Define elf structures

src/elf.h

@@ -11,4 +11,39 @@
 
 extern uint8_t elf_hello[]  asm("_binary_hello_elf_start");
 
+typedef struct
+{
+    uint32_t magic;     // \x7FELF
+    uint8_t  word_size; // 32/64 bit
+    uint8_t  endianness;
+    uint8_t  elf_version;
+    uint8_t  os_abi;
+    uint64_t unused;
+    uint16_t relocatable;
+    uint16_t instruction_set;
+    uint32_t elf_version_b;
+    void*    program_entry_position;
+    uint32_t program_header_table_offset;
+    uint32_t section_header_table_offset;
+    uint32_t flags;  // undefined in x86
+    uint16_t header_size;
+    uint16_t program_header_entry_size;
+    uint16_t program_header_entry_count;
+    uint16_t section_header_entry_size;
+    uint16_t section_header_entry_count;
+    uint16_t section_header_name_index;
+} elf_header;
+
+typedef struct
+{
+    uint32_t segment_type;
+    uint32_t p_offset; // Offset in the elf file for this segment's data
+    void*    p_vaddr;  // Where this segment should be located in virtual memory
+    uint32_t unused;
+    uint32_t file_segment_size;   // Size of the segment in this file and in memory
+    uint32_t memory_segment_size;
+    uint32_t flags;
+    uint32_t alignment;
+} elf_program_header;
+
 #endif