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ConvertObj: deal with 32-bit patches. Can now convert OpenTransport.o (see #35)

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This commit is contained in:
Wolfgang Thaller 2017-10-15 12:57:06 +02:00
parent 3ecff9bcc6
commit d7e89e2fd5
1 changed files with 70 additions and 16 deletions
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60
ConvertObj/ConvertObj.cc
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@ -31,6 +31,21 @@ enum RecordType {
kComputedRef = 10
};
enum ReferenceFlags { // flags field of kReference
k16BitPatch = 0x10, // default 32Bit
kFromData = 0x01, // default fromCode
kA5Relative = 0x80, // default absolute
kUnknownReferenceFlags = 0x6E // rather a lot, isn't it?
// The following flags are known to exist from DumpOBJ,
// but their value is unkown as I haven't actually seen them yet:
// k32BitOffsets (default k16BitOffsets)
};
enum ComputedReferenceFlags {
kDifference = 0x80
};
struct Reloc
{
int size;
@ -42,7 +57,8 @@ struct Reloc
int Reloc::write(std::ostream& out, uint8_t *p)
{
assert(size == 2);
if(size == 2)
{
out << "\t.short ";
int val = (int)p[0] * 256 + p[1];
@ -57,6 +73,29 @@ int Reloc::write(std::ostream& out, uint8_t *p)
out << "-.";
out << std::endl;
return 2;
}
else if(size == 4)
{
out << "\t.long ";
int val = ((int)p[0] << 24) | ((int)p[1] << 16) | ((int)p[2] << 8) | p[3];
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 4;
}
else
{
assert(false);
return 1;
}
}
struct Module
@ -346,9 +385,24 @@ int main(int argc, char* argv[])
std::cerr << "Reference to " << name << " at\n";
Reloc reloc;
reloc.name1 = name;
reloc.size = 2;
assert(flags == 0x10);
if(flags & kUnknownReferenceFlags)
{
std::cerr << "Unknown relocation flags: 0x" << std::hex << flags << std::endl;
std::cerr << "Cannot convert this file.\n";
std::exit(1);
}
if(flags & kA5Relative)
{
std::cerr << "Unsupported relocation flags: 0x" << std::hex << flags << std::endl;
std::cerr << "MPW .o files with near-model global variables or calls to imported functions will not work.\n";
std::cerr << "Cannot convert this file.\n";
std::exit(1);
}
flags &= ~kFromData; // FIXME: sticking data bits in the text section, not nice, but might sometimes work
reloc.size = (flags & k16BitPatch ? 2 : 4);
assert(module);
while(in.tellg() < end)