mirror of
https://github.com/upx/upx
synced 2025-09-28 19:06:07 +08:00
40fddf1715
and allow for block-by-block specification of filter and parameters. linker.cpp linker.h mem.cpp mem.h p_elf.h p_lx_elf.cpp p_lx_elf.h p_lx_exc.cpp p_lx_exc.h p_lx_sh.cpp p_lx_sh.h p_unix.cpp p_unix.h packer.cpp packer.h stub/fold_elf86.asm stub/fold_exec86.asm stub/fold_sh86.asm stub/l_lx_elf.c stub/l_lx_elf86.asm stub/l_lx_elf86.lds stub/l_lx_exec.c stub/l_lx_exec86.asm stub/l_lx_exec86.lds stub/l_lx_sh.c stub/l_lx_sh86.asm stub/l_lx_sh86.lds stub/linux.hh committer: jreiser <jreiser> 981084316 +0000
134 lines
4.2 KiB
NASM
134 lines
4.2 KiB
NASM
; fold_elf86.asm -- linkage to C code to process Elf binary
|
|
;
|
|
; This file is part of the UPX executable compressor.
|
|
;
|
|
; Copyright (C) 2000-2001 John F. Reiser
|
|
; All Rights Reserved.
|
|
;
|
|
; UPX and the UCL library are free software; you can redistribute them
|
|
; and/or modify them under the terms of the GNU General Public License as
|
|
; published by the Free Software Foundation; either version 2 of
|
|
; the License, or (at your option) any later version.
|
|
;
|
|
; This program is distributed in the hope that it will be useful,
|
|
; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
; GNU General Public License for more details.
|
|
;
|
|
; You should have received a copy of the GNU General Public License
|
|
; along with this program; see the file COPYING.
|
|
; If not, write to the Free Software Foundation, Inc.,
|
|
; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
;
|
|
; Markus F.X.J. Oberhumer Laszlo Molnar John F. Reiser
|
|
; markus@oberhumer.com ml1050@cdata.tvnet.hu jreiser@BitWagon.com
|
|
;
|
|
|
|
%define szElf32_Ehdr 0x34
|
|
%define szElf32_Phdr 8*4
|
|
%define e_entry (16 + 2*2 + 4)
|
|
%define p_memsz 5*4
|
|
%define szl_info 12
|
|
%define szp_info 12
|
|
%define a_val 4
|
|
|
|
%define __NR_munmap 91
|
|
|
|
;; control just falls through, after this part and compiled C code
|
|
;; are uncompressed.
|
|
|
|
fold_begin: ; enter: %ebx= &Elf32_Ehdr of this program
|
|
; patchLoader will modify to be
|
|
; dword sz_uncompressed, sz_compressed
|
|
; byte compressed_data...
|
|
|
|
pop eax ; discard &sz_uncompressed
|
|
pop eax ; discard sz_uncompressed
|
|
|
|
; Move argc,argv,envp down so that we can insert more Elf_auxv entries.
|
|
; ld-linux.so.2 depends on AT_PHDR and AT_ENTRY, for instance
|
|
|
|
%define PAGE_SIZE ( 1<<12)
|
|
%define OVERHEAD 2048
|
|
%define MAX_ELF_HDR 512
|
|
|
|
mov esi, esp
|
|
sub esp, byte 6*8 ; AT_PHENT, AT_PHNUM, AT_PAGESZ, AT_ENTRY, AT_PHDR, AT_NULL
|
|
mov edi, esp
|
|
call do_auxv
|
|
|
|
mov eax, [p_memsz + 2*szElf32_Phdr + szElf32_Ehdr + ebx] ; size of PT_DYNAMIC
|
|
sub esp, dword MAX_ELF_HDR + OVERHEAD
|
|
mov ecx, [e_entry + ebx] ; beyond compressed data
|
|
push esp ; argument: temp space
|
|
lea eax, [szElf32_Ehdr + 3*szElf32_Phdr + szl_info + szp_info + ebx + eax] ; 1st &b_info
|
|
push edi ; argument: AT_next
|
|
sub ecx, eax ; length of compressed data
|
|
push ebp ; argument: &decompress
|
|
push ecx ; argument: sz_compressed
|
|
push eax ; argument: 1st &b_info
|
|
EXTERN upx_main
|
|
call upx_main ; entry = upx_main(b1st_info, sz_cpr, &decompress, AT_next, tmp_ehdr)
|
|
add esp, dword 5*4 + MAX_ELF_HDR + OVERHEAD ; remove 5 params, temp space
|
|
push eax ; save entry address
|
|
|
|
mov edi, [a_val + edi] ; AT_PHDR
|
|
find_hatch:
|
|
push edi
|
|
EXTERN make_hatch
|
|
call make_hatch ; find hatch = make_hatch(phdr)
|
|
pop ecx ; junk the parameter
|
|
add edi, byte szElf32_Phdr ; prepare to try next Elf32_Phdr
|
|
test eax,eax
|
|
jz find_hatch
|
|
xchg eax,edx ; edx= &hatch
|
|
|
|
; _dl_start and company (ld-linux.so.2) assumes that it has virgin stack,
|
|
; and does not initialize all its stack local variables to zero.
|
|
; Ulrich Drepper (drepper@cyngus.com) has refused to fix the bugs.
|
|
; See GNU wwwgnats libc/1165 .
|
|
|
|
%define N_STKCLR (0x100 + MAX_ELF_HDR + OVERHEAD)/4
|
|
lea edi, [esp - 4*N_STKCLR]
|
|
pusha ; values will be zeroed
|
|
mov ecx, N_STKCLR
|
|
xor eax,eax
|
|
rep stosd
|
|
|
|
xor ecx, ecx ; 0
|
|
mov ch, PAGE_SIZE>>8 ; 0x1000
|
|
add ecx, [p_memsz + szElf32_Ehdr + ebx] ; length to unmap
|
|
mov bh, 0 ; from 0x401000 to 0x400000
|
|
push byte __NR_munmap
|
|
pop eax
|
|
jmp edx ; unmap ourselves via escape hatch, then goto entry
|
|
|
|
do_auxv: ; entry: %esi=src = &argc; %edi=dst. exit: %edi= &AT_NULL
|
|
; cld
|
|
|
|
L10: ; move argc+argv
|
|
lodsd
|
|
stosd
|
|
test eax,eax
|
|
jne L10
|
|
|
|
L20: ; move envp
|
|
lodsd
|
|
stosd
|
|
test eax,eax
|
|
jne L20
|
|
|
|
L30: ; move existing Elf32_auxv
|
|
lodsd
|
|
stosd
|
|
test eax,eax ; AT_NULL ?
|
|
lodsd
|
|
stosd
|
|
jne L30
|
|
|
|
sub edi, byte 8 ; point to AT_NULL
|
|
ret
|
|
|
|
; vi:ts=8:et:nowrap
|
|
|