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-rw-r--r--src/arch/x86/isa/decoder/two_byte_opcodes.isa17
-rw-r--r--src/arch/x86/isa/formats/cpuid.isa5
2 files changed, 13 insertions, 9 deletions
diff --git a/src/arch/x86/isa/decoder/two_byte_opcodes.isa b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
index 34b79a6a4..3b187d625 100644
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
@@ -721,12 +721,19 @@
0x1: pop_fs();
0x2: CPUIDInst::CPUID({{
CpuidResult result;
- success = doCpuid(xc->tcBase(), bits(Rax, 31, 0),
+ bool success = doCpuid(xc->tcBase(), bits(Rax, 31, 0),
bits(Rcx, 31, 0), result);
- Rax = result.rax;
- Rbx = result.rbx;
- Rcx = result.rcx;
- Rdx = result.rdx;
+ if (success) {
+ Rax = result.rax;
+ Rbx = result.rbx;
+ Rcx = result.rcx;
+ Rdx = result.rdx;
+ } else {
+ Rax = Rax;
+ Rbx = Rbx;
+ Rcx = Rcx;
+ Rdx = Rdx;
+ }
}});
0x3: Inst::BT(Ev,Gv);
0x4: Inst::SHLD(Ev,Gv,Ib);
diff --git a/src/arch/x86/isa/formats/cpuid.isa b/src/arch/x86/isa/formats/cpuid.isa
index cc3070ded..535f1e925 100644
--- a/src/arch/x86/isa/formats/cpuid.isa
+++ b/src/arch/x86/isa/formats/cpuid.isa
@@ -73,13 +73,10 @@ def template CPUIDExecute {{
{
// If the CPUID instruction used a valid function number, this will
// be set to true. Otherwise, the instruction does nothing.
- bool success;
%(op_decl)s;
%(op_rd)s;
%(code)s;
- if (success) {
- %(op_wb)s;
- }
+ %(op_wb)s;
return NoFault;
}
}};