#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>

#include "lx_loader.h"

// !!! FIXME: some cut-and-paste with lx_loader.c ...

static int sanityCheckExe(uint8 **_exe, uint32 *_exelen)

{

if (*_exelen < 196) {

fprintf(stderr, "not an OS/2 LX EXE\n");

return 0;

}

const uint32 header_offset = *((uint32 *) (*_exe + 0x3C));

//printf("header offset is %u\n", (uint) header_offset);

if ((header_offset + sizeof (LxHeader)) >= *_exelen) {

fprintf(stderr, "not an OS/2 LX EXE\n");

return 0;

}

*_exe += header_offset; // skip the DOS stub, etc.

*_exelen -= header_offset;

const LxHeader *lx = (const LxHeader *) *_exe;

if ((lx->magic_l != 'L') || (lx->magic_x != 'X')) {

fprintf(stderr, "not an OS/2 LX EXE\n");

return 0;

}

if ((lx->byte_order != 0) || (lx->word_order != 0)) {

fprintf(stderr, "Program is not little-endian!\n");

return 0;

}

if (lx->lx_version != 0) {

fprintf(stderr, "Program is unknown LX EXE version (%u)\n", (uint) lx->lx_version);

return 0;

}

if (lx->cpu_type > 3) { // 1==286, 2==386, 3==486

fprintf(stderr, "Program needs unknown CPU type (%u)\n", (uint) lx->cpu_type);

return 0;

}

if (lx->os_type != 1) { // 1==OS/2, others: dos4, windows, win386, unknown.

fprintf(stderr, "Program needs unknown OS type (%u)\n", (uint) lx->os_type);

return 0;

}

if (lx->page_size != 4096) {

fprintf(stderr, "Program page size isn't 4096 (%u)\n", (uint) lx->page_size);

return 0;

}

return 1;

} // sanityCheckExe

static void parseExe(const char *exefname, uint8 *exe, uint32 exelen)

{

printf("%s\n", exefname);

const uint8 *origexe = exe;

if (!sanityCheckExe(&exe, &exelen))

return;

const LxHeader *lx = (const LxHeader *) exe;

printf("module version: %u\n", (uint) lx->module_version);

printf("module flags:");

if (lx->module_flags & 0x4) printf(" LIBINIT");

if (lx->module_flags & 0x10) printf(" INTERNALFIXUPS");

if (lx->module_flags & 0x20) printf(" EXTERNALFIXUPS");

if (lx->module_flags & 0x100) printf(" PMINCOMPAT");

if (lx->module_flags & 0x200) printf(" PMCOMPAT");

if (lx->module_flags & 0x300) printf(" USESPM");

if (lx->module_flags & 0x2000) printf(" NOTLOADABLE");

if (lx->module_flags & 0x8000) printf(" LIBRARYMODULE");

if (lx->module_flags & 0x18000) printf(" PROTMEMLIBRARYMODULE");

if (lx->module_flags & 0x20000) printf(" PHYSDRIVERMODULE");

if (lx->module_flags & 0x28000) printf(" VIRTDRIVERMODULE");

if (lx->module_flags & 0x40000000) printf(" LIBTERM");

printf("\n");

printf("Number of pages in module: %u\n", (uint) lx->module_num_pages);

printf("EIP Object number: %u\n", (uint) lx->eip_object);

printf("EIP: 0x%X\n", (uint) lx->eip);

printf("ESP Object number: %u\n", (uint) lx->esp_object);

printf("ESP: 0x%X\n", (uint) lx->esp);

printf("Page size: %u\n", (uint) lx->page_size);

printf("Page offset shift: %u\n", (uint) lx->page_offset_shift);

printf("Fixup section size: %u\n", (uint) lx->fixup_section_size);

printf("Fixup section checksum: 0x%X\n", (uint) lx->fixup_section_checksum);

printf("Loader section size: %u\n", (uint) lx->loader_section_size);

printf("Loader section checksum: 0x%X\n", (uint) lx->loader_section_checksum);

printf("Object table offset: %u\n", (uint) lx->object_table_offset);

printf("Number of objects in module: %u\n", (uint) lx->module_num_objects);

printf("Object page table offset: %u\n", (uint) lx->object_page_table_offset);

printf("Object iterated pages offset: %u\n", (uint) lx->object_iter_pages_offset);

printf("Resource table offset: %u\n", (uint) lx->resource_table_offset);

printf("Number of resource table entries: %u\n", (uint) lx->num_resource_table_entries);

printf("Resident name table offset: %u\n", (uint) lx->resident_name_table_offset);

printf("Entry table offset: %u\n", (uint) lx->entry_table_offset);

printf("Module directives offset: %u\n", (uint) lx->module_directives_offset);

printf("Number of module directives: %u\n", (uint) lx->num_module_directives);

printf("Fixup page table offset: %u\n", (uint) lx->fixup_page_table_offset);

printf("Fixup record table offset: %u\n", (uint) lx->fixup_record_table_offset);

printf("Import module table offset: %u\n", (uint) lx->import_module_table_offset);

printf("Number of inport module entries: %u\n", (uint) lx->num_import_mod_entries);

printf("Import procedure name table offset: %u\n", (uint) lx->import_proc_table_offset);

printf("Per-page checksum offset: %u\n", (uint) lx->per_page_checksum_offset);

printf("Data pages offset: %u\n", (uint) lx->data_pages_offset);

printf("Number of preload pages: %u\n", (uint) lx->num_preload_pages);

printf("Non-resident name table offset: %u\n", (uint) lx->non_resident_name_table_offset);

printf("Non-resident name table length: %u\n", (uint) lx->non_resident_name_table_len);

printf("Non-resident name table checksum: 0x%X\n", (uint) lx->non_resident_name_table_checksum);

printf("Auto data segment object number: %u\n", (uint) lx->auto_ds_object_num);

printf("Debug info offset: %u\n", (uint) lx->debug_info_offset);

printf("Debug info length: %u\n", (uint) lx->debug_info_len);

printf("Number of instance pages in preload section: %u\n", (uint) lx->num_instance_preload);

printf("Number of instance pages in demand section: %u\n", (uint) lx->num_instance_demand);

printf("Heap size: %u\n", (uint) lx->heapsize);

/* This is apparently a requirement as of OS/2 2.0, according to lxexe.txt. */

if ((lx->object_iter_pages_offset != 0) && (lx->object_iter_pages_offset != lx->data_pages_offset)) {

fprintf(stderr, "Object iterator pages offset must be 0 or equal to Data pages offset\n");

}

// when an LX file says "object" it's probably more like "section" or "segment" ...?

printf("\n");

printf("Object table (%u entries):\n", (uint) lx->module_num_objects);

for (uint32 i = 0; i < lx->module_num_objects; i++) {

const LxObjectTableEntry *obj = ((const LxObjectTableEntry *) (exe + lx->object_table_offset)) + i;

printf("Object #%u:\n", (uint) i+1);

printf("Virtual size: %u\n", (uint) obj->virtual_size);

printf("Relocation base address: 0x%X\n", (uint) obj->reloc_base_addr);

printf("Object flags:");

if (obj->object_flags & 0x1) printf(" READ");

if (obj->object_flags & 0x2) printf(" WRITE");

if (obj->object_flags & 0x4) printf(" EXEC");

if (obj->object_flags & 0x8) printf(" RESOURCE");

if (obj->object_flags & 0x10) printf(" DISCARD");

if (obj->object_flags & 0x20) printf(" SHARED");

if (obj->object_flags & 0x40) printf(" PRELOAD");

if (obj->object_flags & 0x80) printf(" INVALID");

if (obj->object_flags & 0x100) printf(" ZEROFILL");

if (obj->object_flags & 0x200) printf(" RESIDENT");

if (obj->object_flags & 0x300) printf(" RESIDENT+CONTIG");

if (obj->object_flags & 0x400) printf(" RESIDENT+LONGLOCK");

if (obj->object_flags & 0x800) printf(" SYSRESERVED");

if (obj->object_flags & 0x1000) printf(" 16:16");

if (obj->object_flags & 0x2000) printf(" BIG");

if (obj->object_flags & 0x4000) printf(" CONFORM");

if (obj->object_flags & 0x8000) printf(" IOPL");

printf("\n");

printf("Page table index: %u\n", (uint) obj->page_table_index);

printf("Number of page table entries: %u\n", (uint) obj->num_page_table_entries);

printf("System-reserved field: %u\n", (uint) obj->reserved);

printf("Object pages:\n");

const LxObjectPageTableEntry *objpage = ((const LxObjectPageTableEntry *) (exe + lx->object_page_table_offset)) + (obj->page_table_index - 1);

const uint32 *fixuppage = (((const uint32 *) (exe + lx->fixup_page_table_offset)) + (obj->page_table_index - 1));

for (uint32 i = 0; i < obj->num_page_table_entries; i++, objpage++, fixuppage++) {

printf("Object Page #%u:\n", (uint) (i + obj->page_table_index));

printf("Page data offset: 0x%X\n", (uint) objpage->page_data_offset);

printf("Page data size: %u\n", (uint) objpage->data_size);

printf("Page flags: (%u)", (uint) objpage->flags);

if (objpage->flags == 0x0) printf(" PHYSICAL");

else if (objpage->flags == 0x1) printf(" ITERATED");

else if (objpage->flags == 0x2) printf(" INVALID");

else if (objpage->flags == 0x3) printf(" ZEROFILL");

else if (objpage->flags == 0x4) printf(" RANGE");

else if (objpage->flags == 0x5) printf(" COMPRESSED");

else printf(" UNKNOWN");

printf("\n");

const uint32 fixupoffset = *fixuppage;

const uint32 fixuplen = fixuppage[1] - fixuppage[0];

printf("Page's fixup record offset: %u\n", (uint) fixupoffset);

printf("Page's fixup record size: %u\n", (uint) fixuplen);

printf("Fixup records:\n");

const uint8 *fixup = (exe + lx->fixup_record_table_offset) + fixupoffset;

const uint8 *fixupend = fixup + fixuplen;

for (uint32 i = 0; fixup < fixupend; i++) {

printf("Fixup Record #%u:\n", (uint) (i + 1));

printf("Source type: ");

const uint8 srctype = *(fixup++);

if (srctype & 0x10) printf("[FIXUPTOALIAS] ");

if (srctype & 0x20) printf("[SOURCELIST] ");

switch (srctype & 0xF) {

case 0x00: printf("Byte fixup"); break;

case 0x02: printf("16-bit selector fixup"); break;

case 0x03: printf("16:16 pointer fixup"); break;

case 0x05: printf("16-bit offset fixup"); break;

case 0x06: printf("16:32 pointer fixup"); break;

case 0x07: printf("32-bit offset fixup"); break;

case 0x08: printf("32-bit self-relative offset fixup"); break;

default: printf("(undefined fixup)"); break;

} // switch

printf("\n");

const uint8 fixupflags = *(fixup++);

printf("Target flags:");

switch (fixupflags & 0x3) {

case 0x0: printf(" INTERNAL"); break;

case 0x1: printf(" IMPORTBYORDINAL"); break;

case 0x2: printf(" IMPORTBYNAME"); break;

case 0x3: printf(" INTERNALVIAENTRY"); break;

} // switch

if (fixupflags & 0x4) printf(" ADDITIVE");

if (fixupflags & 0x8) printf(" INTERNALCHAINING");

if (fixupflags & 0x10) printf(" 32BITTARGETOFFSET");

if (fixupflags & 0x20) printf(" 32BITADDITIVE");

if (fixupflags & 0x40) printf(" 16BITORDINAL");

if (fixupflags & 0x80) printf(" 8BITORDINAL");

printf("\n");

uint8 srclist_count = 0;

if (srctype & 0x20) { // source list

srclist_count = *(fixup++);

printf("Source offset list count: %u\n", (uint) srclist_count);

} else {

const sint16 srcoffset = *((sint16 *) fixup); fixup += 2;

printf("Source offset: %d\n", (int) srcoffset);

} // else

printf("\n");

switch (fixupflags & 0x3) {

case 0x0:

printf("Internal fixup record:\n");

if (fixupflags & 0x40) { // 16 bit value

const uint16 val = *((uint16 *) fixup); fixup += 2;

printf("Object: %u\n", (uint) val);

} else {

const uint8 val = *(fixup++);

printf("Object: %u\n", (uint) val);

} // else

printf("Target offset: ");

if ((srctype & 0xF) == 0x2) { // 16-bit selector fixup

printf("[not used for 16-bit selector fixups]\n");

} else if (fixupflags & 0x10) { // 32-bit target offset

const uint32 val = *((uint32 *) fixup); fixup += 4;

printf("%u\n", (uint) val);

} else { // 16-bit target offset

const uint16 val = *((uint16 *) fixup); fixup += 2;

printf("%u\n", (uint) val);

} // else

break;

case 0x1:

printf("Import by ordinal fixup record:\n");

if (fixupflags & 0x40) { // 16 bit value

const uint16 val = *((uint16 *) fixup); fixup += 2;

printf("Module ordinal: %u\n", (uint) val);

} else {

const uint8 val = *(fixup++);

printf("Module ordinal: %u\n", (uint) val);

} // else

if (fixupflags & 0x80) { // 8 bit value

const uint8 val = *(fixup++);

printf("Import ordinal: %u\n", (uint) val);

} else if (fixupflags & 0x10) { // 32-bit value

const uint32 val = *((uint32 *) fixup); fixup += 4;

printf("Import ordinal: %u\n", (uint) val);

} else { // 16-bit value

const uint16 val = *((uint16 *) fixup); fixup += 2;

printf("Import ordinal: %u\n", (uint) val);

} // else

uint32 additive = 0;

if (fixupflags & 0x4) { // Has additive.

if (fixupflags & 0x20) { // 32-bit value

additive = *((uint32 *) fixup);

fixup += 4;

} else { // 16-bit value

additive = *((uint16 *) fixup);

fixup += 2;

} // else

} // if

printf("Additive: %u\n", (uint) additive);

break;

case 0x2: {

printf("Import by name fixup record:\n");

if (fixupflags & 0x40) { // 16 bit value

const uint16 val = *((uint16 *) fixup); fixup += 2;

printf("Module ordinal: %u\n", (uint) val);

} else {

const uint8 val = *(fixup++);

printf("Module ordinal: %u\n", (uint) val);

} // else

uint32 name_offset = 0;

if (fixupflags & 0x10) { // 32-bit value

name_offset = *((uint32 *) fixup); fixup += 4;

} else { // 16-bit value

name_offset = *((uint16 *) fixup); fixup += 2;

} // else

const uint8 *import_name = (exe + lx->import_proc_table_offset) + name_offset;

char name[128];

const uint8 namelen = *(import_name++) & 0x7F;

memcpy(name, import_name, namelen);

name[namelen] = '\0';

printf("Name offset: %u ('%s')\n", (uint) name_offset, name);

uint32 additive = 0;

if (fixupflags & 0x4) { // Has additive.

if (fixupflags & 0x20) { // 32-bit value

additive = *((uint32 *) fixup);

fixup += 4;

} else { // 16-bit value

additive = *((uint16 *) fixup);

fixup += 2;

} // else

} // if

printf("Additive: %u\n", (uint) additive);

break;

} // case

case 0x3:

printf("Internal entry table fixup record:\n");

printf("WRITE ME\n"); exit(1);

break;

} // switch

if (srctype & 0x20) { // source list

printf("Source offset list:");

for (uint8 i = 0; i < srclist_count; i++) {

const sint16 val = *((sint16 *) fixup); fixup += 2;

printf(" %d", (int) val);

} // for

} // if

printf("\n\n");

} // while

printf("\n");

} // for

} // for

printf("\n");

printf("Resource table (%u entries):\n", (uint) lx->num_resource_table_entries);

for (uint32 i = 0; i < lx->num_resource_table_entries; i++) {

const LxResourceTableEntry *rsrc = ((const LxResourceTableEntry *) (exe + lx->resource_table_offset)) + i;

printf("%u:\n", (uint) i);

printf("Type ID: %u\n", (uint) rsrc->type_id);

printf("Name ID: %u\n", (uint) rsrc->name_id);

printf("Resource size: %u\n", (uint) rsrc->resource_size);

printf("Object: %u\n", (uint) rsrc->object);

printf("Offset: 0x%X\n", (uint) rsrc->offset);

printf("\n");

} // for

printf("\n");

printf("Entry table:\n");

int bundleid = 1;

int ordinal = 1;

const uint8 *entryptr = exe + lx->entry_table_offset;

while (*entryptr) { /* end field has a value of zero. */

const uint8 numentries = *(entryptr++); /* number of entries in this bundle */

const uint8 bundletype = (*entryptr) & ~0x80;

const uint8 paramtypes = (*(entryptr++) & 0x80) ? 1 : 0;

printf("Bundle %d (%u entries): ", bundleid, (uint) numentries);

bundleid++;

if (paramtypes)

printf("[PARAMTYPES] ");

switch (bundletype) {

case 0x00:

printf("UNUSED\n");

printf(" %u unused entries.\n\n", (uint) numentries);

ordinal += numentries;

break;

case 0x01:

printf("16BIT\n");

printf(" Object number: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

for (uint8 i = 0; i < numentries; i++) {

printf(" %d:\n", ordinal++);

printf(" Flags:");

if (*entryptr & 0x1) printf(" EXPORTED");

printf("\n");

printf(" Parameter word count: %u\n", (uint) ((*entryptr & 0xF8) >> 3)); entryptr++;

printf(" Offset: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

printf("\n");

}

break;

case 0x02:

printf("286CALLGATE\n");

printf(" Object number: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

for (uint8 i = 0; i < numentries; i++) {

printf(" %d:\n", ordinal++);

printf(" Flags:");

if (*entryptr & 0x1) printf(" EXPORTED");

printf("\n");

printf(" Parameter word count: %u\n", (uint) ((*entryptr & 0xF8) >> 3)); entryptr++;

printf(" Offset: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

printf(" Callgate selector: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

printf("\n");

}

break;

case 0x03: printf("32BIT\n");

printf(" Object number: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

for (uint8 i = 0; i < numentries; i++) {

printf(" %d:\n", ordinal++);

printf(" Flags:");

if (*entryptr & 0x1) printf(" EXPORTED");

printf("\n");

printf(" Parameter word count: %u\n", (uint) ((*entryptr & 0xF8) >> 3)); entryptr++;

printf(" Offset: %u\n", (uint) *((const uint32 *) entryptr)); entryptr += 4;

printf("\n");

}

break;

case 0x04: printf("FORWARDER\n"); break;

printf(" Reserved field: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

for (uint8 i = 0; i < numentries; i++) {

printf(" %d:\n", ordinal++);

printf(" Flags:");

const int isordinal = (*entryptr & 0x1);

if (isordinal) printf(" IMPORTBYORDINAL");

printf("\n");

printf(" Reserved for future use: %u\n", (uint) ((*entryptr & 0xF8) >> 3)); entryptr++;

printf(" Module ordinal number: %u\n", (uint) *((const uint16 *) entryptr)); entryptr += 2;

if (isordinal) {

printf(" Import ordinal number: %u\n", (uint) *((const uint32 *) entryptr)); entryptr += 4;

} else {

printf(" Import name offset: %u\n", (uint) *((const uint32 *) entryptr)); entryptr += 4;

}

printf("\n");

}

break;

default:

printf("UNKNOWN (%u)\n\n", (uint) bundletype);

break; // !!! FIXME: what to do?

} // switch

} // while

printf("\n");

printf("Module directives (%u entries):\n", (uint) lx->num_module_directives);

const uint8 *dirptr = exe + lx->module_directives_offset;

for (uint32 i = 0; i < lx->num_module_directives; i++) {

printf("%u:\n", (uint) i+1);

printf("Directive ID: %u\n", (uint) *((const uint16 *) dirptr)); dirptr += 2;

printf("Data size: %u\n", (uint) *((const uint16 *) dirptr)); dirptr += 2;

printf("Data offset: %u\n", (uint) *((const uint32 *) dirptr)); dirptr += 4;

printf("\n");

// !!! FIXME: verify record directive table, etc, based on Directive ID

}

printf("\n");

if (lx->per_page_checksum_offset == 0) {

printf("No per-page checksums available.\n");

} else {

printf("!!! FIXME: look at per-page checksums!\n");

}

printf("\n");

printf("Import modules (%u entries):\n", (uint) lx->num_import_mod_entries);

const uint8 *import_modules_table = exe + lx->import_module_table_offset;

for (uint32 i = 0; i < lx->num_import_mod_entries; i++) {

char name[128];

const uint8 namelen = *(import_modules_table++);

// !!! FIXME: name can't be more than 127 chars, according to docs. Check this.

memcpy(name, import_modules_table, namelen);

import_modules_table += namelen;

name[namelen] = '\0';

printf("%u: %s\n", (uint) i+1, name);

}

const uint8 *name_table;

printf("Resident name table:\n");

name_table = exe + lx->resident_name_table_offset;

for (uint32 i = 0; *name_table; i++) {

const uint8 namelen = *(name_table++);

char name[256];

memcpy(name, name_table, namelen);

name[namelen] = '\0';

name_table += namelen;

const uint16 ordinal = *((const uint16 *) name_table); name_table += 2;

printf("%u: '%s' (ordinal %u)\n", (uint) i, name, (uint) ordinal);

} // for

printf("Non-resident name table:\n");

name_table = origexe + lx->non_resident_name_table_offset;

const uint8 *end_of_name_table = name_table + lx->non_resident_name_table_len;

for (uint32 i = 0; (name_table < end_of_name_table) && *name_table; i++) {

const uint8 namelen = *(name_table++);

char name[256];

memcpy(name, name_table, namelen);

name[namelen] = '\0';

name_table += namelen;

const uint16 ordinal = *((const uint16 *) name_table); name_table += 2;

printf("%u: '%s' (ordinal %u)\n", (uint) i, name, (uint) ordinal);

} // for

} // parseExe

int main(int argc, char **argv)

{

if (argc != 2) {

fprintf(stderr, "USAGE: %s <program.exe>\n", argv[0]);

return 1;

}

const char *exefname = argv[1];

FILE *io = fopen(exefname, "rb");

if (!io) {

fprintf(stderr, "can't open '%s: %s'\n", exefname, strerror(errno));

return 2;

}

if (fseek(io, 0, SEEK_END) < 0) {

fprintf(stderr, "can't seek in '%s': %s\n", exefname, strerror(errno));

return 3;

}

const uint32 exelen = ftell(io);

uint8 *exe = (uint8 *) malloc(exelen);

if (!exe) {

fprintf(stderr, "Out of memory\n");

return 4;

}

rewind(io);

if (fread(exe, exelen, 1, io) != 1) {

fprintf(stderr, "read failure on '%s': %s\n", exefname, strerror(errno));

return 5;

}

fclose(io);

parseExe(exefname, exe, exelen);

free(exe);

return 0;

} // main

// end of lx_dump.c ...