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[FAST486]

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Check for division by zero, and generate the appropriate exception.


svn path=/branches/ntvdm/; revision=61204
This commit is contained in:
Aleksandar Andrejevic 2013-12-03 00:56:47 +00:00
parent e7a6deb93f
commit 2064d10bad
1 changed files with 36 additions and 4 deletions
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40
lib/fast486/opgroups.c
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@ -1012,8 +1012,17 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroupF6)
/* DIV */ /* DIV */
case 6: case 6:
{ {
UCHAR Quotient = State->GeneralRegs[FAST486_REG_EAX].LowWord / Value; UCHAR Quotient, Remainder;
UCHAR Remainder = State->GeneralRegs[FAST486_REG_EAX].LowWord % Value;
if (Value == 0)
{
/* Divide error */
Fast486Exception(State, FAST486_EXCEPTION_DE);
return FALSE;
}
Quotient = State->GeneralRegs[FAST486_REG_EAX].LowWord / Value;
Remainder = State->GeneralRegs[FAST486_REG_EAX].LowWord % Value;
/* Write back the results */ /* Write back the results */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Quotient; State->GeneralRegs[FAST486_REG_EAX].LowByte = Quotient;
@ -1025,8 +1034,17 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroupF6)
/* IDIV */ /* IDIV */
case 7: case 7:
{ {
CHAR Quotient = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord / (CHAR)Value; CHAR Quotient, Remainder;
CHAR Remainder = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord % (CHAR)Value;
if (Value == 0)
{
/* Divide error */
Fast486Exception(State, FAST486_EXCEPTION_DE);
return FALSE;
}
Quotient = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord / (CHAR)Value;
Remainder = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord % (CHAR)Value;
/* Write back the results */ /* Write back the results */
State->GeneralRegs[FAST486_REG_EAX].LowByte = (UCHAR)Quotient; State->GeneralRegs[FAST486_REG_EAX].LowByte = (UCHAR)Quotient;
@ -1225,6 +1243,13 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroupF7)
/* DIV */ /* DIV */
case 6: case 6:
{ {
if (Value == 0)
{
/* Divide error */
Fast486Exception(State, FAST486_EXCEPTION_DE);
return FALSE;
}
if (OperandSize) if (OperandSize)
{ {
ULONGLONG Dividend = (ULONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long ULONGLONG Dividend = (ULONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long
@ -1254,6 +1279,13 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroupF7)
/* IDIV */ /* IDIV */
case 7: case 7:
{ {
if (Value == 0)
{
/* Divide error */
Fast486Exception(State, FAST486_EXCEPTION_DE);
return FALSE;
}
if (OperandSize) if (OperandSize)
{ {
LONGLONG Dividend = (LONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long LONGLONG Dividend = (LONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long