x86: change divide-by-zero fault to divide-error
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.
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2 changed files with 7 additions and 6 deletions
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@ -167,7 +167,7 @@ namespace X86ISA
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// Class | Type | vector | Cause | mnem
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//------------------------------------------------------------------------
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//Contrib Fault 0 Divide-by-Zero-Error #DE
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//Contrib Fault 0 Divide Error #DE
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//Benign Either 1 Debug #DB
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//Benign Interrupt 2 Non-Maskable-Interrupt #NMI
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//Benign Trap 3 Breakpoint #BP
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@ -193,11 +193,12 @@ namespace X86ISA
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//Benign Interrupt 0-255 External Interrupts #INTR
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//Benign Interrupt 0-255 Software Interrupts INTn
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class DivideByZero : public X86Fault
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// Note that
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class DivideError : public X86Fault
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{
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public:
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DivideByZero() :
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X86Fault("Divide-by-Zero-Error", "#DE", 0)
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DivideError() :
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X86Fault("Divide-Error", "#DE", 0)
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{}
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};
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@ -629,7 +629,7 @@ let {{
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uint64_t dividend = remainder;
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//Do the division.
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if (divisor == 0) {
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fault = std::make_shared<DivideByZero>();
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fault = std::make_shared<DivideError>();
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} else {
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divide(dividend, divisor, quotient, remainder);
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//Record the final results.
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@ -652,7 +652,7 @@ let {{
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//If we overshot, do nothing. This lets us unrool division loops a
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//little.
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if (divisor == 0) {
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fault = std::make_shared<DivideByZero>();
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fault = std::make_shared<DivideError>();
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} else if (remaining) {
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if (divisor & (ULL(1) << 63)) {
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while (remaining && !(dividend & (ULL(1) << 63))) {
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