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#include "global.h"
void Overlay_Relocate(void* allocatedVRamAddress, OverlayRelocationSection* overlayInfo, void* vRamAddress) {
u32 sections[4];
u32 relocatedValue;
u32 dbg;
u32 relocOffset;
u32 relocData;
uintptr_t unrelocatedAddress;
u32 i;
uintptr_t* relocDataP;
u32* luiRefs[32];
u32 luiVals[32];
uintptr_t relocatedAddress;
u32 reloc;
uintptr_t vaddr;
u32* luiInstRef;
uintptr_t allocu32 = (uintptr_t)allocatedVRamAddress;
u32* regValP;
u32 isLoNeg;
relocOffset = 0;
relocatedValue = 0;
unrelocatedAddress = 0;
relocatedAddress = 0;
if (gOverlayLogSeverity >= 3) {
osSyncPrintf("DoRelocation(%08x, %08x, %08x)\n", allocatedVRamAddress, overlayInfo, vRamAddress);
osSyncPrintf("text=%08x, data=%08x, rodata=%08x, bss=%08x\n", overlayInfo->textSize, overlayInfo->dataSize,
overlayInfo->rodataSize, overlayInfo->bssSize);
}
sections[0] = 0;
sections[1] = allocu32;
sections[2] = allocu32 + overlayInfo->textSize;
sections[3] = sections[2] + overlayInfo->dataSize;
for (i = 0; i < overlayInfo->nRelocations; i++) {
reloc = overlayInfo->relocations[i];
relocDataP = (u32*)(sections[reloc >> 0x1E] + (reloc & 0xFFFFFF));
relocData = *relocDataP;
switch (reloc & 0x3F000000) {
case 0x2000000:
/* R_MIPS_32
* Handles 32-bit address relocation. Used in things such as
* jump tables.
*/
if ((*relocDataP & 0xF000000) == 0) {
luiInstRef = vRamAddress;
relocOffset = *relocDataP - (uintptr_t)luiInstRef;
relocatedValue = relocOffset + allocu32;
relocatedAddress = relocatedValue;
unrelocatedAddress = relocData;
*relocDataP = relocatedAddress;
}
break;
case 0x4000000:
/* R_MIPS_26
* Handles 26-bit address relocation, used for jumps and jals
*/
unrelocatedAddress = ((*relocDataP & 0x3FFFFFF) << 2) | 0x80000000;
relocOffset = unrelocatedAddress - (uintptr_t)vRamAddress;
relocatedValue = (*relocDataP & 0xFC000000) | (((allocu32 + relocOffset) & 0xFFFFFFF) >> 2);
relocatedAddress = ((relocatedValue & 0x3FFFFFF) << 2) | 0x80000000;
*relocDataP = relocatedValue;
break;
case 0x5000000:
/* R_MIPS_HI16
* Handles relocation for a lui instruciton, store the reference to
* the instruction, and will update it in the R_MIPS_LO16 section.
*/
luiRefs[(*relocDataP >> 0x10) & 0x1F] = relocDataP;
luiVals[(*relocDataP >> 0x10) & 0x1F] = *relocDataP;
break;
case 0x6000000:
/* R_MIPS_LO16
* Updates the LUI instruction to reflect the relocated address.
* The full address is calculated from the LUI and lo parts, and then updated.
* if the lo part is negative, add 1 to the lui.
*/
regValP = &luiVals[((*relocDataP >> 0x15) & 0x1F)];
vaddr = (*regValP << 0x10) + (s16)*relocDataP;
luiInstRef = luiRefs[((*relocDataP >> 0x15) & 0x1F)];
if ((vaddr & 0xF000000) == 0) {
relocOffset = vaddr - (uintptr_t)vRamAddress;
vaddr = (s16)relocData;
isLoNeg = (((relocOffset + allocu32) & 0x8000) ? 1 : 0);
unrelocatedAddress = (*luiInstRef << 0x10) + vaddr;
*luiInstRef =
(*luiInstRef & 0xFFFF0000) | ((((relocOffset + allocu32) >> 0x10) & 0xFFFF) + isLoNeg);
relocatedValue = (*relocDataP & 0xFFFF0000) | ((relocOffset + allocu32) & 0xFFFF);
relocatedAddress = (*luiInstRef << 0x10) + (s16)relocatedValue;
*relocDataP = relocatedValue;
}
break;
}
dbg = 0x10;
switch (reloc & 0x3F000000) {
case 0x2000000:
dbg = 0x16;
case 0x4000000:
dbg += 0xA;
case 0x6000000:
if (gOverlayLogSeverity >= 3) {
osSyncPrintf("%02d %08x %08x %08x ", dbg, relocDataP, relocatedValue, relocatedAddress);
osSyncPrintf(" %08x %08x %08x %08x\n", ((uintptr_t)relocDataP + (uintptr_t)vRamAddress) - allocu32, relocData,
unrelocatedAddress, relocOffset);
}
}
}
}
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