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Fix elfLinkOne to support tramps in both directions

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Maschell 2022-05-13 00:04:50 +02:00
parent 1bfa7046a5
commit 5a8c16b6d7
1 changed files with 29 additions and 23 deletions
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52
source/main.cpp
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@ -3,6 +3,7 @@
#include "logger.h"
#include <coreinit/cache.h>
#include <coreinit/debug.h>
#include <cstdlib>
#include <cstring>
#include <memory/mappedmemory.h>
@ -72,10 +73,11 @@ WUMS_RELOCATIONS_DONE(args) {
// See https://github.com/decaf-emu/decaf-emu/blob/43366a34e7b55ab9d19b2444aeb0ccd46ac77dea/src/libdecaf/src/cafe/loader/cafe_loader_reloc.cpp#L144
bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination, uint32_t symbol_addr, relocation_trampoline_entry_t *trampoline_data, uint32_t trampoline_data_length,
RelocationType reloc_type) {
RelocationType reloc_type) {
if (type == R_PPC_NONE) {
return true;
}
auto target = destination + offset;
auto value = symbol_addr + addend;
@ -97,7 +99,7 @@ bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination,
*((uint16_t *) (target)) = static_cast<uint16_t>((value + 0x8000) >> 16);
break;
case R_PPC_DTPMOD32:
DEBUG_FUNCTION_LINE("################IMPLEMENT ME\n");
DEBUG_FUNCTION_LINE_ERR("################IMPLEMENT ME");
//*((int32_t *)(target)) = tlsModuleIndex;
break;
case R_PPC_DTPREL32:
@ -115,18 +117,18 @@ bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination,
case R_PPC_REL14: {
auto distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
if (distance > 0x7FFC || distance < -0x7FFC) {
DEBUG_FUNCTION_LINE("***14-bit relative branch cannot hit target.");
DEBUG_FUNCTION_LINE_ERR("***14-bit relative branch cannot hit target.");
return false;
}
if (distance & 3) {
DEBUG_FUNCTION_LINE("***RELOC ERROR %d: lower 2 bits must be zero before shifting.", -470040);
DEBUG_FUNCTION_LINE_ERR("***RELOC ERROR %d: lower 2 bits must be zero before shifting.", -470040);
return false;
}
if ((distance >= 0 && (distance & 0xFFFF8000)) ||
(distance < 0 && ((distance & 0xFFFF8000) != 0xFFFF8000))) {
DEBUG_FUNCTION_LINE("***RELOC ERROR %d: upper 17 bits before shift must all be the same.", -470040);
DEBUG_FUNCTION_LINE_ERR("***RELOC ERROR %d: upper 17 bits before shift must all be the same.", -470040);
return false;
}
@ -141,8 +143,8 @@ bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination,
auto distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
if (distance > 0x1FFFFFC || distance < -0x1FFFFFC) {
if (trampoline_data == nullptr) {
DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampoline isn't provided\n");
DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X\n", value, target, distance);
DEBUG_FUNCTION_LINE_ERR("***24-bit relative branch cannot hit target. Trampoline isn't provided");
DEBUG_FUNCTION_LINE_ERR("***value %08X - target %08X = distance %08X", value, target, distance);
return false;
} else {
relocation_trampoline_entry_t *freeSlot = nullptr;
@ -160,13 +162,20 @@ bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination,
}
}
if (freeSlot == nullptr) {
DEBUG_FUNCTION_LINE("***24-bit relative branch cannot hit target. Trampoline data list is full\n");
DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X\n", value, target, distance);
DEBUG_FUNCTION_LINE_ERR("***24-bit relative branch cannot hit target. Trampoline data list is full");
DEBUG_FUNCTION_LINE_ERR("***value %08X - target %08X = distance %08X", value, target, target - (uint32_t) & (freeSlot->trampoline[0]));
return false;
}
if (target - (uint32_t) & (freeSlot->trampoline[0]) > 0x1FFFFFC) {
DEBUG_FUNCTION_LINE("**Cannot link 24-bit jump (too far to tramp buffer).");
DEBUG_FUNCTION_LINE("***value %08X - target %08X = distance %08X\n", value, target, distance);
auto symbolValue = (uint32_t) & (freeSlot->trampoline[0]);
auto newValue = symbolValue + addend;
auto newDistance = static_cast<int32_t>(newValue) - static_cast<int32_t>(target);
if (newDistance > 0x1FFFFFC || newDistance < -0x1FFFFFC) {
DEBUG_FUNCTION_LINE_ERR("**Cannot link 24-bit jump (too far to tramp buffer).");
if (newDistance < 0) {
DEBUG_FUNCTION_LINE_ERR("***value %08X - target %08X = distance -%08X", newValue, target, abs(newDistance));
} else {
DEBUG_FUNCTION_LINE_ERR("***value %08X - target %08X = distance %08X", newValue, target, newDistance);
}
return false;
}
@ -181,27 +190,24 @@ bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination,
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->trampoline[0]);
value = symbolValue + addend;
distance = static_cast<int32_t>(value) - static_cast<int32_t>(target);
DEBUG_FUNCTION_LINE("Created tramp\n");
distance = newDistance;
}
}
if (distance & 3) {
DEBUG_FUNCTION_LINE("***RELOC ERROR %d: lower 2 bits must be zero before shifting.", -470022);
DEBUG_FUNCTION_LINE_ERR("***RELOC ERROR %d: lower 2 bits must be zero before shifting.", -470022);
return false;
}
if (distance < 0 && (distance & 0xFE000000) != 0xFE000000) {
DEBUG_FUNCTION_LINE("***RELOC ERROR %d: upper 7 bits before shift must all be the same (1).", -470040);
DEBUG_FUNCTION_LINE_ERR("***RELOC ERROR %d: upper 7 bits before shift must all be the same (1).", -470040);
return false;
}
if (distance >= 0 && (distance & 0xFE000000)) {
DEBUG_FUNCTION_LINE("***RELOC ERROR %d: upper 7 bits before shift must all be the same (0).", -470040);
DEBUG_FUNCTION_LINE_ERR("***RELOC ERROR %d: upper 7 bits before shift must all be the same (0).", -470040);
return false;
}
@ -209,10 +215,10 @@ bool elfLinkOne(char type, size_t offset, int32_t addend, uint32_t destination,
break;
}
default:
DEBUG_FUNCTION_LINE("***ERROR: Unsupported Relocation_Add Type (%08X):", type);
DEBUG_FUNCTION_LINE_ERR("***ERROR: Unsupported Relocation_Add Type (%08X):", type);
return false;
}
DCFlushRange((void *) target, 4);
ICInvalidateRange((void *) target, 4);
ICInvalidateRange(reinterpret_cast<void *>(target), 4);
DCFlushRange(reinterpret_cast<void *>(target), 4);
return true;
}