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123 lines
4.5 KiB
C
123 lines
4.5 KiB
C
// Copyright (c) 2023-2026 Chris (boreddevnl)
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// This software is released under the GNU General Public License v3.0. See LICENSE file for details.
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// This header needs to maintain in any file it is present in, as per the GPL license terms.
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#ifndef ELF_H
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#define ELF_H
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#include <stdint.h>
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typedef uint16_t Elf64_Half;
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typedef uint32_t Elf64_Word;
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typedef int32_t Elf64_Sword;
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typedef uint64_t Elf64_Xword;
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typedef int64_t Elf64_Sxword;
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typedef uint64_t Elf64_Addr;
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typedef uint64_t Elf64_Off;
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#define EI_NIDENT 16
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typedef struct {
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unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
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Elf64_Half e_type; /* Object file type */
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Elf64_Half e_machine; /* Architecture */
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Elf64_Word e_version; /* Object file version */
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Elf64_Addr e_entry; /* Entry point virtual address */
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Elf64_Off e_phoff; /* Program header table file offset */
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Elf64_Off e_shoff; /* Section header table file offset */
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Elf64_Word e_flags; /* Processor-specific flags */
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Elf64_Half e_ehsize; /* ELF header size in bytes */
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Elf64_Half e_phentsize; /* Program header table entry size */
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Elf64_Half e_phnum; /* Program header table entry count */
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Elf64_Half e_shentsize; /* Section header table entry size */
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Elf64_Half e_shnum; /* Section header table entry count */
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Elf64_Half e_shstrndx; /* Section header string table index */
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} Elf64_Ehdr;
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typedef struct {
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Elf64_Word p_type; /* Segment type */
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Elf64_Word p_flags; /* Segment flags */
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Elf64_Off p_offset; /* Segment file offset */
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Elf64_Addr p_vaddr; /* Segment virtual address */
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Elf64_Addr p_paddr; /* Segment physical address */
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Elf64_Xword p_filesz; /* Segment size in file */
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Elf64_Xword p_memsz; /* Segment size in memory */
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Elf64_Xword p_align; /* Segment alignment */
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} Elf64_Phdr;
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typedef struct {
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Elf64_Word sh_name; /* Section name (string tbl index) */
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Elf64_Word sh_type; /* Section type */
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Elf64_Xword sh_flags; /* Section flags */
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Elf64_Addr sh_addr; /* Section virtual addr at execution */
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Elf64_Off sh_offset; /* Section file offset */
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Elf64_Xword sh_size; /* Section size in bytes */
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Elf64_Word sh_link; /* Link to another section */
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Elf64_Word sh_info; /* Additional section information */
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Elf64_Xword sh_addralign; /* Section alignment */
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Elf64_Xword sh_entsize; /* Entry size if section holds table */
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} Elf64_Shdr;
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typedef struct {
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Elf64_Word n_namesz; /* Name size in bytes */
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Elf64_Word n_descsz; /* Descriptor size in bytes */
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Elf64_Word n_type; /* Note type */
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} Elf64_Nhdr;
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/* e_ident constants */
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#define ELFMAG0 0x7f
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#define ELFMAG1 'E'
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#define ELFMAG2 'L'
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#define ELFMAG3 'F'
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#define ELFCLASS64 2
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#define ELFDATA2LSB 1
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#define EV_CURRENT 1
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/* e_type constants */
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#define ET_EXEC 2
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#define ET_DYN 3
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/* e_machine constants */
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#define EM_X86_64 62
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/* p_type constants */
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#define PT_LOAD 1
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/* sh_type constants */
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#define SHT_NOTE 7
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/* p_flags constants */
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#define PF_X 1
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#define PF_W 2
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#define PF_R 4
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/* BoredOS app metadata note constants */
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#define BOREDOS_APP_NOTE_OWNER "BOREDOS"
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#define BOREDOS_APP_NOTE_NAME BOREDOS_APP_NOTE_OWNER
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#define BOREDOS_APP_NOTE_SECTION ".note.boredos.app"
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#define BOREDOS_APP_NOTE_TYPE 0x41505031U
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#define BOREDOS_APP_METADATA_MAGIC 0x414d4431U
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#define BOREDOS_APP_METADATA_VERSION 1U
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#define BOREDOS_APP_METADATA_MAX_APP_NAME 64
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#define BOREDOS_APP_METADATA_MAX_DESCRIPTION 192
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#define BOREDOS_APP_METADATA_MAX_IMAGES 4
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#define BOREDOS_APP_METADATA_MAX_IMAGE_PATH 160
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typedef struct __attribute__((packed)) {
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uint32_t magic;
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uint16_t version;
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uint16_t image_count;
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uint16_t reserved;
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char app_name[BOREDOS_APP_METADATA_MAX_APP_NAME];
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char description[BOREDOS_APP_METADATA_MAX_DESCRIPTION];
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char images[BOREDOS_APP_METADATA_MAX_IMAGES][BOREDOS_APP_METADATA_MAX_IMAGE_PATH];
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} boredos_app_metadata_t;
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#include <stdbool.h>
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#include <stddef.h>
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// Loads the ELF executable at 'path' using fat32 into the pagemap given by user_pml4.
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// Returns entry point address on success, or 0 on failure.
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uint64_t elf_load(const char *path, uint64_t user_pml4, size_t *out_load_size);
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#endif
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