src/kernel --> src/

src/sys/elf.h

@@ -0,0 +1,78 @@
+// Copyright (c) 2023-2026 Chris (boreddevnl)
+// This software is released under the GNU General Public License v3.0. See LICENSE file for details.
+// This header needs to maintain in any file it is present in, as per the GPL license terms.
+#ifndef ELF_H
+#define ELF_H
+
+#include <stdint.h>
+
+typedef uint16_t Elf64_Half;
+typedef uint32_t Elf64_Word;
+typedef int32_t  Elf64_Sword;
+typedef uint64_t Elf64_Xword;
+typedef int64_t  Elf64_Sxword;
+typedef uint64_t Elf64_Addr;
+typedef uint64_t Elf64_Off;
+
+#define EI_NIDENT 16
+
+typedef struct {
+    unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
+    Elf64_Half    e_type;             /* Object file type */
+    Elf64_Half    e_machine;          /* Architecture */
+    Elf64_Word    e_version;          /* Object file version */
+    Elf64_Addr    e_entry;            /* Entry point virtual address */
+    Elf64_Off     e_phoff;            /* Program header table file offset */
+    Elf64_Off     e_shoff;            /* Section header table file offset */
+    Elf64_Word    e_flags;            /* Processor-specific flags */
+    Elf64_Half    e_ehsize;           /* ELF header size in bytes */
+    Elf64_Half    e_phentsize;        /* Program header table entry size */
+    Elf64_Half    e_phnum;            /* Program header table entry count */
+    Elf64_Half    e_shentsize;        /* Section header table entry size */
+    Elf64_Half    e_shnum;            /* Section header table entry count */
+    Elf64_Half    e_shstrndx;         /* Section header string table index */
+} Elf64_Ehdr;
+
+typedef struct {
+    Elf64_Word    p_type;             /* Segment type */
+    Elf64_Word    p_flags;            /* Segment flags */
+    Elf64_Off     p_offset;           /* Segment file offset */
+    Elf64_Addr    p_vaddr;            /* Segment virtual address */
+    Elf64_Addr    p_paddr;            /* Segment physical address */
+    Elf64_Xword   p_filesz;           /* Segment size in file */
+    Elf64_Xword   p_memsz;            /* Segment size in memory */
+    Elf64_Xword   p_align;            /* Segment alignment */
+} Elf64_Phdr;
+
+/* e_ident constants */
+#define ELFMAG0 0x7f
+#define ELFMAG1 'E'
+#define ELFMAG2 'L'
+#define ELFMAG3 'F'
+#define ELFCLASS64 2
+#define ELFDATA2LSB 1
+#define EV_CURRENT 1
+
+/* e_type constants */
+#define ET_EXEC 2
+#define ET_DYN  3
+
+/* e_machine constants */
+#define EM_X86_64 62
+
+/* p_type constants */
+#define PT_LOAD 1
+
+/* p_flags constants */
+#define PF_X 1
+#define PF_W 2
+#define PF_R 4
+
+#include <stdbool.h>
+#include <stddef.h>
+
+// Loads the ELF executable at 'path' using fat32 into the pagemap given by user_pml4.
+// Returns entry point address on success, or 0 on failure.
+uint64_t elf_load(const char *path, uint64_t user_pml4, size_t *out_load_size);
+
+#endif