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Sweden-Number/loader/dos/module.c

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/*
* DOS (MZ) loader
*
* Copyright 1998 Ove Kåven
*
* This code hasn't been completely cleaned up yet.
*/
#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>
#include <sys/time.h>
#include "windef.h"
#include "wine/winbase16.h"
#include "winerror.h"
#include "module.h"
#include "peexe.h"
#include "neexe.h"
#include "task.h"
#include "selectors.h"
#include "file.h"
#include "ldt.h"
#include "process.h"
#include "miscemu.h"
#include "debugtools.h"
#include "dosexe.h"
#include "dosmod.h"
#include "options.h"
#include "server.h"
DEFAULT_DEBUG_CHANNEL(module)
#ifdef MZ_SUPPORTED
#include <sys/mman.h>
/* define this to try mapping through /proc/pid/mem instead of a temp file,
but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
#undef MZ_MAPSELF
#define BIOS_DATA_SEGMENT 0x40
#define START_OFFSET 0
#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)))
static void MZ_InitPSP( LPVOID lpPSP, LPCSTR cmdline, WORD env )
{
PDB16*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;
psp->environment=env;
/* copy parameters */
if (cmd) {
#if 0
/* command.com doesn't do this */
while (*cmd == ' ') cmd++;
#endif
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) */
}
/* default INT 08 handler: increases timer tick counter but not much more */
static char int08[]={
0xCD,0x1C, /* int $0x1c */
0x50, /* pushw %ax */
0x1E, /* pushw %ds */
0xB8,0x40,0x00, /* movw $0x40,%ax */
0x8E,0xD8, /* movw %ax,%ds */
#if 0
0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
#else
0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
#endif
0xB0,0x20, /* movb $0x20,%al */
0xE6,0x20, /* outb %al,$0x20 */
0x1F, /* popw %ax */
0x58, /* popw %ax */
0xCF /* iret */
};
static void MZ_InitHandlers( LPDOSTASK lpDosTask )
{
WORD seg;
LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(int08),&seg);
memcpy(start,int08,sizeof(int08));
/* INT 08: point it at our tick-incrementing handler */
((SEGPTR*)(lpDosTask->img))[0x08]=PTR_SEG_OFF_TO_SEGPTR(seg,0);
/* INT 1C: just point it to IRET, we don't want to handle it ourselves */
((SEGPTR*)(lpDosTask->img))[0x1C]=PTR_SEG_OFF_TO_SEGPTR(seg,sizeof(int08)-1);
}
static char enter_xms[]={
/* XMS hookable entry point */
0xEB,0x03, /* jmp entry */
0x90,0x90,0x90, /* nop;nop;nop */
/* entry: */
/* real entry point */
/* for simplicity, we'll just use the same hook as DPMI below */
0xCD,0x31, /* int $0x31 */
0xCB /* lret */
};
static void MZ_InitXMS( LPDOSTASK lpDosTask )
{
LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_xms),&(lpDosTask->xms_seg));
memcpy(start,enter_xms,sizeof(enter_xms));
}
static char enter_pm[]={
0x50, /* pushw %ax */
0x52, /* pushw %dx */
0x55, /* pushw %bp */
0x89,0xE5, /* movw %sp,%bp */
/* get return CS */
0x8B,0x56,0x08, /* movw 8(%bp),%dx */
/* just call int 31 here to get into protected mode... */
/* it'll check whether it was called from dpmi_seg... */
0xCD,0x31, /* int $0x31 */
/* we are now in the context of a 16-bit relay call */
/* need to fixup our stack;
* 16-bit relay return address will be lost, but we won't worry quite yet */
0x8E,0xD0, /* movw %ax,%ss */
0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
/* set return CS */
0x89,0x56,0x08, /* movw %dx,8(%bp) */
0x5D, /* popw %bp */
0x5A, /* popw %dx */
0x58, /* popw %ax */
0xCB /* lret */
};
static void MZ_InitDPMI( LPDOSTASK lpDosTask )
{
unsigned size=sizeof(enter_pm);
LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,size,&(lpDosTask->dpmi_seg));
lpDosTask->dpmi_sel = SELECTOR_AllocBlock( start, size, SEGMENT_CODE, FALSE, FALSE );
memcpy(start,enter_pm,sizeof(enter_pm));
}
static WORD MZ_InitEnvironment( LPDOSTASK lpDosTask, LPCSTR env, LPCSTR name )
{
unsigned sz=0;
WORD seg;
LPSTR envblk;
if (env) {
/* get size of environment block */
while (env[sz++]) sz+=strlen(env+sz)+1;
} else sz++;
/* allocate it */
envblk=DOSMEM_GetBlock(lpDosTask->hModule,sz+sizeof(WORD)+strlen(name)+1,&seg);
/* fill it */
if (env) {
memcpy(envblk,env,sz);
} else envblk[0]=0;
/* DOS 3.x: the block contains 1 additional string */
*(WORD*)(envblk+sz)=1;
/* being the program name itself */
strcpy(envblk+sz+sizeof(WORD),name);
return seg;
}
static BOOL MZ_InitMemory( LPDOSTASK lpDosTask, NE_MODULE *pModule )
{
int x;
if (lpDosTask->img) return TRUE; /* already allocated */
/* allocate 1MB+64K shared memory */
lpDosTask->img_ofs=START_OFFSET;
#ifdef MZ_MAPSELF
lpDosTask->img=VirtualAlloc(NULL,0x110000,MEM_COMMIT,PAGE_READWRITE);
/* make sure mmap accepts it */
((char*)lpDosTask->img)[0x10FFFF]=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("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("could not map shared memory, error=%s\n",strerror(errno));
return FALSE;
}
TRACE("DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img);
pModule->dos_image=lpDosTask->img;
/* initialize the memory */
TRACE("Initializing DOS memory structures\n");
DOSMEM_Init(lpDosTask->hModule);
MZ_InitHandlers(lpDosTask);
MZ_InitXMS(lpDosTask);
MZ_InitDPMI(lpDosTask);
return TRUE;
}
static BOOL MZ_LoadImage( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline,
LPCSTR env, LPDOSTASK lpDosTask, NE_MODULE *pModule )
{
IMAGE_DOS_HEADER mz_header;
DWORD image_start,image_size,min_size,max_size,avail;
BYTE*psp_start,*load_start;
int x,old_com=0;
SEGPTR reloc;
WORD env_seg;
_llseek(hFile,0,FILE_BEGIN);
if ((_lread(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) ||
(mz_header.e_magic != IMAGE_DOS_SIGNATURE)) {
old_com=1; /* assume .COM file */
image_start=0;
image_size=GetFileSize(hFile,NULL);
min_size=0x10000; max_size=0x100000;
mz_header.e_crlc=0;
mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
mz_header.e_cs=0; mz_header.e_ip=0x100;
} else {
/* 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);
}
MZ_InitMemory(lpDosTask,pModule);
/* allocate environment block */
env_seg=MZ_InitEnvironment(lpDosTask,env,ofs->szPathName);
/* allocate memory for the executable */
TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
avail=DOSMEM_Available(lpDosTask->hModule);
if (avail<min_size) {
ERR("insufficient DOS memory\n");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
if (avail>max_size) avail=max_size;
psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&lpDosTask->psp_seg);
if (!psp_start) {
ERR("error allocating DOS memory\n");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
lpDosTask->load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
load_start=psp_start+(PSP_SIZE<<4);
MZ_InitPSP(psp_start, cmdline, env_seg);
/* load executable image */
TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
_llseek(hFile,image_start,FILE_BEGIN);
if ((_lread(hFile,load_start,image_size)) != image_size) {
SetLastError(ERROR_BAD_FORMAT);
return FALSE;
}
if (mz_header.e_crlc) {
/* load relocation table */
TRACE("loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
/* FIXME: is this too slow without read buffering? */
_llseek(hFile,mz_header.e_lfarlc,FILE_BEGIN);
for (x=0; x<mz_header.e_crlc; x++) {
if (_lread(hFile,&reloc,sizeof(reloc)) != sizeof(reloc)) {
SetLastError(ERROR_BAD_FORMAT);
return FALSE;
}
*(WORD*)SEGPTR16(load_start,reloc)+=lpDosTask->load_seg;
}
}
lpDosTask->init_cs=lpDosTask->load_seg+mz_header.e_cs;
lpDosTask->init_ip=mz_header.e_ip;
lpDosTask->init_ss=lpDosTask->load_seg+mz_header.e_ss;
lpDosTask->init_sp=mz_header.e_sp;
TRACE("entry point: %04x:%04x\n",lpDosTask->init_cs,lpDosTask->init_ip);
return TRUE;
}
LPDOSTASK MZ_AllocDPMITask( HMODULE16 hModule )
{
LPDOSTASK lpDosTask = calloc(1, sizeof(DOSTASK));
NE_MODULE *pModule;
if (lpDosTask) {
lpDosTask->hModule = hModule;
pModule = (NE_MODULE *)GlobalLock16(hModule);
pModule->lpDosTask = lpDosTask;
lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
MZ_InitMemory(lpDosTask, pModule);
GlobalUnlock16(hModule);
}
return lpDosTask;
}
static void MZ_InitTimer( LPDOSTASK lpDosTask, int ver )
{
if (ver<1) {
/* can't make timer ticks */
} else {
int func;
struct timeval tim;
/* start dosmod timer at 55ms (18.2Hz) */
func=DOSMOD_SET_TIMER;
tim.tv_sec=0; tim.tv_usec=54925;
write(lpDosTask->write_pipe,&func,sizeof(func));
write(lpDosTask->write_pipe,&tim,sizeof(tim));
}
}
BOOL MZ_InitTask( LPDOSTASK lpDosTask )
{
int write_fd[2],x_fd;
pid_t child;
char *fname,*farg,arg[16],fproc[64],path[256],*fpath;
SECURITY_ATTRIBUTES attr={sizeof(attr),NULL,TRUE};
struct get_read_fd_request r_req;
struct get_write_fd_request w_req;
if (!lpDosTask) return FALSE;
/* create pipes */
/* this happens in the wrong process context, so we have to let the new process
inherit it... (FIXME: call MZ_InitTask in the right process context) */
if (!CreatePipe(&(lpDosTask->hReadPipe),&(lpDosTask->hXPipe),&attr,0)) return FALSE;
if (pipe(write_fd)<0) {
CloseHandle(lpDosTask->hReadPipe);
CloseHandle(lpDosTask->hXPipe);
return FALSE;
}
r_req.handle = lpDosTask->hReadPipe;
CLIENT_SendRequest( REQ_GET_READ_FD, -1, 1, &r_req, sizeof(r_req) );
CLIENT_WaitReply( NULL, &(lpDosTask->read_pipe), 0 );
w_req.handle = lpDosTask->hXPipe;
CLIENT_SendRequest( REQ_GET_WRITE_FD, -1, 1, &w_req, sizeof(w_req) );
CLIENT_WaitReply( NULL, &x_fd, 0 );
TRACE("win32 pipe: read=%d, write=%d, unix pipe: read=%d, write=%d\n",
lpDosTask->hReadPipe,lpDosTask->hXPipe,lpDosTask->read_pipe,x_fd);
TRACE("outbound unix pipe: read=%d, write=%d, pid=%d\n",write_fd[0],write_fd[1],getpid());
lpDosTask->write_pipe=write_fd[1];
lpDosTask->hConInput=GetStdHandle(STD_INPUT_HANDLE);
lpDosTask->hConOutput=GetStdHandle(STD_OUTPUT_HANDLE);
/* if we have a mapping file, use it */
fname=lpDosTask->mm_name; farg=NULL;
if (!fname[0]) {
/* otherwise, map our own memory image */
sprintf(fproc,"/proc/%d/mem",getpid());
sprintf(arg,"%ld",(unsigned long)lpDosTask->img);
fname=fproc; farg=arg;
}
TRACE("Loading DOS VM support module (hmodule=%04x)\n",lpDosTask->hModule);
if ((child=fork())<0) {
close(write_fd[0]);
close(lpDosTask->read_pipe);
close(lpDosTask->write_pipe);
close(x_fd);
CloseHandle(lpDosTask->hReadPipe);
CloseHandle(lpDosTask->hXPipe);
return FALSE;
}
if (child!=0) {
/* parent process */
int ret;
close(write_fd[0]);
close(x_fd);
lpDosTask->task=child;
/* wait for child process to signal readiness */
while (1) {
if (read(lpDosTask->read_pipe,&ret,sizeof(ret))==sizeof(ret)) break;
if ((errno==EINTR)||(errno==EAGAIN)) continue;
/* failure */
ERR("dosmod has failed to initialize\n");
if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->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 (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
/* start simulated system timer */
MZ_InitTimer(lpDosTask,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(lpDosTask->read_pipe);
close(lpDosTask->write_pipe);
/* put our pipes somewhere dosmod can find them */
dup2(write_fd[0],0); /* stdin */
dup2(x_fd,1); /* stdout */
/* enable signals */
SIGNAL_MaskAsyncEvents(FALSE);
/* 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,Options.argv0),'/');
if (fpath) {
strcpy(fpath,"/dosmod");
execl(path,fname,farg,NULL);
strcpy(fpath,"/loader/dos/dosmod");
execl(path,fname,farg,NULL);
}
/* okay, it wasn't there, try in the path */
execlp("dosmod",fname,farg,NULL);
/* last desperate attempts: current directory */
execl("dosmod",fname,farg,NULL);
/* and, just for completeness... */
execl("loader/dos/dosmod",fname,farg,NULL);
/* if failure, exit */
ERR("Failed to spawn dosmod, error=%s\n",strerror(errno));
exit(1);
}
return TRUE;
}
BOOL MZ_CreateProcess( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline, LPCSTR env,
LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
BOOL inherit, DWORD flags, LPSTARTUPINFOA startup,
LPPROCESS_INFORMATION info )
{
LPDOSTASK lpDosTask = NULL; /* keep gcc from complaining */
HMODULE16 hModule;
PDB *pdb = PROCESS_Current();
TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
int alloc = !(pModule && pModule->dos_image);
if (alloc && (lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
if ((!env)&&pdb) env = pdb->env_db->environ;
if (alloc) {
if ((hModule = MODULE_CreateDummyModule(ofs, NULL)) < 32) {
SetLastError(hModule);
return FALSE;
}
lpDosTask->hModule = hModule;
pModule = (NE_MODULE *)GlobalLock16(hModule);
pModule->lpDosTask = lpDosTask;
lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
} else lpDosTask=pModule->lpDosTask;
if (!MZ_LoadImage( hFile, ofs, cmdline, env, lpDosTask, pModule )) {
if (alloc) {
if (lpDosTask->mm_name[0]!=0) {
if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET);
if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd);
unlink(lpDosTask->mm_name);
} else
if (lpDosTask->img!=NULL) VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
}
return FALSE;
}
if (alloc) {
pModule->dos_image = lpDosTask->img;
if (!MZ_InitTask( lpDosTask )) {
MZ_KillModule( lpDosTask );
/* FIXME: cleanup hModule */
SetLastError(ERROR_GEN_FAILURE);
return FALSE;
}
inherit = TRUE; /* bad hack for inheriting the CreatePipe... */
if (!PROCESS_Create( pModule, cmdline, env, 0, 0,
psa, tsa, inherit, flags, startup, info ))
return FALSE;
}
return TRUE;
}
void MZ_KillModule( LPDOSTASK lpDosTask )
{
DOSEVENT *event,*p_event;
DOSSYSTEM *sys,*p_sys;
TRACE("killing DOS task\n");
if (lpDosTask->mm_name[0]!=0) {
munmap(lpDosTask->img,0x110000-START_OFFSET);
close(lpDosTask->mm_fd);
} else VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
close(lpDosTask->read_pipe);
close(lpDosTask->write_pipe);
CloseHandle(lpDosTask->hReadPipe);
CloseHandle(lpDosTask->hXPipe);
kill(lpDosTask->task,SIGTERM);
/* free memory allocated for events and systems */
#define DFREE(var,pvar,svar) \
var = lpDosTask->svar; \
while (var) { \
if (var->data) free(var->data); \
pvar = var->next; free(var); var = pvar; \
}
DFREE(event,p_event,pending)
DFREE(event,p_event,current)
DFREE(sys,p_sys,sys)
#undef DFREE
#if 0
/* FIXME: this seems to crash */
if (lpDosTask->dpmi_sel)
SELECTOR_FreeBlock(lpDosTask->dpmi_sel, 1);
#endif
}
LPDOSTASK MZ_Current( void )
{
TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
GlobalUnlock16( GetCurrentTask() );
if (pModule)
return pModule->lpDosTask;
return NULL;
}
#else /* !MZ_SUPPORTED */
BOOL MZ_CreateProcess( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline, LPCSTR env,
LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
BOOL inherit, DWORD flags, LPSTARTUPINFOA startup,
LPPROCESS_INFORMATION info )
{
WARN("DOS executables not supported on this architecture\n");
SetLastError(ERROR_BAD_FORMAT);
return FALSE;
}
LPDOSTASK MZ_Current( void )
{
return NULL;
}
#endif
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