ConvertObj: a tool for converting MPW .o files

This commit is contained in:
Wolfgang Thaller 2017-04-15 23:31:17 +02:00
parent 5cfae0a98b
commit fe6f08fd7f
3 changed files with 304 additions and 1 deletions

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@ -57,7 +57,7 @@ configure_file(cmake/intreecarbon.toolchain.cmake.in cmake/intreecarbon.toolchai
add_subdirectory(ResourceFiles)
add_subdirectory(MakeAPPL)
add_subdirectory(Rez)
add_subdirectory(ConvertObj)
add_subdirectory(PEFTools)
endif()

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@ -0,0 +1,9 @@
set(CMAKE_CXX_FLAGS "--std=c++11 -Wall -Werror=return-type -Wno-multichar")
find_package(Boost COMPONENTS filesystem system REQUIRED)
add_executable(ConvertObj ConvertObj.cc)
target_link_libraries(ConvertObj ResourceFiles ${Boost_LIBRARIES})
target_include_directories(ConvertObj PRIVATE ${Boost_INCLUDE_DIR})
install(TARGETS ConvertObj RUNTIME DESTINATION bin)

294
ConvertObj/ConvertObj.cc Normal file
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@ -0,0 +1,294 @@
#include <fstream>
#include <iostream>
#include <unordered_map>
#include <string>
#include "BinaryIO.h"
#include <stdint.h>
#include <vector>
#include <assert.h>
#include <ctype.h>
#include <sstream>
using std::string;
using std::vector;
using std::unordered_map;
enum RecordType {
kPad = 0,
kFirst = 1,
kLast = 2,
kDictionary = 4,
kModule = 5,
kEntryPoint = 6,
kSize = 7,
kContent = 8,
kReference = 9,
kComputedRef = 10
};
struct Reloc
{
int size;
string name1;
string name2;
int write(std::ostream& out, uint8_t *p);
};
int Reloc::write(std::ostream& out, uint8_t *p)
{
assert(size == 2);
out << "\t.short ";
int val = (int)p[0] * 256 + p[1];
out << name1;
if(name2.size())
out << " - " << name2;
if(val > 0)
out << " + " << val;
else if(val < 0)
out << " - " << -val;
if(name2.size() == 0)
out << "-.";
out << std::endl;
return 2;
}
struct Module
{
string name;
string segment;
vector<uint8_t> bytes;
unordered_map<uint32_t, string> labels;
unordered_map<uint32_t, Reloc> relocs;
void write(std::ostream& out);
};
bool isValidIdentifier(const string& s)
{
if(s.empty())
return false;
if(s[0] != '_' && !isalpha(s[0]))
return false;
for(char c : s)
if(c != '_' && !isalnum(c))
return false;
return true;
}
string encodeIdentifier(const string& s)
{
if(isValidIdentifier(s))
return s;
std::ostringstream ss;
if(isdigit(s[0]))
ss << "__z";
for(char c : s)
{
if(c == '_' || isalnum(c))
ss << c;
else
{
ss << "__z" << (int) c << "_";
}
}
return ss.str();
}
void Module::write(std::ostream& out)
{
int offset = 0;
out << "\t.section .text." << encodeIdentifier(name) << ",\"ax\",@progbits\n";
while(offset < bytes.size())
{
auto labelP = labels.find(offset);
if(labelP != labels.end())
{
string label = encodeIdentifier(labelP->second);
out << "\t.globl " << label << "\n";
out << label << ":\n";
}
auto relocP = relocs.find(offset);
if(relocP != relocs.end())
{
offset += relocP->second.write(out, &bytes[offset]);
}
else
{
out << "\t.byte " << (int)bytes[offset] << "\n";
offset++;
}
}
out << "# ######\n\n";
}
int main(int argc, char* argv[])
{
std::ifstream in(argv[1]);
unordered_map<int,string> stringDictionary;
std::unique_ptr<Module> module;
std::cout << "\t.text\n\t.align 2\n";
for(bool endOfObject = false; !endOfObject;) {
std::cerr << std::hex << in.tellg() << ": ";
int recordType = byte(in);
if(!in)
{
std::cerr << "Unexpected End of File\n";
return 1;
}
std::cerr << "Record: " << recordType << std::endl;
switch(recordType)
{
case kPad:
std::cerr << "Pad\n";
break;
case kFirst:
{
int flags = byte(in);
std::cerr << "First\n";
std::cerr << "Version: " << word(in) << std::endl;
}
break;
case kDictionary:
{
int flags = byte(in);
std::cerr << "Dictionary\n";
int sz = word(in);
int stringId = word(in);
int end = (int)(in.tellg()) - 6 + sz;
while(in.tellg() < end)
{
int n = byte(in);
string s;
for(int i = 0; i < n; i++)
s += (char) byte(in);
std::cerr << s << std::endl;
stringDictionary[stringId++] = s;
}
}
break;
case kModule:
{
int flags = byte(in);
string name = stringDictionary[word(in)];
string segment = stringDictionary[word(in)];
std::cerr << "Module " << name << "(" << segment << "), flags = " << flags << "\n";
if(module)
module->write(std::cout);
module.reset(new Module());
module->name = name;
module->labels[0] = name;
}
break;
case kContent:
{
int flags = byte(in);
int sz = word(in);
int end = (int)(in.tellg()) - 4 + sz;
long offset = longword(in);
assert(module.get());
if(module->bytes.size() < offset + sz)
module->bytes.resize(offset + sz);
in.read((char*) &module->bytes[offset], sz-8);
//in.seekg(end);
std::cerr << "Content\n";
}
break;
case kSize:
{
int flags = byte(in);
long size = longword(in);
std::cerr << "Size\n";
assert(module.get());
module->bytes.resize(size);
}
break;
case kReference:
{
int flags = byte(in);
int sz = word(in);
int end = (int)(in.tellg()) - 4 + sz;
string name = stringDictionary[word(in)];
std::cerr << "Reference to " << name << " at\n";
Reloc reloc;
reloc.name1 = name;
reloc.size = 2;
assert(flags == 0x10);
assert(module);
while(in.tellg() < end)
{
int offset = word(in);
std::cerr << " " << offset << std::endl;
module->relocs[offset] = reloc;
}
}
break;
case kEntryPoint:
{
int flags = byte(in);
string name = stringDictionary[word(in)];
long offset = longword(in);
std::cerr << "EntryPoint " << name << " at offset " << offset << "\n";
assert(module);
module->labels[offset] = name;
}
break;
case kComputedRef:
{
int flags = byte(in);
int sz = word(in);
int end = (int)(in.tellg()) - 4 + sz;
string name1 = stringDictionary[word(in)];
string name2 = stringDictionary[word(in)];
Reloc reloc;
reloc.name1 = name1;
reloc.name2 = name2;
reloc.size = 2;
assert(flags == 0x90);
assert(module);
std::cerr << "ComputedReference to " << name1 << " - " << name2 << " at\n";
while(in.tellg() < end)
{
int offset = word(in);
std::cerr << " " << offset << std::endl;
module->relocs[offset] = reloc;
}
}
break;
case kLast:
byte(in);
endOfObject = true;
if(module)
module->write(std::cout);
break;
default:
std::cerr << "Unknown record at " << std::hex << in.tellg() << std::endl;
return 1;
}
}
return 0;
}