diff options
| author | Gabe Black <gblack@eecs.umich.edu> | 2009-02-27 09:26:09 -0800 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-02-27 09:26:09 -0800 |
| commit | 27b751ec46e59166867cedbf6da3ee19453671bd (patch) | |
| tree | 9630142ea6f6f9666ad1ff04528347ea9ec90507 /src | |
| parent | aa51c01d697124fac654b3e87a99bb2d613cae72 (diff) | |
| download | gem5-27b751ec46e59166867cedbf6da3ee19453671bd.tar.xz | |
X86: Don't treat the REX prefixes as prefixes in 32 bit modes. These are inc/dec instructions.
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/x86/predecoder.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/arch/x86/predecoder.cc b/src/arch/x86/predecoder.cc index 9d60089e3..620ab89ea 100644 --- a/src/arch/x86/predecoder.cc +++ b/src/arch/x86/predecoder.cc @@ -136,7 +136,10 @@ namespace X86ISA { uint8_t prefix = Prefixes[nextByte]; State nextState = PrefixState; - if(prefix) + // REX prefixes are only recognized in 64 bit mode. + if (prefix == RexPrefix && emi.mode.submode != SixtyFourBitMode) + prefix = 0; + if (prefix) consumeByte(); switch(prefix) { |