MMU: Extra asserts to avoid future regressions

1 files changed, 188 insertions, 0 deletions

diff --git a/include/elf.h b/include/elf.h
new file mode 100644
index 0000000..f1c0f5c
--- /dev/null
+++ b/include/elf.h
@@ -0,0 +1,188 @@
+#ifndef ELF_H
+#define ELF_H
+#include <assert.h>
+#ifdef KERNEL
+#include <fs/vfs.h>
+#include <mmu.h>
+#endif
+#include <typedefs.h>
+
+#define EI_NIDENT 16
+
+#define SHN_UNDEF 0
+#define SHN_LORESERVE 0xff00
+#define SHN_LOPROC 0xff00
+#define SHN_HIPROC 0xff1f
+#define SHN_ABS 0xfff1
+#define SHN_COMMON 0xfff2
+#define SHN_HIRESERVE 0xffff
+
+#define ELF32_R_SYM(i) ((i) >> 8)
+#define ELF32_R_TYPE(i) ((unsigned char)(i))
+#define ELF32_R_INFO(s, t) (((s) << 8) + (unsigned char)(t))
+
+#define ELF32_ST_BIND(i) ((i)>>4)
+#define ELF32_ST_TYPE(i) ((i)&0xf)
+#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf))
+
+#define ET_NONE 0        // No file type
+#define ET_REL 1         // Relocatable file
+#define ET_EXEC 2        // Executable file
+#define ET_DYN 3         // Shared object file
+#define ET_CORE 4        // Core file
+#define ET_LOPROC 0xff00 // Processor-specific
+#define ET_HIPROC 0xffff // Processor-specific
+
+#define EM_NONE 0  // No machine
+#define EM_M32 1   // AT&T WE 32100
+#define EM_SPARC 2 // SPARC
+#define EM_386 3   // Intel 80386
+#define EM_68K 4   // Motorola 68000
+#define EM_88K 5   // Motorola 88000
+#define EM_860 7   // Intel 80860
+#define EM_MIPS 8  // MIPS RS3000
+
+#define EV_NONE 0    // Invalid version
+#define EV_CURRENT 1 // Current version
+
+#define ELF_EXECUTABLE (1 << 0)
+#define ELF_WRITABLE (1 << 1)
+#define ELF_READABLE (1 << 2)
+
+#define Elf32_Addr u32  // Unsigned program address
+#define Elf32_Half u16  // Unsigned medium integer
+#define Elf32_Off u32   // Unsigned file offset
+#define Elf32_Sword u32 // Signed large integer
+#define Elf32_Word u32  // Unsigned large integer
+
+#define STT_NOTYPE 0
+#define STT_OBJECT 1
+#define STT_FUNC 2
+#define STT_SECTION 3
+#define STT_FILE 4
+#define STT_LOPROC 13
+#define STT_HIPROC 15
+
+#define SHF_WRITE 0x1
+#define SHF_ALLOC 0x2
+#define SHF_EXECINSTR 0x4
+#define SHF_MASKPROC 0xf0000000
+
+#define ELFCLASSNONE 0
+#define ELFCLASS32 1
+#define ELFCLASS64 2
+
+#define STB_LOCAL 0
+#define STB_GLOBAL 1
+#define STB_WEAK 2
+#define STB_LOPROC 13
+#define STB_HIPROC 15
+
+#define ELFDATANONE 0
+#define ELFDATA2LSB 1
+#define ELFDATA2MSB 2
+
+#define R_386_NONE 0
+#define R_386_32 1
+#define R_386_PC32 2
+#define R_386_GOT32 3
+#define R_386_PLT32 4
+#define R_386_COPY 5
+#define R_386_GLOB_DAT 6
+#define R_386_JMP_SLOT 7
+#define R_386_RELATIVE 8
+#define R_386_GOTOFF 9
+#define R_386_GOTPC 10
+
+#define ELF_EXEC (1 << 0)
+#define ELF_WRITE (1 << 1)
+#define ELF_READ (1 << 2)
+
+// ELF header
+typedef struct {
+  unsigned char e_ident[16];
+  Elf32_Half e_type;    // Object file type      (ET_*)
+  Elf32_Half e_machine; // Required architecture (EM_*)
+  Elf32_Word e_version; // Object file version   (EV_*)
+  Elf32_Addr e_entry;   // File entry point
+  Elf32_Off e_phoff;    // Program header table's offset(bytes)
+  Elf32_Off e_shoff;    // Section header table's offset(bytes)
+  Elf32_Word e_flags;
+  Elf32_Half e_ehsize; // ELF Header size
+  Elf32_Half
+      e_phentsize;    // Size of program's header tables(all are the same size)
+  Elf32_Half e_phnum; // Amount of program headers
+  Elf32_Half e_shentsize;
+  Elf32_Half e_shnum;
+  Elf32_Half e_shstrndx;
+} __attribute__((packed)) ELFHeader;
+
+typedef struct {
+  Elf32_Addr r_offset;
+  Elf32_Word r_info;
+} Elf32_Rel;
+
+typedef struct {
+  Elf32_Word st_name;
+  Elf32_Addr st_value;
+  Elf32_Word st_size;
+  unsigned char st_info;
+  unsigned char st_other;
+  Elf32_Half st_shndx;
+} Elf32_Sym;
+
+typedef struct {
+  unsigned char e_ident[EI_NIDENT];
+  Elf32_Half e_type;
+  Elf32_Half e_machine;
+  Elf32_Word e_version;
+  Elf32_Addr e_entry;
+  Elf32_Off e_phoff;
+  Elf32_Off e_shoff;
+  Elf32_Word e_flags;
+  Elf32_Half e_ehsize;
+  Elf32_Half e_phentsize;
+  Elf32_Half e_phnum;
+  Elf32_Half e_shentsize;
+  Elf32_Half e_shnum;
+  Elf32_Half e_shstrndx;
+} Elf32_Ehdr;
+
+// Section header
+typedef struct {
+  Elf32_Word sh_name;
+  Elf32_Word sh_type;
+  Elf32_Word sh_flags;
+  Elf32_Addr sh_addr;
+  Elf32_Off sh_offset;
+  Elf32_Word sh_size;
+  Elf32_Word sh_link;
+  Elf32_Word sh_info;
+  Elf32_Word sh_addralign;
+  Elf32_Word sh_entsize;
+} Elf32_Shdr;
+
+enum ShT_Types {
+  SHT_NULL = 0,     // Null section
+  SHT_PROGBITS = 1, // Program information
+  SHT_SYMTAB = 2,   // Symbol table
+  SHT_STRTAB = 3,   // String table
+  SHT_RELA = 4,     // Relocation (w/ addend)
+  SHT_NOBITS = 8,   // Not present in file
+  SHT_REL = 9,      // Relocation (no addend)
+};
+
+// Program header
+typedef struct {
+  Elf32_Word p_type;
+  Elf32_Off p_offset;
+  Elf32_Addr p_vaddr;
+  Elf32_Addr p_paddr;
+  Elf32_Word p_filesz;
+  Elf32_Word p_memsz;
+  Elf32_Word p_flags;
+  Elf32_Word p_align;
+} __attribute__((packed)) Elf32_Phdr;
+
+void *load_elf_file(const char *f, u32 *ds);
+#endif