static VOID WINAPI DosCmdInterpreterBop(LPWORD Stack)
{
/* Get the Function Number and skip it */
BYTE FuncNum = *(PBYTE)SEG_OFF_TO_PTR(getCS(), getIP());
setIP(getIP() + 1);
switch (FuncNum)
{
/* Kill the VDM */
case 0x00:
{
/* Stop the VDM */
EmulatorTerminate();
return;
}
/*
* Get a new app to start
*
* Input
* DS:DX : Data block.
*
* Output
* CF : 0: Success; 1: Failure.
*/
case 0x01:
{
CmdStartProcess();
break;
}
/*
* Check binary format
*
* Input
* DS:DX : Program to check.
*
* Output
* CF : 0: Success; 1: Failure.
* AX : Error code.
*/
case 0x07:
{
DWORD BinaryType;
LPSTR ProgramName = (LPSTR)SEG_OFF_TO_PTR(getDS(), getDX());
if (!GetBinaryTypeA(ProgramName, &BinaryType))
{
/* An error happened, bail out */
setCF(1);
setAX(LOWORD(GetLastError()));
break;
}
// FIXME: We only support DOS binaries for now...
ASSERT(BinaryType == SCS_DOS_BINARY);
if (BinaryType != SCS_DOS_BINARY)
{
/* An error happened, bail out */
setCF(1);
setAX(LOWORD(ERROR_BAD_EXE_FORMAT));
break;
}
/* Return success: DOS application */
setCF(0);
break;
}
/*
* Start an external command
*
* Input
* DS:SI : Command to start.
* ES : Environment block segment.
* AL : Current drive number.
* AH : 0: Directly start the command;
* 1: Use "cmd.exe /c" to start the command.
*
* Output
* CF : 0: Shell-out; 1: Continue.
* AL : Error/Exit code.
*/
case 0x08:
{
CmdStartExternalCommand();
break;
}
/*
* Start the default 32-bit command interpreter (COMSPEC)
*
* Input
* ES : Environment block segment.
* AL : Current drive number.
*
* Output
* CF : 0: Shell-out; 1: Continue.
* AL : Error/Exit code.
*/
case 0x0A:
{
CmdStartComSpec32();
break;
}
/*
* Set exit code
*
* Input
* DX : Exit code
*
* Output
* CF : 0: Shell-out; 1: Continue.
*/
case 0x0B:
{
CmdSetExitCode();
break;
}
/*
* Get start information
*
* Output
* AL : 0 (resp. 1): Started from (resp. without) an existing console.
*/
case 0x10:
{
#ifndef STANDALONE
/*
* When a new instance of our (internal) COMMAND.COM is started,
* we check whether we need to run a 32-bit COMSPEC. This goes by
* checking whether we were started in a new console (no parent
* console process) or from an existing one.
*
* However COMMAND.COM can also be started in the case where a
* 32-bit process (started by a 16-bit parent) wants to start a new
* 16-bit process: to ensure DOS reentry we need to start a new
* instance of COMMAND.COM. On Windows the COMMAND.COM is started
* just before the 32-bit process (in fact, it is this COMMAND.COM
* which starts the 32-bit process via an undocumented command-line
* switch '/z', which syntax is:
* COMMAND.COM /z\bAPPNAME.EXE
* notice the '\b' character inserted in-between. Then COMMAND.COM
* issues a BOP_CMD 08h with AH=00h to start the process).
*
* Instead, we do the reverse, i.e. we start the 32-bit process,
* and *only* if needed, i.e. if this process wants to start a
* new 16-bit process, we start our COMMAND.COM.
*
* The problem we then face is that our COMMAND.COM will possibly
* want to start a new COMSPEC, however we do not want this.
* The chosen solution is to flag this case -- done with the 'Reentry'
* boolean -- so that COMMAND.COM will not attempt to start COMSPEC
* but instead will directly try to start the 16-bit process.
*/
// setAL(SessionId != 0);
setAL((SessionId != 0) && !Reentry);
/* Reset 'Reentry' */
Reentry = FALSE;
#else
setAL(0);
#endif
break;
}
default:
{
DPRINT1("Unknown DOS CMD Interpreter BOP Function: 0x%02X\n", FuncNum);
// setCF(1); // Disable, otherwise we enter an infinite loop
break;
}
}
}
/***********************************************************************
* MZ_Exec
*
* this may only be called from existing DOS processes
*/
BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
{
DWORD binType;
STARTUPINFOA st;
PROCESS_INFORMATION pe;
HANDLE hFile;
BOOL ret = FALSE;
if(!GetBinaryTypeA(filename, &binType)) /* determine what kind of binary this is */
{
return FALSE; /* binary is not an executable */
}
/* handle non-dos executables */
if(binType != SCS_DOS_BINARY)
{
if(func == 0) /* load and execute */
{
LPSTR fullCmdLine;
WORD fullCmdLength;
LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
PDB16 *psp = (PDB16 *)psp_start;
ExecBlock *blk = (ExecBlock *)paramblk;
LPBYTE cmdline = PTR_REAL_TO_LIN(SELECTOROF(blk->cmdline),OFFSETOF(blk->cmdline));
LPBYTE envblock = PTR_REAL_TO_LIN(psp->environment, 0);
int cmdLength = cmdline[0];
/*
* If cmdLength is 127, command tail is truncated and environment
* variable CMDLINE should contain full command line
* (this includes filename).
*/
if (cmdLength == 127)
{
FIXME( "CMDLINE argument passing is unimplemented.\n" );
cmdLength = 126; /* FIXME */
}
fullCmdLength = (strlen(filename) + 1) + cmdLength + 1; /* filename + space + cmdline + terminating null character */
fullCmdLine = HeapAlloc(GetProcessHeap(), 0, fullCmdLength);
if(!fullCmdLine) return FALSE; /* return false on memory alloc failure */
/* build the full command line from the executable file and the command line being passed in */
snprintf(fullCmdLine, fullCmdLength, "%s ", filename); /* start off with the executable filename and a space */
memcpy(fullCmdLine + strlen(fullCmdLine), cmdline + 1, cmdLength); /* append cmdline onto the end */
fullCmdLine[fullCmdLength - 1] = 0; /* null terminate string */
ZeroMemory (&st, sizeof(STARTUPINFOA));
st.cb = sizeof(STARTUPINFOA);
ret = CreateProcessA (NULL, fullCmdLine, NULL, NULL, TRUE, 0, envblock, NULL, &st, &pe);
/* wait for the app to finish and clean up PROCESS_INFORMATION handles */
if(ret)
{
WaitForSingleObject(pe.hProcess, INFINITE); /* wait here until the child process is complete */
CloseHandle(pe.hProcess);
CloseHandle(pe.hThread);
}
HeapFree(GetProcessHeap(), 0, fullCmdLine); /* free the memory we allocated */
}
else
{
FIXME("EXEC type of %d not implemented for non-dos executables\n", func);
ret = FALSE;
}
return ret;
} /* if(binType != SCS_DOS_BINARY) */
/* handle dos executables */
hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, 0);
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)DOSVM_psp << 4);
PDB16 *psp = (PDB16 *)psp_start;
psp->saveStack = (DWORD)MAKESEGPTR(context->SegSs, LOWORD(context->Esp));
}
ret = MZ_DoLoadImage( hFile, filename, NULL, ((ExecBlock *)paramblk)->env_seg );
if (ret) {
/* MZ_LoadImage created a new PSP and loaded new values into it,
* let's work on the new values now */
LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
ExecBlock *blk = (ExecBlock *)paramblk;
LPBYTE cmdline = PTR_REAL_TO_LIN(SELECTOROF(blk->cmdline),OFFSETOF(blk->cmdline));
/* First character contains the length of the command line. */
MZ_FillPSP(psp_start, (LPSTR)cmdline + 1, cmdline[0]);
/* the lame MS-DOS engineers decided that the return address should be in int22 */
DOSVM_SetRMHandler(0x22, (FARPROC16)MAKESEGPTR(context->SegCs, LOWORD(context->Eip)));
if (func) {
/* don't execute, just return startup state */
/*
* From Ralph Brown:
* For function 01h, the AX value to be passed to the child program
* is put on top of the child's stack
*/
LPBYTE stack;
init_sp -= 2;
stack = (LPBYTE) CTX_SEG_OFF_TO_LIN(context, init_ss, init_sp);
/* FIXME: push AX correctly */
stack[0] = 0x00; /* push AL */
stack[1] = 0x00; /* push AH */
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 = DOSVM_psp;
context->SegEs = DOSVM_psp;
context->Eax = 0;
}
}
break;
case 3: /* load overlay */
{
OverlayBlock *blk = (OverlayBlock *)paramblk;
ret = MZ_DoLoadImage( hFile, filename, blk, 0);
}
break;
default:
FIXME("EXEC load type %d not implemented\n", func);
SetLastError(ERROR_INVALID_FUNCTION);
break;
}
CloseHandle(hFile);
return ret;
}
