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load far model code resources

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This commit is contained in:
Kelvin Sherlock 2013-08-04 14:35:05 -04:00
parent 061c025e02
commit 980a21d510
1 changed files with 56 additions and 12 deletions
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68
bin/loader.cpp
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@ -140,7 +140,22 @@ uint32_t load(const char *file)
uint32_t returnAddress = 0; uint32_t returnAddress = 0;
std::vector< std::pair<uint32_t, uint32_t> > segments; // segment, address struct SegInfo {
public:
SegInfo()
{}
SegInfo(uint32_t a, uint32_t s, bool f) :
address(a), size(s), farModel(f)
{}
uint32_t address = 0;
uint32_t size = 0;
bool farModel = 0;
};
std::vector< SegInfo> segments;
uint32_t a5 = 0; uint32_t a5 = 0;
@ -151,6 +166,8 @@ uint32_t load(const char *file)
// todo -- call RM::Native to open and load the Resource File. // todo -- call RM::Native to open and load the Resource File.
assert(FSPathMakeRef( (const UInt8 *)file, &ref, NULL) == noErr); assert(FSPathMakeRef( (const UInt8 *)file, &ref, NULL) == noErr);
// todo -- if it wasn't a resource file, this will fail
// should provide a nicer error message.
refNum = FSOpenResFile(&ref, fsRdPerm); refNum = FSOpenResFile(&ref, fsRdPerm);
assert(refNum != -1 ); assert(refNum != -1 );
@ -209,7 +226,7 @@ uint32_t load(const char *file)
a5 = address + below; a5 = address + below;
std::memcpy(memoryPointer(a5 + jtOffset), data + 16 , jtSize); std::memcpy(memoryPointer(a5 + jtOffset), data + 16 , jtSize);
segments[resID] = std::make_pair(address, a5size); segments[resID] = SegInfo(address, a5size, false);
jtStart = a5 + jtOffset; jtStart = a5 + jtOffset;
jtEnd = jtStart + jtSize; jtEnd = jtStart + jtSize;
@ -224,6 +241,9 @@ uint32_t load(const char *file)
} }
else else
{ {
bool farModel = false;
if (data[0] == 0xff && data[1] == 0xff) farModel = true;
error = MM::Native::NewPtr(size, false, address); error = MM::Native::NewPtr(size, false, address);
if (error) if (error)
{ {
@ -233,7 +253,7 @@ uint32_t load(const char *file)
std::memcpy(memoryPointer(address), data, size); std::memcpy(memoryPointer(address), data, size);
segments[resID] = std::make_pair(address, size); segments[resID] = SegInfo(address, size, farModel);
} }
ReleaseResource(h); ReleaseResource(h);
@ -243,22 +263,46 @@ uint32_t load(const char *file)
assert(a5); assert(a5);
bool first = true; bool first = true;
bool farModel = false;
for (; jtStart < jtEnd; jtStart += 8) for (; jtStart < jtEnd; jtStart += 8)
{ {
uint16_t offset = memoryReadWord(jtStart); uint16_t seg;
uint16_t seg = memoryReadWord(jtStart + 4); uint32_t offset;
if (farModel)
{
seg = memoryReadWord(jtStart + 0);
offset = memoryReadLong(jtStart + 4);
assert(memoryReadWord(jtStart + 2) == 0x3F3C); assert(memoryReadWord(jtStart + 2) == 0xA9F0);
assert(memoryReadWord(jtStart + 6) == 0xA9F0); }
else
{
uint16_t farModelCheck;
offset = memoryReadWord(jtStart);
farModelCheck = memoryReadWord(jtStart + 2);
seg = memoryReadWord(jtStart + 4);
assert(seg < segments.size()); if (farModelCheck == 0xffff)
{
farModel = true;
continue;
}
assert(memoryReadWord(jtStart + 2) == 0x3F3C);
assert(memoryReadWord(jtStart + 6) == 0xA9F0);
}
assert(seg < segments.size());
auto p = segments[seg]; auto p = segments[seg];
assert(p.first); // missing segment?! //assert(p.first); // missing segment?!
assert(offset < p.second); //assert(offset < p.second);
// +4 for the jump table info header. assert(p.address); // missing segment?!
uint32_t address = p.first + offset + 4; assert(offset < p.size);
// +$4/$28 for the jump table info header.
uint32_t address = p.address + offset + (p.farModel ? 0x28 : 0x04);
// JMP absolute long // JMP absolute long
memoryWriteWord(0x4EF9, jtStart + 2); memoryWriteWord(0x4EF9, jtStart + 2);