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Update file loading

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This commit is contained in:
Alex
2022-11-07 08:34:22 +02:00
parent 2bd8e8d948
commit b60ec62bde
7 changed files with 918 additions and 29 deletions
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197
Execute/Parse.cpp
View File

@ -1,5 +1,7 @@
#include <exec.hpp>
#include <msexec.h>
#include "../kernel.h"
#include "../Fex.hpp"
@ -15,14 +17,47 @@ namespace Execute
if (ExFile->Node->Flags == FileSystem::NodeFlags::FS_FILE)
{
Fex *FexHdr = (Fex *)ExFile->Node->Address;
Elf64_Ehdr *ELFHeader = (Elf64_Ehdr *)ExFile->Node->Address;
IMAGE_DOS_HEADER *MZHeader = (IMAGE_DOS_HEADER *)ExFile->Node->Address;
if (FexHdr->Magic[0] == 'F' && FexHdr->Magic[1] == 'E' && FexHdr->Magic[2] == 'X' && FexHdr->Magic[3] == '\0')
{
if (FexHdr->Type == FexFormatType::FexFormatType_Executable)
{
trace("%s - Fex", Path);
Type = BinaryType::BinTypeFex;
goto Exit;
}
}
else if (ELFHeader->e_ident[EI_MAG0] == ELFMAG0 &&
ELFHeader->e_ident[EI_MAG1] == ELFMAG1 &&
ELFHeader->e_ident[EI_MAG2] == ELFMAG2 &&
ELFHeader->e_ident[EI_MAG3] == ELFMAG3)
{
trace("%s - ELF", Path);
Type = BinaryType::BinTypeELF;
goto Exit;
}
else if (MZHeader->e_magic == IMAGE_DOS_SIGNATURE)
{
IMAGE_NT_HEADERS *PEHeader = (IMAGE_NT_HEADERS *)(((char *)ExFile->Node->Address) + MZHeader->e_lfanew);
IMAGE_OS2_HEADER *NEHeader = (IMAGE_OS2_HEADER *)(((char *)ExFile->Node->Address) + MZHeader->e_lfanew);
if (NEHeader->ne_magic == IMAGE_OS2_SIGNATURE)
{
trace("%s - NE", Path);
Type = BinaryType::BinTypeNE;
}
else if (PEHeader->Signature == IMAGE_NT_SIGNATURE)
{
trace("%s - PE", Path);
Type = BinaryType::BinTypePE;
}
else
{
trace("%s - MZ", Path);
Type = BinaryType::BinTypeMZ;
}
goto Exit;
}
/* ... */
@ -33,4 +68,166 @@ namespace Execute
vfs->Close(ExFile);
return Type;
}
/* Originally from https://wiki.osdev.org/ELF_Tutorial */
static inline Elf64_Shdr *GetElfSheader(Elf64_Ehdr *Header) { return (Elf64_Shdr *)((uint64_t)Header + Header->e_shoff); }
static inline Elf64_Shdr *GetElfSection(Elf64_Ehdr *Header, uint64_t Index) { return &GetElfSheader(Header)[Index]; }
static inline char *GetElfStringTable(Elf64_Ehdr *Header)
{
if (Header->e_shstrndx == SHN_UNDEF)
return nullptr;
return (char *)Header + GetElfSection(Header, Header->e_shstrndx)->sh_offset;
}
static inline char *elf_lookup_string(Elf64_Ehdr *Header, uint64_t Offset)
{
char *StringTable = GetElfStringTable(Header);
if (StringTable == nullptr)
return nullptr;
return StringTable + Offset;
}
static void *ElfLookupSymbol(Elf64_Ehdr *Header, const char *Name)
{
Elf64_Shdr *SymbolTable = nullptr;
Elf64_Shdr *StringTable = nullptr;
Elf64_Sym *Symbol = nullptr;
char *String = nullptr;
for (Elf64_Half i = 0; i < Header->e_shnum; i++)
{
Elf64_Shdr *shdr = GetElfSection(Header, i);
switch (shdr->sh_type)
{
case SHT_SYMTAB:
SymbolTable = shdr;
StringTable = GetElfSection(Header, shdr->sh_link);
break;
}
}
if (SymbolTable == nullptr || StringTable == nullptr)
return nullptr;
for (uint64_t i = 0; i < (SymbolTable->sh_size / sizeof(Elf64_Sym)); i++)
{
Symbol = (Elf64_Sym *)((uint64_t)Header + SymbolTable->sh_offset + (i * sizeof(Elf64_Sym)));
String = (char *)((uint64_t)Header + StringTable->sh_offset + Symbol->st_name);
if (strcmp(String, Name) == 0)
return (void *)Symbol->st_value;
}
return nullptr;
}
static uint64_t ELFGetSymbolValue(Elf64_Ehdr *Header, uint64_t Table, uint32_t Index)
{
if (Table == SHN_UNDEF || Index == SHN_UNDEF)
return 0;
Elf64_Shdr *SymbolTable = GetElfSection(Header, Table);
uint32_t STEntries = SymbolTable->sh_size / SymbolTable->sh_entsize;
if (Index >= STEntries)
{
error("Symbol index out of range %d-%u.", Table, Index);
return 0xdead;
}
uint64_t SymbolAddress = (uint64_t)Header + SymbolTable->sh_offset;
Elf32_Sym *Symbol = &((Elf32_Sym *)SymbolAddress)[Index];
if (Symbol->st_shndx == SHN_UNDEF)
{
Elf64_Shdr *StringTable = GetElfSection(Header, SymbolTable->sh_link);
const char *Name = (const char *)Header + StringTable->sh_offset + Symbol->st_name;
void *Target = ElfLookupSymbol(Header, Name);
if (Target == nullptr)
{
if (ELF32_ST_BIND(Symbol->st_info) & STB_WEAK)
return 0;
else
{
error("Undefined external symbol \"%s\".", Name);
return 0xdead;
}
}
else
return (uint64_t)Target;
}
else if (Symbol->st_shndx == SHN_ABS)
return Symbol->st_value;
else
{
Elf64_Shdr *Target = GetElfSection(Header, Symbol->st_shndx);
return (uint64_t)Header + Symbol->st_value + Target->sh_offset;
}
}
void *ELFLoadRel(Elf64_Ehdr *Header)
{
Elf64_Shdr *shdr = GetElfSheader(Header);
for (uint64_t i = 0; i < Header->e_shnum; i++)
{
Elf64_Shdr *Section = &shdr[i];
if (Section->sh_type == SHT_NOBITS)
{
if (!Section->sh_size)
continue;
if (Section->sh_flags & SHF_ALLOC)
{
void *Buffer = KernelAllocator.RequestPages(TO_PAGES(Section->sh_size));
memset(Buffer, 0, Section->sh_size);
Memory::Virtual pva = Memory::Virtual(/* TODO TODO TODO TODO TODO TODO */);
for (uint64_t i = 0; i < TO_PAGES(Section->sh_size); i++)
pva.Map((void *)((uint64_t)Buffer + (i * PAGE_SIZE)), (void *)((uint64_t)Buffer + (i * PAGE_SIZE)), Memory::PTFlag::RW | Memory::PTFlag::US);
Section->sh_offset = (uint64_t)Buffer - (uint64_t)Header;
debug("Section %ld", Section->sh_size);
}
}
}
for (uint64_t i = 0; i < Header->e_shnum; i++)
{
Elf64_Shdr *Section = &shdr[i];
if (Section->sh_type == SHT_REL)
{
for (uint64_t Index = 0; Index < Section->sh_size / Section->sh_entsize; Index++)
{
Elf64_Rel *RelTable = &((Elf64_Rel *)((uint64_t)Header + Section->sh_offset))[Index];
Elf64_Shdr *Target = GetElfSection(Header, Section->sh_info);
uint64_t *RelAddress = (uint64_t *)(((uint64_t)Header + Target->sh_offset) + RelTable->r_offset);
uint64_t SymbolValue = 0;
if (ELF64_R_SYM(RelTable->r_info) != SHN_UNDEF)
{
SymbolValue = ELFGetSymbolValue(Header, Section->sh_link, ELF64_R_SYM(RelTable->r_info));
if (SymbolValue == 0xdead)
return (void *)0xdeadbeef;
}
switch (ELF64_R_TYPE(RelTable->r_info))
{
case R_386_NONE:
break;
case R_386_32:
*RelAddress = DO_64_64(SymbolValue, *RelAddress);
break;
case R_386_PC32:
*RelAddress = DO_64_PC32(SymbolValue, *RelAddress, (uint64_t)RelAddress);
break;
default:
error("Unsupported relocation type: %d", ELF64_R_TYPE(RelTable->r_info));
return (void *)0xdeadbeef;
}
debug("Symbol value: %#lx", SymbolValue);
}
}
}
return (void *)Header->e_entry;
}
}

168
Execute/Spawn.cpp
View File

@ -2,7 +2,9 @@
#include <memory.hpp>
#include <lock.hpp>
#include <msexec.h>
#include <cwalk.h>
#include <elf.h>
#include "../kernel.h"
#include "../Fex.hpp"
@ -27,40 +29,151 @@ namespace Execute
case BinaryType::BinTypeFex:
{
Fex *FexHdr = (Fex *)ExFile->Node->Address;
if (FexHdr->Magic[0] == 'F' && FexHdr->Magic[1] == 'E' && FexHdr->Magic[2] == 'X' && FexHdr->Magic[3] == '\0')
if (FexHdr->Type == FexFormatType::FexFormatType_Executable)
{
if (FexHdr->Type == FexFormatType::FexFormatType_Executable)
const char *BaseName;
cwk_path_get_basename(Path, &BaseName, nullptr);
PCB *Process = TaskManager->CreateProcess(TaskManager->GetCurrentProcess(), BaseName, TaskTrustLevel::User);
void *BaseImage = KernelAllocator.RequestPages(TO_PAGES(ExFile->Node->Length));
memcpy(BaseImage, (void *)ExFile->Node->Address, ExFile->Node->Length);
Memory::Virtual pva = Memory::Virtual(Process->PageTable);
for (uint64_t i = 0; i < TO_PAGES(ExFile->Node->Length); i++)
pva.Map((void *)((uint64_t)BaseImage + (i * PAGE_SIZE)), (void *)((uint64_t)BaseImage + (i * PAGE_SIZE)), Memory::PTFlag::RW | Memory::PTFlag::US);
TCB *Thread = TaskManager->CreateThread(Process,
(IP)FexHdr->Pointer,
Arg0, Arg1,
(IPOffset)BaseImage,
TaskArchitecture::x64,
TaskCompatibility::Native);
ret.Process = Process;
ret.Thread = Thread;
ret.Status = ExStatus::OK;
goto Exit;
}
ret.Status = ExStatus::InvalidFileHeader;
goto Exit;
}
case BinaryType::BinTypeELF:
{
const char *BaseName;
cwk_path_get_basename(Path, &BaseName, nullptr);
PCB *Process = TaskManager->CreateProcess(TaskManager->GetCurrentProcess(), BaseName, TaskTrustLevel::User);
void *BaseImage = KernelAllocator.RequestPages(TO_PAGES(ExFile->Node->Length));
memcpy(BaseImage, (void *)ExFile->Node->Address, ExFile->Node->Length);
Memory::Virtual pva = Memory::Virtual(Process->PageTable);
for (uint64_t i = 0; i < TO_PAGES(ExFile->Node->Length); i++)
pva.Map((void *)((uint64_t)BaseImage + (i * PAGE_SIZE)), (void *)((uint64_t)BaseImage + (i * PAGE_SIZE)), Memory::PTFlag::RW | Memory::PTFlag::US);
Elf64_Ehdr *ELFHeader = (Elf64_Ehdr *)BaseImage;
TaskArchitecture Arch = TaskArchitecture::x64;
TaskCompatibility Comp = TaskCompatibility::Native;
if (ELFHeader->e_machine == EM_386)
Arch = TaskArchitecture::x32;
else if (ELFHeader->e_machine == EM_AMD64)
Arch = TaskArchitecture::x64;
else if (ELFHeader->e_machine == EM_AARCH64)
Arch = TaskArchitecture::ARM64;
else
Arch = TaskArchitecture::UnknownArchitecture;
// TODO: Should I care about this?
if (ELFHeader->e_ident[EI_CLASS] == ELFCLASS32)
{
if (ELFHeader->e_ident[EI_DATA] == ELFDATA2LSB)
fixme("ELF32 LSB");
else if (ELFHeader->e_ident[EI_DATA] == ELFDATA2MSB)
fixme("ELF32 MSB");
else
fixme("ELF32 Unknown");
}
else if (ELFHeader->e_ident[EI_CLASS] == ELFCLASS64)
{
if (ELFHeader->e_ident[EI_DATA] == ELFDATA2LSB)
fixme("ELF64 LSB");
else if (ELFHeader->e_ident[EI_DATA] == ELFDATA2MSB)
fixme("ELF64 MSB");
else
fixme("ELF64 Unknown");
}
else
fixme("Unknown ELF");
if (ELFHeader->e_type == ET_EXEC)
{
trace("Executable");
Elf64_Phdr *pheader = (Elf64_Phdr *)(((char *)BaseImage) + ELFHeader->e_phoff);
void *Address = nullptr;
for (int i = 0; i < ELFHeader->e_phnum; i++, pheader++)
{
const char *BaseName;
cwk_path_get_basename(Path, &BaseName, nullptr);
PCB *Process = TaskManager->CreateProcess(TaskManager->GetCurrentProcess(), BaseName, TaskTrustLevel::User);
if (pheader->p_type != PT_LOAD)
continue;
Address = (void *)((uint64_t)pheader->p_vaddr + pheader->p_memsz);
}
void *Offset = KernelAllocator.RequestPages(TO_PAGES((uint64_t)Address));
void *BaseImage = KernelAllocator.RequestPages(TO_PAGES(ExFile->Node->Length));
memcpy(BaseImage, (void *)ExFile->Node->Address, ExFile->Node->Length);
for (uint64_t i = 0; i < TO_PAGES((uint64_t)Address); i++)
pva.Map((void *)((uint64_t)Offset + (i * PAGE_SIZE)), (void *)((uint64_t)Offset + (i * PAGE_SIZE)), Memory::PTFlag::RW | Memory::PTFlag::US);
/*
For some reason I can't map BaseImage.
Neither can I in the Tasking->CreateThread function.
Very strange.
*/
pheader = (Elf64_Phdr *)(((char *)BaseImage) + ELFHeader->e_phoff);
for (int i = 0; i < ELFHeader->e_phnum; i++, pheader++)
{
if (pheader->p_type != PT_LOAD)
continue;
void *dst = (void *)((uint64_t)pheader->p_vaddr + (uint64_t)Offset);
memset(dst, 0, pheader->p_memsz);
memcpy(dst, ((char *)BaseImage) + pheader->p_offset, pheader->p_filesz);
}
Memory::Virtual pva = Memory::Virtual(Process->PageTable);
for (uint64_t i = 0; i < TO_PAGES(ExFile->Node->Length); i++)
pva.Map((void *)((uint64_t)BaseImage + (i * PAGE_SIZE)), (void *)((uint64_t)BaseImage + (i * PAGE_SIZE)), Memory::PTFlag::RW | Memory::PTFlag::US);
TCB *Thread = TaskManager->CreateThread(Process,
(IP)FexHdr->Pointer,
Arg0, Arg1,
(IPOffset)BaseImage,
TaskArchitecture::x64,
TaskCompatibility::Native);
ret.Process = Process;
ret.Thread = Thread;
ret.Status = ExStatus::OK;
TCB *Thread = TaskManager->CreateThread(Process,
(IP)ELFHeader->e_entry,
Arg0, Arg1,
(IPOffset)Offset,
Arch,
Comp);
ret.Process = Process;
ret.Thread = Thread;
ret.Status = ExStatus::OK;
goto Exit;
}
else if (ELFHeader->e_type == ET_DYN)
{
fixme("Shared Object");
}
else if (ELFHeader->e_type == ET_REL)
{
trace("Relocatable");
void *EP = ELFLoadRel(ELFHeader);
if (EP == (void *)0xdeadbeef || EP == 0x0)
{
ret.Status = ExStatus::InvalidFileEntryPoint;
goto Exit;
}
TCB *Thread = TaskManager->CreateThread(Process,
(IP)EP,
Arg0, Arg1,
(IPOffset)BaseImage,
Arch,
Comp);
ret.Process = Process;
ret.Thread = Thread;
ret.Status = ExStatus::OK;
goto Exit;
}
else if (ELFHeader->e_type == ET_CORE)
{
fixme("Core");
}
else
{
fixme("Unknown");
}
ret.Status = ExStatus::InvalidFileHeader;
goto Exit;
}
@ -83,6 +196,9 @@ namespace Execute
}
Exit:
if (ret.Status != ExStatus::OK)
if (ret.Process)
ret.Process->Status = TaskStatus::Terminated;
vfs->Close(ExFile);
return ret;
}