[ros-diffs] [aandrejevic] 68054: [NTVDM] Stubplement INT 25h and INT 26h. These interrupt calls are really weird since they don't IRET on return, so the default interrupt stub messes up the stack.

Author: aandrejevic
Date: Sun Jun  7 02:49:54 2015
New Revision: 68054

URL: http://svn.reactos.org/svn/reactos?rev=68054&view=rev
Log:
[NTVDM]
Stubplement INT 25h and INT 26h. These interrupt calls are really weird since
they don't IRET on return, so the default interrupt stub messes up the stack.


Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c	[iso-8859-1] Sun Jun  7
02:49:54 2015
@@ -1868,6 +1868,44 @@
     Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
 }
 
+VOID WINAPI DosAbsoluteRead(LPWORD Stack)
+{
+    /*
+     * This call should leave the flags on the stack for some reason,
+     * so move the stack by one word.
+     */
+    Stack[STACK_INT_NUM] = Stack[STACK_IP];
+    Stack[STACK_IP] = Stack[STACK_CS];
+    Stack[STACK_CS] = Stack[STACK_FLAGS];
+    setSP(LOWORD(getSP() - 2));
+
+    // TODO: NOT IMPLEMENTED;
+    UNIMPLEMENTED;
+
+    /* General failure */
+    setAX(0x800C);
+    Stack[STACK_FLAGS - 1] |= EMULATOR_FLAG_CF;
+}
+
+VOID WINAPI DosAbsoluteWrite(LPWORD Stack)
+{
+    /*
+     * This call should leave the flags on the stack for some reason,
+     * so move the stack by one word.
+     */
+    Stack[STACK_INT_NUM] = Stack[STACK_IP];
+    Stack[STACK_IP] = Stack[STACK_CS];
+    Stack[STACK_CS] = Stack[STACK_FLAGS];
+    setSP(LOWORD(getSP() - 2));
+
+    // TODO: NOT IMPLEMENTED;
+    UNIMPLEMENTED;
+
+    /* General failure */
+    setAX(0x800C);
+    Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
+}
+
 VOID WINAPI DosInt27h(LPWORD Stack)
 {
     DosTerminateProcess(getCS(), 0, (getDX() + 0x0F) >> 4);
@@ -2078,14 +2116,14 @@
 //  RegisterDosInt32(0x22, DosInt22h        ); // Termination
     RegisterDosInt32(0x23, DosBreakInterrupt); // Ctrl-C / Ctrl-Break
 //  RegisterDosInt32(0x24, DosInt24h        ); // Critical Error
+    RegisterDosInt32(0x25, DosAbsoluteRead  ); // Absolute Disk Read
+    RegisterDosInt32(0x26, DosAbsoluteWrite ); // Absolute Disk Write
     RegisterDosInt32(0x27, DosInt27h        ); // Terminate and Stay Resident
     RegisterDosInt32(0x28, DosIdle          ); // DOS Idle Interrupt
     RegisterDosInt32(0x29, DosFastConOut    ); // DOS 2+ Fast Console Output
     RegisterDosInt32(0x2F, DosInt2Fh        );
 
     /* Unimplemented DOS interrupts */
-    RegisterDosInt32(0x25, NULL); // Absolute Disk Read
-    RegisterDosInt32(0x26, NULL); // Absolute Disk Write
     RegisterDosInt32(0x2A, NULL); // Network - Installation Check
 
     /* Load the CON driver */