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Fix R_PPC_REL24 relocations

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Maschell 2021-09-18 12:06:32 +02:00
parent d558d7846e
commit c225cc7f25
2 changed files with 17 additions and 26 deletions
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27
src/ElfUtils.cpp
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@ -1,5 +1,5 @@
/**************************************************************************** /****************************************************************************
* Copyright (C) 2018-2020 Maschell * Copyright (C) 2018-2021 Maschell
* *
* This program is free software: you can redistribute it and/or modify * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by * it under the terms of the GNU General Public License as published by
@ -15,18 +15,10 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>. * along with this program. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/ ****************************************************************************/
#include <stdio.h> #include <cstring>
#include <string.h>
#include <coreinit/debug.h>
#include <coreinit/cache.h> #include <coreinit/cache.h>
#include <coreinit/memdefaultheap.h>
#include <whb/sdcard.h>
#include <whb/file.h>
#include <whb/log.h> #include <whb/log.h>
#include "utils/logger.h" #include "utils/logger.h"
#include "elfio/elfio.hpp"
#include "ElfUtils.h" #include "ElfUtils.h"
// See https://github.com/decaf-emu/decaf-emu/blob/43366a34e7b55ab9d19b2444aeb0ccd46ac77dea/src/libdecaf/src/cafe/loader/cafe_loader_reloc.cpp#L144 // See https://github.com/decaf-emu/decaf-emu/blob/43366a34e7b55ab9d19b2444aeb0ccd46ac77dea/src/libdecaf/src/cafe/loader/cafe_loader_reloc.cpp#L144
@ -99,12 +91,12 @@ bool ElfUtils::elfLinkOne(char type, size_t offset, int32_t addend, uint32_t des
// } // }
auto distance = static_cast<int32_t>(value) - static_cast<int32_t>(target); auto distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
if (distance > 0x1FFFFFC || distance < -0x1FFFFFC) { if (distance > 0x1FFFFFC || distance < -0x1FFFFFC) {
if (trampolin_data == NULL) { if (trampolin_data == nullptr) {
DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampolin isn't provided"); DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampolin isn't provided");
DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X", value, target, distance); DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X", value, target, distance);
return false; return false;
} else { } else {
relocation_trampolin_entry_t *freeSlot = NULL; relocation_trampolin_entry_t *freeSlot = nullptr;
for (uint32_t i = 0; i < trampolin_data_length; i++) { for (uint32_t i = 0; i < trampolin_data_length; i++) {
// We want to override "old" relocations of imports // We want to override "old" relocations of imports
// Pending relocations have the status RELOC_TRAMP_IMPORT_IN_PROGRESS. // Pending relocations have the status RELOC_TRAMP_IMPORT_IN_PROGRESS.
@ -118,14 +110,14 @@ bool ElfUtils::elfLinkOne(char type, size_t offset, int32_t addend, uint32_t des
break; break;
} }
} }
if (freeSlot != NULL) { if (freeSlot == nullptr) {
DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampolin data list is full"); DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampolin data list is full");
DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X", value, target, distance); DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X", value, target, target - (uint32_t) &(freeSlot->trampolin[0]));
return false; return false;
} }
if (target - (uint32_t) &(freeSlot->trampolin[0]) > 0x1FFFFFC) { if (target - (uint32_t) &(freeSlot->trampolin[0]) > 0x1FFFFFC) {
DEBUG_FUNCTION_LINE("**Cannot link 24-bit jump (too far to tramp buffer)."); DEBUG_FUNCTION_LINE("**Cannot link 24-bit jump (too far to tramp buffer).");
DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X", value, target, distance); DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X", value, target, (target - (uint32_t) &(freeSlot->trampolin[0])));
return false; return false;
} }
@ -140,12 +132,11 @@ bool ElfUtils::elfLinkOne(char type, size_t offset, int32_t addend, uint32_t des
freeSlot->status = RELOC_TRAMP_FIXED; freeSlot->status = RELOC_TRAMP_FIXED;
} else { } else {
// Relocations for the imports may be overridden // Relocations for the imports may be overridden
freeSlot->status = RELOC_TRAMP_IMPORT_IN_PROGRESS; freeSlot->status = RELOC_TRAMP_IMPORT_DONE;
} }
uint32_t symbolValue = (uint32_t) &(freeSlot->trampolin[0]); auto symbolValue = (uint32_t) &(freeSlot->trampolin[0]);
value = symbolValue + addend; value = symbolValue + addend;
distance = static_cast<int32_t>(value) - static_cast<int32_t>(target); distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
DEBUG_FUNCTION_LINE("Created tramp");
} }
} }

16
src/common/relocation_defines.h
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@ -16,21 +16,21 @@
****************************************************************************/ ****************************************************************************/
#pragma once #pragma once
#include <stdint.h> #include <cstdint>
typedef enum RelocationTrampolinStatus{ typedef enum RelocationTrampolinStatus{
RELOC_TRAMP_FREE = 0, RELOC_TRAMP_FREE = 0,
RELOC_TRAMP_FIXED = 1, RELOC_TRAMP_FIXED = 1,
RELOC_TRAMP_IMPORT_IN_PROGRESS = 2, RELOC_TRAMP_IMPORT_IN_PROGRESS = 2,
RELOC_TRAMP_IMPORT_DONE = 3, RELOC_TRAMP_IMPORT_DONE = 3,
} RelocationTrampolinStatus; } RelocationTrampolinStatus;
typedef enum RelocationType{ typedef enum RelocationType{
RELOC_TYPE_FIXED = 0, RELOC_TYPE_FIXED = 0,
RELOC_TYPE_IMPORT = 1 RELOC_TYPE_IMPORT = 1
} RelocationType; } RelocationType;
typedef struct relocation_trampolin_entry_t { typedef struct relocation_trampolin_entry_t {
uint32_t trampolin[4]; uint32_t trampolin[4];
RelocationTrampolinStatus status = RELOC_TRAMP_FREE; RelocationTrampolinStatus status;
} relocation_trampolin_entry_t; } relocation_trampolin_entry_t;