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[NTVDM]

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Save/restore the processor state when executing/terminating nested tasks.


svn path=/trunk/; revision=67513
This commit is contained in:
Aleksandar Andrejevic 2015-05-02 18:51:03 +00:00
parent a4901dfae5
commit af48f83e26
2 changed files with 78 additions and 16 deletions
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87
reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c
View file

@ -46,6 +46,56 @@ static inline VOID DosSetPspCommandLine(WORD Segment, LPCSTR CommandLine)
RtlCopyMemory(PspBlock->CommandLine, CommandLine, DOS_CMDLINE_LENGTH);
}
static inline VOID DosSaveState(VOID)
{
PDOS_REGISTER_STATE State;
WORD StackPointer = getSP();
/* Allocate stack space for the registers */
StackPointer -= sizeof(DOS_REGISTER_STATE);
State = SEG_OFF_TO_PTR(getSS(), StackPointer);
/* Save */
State->EAX = getEAX();
State->ECX = getECX();
State->EDX = getEDX();
State->EBX = getEBX();
State->ESP = getESP();
State->EBP = getEBP();
State->ESI = getESI();
State->EDI = getEDI();
State->DS = getDS();
State->ES = getES();
State->FS = getFS();
State->GS = getGS();
State->Flags = getEFLAGS();
}
static inline VOID DosRestoreState(VOID)
{
PDOS_REGISTER_STATE State;
WORD StackPointer = getSP();
/* SS:SP points to the stack on the last entry to INT 21h */
StackPointer -= (STACK_FLAGS + 1) * 2; /* Interrupt parameters */
StackPointer -= sizeof(DOS_REGISTER_STATE); /* Pushed state structure */
State = SEG_OFF_TO_PTR(getSS(), StackPointer);
/* Restore */
setEAX(State->EAX);
setECX(State->ECX);
setEDX(State->EDX);
setEBX(State->EBX);
setEBP(State->EBP);
setESI(State->ESI);
setEDI(State->EDI);
setDS(State->DS);
setES(State->ES);
setFS(State->FS);
setGS(State->GS);
setEFLAGS(State->Flags);
}
static WORD DosCopyEnvironmentBlock(LPCSTR Environment OPTIONAL,
LPCSTR ProgramName)
{
@ -432,6 +482,9 @@ DWORD DosLoadExecutable(IN DOS_EXEC_TYPE LoadType,
if (LoadType == DOS_LOAD_AND_EXECUTE)
{
/* Save the program state */
if (CurrentPsp != SYSTEM_PSP) DosSaveState();
/* Set the initial segment registers */
setDS(Segment);
setES(Segment);
@ -750,6 +803,9 @@ VOID DosTerminateProcess(WORD Psp, BYTE ReturnCode, WORD KeepResident)
PDOS_MCB CurrentMcb;
LPDWORD IntVecTable = (LPDWORD)((ULONG_PTR)BaseAddress);
PDOS_PSP PspBlock = SEGMENT_TO_PSP(Psp);
#ifndef STANDALONE
VDM_COMMAND_INFO CommandInfo;
#endif
DPRINT("DosTerminateProcess: Psp 0x%04X, ReturnCode 0x%02X, KeepResident 0x%04X\n",
Psp,
@ -818,29 +874,25 @@ Done:
{
ResetEvent(VdmTaskEvent);
CpuUnsimulate();
return;
}
}
#ifndef STANDALONE
// FIXME: This is probably not the best way to do it
/* Check if this was a nested DOS task */
if (CurrentPsp != SYSTEM_PSP)
{
VDM_COMMAND_INFO CommandInfo;
/* Decrement the re-entry count */
CommandInfo.TaskId = SessionId;
CommandInfo.VDMState = VDM_DEC_REENTER_COUNT;
GetNextVDMCommand(&CommandInfo);
/* Decrement the re-entry count */
CommandInfo.TaskId = SessionId;
CommandInfo.VDMState = VDM_DEC_REENTER_COUNT;
GetNextVDMCommand(&CommandInfo);
/* Clear the structure */
RtlZeroMemory(&CommandInfo, sizeof(CommandInfo));
/* Clear the structure */
RtlZeroMemory(&CommandInfo, sizeof(CommandInfo));
/* Update the VDM state of the task */
CommandInfo.TaskId = SessionId;
CommandInfo.VDMState = VDM_FLAG_DONT_WAIT;
GetNextVDMCommand(&CommandInfo);
/* Update the VDM state of the task */
CommandInfo.TaskId = SessionId;
CommandInfo.VDMState = VDM_FLAG_DONT_WAIT;
GetNextVDMCommand(&CommandInfo);
}
#endif
/* Save the return code - Normal termination */
@ -850,6 +902,9 @@ Done:
setSS(HIWORD(SEGMENT_TO_PSP(CurrentPsp)->LastStack));
setSP(LOWORD(SEGMENT_TO_PSP(CurrentPsp)->LastStack));
/* Restore the program state */
DosRestoreState();
/* Return control to the parent process */
CpuExecute(HIWORD(PspBlock->TerminateAddress),
LOWORD(PspBlock->TerminateAddress));

7
reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.h
View file

@ -72,6 +72,13 @@ typedef struct _DOS_EXEC_PARAM_BLOCK
};
} DOS_EXEC_PARAM_BLOCK, *PDOS_EXEC_PARAM_BLOCK;
typedef struct _DOS_REGISTER_STATE
{
DWORD Flags;
WORD GS, FS, ES, DS;
DWORD EDI, ESI, EBP, ESP, EBX, EDX, ECX, EAX;
} DOS_REGISTER_STATE, *PDOS_REGISTER_STATE;
#pragma pack(pop)
/* VARIABLES ******************************************************************/