| /* |
| * DOS (MZ) loader |
| * |
| * Copyright 1998 Ove Kåven |
| */ |
| |
| #ifdef linux |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #ifdef MZ_USESYSV |
| #include <sys/ipc.h> |
| #include <sys/shm.h> |
| #else |
| #include <sys/mman.h> |
| #endif |
| #include <sys/vm86.h> |
| #ifdef MZ_USESYSV |
| #include <linux/mm.h> /* FIXME: where else should I fetch the PAGE_SIZE define? */ |
| #endif |
| #include "windows.h" |
| #include "winbase.h" |
| #include "module.h" |
| #include "task.h" |
| #include "ldt.h" |
| #include "process.h" |
| #include "miscemu.h" |
| #include "debug.h" |
| #include "dosexe.h" |
| |
| #define BIOS_DATA_SEGMENT 0x40 |
| #define BIOS_SEGMENT BIOSSEG /* BIOSSEG is defined to 0xf000 in sys/vm86.h */ |
| #define STUB_SEGMENT BIOS_SEGMENT |
| #ifdef MZ_USESYSV |
| /* it might be that SYSV supports START_OFFSET 0 after all, haven't checked */ |
| #define START_OFFSET PAGE_SIZE |
| #else |
| #define START_OFFSET 0 |
| #endif |
| #define PSP_SIZE 0x10 |
| |
| #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4))) |
| #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr))) |
| |
| #define STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */ |
| |
| static void MZ_InitSystem( LPVOID lpImage ) |
| { |
| SEGPTR*isr=lpImage; |
| DWORD*stub=SEG16(lpImage,STUB_SEGMENT); |
| int x; |
| |
| /* initialize ISR table to make it point to INT stubs in BIOSSEG; |
| Linux only sends INTs performed from or destined to BIOSSEG at us, |
| if the int_revectored table is empty. |
| This allows DOS programs to hook interrupts, as well as use their |
| familiar retf tricks to call them... */ |
| /* (note that the hooking might not actually work since DOS3Call stuff |
| isn't fully integrated with the DOS VM yet...) */ |
| TRACE(module,"Initializing interrupt vector table\n"); |
| for (x=0; x<256; x++) isr[x]=PTR_SEG_OFF_TO_SEGPTR(STUB_SEGMENT,x*4); |
| TRACE(module,"Initializing interrupt stub table\n"); |
| for (x=0; x<256; x++) stub[x]=STUB(x); |
| } |
| |
| static void MZ_InitPSP( LPVOID lpPSP, LPCSTR cmdline, LPCSTR env ) |
| { |
| PDB*psp=lpPSP; |
| const char*cmd=cmdline?strchr(cmdline,' '):NULL; |
| |
| psp->int20=0x20CD; /* int 20 */ |
| /* some programs use this to calculate how much memory they need */ |
| psp->nextParagraph=0x9FFF; |
| /* copy parameters */ |
| if (cmd) { |
| while (*cmd == ' ') cmd++; |
| psp->cmdLine[0]=strlen(cmd); |
| strcpy(psp->cmdLine+1,cmd); |
| psp->cmdLine[psp->cmdLine[0]+1]='\r'; |
| } else psp->cmdLine[1]='\r'; |
| /* FIXME: integrate the memory stuff from Wine (msdos/dosmem.c) */ |
| /* FIXME: integrate the PDB stuff from Wine (loader/task.c) */ |
| } |
| |
| static int MZ_LoadImage( HFILE16 hFile, LPCSTR cmdline, LPCSTR env, LPDOSTASK lpDosTask ) |
| { |
| IMAGE_DOS_HEADER mz_header; |
| DWORD image_start,image_size,min_size,max_size,avail; |
| WORD psp_seg,load_seg; |
| BYTE*psp_start,*load_start; |
| int x; |
| SEGPTR reloc; |
| |
| if ((_hread16(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) || |
| (mz_header.e_magic != IMAGE_DOS_SIGNATURE)) |
| return 11; /* invalid exe */ |
| /* calculate load size */ |
| image_start=mz_header.e_cparhdr<<4; |
| image_size=mz_header.e_cp<<9; /* pages are 512 bytes */ |
| if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp; |
| image_size-=image_start; |
| min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4); |
| max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4); |
| |
| /* allocate 1MB+64K shared memory */ |
| lpDosTask->img_ofs=START_OFFSET; |
| #ifdef MZ_USESYSV |
| lpDosTask->key=ftok(".",'d'); /* FIXME: this is from my IPC intro doc */ |
| lpDosTask->shm_id=shmget(lpDosTask->key,0x110000-START_OFFSET,IPC_CREAT|SHM_R|SHM_W); |
| lpDosTask->img=shmat(lpDosTask->shm_id,NULL,0); |
| #else |
| tmpnam(lpDosTask->mm_name); |
| /* strcpy(lpDosTask->mm_name,"/tmp/mydosimage"); */ |
| lpDosTask->mm_fd=open(lpDosTask->mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR); |
| if (lpDosTask->mm_fd<0) ERR(module,"file %s could not be opened\n",lpDosTask->mm_name); |
| /* expand file to 1MB+64K */ |
| lseek(lpDosTask->mm_fd,0x110000-1,SEEK_SET); |
| x=0; write(lpDosTask->mm_fd,&x,1); |
| /* map it in */ |
| lpDosTask->img=mmap(NULL,0x110000-START_OFFSET,PROT_READ|PROT_WRITE,MAP_SHARED,lpDosTask->mm_fd,0); |
| #endif |
| if (lpDosTask->img==(LPVOID)-1) { |
| ERR(module,"could not map shared memory, error=%s\n",strerror(errno)); |
| return 0; |
| } |
| TRACE(module,"DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img); |
| |
| /* initialize the memory */ |
| MZ_InitSystem(lpDosTask->img); |
| TRACE(module,"Initializing DOS memory structures\n"); |
| DOSMEM_Init(lpDosTask->hModule); |
| |
| /* FIXME: allocate memory for environment variables */ |
| |
| /* allocate memory for the executable */ |
| TRACE(module,"Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size); |
| avail=DOSMEM_Available(lpDosTask->hModule); |
| if (avail<min_size) { |
| ERR(module, "insufficient DOS memory\n"); |
| return 0; |
| } |
| if (avail>max_size) avail=max_size; |
| psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&psp_seg); |
| if (!psp_start) { |
| ERR(module, "error allocating DOS memory\n"); |
| return 0; |
| } |
| load_seg=psp_seg+PSP_SIZE; |
| load_start=psp_start+(PSP_SIZE<<4); |
| MZ_InitPSP(psp_start, cmdline, env); |
| |
| /* load executable image */ |
| TRACE(module,"loading DOS EXE image size, %08lx bytes\n",image_size); |
| _llseek16(hFile,image_start,FILE_BEGIN); |
| if ((_hread16(hFile,load_start,image_size)) != image_size) |
| return 11; /* invalid exe */ |
| |
| /* load relocation table */ |
| TRACE(module,"loading DOS EXE relocation table, %d entries\n",mz_header.e_lfarlc); |
| /* FIXME: is this too slow without read buffering? */ |
| _llseek16(hFile,mz_header.e_lfarlc,FILE_BEGIN); |
| for (x=0; x<mz_header.e_crlc; x++) { |
| if (_lread16(hFile,&reloc,sizeof(reloc)) != sizeof(reloc)) |
| return 11; /* invalid exe */ |
| *(WORD*)SEGPTR16(load_start,reloc)+=load_seg; |
| } |
| |
| /* initialize vm86 struct */ |
| memset(&lpDosTask->VM86,0,sizeof(lpDosTask->VM86)); |
| lpDosTask->VM86.regs.cs=load_seg+mz_header.e_cs; |
| lpDosTask->VM86.regs.eip=mz_header.e_ip; |
| lpDosTask->VM86.regs.ss=load_seg+mz_header.e_ss; |
| lpDosTask->VM86.regs.esp=mz_header.e_sp; |
| lpDosTask->VM86.regs.ds=psp_seg; |
| lpDosTask->VM86.regs.es=psp_seg; |
| /* hmm, what else do we need? */ |
| |
| return 32; |
| } |
| |
| static int MZ_InitTask( LPDOSTASK lpDosTask ) |
| { |
| int read_fd[2],write_fd[2]; |
| pid_t child; |
| |
| /* create read pipe */ |
| if (pipe(read_fd)<0) return 0; |
| if (pipe(write_fd)<0) { |
| close(read_fd[0]); close(read_fd[1]); return 0; |
| } |
| lpDosTask->read_pipe=read_fd[0]; |
| lpDosTask->write_pipe=write_fd[1]; |
| lpDosTask->fn=VM86_ENTER; |
| lpDosTask->state=1; |
| TRACE(module,"Preparing to load DOS EXE support module: forking\n"); |
| if ((child=fork())<0) { |
| close(write_fd[0]); close(write_fd[1]); |
| close(read_fd[0]); close(read_fd[1]); return 0; |
| } |
| if (child!=0) { |
| /* parent process */ |
| close(read_fd[1]); close(write_fd[0]); |
| lpDosTask->task=child; |
| } else { |
| /* child process */ |
| close(read_fd[0]); close(write_fd[1]); |
| /* put our pipes somewhere dosmod can find them */ |
| dup2(write_fd[0],0); /* stdin */ |
| dup2(read_fd[1],1); /* stdout */ |
| /* now load dosmod */ |
| execlp("dosmod",lpDosTask->mm_name,NULL); |
| execl("dosmod",lpDosTask->mm_name,NULL); |
| execl("loader/dos/dosmod",lpDosTask->mm_name,NULL); |
| /* if failure, exit */ |
| ERR(module,"Failed to spawn dosmod, error=%s\n",strerror(errno)); |
| exit(1); |
| } |
| return 32; |
| } |
| |
| HINSTANCE16 MZ_LoadModule( LPCSTR name, LPCSTR cmdline, |
| LPCSTR env, UINT16 show_cmd ) |
| { |
| LPDOSTASK lpDosTask; |
| HMODULE16 hModule; |
| HINSTANCE16 hInstance; |
| NE_MODULE *pModule; |
| HFILE16 hFile; |
| OFSTRUCT ofs; |
| PROCESS_INFORMATION info; |
| int err; |
| |
| if ((lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL) |
| return 0; |
| |
| if ((hFile = OpenFile16( name, &ofs, OF_READ )) == HFILE_ERROR16) |
| return 2; /* File not found */ |
| |
| if ((hModule = MODULE_CreateDummyModule(&ofs)) < 32) |
| return hModule; |
| |
| lpDosTask->hModule = hModule; |
| |
| pModule = (NE_MODULE *)GlobalLock16(hModule); |
| pModule->lpDosTask = lpDosTask; |
| |
| lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1; |
| err = MZ_LoadImage( hFile, cmdline, env, lpDosTask ); |
| _lclose16(hFile); |
| if (err<32) { |
| if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET); |
| if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd); |
| if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name); |
| return err; |
| } |
| MZ_InitTask( lpDosTask ); |
| |
| hInstance = NE_CreateInstance(pModule, NULL, (cmdline == NULL)); |
| PROCESS_Create( pModule, cmdline, env, hInstance, 0, show_cmd, &info ); |
| /* we don't need the handles for now */ |
| CloseHandle( info.hThread ); |
| CloseHandle( info.hProcess ); |
| return hInstance; |
| } |
| |
| void MZ_KillModule( LPDOSTASK lpDosTask ) |
| { |
| munmap(lpDosTask->img,0x110000-START_OFFSET); |
| close(lpDosTask->mm_fd); |
| unlink(lpDosTask->mm_name); |
| close(lpDosTask->read_pipe); |
| close(lpDosTask->write_pipe); |
| kill(lpDosTask->task,SIGTERM); |
| } |
| |
| int MZ_RunModule( LPDOSTASK lpDosTask ) |
| { |
| /* transmit the current context structure to the DOS task */ |
| if (lpDosTask->state==1) { |
| if (write(lpDosTask->write_pipe,&lpDosTask->fn,sizeof(lpDosTask->fn))!=sizeof(lpDosTask->fn)) |
| return -1; |
| if (write(lpDosTask->write_pipe,&lpDosTask->VM86,sizeof(lpDosTask->VM86))!=sizeof(lpDosTask->VM86)) |
| return -1; |
| lpDosTask->state=2; |
| } |
| /* wait for another context structure to appear (this may block) */ |
| if (lpDosTask->state==2) { |
| if (read(lpDosTask->read_pipe,&lpDosTask->fn,sizeof(lpDosTask->fn))!=sizeof(lpDosTask->fn)) { |
| if ((errno==EINTR)||(errno==EAGAIN)) return 0; |
| return -1; |
| } |
| lpDosTask->state=3; |
| } |
| if (lpDosTask->state==3) { |
| if (read(lpDosTask->read_pipe,&lpDosTask->VM86,sizeof(lpDosTask->VM86))!=sizeof(lpDosTask->VM86)) { |
| if ((errno==EINTR)||(errno==EAGAIN)) return 0; |
| return -1; |
| } |
| /* got one */ |
| lpDosTask->state=1; |
| return 1; |
| } |
| return 0; |
| } |
| |
| #endif /* linux */ |