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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 "config.h"
#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 "task.h"
#include "selectors.h"
#include "file.h"
#include "ldt.h"
#include "miscemu.h"
#include "debugtools.h"
#include "dosexe.h"
#include "dosmod.h"
#include "options.h"
#include "vga.h"
DEFAULT_DEBUG_CHANNEL(module);
static LPDOSTASK dos_current;
#ifdef MZ_SUPPORTED
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
/* 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 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)))
/* structures for EXEC */
typedef struct {
WORD env_seg;
DWORD cmdline WINE_PACKED;
DWORD fcb1 WINE_PACKED;
DWORD fcb2 WINE_PACKED;
WORD init_sp;
WORD init_ss;
WORD init_ip;
WORD init_cs;
} ExecBlock;
typedef struct {
WORD load_seg;
WORD rel_seg;
} OverlayBlock;
/* global variables */
static WORD init_cs,init_ip,init_ss,init_sp;
static char mm_name[128];
int read_pipe, write_pipe;
HANDLE hReadPipe, hWritePipe;
pid_t dosmod_pid;
static void MZ_Launch(void);
static BOOL MZ_InitTask(void);
static void MZ_KillTask(void);
static void MZ_CreatePSP( LPVOID lpPSP, WORD env, WORD par )
{
PDB16*psp=lpPSP;
psp->int20=0x20CD; /* int 20 */
/* some programs use this to calculate how much memory they need */
psp->nextParagraph=0x9FFF; /* FIXME: use a real value */
/* FIXME: dispatcher */
psp->savedint22 = INT_GetRMHandler(0x22);
psp->savedint23 = INT_GetRMHandler(0x23);
psp->savedint24 = INT_GetRMHandler(0x24);
psp->parentPSP=par;
psp->environment=env;
/* FIXME: more PSP stuff */
}
static void MZ_FillPSP( LPVOID lpPSP, LPCSTR cmdline )
{
PDB16*psp=lpPSP;
const char*cmd=cmdline?strchr(cmdline,' '):NULL;
/* 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: more PSP stuff */
}
/* 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(void)
{
WORD seg;
LPBYTE start=DOSMEM_GetBlock(sizeof(int08),&seg);
memcpy(start,int08,sizeof(int08));
/* INT 08: point it at our tick-incrementing handler */
((SEGPTR*)0)[0x08]=PTR_SEG_OFF_TO_SEGPTR(seg,0);
/* INT 1C: just point it to IRET, we don't want to handle it ourselves */
((SEGPTR*)0)[0x1C]=PTR_SEG_OFF_TO_SEGPTR(seg,sizeof(int08)-1);
}
static WORD MZ_InitEnvironment( 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(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(void)
{
int mm_fd;
void *img_base;
/* initialize the memory */
TRACE("Initializing DOS memory structures\n");
DOSMEM_Init(TRUE);
/* allocate 1MB+64K shared memory */
tmpnam(mm_name);
/* strcpy(mm_name,"/tmp/mydosimage"); */
mm_fd = open(mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
if (mm_fd < 0) ERR("file %s could not be opened\n",mm_name);
/* fill the file with the DOS memory */
if (write( mm_fd, NULL, 0x110000 ) != 0x110000) ERR("cannot write DOS mem\n");
/* map it in */
img_base = mmap(NULL,0x110000,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED|MAP_FIXED,mm_fd,0);
close( mm_fd );
if (img_base)
{
ERR("could not map shared memory, error=%s\n",strerror(errno));
return FALSE;
}
MZ_InitHandlers();
return TRUE;
}
BOOL MZ_DoLoadImage( HANDLE hFile, LPCSTR filename, OverlayBlock *oblk )
{
LPDOSTASK lpDosTask = dos_current;
IMAGE_DOS_HEADER mz_header;
DWORD image_start,image_size,min_size,max_size,avail;
BYTE*psp_start,*load_start,*oldenv;
int x, old_com=0, alloc;
SEGPTR reloc;
WORD env_seg, load_seg, rel_seg, oldpsp_seg;
DWORD len;
if (lpDosTask) {
/* DOS process already running, inherit from it */
PDB16* par_psp = (PDB16*)((DWORD)lpDosTask->psp_seg << 4);
alloc=0;
oldenv = (LPBYTE)((DWORD)par_psp->environment << 4);
oldpsp_seg = lpDosTask->psp_seg;
} else {
/* allocate new DOS process, inheriting from Wine environment */
alloc=1;
lpDosTask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DOSTASK));
dos_current = lpDosTask;
oldenv = GetEnvironmentStringsA();
oldpsp_seg = 0;
}
SetFilePointer(hFile,0,NULL,FILE_BEGIN);
if ( !ReadFile(hFile,&mz_header,sizeof(mz_header),&len,NULL)
|| len != sizeof(mz_header)
|| mz_header.e_magic != IMAGE_DOS_SIGNATURE) {
char *p = strrchr( filename, '.' );
if (!p || strcasecmp( p, ".com" )) /* check for .COM extension */
{
SetLastError(ERROR_BAD_FORMAT);
goto load_error;
}
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);
}
if (alloc) MZ_InitMemory();
if (oblk) {
/* load overlay into preallocated memory */
load_seg=oblk->load_seg;
rel_seg=oblk->rel_seg;
load_start=(LPBYTE)((DWORD)load_seg<<4);
} else {
/* allocate environment block */
env_seg=MZ_InitEnvironment(oldenv, filename);
/* allocate memory for the executable */
TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
avail=DOSMEM_Available();
if (avail<min_size) {
ERR("insufficient DOS memory\n");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
goto load_error;
}
if (avail>max_size) avail=max_size;
psp_start=DOSMEM_GetBlock(avail,&lpDosTask->psp_seg);
if (!psp_start) {
ERR("error allocating DOS memory\n");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
goto load_error;
}
load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
rel_seg=load_seg;
load_start=psp_start+(PSP_SIZE<<4);
MZ_CreatePSP(psp_start, env_seg, oldpsp_seg);
}
/* load executable image */
TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
SetFilePointer(hFile,image_start,NULL,FILE_BEGIN);
if (!ReadFile(hFile,load_start,image_size,&len,NULL) || len != image_size) {
SetLastError(ERROR_BAD_FORMAT);
goto load_error;
}
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? */
SetFilePointer(hFile,mz_header.e_lfarlc,NULL,FILE_BEGIN);
for (x=0; x<mz_header.e_crlc; x++) {
if (!ReadFile(hFile,&reloc,sizeof(reloc),&len,NULL) || len != sizeof(reloc)) {
SetLastError(ERROR_BAD_FORMAT);
goto load_error;
}
*(WORD*)SEGPTR16(load_start,reloc)+=rel_seg;
}
}
if (!oblk) {
init_cs = load_seg+mz_header.e_cs;
init_ip = mz_header.e_ip;
init_ss = load_seg+mz_header.e_ss;
init_sp = mz_header.e_sp;
TRACE("entry point: %04x:%04x\n",init_cs,init_ip);
}
if (alloc && !MZ_InitTask()) {
MZ_KillTask();
SetLastError(ERROR_GEN_FAILURE);
return FALSE;
}
return TRUE;
load_error:
lpDosTask->psp_seg = oldpsp_seg;
if (alloc) {
dos_current = NULL;
if (mm_name[0]!=0) unlink(mm_name);
}
return FALSE;
}
BOOL MZ_LoadImage( LPCSTR cmdline )
{
HFILE hFile;
char *name, buffer[MAX_PATH];
LPCSTR p = strchr( cmdline, ' ' );
if (p)
{
if (!(name = HeapAlloc( GetProcessHeap(), 0, p - cmdline + 1 ))) return FALSE;
memcpy( name, cmdline, p - cmdline );
name[p - cmdline] = 0;
}
else name = (char *)cmdline;
if (!SearchPathA( NULL, name, ".exe", sizeof(buffer), buffer, NULL )) goto error;
if ((hFile = CreateFileA( buffer, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, -1 )) == INVALID_HANDLE_VALUE)
goto error;
if (!MZ_DoLoadImage( hFile, buffer, NULL ))
{
CloseHandle( hFile );
goto error;
}
MZ_Launch();
error:
if (name != cmdline) HeapFree( GetProcessHeap(), 0, name );
return FALSE;
}
BOOL MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
{
/* this may only be called from existing DOS processes
* (i.e. one DOS app spawning another) */
/* FIXME: do we want to check binary type first, to check
* whether it's a NE/PE executable? */
LPDOSTASK lpDosTask = MZ_Current();
HFILE hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, -1);
BOOL ret = FALSE;
if (hFile == INVALID_HANDLE_VALUE) return FALSE;
switch (func) {
case 0: /* load and execute */
case 1: /* load but don't execute */
{
/* save current process's return SS:SP now */
LPBYTE psp_start = (LPBYTE)((DWORD)lpDosTask->psp_seg << 4);
PDB16 *psp = (PDB16 *)psp_start;
psp->saveStack = (DWORD)PTR_SEG_OFF_TO_SEGPTR(context->SegSs, LOWORD(context->Esp));
}
ret = MZ_DoLoadImage( hFile, filename, NULL );
if (ret) {
/* MZ_LoadImage created a new PSP and loaded new values into lpDosTask,
* let's work on the new values now */
LPBYTE psp_start = (LPBYTE)((DWORD)lpDosTask->psp_seg << 4);
ExecBlock *blk = (ExecBlock *)paramblk;
MZ_FillPSP(psp_start, DOSMEM_MapRealToLinear(blk->cmdline));
/* the lame MS-DOS engineers decided that the return address should be in int22 */
INT_SetRMHandler(0x22, (FARPROC16)PTR_SEG_OFF_TO_SEGPTR(context->SegCs, LOWORD(context->Eip)));
if (func) {
/* don't execute, just return startup state */
blk->init_cs = init_cs;
blk->init_ip = init_ip;
blk->init_ss = init_ss;
blk->init_sp = init_sp;
} else {
/* execute by making us return to new process */
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->Eax = 0;
}
}
break;
case 3: /* load overlay */
{
OverlayBlock *blk = (OverlayBlock *)paramblk;
ret = MZ_DoLoadImage( hFile, filename, blk );
}
break;
default:
FIXME("EXEC load type %d not implemented\n", func);
SetLastError(ERROR_INVALID_FUNCTION);
break;
}
CloseHandle(hFile);
return ret;
}
LPDOSTASK MZ_AllocDPMITask( void )
{
LPDOSTASK lpDosTask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DOSTASK));
if (lpDosTask) {
dos_current = lpDosTask;
MZ_InitMemory();
MZ_InitTask();
}
return lpDosTask;
}
static void MZ_InitTimer( 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(write_pipe,&func,sizeof(func));
write(write_pipe,&tim,sizeof(tim));
}
}
static BOOL MZ_InitTask(void)
{
int write_fd[2],x_fd;
pid_t child;
char path[256],*fpath;
/* create pipes */
if (!CreatePipe(&hReadPipe,&hWritePipe,NULL,0)) return FALSE;
if (pipe(write_fd)<0) {
CloseHandle(hReadPipe);
CloseHandle(hWritePipe);
return FALSE;
}
read_pipe = FILE_GetUnixHandle( hReadPipe, GENERIC_READ );
x_fd = FILE_GetUnixHandle( hWritePipe, GENERIC_WRITE );
TRACE("win32 pipe: read=%d, write=%d, unix pipe: read=%d, write=%d\n",
hReadPipe,hWritePipe,read_pipe,x_fd);
TRACE("outbound unix pipe: read=%d, write=%d, pid=%d\n",write_fd[0],write_fd[1],getpid());
write_pipe=write_fd[1];
TRACE("Loading DOS VM support module\n");
if ((child=fork())<0) {
close(write_fd[0]);
close(read_pipe);
close(write_pipe);
close(x_fd);
CloseHandle(hReadPipe);
CloseHandle(hWritePipe);
return FALSE;
}
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 = (TDB *)GlobalLock16( GetCurrentTask() );
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 */
DOSVM_Enter( &context );
}
static void MZ_KillTask(void)
{
TRACE("killing DOS task\n");
VGA_Clean();
kill(dosmod_pid,SIGTERM);
}
void 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 */
BOOL MZ_LoadImage( LPCSTR cmdline )
{
WARN("DOS executables not supported on this platform\n");
SetLastError(ERROR_BAD_FORMAT);
return FALSE;
}
BOOL MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
{
/* can't happen */
SetLastError(ERROR_BAD_FORMAT);
return FALSE;
}
LPDOSTASK MZ_AllocDPMITask( void )
{
ERR("Actual real-mode calls not supported on this platform!\n");
return NULL;
}
void MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
{
ExitThread( retval );
}
#endif /* !MZ_SUPPORTED */
LPDOSTASK MZ_Current( void )
{
return dos_current;
}
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