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wheremyfoodat 2023-09-03 10:40:57 +03:00
parent 414e8cf6c8
commit 53917841bc
1 changed files with 45 additions and 53 deletions
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98
src/core/loader/3dsx.cpp
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@ -7,31 +7,29 @@
#include "memory.hpp"
namespace {
struct LoadInfo {
u32 codeSegSizeAligned;
u32 rodataSegSizeAligned;
u32 dataSegSizeAligned;
};
struct LoadInfo {
u32 codeSegSizeAligned;
u32 rodataSegSizeAligned;
u32 dataSegSizeAligned;
};
static inline u32 translateAddr(const u32 off, const u32* addrs, const u32* offsets) {
if (off < offsets[1]) {
return addrs[0] + off;
}
static inline u32 translateAddr(const u32 off, const u32* addrs, const u32* offsets) {
if (off < offsets[1]) {
return addrs[0] + off;
if (off < offsets[2]) {
return addrs[1] + off - offsets[1];
}
return addrs[2] + off - offsets[2];
}
if (off < offsets[2]) {
return addrs[1] + off - offsets[1];
}
return addrs[2] + off - offsets[2];
}
}
} // namespace
bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
const LoadInfo hbInfo = {
.codeSegSizeAligned = (header.codeSegSize+0xFFF) &~ 0xFFF,
.rodataSegSizeAligned = (header.rodataSegSize+0xFFF) &~ 0xFFF,
.dataSegSizeAligned = (header.dataSegSize+0xFFF) &~ 0xFFF,
.codeSegSizeAligned = (header.codeSegSize + 0xFFF) & ~0xFFF,
.rodataSegSizeAligned = (header.rodataSegSize + 0xFFF) & ~0xFFF,
.dataSegSizeAligned = (header.dataSegSize + 0xFFF) & ~0xFFF,
};
const u32 textSegAddr = HB3DSX::entrypoint;
@ -74,7 +72,7 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
return false;
}
const u32 dataLoadsize = header.dataSegSize - header.bssSize; // 3DSX data size in header includes bss
const u32 dataLoadsize = header.dataSegSize - header.bssSize; // 3DSX data size in header includes bss
std::vector<u8> code(totalSize, 0);
std::tie(success, count) = hb3dsx.file.readBytes(&code[textOffset], header.codeSegSize);
@ -90,13 +88,13 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
}
std::tie(success, count) = hb3dsx.file.readBytes(&code[dataOffset], dataLoadsize);
if (!success || count != dataLoadsize) {
if (!success || count != dataLoadsize) {
Helpers::panic("Failed to read 3DSX data segment");
return false;
}
std::vector<HB3DSX::Reloc> currentRelocs;
const u32 segAddrs[] = {
textSegAddr,
rodataSegAddr,
@ -110,7 +108,7 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
dataOffset,
extraPageOffset,
};
const u32 segSizes[] = {
header.codeSegSize,
header.rodataSegSize,
@ -121,7 +119,7 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
for (const auto& relocHeader : relocHeaders) {
currentRelocs.resize(relocHeader.absoluteCount + relocHeader.relativeCount);
std::tie(success, count) = hb3dsx.file.read(&currentRelocs[0], currentRelocs.size(), sizeof(HB3DSX::Reloc));
if (!success || count != currentRelocs.size()) {
if (!success || count != currentRelocs.size()) {
Helpers::panic("Failed to read 3DSX relocations");
return false;
}
@ -136,15 +134,15 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
const auto RelocationAction = [&](const HB3DSX::Reloc& reloc, const HB3DSX::RelocType relocType) -> bool {
if (reloc.skip) {
sectionData = sectionData.subspan(reloc.skip * sizeof(u32)); // advance by `skip` words (32-bit values)
sectionData = sectionData.subspan(reloc.skip * sizeof(u32)); // advance by `skip` words (32-bit values)
}
for (u32 m = 0; m < reloc.patch && !sectionData.empty(); ++m) {
const u32 inAddr = textSegAddr + (sectionData.data() - code.data()); // byte offset -> word count
const u32 inAddr = textSegAddr + (sectionData.data() - code.data()); // byte offset -> word count
u32 origData = 0;
std::memcpy(&origData, &sectionData[0], sizeof(u32));
const u32 subType = origData >> (32-4);
const u32 addr = translateAddr(origData &~ 0xF0000000, segAddrs, segOffs);
const u32 subType = origData >> (32 - 4);
const u32 addr = translateAddr(origData & ~0xF0000000, segAddrs, segOffs);
switch (relocType) {
case HB3DSX::RelocType::Absolute: {
@ -159,14 +157,12 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
case HB3DSX::RelocType::Relative: {
u32 data = addr - inAddr;
switch (subType) {
case 1: // 31-bit signed offset
case 1: // 31-bit signed offset
data &= ~(1u << 31);
case 0: // 32-bit signed offset
case 0: // 32-bit signed offset
std::memcpy(&sectionData[0], &data, sizeof(u32));
break;
default:
Helpers::panic("Unsupported relative reloc subtype");
return false;
default: Helpers::panic("Unsupported relative reloc subtype"); return false;
}
break;
}
@ -184,7 +180,7 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
}
}
sectionData = sectionDataStartAs; // restart from the beginning for the next part
sectionData = sectionDataStartAs; // restart from the beginning for the next part
for (const auto& reloc : relativeRelocs) {
if (!RelocationAction(reloc, HB3DSX::RelocType::Relative)) {
return false;
@ -195,22 +191,22 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
// Detect and fill _prm structure
HB3DSX::PrmStruct pst;
std::memcpy(&pst, &code[4], sizeof(pst));
if (pst.magic[0] == '_' && pst.magic[1] == 'p' && pst.magic[2] == 'r' && pst.magic[3] == 'm' ) {
if (pst.magic[0] == '_' && pst.magic[1] == 'p' && pst.magic[2] == 'r' && pst.magic[3] == 'm') {
// if there was any argv to put, it would go there
// first u32: argc
// remaining: continuous argv string (NUL-char separated, ofc)
// std::memcpy(&code[extraPageOffset], argvBuffer, ...);
// setting to NULL (default) = run from system. load romfs from process.
// non-NULL = homebrew launcher. load romfs from 3dsx @ argv[0]
// pst.pSrvOverride = extraPageAddr + 0xFFC;
pst.pArgList = extraPageAddr;
// RUNFLAG_APTREINIT: Reinitialize APT.
// From libctru. Because there's no previously running software here
pst.runFlags |= 1 << 1;
/* s64 dummy;
bool isN3DS = svcGetSystemInfo(&dummy, 0x10001, 0) == 0;
if (isN3DS)
@ -228,9 +224,9 @@ bool Memory::map3DSX(HB3DSX& hb3dsx, const HB3DSX::Header& header) {
const auto paddr = opt.value();
std::memcpy(&fcram[paddr], &code[0], totalSize); // Copy the 3 segments + BSS to FCRAM
allocateMemory(textSegAddr, paddr + textOffset, hbInfo.codeSegSizeAligned, true, true, false, true); // Text is R-X
allocateMemory(rodataSegAddr, paddr + rodataOffset, hbInfo.rodataSegSizeAligned, true, true, false, false); // Rodata is R--
allocateMemory(dataSegAddr, paddr + dataOffset, hbInfo.dataSegSizeAligned + 0x1000, true, true, true, false); // Data+BSS+Extra is RW-
allocateMemory(textSegAddr, paddr + textOffset, hbInfo.codeSegSizeAligned, true, true, false, true); // Text is R-X
allocateMemory(rodataSegAddr, paddr + rodataOffset, hbInfo.rodataSegSizeAligned, true, true, false, false); // Rodata is R--
allocateMemory(dataSegAddr, paddr + dataOffset, hbInfo.dataSegSizeAligned + 0x1000, true, true, true, false); // Data+BSS+Extra is RW-
return true;
}
@ -262,9 +258,8 @@ std::optional<u32> Memory::load3DSX(const std::filesystem::path& path) {
}
if (hbHeader.headerSize == 0x20 || hbHeader.headerSize == 0x2C) {
if (hbHeader.headerSize == 0x2C)
{
hb3dsx.file.seek(8, SEEK_CUR); // skip SMDH info
if (hbHeader.headerSize == 0x2C) {
hb3dsx.file.seek(8, SEEK_CUR); // skip SMDH info
std::tie(success, bytes) = hb3dsx.file.readBytes(&hb3dsx.romFSOffset, 4);
if (!success || bytes != 4) {
printf("Failed to read 3DSX romFS offset\n");
@ -278,8 +273,7 @@ std::optional<u32> Memory::load3DSX(const std::filesystem::path& path) {
}
hb3dsx.romFSSize = *fileSize - hb3dsx.romFSOffset;
}
}
else {
} else {
printf("Invalid 3DSX header size\n");
return std::nullopt;
}
@ -293,17 +287,15 @@ std::optional<u32> Memory::load3DSX(const std::filesystem::path& path) {
return HB3DSX::entrypoint;
}
bool HB3DSX::hasRomFs() const {
return romFSSize != 0 && romFSOffset != 0;
}
bool HB3DSX::hasRomFs() const { return romFSSize != 0 && romFSOffset != 0; }
std::pair<bool, std::size_t> HB3DSX::readRomFSBytes(void *dst, std::size_t offset, std::size_t size) {
std::pair<bool, std::size_t> HB3DSX::readRomFSBytes(void* dst, std::size_t offset, std::size_t size) {
if (!hasRomFs()) {
return { false, 0 };
return {false, 0};
}
if (!file.seek(romFSOffset + offset)) {
return { false, 0 };
return {false, 0};
}
return file.readBytes(dst, size);