mirror of
https://github.com/wiiu-env/PatchMemoryRelocationsModule.git
synced 2024-11-14 22:15:11 +01:00
218 lines
10 KiB
C++
218 lines
10 KiB
C++
#include <wums.h>
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#include <whb/log_udp.h>
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#include <coreinit/debug.h>
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#include <cstring>
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#include <coreinit/cache.h>
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#include <memory/mappedmemory.h>
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#include "logger.h"
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WUMS_MODULE_EXPORT_NAME("homebrew_patchmemoryrelocations");
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WUMS_MODULE_SKIP_ENTRYPOINT();
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WUMS_MODULE_INIT_BEFORE_RELOCATION_DONE_HOOK();
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bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination, uint32_t symbol_addr, relocation_trampolin_entry_t *trampolin_data, uint32_t trampolin_data_length,
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RelocationType reloc_type);
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WUMS_RELOCATIONS_DONE(args) {
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module_information_t *gModuleData = args.module_information;
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if (args.module_information == nullptr) {
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OSFatal("PatchMemoryRelocations: Failed to get gModuleData pointer.");
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}
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if (args.module_information->version != MODULE_INFORMATION_VERSION) {
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OSFatal("PatchMemoryRelocations: The module information struct version does not match.");
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}
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WHBLogUdpInit();
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for (int32_t i = 0; i < gModuleData->number_used_modules; i++) {
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if (strcmp("homebrew_memorymapping", gModuleData->module_data[i].module_export_name) == 0 ||
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strcmp("homebrew_patchmemoryrelocations", gModuleData->module_data[i].module_export_name) == 0) {
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DEBUG_FUNCTION_LINE_VERBOSE("Skip %s", gModuleData->module_data[i].module_export_name);
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continue;
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}
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DEBUG_FUNCTION_LINE_VERBOSE("Patch relocations of %s", gModuleData->module_data[i].module_export_name);
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for (auto &curEntry: gModuleData->module_data[i].linking_entries) {
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if (curEntry.functionEntry == nullptr) {
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continue;
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}
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uint32_t functionAddress = 0;
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if (strncmp("coreinit", curEntry.importEntry->importName, DYN_LINK_IMPORT_NAME_LENGTH) == 0) {
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if (strncmp("MEMAllocFromDefaultHeap", curEntry.functionEntry->functionName, DYN_LINK_FUNCTION_NAME_LENGTH) == 0) {
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functionAddress = (uint32_t) &MEMAllocFromMappedMemory;
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} else if (strncmp("MEMAllocFromDefaultHeapEx", curEntry.functionEntry->functionName, DYN_LINK_FUNCTION_NAME_LENGTH) == 0) {
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functionAddress = (uint32_t) &MEMAllocFromMappedMemoryEx;
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} else if (strncmp("MEMFreeToDefaultHeap", curEntry.functionEntry->functionName, DYN_LINK_FUNCTION_NAME_LENGTH) == 0) {
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functionAddress = (uint32_t) &MEMFreeToMappedMemory;
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}
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if (functionAddress != 0) {
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if (!elfLinkOne(curEntry.type, curEntry.offset, curEntry.addend, (uint32_t) curEntry.destination, functionAddress, nullptr, 0, RELOC_TYPE_IMPORT)) {
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OSFatal("homebrew_patchmemoryrelocations: Relocation failed\n");
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}
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}
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}
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}
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}
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}
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#define R_PPC_NONE 0
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#define R_PPC_ADDR32 1
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#define R_PPC_ADDR16_LO 4
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#define R_PPC_ADDR16_HI 5
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#define R_PPC_ADDR16_HA 6
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#define R_PPC_REL24 10
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#define R_PPC_REL14 11
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#define R_PPC_DTPMOD32 68
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#define R_PPC_DTPREL32 78
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#define R_PPC_GHS_REL16_HA 251
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#define R_PPC_GHS_REL16_HI 252
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#define R_PPC_GHS_REL16_LO 253
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// See https://github.com/decaf-emu/decaf-emu/blob/43366a34e7b55ab9d19b2444aeb0ccd46ac77dea/src/libdecaf/src/cafe/loader/cafe_loader_reloc.cpp#L144
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bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination, uint32_t symbol_addr, relocation_trampolin_entry_t *trampolin_data, uint32_t trampolin_data_length,
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RelocationType reloc_type) {
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if (type == R_PPC_NONE) {
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return true;
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}
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auto target = destination + offset;
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auto value = symbol_addr + addend;
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auto relValue = value - static_cast<uint32_t>(target);
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switch (type) {
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case R_PPC_NONE:
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break;
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case R_PPC_ADDR32:
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*((uint32_t *) (target)) = value;
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break;
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case R_PPC_ADDR16_LO:
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*((uint16_t *) (target)) = static_cast<uint16_t>(value & 0xFFFF);
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break;
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case R_PPC_ADDR16_HI:
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*((uint16_t *) (target)) = static_cast<uint16_t>(value >> 16);
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break;
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case R_PPC_ADDR16_HA:
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*((uint16_t *) (target)) = static_cast<uint16_t>((value + 0x8000) >> 16);
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break;
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case R_PPC_DTPMOD32:
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DEBUG_FUNCTION_LINE("################IMPLEMENT ME\n");
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//*((int32_t *)(target)) = tlsModuleIndex;
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break;
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case R_PPC_DTPREL32:
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*((uint32_t *) (target)) = value;
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break;
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case R_PPC_GHS_REL16_HA:
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*((uint16_t *) (target)) = static_cast<uint16_t>((relValue + 0x8000) >> 16);
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break;
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case R_PPC_GHS_REL16_HI:
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*((uint16_t *) (target)) = static_cast<uint16_t>(relValue >> 16);
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break;
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case R_PPC_GHS_REL16_LO:
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*((uint16_t *) (target)) = static_cast<uint16_t>(relValue & 0xFFFF);
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break;
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case R_PPC_REL14: {
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auto distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
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if (distance > 0x7FFC || distance < -0x7FFC) {
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DEBUG_FUNCTION_LINE("***14-bit relative branch cannot hit target.");
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return false;
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}
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if (distance & 3) {
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DEBUG_FUNCTION_LINE("***RELOC ERROR %d: lower 2 bits must be zero before shifting.", -470040);
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return false;
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}
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if ((distance >= 0 && (distance & 0xFFFF8000)) ||
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(distance < 0 && ((distance & 0xFFFF8000) != 0xFFFF8000))) {
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DEBUG_FUNCTION_LINE("***RELOC ERROR %d: upper 17 bits before shift must all be the same.", -470040);
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return false;
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}
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*(int32_t *) target = (*(int32_t *) target & 0xFFBF0003) | (distance & 0x0000fffc);
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break;
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}
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case R_PPC_REL24: {
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// if (isWeakSymbol && !symbolValue) {
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// symbolValue = static_cast<uint32_t>(target);
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// value = symbolValue + addend;
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// }
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auto distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
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if (distance > 0x1FFFFFC || distance < -0x1FFFFFC) {
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if (trampolin_data == nullptr) {
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DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampoline isn't provided\n");
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DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X\n", value, target, distance);
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return false;
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} else {
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relocation_trampolin_entry_t *freeSlot = nullptr;
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for (uint32_t i = 0; i < trampolin_data_length; i++) {
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// We want to override "old" relocations of imports
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// Pending relocations have the status RELOC_TRAMP_IMPORT_IN_PROGRESS.
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// When all relocations are done successfully, they will be turned into RELOC_TRAMP_IMPORT_DONE
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// so they can be overridden/updated/reused on the next application launch.
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//
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// Relocations that won't change will have the status RELOC_TRAMP_FIXED and are set to free when the module is unloaded.
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if (trampolin_data[i].status == RELOC_TRAMP_FREE ||
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trampolin_data[i].status == RELOC_TRAMP_IMPORT_DONE) {
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freeSlot = &(trampolin_data[i]);
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break;
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}
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}
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if (freeSlot == nullptr) {
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DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampolin data list is full\n");
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DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X\n", value, target, distance);
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return false;
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}
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if (target - (uint32_t) &(freeSlot->trampolin[0]) > 0x1FFFFFC) {
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DEBUG_FUNCTION_LINE("**Cannot link 24-bit jump (too far to tramp buffer).");
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DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X\n", value, target, distance);
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return false;
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}
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freeSlot->trampolin[0] = 0x3D600000 | ((((uint32_t) value) >> 16) & 0x0000FFFF); // lis r11, real_addr@h
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freeSlot->trampolin[1] = 0x616B0000 | (((uint32_t) value) & 0x0000ffff); // ori r11, r11, real_addr@l
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freeSlot->trampolin[2] = 0x7D6903A6; // mtctr r11
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freeSlot->trampolin[3] = 0x4E800420; // bctr
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DCFlushRange((void *) freeSlot->trampolin, sizeof(freeSlot->trampolin));
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ICInvalidateRange((unsigned char *) freeSlot->trampolin, sizeof(freeSlot->trampolin));
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if (reloc_type == RELOC_TYPE_FIXED) {
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freeSlot->status = RELOC_TRAMP_FIXED;
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} else {
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// Relocations for the imports may be overridden
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freeSlot->status = RELOC_TRAMP_IMPORT_IN_PROGRESS;
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}
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uint32_t symbolValue = (uint32_t) &(freeSlot->trampolin[0]);
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value = symbolValue + addend;
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distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
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DEBUG_FUNCTION_LINE("Created tramp\n");
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}
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}
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if (distance & 3) {
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DEBUG_FUNCTION_LINE("***RELOC ERROR %d: lower 2 bits must be zero before shifting.", -470022);
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return false;
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}
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if (distance < 0 && (distance & 0xFE000000) != 0xFE000000) {
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DEBUG_FUNCTION_LINE("***RELOC ERROR %d: upper 7 bits before shift must all be the same (1).", -470040);
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return false;
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}
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if (distance >= 0 && (distance & 0xFE000000)) {
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DEBUG_FUNCTION_LINE("***RELOC ERROR %d: upper 7 bits before shift must all be the same (0).", -470040);
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return false;
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}
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*(int32_t *) target = (*(int32_t *) target & 0xfc000003) | (distance & 0x03fffffc);
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break;
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}
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default:
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DEBUG_FUNCTION_LINE("***ERROR: Unsupported Relocation_Add Type (%08X):", type);
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return false;
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}
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DCFlushRange((void *) target, 4);
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ICInvalidateRange((void *) target, 4);
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return true;
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}
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