stuff

TTOS/include/elf.h

@@ -0,0 +1,232 @@
+#ifndef _ELF_H
+#define _ELF_H
+
+#include <stdint.h>
+
+#include "errorCode.h"
+
+/* https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html */
+
+/* ELF Data Types */
+typedef uint32_t Elf32_Addr;
+typedef uint32_t Elf32_Off;
+typedef uint16_t Elf32_Half;
+typedef uint32_t Elf32_Word;
+typedef int32_t Elf32_Sword;
+
+typedef uint64_t Elf64_Addr;
+typedef uint64_t Elf64_Off;
+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;
+
+/* ELF Magic */
+#define ELFMAG0 0x7f
+#define ELFMAG1 'E'
+#define ELFMAG2 'L'
+#define ELFMAG3 'F'
+
+/* Class */
+#define ELFCLASSNONE 0
+#define ELFCLASS32   1
+#define ELFCLASS64   2
+
+/* Data encoding */
+#define ELFDATANONE 0
+#define ELFDATA2LSB 1
+#define ELFDATA2MSB 2
+
+/* Version */
+#define EV_NONE    0
+#define EV_CURRENT 1
+
+/* Type */
+#define ET_NONE   0
+#define ET_REL    1
+#define ET_EXEC   2
+#define ET_DYN    3
+#define ET_CORE   4
+#define ET_LOOS   0xfe00
+#define ET_HIOS   0xfeff
+#define ET_LOPROC 0xff00
+#define ET_HIPROC 0xffff
+
+#define EI_NIDENT 16
+
+typedef struct {
+    uint8_t         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;
+
+/* Program header types */
+#define PT_NULL     0
+#define PT_LOAD     1
+#define PT_DYNAMIC  2
+#define PT_INTERP   3
+#define PT_NOTE     4
+#define PT_SHLIB    5
+#define PT_PHDR     6
+#define PT_TLS      7
+#define PT_LOOS     0x60000000
+#define PT_HIOS     0x6fffffff
+#define PT_LOPROC   0x70000000
+#define PT_HIPROC   0x7fffffff
+
+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;
+
+/* Section header type */
+#define SHT_NULL          0
+#define SHT_PROGBITS      1
+#define SHT_SYMTAB        2
+#define SHT_STRTAB        3
+#define SHT_RELA          4
+#define SHT_HASH          5
+#define SHT_DYNAMIC       6
+#define SHT_NOTE          7
+#define SHT_NOBITS        8
+#define SHT_REL           9
+#define SHT_SHLIB         10
+#define SHT_DYNSYM        11
+#define SHT_INIT_ARRAY    14
+#define SHT_FINI_ARRAY    15
+#define SHT_PREINIT_ARRAY 16
+#define SHT_GROUP         17
+#define SHT_SYMTAB_SHNDX  18
+#define SHT_LOOS          0x60000000
+#define SHT_HIOS          0x6fffffff
+#define SHT_LOPROC        0x70000000
+#define SHT_HIPROC        0x7fffffff
+#define SHT_LOUSER        0x80000000
+#define SHT_HIUSER        0xffffffff
+
+/* Section header name index */
+#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
+
+/* Section header flags */
+#define SHF_WRITE       0x1
+#define SHF_ALLOC       0x2
+#define SHF_EXECINSTR   0x4
+#define SHF_MERGE       0x10
+#define SHF_STRINGS     0x20
+#define SHF_INFO_LINK   0x40
+#define SHF_LINK_ORDER  0x80
+#define SHF_OS_NONCONFORMING 0x100
+#define SHF_GROUP       0x200
+#define SHF_TLS         0x400
+#define SHF_MASKOS      0x0ff00000
+#define SHF_MASKPROC    0xf0000000
+
+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;
+
+/* Symbol table index values */
+#define STN_UNDEF   0
+
+typedef struct {
+    Elf64_Word      st_name;
+    uint8_t         st_info;
+    uint8_t         st_other;
+    Elf64_Half      st_shndx;
+    Elf64_Addr      st_value;
+    Elf64_Xword     st_size;
+} Elf64_Sym;
+
+typedef struct {
+    Elf64_Addr      r_offset;
+    Elf64_Xword     r_info;
+} Elf64_Rel;
+
+typedef struct {
+    Elf64_Addr      r_offset;
+    Elf64_Xword     r_info;
+    Elf64_Sxword    r_addend;
+} Elf64_Rela;
+
+#define R_X86_64_NONE       0
+#define R_X86_64_64         1
+#define R_X86_64_PC32       2
+#define R_X86_64_GOT32      3
+#define R_X86_64_PLT32      4
+#define R_X86_64_COPY       5
+#define R_X86_64_GLOB_DAT   6
+#define R_X86_64_JUMP_SLOT  7
+#define R_X86_64_RELATIVE   8
+#define R_X86_64_GOTPCREL   9
+#define R_X86_64_32         10
+#define R_X86_64_32S        11
+#define R_X86_64_16         12
+#define R_X86_64_PC16       13
+#define R_X86_64_8          14
+#define R_X86_64_PC8        15
+#define R_X86_64_DPTMOD64   16
+#define R_X86_64_DTPOFF64   17
+#define R_X86_64_TPOFF64    18
+#define R_X86_64_TLSGD      19
+#define R_X86_64_TLSLD      20
+#define R_X86_64_DTPOFF32   21
+#define R_X86_64_GOTTPOFF   22
+#define R_X86_64_TPOFF32    23
+#define R_X86_64_PC64       24
+#define R_X86_64_GOTOFF64   25
+#define R_X86_64_GOTPC32    26
+#define R_X86_64_SIZE32     32
+#define R_X86_64_SIZE64     33
+
+#define ELF64_R_SYM(i)    ((i)>>32)
+#define ELF64_R_TYPE(i)   ((i)&0xffffffffL)
+#define ELF64_R_INFO(s,t) (((s)<<32)+((t)&0xffffffffL))
+
+typedef struct elf_file {
+    int size;
+    void* contents;
+    Elf64_Ehdr* ehdr;
+    Elf64_Phdr* phdr;
+    Elf64_Shdr* shdr;
+} elf_file;
+
+errorCode_t load_elf(const char* filename, elf_file* file);
+errorCode_t get_elf_proc_size(elf_file* file, uint64_t* size);
+errorCode_t populate_elf_proc(elf_file* file, void* tgt_addr);
+errorCode_t find_symbol(elf_file* file, const char* name, uint64_t* offset);
+errorCode_t free_elf(elf_file* file);
+
+#endif