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[NTVDM]

Browse source 
Add more debug output.
[SOFTX86]
Properly set the carry and overflow flags.


svn path=/branches/ntvdm/; revision=59410
This commit is contained in:
Aleksandar Andrejevic 2013-07-02 21:40:11 +00:00
parent 36f251eca0
commit c4ef9b6f44
4 changed files with 39 additions and 9 deletions
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14
lib/3rdparty/softx86/softx86/add.c vendored
View file

@ -386,13 +386,13 @@ sx86_uword op_sub16(softx86_ctx* ctx,sx86_uword src,sx86_uword val)
/* peform the addition */
ret = src - val;
/* if carry/overflow */
if (ret > src)
ctx->state->reg_flags.val |=
(SX86_CPUFLAG_CARRY | SX86_CPUFLAG_OVERFLOW);
else
ctx->state->reg_flags.val &=
~(SX86_CPUFLAG_CARRY | SX86_CPUFLAG_OVERFLOW);
/* if carry */
if (val > src) ctx->state->reg_flags.val |= SX86_CPUFLAG_CARRY;
else ctx->state->reg_flags.val &= ~SX86_CPUFLAG_CARRY;
/* if overflow */
if ((ret & 0x8000) != (src & 0x8000)) ctx->state->reg_flags.val |= SX86_CPUFLAG_OVERFLOW;
else ctx->state->reg_flags.val &= ~SX86_CPUFLAG_OVERFLOW;
/* if result treated as signed value is negative */
if (ret & 0x8000) ctx->state->reg_flags.val |= SX86_CPUFLAG_SIGN;

18
subsystems/ntvdm/bios.c
View file

@ -369,6 +369,12 @@ VOID BiosVideoService()
{
break;
}
default:
{
DPRINT1("BIOS Function INT 10h, AH = 0x%02X NOT IMPLEMENTED\n",
HIBYTE(Eax));
}
}
}
@ -404,6 +410,12 @@ VOID BiosKeyboardService()
break;
}
default:
{
DPRINT1("BIOS Function INT 16h, AH = 0x%02X NOT IMPLEMENTED\n",
HIBYTE(Eax));
}
}
}
@ -442,6 +454,12 @@ VOID BiosTimeService()
break;
}
default:
{
DPRINT1("BIOS Function INT 1Ah, AH = 0x%02X NOT IMPLEMENTED\n",
HIBYTE(Eax));
}
}
}

5
subsystems/ntvdm/emulator.c
View file

@ -385,6 +385,11 @@ VOID EmulatorClearFlag(ULONG Flag)
VOID EmulatorStep()
{
/* Print the current position - useful for debugging */
DPRINT("Executing at CS:IP = %04X:%04X\n",
EmulatorGetRegister(EMULATOR_REG_CS),
EmulatorContext.state->reg_ip);
/* Call the softx86 API */
if (!softx86_step(&EmulatorContext))
{

11
subsystems/ntvdm/ntvdm.c
View file

@ -69,7 +69,10 @@ INT wmain(INT argc, WCHAR *argv[])
{
INT i;
CHAR CommandLine[128];
DWORD CurrentTickCount, LastTickCount = 0, Cycles = 0, LastCyclePrintout = 0;
DWORD CurrentTickCount;
DWORD LastTickCount = GetTickCount();
DWORD Cycles = 0;
DWORD LastCyclePrintout = GetTickCount();
LARGE_INTEGER Frequency, LastTimerTick, Counter;
LONGLONG TimerTicks;
@ -79,7 +82,11 @@ INT wmain(INT argc, WCHAR *argv[])
/* The DOS command line must be ASCII */
WideCharToMultiByte(CP_ACP, 0, GetCommandLine(), -1, CommandLine, 128, NULL, NULL);
if (!EmulatorInitialize()) return 1;
if (!EmulatorInitialize())
{
wprintf(L"FATAL: Failed to initialize the CPU emulator\n");
return 1;
}
/* Initialize the performance counter (needed for hardware timers) */
if (!QueryPerformanceFrequency(&Frequency))