mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-19 18:46:30 +00:00
MakePEF: take symbols, relocs from loader section, entrypoint from aout header
This commit is contained in:
Wolfgang Thaller
parent
04621f8a01
commit
ba2f00dba1
@ -119,7 +119,8 @@ class ImportLib
|
||||
public:
|
||||
std::string path, base, mem;
|
||||
std::vector<std::string> imports;
|
||||
|
||||
std::vector<int> xcoffImportIndices;
|
||||
|
||||
int nameOffset;
|
||||
bool weak;
|
||||
|
||||
@ -131,12 +132,17 @@ public:
|
||||
}
|
||||
};
|
||||
|
||||
void mkpef(std::istream& in, std::ostream& out, std::string mainSymbol = "__start" )
|
||||
void mkpef(const std::string& inFn, const std::string& outFn)
|
||||
{
|
||||
std::ifstream in(inFn);
|
||||
|
||||
external_filehdr xcoffHeader;
|
||||
|
||||
external_aouthdr aoutHeader;
|
||||
|
||||
in.read((char*) &xcoffHeader, sizeof(xcoffHeader));
|
||||
in.seekg(getI16(xcoffHeader.f_opthdr),std::ios_base::cur);
|
||||
assert((size_t)getI16(xcoffHeader.f_opthdr) >= sizeof(aoutHeader));
|
||||
in.read((char*)&aoutHeader, sizeof(aoutHeader));
|
||||
in.seekg(getI16(xcoffHeader.f_opthdr) - sizeof(aoutHeader),std::ios_base::cur);
|
||||
|
||||
if(verboseFlag)
|
||||
std::cerr << "flags: " << std::hex << getI16(xcoffHeader.f_flags) << std::dec << std::endl;
|
||||
@ -184,11 +190,22 @@ void mkpef(std::istream& in, std::ostream& out, std::string mainSymbol = "__star
|
||||
xcoffSectionNames[i+1] = xcoffSection.s_name;
|
||||
}
|
||||
|
||||
PEFLoaderInfoHeader loaderInfoHeader;
|
||||
memset(&loaderInfoHeader, 0, sizeof(loaderInfoHeader));
|
||||
|
||||
loaderInfoHeader.mainSection = -1;
|
||||
loaderInfoHeader.initSection = -1;
|
||||
loaderInfoHeader.termSection = -1;
|
||||
|
||||
loaderInfoHeader.mainSection = 1;
|
||||
loaderInfoHeader.mainOffset = getI32(aoutHeader.entry);
|
||||
|
||||
std::vector<ImportLib> importLibs;
|
||||
std::vector<unsigned short> relocInstructions;
|
||||
std::map<std::string, int> importSources;
|
||||
std::map<std::string, int> importedSymbolIndices;
|
||||
std::map<std::string, int> importedSymbolIndicesByName;
|
||||
std::set<std::string> importedSymbolSet;
|
||||
std::vector<int> importedSymbolIndices;
|
||||
int totalImportedSyms = 0;
|
||||
{
|
||||
external_scnhdr xcoffLoaderSection = xcoffSections[".loader"];
|
||||
@ -239,167 +256,67 @@ void mkpef(std::istream& in, std::ostream& out, std::string mainSymbol = "__star
|
||||
if(verboseFlag)
|
||||
std::cerr << "... from file: " << sym.l_ifile << std::endl;
|
||||
importLibs[sym.l_ifile].imports.push_back(name);
|
||||
importLibs[sym.l_ifile].xcoffImportIndices.push_back(i);
|
||||
importSources[name] = totalImportedSyms;
|
||||
importedSymbolSet.insert(name);
|
||||
totalImportedSyms++;
|
||||
}
|
||||
}
|
||||
importedSymbolIndices.resize(xcoffLoaderHeader.l_nsyms);
|
||||
{
|
||||
int symbolIndex = 0;
|
||||
for(unsigned i=1;i<importLibs.size();i++)
|
||||
{
|
||||
for(unsigned j=0;j<importLibs[i].imports.size();j++)
|
||||
{
|
||||
importedSymbolIndices[importLibs[i].imports[j]] = symbolIndex++;
|
||||
importedSymbolIndicesByName[importLibs[i].imports[j]] = symbolIndex;
|
||||
importedSymbolIndices[importLibs[i].xcoffImportIndices[j]] = symbolIndex;
|
||||
symbolIndex++;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
PEFLoaderInfoHeader loaderInfoHeader;
|
||||
memset(&loaderInfoHeader, 0, sizeof(loaderInfoHeader));
|
||||
|
||||
loaderInfoHeader.mainSection = -1;
|
||||
loaderInfoHeader.initSection = -1;
|
||||
loaderInfoHeader.termSection = -1;
|
||||
|
||||
{
|
||||
int xcoffDataSecNumber = xcoffSectionNumbers[".data"];
|
||||
|
||||
in.seekg(getI32(xcoffHeader.f_symptr) +
|
||||
getI32(xcoffHeader.f_nsyms) * sizeof(external_syment));
|
||||
int stringTableLen = 0;
|
||||
|
||||
if(verboseFlag)
|
||||
std::cerr << "tell: " << in.tellg() << std::endl;
|
||||
in.read((char*)&stringTableLen, 4);
|
||||
eswap(&stringTableLen, "L");
|
||||
|
||||
if(verboseFlag)
|
||||
std::cerr << "string table len: " << stringTableLen << std::endl;
|
||||
char *stringTable = new char[stringTableLen+1];
|
||||
if(stringTableLen != 0)
|
||||
internal_ldrel *rels = (internal_ldrel*) (loaderSectionPtr + 32 + xcoffLoaderHeader.l_nsyms * sizeof(internal_ldsym));
|
||||
for(unsigned i=0; i<xcoffLoaderHeader.l_nreloc; i++)
|
||||
{
|
||||
*(int*)stringTable = stringTableLen;
|
||||
if(stringTableLen > 4)
|
||||
in.read(stringTable+4, stringTableLen-5);
|
||||
stringTable[stringTableLen-1] = 0;
|
||||
}
|
||||
|
||||
if(verboseFlag)
|
||||
{
|
||||
std::cerr << "tell: " << in.tellg() << std::endl;
|
||||
std::cerr << "seeking to symptr: " << getI32(xcoffHeader.f_symptr) << std::endl;
|
||||
}
|
||||
in.seekg(getI32(xcoffHeader.f_symptr),std::ios::beg);
|
||||
|
||||
if(verboseFlag)
|
||||
std::cerr << "tell: " << in.tellg() << std::endl;
|
||||
|
||||
int nSymEntries = getI32(xcoffHeader.f_nsyms);
|
||||
std::vector<external_syment> syms(nSymEntries);
|
||||
in.read((char*) &syms[0], sizeof(external_syment)*nSymEntries);
|
||||
|
||||
std::vector<std::string> symNames;
|
||||
|
||||
for(int i=0; i < nSymEntries; i++)
|
||||
{
|
||||
external_syment ent = syms[i];
|
||||
|
||||
std::string name;
|
||||
if(getI32(ent.e.e.e_zeroes) == 0)
|
||||
internal_ldrel rel = rels[i];
|
||||
eswap(&rel, "LLss");
|
||||
/*
|
||||
bfd_vma l_vaddr;
|
||||
bfd_size_type l_symndx;
|
||||
short l_rtype;
|
||||
short l_rsecnm;
|
||||
*/
|
||||
if(verboseFlag)
|
||||
{
|
||||
if(getI16(ent.e_scnum) == -2)
|
||||
name = "#debug#";
|
||||
else
|
||||
name = stringTable + getI32(ent.e.e.e_offset);
|
||||
|
||||
std::cerr << "reloc: " << std::hex << rel.l_vaddr << " " << rel.l_symndx << " " << rel.l_rtype << " " << rel.l_rsecnm << "\n";
|
||||
}
|
||||
assert(rel.l_rtype == 0x1f00);
|
||||
assert(rel.l_rsecnm == xcoffDataSecNumber);
|
||||
|
||||
int vaddr = rel.l_vaddr;
|
||||
|
||||
relocInstructions.push_back(
|
||||
PEFRelocComposeSetPosition_1st(vaddr));
|
||||
relocInstructions.push_back(
|
||||
PEFRelocComposeSetPosition_2nd(vaddr));
|
||||
if(rel.l_symndx == 0)
|
||||
relocInstructions.push_back(PEFRelocComposeBySectC(1));
|
||||
else if(rel.l_symndx == 1 || rel.l_symndx == 2)
|
||||
relocInstructions.push_back(PEFRelocComposeBySectD(1));
|
||||
else
|
||||
name = ent.e.e_name;
|
||||
if(verboseFlag)
|
||||
{
|
||||
std::cerr << "[" << i << "] Symbol: " << name << std::hex
|
||||
<< " e_value: " << getI32(ent.e_value)
|
||||
<< " e_scnum: " << getI16(ent.e_scnum)
|
||||
<< " e_type: " << getI16(ent.e_type)
|
||||
<< " e_sclass: " << (int)ent.e_sclass[0]
|
||||
<< std::dec << std::endl;
|
||||
}
|
||||
symNames.push_back(name);
|
||||
for(int j=0; j<ent.e_numaux[0]; j++)
|
||||
{
|
||||
i++;
|
||||
symNames.push_back("#aux#");
|
||||
}
|
||||
|
||||
if(getI16(ent.e_scnum) != 0)
|
||||
{
|
||||
if(name == mainSymbol)
|
||||
{
|
||||
std::string secName = xcoffSectionNames[getI16(ent.e_scnum)];
|
||||
loaderInfoHeader.mainSection = pefSectionNumbers[secName];
|
||||
loaderInfoHeader.mainOffset = getI32(ent.e_value) - getI32(xcoffSections[secName].s_vaddr);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
delete[] stringTable;
|
||||
|
||||
{
|
||||
external_scnhdr xcoffDataSection = xcoffSections[".data"];
|
||||
in.seekg(getI32(xcoffDataSection.s_relptr));
|
||||
|
||||
int nRelocs = getI16(xcoffDataSection.s_nreloc);
|
||||
external_reloc *relocs = new external_reloc[nRelocs];
|
||||
in.read((char*) relocs,sizeof(external_reloc)*nRelocs);
|
||||
|
||||
if(verboseFlag)
|
||||
std::cerr << nRelocs << " relocs\n";
|
||||
for(int i=0;i<nRelocs;i++)
|
||||
{
|
||||
if(verboseFlag)
|
||||
{
|
||||
std::cerr << "reloc " << std::hex << getI32(relocs[i].r_vaddr)
|
||||
<< " " << getI32(relocs[i].r_symndx)
|
||||
<< " " << getI16(relocs[i].r_type)
|
||||
<< std::dec << std::endl;
|
||||
}
|
||||
assert(getI16(relocs[i].r_type) == 0x1f00);
|
||||
int vaddr = getI32(relocs[i].r_vaddr);
|
||||
|
||||
int importIndex = importedSymbolIndices[rel.l_symndx - 3];
|
||||
relocInstructions.push_back(
|
||||
PEFRelocComposeSetPosition_1st(vaddr));
|
||||
PEFRelocComposeLgByImport_1st(importIndex));
|
||||
relocInstructions.push_back(
|
||||
PEFRelocComposeSetPosition_2nd(vaddr));
|
||||
|
||||
int symndx = getI32(relocs[i].r_symndx);
|
||||
if(importedSymbolSet.count(symNames[symndx]))
|
||||
{
|
||||
//int importIndex = importSources[symNames[symndx]];
|
||||
int importIndex = importedSymbolIndices[symNames[symndx]];
|
||||
assert(importIndex != -1);
|
||||
relocInstructions.push_back(
|
||||
PEFRelocComposeLgByImport_1st(importIndex));
|
||||
relocInstructions.push_back(
|
||||
PEFRelocComposeLgByImport_2nd(importIndex));
|
||||
}
|
||||
else if(getI16(syms[symndx].e_scnum) == xcoffSectionNumbers[".text"])
|
||||
relocInstructions.push_back(PEFRelocComposeBySectC(1));
|
||||
else if(getI16(syms[symndx].e_scnum) == xcoffSectionNumbers[".data"])
|
||||
relocInstructions.push_back(PEFRelocComposeBySectD(1));
|
||||
else if(getI16(syms[symndx].e_scnum) == xcoffSectionNumbers[".bss"])
|
||||
relocInstructions.push_back(PEFRelocComposeBySectD(1));
|
||||
else
|
||||
{
|
||||
//assert(false);
|
||||
std::cerr << "RELOC for section " << getI16(syms[symndx].e_scnum) << std::endl;
|
||||
}
|
||||
PEFRelocComposeLgByImport_2nd(importIndex));
|
||||
}
|
||||
delete[] relocs;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
PEFSectionHeader textSectionHeader, dataSectionHeader, loaderSectionHeader;
|
||||
memset(&textSectionHeader, 0, sizeof(textSectionHeader));
|
||||
memset(&dataSectionHeader, 0, sizeof(dataSectionHeader));
|
||||
@ -532,6 +449,7 @@ void mkpef(std::istream& in, std::ostream& out, std::string mainSymbol = "__star
|
||||
loaderSectionHeader.shareKind = kPEFGlobalShare;
|
||||
loaderSectionHeader.alignment = 2;
|
||||
|
||||
std::ofstream out(outFn);
|
||||
if(verboseFlag)
|
||||
std::cerr << "Writing Headers..." << std::flush;
|
||||
|
||||
@ -676,9 +594,7 @@ int main (int argc, char * const argv[]) {
|
||||
std::cerr << "makepef: no output file specified.\n";
|
||||
return 1;
|
||||
}
|
||||
std::ifstream in(inputFn.c_str());
|
||||
std::ofstream out(outputFn.c_str());
|
||||
mkpef(in, out);
|
||||
mkpef(inputFn, outputFn);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user