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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
* 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/>.
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <coreinit/debug.h>
#include <cstring>
#include <coreinit/cache.h>
#include <coreinit/memdefaultheap.h>
#include <whb/sdcard.h>
#include <whb/file.h>
#include <whb/log.h>
#include "utils/logger.h"
#include "elfio/elfio.hpp"
#include "ElfUtils.h"
// 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);
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("***value %08X - target %08X = distance %08X", value, target, distance);
return false;
} else {
relocation_trampolin_entry_t *freeSlot = NULL;
relocation_trampolin_entry_t *freeSlot = nullptr;
for (uint32_t i = 0; i < trampolin_data_length; i++) {
// We want to override "old" relocations of imports
// 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;
}
}
if (freeSlot != NULL) {
if (freeSlot == nullptr) {
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;
}
if (target - (uint32_t) &(freeSlot->trampolin[0]) > 0x1FFFFFC) {
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;
}
@ -140,12 +132,11 @@ bool ElfUtils::elfLinkOne(char type, size_t offset, int32_t addend, uint32_t des
freeSlot->status = RELOC_TRAMP_FIXED;
} else {
// 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;
distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
DEBUG_FUNCTION_LINE("Created tramp");
}
}

16
src/common/relocation_defines.h
View File

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