655 lines
17 KiB
Plaintext
655 lines
17 KiB
Plaintext
(*
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BSD 2-Clause License
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Copyright (c) 2019, Anton Krotov
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All rights reserved.
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*)
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MODULE ELF;
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IMPORT BIN, WR := WRITER, CHL := CHUNKLISTS, LISTS;
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CONST
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EI_NIDENT = 16;
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ET_EXEC = 2;
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ET_DYN = 3;
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EM_386 = 3;
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EM_8664 = 3EH;
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ELFCLASS32 = 1;
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ELFCLASS64 = 2;
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ELFDATA2LSB = 1;
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ELFDATA2MSB = 2;
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PF_X = 1;
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PF_W = 2;
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PF_R = 4;
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TYPE
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Elf32_Ehdr = RECORD
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e_ident: ARRAY EI_NIDENT OF BYTE;
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e_type,
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e_machine: WCHAR;
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e_version,
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e_entry,
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e_phoff,
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e_shoff,
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e_flags: INTEGER;
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e_ehsize,
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e_phentsize,
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e_phnum,
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e_shentsize,
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e_shnum,
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e_shstrndx: WCHAR
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END;
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Elf32_Phdr = RECORD
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p_type,
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p_offset,
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p_vaddr,
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p_paddr,
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p_filesz,
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p_memsz,
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p_flags,
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p_align: INTEGER
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END;
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Elf32_Dyn = POINTER TO RECORD (LISTS.ITEM)
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d_tag, d_val: INTEGER
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END;
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Elf32_Sym = POINTER TO RECORD (LISTS.ITEM)
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name, value, size: INTEGER;
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info, other: CHAR;
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shndx: WCHAR
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END;
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FILE = WR.FILE;
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VAR
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dynamic: LISTS.LIST;
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strtab: CHL.BYTELIST;
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symtab: LISTS.LIST;
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hashtab, bucket, chain: CHL.INTLIST;
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PROCEDURE align (n, _align: INTEGER): INTEGER;
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BEGIN
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IF n MOD _align # 0 THEN
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n := n + _align - (n MOD _align)
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END
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RETURN n
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END align;
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PROCEDURE Write16 (file: FILE; w: WCHAR);
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BEGIN
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WR.Write16LE(file, ORD(w))
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END Write16;
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PROCEDURE WritePH (file: FILE; ph: Elf32_Phdr);
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BEGIN
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WR.Write32LE(file, ph.p_type);
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WR.Write32LE(file, ph.p_offset);
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WR.Write32LE(file, ph.p_vaddr);
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WR.Write32LE(file, ph.p_paddr);
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WR.Write32LE(file, ph.p_filesz);
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WR.Write32LE(file, ph.p_memsz);
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WR.Write32LE(file, ph.p_flags);
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WR.Write32LE(file, ph.p_align)
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END WritePH;
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PROCEDURE WritePH64 (file: FILE; ph: Elf32_Phdr);
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BEGIN
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WR.Write32LE(file, ph.p_type);
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WR.Write32LE(file, ph.p_flags);
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WR.Write64LE(file, ph.p_offset);
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WR.Write64LE(file, ph.p_vaddr);
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WR.Write64LE(file, ph.p_paddr);
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WR.Write64LE(file, ph.p_filesz);
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WR.Write64LE(file, ph.p_memsz);
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WR.Write64LE(file, ph.p_align)
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END WritePH64;
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PROCEDURE fixup (program: BIN.PROGRAM; text, data, bss: INTEGER; amd64: BOOLEAN);
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VAR
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reloc: BIN.RELOC;
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code: CHL.BYTELIST;
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L, delta, delta0: INTEGER;
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BEGIN
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code := program.code;
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delta0 := 3 - 7 * ORD(amd64);
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reloc := program.rel_list.first(BIN.RELOC);
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WHILE reloc # NIL DO
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L := BIN.get32le(code, reloc.offset);
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delta := delta0 - reloc.offset - text;
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CASE reloc.opcode OF
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|BIN.PICDATA: BIN.put32le(code, reloc.offset, L + data + delta)
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|BIN.PICCODE: BIN.put32le(code, reloc.offset, BIN.GetLabel(program, L) + text + delta)
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|BIN.PICBSS: BIN.put32le(code, reloc.offset, L + bss + delta)
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END;
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reloc := reloc.next(BIN.RELOC)
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END
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END fixup;
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PROCEDURE NewDyn (tag, val: INTEGER);
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VAR
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dyn: Elf32_Dyn;
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BEGIN
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NEW(dyn);
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dyn.d_tag := tag;
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dyn.d_val := val;
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LISTS.push(dynamic, dyn)
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END NewDyn;
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PROCEDURE NewSym (name, value, size: INTEGER; info, other: CHAR; shndx: WCHAR);
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VAR
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sym: Elf32_Sym;
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BEGIN
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NEW(sym);
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sym.name := name;
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sym.value := value;
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sym.size := size;
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sym.info := info;
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sym.other := other;
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sym.shndx := shndx;
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LISTS.push(symtab, sym)
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END NewSym;
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PROCEDURE HashStr (name: ARRAY OF CHAR): INTEGER;
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VAR
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i, h: INTEGER;
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g: SET;
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BEGIN
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h := 0;
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i := 0;
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WHILE name[i] # 0X DO
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h := h * 16 + ORD(name[i]);
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g := BITS(h) * {28..31};
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h := ORD(BITS(h) / BITS(LSR(ORD(g), 24)) - g);
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INC(i)
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END
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RETURN h
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END HashStr;
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PROCEDURE MakeHash (bucket, chain: CHL.INTLIST; symCount: INTEGER);
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VAR
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symi, hi, k: INTEGER;
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BEGIN
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FOR symi := 0 TO symCount - 1 DO
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CHL.SetInt(chain, symi, 0);
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hi := CHL.GetInt(hashtab, symi) MOD symCount;
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IF CHL.GetInt(bucket, hi) # 0 THEN
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k := symi;
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WHILE CHL.GetInt(chain, k) # 0 DO
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k := CHL.GetInt(chain, k)
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END;
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CHL.SetInt(chain, k, CHL.GetInt(bucket, hi))
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END;
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CHL.SetInt(bucket, hi, symi)
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END
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END MakeHash;
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PROCEDURE write* (program: BIN.PROGRAM; FileName: ARRAY OF CHAR; fini: INTEGER; so, amd64: BOOLEAN);
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CONST
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interp = 0;
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dyn = 1;
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header = 2;
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text = 3;
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data = 4;
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bss = 5;
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linuxInterpreter64 = "/lib64/ld-linux-x86-64.so.2";
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linuxInterpreter32 = "/lib/ld-linux.so.2";
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exeBaseAddress32 = 8048000H;
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exeBaseAddress64 = 400000H;
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dllBaseAddress = 0;
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DT_NULL = 0;
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DT_NEEDED = 1;
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DT_HASH = 4;
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DT_STRTAB = 5;
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DT_SYMTAB = 6;
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DT_RELA = 7;
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DT_RELASZ = 8;
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DT_RELAENT = 9;
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DT_STRSZ = 10;
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DT_SYMENT = 11;
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DT_INIT = 12;
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DT_FINI = 13;
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DT_SONAME = 14;
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DT_REL = 17;
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DT_RELSZ = 18;
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DT_RELENT = 19;
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VAR
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ehdr: Elf32_Ehdr;
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phdr: ARRAY 16 OF Elf32_Phdr;
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i, BaseAdr, offset, pad, VA, symCount: INTEGER;
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SizeOf: RECORD header, code, data, bss: INTEGER END;
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Offset: RECORD symtab, reltab, hash, strtab, dyn: INTEGER END;
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File: FILE;
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Interpreter: ARRAY 40 OF CHAR; lenInterpreter: INTEGER;
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item: LISTS.ITEM;
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Name: ARRAY 2048 OF CHAR;
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BEGIN
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dynamic := LISTS.create(NIL);
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symtab := LISTS.create(NIL);
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strtab := CHL.CreateByteList();
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IF amd64 THEN
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BaseAdr := exeBaseAddress64;
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Interpreter := linuxInterpreter64
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ELSE
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BaseAdr := exeBaseAddress32;
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Interpreter := linuxInterpreter32
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END;
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IF so THEN
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BaseAdr := dllBaseAddress
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END;
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lenInterpreter := LENGTH(Interpreter) + 1;
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SizeOf.code := CHL.Length(program.code);
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SizeOf.data := CHL.Length(program.data);
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SizeOf.bss := program.bss;
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ehdr.e_ident[0] := 7FH;
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ehdr.e_ident[1] := ORD("E");
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ehdr.e_ident[2] := ORD("L");
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ehdr.e_ident[3] := ORD("F");
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IF amd64 THEN
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ehdr.e_ident[4] := ELFCLASS64
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ELSE
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ehdr.e_ident[4] := ELFCLASS32
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END;
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ehdr.e_ident[5] := ELFDATA2LSB;
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ehdr.e_ident[6] := 1;
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ehdr.e_ident[7] := 3;
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FOR i := 8 TO EI_NIDENT - 1 DO
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ehdr.e_ident[i] := 0
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END;
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IF so THEN
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ehdr.e_type := WCHR(ET_DYN)
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ELSE
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ehdr.e_type := WCHR(ET_EXEC)
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END;
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ehdr.e_version := 1;
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ehdr.e_shoff := 0;
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ehdr.e_flags := 0;
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ehdr.e_shnum := WCHR(0);
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ehdr.e_shstrndx := WCHR(0);
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ehdr.e_phnum := WCHR(6);
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IF amd64 THEN
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ehdr.e_machine := WCHR(EM_8664);
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ehdr.e_phoff := 40H;
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ehdr.e_ehsize := WCHR(40H);
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ehdr.e_phentsize := WCHR(38H);
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ehdr.e_shentsize := WCHR(40H)
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ELSE
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ehdr.e_machine := WCHR(EM_386);
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ehdr.e_phoff := 34H;
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ehdr.e_ehsize := WCHR(34H);
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ehdr.e_phentsize := WCHR(20H);
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ehdr.e_shentsize := WCHR(28H)
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END;
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SizeOf.header := ORD(ehdr.e_ehsize) + ORD(ehdr.e_phentsize) * ORD(ehdr.e_phnum);
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phdr[interp].p_type := 3;
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phdr[interp].p_offset := SizeOf.header;
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phdr[interp].p_vaddr := BaseAdr + phdr[interp].p_offset;
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phdr[interp].p_paddr := phdr[interp].p_vaddr;
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phdr[interp].p_filesz := lenInterpreter;
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phdr[interp].p_memsz := lenInterpreter;
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phdr[interp].p_flags := PF_R;
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phdr[interp].p_align := 1;
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phdr[dyn].p_type := 2;
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phdr[dyn].p_offset := phdr[interp].p_offset + phdr[interp].p_filesz;
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phdr[dyn].p_vaddr := BaseAdr + phdr[dyn].p_offset;
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phdr[dyn].p_paddr := phdr[dyn].p_vaddr;
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hashtab := CHL.CreateIntList();
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CHL.PushInt(hashtab, HashStr(""));
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NewSym(CHL.PushStr(strtab, ""), 0, 0, 0X, 0X, 0X);
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CHL.PushInt(hashtab, HashStr("dlopen"));
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NewSym(CHL.PushStr(strtab, "dlopen"), 0, 0, 12X, 0X, 0X);
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CHL.PushInt(hashtab, HashStr("dlsym"));
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NewSym(CHL.PushStr(strtab, "dlsym"), 0, 0, 12X, 0X, 0X);
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IF so THEN
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item := program.exp_list.first;
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WHILE item # NIL DO
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ASSERT(CHL.GetStr(program.export, item(BIN.EXPRT).nameoffs, Name));
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CHL.PushInt(hashtab, HashStr(Name));
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NewSym(CHL.PushStr(strtab, Name), item(BIN.EXPRT).label, 0, 12X, 0X, 0X);
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item := item.next
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END;
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ASSERT(CHL.GetStr(program.data, program.modname, Name))
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END;
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symCount := LISTS.count(symtab);
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bucket := CHL.CreateIntList();
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chain := CHL.CreateIntList();
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FOR i := 1 TO symCount DO
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CHL.PushInt(bucket, 0);
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CHL.PushInt(chain, 0)
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END;
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MakeHash(bucket, chain, symCount);
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NewDyn(DT_NEEDED, CHL.PushStr(strtab, "libdl.so.2"));
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NewDyn(DT_STRTAB, 0);
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NewDyn(DT_STRSZ, CHL.Length(strtab));
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NewDyn(DT_SYMTAB, 0);
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IF amd64 THEN
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NewDyn(DT_SYMENT, 24);
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NewDyn(DT_RELA, 0);
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NewDyn(DT_RELASZ, 48);
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NewDyn(DT_RELAENT, 24)
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ELSE
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NewDyn(DT_SYMENT, 16);
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NewDyn(DT_REL, 0);
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NewDyn(DT_RELSZ, 16);
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NewDyn(DT_RELENT, 8)
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END;
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NewDyn(DT_HASH, 0);
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IF so THEN
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NewDyn(DT_SONAME, CHL.PushStr(strtab, Name));
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NewDyn(DT_INIT, 0);
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NewDyn(DT_FINI, 0)
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END;
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NewDyn(DT_NULL, 0);
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Offset.symtab := LISTS.count(dynamic) * (8 + 8 * ORD(amd64));
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Offset.reltab := Offset.symtab + symCount * (16 + 8 * ORD(amd64));
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Offset.hash := Offset.reltab + (8 + 16 * ORD(amd64)) * 2;
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Offset.strtab := Offset.hash + (symCount * 2 + 2) * 4;
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Offset.dyn := phdr[dyn].p_offset;
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item := LISTS.getidx(dynamic, 1); item(Elf32_Dyn).d_val := Offset.strtab + Offset.dyn + BaseAdr;
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item := LISTS.getidx(dynamic, 3); item(Elf32_Dyn).d_val := Offset.symtab + Offset.dyn + BaseAdr;
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item := LISTS.getidx(dynamic, 5); item(Elf32_Dyn).d_val := Offset.reltab + Offset.dyn + BaseAdr;
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item := LISTS.getidx(dynamic, 8); item(Elf32_Dyn).d_val := Offset.hash + Offset.dyn + BaseAdr;
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phdr[dyn].p_filesz := Offset.strtab + CHL.Length(strtab) + 8 + 8 * ORD(amd64);
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phdr[dyn].p_memsz := phdr[dyn].p_filesz;
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phdr[dyn].p_flags := PF_R;
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phdr[dyn].p_align := 1;
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offset := 0;
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phdr[header].p_type := 1;
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phdr[header].p_offset := offset;
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phdr[header].p_vaddr := BaseAdr;
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phdr[header].p_paddr := BaseAdr;
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phdr[header].p_filesz := 244 + 156 * ORD(amd64) + lenInterpreter + phdr[dyn].p_filesz;
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phdr[header].p_memsz := phdr[header].p_filesz;
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phdr[header].p_flags := PF_R + PF_W;
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phdr[header].p_align := 1000H;
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offset := offset + phdr[header].p_filesz;
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VA := BaseAdr + offset + 1000H;
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phdr[text].p_type := 1;
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phdr[text].p_offset := offset;
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phdr[text].p_vaddr := VA;
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phdr[text].p_paddr := VA;
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phdr[text].p_filesz := SizeOf.code;
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phdr[text].p_memsz := SizeOf.code;
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phdr[text].p_flags := PF_X + PF_R;
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phdr[text].p_align := 1000H;
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ehdr.e_entry := phdr[text].p_vaddr;
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offset := offset + phdr[text].p_filesz;
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VA := BaseAdr + offset + 2000H;
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pad := (16 - VA MOD 16) MOD 16;
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phdr[data].p_type := 1;
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phdr[data].p_offset := offset;
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phdr[data].p_vaddr := VA;
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phdr[data].p_paddr := VA;
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phdr[data].p_filesz := SizeOf.data + pad;
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phdr[data].p_memsz := SizeOf.data + pad;
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phdr[data].p_flags := PF_R + PF_W;
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phdr[data].p_align := 1000H;
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offset := offset + phdr[data].p_filesz;
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VA := BaseAdr + offset + 3000H;
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phdr[bss].p_type := 1;
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phdr[bss].p_offset := offset;
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phdr[bss].p_vaddr := VA;
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phdr[bss].p_paddr := VA;
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phdr[bss].p_filesz := 0;
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phdr[bss].p_memsz := SizeOf.bss + 16;
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phdr[bss].p_flags := PF_R + PF_W;
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phdr[bss].p_align := 1000H;
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fixup(program, ehdr.e_entry, phdr[data].p_vaddr + pad, align(phdr[bss].p_vaddr, 16), amd64);
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item := symtab.first;
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WHILE item # NIL DO
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IF item(Elf32_Sym).value # 0 THEN
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INC(item(Elf32_Sym).value, ehdr.e_entry)
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END;
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item := item.next
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END;
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IF so THEN
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item := LISTS.getidx(dynamic, 10); item(Elf32_Dyn).d_val := ehdr.e_entry;
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item := LISTS.getidx(dynamic, 11); item(Elf32_Dyn).d_val := BIN.GetLabel(program, fini) + ehdr.e_entry
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END;
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File := WR.Create(FileName);
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FOR i := 0 TO EI_NIDENT - 1 DO
|
|
WR.WriteByte(File, ehdr.e_ident[i])
|
|
END;
|
|
|
|
Write16(File, ehdr.e_type);
|
|
Write16(File, ehdr.e_machine);
|
|
|
|
WR.Write32LE(File, ehdr.e_version);
|
|
IF amd64 THEN
|
|
WR.Write64LE(File, ehdr.e_entry);
|
|
WR.Write64LE(File, ehdr.e_phoff);
|
|
WR.Write64LE(File, ehdr.e_shoff)
|
|
ELSE
|
|
WR.Write32LE(File, ehdr.e_entry);
|
|
WR.Write32LE(File, ehdr.e_phoff);
|
|
WR.Write32LE(File, ehdr.e_shoff)
|
|
END;
|
|
WR.Write32LE(File, ehdr.e_flags);
|
|
|
|
Write16(File, ehdr.e_ehsize);
|
|
Write16(File, ehdr.e_phentsize);
|
|
Write16(File, ehdr.e_phnum);
|
|
Write16(File, ehdr.e_shentsize);
|
|
Write16(File, ehdr.e_shnum);
|
|
Write16(File, ehdr.e_shstrndx);
|
|
|
|
IF amd64 THEN
|
|
WritePH64(File, phdr[interp]);
|
|
WritePH64(File, phdr[dyn]);
|
|
WritePH64(File, phdr[header]);
|
|
WritePH64(File, phdr[text]);
|
|
WritePH64(File, phdr[data]);
|
|
WritePH64(File, phdr[bss])
|
|
ELSE
|
|
WritePH(File, phdr[interp]);
|
|
WritePH(File, phdr[dyn]);
|
|
WritePH(File, phdr[header]);
|
|
WritePH(File, phdr[text]);
|
|
WritePH(File, phdr[data]);
|
|
WritePH(File, phdr[bss])
|
|
END;
|
|
|
|
FOR i := 0 TO lenInterpreter - 1 DO
|
|
WR.WriteByte(File, ORD(Interpreter[i]))
|
|
END;
|
|
|
|
i := 0;
|
|
IF amd64 THEN
|
|
item := dynamic.first;
|
|
WHILE item # NIL DO
|
|
WR.Write64LE(File, item(Elf32_Dyn).d_tag);
|
|
WR.Write64LE(File, item(Elf32_Dyn).d_val);
|
|
item := item.next
|
|
END;
|
|
|
|
item := symtab.first;
|
|
WHILE item # NIL DO
|
|
WR.Write32LE(File, item(Elf32_Sym).name);
|
|
WR.WriteByte(File, ORD(item(Elf32_Sym).info));
|
|
WR.WriteByte(File, ORD(item(Elf32_Sym).other));
|
|
Write16(File, item(Elf32_Sym).shndx);
|
|
WR.Write64LE(File, item(Elf32_Sym).value);
|
|
WR.Write64LE(File, item(Elf32_Sym).size);
|
|
item := item.next
|
|
END;
|
|
|
|
WR.Write64LE(File, phdr[dyn].p_filesz + Offset.dyn + BaseAdr - 16);
|
|
WR.Write32LE(File, 1);
|
|
WR.Write32LE(File, 1);
|
|
WR.Write64LE(File, 0);
|
|
WR.Write64LE(File, phdr[dyn].p_filesz + Offset.dyn + BaseAdr - 8);
|
|
WR.Write32LE(File, 1);
|
|
WR.Write32LE(File, 2);
|
|
WR.Write64LE(File, 0);
|
|
|
|
WR.Write32LE(File, symCount);
|
|
WR.Write32LE(File, symCount);
|
|
|
|
FOR i := 0 TO symCount - 1 DO
|
|
WR.Write32LE(File, CHL.GetInt(bucket, i))
|
|
END;
|
|
|
|
FOR i := 0 TO symCount - 1 DO
|
|
WR.Write32LE(File, CHL.GetInt(chain, i))
|
|
END;
|
|
|
|
CHL.WriteToFile(File, strtab);
|
|
WR.Write64LE(File, 0);
|
|
WR.Write64LE(File, 0)
|
|
|
|
ELSE
|
|
item := dynamic.first;
|
|
WHILE item # NIL DO
|
|
WR.Write32LE(File, item(Elf32_Dyn).d_tag);
|
|
WR.Write32LE(File, item(Elf32_Dyn).d_val);
|
|
item := item.next
|
|
END;
|
|
|
|
item := symtab.first;
|
|
WHILE item # NIL DO
|
|
WR.Write32LE(File, item(Elf32_Sym).name);
|
|
WR.Write32LE(File, item(Elf32_Sym).value);
|
|
WR.Write32LE(File, item(Elf32_Sym).size);
|
|
WR.WriteByte(File, ORD(item(Elf32_Sym).info));
|
|
WR.WriteByte(File, ORD(item(Elf32_Sym).other));
|
|
Write16(File, item(Elf32_Sym).shndx);
|
|
item := item.next
|
|
END;
|
|
|
|
WR.Write32LE(File, phdr[dyn].p_filesz + Offset.dyn + BaseAdr - 8);
|
|
WR.Write32LE(File, 00000101H);
|
|
WR.Write32LE(File, phdr[dyn].p_filesz + Offset.dyn + BaseAdr - 4);
|
|
WR.Write32LE(File, 00000201H);
|
|
|
|
WR.Write32LE(File, symCount);
|
|
WR.Write32LE(File, symCount);
|
|
|
|
FOR i := 0 TO symCount - 1 DO
|
|
WR.Write32LE(File, CHL.GetInt(bucket, i))
|
|
END;
|
|
|
|
FOR i := 0 TO symCount - 1 DO
|
|
WR.Write32LE(File, CHL.GetInt(chain, i))
|
|
END;
|
|
|
|
CHL.WriteToFile(File, strtab);
|
|
WR.Write32LE(File, 0);
|
|
WR.Write32LE(File, 0)
|
|
|
|
END;
|
|
|
|
CHL.WriteToFile(File, program.code);
|
|
WHILE pad > 0 DO
|
|
WR.WriteByte(File, 0);
|
|
DEC(pad)
|
|
END;
|
|
CHL.WriteToFile(File, program.data);
|
|
WR.Close(File)
|
|
END write;
|
|
|
|
|
|
END ELF. |