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[NTVDM]

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Add two general-purpose variables to the interrupt handler stub stack.
Fix INT 29h so that it works correctly when the INT 10h, AH = 0Eh call is hooked.


svn path=/branches/ntvdm/; revision=61797
This commit is contained in:
Aleksandar Andrejevic 2014-01-25 00:53:10 +00:00
parent 6ddfa7d2b8
commit a3a28181c2
3 changed files with 39 additions and 15 deletions
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32
subsystems/ntvdm/dos/dos.c
View file

@ -2675,15 +2675,31 @@ VOID WINAPI DosFastConOut(LPWORD Stack)
* See Ralf Brown: http://www.ctyme.com/intr/rb-4124.htm
* for more information.
*/
UNREFERENCED_PARAMETER(Stack);
/*
* The default handler under DOS 2.x and 3.x simply calls INT 10/AH=0Eh.
* Do better and call directly VidBiosPrintCharacter: it's what INT 10/AH=0Eh
* does. Otherwise we would have to set BL to DOS_CHAR_ATTRIBUTE and
* BH to Bda->VideoPage.
*/
VidBiosPrintCharacter(getAL(), DOS_CHAR_ATTRIBUTE, Bda->VideoPage);
if (Stack[STACK_COUNTER] == 0)
{
Stack[STACK_COUNTER]++;
/* Save AX and BX */
Stack[STACK_VAR_A] = getAX();
Stack[STACK_VAR_B] = getBX();
/* Rewind the BOP manually, we can't use CF because the interrupt could modify it */
EmulatorExecute(getCS(), getIP() - 4);
/* Call INT 0x10, AH = 0x0E */
setAH(0x0E);
setBL(DOS_CHAR_ATTRIBUTE);
setBH(Bda->VideoPage);
EmulatorInterrupt(0x10);
}
else
{
/* Restore AX and BX */
setAX(Stack[STACK_VAR_A]);
setBX(Stack[STACK_VAR_B]);
}
}
VOID WINAPI DosInt2Fh(LPWORD Stack)

12
subsystems/ntvdm/emulator.h
View file

@ -34,11 +34,13 @@
#define EMULATOR_FLAG_VIP (1 << 20)
#define EMULATOR_FLAG_ID (1 << 21)
#define STACK_COUNTER 0
#define STACK_INT_NUM 1
#define STACK_IP 2
#define STACK_CS 3
#define STACK_FLAGS 4
#define STACK_VAR_B 0
#define STACK_VAR_A 1
#define STACK_COUNTER 2
#define STACK_INT_NUM 3
#define STACK_IP 4
#define STACK_CS 5
#define STACK_FLAGS 6
/* Basic Memory Management */

10
subsystems/ntvdm/int32.c
View file

@ -74,9 +74,15 @@ VOID InitializeInt32(WORD BiosSegment)
BiosCode[Offset++] = 0x6A; // push i
BiosCode[Offset++] = (UCHAR)i;
/* The counter variable (initialized to 0) */
BiosCode[Offset++] = 0x6A; // push 0
BiosCode[Offset++] = 0x00;
/* Stack variables */
BiosCode[Offset++] = 0x83; // sub sp, 4
BiosCode[Offset++] = 0xEC;
BiosCode[Offset++] = 0x04;
BopSeqOffset = COMMON_STUB_OFFSET - (Offset + 3);
BiosCode[Offset++] = 0xE9; // jmp near BOP_SEQ
@ -107,9 +113,9 @@ VOID InitializeInt32(WORD BiosSegment)
BiosCode[Offset++] = 0xF5;
// EXIT:
BiosCode[Offset++] = 0x83; // add sp, 4
BiosCode[Offset++] = 0x83; // add sp, 8
BiosCode[Offset++] = 0xC4;
BiosCode[Offset++] = 0x04;
BiosCode[Offset++] = 0x08;
BiosCode[Offset++] = 0xCF; // iret