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x86: change divide-by-zero fault to divide-error

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Same exception is raised whether division with zero is performed or the
quotient is greater than the maximum value that the provided space can hold.
Divide-by-Zero is the AMD terminology, while Divide-Error is Intel's.
This commit is contained in:
Nilay Vaish 2015-04-29 22:35:22 -05:00
parent 179787f31f
commit ee06fed656
2 changed files with 7 additions and 6 deletions
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9
src/arch/x86/faults.hh
View file

@ -167,7 +167,7 @@ namespace X86ISA
// Class | Type | vector | Cause | mnem
//------------------------------------------------------------------------
//Contrib Fault 0 Divide-by-Zero-Error #DE
//Contrib Fault 0 Divide Error #DE
//Benign Either 1 Debug #DB
//Benign Interrupt 2 Non-Maskable-Interrupt #NMI
//Benign Trap 3 Breakpoint #BP
@ -193,11 +193,12 @@ namespace X86ISA
//Benign Interrupt 0-255 External Interrupts #INTR
//Benign Interrupt 0-255 Software Interrupts INTn
class DivideByZero : public X86Fault
// Note that
class DivideError : public X86Fault
{
public:
DivideByZero() :
X86Fault("Divide-by-Zero-Error", "#DE", 0)
DivideError() :
X86Fault("Divide-Error", "#DE", 0)
{}
};

4
src/arch/x86/isa/microops/regop.isa
View file

@ -629,7 +629,7 @@ let {{
uint64_t dividend = remainder;
//Do the division.
if (divisor == 0) {
fault = std::make_shared<DivideByZero>();
fault = std::make_shared<DivideError>();
} else {
divide(dividend, divisor, quotient, remainder);
//Record the final results.
@ -652,7 +652,7 @@ let {{
//If we overshot, do nothing. This lets us unrool division loops a
//little.
if (divisor == 0) {
fault = std::make_shared<DivideByZero>();
fault = std::make_shared<DivideError>();
} else if (remaining) {
if (divisor & (ULL(1) << 63)) {
while (remaining && !(dividend & (ULL(1) << 63))) {