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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_sys.cpp
+15 -17
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@@ -32,6 +32,7 @@
#include "packer.h"
#include "p_com.h"
#include "p_sys.h"
#include "linker.h"
static const
#include "stub/i086-dos16.sys.h"
@@ -67,7 +68,6 @@ void PackSys::patchLoader(OutputFile *fo,
upx_byte *loader, int lsize,
unsigned calls)
{
const int filter_id = ph.filter;
const int e_len = getLoaderSectionStart("SYSCUTPO");
const int d_len = lsize - e_len;
assert(e_len > 0 && e_len < 256);
@@ -76,25 +76,23 @@ void PackSys::patchLoader(OutputFile *fo,
if (ph.u_len + d_len + ph.overlap_overhead > 0xfffe)
throwNotCompressible();
memcpy(loader,ibuf,6); // copy from orig. header
memcpy(loader+8,ibuf+8,2); // opendos wants this word too
// use some fields of the original file
linker->defineSymbol("next", get_le32(ibuf));
linker->defineSymbol("attribute", get_le16(ibuf + 4));
linker->defineSymbol("interrupt", get_le16(ibuf + 8));
unsigned copy_to = ph.u_len + d_len + ph.overlap_overhead;
patch_le16(loader,lsize,"JO",get_le16(ibuf+6)-copy_to-1);
if (filter_id)
{
assert(calls > 0);
patch_le16(loader,lsize,"CT",calls);
}
linker->defineSymbol("sys_entry", get_le16(ibuf + 6) - copy_to - 1);
linker->defineSymbol("calltrick_calls", calls);
linker->defineSymbol("copy_source", ph.c_len + lsize -1);
linker->defineSymbol("copy_destination", copy_to);
linker->defineSymbol("decompressor", ph.u_len + ph.overlap_overhead + 2);
linker->relocate();
loader = getLoader();
patchPackHeader(loader,e_len);
const unsigned jmp_pos = find_le16(loader,e_len,get_le16("JM"));
patch_le16(loader,e_len,"JM",ph.u_len+ph.overlap_overhead+2-jmp_pos-2);
loader[getLoaderSectionStart("SYSSUBSI") - 1] = (upx_byte) -e_len;
patch_le16(loader,e_len,"DI",copy_to);
patch_le16(loader,e_len,"SI",ph.c_len+e_len+d_len-1);
// write loader + compressed file
fo->write(loader,e_len); // entry
fo->write(obuf,ph.c_len);
@@ -107,7 +105,7 @@ int PackSys::buildLoader(const Filter *ft)
initLoader(nrv2b_loader,sizeof(nrv2b_loader));
addLoader("SYSMAIN1",
opt->cpu == opt->CPU_8086 ? "SYSI0861" : "SYSI2861",
"SYSMAIN2,SYSSUBSI",
"SYSMAIN2",
ph.first_offset_found == 1 ? "SYSSBBBP" : "",
ft->id ? "SYSCALLT" : "",
"SYSMAIN3,UPX1HEAD,SYSCUTPO,NRV2B160,NRVDDONE,NRVDECO1",