From 7f350e7ee1c2c38e5ac0b6c22c17388f6c78f0b5 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Wed, 10 Sep 2025 13:28:28 -0400
Subject: refactor paging code. regression on loading init program

---
 include/elf.h | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 include/elf.h

(limited to 'include/elf.h')

diff --git a/include/elf.h b/include/elf.h
new file mode 100644
index 0000000..05e3e83
--- /dev/null
+++ b/include/elf.h
@@ -0,0 +1,110 @@
+#ifndef _JOVE_ELF_H
+#define _JOVE_ELF_H 1
+
+#include <stdint.h>
+
+/*A subset of the SystemV ELF ABI that only loads statically linked binaries.*/
+
+typedef uint16_t Elf32_Half;
+typedef uint32_t Elf32_Word;
+typedef uint32_t Elf32_Addr;
+typedef uint32_t Elf32_Off;
+
+typedef Elf32_Half Elf64_Half;
+typedef Elf32_Word Elf64_Word;
+typedef uint64_t Elf64_Xword;
+typedef uintptr_t Elf64_Addr;
+typedef uint64_t Elf64_Off;
+
+enum {
+    EI_MAG0 = 0,
+    EI_MAG1,
+    EI_MAG2,
+    EI_MAG3,
+    EI_CLASS,
+    EI_DATA,
+    EI_VERSION,
+    EI_OSABI,
+    EI_ABIVERSION,
+    EI_PAD
+};
+#define EI_NIDENT 16
+
+#define ELFMAG0 0x7f
+#define ELFMAG1 'E'
+#define ELFMAG2 'L'
+#define ELFMAG3 'F'
+
+#define ELFCLASSNONE 0
+#define ELFCLASS64 2
+
+#define ELFDATANONE 0
+#define ELFDATA2LSB 1
+
+#define ET_NONE 0
+#define ET_EXEC 2
+
+#define EM_X86_64 62
+
+#define EV_NONE 0
+#define EV_CURRENT 1
+
+typedef struct {
+    unsigned char e_ident[EI_NIDENT];
+    Elf64_Half e_type;
+    Elf64_Half e_machine;
+    Elf64_Word e_version;
+    Elf64_Addr e_entry;
+    Elf64_Off e_phoff;
+    Elf64_Off e_shoff;
+    Elf64_Word e_flags;
+    Elf64_Half e_ehsize;
+    Elf64_Half e_phentsize;
+    Elf64_Half e_phnum;
+    Elf64_Half e_shentsize;
+    Elf64_Half e_shnum;
+    Elf64_Half e_shstrndx;
+} Elf64_Ehdr;
+
+#define SHT_NULL 0
+#define SHT_PROGBITS 1
+#define SHT_NOBITS 8
+
+#define SHF_WRITE 0x1
+#define SHF_ALLOC 0x2
+
+typedef struct {
+    Elf64_Word sh_name;
+    Elf64_Word sh_type;
+    Elf64_Xword sh_flags;
+    Elf64_Addr sh_addr;
+    Elf64_Off sh_offset;
+    Elf64_Xword sh_size;
+    Elf64_Word sh_link;
+    Elf64_Word sh_info;
+    Elf64_Xword sh_addralign;
+    Elf64_Xword sh_entsize;
+} Elf64_Shdr;
+
+#define PT_NULL 0
+#define PT_LOAD 1
+
+#define PF_X 1
+#define PF_W 2
+#define PF_R 4
+
+typedef struct
+{
+    Elf64_Word p_type;
+    Elf64_Word p_flags;
+    Elf64_Off p_offset;
+    Elf64_Addr p_vaddr;
+    Elf64_Addr p_paddr;
+    Elf64_Xword p_filesz;
+    Elf64_Xword p_memsz;
+    Elf64_Xword p_align;
+} Elf64_Phdr;
+
+int elf64_ehdr_valid(Elf64_Ehdr *ehdr);
+
+#endif
-- 
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