Merge branch 'thread_scheduler' of gitlab.istic.univ-rennes1.fr:simpleos/burritos into thread_scheduler

src/kernel/elf.rs

@@ -0,0 +1,143 @@
+//Declaration des alias
+
+/*
+ Def ELF : 
+
+ The  header  file  <elf.h>  defines the format of ELF executable binary
+       files.  Amongst these files are normal  executable  files,  relocatable
+       object files, core files and shared libraries.
+
+       An executable file using the ELF file format consists of an ELF header,
+       followed by a program header table or a section header table, or  both.
+       The  ELF  header  is  always  at  offset zero of the file.  The program
+       header table and the section header table's  offset  in  the  file  are
+       defined  in  the  ELF  header.  The two tables describe the rest of the
+       particularities of the file
+ */
+
+
+/* Type for a 16-bit quantity.  */
+
+type Elf32_Half = u16;
+
+type Elf64_Half = u16;
+
+/* Types for signed and unsigned 32-bit quantities.  */
+
+type Elf32_Word = u32;
+
+type Elf32_Sword = i32;
+
+type Elf64_Word = u32;
+
+type Elf64_Sword = i32;
+
+/* Types for signed and unsigned 64-bit quantities.  */
+
+type Elf32_Xword = u64;
+
+type Elf32_Sxword = i64;
+
+type Elf64_Xword = u64;
+
+type Elf64_Sxword = i64;
+
+/* Type of addresses.  */
+
+type Elf32_Addr = u32;
+
+type Elf64_Addr = u64;
+
+/* Type of file offsets.  */
+
+type Elf32_Off = u32;
+
+type Elf64_Off = u64;
+
+//role de ce truc ?
+const EI_NIDENT : u8 = 16;
+
+//ELF file header 32 bits
+struct Elf32Ehdr{
+      e_ident : [u8;EI_NIDENT],//16 octects décrivant comment le fichier doit etre parsé
+      //e_ident must starts with magice number : 0x 7f 45 4c 46
+      e_type : Elf32_Half,//type of the file
+      e_machine : Elf32_Half,//type architecture machine
+      e_version : Elf32_Word,//always 1
+      e_entry : Elf32_Addr,//entry point @ for executable
+      e_phoff : Elf32_Off,//Offset of the program header table
+      e_shoff : Elf32_Off,//Offset of the section header table
+      e_flags : Elf32_Word,//des flags ?
+      e_ehsize : Elf32_Half,//size of this (the header), redundant
+      e_phentsize : Elf32_Half,//size per program header
+      e_phnum : Elf32_Half,//number of program header
+      e_shentsize : Elf32_Half,//size per section header
+      e_shnum : Elf32_Half,//number of section header
+      e_shstrndx : Elf32_Half//section header string table index
+}
+
+
+//ELF file header 64 bits
+//les champs ont le meme rôle que dans le header 32 bits
+struct Elf64Ehdr{
+      e_ident : [u8;EI_NIDENT],
+      e_type : Elf64_Half,
+      e_machine : Elf64_Half,
+      e_version : Elf64_Word,
+      e_entry : Elf64_Addr,
+      e_phoff : Elf64_Off,
+      e_shoff : Elf64_Off,
+      e_flags : Elf64_Word,
+      e_ehsize : Elf64_Half,
+      e_phentsize : Elf64_Half,
+      e_phnum : Elf64_Half,
+      e_shentsize : Elf64_Half,
+      e_shnum : Elf64_Half,
+      e_shstrndx : Elf64_Half
+}
+
+
+
+/* e_ident offsets */
+const EI_MAG0 : u32 = 0;
+const EI_MAG1 : u32 = 1;
+const EI_MAG2 : u32 = 2;
+const EI_MAG3 : u32 = 3;
+const EI_CLASS : u32 = 4;  
+const EI_DATA : u32 = 5;  
+const EI_VERSION : u32 = 6;  
+const EI_PAD : u32 = 7;  
+
+/* e_ident[EI_CLASS] */
+const ELFCLASSNONE : u32 = 0;
+const ELFCLASS32 : u32 = 1;
+const ELFCLASS64 : u32 = 2;
+
+/* e_ident[EI_DATA] */
+const ELFDATANONE : u32 = 0;
+const  ELFDATA2LSB : u32 = 1;
+const  ELFDATA2MSB : u32 = 2;
+
+/* e_type */
+const  ET_NONE : u32 = 0;  /* No file type       */
+const  ET_REL : u32 = 1;  /* Relocatable file   */
+const  ET_EXEC : u32 = 2;  /* Executable file    */
+const  ET_DYN : u32 = 3;  /* Shared object file */
+const  ET_CORE : u32 = 4;  /* Core file          */
+const  ET_LOPROC : u32 = 0xff00;  /* Processor-specific */
+const  ET_HIPROC : u32 = 0xffff;  /* Processor-specific */
+
+/* e_machine */
+const  EM_NONE : u32 = 0;  /* No machine     */
+const  EM_M32 : u32 = 1;  /* AT&T WE 32100  */
+const  EM_SPARC : u32 = 2;  /* SPARC          */
+const  EM_386 : u32 = 3; /* Intel 80386    */
+const  EM_68K : u32 = 4;  /* Motorola 68000 */
+const  EM_88K : u32 = 5;  /* Motorola 88000 */
+const  EM_860 : u32 = 7;  /* Intel 80860    */
+const  EM_MIPS : u32 = 8; /* MIPS R3000     */
+const  EM_RISC : u32 = 243; /* RISCV */
+
+/* e_version */
+ const EV_NONE : u32 = 0; /* invalid version */
+ const EV_CURRENT : u32 = 1; /* current version */