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implement cmp instruction

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This commit is contained in:
Etaash Mathamsetty 2022-08-25 13:31:30 -04:00
parent 9eaeebf039
commit 63201ed22f
1 changed files with 43 additions and 0 deletions
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43
dlls/ntoskrnl.exe/instr.c
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@ -890,7 +890,50 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
}
break; /* Unable to emulate it */
}
case 0x38:
case 0x39: /* cmp r/m r/m */
{
ULONG64 *data = (ULONG64*)INSTR_GetOperandAddr(context, instr + 1, prefixlen + 1, long_addr, rex, segprefix, &len);
ULONG64 *data2 = (ULONG64*)INSTR_GetOperandAddr(context, instr + 2, prefixlen + 2, long_addr, rex, segprefix, &len);
SIZE_T offset = (BYTE*)data - user_shared_data;
SIZE_T offset2 = (BYTE*)data2 - user_shared_data;
SIZE_T data_size = get_op_size(long_op, rex);
BOOL is_user_shared_data = FALSE;
ULONG64 cmp1, cmp2, bitmask;
if(offset <= KSHARED_USER_DATA_PAGE_SIZE - data_size)
{
TRACE("USD offset %#x at %p\n",(unsigned int) offset, (void*) context->Rip);
data = (ULONG64*)(wine_user_shared_data + offset);
is_user_shared_data = TRUE;
}
if(offset2 <= KSHARED_USER_DATA_PAGE_SIZE - data_size)
{
TRACE("USD offset %#x at %p\n", (unsigned int) offset2, (void*) context->Rip);
data2 = (ULONG64*)(wine_user_shared_data + offset2);
is_user_shared_data = TRUE;
}
if(is_user_shared_data)
{
/* clear ZF and CF */
context->EFlags &= ~(1UL << 6);
context->EFlags &= ~(1UL);
bitmask = ((1ULL << (8 * data_size)) - 1);
/* FIXME("bitmask %llx\n", bitmask); */
cmp1 = (*data) & bitmask;
cmp2 = (*data2) & bitmask;
if(cmp1 == cmp2)
context->EFlags |= (1UL << 6); /* ZF */
else if(cmp1 < cmp2)
context->EFlags |= 1UL; /* CF */
context->Rip += prefixlen + len + 1;
return ExceptionContinueExecution;
}
break;
}
case 0xa0: /* mov Ob, AL */
case 0xa1: /* mov Ovqp, rAX */
{