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