Support for 64-bit AMD x86_64

Makefile Added Files: a_lx_elf64.c amd_bxx.S amd_d_nrv2e.S amd_regs.h fold_elf64amd.S l_lx_elf64amd.S l_lx_elf64amd.lds committer: jreiser <jreiser> 1131566835 +0000
2005-11-09 20:07:15 +00:00
parent 414a6c1c9e
commit 023c06e178
8 changed files with 907 additions and 0 deletions
@@ -0,0 +1,109 @@
+/*  l_lx_elf64amd.S -- Linux program entry point & decompressor (Elf binary)
+*
+*  This file is part of the UPX executable compressor.
+*
+*  Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
+*  Copyright (C) 1996-2004 Laszlo Molnar
+*  Copyright (C) 2000-2005 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
+*  <mfx@users.sourceforge.net>          <ml1050@users.sourceforge.net>
+*
+*  John F. Reiser
+*  <jreiser@users.sourceforge.net>
+*/
+
+/*__LEXEC000__*/
+_start: .globl _start
+/* The following 'call' must be at _start; fold_begin knows this,
+   and so does PackLinuxElf64amd::pack3() .
+*/
+        call main  # push address of decompressor
+#include "amd_d_nrv2e.S"
+
+sz_b_info= 12
+  sz_unc= 0
+  sz_cpr= 4
+  b_method= 8
+
+PROT_READ=  1
+PROT_WRITE= 2
+PROT_EXEC=  4
+
+MAP_PRIVATE= 2
+MAP_FIXED=     0x10
+MAP_ANONYMOUS= 0x20
+
+SYS_mmap= 9  # 64-bit mode only!
+
+PAGE_SHIFT= 12
+PAGE_MASK= (~0<<PAGE_SHIFT)
+PAGE_SIZE= -PAGE_MASK
+
+#include "amd_regs.h"
+
+/* Decompress the rest of this loader, and jump to it.
+   Map a page to hold the decompressed bytes.  Logically this could
+   be done by setting .p_memsz for our first PT_LOAD.  But as of 2005-11-09,
+   linux 2.6.14 only does ".bss expansion" on the PT_LOAD that describes the
+   highest address.  [I regard this as a bug, and it makes the kernel's
+   fs/binfmt_elf.c complicated, buggy, and insecure.]  For us, that is the 2nd
+   PT_LOAD, which is the only way that linux allows to set the brk() for the
+   uncompressed program.  [This is a signicant kernel misfeature.]
+*/
+unfold:
+        pop %rdi  # &{ b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...}
+            subl %arg2l,%arg2l  # %arg2= 0
+        push %rdi  # remember &b_info
+            lea PROT_READ | PROT_WRITE | PROT_EXEC(%arg2),%arg3l
+        addl sz_cpr(%rdi),%arg1l  # n.b.: %rdi===%arg1;   XXX: 4GB
+            lea MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS(%arg2),%sys4l
+        addl $-1+ sz_b_info,%arg1l  # XXX: 4GB
+            movl $ PAGE_MASK,%ecx
+        subl %ecx,%arg1l  # XXX: 4GB
+            lea SYS_mmap(%arg2),%eax
+        andl %ecx,%arg1l  # next page boundary after fold;  XXX: 4GB
+            subl %ecx,%arg2l  # %arg2l= PAGE_SIZE
+                push %rcx
+            subl %arg5l,%arg5l; subl %arg6l,%arg6l
+        syscall  # trashes %rcx
+                pop %rcx
+        cmpl %ecx,%eax; jb 0f; hlt; 0:  # XXX: 4GB
+
+        pop %rsi  # %arg2= &b_info
+        push %rax  # ret_addr after decompression
+        .byte 0x92  # xchg %eax,%arg3l  # %arg3= dst for unfolding  XXX: 4GB
+        lodsl; movl %arg2l,%arg4l  # &len_dst ==> &do_not_care  XXX: 4GB
+        lodsl; .byte 0x97  # xchg %rax,%arg1l  # sz_cpr  XXX: 4GB
+        lodsl; movzbl %al,%arg5l  # b_method
+        xchg %arg1l,%arg2l  # XXX: 4GB
+        jmp *%rbp  # goto decompress; return to unfolded loader
+main:
+        # int3  # uncomment for debugging
+        pop %rbp  # &dcompress
+        call unfold
+        /* { b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...} */
+
+eof:
+/*__XTHEENDX__*/
+
+/*
+vi:ts=8:et:nowrap
+*/
+