Initial Commit

src/fs/elf.h

@@ -0,0 +1,117 @@
+#pragma once
+#include <stdint.h>
+#include <stdbool.h>
+
+#define ELF_MAGIC ("\x7F" "ELF")
+
+#include <stdint.h>
+
+typedef struct 
+{
+    uint8_t  Magic[4];
+    uint8_t  Bitness;            // 1 = 32-bit, 2 = 64-bit
+    uint8_t  Endianness;         // 1 = little, 2 = big
+    uint8_t  ELFHeaderVersion;
+    uint8_t  ABI;
+    uint8_t  ABIVersion;
+    uint8_t  _Padding[7];
+
+    uint16_t Type;              // relocatable, executable, shared, core
+    uint16_t InstructionSet;    // architecture (was too small for real ELF, but kept)
+
+    uint32_t ELFVersion;
+
+    uint64_t ProgramEntryPosition;        // FIXED (was 32-bit)
+    uint64_t ProgramHeaderTablePosition;  // FIXED
+    uint64_t SectionHeaderTablePosition;  // FIXED
+
+    uint32_t Flags;
+
+    uint16_t HeaderSize;
+    uint16_t ProgramHeaderTableEntrySize;
+    uint16_t ProgramHeaderTableEntryCount;
+    uint16_t SectionHeaderTableEntrySize;
+    uint16_t SectionHeaderTableEntryCount;
+    uint16_t SectionNamesIndex;
+
+} __attribute__((packed)) ELFHeader;
+
+enum ELFBitness 
+{
+    ELF_BITNESS_32BIT           = 1,
+    ELF_BITNESS_64BIT           = 2,
+};
+
+enum ELFEndianness 
+{
+    ELF_ENDIANNESS_LITTLE       = 1,
+    ELF_ENDIANNESS_BIG          = 2,
+};
+
+enum ELFInstructionSet
+{
+    ELF_INSTRUCTION_SET_NONE    = 0,
+    ELF_INSTRUCTION_SET_X86     = 3,
+    ELF_INSTRUCTION_SET_ARM     = 0x28,
+    ELF_INSTRUCTION_SET_X64     = 0x3E,
+    ELF_INSTRUCTION_SET_ARM64   = 0xB7,
+    ELF_INSTRUCTION_SET_RISCV   = 0xF3,
+};
+
+enum ELFType
+{
+    ELF_TYPE_RELOCATABLE        = 1,
+    ELF_TYPE_EXECUTABLE         = 2,
+    ELF_TYPE_SHARED             = 3,
+    ELF_TYPE_CORE               = 4,
+};
+
+typedef struct
+{
+    uint32_t Type;
+    uint64_t Offset;
+    uint64_t VirtualAddress;
+    uint64_t PhysicalAddress;
+    uint64_t FileSize;
+    uint64_t MemorySize;
+    uint32_t Flags;
+    uint64_t Align;
+
+} ELFProgramHeader;
+
+enum ELFProgramType {
+    // Program header table entry unused.
+    ELF_PROGRAM_TYPE_NULL           = 0,
+
+    // Loadable segment.
+    ELF_PROGRAM_TYPE_LOAD           = 1,
+
+    // Dynamic linking information.
+    ELF_PROGRAM_TYPE_DYNAMIC        = 2,
+
+    // Interpreter information.
+    ELF_PROGRAM_TYPE_INTERP         = 3,
+
+    // Auxiliary information.
+    ELF_PROGRAM_TYPE_NOTE           = 4,
+
+    // Reserved
+    ELF_PROGRAM_TYPE_SHLIB          = 5,
+
+    // Segment containing program header table itself.
+    ELF_PROGRAM_TYPE_PHDR           = 6,
+
+    // Thread-Local Storage template.
+    ELF_PROGRAM_TYPE_TLS            = 7,
+
+    // Reserved inclusive range. Operating system specific.
+    ELF_PROGRAM_TYPE_LOOS           = 0x60000000,
+    ELF_PROGRAM_TYPE_HIOS           = 0x6FFFFFFF,
+
+    // Reserved inclusive range. Processor specific.
+    ELF_PROGRAM_TYPE_LOPROC         = 0x70000000,
+    ELF_PROGRAM_TYPE_HIPROC         = 0x7FFFFFFF,
+};
+
+
+bool ELF_Read(const char* path, void** entryPoint);