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-rw-r--r--src/arch/x86/isa/specialize.isa5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/arch/x86/isa/specialize.isa b/src/arch/x86/isa/specialize.isa
index 3183f32ba..5165ea206 100644
--- a/src/arch/x86/isa/specialize.isa
+++ b/src/arch/x86/isa/specialize.isa
@@ -118,6 +118,7 @@ let {{
ModRMRegIndex = "(MODRM_REG | (REX_R << 3))"
ModRMRMIndex = "(MODRM_RM | (REX_B << 3))"
+ InstRegIndex = "(OPCODE_OP_BOTTOM3 | (REX_B << 3))"
# This function specializes the given piece of code to use a particular
# set of argument types described by "opTypes".
@@ -143,6 +144,10 @@ let {{
else:
print "Didn't recognize fixed register size %s!" % opType.rsize
Name += "_R"
+ elif opType.tag == "B":
+ # This refers to registers whose index is encoded as part of the opcode
+ Name += "_R"
+ env.addReg(InstRegIndex)
elif opType.tag == "M":
# This refers to memory. The macroop constructor sets up modrm
# addressing. Non memory modrm settings should cause an error.