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Retro68
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implement UnloadSeg on 68K

This commit is contained in:
Wolfgang Thaller 2017-10-07 02:02:42 +02:00
parent 28779ec31e
commit 24bee35d90
1 changed files with 56 additions and 11 deletions
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67
libretro/MultiSegApp.c
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@ -58,6 +58,13 @@ pascal void* Retro68LoadSegment(uint8_t *p)
short id = jtEntry->far.id;
uint32_t offset = jtEntry->far.offset;
/*{
char buf[256];
sprintf(buf+1, "Loading seg %d.;g", id);
buf[0] = strlen(buf+1);
DebugStr((unsigned char*) buf);
}*/
// TODO: UseResFile?
Handle CODE = GetResource('CODE', id);
HLock(CODE);
@ -65,8 +72,7 @@ pascal void* Retro68LoadSegment(uint8_t *p)
uint8_t *base = StripAddressCompat((uint8_t *)*CODE);
CODEHeader *header = (CODEHeader*) base;
uint32_t codeSize = GetHandleSize(CODE);
// TODO: StripAddress24
uint8_t * a5 = (uint8_t*) StripAddressCompat((void*)SetCurrentA5());
if(header->loadAddress != base || header->currentA5 != a5)
@ -74,21 +80,19 @@ pascal void* Retro68LoadSegment(uint8_t *p)
long displacements[4] = {
base - header->loadAddress, // code
a5 - header->currentA5,
a5 - header->currentA5,
a5 - header->currentA5,
a5 - header->currentA5
};
header->loadAddress = base;
header->currentA5 = a5;
Handle RELA = NULL;
RELA = GetResource('RELA', id);
assert(RELA);
Retro68ApplyRelocations(base + 40, codeSize, *RELA, displacements);
Retro68ApplyRelocations(base + 40, codeSize, *RELA, displacements);
HPurge(RELA);
}
else
DebugStr("\prelocation unnecessary???");
/* Update JT Entries */
// FIXME: hardcoded JT offset, there is a LM global for this somewhere:
@ -117,9 +121,50 @@ pascal void* Retro68LoadSegment(uint8_t *p)
return base + offset;
}
static pascal void PatchedUnloadSeg(void *ptr)
static pascal void PatchedUnloadSeg(Ptr ptr)
{
union JTEntry *jtEntry = (JTEntry*) (ptr - 2);
if(jtEntry->jmp.jmp != 0x4EF9)
return; // not loaded or invalid pointer.
int id = jtEntry->jmp.id;
Handle CODE = GetResource('CODE', id);
uint8_t *base = StripAddressCompat((uint8_t *)*CODE);
CODEHeader *header = (CODEHeader*) base;
uint32_t codeSize = GetHandleSize(CODE);
// TODO: check header->magic, pass on to original UnloadSeg?
/* Load Exception Information */
if (__register_frame_info)
{
int32_t offset = ((int32_t*) (base + codeSize))[-1];
void *eh_frame_info = base + codeSize - 4 + offset;
__deregister_frame_info(eh_frame_info);
}
uint8_t * a5 = (uint8_t*) StripAddressCompat((void*)SetCurrentA5());
// FIXME: hardcoded JT offset, there is a LM global for this somewhere:
jtEntry = (JTEntry*) (a5 + 32 + header->farEntryOffset);
int n = header->nFarEntries;
while(n--)
{
if(jtEntry->jmp.jmp == 0x4EF9 && jtEntry->jmp.id == id)
{
uint32_t offset = (uint8_t*) jtEntry->jmp.addr - base;
jtEntry->far.loadseg = _LoadSeg;
jtEntry->far.offset = offset;
}
++jtEntry;
}
if(relocState.hasFlushCodeCache)
FlushCodeCache();
HUnlock(CODE);
HPurge(CODE);
}
static pascal void PatchedExitToShell()
{
@ -179,5 +224,5 @@ void Retro68InitMultisegApp()
RELA = GetResource('RELA', 0);
assert(RELA);
Retro68ApplyRelocations(&_sdata, &_edata - &_sdata, *RELA, displacements);
ReleaseResource(RELA);
}