/* p_ps1.cpp -- This file is part of the UPX executable compressor. Copyright (C) 1996-2003 Markus Franz Xaver Johannes Oberhumer Copyright (C) 1996-2003 Laszlo Molnar Copyright (C) 2002-2003 Jens Medoch 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 Jens Medoch */ #include "conf.h" #include "file.h" #include "filter.h" #include "packer.h" #include "p_ps1.h" static const #include "stub/l_ps1.h" #define MIPS_HI(a) ((a) >> 16) #define MIPS_LO(a) ((a) & 0xffff) #define MIPS_JP(a) ((0x08 << 24) | (((a) & 0x0fffffff) >> 2)) #define TIL_ALIGNED(a,b) (((b) - ((a) & ((b) - 1))) & (b) - 1) #define CD_SEC 2048 #define PS_HDR_SIZE CD_SEC #define PS_MAX_SIZE 0x1e8000 #define SZ_IH_BKUP (10 * sizeof(LE32)) // FIXME: would be nice to set this once, so runtime and handler will // use this define together #define EIGHTBIT /************************************************************************* // ps1 exe looks like this: // 1.

2048 bytes // 2. plain binary // // header: contains the ps1_exe_t structure 188 bytes at offset zero // rest is filled with zeros to reach the required // cd mode 2 data sector size of 2048 bytes // body: contains the binary data / code of the executable // reqiures: executable code must be aligned to 4 // must be aligned to 2048 to run from a CD // optional: not aligned to 2048 (for console run only) **************************************************************************/ PackPs1::PackPs1(InputFile *f) : super(f), overlap(0), sa_cnt(0), cfile_size(0) { COMPILE_TIME_ASSERT(sizeof(ps1_exe_t) == 188); COMPILE_TIME_ASSERT(PS_HDR_SIZE > sizeof(ps1_exe_t)); COMPILE_TIME_ASSERT(SZ_IH_BKUP == 40); #if defined(WITH_NRV) COMPILE_TIME_ASSERT(sizeof(nrv_loader) == 1570); COMPILE_TIME_ASSERT(NRV_LOADER_CRC32 == 0xd78b1eb4); #endif fdata_size = file_size - PS_HDR_SIZE; } const int *PackPs1::getCompressionMethods(int method, int level) const { #ifdef EIGHTBIT return Packer::getDefaultCompressionMethods_8(method, level); #else return Packer::getDefaultCompressionMethods_le32(method, level); #endif } const int *PackPs1::getFilters() const { return NULL; } /************************************************************************* // util // readFileHeader() reads ih and checks for illegal values // checkFileHeader() checks ih for legal but unsupported values **************************************************************************/ int PackPs1::readFileHeader() { fi->seek(0, SEEK_SET); fi->readx(&ih, sizeof(ih)); if (memcmp(&ih.id,"PS-X EXE",8) != 0 && memcmp(&ih.id,"EXE X-SP",8) != 0) return 0; if (ih.text != 0 && ih.data != 0) return 0; return UPX_F_PS1_EXE; } bool PackPs1::checkFileHeader() { // FIXME: check ih for legal but unsupported values if (fdata_size != ih.tx_len || (ih.tx_len & 3)) { if (!opt->force) { infoWarning("check header for file size"); return false; } cfile_size = fdata_size; } if (ih.da_ptr != 0 && ih.da_len != 0 && ih.bs_ptr != 0 && ih.bs_len != 0 && !opt->force) return false; cfile_size = ih.tx_len; return true; } /************************************************************************* // patch util **************************************************************************/ void PackPs1::patch_mips_le(void *b, int blen, const void *old, unsigned new_) { size_t type = strlen((const char*)old); if (type == 2) { unsigned char w[2]; set_le16(w, get_be16(old)); patch_le16(b, blen, w, MIPS_LO(new_)); } else if (type == 4) { unsigned char w[4]; set_le32(w, get_be32(old)); int boff = find(b, blen, w, 4); if (boff == -1) { patch_le16(b, blen, &w[0], MIPS_LO(new_)); patch_le16(b, blen, &w[2], MIPS_HI(new_)); } else { patch_le32((unsigned char *)b + boff, (blen-boff), &w, new_); } } else throwInternalError("bad marker length"); } /************************************************************************* // **************************************************************************/ bool PackPs1::canPack() { if (!readFileHeader()) return false; unsigned char buf[1024]; fi->readx(buf, sizeof(buf)); checkAlreadyPacked(buf, sizeof(buf)); if (!checkFileHeader()) throwCantPack("unsupported header flags (try --force)"); if (file_size <= (PS_HDR_SIZE*3) && !opt->force) throwCantPack("file is too small (try --force)"); if (file_size > PS_MAX_SIZE && !opt->force) throwCantPack("file is too big (try --force)"); return true; } /************************************************************************* // **************************************************************************/ int PackPs1::buildLoader(const Filter *) { initLoader(nrv_loader,sizeof(nrv_loader)); addLoader("PS1MAIN0", ih.tx_ptr & 0xffff ? "PS1JSTA0" : "PS1JSTH0", "PS1DECO0", NULL); #ifdef EIGHTBIT if (ph.method == M_NRV2B_8) addLoader("PS1N2BD0", NULL); else if (ph.method == M_NRV2D_8) addLoader("PS1N2DD0", NULL); else if (ph.method == M_NRV2E_8) addLoader("PS1N2ED0", NULL); #else if (ph.method == M_NRV2B_LE32) addLoader("PS1N2BD0", NULL); else if (ph.method == M_NRV2D_LE32) addLoader("PS1N2DD0", NULL); else if (ph.method == M_NRV2E_LE32) addLoader("PS1N2ED0", NULL); #endif else throwInternalError("unknown compression method"); if (sa_cnt) addLoader((sa_cnt > 0xfffc) ? "MSETBIG0" : "MSETSML0", // set small/big memset (ih.tx_len & 3) ? "MSETUAL0" : "MSETALG0", // un/aligned memset NULL); addLoader("PS1EXIT0", "IDENTSTR", "PS1PHDR0", "PS1RGSZ0", NULL); return getLoaderSize(); } /************************************************************************* // **************************************************************************/ void PackPs1::pack(OutputFile *fo) { ibuf.alloc(fdata_size); obuf.allocForCompression(fdata_size); const upx_byte *p_scan = ibuf+(fdata_size-1); // read file fi->seek(PS_HDR_SIZE,SEEK_SET); fi->readx(ibuf,fdata_size); // scan the end of file for 2048 bytes sector alignment // the removed space will secure in-place decompression while (!(*p_scan--)) { if (sa_cnt++ > (0xfffc<<3)) break; } if (sa_cnt > 0xfffc) sa_cnt = ALIGN_DOWN(sa_cnt,8); else sa_cnt = ALIGN_DOWN(sa_cnt,4); // prepare packheader ph.u_len = (fdata_size - sa_cnt); ph.filter = 0; Filter ft(ph.level); // compress (max_match = 65535) compressWithFilters(&ft, 512, 0, NULL, 0, 65535); if (ph.overlap_overhead > sa_cnt) { if (!opt->force) { infoWarning("not in-place decompressible"); throwCantPack("packed data overlap (try --force)"); } else { overlap = ALIGN_UP((ph.overlap_overhead-sa_cnt),4); opt->info_mode += !opt->info_mode ? 1 : 0; infoWarning("%s will load to a %d bytes higher offset",fi->getName(),overlap); } } memcpy(&oh, &ih, sizeof(ih)); memcpy(&oh.ih_bkup, &ih.epc, SZ_IH_BKUP); oh.ih_csum = upx_adler32(&ih.epc, SZ_IH_BKUP); const int lsize = getLoaderSize(); MemBuffer loader(lsize); memcpy(loader,getLoader(),lsize); unsigned pad = 0; unsigned filelen = ALIGN_UP((cfile_size ? cfile_size : (unsigned) ih.tx_len), 4); unsigned pad_code = TIL_ALIGNED(ph.c_len, 4); const int h_len = lsize-getLoaderSectionStart("IDENTSTR"); const int e_len = lsize-h_len; const int d_len = e_len-getLoaderSectionStart("PS1DECO0"); const int s_len = get_le32(&loader[getLoaderSectionStart("PS1RGSZ0")]); // set the offset for compressed stuff at the very end of file const unsigned decomp_data_start = ih.tx_ptr; const unsigned comp_data_start = ((decomp_data_start + filelen + overlap) - ph.c_len); const unsigned entry = comp_data_start - e_len - pad_code; patchPackHeader(loader,lsize); patch_mips_le(loader,e_len,"JPEP",MIPS_JP(ih.epc)); if (sa_cnt) patch_mips_le(loader,e_len,"SC",MIPS_LO(sa_cnt > 0xfffc ? sa_cnt >> 3 : sa_cnt)); if (ih.tx_ptr & 0xffff) patch_mips_le(loader,e_len,"DECO",decomp_data_start); else patch_mips_le(loader,e_len,"DE",MIPS_HI(decomp_data_start)); patch_mips_le(loader,e_len,"COMP",comp_data_start); patch_mips_le(loader,e_len,"DCRT",entry + (e_len - d_len)); patch_mips_le(loader,e_len,"LS",d_len + s_len); oh.tx_ptr = entry; oh.tx_len = ph.c_len + e_len + pad_code; oh.epc = entry; if (!opt->ps1_exe.no_align) { pad = oh.tx_len; oh.tx_len = ALIGN_UP(oh.tx_len, CD_SEC); pad = oh.tx_len - pad; oh.tx_ptr -= pad; } ibuf.clear(0,fdata_size); upx_bytep paddata = ibuf; // ps1_exe_t structure 188 bytes fo->write(&oh,sizeof(oh)); // id & upx header some more bytes fo->write(loader+e_len,h_len); // remember? header size is 2048 bytes so we write the rest fo->write(paddata,PS_HDR_SIZE - fo->getBytesWritten()); // padding placed in front of the runtime, so it doesn't overwrite other // than the allowed space (ih.tx_ptr >= allowed space <= (ih.tx_ptr+ih.tx_len)) if (pad) fo->write(paddata,pad); // runtime fo->write(loader,e_len); // does the code need to be padded? must be aligned to 4! if (pad_code) fo->write(paddata,pad_code); // compressed binary / data fo->write(obuf,ph.c_len); verifyOverlappingDecompression(); if (!checkFinalCompressionRatio(fo)) throwNotCompressible(); #if 0 printf("%-13s: compressed : %8ld bytes\n", getName(), (long) ph.c_len); printf("%-13s: decompressor : %8ld bytes\n", getName(), (long) e_len); printf("%-13s: code entry : %08X bytes\n", getName(), (unsigned int) oh.epc); printf("%-13s: load address : %08X bytes\n", getName(), (unsigned int) oh.tx_ptr); printf("%-13s: section size : %8ld bytes\n", getName(), (long) oh.tx_len); printf("%-13s: eof in mem IF: %08X bytes\n", getName(), (unsigned int) ih.tx_ptr+ih.tx_len); printf("%-13s: eof in mem OF: %08X bytes\n", getName(), (unsigned int) oh.tx_ptr+oh.tx_len); #endif } /************************************************************************* // **************************************************************************/ int PackPs1::canUnpack() { if (!readFileHeader()) return false; if (!readPackHeader(1024)) return false; // check header as set by packer if (ih.ih_csum != upx_adler32(&ih.ih_bkup, SZ_IH_BKUP) && (ph.c_len >= fdata_size)) throwCantUnpack("header damaged"); // generic check if (!checkFileHeader()) throwCantUnpack("unsupported header flags"); return true; } /************************************************************************* // **************************************************************************/ void PackPs1::unpack(OutputFile *fo) { // restore orig exec hdr memcpy(&oh, &ih, sizeof(ih)); memcpy(&oh.epc, &ih.ih_bkup, SZ_IH_BKUP); // check for removed sector alignment assert(oh.tx_len >= ph.u_len); const unsigned pad = oh.tx_len - ph.u_len; ibuf.alloc(fdata_size); obuf.allocForUncompression(ph.u_len, pad); fi->seek(PS_HDR_SIZE, SEEK_SET); fi->readx(ibuf, fdata_size); // clear backup and checksum of header memset(&oh.ih_bkup, 0, SZ_IH_BKUP+4); // decompress decompress(ibuf+(fdata_size-ph.c_len), obuf); // write decompressed file if (fo) { // write header fo->write(&oh, sizeof(oh)); // align the ps exe header (mode 2 sector data size) ibuf.clear(0, PS_HDR_SIZE - sizeof(oh)); // write uncompressed data + pad fo->write(ibuf, PS_HDR_SIZE - sizeof(oh)); obuf.clear(ph.u_len, pad); fo->write(obuf, ph.u_len + pad); } } /* vi:ts=4:et:nowrap */