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ElfLinker started. Dos/com & dos/sys formats converted

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This commit is contained in:
László Molnár
2006-06-28 14:45:58 +02:00
parent 58e885c052
commit 6d8afec510
13 changed files with 2182 additions and 388 deletions
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src/p_com.cpp
+21 -16
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@@ -31,6 +31,7 @@
#include "filter.h"
#include "packer.h"
#include "p_com.h"
#include "linker.h"
static const
#include "stub/i086-dos16.com.h"
@@ -98,7 +99,6 @@ void PackCom::patchLoader(OutputFile *fo,
upx_byte *loader, int lsize,
unsigned calls)
{
const int filter_id = ph.filter;
const int e_len = getLoaderSectionStart("COMCUTPO");
const int d_len = lsize - e_len;
assert(e_len > 0 && e_len < 256);
@@ -111,22 +111,21 @@ void PackCom::patchLoader(OutputFile *fo,
if (upper_end + stacksize > 0xfffe)
throwCantPack("file is too big for dos/com");
if (filter_id)
{
assert(calls > 0);
patch_le16(loader,lsize,"CT",calls);
}
linker->defineSymbol("calltrick_calls", calls);
linker->defineSymbol("sp_limit", upper_end + stacksize);
linker->defineSymbol("bytes_to_copy", ph.c_len + lsize);
linker->defineSymbol("copy_source", ph.c_len + lsize + 0x100);
linker->defineSymbol("copy_destination", upper_end);
// FIXME: Depends on: decompr_start == cutpoint+1 !!!
linker->defineSymbol("decompressor", upper_end - 0xff -
d_len - getLoaderSection("UPX1HEAD"));
linker->relocate();
loader = getLoader();
// some day we could use the relocation stuff for patchPackHeader too
patchPackHeader(loader,e_len);
// NOTE: Depends on: decompr_start == cutpoint+1 !!!
patch_le16(loader,e_len,"JM",upper_end - 0xff - d_len - getLoaderSection("UPX1HEAD"));
loader[getLoaderSectionStart("COMSUBSI") - 1] = (upx_byte) -e_len;
patch_le16(loader,e_len,"DI",upper_end);
patch_le16(loader,e_len,"SI",ph.c_len + lsize + 0x100);
patch_le16(loader,e_len,"CX",ph.c_len + lsize);
patch_le16(loader,e_len,"SP",upper_end + stacksize);
// write loader + compressed file
fo->write(loader,e_len); // entry
fo->write(obuf,ph.c_len);
@@ -142,7 +141,7 @@ void PackCom::patchLoader(OutputFile *fo,
int PackCom::buildLoader(const Filter *ft)
{
initLoader(nrv2b_loader,sizeof(nrv2b_loader));
addLoader("COMMAIN1,COMSUBSI",
addLoader("COMMAIN1",
ph.first_offset_found == 1 ? "COMSBBBP" : "",
"COMPSHDI",
ft->id ? "COMCALLT" : "",
@@ -271,6 +270,12 @@ void PackCom::unpack(OutputFile *fo)
}
Linker* PackCom::newLinker() const
{
return new ElfLinker();
}
/*
vi:ts=4:et
*/