4 * Copyright 1998 Ove Kåven
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * Note: This code hasn't been completely cleaned up yet.
24 #include "wine/port.h"
33 #include <sys/types.h>
37 #include "wine/winbase16.h"
45 #include "wine/debug.h"
51 WINE_DEFAULT_DEBUG_CHANNEL(module);
55 #ifdef HAVE_SYS_MMAN_H
56 # include <sys/mman.h>
59 /* define this to try mapping through /proc/pid/mem instead of a temp file,
60 but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
63 #define BIOS_DATA_SEGMENT 0x40
66 #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
67 #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
69 /* structures for EXEC */
73 DWORD cmdline WINE_PACKED;
74 DWORD fcb1 WINE_PACKED;
75 DWORD fcb2 WINE_PACKED;
87 /* global variables */
91 static WORD init_cs,init_ip,init_ss,init_sp;
92 static HANDLE dosvm_thread, loop_thread;
93 static DWORD dosvm_tid, loop_tid;
95 static void MZ_Launch(void);
96 static BOOL MZ_InitTask(void);
98 static void MZ_CreatePSP( LPVOID lpPSP, WORD env, WORD par )
102 psp->int20=0x20CD; /* int 20 */
103 /* some programs use this to calculate how much memory they need */
104 psp->nextParagraph=0x9FFF; /* FIXME: use a real value */
105 /* FIXME: dispatcher */
106 psp->savedint22 = DOSVM_GetRMHandler(0x22);
107 psp->savedint23 = DOSVM_GetRMHandler(0x23);
108 psp->savedint24 = DOSVM_GetRMHandler(0x24);
110 psp->environment=env;
111 /* FIXME: more PSP stuff */
114 static void MZ_FillPSP( LPVOID lpPSP, LPBYTE cmdline, int length )
118 while(length > 0 && *cmdline != ' ') {
123 /* command.com does not skip over multiple spaces */
126 ERR("Command line truncated! (length %d > maximum length 126)\n",
131 psp->cmdLine[0] = length;
133 memmove(psp->cmdLine+1, cmdline, length);
134 psp->cmdLine[length+1] = '\r';
136 /* FIXME: more PSP stuff */
139 /* default INT 08 handler: increases timer tick counter but not much more */
140 static char int08[]={
141 0xCD,0x1C, /* int $0x1c */
142 0x50, /* pushw %ax */
143 0x1E, /* pushw %ds */
144 0xB8,0x40,0x00, /* movw $0x40,%ax */
145 0x8E,0xD8, /* movw %ax,%ds */
147 0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
148 0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
150 0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
152 0xB0,0x20, /* movb $0x20,%al */
153 0xE6,0x20, /* outb %al,$0x20 */
159 static void MZ_InitHandlers(void)
162 LPBYTE start=DOSMEM_GetBlock(sizeof(int08),&seg);
163 memcpy(start,int08,sizeof(int08));
164 /* INT 08: point it at our tick-incrementing handler */
165 ((SEGPTR*)0)[0x08]=MAKESEGPTR(seg,0);
166 /* INT 1C: just point it to IRET, we don't want to handle it ourselves */
167 ((SEGPTR*)0)[0x1C]=MAKESEGPTR(seg,sizeof(int08)-1);
170 static WORD MZ_InitEnvironment( LPCSTR env, LPCSTR name )
177 /* get size of environment block */
178 while (env[sz++]) sz+=strlen(env+sz)+1;
181 envblk=DOSMEM_GetBlock(sz+sizeof(WORD)+strlen(name)+1,&seg);
184 memcpy(envblk,env,sz);
186 /* DOS 3.x: the block contains 1 additional string */
187 *(WORD*)(envblk+sz)=1;
188 /* being the program name itself */
189 strcpy(envblk+sz+sizeof(WORD),name);
193 static BOOL MZ_InitMemory(void)
195 /* initialize the memory */
196 TRACE("Initializing DOS memory structures\n");
203 static BOOL MZ_DoLoadImage( HANDLE hFile, LPCSTR filename, OverlayBlock *oblk )
205 IMAGE_DOS_HEADER mz_header;
206 DWORD image_start,image_size,min_size,max_size,avail;
207 BYTE*psp_start,*load_start,*oldenv;
208 int x, old_com=0, alloc;
210 WORD env_seg, load_seg, rel_seg, oldpsp_seg;
214 /* DOS process already running, inherit from it */
215 PDB16* par_psp = (PDB16*)((DWORD)DOSVM_psp << 4);
217 oldenv = (LPBYTE)((DWORD)par_psp->environment << 4);
218 oldpsp_seg = DOSVM_psp;
220 /* allocate new DOS process, inheriting from Wine environment */
222 oldenv = GetEnvironmentStringsA();
226 SetFilePointer(hFile,0,NULL,FILE_BEGIN);
227 if ( !ReadFile(hFile,&mz_header,sizeof(mz_header),&len,NULL)
228 || len != sizeof(mz_header)
229 || mz_header.e_magic != IMAGE_DOS_SIGNATURE) {
230 char *p = strrchr( filename, '.' );
231 if (!p || strcasecmp( p, ".com" )) /* check for .COM extension */
233 SetLastError(ERROR_BAD_FORMAT);
236 old_com=1; /* assume .COM file */
238 image_size=GetFileSize(hFile,NULL);
239 min_size=0x10000; max_size=0x100000;
241 mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
242 mz_header.e_cs=0; mz_header.e_ip=0x100;
244 /* calculate load size */
245 image_start=mz_header.e_cparhdr<<4;
246 image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
247 if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
248 image_size-=image_start;
249 min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
250 max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
253 if (alloc) MZ_InitMemory();
256 /* load overlay into preallocated memory */
257 load_seg=oblk->load_seg;
258 rel_seg=oblk->rel_seg;
259 load_start=(LPBYTE)((DWORD)load_seg<<4);
261 /* allocate environment block */
262 env_seg=MZ_InitEnvironment(oldenv, filename);
264 /* allocate memory for the executable */
265 TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
266 avail=DOSMEM_Available();
267 if (avail<min_size) {
268 ERR("insufficient DOS memory\n");
269 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
272 if (avail>max_size) avail=max_size;
273 psp_start=DOSMEM_GetBlock(avail,&DOSVM_psp);
275 ERR("error allocating DOS memory\n");
276 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
279 load_seg=DOSVM_psp+(old_com?0:PSP_SIZE);
281 load_start=psp_start+(PSP_SIZE<<4);
282 MZ_CreatePSP(psp_start, env_seg, oldpsp_seg);
285 /* load executable image */
286 TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
287 SetFilePointer(hFile,image_start,NULL,FILE_BEGIN);
288 if (!ReadFile(hFile,load_start,image_size,&len,NULL) || len != image_size) {
289 SetLastError(ERROR_BAD_FORMAT);
293 if (mz_header.e_crlc) {
294 /* load relocation table */
295 TRACE("loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
296 /* FIXME: is this too slow without read buffering? */
297 SetFilePointer(hFile,mz_header.e_lfarlc,NULL,FILE_BEGIN);
298 for (x=0; x<mz_header.e_crlc; x++) {
299 if (!ReadFile(hFile,&reloc,sizeof(reloc),&len,NULL) || len != sizeof(reloc)) {
300 SetLastError(ERROR_BAD_FORMAT);
303 *(WORD*)SEGPTR16(load_start,reloc)+=rel_seg;
308 init_cs = load_seg+mz_header.e_cs;
309 init_ip = mz_header.e_ip;
310 init_ss = load_seg+mz_header.e_ss;
311 init_sp = mz_header.e_sp;
313 TRACE("entry point: %04x:%04x\n",init_cs,init_ip);
316 if (alloc && !MZ_InitTask()) {
317 SetLastError(ERROR_GEN_FAILURE);
324 DOSVM_psp = oldpsp_seg;
329 /***********************************************************************
330 * LoadDosExe (WINEDOS.@)
332 void WINAPI MZ_LoadImage( LPCSTR filename, HANDLE hFile )
334 if (MZ_DoLoadImage( hFile, filename, NULL )) MZ_Launch();
337 /***********************************************************************
340 BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
342 /* this may only be called from existing DOS processes
343 * (i.e. one DOS app spawning another) */
344 /* FIXME: do we want to check binary type first, to check
345 * whether it's a NE/PE executable? */
346 HFILE hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
347 NULL, OPEN_EXISTING, 0, 0);
349 if (hFile == INVALID_HANDLE_VALUE) return FALSE;
351 case 0: /* load and execute */
352 case 1: /* load but don't execute */
354 /* save current process's return SS:SP now */
355 LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
356 PDB16 *psp = (PDB16 *)psp_start;
357 psp->saveStack = (DWORD)MAKESEGPTR(context->SegSs, LOWORD(context->Esp));
359 ret = MZ_DoLoadImage( hFile, filename, NULL );
361 /* MZ_LoadImage created a new PSP and loaded new values into it,
362 * let's work on the new values now */
363 LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
364 ExecBlock *blk = (ExecBlock *)paramblk;
365 LPBYTE cmdline = DOSMEM_MapRealToLinear(blk->cmdline);
367 /* First character contains the length of the command line. */
368 MZ_FillPSP(psp_start, cmdline + 1, cmdline[0]);
370 /* the lame MS-DOS engineers decided that the return address should be in int22 */
371 DOSVM_SetRMHandler(0x22, (FARPROC16)MAKESEGPTR(context->SegCs, LOWORD(context->Eip)));
373 /* don't execute, just return startup state */
374 blk->init_cs = init_cs;
375 blk->init_ip = init_ip;
376 blk->init_ss = init_ss;
377 blk->init_sp = init_sp;
379 /* execute by making us return to new process */
380 context->SegCs = init_cs;
381 context->Eip = init_ip;
382 context->SegSs = init_ss;
383 context->Esp = init_sp;
384 context->SegDs = DOSVM_psp;
385 context->SegEs = DOSVM_psp;
390 case 3: /* load overlay */
392 OverlayBlock *blk = (OverlayBlock *)paramblk;
393 ret = MZ_DoLoadImage( hFile, filename, blk );
397 FIXME("EXEC load type %d not implemented\n", func);
398 SetLastError(ERROR_INVALID_FUNCTION);
405 /***********************************************************************
408 void WINAPI MZ_AllocDPMITask( void )
414 /***********************************************************************
417 void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
425 event = CreateEventA(NULL, TRUE, FALSE, NULL);
426 PostThreadMessageA(loop_tid, WM_USER, event, (LPARAM)&spc);
427 WaitForSingleObject(event, INFINITE);
433 static DWORD WINAPI MZ_DOSVM( LPVOID lpExtra )
438 dosvm_pid = getpid();
440 memset( &context, 0, sizeof(context) );
441 context.SegCs = init_cs;
442 context.Eip = init_ip;
443 context.SegSs = init_ss;
444 context.Esp = init_sp;
445 context.SegDs = DOSVM_psp;
446 context.SegEs = DOSVM_psp;
447 context.EFlags = 0x00080000; /* virtual interrupt flag */
448 DOSVM_SetTimer(0x10000);
449 ret = DOSVM_Enter( &context );
455 static BOOL MZ_InitTask(void)
457 if (!DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
458 GetCurrentProcess(), &loop_thread,
459 0, FALSE, DUPLICATE_SAME_ACCESS))
461 dosvm_thread = CreateThread(NULL, 0, MZ_DOSVM, NULL, CREATE_SUSPENDED, &dosvm_tid);
463 CloseHandle(loop_thread);
467 loop_tid = GetCurrentThreadId();
471 static void MZ_Launch(void)
473 TDB *pTask = TASK_GetCurrent();
474 BYTE *psp_start = PTR_REAL_TO_LIN( DOSVM_psp, 0 );
475 LPSTR cmdline = GetCommandLineA();
478 MZ_FillPSP(psp_start, cmdline, cmdline ? strlen(cmdline) : 0);
479 pTask->flags |= TDBF_WINOLDAP;
483 ResumeThread(dosvm_thread);
484 rv = DOSVM_Loop(dosvm_thread);
486 CloseHandle(dosvm_thread);
487 dosvm_thread = 0; dosvm_tid = 0;
488 CloseHandle(loop_thread);
489 loop_thread = 0; loop_tid = 0;
495 /***********************************************************************
498 void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
501 WORD psp_seg = cs_psp ? context->SegCs : DOSVM_psp;
502 LPBYTE psp_start = (LPBYTE)((DWORD)psp_seg << 4);
503 PDB16 *psp = (PDB16 *)psp_start;
504 WORD parpsp = psp->parentPSP; /* check for parent DOS process */
506 /* retrieve parent's return address */
507 FARPROC16 retaddr = DOSVM_GetRMHandler(0x22);
508 /* restore interrupts */
509 DOSVM_SetRMHandler(0x22, psp->savedint22);
510 DOSVM_SetRMHandler(0x23, psp->savedint23);
511 DOSVM_SetRMHandler(0x24, psp->savedint24);
512 /* FIXME: deallocate file handles etc */
513 /* free process's associated memory
514 * FIXME: walk memory and deallocate all blocks owned by process */
515 DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(MAKELONG(0,psp->environment)));
516 DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(MAKELONG(0,DOSVM_psp)));
517 /* switch to parent's PSP */
519 psp_start = (LPBYTE)((DWORD)parpsp << 4);
520 psp = (PDB16 *)psp_start;
521 /* now return to parent */
522 DOSVM_retval = retval;
523 context->SegCs = SELECTOROF(retaddr);
524 context->Eip = OFFSETOF(retaddr);
525 context->SegSs = SELECTOROF(psp->saveStack);
526 context->Esp = OFFSETOF(psp->saveStack);
529 TRACE("killing DOS task\n");
531 ExitThread( retval );
535 /***********************************************************************
538 BOOL WINAPI MZ_Current( void )
540 return (dosvm_pid != 0); /* FIXME: do a better check */
543 #else /* !MZ_SUPPORTED */
545 /***********************************************************************
546 * LoadDosExe (WINEDOS.@)
548 void WINAPI MZ_LoadImage( LPCSTR filename, HANDLE hFile )
550 WARN("DOS executables not supported on this platform\n");
551 SetLastError(ERROR_BAD_FORMAT);
554 /***********************************************************************
557 BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
560 SetLastError(ERROR_BAD_FORMAT);
564 /***********************************************************************
567 void WINAPI MZ_AllocDPMITask( void )
569 ERR("Actual real-mode calls not supported on this platform!\n");
572 /***********************************************************************
575 void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
577 ExitThread( retval );
580 /***********************************************************************
583 BOOL WINAPI MZ_Current( void )
588 #endif /* !MZ_SUPPORTED */