow -> inf
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    }
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    else if (u.expo < 0x3F1) {                   // underflow
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        v.expo = 0;
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        if (supportSubnormal) {
311
            u.expo += 24;
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            u.sign = 0;
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            v.mant = int(u.d) & 0x3FF;
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        }
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        else {
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            v.mant = 0;                          // underflow -> 0
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        }
318
    }
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    return v.h;
320
}
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// Check that we are running on a machine with little-endian memory 
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// organization and right data representation
325
static void CheckEndianness() {
326
    static uint8_t bytes[4] = { 1, 2, 3, 0xC0 };
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    uint8_t * bb = bytes;
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    if (*(uint32_t*)bb != 0xC0030201) {
329
        err.submit(ERR_BIG_ENDIAN);        // Big endian
330
    }
331
    if (*(int32_t*)bb != -1073544703) {
332
        err.submit(ERR_BIG_ENDIAN);        // not two's complement
333
    }
334
    *(float*)bb = 1.0f;
335
    if (*(uint32_t*)bb != 0x3F800000) {
336
        err.submit(ERR_BIG_ENDIAN);        // Not IEEE floating point format
337
    }
338
}
339
 
340
 
341
// Bit scan reverse. Returns floor(log2(x)), 0 if x = 0
342
uint32_t bitScanReverse(uint64_t x) {
343
    uint32_t s = 32;  // shift count
344
    uint32_t r = 0;   // return value
345
    uint64_t y;       // x >> s
346
    do {
347
        y = x >> s;
348
        if (y) {
349
            r += s;
350
            x = y;
351
        }
352
        s >>= 1;
353
    }
354
    while (s);
355
    return r;
356
}
357
 
358
// Bit scan forward. Returns index to the lowest set bit, 0 if x = 0
359
uint32_t bitScanForward(uint64_t x) {
360
    uint32_t s = 32;  // shift count
361
    uint32_t r = 0;   // return value
362
    if (x == 0) return 0;
363
    do {
364
        if ((x & (((uint64_t)1 << s) - 1)) == 0) {
365
            x >>= s;
366
            r += s;
367
        }
368
        s >>= 1;
369
    }
370
    while (s);
371
    return r;
372
}
373
 
374
const char * timestring(uint32_t t) {
375
    // Convert 32 bit time stamp to string
376
    // Fix the problem that time_t may be 32 bit or 64 bit
377
    union {
378
        time_t t;
379
        uint32_t t32;
380
    } utime;
381
    utime.t = 0;
382
    utime.t32 = t;
383
    const char * string = ctime(&utime.t);
384
    if (string == 0) string = "?";
385
    return string;
386
}

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