added ELF header and parser

2026-10-08 08:55:46 +00:00 · 2025-02-25 14:41:15 -08:00
parent 87ae363292
commit b74c304f39
4 changed files with 1254 additions and 0 deletions
@@ -0,0 +1,143 @@
+// Copyright (c) 2025 Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+////////////////////////////////
+//~ rjf: 32 => 64 bit conversions
+
+internal ELF_Hdr64
+elf_hdr64_from_hdr32(ELF_Hdr32 h32)
+{
+  ELF_Hdr64 h64  = {0};
+  MemoryCopy(h64.e_ident, h32.e_ident, sizeof(h64.e_ident));
+  h64.e_type      = h32.e_type;
+  h64.e_machine   = h32.e_machine;
+  h64.e_version   = h32.e_version;
+  h64.e_entry     = (U64)h32.e_entry;
+  h64.e_phoff     = (U64)h32.e_phoff;
+  h64.e_shoff     = (U64)h32.e_shoff;
+  h64.e_flags     = h32.e_flags;
+  h64.e_ehsize    = h32.e_ehsize;
+  h64.e_phentsize = h32.e_phentsize;
+  h64.e_phnum     = h32.e_phnum;
+  h64.e_shentsize = h32.e_shentsize;
+  h64.e_shnum     = h32.e_shnum;
+  h64.e_shstrndx  = h32.e_shstrndx;
+  return h64;
+}
+
+internal ELF_Shdr64
+elf_shdr64_from_shdr32(ELF_Shdr32 h32)
+{
+  ELF_Shdr64 h64   = {0};
+  h64.sh_name      = h32.sh_name;
+  h64.sh_type      = h32.sh_type;
+  h64.sh_flags     = (U64)h32.sh_flags;
+  h64.sh_addr      = (U64)h32.sh_addr;
+  h64.sh_offset    = (U64)h32.sh_offset;
+  h64.sh_size      = (U64)h32.sh_size;
+  h64.sh_link      = h32.sh_link;
+  h64.sh_info      = h32.sh_info;
+  h64.sh_addralign = (U64)h32.sh_addralign;
+  h64.sh_entsize   = (U64)h32.sh_entsize;
+  return h64;
+}
+
+internal ELF_Phdr64
+elf_phdr64_from_phdr32(ELF_Phdr32 h32)
+{
+  ELF_Phdr64 h64 = {0};
+  h64.p_type     = h32.p_type;
+  h64.p_flags    = h32.p_flags;
+  h64.p_offset   = (U64)h32.p_offset;
+  h64.p_vaddr    = (U64)h32.p_vaddr;
+  h64.p_paddr    = (U64)h32.p_paddr;
+  h64.p_filesz   = (U64)h32.p_filesz;
+  h64.p_memsz    = (U64)h32.p_memsz;
+  h64.p_align    = (U64)h32.p_align;
+  return h64;
+}
+
+internal ELF_Dyn64
+elf_dyn64_from_dyn32(ELF_Dyn32 h32)
+{
+  ELF_Dyn64 h64 = {0};
+  h64.tag       = (U64)h32.tag;
+  h64.val       = (U64)h32.val;
+  return h64;
+}
+
+internal ELF_Sym64
+elf_sym64_from_sym32(ELF_Sym32 sym32)
+{
+  ELF_Sym64 sym64 = {0};
+  sym64.st_name   = sym32.st_name;
+  sym64.st_value  = sym32.st_value;
+  sym64.st_size   = sym32.st_size;
+  sym64.st_info   = sym32.st_info;
+  sym64.st_other  = sym32.st_other;
+  sym64.st_shndx  = sym32.st_shndx;
+  return sym64;
+}
+
+internal ELF_Rel64
+elf_rel64_from_rel32(ELF_Rel32 rel32)
+{
+  U32 sym  = SYMS_ELF32_R_SYM(rel32.r_info);
+  U32 type = SYMS_ELF32_R_TYPE(rel32.r_info);
+  ELF_Rel64 rel64 = {0};
+  rel64.r_info    = SYMS_ELF64_R_INFO(sym, type);
+  rel64.r_offset  = rel32.r_offset;
+  return rel64;
+}
+
+internal ELF_Rela64
+elf_rela64_from_rela32(ELF_Rela32 rela32)
+{
+  U32 sym  = SYMS_ELF32_R_SYM(rela32.r_info);
+  U32 type = SYMS_ELF32_R_TYPE(rela32.r_info);
+  ELF_Rela64 rela64 = {0};
+  rela64.r_offset   = rela32.r_info;
+  rela64.r_info     = SYMS_ELF64_R_INFO(sym, type);
+  rela64.r_addend   = rela32.r_addend;
+  return rela64;
+}
+
+internal ELF_Chdr64
+elf_chdr64_from_chdr32(ELF_Chdr32 chdr32)
+{
+  ELF_Chdr64 chdr64    = {0};
+  chdr64.ch_type       = chdr32.ch_type;
+  chdr64.ch_size       = chdr32.ch_size;
+  chdr64.ch_addr_align = chdr32.ch_addr_align;
+  return chdr64;
+}
+
+////////////////////////////////
+
+internal String8
+elf_string_from_class(Arena *arena, ELF_Class v)
+{
+  switch (v) {
+  case ELF_Class_None: return str8_lit("None");
+  case ELF_Class_32:   return str8_lit("32Bit");
+  case ELF_Class_64:   return str8_lit("64Bit");
+  }
+  return push_str8f(arena, "%#x", v);
+}
+
+////////////////////////////////
+
+internal Arch
+arch_from_elf_machine(ELF_MachineKind e_machine)
+{
+  Arch arch = Arch_Null;
+  switch (e_machine) {
+  case ELF_MachineKind_None:    arch = Arch_Null;  break;
+  case ELF_MachineKind_AARCH64: arch = Arch_arm32; break;
+  case ELF_MachineKind_ARM:     arch = Arch_arm32; break;
+  case ELF_MachineKind_386:     arch = Arch_x86;   break;
+  case ELF_MachineKind_X86_64:  arch = Arch_x64;   break;
+  default: NotImplemented; break;
+  }
+  return arch;
+}