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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
------------------------------------------- */
#include <KernelKit/DebugOutput.h>
#include <KernelKit/MemoryMgr.h>
#include <KernelKit/PEFCodeMgr.h>
#include <KernelKit/ProcessScheduler.h>
#include <NewKit/Defines.h>
#include <NewKit/KString.h>
#include <NewKit/KernelPanic.h>
#include <NewKit/OwnPtr.h>
/// @brief PEF stack size symbol.
#define kPefStackSizeSymbol "__PEFSizeOfReserveStack"
#define kPefHeapSizeSymbol "__PEFSizeOfReserveHeap"
#define kPefNameSymbol "__PEFProgramName"
namespace Kernel {
namespace Detail {
/***********************************************************************************/
/// @brief Get the PEF platform signature according to the compiled architecture.
/***********************************************************************************/
UInt32 ldr_get_platform(void) noexcept {
#if defined(__NE_32X0__)
return kPefArch32x0;
#elif defined(__NE_64X0__)
return kPefArch64x0;
#elif defined(__NE_AMD64__)
return kPefArchAMD64;
#elif defined(__NE_PPC64__)
return kPefArchPowerPC;
#elif defined(__NE_ARM64__)
return kPefArchARM64;
#else
return kPefArchInvalid;
#endif // __32x0__ || __64x0__ || __x86_64__
}
} // namespace Detail
/***********************************************************************************/
/// @brief PEF loader constructor w/ blob.
/// @param blob file blob.
/***********************************************************************************/
PEFLoader::PEFLoader(const VoidPtr blob) : fCachedBlob(blob) {
MUST_PASS(fCachedBlob);
fBad = false;
}
/***********************************************************************************/
/// @brief PEF loader constructor.
/// @param path the filesystem path.
/***********************************************************************************/
PEFLoader::PEFLoader(const Char* path) : fCachedBlob(nullptr), fFatBinary(false), fBad(false) {
fFile.New(const_cast<Char*>(path), kRestrictRB);
fPath = KStringBuilder::Construct(path).Leak();
auto kPefHeader = "PEF_CONTAINER";
fCachedBlob = fFile->Read(kPefHeader, mib_cast(16));
PEFContainer* container = reinterpret_cast<PEFContainer*>(fCachedBlob);
if (container->Cpu == Detail::ldr_get_platform() && container->Magic[0] == kPefMagic[0] &&
container->Magic[1] == kPefMagic[1] && container->Magic[2] == kPefMagic[2] &&
container->Magic[3] == kPefMagic[3] && container->Magic[4] == kPefMagic[4] &&
container->Abi == kPefAbi) {
return;
} else if (container->Magic[4] == kPefMagic[0] && container->Magic[3] == kPefMagic[1] &&
container->Magic[2] == kPefMagic[2] && container->Magic[1] == kPefMagic[3] &&
container->Magic[0] == kPefMagic[4] && container->Abi == kPefAbi) {
/// This is a fat binary.
this->fFatBinary = true;
return;
}
fBad = true;
if (fCachedBlob) mm_delete_heap(fCachedBlob);
kout << "PEFLoader: warn: Executable format error!\r";
fCachedBlob = nullptr;
}
/***********************************************************************************/
/// @brief PEF destructor.
/***********************************************************************************/
PEFLoader::~PEFLoader() {
if (fCachedBlob) mm_delete_heap(fCachedBlob);
fFile.Delete();
}
/***********************************************************************************/
/// @brief Finds the symbol according to it's name.
/// @param name name of symbol.
/// @param kind kind of symbol we want.
/***********************************************************************************/
VoidPtr PEFLoader::FindSymbol(const Char* name, Int32 kind) {
if (!fCachedBlob || fBad || !name) return nullptr;
PEFContainer* container = reinterpret_cast<PEFContainer*>(fCachedBlob);
auto blob = fFile->Read(name, mib_cast(16));
PEFCommandHeader* container_header = reinterpret_cast<PEFCommandHeader*>(blob);
constexpr auto cMangleCharacter = '$';
const Char* cContainerKinds[] = {".code64", ".data64", ".zero64", nullptr};
ErrorOr<KString> error_or_symbol;
switch (kind) {
case kPefCode: {
error_or_symbol = KStringBuilder::Construct(cContainerKinds[0]); // code symbol.
break;
}
case kPefData: {
error_or_symbol = KStringBuilder::Construct(cContainerKinds[1]); // data symbol.
break;
}
case kPefZero: {
error_or_symbol = KStringBuilder::Construct(cContainerKinds[2]); // block starting symbol.
break;
}
default:
return nullptr; // prevent that from the kernel's mode perspective, let that happen if it
// were a user process.
}
Char* unconst_symbol = const_cast<Char*>(name);
for (SizeT i = 0UL; i < rt_string_len(unconst_symbol, kPefNameLen); ++i) {
if (unconst_symbol[i] == ' ') {
unconst_symbol[i] = cMangleCharacter;
}
}
error_or_symbol.Leak().Leak() += name;
for (SizeT index = 0; index < container->Count; ++index) {
if (KStringBuilder::Equals(container_header->Name, error_or_symbol.Leak().Leak().CData())) {
if (container_header->Kind == kind) {
if (container_header->Cpu != Detail::ldr_get_platform()) {
if (!this->fFatBinary) {
mm_delete_heap(blob);
return nullptr;
}
}
Char* container_blob_value = new Char[container_header->Size];
rt_copy_memory((VoidPtr) ((Char*) blob + sizeof(PEFCommandHeader)), container_blob_value,
container_header->Size);
mm_delete_heap(blob);
kout << "PEFLoader: INFO: Load stub: " << container_header->Name << "!\r";
return container_blob_value;
}
}
}
mm_delete_heap(blob);
return nullptr;
}
/// @brief Finds the executable entrypoint.
/// @return
ErrorOr<VoidPtr> PEFLoader::FindStart() {
if (auto sym = this->FindSymbol(kPefStart, kPefCode); sym) return ErrorOr<VoidPtr>(sym);
return ErrorOr<VoidPtr>(kErrorExecutable);
}
/// @brief Tells if the executable is loaded or not.
/// @return
bool PEFLoader::IsLoaded() noexcept {
return !fBad && fCachedBlob;
}
const Char* PEFLoader::Path() {
return fPath.Leak().CData();
}
const Char* PEFLoader::AsString() {
#ifdef __32x0__
return "32x0 PEF executable.";
#elif defined(__64x0__)
return "64x0 PEF executable.";
#elif defined(__x86_64__)
return "x86_64 PEF executable.";
#elif defined(__aarch64__)
return "AARCH64 PEF executable.";
#elif defined(__powerpc64__)
return "POWER64 PEF executable.";
#else
return "???? PEF executable.";
#endif // __32x0__ || __64x0__ || __x86_64__ || __powerpc64__
}
const Char* PEFLoader::MIME() {
return kPefApplicationMime;
}
ErrorOr<VoidPtr> PEFLoader::GetBlob() {
return ErrorOr<VoidPtr>{this->fCachedBlob};
}
namespace Utils {
ProcessID rtl_create_user_process(PEFLoader& exec, const Int32& process_kind) noexcept {
auto errOrStart = exec.FindStart();
if (errOrStart.Error() != kErrorSuccess) return kSchedInvalidPID;
auto id = UserProcessScheduler::The().Spawn(
reinterpret_cast<const Char*>(exec.FindSymbol(kPefNameSymbol, kPefData)),
errOrStart.Leak().Leak(), exec.GetBlob().Leak().Leak());
if (id != kSchedInvalidPID) {
UserProcessScheduler::The().CurrentTeam().AsArray()[id].Kind = process_kind;
UserProcessScheduler::The().CurrentTeam().AsArray()[id].StackSize =
*(UIntPtr*) exec.FindSymbol(kPefStackSizeSymbol, kPefData);
UserProcessScheduler::The().CurrentTeam().AsArray()[id].MemoryLimit =
*(UIntPtr*) exec.FindSymbol(kPefHeapSizeSymbol, kPefData);
}
return id;
}
} // namespace Utils
} // namespace Kernel
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