650 lines
18 KiB
C
650 lines
18 KiB
C
/*
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* DOS (MZ) loader
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*
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* Copyright 1998 Ove Kåven
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*
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* This code hasn't been completely cleaned up yet.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include "windef.h"
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#include "wine/winbase16.h"
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#include "winerror.h"
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#include "module.h"
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#include "task.h"
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#include "file.h"
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#include "miscemu.h"
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#include "debugtools.h"
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#include "dosexe.h"
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#include "../../loader/dos/dosmod.h"
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#include "options.h"
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#include "vga.h"
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DEFAULT_DEBUG_CHANNEL(module);
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static LPDOSTASK dos_current;
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#ifdef MZ_SUPPORTED
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#ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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#endif
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/* define this to try mapping through /proc/pid/mem instead of a temp file,
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but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
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#undef MZ_MAPSELF
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#define BIOS_DATA_SEGMENT 0x40
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#define PSP_SIZE 0x10
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#define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
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#define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
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/* structures for EXEC */
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typedef struct {
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WORD env_seg;
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DWORD cmdline WINE_PACKED;
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DWORD fcb1 WINE_PACKED;
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DWORD fcb2 WINE_PACKED;
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WORD init_sp;
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WORD init_ss;
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WORD init_ip;
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WORD init_cs;
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} ExecBlock;
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typedef struct {
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WORD load_seg;
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WORD rel_seg;
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} OverlayBlock;
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/* global variables */
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static WORD init_cs,init_ip,init_ss,init_sp;
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static char mm_name[128];
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int read_pipe, write_pipe;
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HANDLE hReadPipe, hWritePipe;
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pid_t dosmod_pid;
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static void MZ_Launch(void);
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static BOOL MZ_InitTask(void);
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static void MZ_KillTask(void);
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static void MZ_CreatePSP( LPVOID lpPSP, WORD env, WORD par )
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{
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PDB16*psp=lpPSP;
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psp->int20=0x20CD; /* int 20 */
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/* some programs use this to calculate how much memory they need */
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psp->nextParagraph=0x9FFF; /* FIXME: use a real value */
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/* FIXME: dispatcher */
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psp->savedint22 = INT_GetRMHandler(0x22);
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psp->savedint23 = INT_GetRMHandler(0x23);
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psp->savedint24 = INT_GetRMHandler(0x24);
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psp->parentPSP=par;
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psp->environment=env;
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/* FIXME: more PSP stuff */
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}
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static void MZ_FillPSP( LPVOID lpPSP, LPCSTR cmdline )
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{
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PDB16*psp=lpPSP;
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const char*cmd=cmdline?strchr(cmdline,' '):NULL;
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/* copy parameters */
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if (cmd) {
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#if 0
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/* command.com doesn't do this */
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while (*cmd == ' ') cmd++;
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#endif
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psp->cmdLine[0]=strlen(cmd);
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strcpy(psp->cmdLine+1,cmd);
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psp->cmdLine[psp->cmdLine[0]+1]='\r';
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} else psp->cmdLine[1]='\r';
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/* FIXME: more PSP stuff */
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}
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/* default INT 08 handler: increases timer tick counter but not much more */
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static char int08[]={
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0xCD,0x1C, /* int $0x1c */
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0x50, /* pushw %ax */
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0x1E, /* pushw %ds */
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0xB8,0x40,0x00, /* movw $0x40,%ax */
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0x8E,0xD8, /* movw %ax,%ds */
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#if 0
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0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
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0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
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#else
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0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
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#endif
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0xB0,0x20, /* movb $0x20,%al */
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0xE6,0x20, /* outb %al,$0x20 */
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0x1F, /* popw %ax */
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0x58, /* popw %ax */
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0xCF /* iret */
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};
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static void MZ_InitHandlers(void)
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{
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WORD seg;
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LPBYTE start=DOSMEM_GetBlock(sizeof(int08),&seg);
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memcpy(start,int08,sizeof(int08));
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/* INT 08: point it at our tick-incrementing handler */
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((SEGPTR*)0)[0x08]=MAKESEGPTR(seg,0);
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/* INT 1C: just point it to IRET, we don't want to handle it ourselves */
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((SEGPTR*)0)[0x1C]=MAKESEGPTR(seg,sizeof(int08)-1);
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}
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static WORD MZ_InitEnvironment( LPCSTR env, LPCSTR name )
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{
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unsigned sz=0;
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WORD seg;
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LPSTR envblk;
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if (env) {
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/* get size of environment block */
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while (env[sz++]) sz+=strlen(env+sz)+1;
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} else sz++;
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/* allocate it */
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envblk=DOSMEM_GetBlock(sz+sizeof(WORD)+strlen(name)+1,&seg);
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/* fill it */
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if (env) {
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memcpy(envblk,env,sz);
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} else envblk[0]=0;
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/* DOS 3.x: the block contains 1 additional string */
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*(WORD*)(envblk+sz)=1;
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/* being the program name itself */
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strcpy(envblk+sz+sizeof(WORD),name);
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return seg;
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}
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static BOOL MZ_InitMemory(void)
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{
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int mm_fd;
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void *img_base;
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/* initialize the memory */
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TRACE("Initializing DOS memory structures\n");
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DOSMEM_Init(TRUE);
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/* allocate 1MB+64K shared memory */
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tmpnam(mm_name);
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/* strcpy(mm_name,"/tmp/mydosimage"); */
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mm_fd = open(mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
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if (mm_fd < 0) ERR("file %s could not be opened\n",mm_name);
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/* fill the file with the DOS memory */
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if (write( mm_fd, NULL, 0x110000 ) != 0x110000) ERR("cannot write DOS mem\n");
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/* map it in */
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img_base = mmap(NULL,0x110000,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED|MAP_FIXED,mm_fd,0);
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close( mm_fd );
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if (img_base)
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{
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ERR("could not map shared memory, error=%s\n",strerror(errno));
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return FALSE;
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}
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MZ_InitHandlers();
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return TRUE;
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}
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static BOOL MZ_DoLoadImage( HANDLE hFile, LPCSTR filename, OverlayBlock *oblk )
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{
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LPDOSTASK lpDosTask = dos_current;
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IMAGE_DOS_HEADER mz_header;
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DWORD image_start,image_size,min_size,max_size,avail;
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BYTE*psp_start,*load_start,*oldenv;
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int x, old_com=0, alloc;
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SEGPTR reloc;
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WORD env_seg, load_seg, rel_seg, oldpsp_seg;
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DWORD len;
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if (lpDosTask) {
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/* DOS process already running, inherit from it */
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PDB16* par_psp = (PDB16*)((DWORD)lpDosTask->psp_seg << 4);
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alloc=0;
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oldenv = (LPBYTE)((DWORD)par_psp->environment << 4);
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oldpsp_seg = lpDosTask->psp_seg;
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} else {
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/* allocate new DOS process, inheriting from Wine environment */
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alloc=1;
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lpDosTask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DOSTASK));
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dos_current = lpDosTask;
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oldenv = GetEnvironmentStringsA();
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oldpsp_seg = 0;
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}
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SetFilePointer(hFile,0,NULL,FILE_BEGIN);
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if ( !ReadFile(hFile,&mz_header,sizeof(mz_header),&len,NULL)
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|| len != sizeof(mz_header)
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|| mz_header.e_magic != IMAGE_DOS_SIGNATURE) {
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char *p = strrchr( filename, '.' );
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if (!p || strcasecmp( p, ".com" )) /* check for .COM extension */
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{
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SetLastError(ERROR_BAD_FORMAT);
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goto load_error;
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}
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old_com=1; /* assume .COM file */
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image_start=0;
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image_size=GetFileSize(hFile,NULL);
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min_size=0x10000; max_size=0x100000;
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mz_header.e_crlc=0;
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mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
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mz_header.e_cs=0; mz_header.e_ip=0x100;
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} else {
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/* calculate load size */
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image_start=mz_header.e_cparhdr<<4;
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image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
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if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
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image_size-=image_start;
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min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
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max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
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}
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if (alloc) MZ_InitMemory();
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if (oblk) {
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/* load overlay into preallocated memory */
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load_seg=oblk->load_seg;
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rel_seg=oblk->rel_seg;
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load_start=(LPBYTE)((DWORD)load_seg<<4);
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} else {
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/* allocate environment block */
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env_seg=MZ_InitEnvironment(oldenv, filename);
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/* allocate memory for the executable */
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TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
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avail=DOSMEM_Available();
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if (avail<min_size) {
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ERR("insufficient DOS memory\n");
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SetLastError(ERROR_NOT_ENOUGH_MEMORY);
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goto load_error;
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}
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if (avail>max_size) avail=max_size;
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psp_start=DOSMEM_GetBlock(avail,&lpDosTask->psp_seg);
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if (!psp_start) {
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ERR("error allocating DOS memory\n");
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SetLastError(ERROR_NOT_ENOUGH_MEMORY);
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goto load_error;
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}
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load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
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rel_seg=load_seg;
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load_start=psp_start+(PSP_SIZE<<4);
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MZ_CreatePSP(psp_start, env_seg, oldpsp_seg);
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}
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/* load executable image */
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TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
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SetFilePointer(hFile,image_start,NULL,FILE_BEGIN);
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if (!ReadFile(hFile,load_start,image_size,&len,NULL) || len != image_size) {
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SetLastError(ERROR_BAD_FORMAT);
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goto load_error;
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}
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if (mz_header.e_crlc) {
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/* load relocation table */
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TRACE("loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
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/* FIXME: is this too slow without read buffering? */
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SetFilePointer(hFile,mz_header.e_lfarlc,NULL,FILE_BEGIN);
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for (x=0; x<mz_header.e_crlc; x++) {
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if (!ReadFile(hFile,&reloc,sizeof(reloc),&len,NULL) || len != sizeof(reloc)) {
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SetLastError(ERROR_BAD_FORMAT);
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goto load_error;
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}
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*(WORD*)SEGPTR16(load_start,reloc)+=rel_seg;
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}
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}
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if (!oblk) {
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init_cs = load_seg+mz_header.e_cs;
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init_ip = mz_header.e_ip;
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init_ss = load_seg+mz_header.e_ss;
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init_sp = mz_header.e_sp;
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TRACE("entry point: %04x:%04x\n",init_cs,init_ip);
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}
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if (alloc && !MZ_InitTask()) {
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MZ_KillTask();
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SetLastError(ERROR_GEN_FAILURE);
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return FALSE;
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}
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return TRUE;
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load_error:
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lpDosTask->psp_seg = oldpsp_seg;
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if (alloc) {
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dos_current = NULL;
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if (mm_name[0]!=0) unlink(mm_name);
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}
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return FALSE;
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}
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/***********************************************************************
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* LoadDosExe (WINEDOS.@)
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*/
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void WINAPI MZ_LoadImage( LPCSTR filename, HANDLE hFile )
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{
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if (MZ_DoLoadImage( hFile, filename, NULL )) MZ_Launch();
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}
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/***********************************************************************
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* Exec (WINEDOS.@)
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*/
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BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
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{
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/* this may only be called from existing DOS processes
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* (i.e. one DOS app spawning another) */
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/* FIXME: do we want to check binary type first, to check
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* whether it's a NE/PE executable? */
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LPDOSTASK lpDosTask = MZ_Current();
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HFILE hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
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NULL, OPEN_EXISTING, 0, 0);
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BOOL ret = FALSE;
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if (hFile == INVALID_HANDLE_VALUE) return FALSE;
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switch (func) {
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case 0: /* load and execute */
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case 1: /* load but don't execute */
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{
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/* save current process's return SS:SP now */
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LPBYTE psp_start = (LPBYTE)((DWORD)lpDosTask->psp_seg << 4);
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PDB16 *psp = (PDB16 *)psp_start;
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psp->saveStack = (DWORD)MAKESEGPTR(context->SegSs, LOWORD(context->Esp));
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}
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ret = MZ_DoLoadImage( hFile, filename, NULL );
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if (ret) {
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/* MZ_LoadImage created a new PSP and loaded new values into lpDosTask,
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* let's work on the new values now */
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LPBYTE psp_start = (LPBYTE)((DWORD)lpDosTask->psp_seg << 4);
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ExecBlock *blk = (ExecBlock *)paramblk;
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MZ_FillPSP(psp_start, DOSMEM_MapRealToLinear(blk->cmdline));
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/* the lame MS-DOS engineers decided that the return address should be in int22 */
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INT_SetRMHandler(0x22, (FARPROC16)MAKESEGPTR(context->SegCs, LOWORD(context->Eip)));
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if (func) {
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/* don't execute, just return startup state */
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blk->init_cs = init_cs;
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blk->init_ip = init_ip;
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blk->init_ss = init_ss;
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blk->init_sp = init_sp;
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} else {
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/* execute by making us return to new process */
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context->SegCs = init_cs;
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context->Eip = init_ip;
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context->SegSs = init_ss;
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context->Esp = init_sp;
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context->SegDs = lpDosTask->psp_seg;
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context->SegEs = lpDosTask->psp_seg;
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context->Eax = 0;
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}
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}
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break;
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case 3: /* load overlay */
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{
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OverlayBlock *blk = (OverlayBlock *)paramblk;
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ret = MZ_DoLoadImage( hFile, filename, blk );
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}
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break;
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default:
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FIXME("EXEC load type %d not implemented\n", func);
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SetLastError(ERROR_INVALID_FUNCTION);
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break;
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}
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CloseHandle(hFile);
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return ret;
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}
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/***********************************************************************
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* LoadDPMI (WINEDOS.@)
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*/
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LPDOSTASK WINAPI MZ_AllocDPMITask( void )
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{
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LPDOSTASK lpDosTask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DOSTASK));
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if (lpDosTask) {
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dos_current = lpDosTask;
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MZ_InitMemory();
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MZ_InitTask();
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}
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return lpDosTask;
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}
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void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
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{
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proc(arg);
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}
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static void MZ_InitTimer( int ver )
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{
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if (ver<1) {
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/* can't make timer ticks */
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} else {
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int func;
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struct timeval tim;
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/* start dosmod timer at 55ms (18.2Hz) */
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func=DOSMOD_SET_TIMER;
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tim.tv_sec=0; tim.tv_usec=54925;
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write(write_pipe,&func,sizeof(func));
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write(write_pipe,&tim,sizeof(tim));
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}
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}
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static BOOL MZ_InitTask(void)
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{
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int write_fd[2],x_fd;
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pid_t child;
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char path[256],*fpath;
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/* create pipes */
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if (!CreatePipe(&hReadPipe,&hWritePipe,NULL,0)) return FALSE;
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if (pipe(write_fd)<0) {
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CloseHandle(hReadPipe);
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CloseHandle(hWritePipe);
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return FALSE;
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}
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read_pipe = FILE_GetUnixHandle( hReadPipe, GENERIC_READ );
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x_fd = FILE_GetUnixHandle( hWritePipe, GENERIC_WRITE );
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TRACE("win32 pipe: read=%d, write=%d, unix pipe: read=%d, write=%d\n",
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hReadPipe,hWritePipe,read_pipe,x_fd);
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TRACE("outbound unix pipe: read=%d, write=%d, pid=%d\n",write_fd[0],write_fd[1],getpid());
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write_pipe=write_fd[1];
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TRACE("Loading DOS VM support module\n");
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if ((child=fork())<0) {
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close(write_fd[0]);
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close(read_pipe);
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close(write_pipe);
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close(x_fd);
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CloseHandle(hReadPipe);
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CloseHandle(hWritePipe);
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return FALSE;
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}
|
|
if (child!=0) {
|
|
/* parent process */
|
|
int ret;
|
|
|
|
close(write_fd[0]);
|
|
close(x_fd);
|
|
dosmod_pid = child;
|
|
/* wait for child process to signal readiness */
|
|
while (1) {
|
|
if (read(read_pipe,&ret,sizeof(ret))==sizeof(ret)) break;
|
|
if ((errno==EINTR)||(errno==EAGAIN)) continue;
|
|
/* failure */
|
|
ERR("dosmod has failed to initialize\n");
|
|
if (mm_name[0]!=0) unlink(mm_name);
|
|
return FALSE;
|
|
}
|
|
/* the child has now mmaped the temp file, it's now safe to unlink.
|
|
* do it here to avoid leaving a mess in /tmp if/when Wine crashes... */
|
|
if (mm_name[0]!=0) unlink(mm_name);
|
|
/* start simulated system timer */
|
|
MZ_InitTimer(ret);
|
|
if (ret<2) {
|
|
ERR("dosmod version too old! Please install newer dosmod properly\n");
|
|
ERR("If you don't, the new dosmod event handling system will not work\n");
|
|
}
|
|
/* all systems are now go */
|
|
} else {
|
|
/* child process */
|
|
close(read_pipe);
|
|
close(write_pipe);
|
|
/* put our pipes somewhere dosmod can find them */
|
|
dup2(write_fd[0],0); /* stdin */
|
|
dup2(x_fd,1); /* stdout */
|
|
/* now load dosmod */
|
|
/* check argv[0]-derived paths first, since the newest dosmod is most likely there
|
|
* (at least it was once for Andreas Mohr, so I decided to make it easier for him) */
|
|
fpath=strrchr(strcpy(path,full_argv0),'/');
|
|
if (fpath) {
|
|
strcpy(fpath,"/dosmod");
|
|
execl(path,mm_name,NULL);
|
|
strcpy(fpath,"/loader/dos/dosmod");
|
|
execl(path,mm_name,NULL);
|
|
}
|
|
/* okay, it wasn't there, try in the path */
|
|
execlp("dosmod",mm_name,NULL);
|
|
/* last desperate attempts: current directory */
|
|
execl("dosmod",mm_name,NULL);
|
|
/* and, just for completeness... */
|
|
execl("loader/dos/dosmod",mm_name,NULL);
|
|
/* if failure, exit */
|
|
ERR("Failed to spawn dosmod, error=%s\n",strerror(errno));
|
|
exit(1);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static void MZ_Launch(void)
|
|
{
|
|
LPDOSTASK lpDosTask = MZ_Current();
|
|
CONTEXT context;
|
|
TDB *pTask = TASK_GetCurrent();
|
|
BYTE *psp_start = PTR_REAL_TO_LIN( lpDosTask->psp_seg, 0 );
|
|
|
|
MZ_FillPSP(psp_start, GetCommandLineA());
|
|
pTask->flags |= TDBF_WINOLDAP;
|
|
|
|
memset( &context, 0, sizeof(context) );
|
|
context.SegCs = init_cs;
|
|
context.Eip = init_ip;
|
|
context.SegSs = init_ss;
|
|
context.Esp = init_sp;
|
|
context.SegDs = lpDosTask->psp_seg;
|
|
context.SegEs = lpDosTask->psp_seg;
|
|
context.EFlags = 0x00080000; /* virtual interrupt flag */
|
|
_LeaveWin16Lock();
|
|
DOSVM_Enter( &context );
|
|
}
|
|
|
|
static void MZ_KillTask(void)
|
|
{
|
|
TRACE("killing DOS task\n");
|
|
VGA_Clean();
|
|
kill(dosmod_pid,SIGTERM);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Exit (WINEDOS.@)
|
|
*/
|
|
void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
|
|
{
|
|
LPDOSTASK lpDosTask = MZ_Current();
|
|
if (lpDosTask) {
|
|
WORD psp_seg = cs_psp ? context->SegCs : lpDosTask->psp_seg;
|
|
LPBYTE psp_start = (LPBYTE)((DWORD)psp_seg << 4);
|
|
PDB16 *psp = (PDB16 *)psp_start;
|
|
WORD parpsp = psp->parentPSP; /* check for parent DOS process */
|
|
if (parpsp) {
|
|
/* retrieve parent's return address */
|
|
FARPROC16 retaddr = INT_GetRMHandler(0x22);
|
|
/* restore interrupts */
|
|
INT_SetRMHandler(0x22, psp->savedint22);
|
|
INT_SetRMHandler(0x23, psp->savedint23);
|
|
INT_SetRMHandler(0x24, psp->savedint24);
|
|
/* FIXME: deallocate file handles etc */
|
|
/* free process's associated memory
|
|
* FIXME: walk memory and deallocate all blocks owned by process */
|
|
DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(MAKELONG(0,psp->environment)));
|
|
DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(MAKELONG(0,lpDosTask->psp_seg)));
|
|
/* switch to parent's PSP */
|
|
lpDosTask->psp_seg = parpsp;
|
|
psp_start = (LPBYTE)((DWORD)parpsp << 4);
|
|
psp = (PDB16 *)psp_start;
|
|
/* now return to parent */
|
|
lpDosTask->retval = retval;
|
|
context->SegCs = SELECTOROF(retaddr);
|
|
context->Eip = OFFSETOF(retaddr);
|
|
context->SegSs = SELECTOROF(psp->saveStack);
|
|
context->Esp = OFFSETOF(psp->saveStack);
|
|
return;
|
|
} else
|
|
MZ_KillTask();
|
|
}
|
|
ExitThread( retval );
|
|
}
|
|
|
|
#else /* !MZ_SUPPORTED */
|
|
|
|
/***********************************************************************
|
|
* LoadDosExe (WINEDOS.@)
|
|
*/
|
|
void WINAPI MZ_LoadImage( LPCSTR filename, HANDLE hFile )
|
|
{
|
|
WARN("DOS executables not supported on this platform\n");
|
|
SetLastError(ERROR_BAD_FORMAT);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Exec (WINEDOS.@)
|
|
*/
|
|
BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
|
|
{
|
|
/* can't happen */
|
|
SetLastError(ERROR_BAD_FORMAT);
|
|
return FALSE;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* LoadDPMI (WINEDOS.@)
|
|
*/
|
|
LPDOSTASK WINAPI MZ_AllocDPMITask( void )
|
|
{
|
|
ERR("Actual real-mode calls not supported on this platform!\n");
|
|
return NULL;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Exit (WINEDOS.@)
|
|
*/
|
|
void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
|
|
{
|
|
ExitThread( retval );
|
|
}
|
|
|
|
#endif /* !MZ_SUPPORTED */
|
|
|
|
/***********************************************************************
|
|
* GetCurrent (WINEDOS.@)
|
|
*/
|
|
LPDOSTASK WINAPI MZ_Current( void )
|
|
{
|
|
return dos_current;
|
|
}
|