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Load OK (#792)
* Progress * cleanup * Fix comment * progress * OK * Review pt1 * Update comments * update comments some more * Renamings * Add headers and some parens cleanup * Remove zelda64 * PR review * bss * Explain each relocation type a bit in the header comment * Relocate_Addr macro * Split off into z64load.h * Adjust comment slightly based on OOT review * OverlayRelocationType -> MIPSRelocationType * Last bit of cleanup from OoT * format * Split off functions
This commit is contained in:
Derek Hensley
+185
-3
@@ -1,8 +1,190 @@
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/**
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* @file loadfragment.c
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*
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* Functions used to process and relocate overlays
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*
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* @note:
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* These are completly unused in favor of the functions in `loadfragment2.c`.
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*
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* The main difference between them seems to be the lack of vRamEnd arguments here.
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* Instead they are calculated on the fly.
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*/
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#include "global.h"
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#include "system_malloc.h"
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#include "z64load.h"
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#pragma GLOBAL_ASM("asm/non_matchings/boot/loadfragment/Load_Relocate.s")
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s32 gLoadLogSeverity = 2;
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#pragma GLOBAL_ASM("asm/non_matchings/boot/loadfragment/Load_LoadOverlay.s")
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void Load_Relocate(void* allocatedVRamAddr, OverlayRelocationSection* ovl, uintptr_t vRamStart) {
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u32 sections[4];
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u32* relocDataP;
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u32 reloc;
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uintptr_t relocatedAddress;
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u32 i;
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u32* luiInstRef;
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uintptr_t allocu32 = (uintptr_t)allocatedVRamAddr;
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u32* regValP;
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u32* luiRefs[32];
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u32 luiVals[32];
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u32 isLoNeg;
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#pragma GLOBAL_ASM("asm/non_matchings/boot/loadfragment/Load_AllocateAndLoad.s")
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if (gLoadLogSeverity >= 3) {}
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sections[0] = 0;
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sections[1] = allocu32;
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sections[2] = allocu32 + ovl->textSize;
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sections[3] = sections[2] + ovl->dataSize;
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for (i = 0; i < ovl->nRelocations; i++) {
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reloc = ovl->relocations[i];
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relocDataP = (u32*)(sections[RELOC_SECTION(reloc)] + RELOC_OFFSET(reloc));
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switch (RELOC_TYPE_MASK(reloc)) {
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case R_MIPS_32 << RELOC_TYPE_SHIFT:
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// Handles 32-bit address relocation, used for things such as jump tables and pointers in data.
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// Just relocate the full address
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// Check address is valid for relocation
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if ((*relocDataP & 0x0F000000) == 0) {
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*relocDataP = RELOCATE_ADDR(*relocDataP, vRamStart, allocu32);
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} else if (gLoadLogSeverity >= 3) {
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}
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break;
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case R_MIPS_26 << RELOC_TYPE_SHIFT:
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// Handles 26-bit address relocation, used for jumps and jals.
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// Extract the address from the target field of the J-type MIPS instruction.
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// Relocate the address and update the instruction.
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*relocDataP =
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(*relocDataP & 0xFC000000) |
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((RELOCATE_ADDR(PHYS_TO_K0((*relocDataP & 0x03FFFFFF) << 2), vRamStart, allocu32) & 0x0FFFFFFF) >>
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2);
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break;
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case R_MIPS_HI16 << RELOC_TYPE_SHIFT:
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// Handles relocation for a hi/lo pair, part 1.
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// Store the reference to the LUI instruction (hi) using the `rt` register of the instruction.
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// This will be updated later in the `R_MIPS_LO16` section.
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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 R_MIPS_LO16 << RELOC_TYPE_SHIFT:
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// Handles relocation for a hi/lo pair, part 2.
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// Grab the stored LUI (hi) from the `R_MIPS_HI16` section using the `rs` register of the instruction.
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// The full address is calculated, relocated, and then used to update both the LUI and lo instructions.
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// If the lo part is negative, add 1 to the LUI value.
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// Note: The lo instruction is assumed to have a signed immediate.
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luiInstRef = luiRefs[(*relocDataP >> 0x15) & 0x1F];
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regValP = &luiVals[(*relocDataP >> 0x15) & 0x1F];
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// Check address is valid for relocation
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if ((((*luiInstRef << 0x10) + (s16)*relocDataP) & 0x0F000000) == 0) {
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relocatedAddress = RELOCATE_ADDR((*regValP << 0x10) + (s16)*relocDataP, vRamStart, allocu32);
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isLoNeg = (relocatedAddress & 0x8000) ? 1 : 0;
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*luiInstRef = (*luiInstRef & 0xFFFF0000) | (((relocatedAddress >> 0x10) & 0xFFFF) + isLoNeg);
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*relocDataP = (*relocDataP & 0xFFFF0000) | (relocatedAddress & 0xFFFF);
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} else if (gLoadLogSeverity >= 3) {
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}
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break;
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}
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}
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}
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size_t Load_LoadOverlay(uintptr_t vRomStart, uintptr_t vRomEnd, uintptr_t vRamStart, void* allocatedVRamAddr,
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size_t allocatedBytes) {
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size_t size = vRomEnd - vRomStart;
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void* end;
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s32 pad;
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OverlayRelocationSection* ovl;
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if (gLoadLogSeverity >= 3) {}
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if (gLoadLogSeverity >= 3) {}
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end = (uintptr_t)allocatedVRamAddr + size;
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DmaMgr_SendRequest0(allocatedVRamAddr, vRomStart, size);
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ovl = (OverlayRelocationSection*)((uintptr_t)end - ((s32*)end)[-1]);
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if (gLoadLogSeverity >= 3) {}
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if (allocatedBytes < ovl->bssSize + size) {
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if (gLoadLogSeverity >= 3) {}
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return 0;
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}
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allocatedBytes = ovl->bssSize + size;
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if (gLoadLogSeverity >= 3) {}
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Load_Relocate(allocatedVRamAddr, ovl, vRamStart);
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if (ovl->bssSize != 0) {
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if (gLoadLogSeverity >= 3) {}
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bzero(end, ovl->bssSize);
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}
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osWritebackDCache(allocatedVRamAddr, allocatedBytes);
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osInvalICache(allocatedVRamAddr, allocatedBytes);
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if (gLoadLogSeverity >= 3) {}
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return allocatedBytes;
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}
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void* Load_AllocateAndLoad(uintptr_t vRomStart, uintptr_t vRomEnd, uintptr_t vRamStart) {
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size_t size = vRomEnd - vRomStart;
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void* end;
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void* allocatedVRamAddr;
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uintptr_t ovlOffset;
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OverlayRelocationSection* ovl;
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size_t allocatedBytes;
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if (gLoadLogSeverity >= 3) {}
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allocatedVRamAddr = SystemArena_MallocR(size);
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end = (uintptr_t)allocatedVRamAddr + size;
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if (gLoadLogSeverity >= 3) {}
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DmaMgr_SendRequest0(allocatedVRamAddr, vRomStart, size);
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if (gLoadLogSeverity >= 3) {}
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ovlOffset = (uintptr_t)end - 4;
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ovl = (OverlayRelocationSection*)((uintptr_t)end - ((s32*)end)[-1]);
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if (1) {}
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allocatedBytes = ovl->bssSize + size;
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allocatedVRamAddr = SystemArena_Realloc(allocatedVRamAddr, allocatedBytes);
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if (gLoadLogSeverity >= 3) {}
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if (allocatedVRamAddr == NULL) {
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if (gLoadLogSeverity >= 3) {}
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return allocatedVRamAddr;
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}
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end = (uintptr_t)allocatedVRamAddr + size;
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ovl = (OverlayRelocationSection*)((uintptr_t)end - *(uintptr_t*)ovlOffset);
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if (gLoadLogSeverity >= 3) {}
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Load_Relocate(allocatedVRamAddr, ovl, vRamStart);
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if (ovl->bssSize != 0) {
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if (gLoadLogSeverity >= 3) {}
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bzero(end, ovl->bssSize);
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}
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osInvalICache(allocatedVRamAddr, allocatedBytes);
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if (gLoadLogSeverity >= 3) {}
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return allocatedVRamAddr;
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}
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