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kernel/include/elf/elf.h

@@ -0,0 +1,118 @@
+#ifndef ELF_H
+#define ELF_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include "../memory/vmm.h"
+#include "../memory/paging.h"
+
+#define ELF_MAGIC       0x464C457F
+
+#define EI_CLASS        4
+#define EI_DATA         5
+#define EI_VERSION      6
+#define EI_OSABI        7
+#define EI_NIDENT       16
+
+#define ELFCLASS64      2
+#define ELFDATA2LSB     1
+#define EV_CURRENT      1
+
+#define ET_EXEC         2
+#define ET_DYN          3
+
+#define EM_X86_64       62
+
+#define PT_NULL         0
+#define PT_LOAD         1
+#define PT_DYNAMIC      2
+#define PT_INTERP       3
+#define PT_NOTE         4
+#define PT_PHDR         6
+#define PT_TLS          7
+
+#define PF_X            (1 << 0)
+#define PF_W            (1 << 1)
+#define PF_R            (1 << 2)
+
+#define SHT_NULL        0
+#define SHT_PROGBITS    1
+#define SHT_SYMTAB      2
+#define SHT_STRTAB      3
+#define SHT_RELA        4
+#define SHT_NOBITS      8
+
+typedef struct {
+    uint8_t  e_ident[EI_NIDENT];
+    uint16_t e_type;
+    uint16_t e_machine;
+    uint32_t e_version;
+    uint64_t e_entry;
+    uint64_t e_phoff;
+    uint64_t e_shoff;
+    uint32_t e_flags;
+    uint16_t e_ehsize;
+    uint16_t e_phentsize;
+    uint16_t e_phnum;
+    uint16_t e_shentsize;
+    uint16_t e_shnum;
+    uint16_t e_shstrndx;
+} __attribute__((packed)) elf64_ehdr_t;
+
+typedef struct {
+    uint32_t p_type;
+    uint32_t p_flags;
+    uint64_t p_offset;
+    uint64_t p_vaddr;
+    uint64_t p_paddr;
+    uint64_t p_filesz;
+    uint64_t p_memsz;
+    uint64_t p_align;
+} __attribute__((packed)) elf64_phdr_t;
+
+typedef struct {
+    uint32_t sh_name;
+    uint32_t sh_type;
+    uint64_t sh_flags;
+    uint64_t sh_addr;
+    uint64_t sh_offset;
+    uint64_t sh_size;
+    uint32_t sh_link;
+    uint32_t sh_info;
+    uint64_t sh_addralign;
+    uint64_t sh_entsize;
+} __attribute__((packed)) elf64_shdr_t;
+
+typedef enum {
+    ELF_OK = 0,
+    ELF_ERR_NULL,
+    ELF_ERR_TOO_SMALL,
+    ELF_ERR_BAD_MAGIC,
+    ELF_ERR_NOT_64,
+    ELF_ERR_NOT_LE,
+    ELF_ERR_BAD_VERSION,
+    ELF_ERR_NOT_EXEC,
+    ELF_ERR_WRONG_ARCH,
+    ELF_ERR_NO_LOAD,
+    ELF_ERR_MAP_FAIL,
+    ELF_ERR_NO_MEM,
+} elf_error_t;
+
+typedef struct {
+    uintptr_t       entry;
+    vmm_pagemap_t*  pagemap;
+    uintptr_t       load_base;
+    uintptr_t       stack_top;
+    size_t          stack_size;
+    elf_error_t     error;
+    uintptr_t       load_end;
+} elf_load_result_t;
+
+elf_load_result_t elf_load(const void* data, size_t size, size_t stack_sz);
+
+void elf_unload(elf_load_result_t* result);
+
+const char* elf_strerror(elf_error_t err);
+
+#endif