diff options
| -rw-r--r-- | src/arch/x86/isa/decoder/x87.isa | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/arch/x86/isa/decoder/x87.isa b/src/arch/x86/isa/decoder/x87.isa index e44a18f65..ace96fbf6 100644 --- a/src/arch/x86/isa/decoder/x87.isa +++ b/src/arch/x86/isa/decoder/x87.isa @@ -291,7 +291,9 @@ format WarnUnimpl { //0x7: esc7(); 0x7: decode MODRM_REG { 0x0: decode MODRM_MOD { - 0x3: Inst::UD2(); + // The ffreep instruction isn't entirely real. It should work + // the same as ffree but then also pop the register stack. + 0x3: ffreep(); default: fild(); } 0x1: decode MODRM_MOD { |