4 * Copyright 1998 Ove Kåven
6 * This code hasn't been completely cleaned up yet.
16 #include <sys/types.h>
20 #include "wine/winbase16.h"
26 #include "selectors.h"
40 /* define this to try mapping through /proc/pid/mem instead of a temp file,
41 but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
44 #define BIOS_DATA_SEGMENT 0x40
45 #define START_OFFSET 0
48 #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
49 #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
51 static void MZ_InitPSP( LPVOID lpPSP, LPCSTR cmdline, WORD env )
54 const char*cmd=cmdline?strchr(cmdline,' '):NULL;
56 psp->int20=0x20CD; /* int 20 */
57 /* some programs use this to calculate how much memory they need */
58 psp->nextParagraph=0x9FFF;
63 /* command.com doesn't do this */
64 while (*cmd == ' ') cmd++;
66 psp->cmdLine[0]=strlen(cmd);
67 strcpy(psp->cmdLine+1,cmd);
68 psp->cmdLine[psp->cmdLine[0]+1]='\r';
69 } else psp->cmdLine[1]='\r';
70 /* FIXME: integrate the memory stuff from Wine (msdos/dosmem.c) */
71 /* FIXME: integrate the PDB stuff from Wine (loader/task.c) */
74 /* default INT 08 handler: increases timer tick counter but not much more */
76 0xCD,0x1C, /* int $0x1c */
79 0xB8,0x40,0x00, /* movw $0x40,%ax */
80 0x8E,0xD8, /* movw %ax,%ds */
82 0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
83 0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
85 0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
87 0xB0,0x20, /* movb $0x20,%al */
88 0xE6,0x20, /* outb %al,$0x20 */
94 static void MZ_InitHandlers( LPDOSTASK lpDosTask )
97 LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(int08),&seg);
98 memcpy(start,int08,sizeof(int08));
99 /* INT 08: point it at our tick-incrementing handler */
100 ((SEGPTR*)(lpDosTask->img))[0x08]=PTR_SEG_OFF_TO_SEGPTR(seg,0);
101 /* INT 1C: just point it to IRET, we don't want to handle it ourselves */
102 ((SEGPTR*)(lpDosTask->img))[0x1C]=PTR_SEG_OFF_TO_SEGPTR(seg,sizeof(int08)-1);
105 static char enter_xms[]={
106 /* XMS hookable entry point */
107 0xEB,0x03, /* jmp entry */
108 0x90,0x90,0x90, /* nop;nop;nop */
110 /* real entry point */
111 /* for simplicity, we'll just use the same hook as DPMI below */
112 0xCD,0x31, /* int $0x31 */
116 static void MZ_InitXMS( LPDOSTASK lpDosTask )
118 LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_xms),&(lpDosTask->xms_seg));
119 memcpy(start,enter_xms,sizeof(enter_xms));
122 static char enter_pm[]={
123 0x50, /* pushw %ax */
124 0x52, /* pushw %dx */
125 0x55, /* pushw %bp */
126 0x89,0xE5, /* movw %sp,%bp */
128 0x8B,0x56,0x08, /* movw 8(%bp),%dx */
129 /* just call int 31 here to get into protected mode... */
130 /* it'll check whether it was called from dpmi_seg... */
131 0xCD,0x31, /* int $0x31 */
132 /* we are now in the context of a 16-bit relay call */
133 /* need to fixup our stack;
134 * 16-bit relay return address will be lost, but we won't worry quite yet */
135 0x8E,0xD0, /* movw %ax,%ss */
136 0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
138 0x89,0x56,0x08, /* movw %dx,8(%bp) */
145 static void MZ_InitDPMI( LPDOSTASK lpDosTask )
147 unsigned size=sizeof(enter_pm);
148 LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,size,&(lpDosTask->dpmi_seg));
150 lpDosTask->dpmi_sel = SELECTOR_AllocBlock( start, size, SEGMENT_CODE, FALSE, FALSE );
152 memcpy(start,enter_pm,sizeof(enter_pm));
155 static WORD MZ_InitEnvironment( LPDOSTASK lpDosTask, LPCSTR env, LPCSTR name )
162 /* get size of environment block */
163 while (env[sz++]) sz+=strlen(env+sz)+1;
166 envblk=DOSMEM_GetBlock(lpDosTask->hModule,sz+sizeof(WORD)+strlen(name)+1,&seg);
169 memcpy(envblk,env,sz);
171 /* DOS 3.x: the block contains 1 additional string */
172 *(WORD*)(envblk+sz)=1;
173 /* being the program name itself */
174 strcpy(envblk+sz+sizeof(WORD),name);
178 static BOOL MZ_InitMemory( LPDOSTASK lpDosTask, NE_MODULE *pModule )
182 if (lpDosTask->img_ofs) return TRUE; /* already allocated */
184 /* allocate 1MB+64K shared memory */
185 lpDosTask->img_ofs=START_OFFSET;
187 lpDosTask->img=VirtualAlloc(NULL,0x110000,MEM_COMMIT,PAGE_READWRITE);
188 /* make sure mmap accepts it */
189 ((char*)lpDosTask->img)[0x10FFFF]=0;
191 tmpnam(lpDosTask->mm_name);
192 /* strcpy(lpDosTask->mm_name,"/tmp/mydosimage"); */
193 lpDosTask->mm_fd=open(lpDosTask->mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
194 if (lpDosTask->mm_fd<0) ERR(module,"file %s could not be opened\n",lpDosTask->mm_name);
195 /* expand file to 1MB+64K */
196 lseek(lpDosTask->mm_fd,0x110000-1,SEEK_SET);
197 x=0; write(lpDosTask->mm_fd,&x,1);
199 lpDosTask->img=mmap(NULL,0x110000-START_OFFSET,PROT_READ|PROT_WRITE,MAP_SHARED,lpDosTask->mm_fd,0);
201 if (lpDosTask->img==(LPVOID)-1) {
202 ERR(module,"could not map shared memory, error=%s\n",strerror(errno));
205 TRACE(module,"DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img);
206 pModule->dos_image=lpDosTask->img;
208 /* initialize the memory */
209 TRACE(module,"Initializing DOS memory structures\n");
210 DOSMEM_Init(lpDosTask->hModule);
211 MZ_InitHandlers(lpDosTask);
212 MZ_InitXMS(lpDosTask);
213 MZ_InitDPMI(lpDosTask);
217 static BOOL MZ_LoadImage( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline,
218 LPCSTR env, LPDOSTASK lpDosTask, NE_MODULE *pModule )
220 IMAGE_DOS_HEADER mz_header;
221 DWORD image_start,image_size,min_size,max_size,avail;
222 BYTE*psp_start,*load_start;
227 _llseek(hFile,0,FILE_BEGIN);
228 if ((_lread(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) ||
229 (mz_header.e_magic != IMAGE_DOS_SIGNATURE)) {
230 old_com=1; /* assume .COM file */
232 image_size=GetFileSize(hFile,NULL);
233 min_size=0x10000; max_size=0x100000;
235 mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
236 mz_header.e_cs=0; mz_header.e_ip=0x100;
238 /* calculate load size */
239 image_start=mz_header.e_cparhdr<<4;
240 image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
241 if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
242 image_size-=image_start;
243 min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
244 max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
247 MZ_InitMemory(lpDosTask,pModule);
249 /* allocate environment block */
250 env_seg=MZ_InitEnvironment(lpDosTask,env,ofs->szPathName);
252 /* allocate memory for the executable */
253 TRACE(module,"Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
254 avail=DOSMEM_Available(lpDosTask->hModule);
255 if (avail<min_size) {
256 ERR(module, "insufficient DOS memory\n");
257 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
260 if (avail>max_size) avail=max_size;
261 psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&lpDosTask->psp_seg);
263 ERR(module, "error allocating DOS memory\n");
264 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
267 lpDosTask->load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
268 load_start=psp_start+(PSP_SIZE<<4);
269 MZ_InitPSP(psp_start, cmdline, env_seg);
271 /* load executable image */
272 TRACE(module,"loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
273 _llseek(hFile,image_start,FILE_BEGIN);
274 if ((_lread(hFile,load_start,image_size)) != image_size) {
275 SetLastError(ERROR_BAD_FORMAT);
279 if (mz_header.e_crlc) {
280 /* load relocation table */
281 TRACE(module,"loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
282 /* FIXME: is this too slow without read buffering? */
283 _llseek(hFile,mz_header.e_lfarlc,FILE_BEGIN);
284 for (x=0; x<mz_header.e_crlc; x++) {
285 if (_lread(hFile,&reloc,sizeof(reloc)) != sizeof(reloc)) {
286 SetLastError(ERROR_BAD_FORMAT);
289 *(WORD*)SEGPTR16(load_start,reloc)+=lpDosTask->load_seg;
293 lpDosTask->init_cs=lpDosTask->load_seg+mz_header.e_cs;
294 lpDosTask->init_ip=mz_header.e_ip;
295 lpDosTask->init_ss=lpDosTask->load_seg+mz_header.e_ss;
296 lpDosTask->init_sp=mz_header.e_sp;
298 TRACE(module,"entry point: %04x:%04x\n",lpDosTask->init_cs,lpDosTask->init_ip);
302 LPDOSTASK MZ_AllocDPMITask( HMODULE16 hModule )
304 LPDOSTASK lpDosTask = calloc(1, sizeof(DOSTASK));
308 lpDosTask->hModule = hModule;
310 pModule = (NE_MODULE *)GlobalLock16(hModule);
311 pModule->lpDosTask = lpDosTask;
313 lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
315 MZ_InitMemory(lpDosTask, pModule);
317 GlobalUnlock16(hModule);
322 static void MZ_InitTimer( LPDOSTASK lpDosTask, int ver )
326 /* start simulated system 55Hz timer */
327 lpDosTask->system_timer = CreateSystemTimer( 55, MZ_Tick );
328 TRACE(module,"created 55Hz timer tick, handle=%d\n",lpDosTask->system_timer);
334 /* start dosmod timer at 55Hz */
335 func=DOSMOD_SET_TIMER;
336 tim.tv_sec=0; tim.tv_usec=54925;
337 write(lpDosTask->write_pipe,&func,sizeof(func));
338 write(lpDosTask->write_pipe,&tim,sizeof(tim));
342 BOOL MZ_InitTask( LPDOSTASK lpDosTask )
344 int read_fd[2],write_fd[2];
346 char *fname,*farg,arg[16],fproc[64],path[256],*fpath;
348 if (!lpDosTask) return FALSE;
349 /* create read pipe */
350 if (pipe(read_fd)<0) return FALSE;
351 if (pipe(write_fd)<0) {
352 close(read_fd[0]); close(read_fd[1]); return FALSE;
354 lpDosTask->read_pipe=read_fd[0];
355 lpDosTask->write_pipe=write_fd[1];
356 /* if we have a mapping file, use it */
357 fname=lpDosTask->mm_name; farg=NULL;
359 /* otherwise, map our own memory image */
360 sprintf(fproc,"/proc/%d/mem",getpid());
361 sprintf(arg,"%ld",(unsigned long)lpDosTask->img);
362 fname=fproc; farg=arg;
365 TRACE(module,"Loading DOS VM support module (hmodule=%04x)\n",lpDosTask->hModule);
366 if ((child=fork())<0) {
367 close(write_fd[0]); close(write_fd[1]);
368 close(read_fd[0]); close(read_fd[1]); return FALSE;
374 close(read_fd[1]); close(write_fd[0]);
375 lpDosTask->task=child;
376 /* wait for child process to signal readiness */
378 if (read(lpDosTask->read_pipe,&ret,sizeof(ret))!=sizeof(ret)) {
379 if ((errno==EINTR)||(errno==EAGAIN)) continue;
381 ERR(module,"dosmod has failed to initialize\n");
382 if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
386 /* the child has now mmaped the temp file, it's now safe to unlink.
387 * do it here to avoid leaving a mess in /tmp if/when Wine crashes... */
388 if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
389 /* start simulated system timer */
390 MZ_InitTimer(lpDosTask,ret);
391 /* all systems are now go */
394 close(read_fd[0]); close(write_fd[1]);
395 /* put our pipes somewhere dosmod can find them */
396 dup2(write_fd[0],0); /* stdin */
397 dup2(read_fd[1],1); /* stdout */
399 SIGNAL_MaskAsyncEvents(FALSE);
400 /* now load dosmod */
401 execlp("dosmod",fname,farg,NULL);
402 execl("dosmod",fname,farg,NULL);
403 /* hmm, they didn't install properly */
404 execl("loader/dos/dosmod",fname,farg,NULL);
405 /* last resort, try to find it through argv[0] */
406 fpath=strrchr(strcpy(path,Options.argv0),'/');
408 strcpy(fpath,"/loader/dos/dosmod");
409 execl(path,fname,farg,NULL);
411 /* if failure, exit */
412 ERR(module,"Failed to spawn dosmod, error=%s\n",strerror(errno));
418 BOOL MZ_CreateProcess( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline, LPCSTR env,
419 LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
420 BOOL inherit, LPSTARTUPINFOA startup,
421 LPPROCESS_INFORMATION info )
423 LPDOSTASK lpDosTask = NULL; /* keep gcc from complaining */
425 PDB *pdb = PROCESS_Current();
426 TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
427 NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
428 int alloc = !(pModule && pModule->dos_image);
430 if (alloc && (lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL) {
431 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
435 if ((!env)&&pdb) env = pdb->env_db->environ;
437 if ((hModule = MODULE_CreateDummyModule(ofs, NULL)) < 32) {
438 SetLastError(hModule);
441 lpDosTask->hModule = hModule;
443 pModule = (NE_MODULE *)GlobalLock16(hModule);
444 pModule->lpDosTask = lpDosTask;
446 lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
447 } else lpDosTask=pModule->lpDosTask;
448 if (!MZ_LoadImage( hFile, ofs, cmdline, env, lpDosTask, pModule )) {
450 if (lpDosTask->mm_name[0]!=0) {
451 if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET);
452 if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd);
453 unlink(lpDosTask->mm_name);
455 if (lpDosTask->img!=NULL) VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
460 pModule->dos_image = lpDosTask->img;
461 if (!MZ_InitTask( lpDosTask )) {
462 MZ_KillModule( lpDosTask );
463 /* FIXME: cleanup hModule */
464 SetLastError(ERROR_GEN_FAILURE);
467 if (!PROCESS_Create( pModule, cmdline, env, 0, 0,
468 psa, tsa, inherit, startup, info ))
474 void MZ_KillModule( LPDOSTASK lpDosTask )
476 TRACE(module,"killing DOS task\n");
478 SYSTEM_KillSystemTimer(lpDosTask->system_timer);
480 if (lpDosTask->mm_name[0]!=0) {
481 munmap(lpDosTask->img,0x110000-START_OFFSET);
482 close(lpDosTask->mm_fd);
483 } else VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
484 close(lpDosTask->read_pipe);
485 close(lpDosTask->write_pipe);
486 kill(lpDosTask->task,SIGTERM);
488 /* FIXME: this seems to crash */
489 if (lpDosTask->dpmi_sel)
490 UnMapLS(PTR_SEG_OFF_TO_SEGPTR(lpDosTask->dpmi_sel,0));
494 #else /* !MZ_SUPPORTED */
496 BOOL MZ_CreateProcess( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline, LPCSTR env,
497 LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
498 BOOL inherit, LPSTARTUPINFOA startup,
499 LPPROCESS_INFORMATION info )
501 WARN(module,"DOS executables not supported on this architecture\n");
502 SetLastError(ERROR_BAD_FORMAT);