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Put upx stub loader at high end of ELF output file on linux,

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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
This commit is contained in:
John Reiser
2001-02-02 03:25:16 +00:00
parent 9005e50049
commit 40fddf1715
28 changed files with 797 additions and 614 deletions
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src/stub/l_lx_exec86.asm
+38 -33
View File
@@ -138,49 +138,53 @@ decompress:
;__LEXEC020__
%define PAGE_MASK (~0<<12)
%define PAGE_SIZE ( 1<<12)
%define MAP_FIXED 0x10
%define MAP_PRIVATE 0x02
%define MAP_ANONYMOUS 0x20
%define PROT_READ 1
%define PROT_WRITE 2
%define PROT_EXEC 4
%define __NR_mmap 90
; Decompress the rest of this loader, and jump to it
unfold:
pop esi ; &{ sz_uncompressed, sz_compressed, compressed_data...}
mov ecx, PAGE_MASK
push esi ; &dst
mov ebx, ebp ; &decompress
and ebx, ecx ; &my_elfhdr
neg ecx ; ecx= PAGE_SIZE
cld
lodsd ; sz_uncompressed
lodsd ; sz_compressed
lodsd
push eax ; sz_uncompressed (junk, actually)
push esp ; &sz_uncompressed
mov eax, 0x400000
push eax ; &destination
;; Compressed code now begins at fold_begin.
;; We want decompressed code to begin at fold_begin, too.
;; Move the compressed code to the high end of the page.
;; Assume non-overlapping so that forward movsb is OK.
lea edi, [ecx + ebx] ; high end of page
push eax ; srclen (of both movsb and decompress)
sub edi, eax ; dst of movsb
push edi ; &src for decompression (after movsb)
xchg ecx, eax ; ecx= len of movsb
rep movsb
call ebp ; decompress(&src, srclen, &dst, &dstlen)
pop eax ; discard &src
pop eax ; discard srclen
pop eax ; &dst == fold_begin
;; icache lookahead of compressed code after "call unfold" is still there.
;; Synchronize with dcache of decompressed code.
pushf
push cs
push eax
iret ; back to fold_begin!
; mmap a page to hold the decompressed program
xor ecx, ecx
push ecx
push ecx
mov ch, PAGE_SIZE >> 8
push byte MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS
push byte PROT_READ | PROT_WRITE | PROT_EXEC
push ecx ; length
push eax ; destination
mov ebx, esp ; address of parameter vector for __NR_mmap
push byte __NR_mmap
pop eax
int 0x80
xchg eax, ebx
mov bh, PAGE_SIZE>>8 ; ebx= 0x401000
add esp, byte 6*4 ; discard args to mmap
lodsd
push eax ; sz_compressed
lodsd ; junk cto8, algo, unused[2]
push esi ; &compressed_data
call ebp ; decompress(&src, srclen, &dst, &dstlen)
pop eax ; discard &compressed_data
pop eax ; discard sz_compressed
ret ; &destination
main:
pop ebp ; &decompress
push eax ; sz_uncompressed (junk, actually)
push esp ; &sz_uncompressed
call unfold
eof:
@@ -190,3 +194,4 @@ eof:
dw eof
; vi:ts=8:et:nowrap