From: Gabe Black <gblack@eecs.umich.edu>
Date: Fri, 19 Oct 2007 05:41:18 +0000 (-0700)
Subject: X86: Implement the XLAT instruction.
X-Git-Tag: m5_2.0_beta4~43
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=46bd1c99a9fb3099ab9688ce43669cb7bc154a2a;p=gem5.git

X86: Implement the XLAT instruction.

--HG--
extra : convert_revision : 22d7d9e79e722293b4dc1e66d8610301dc04c5fa
---

diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index 23ba243fb..483e750b2 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -463,7 +463,7 @@
                 0x0: UD2();
                 default: WarnUnimpl::salc();
             }
-            0x7: WarnUnimpl::xlat();
+            0x7: XLAT();
         }
         ##include "x87.isa"
         0x1C: decode OPCODE_OP_BOTTOM3 {
diff --git a/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py b/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py
index bb286b976..c2ccb9d19 100644
--- a/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py
+++ b/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py
@@ -53,8 +53,12 @@
 #
 # Authors: Gabe Black
 
-microcode = ""
-#let {{
-#    class XLAT(Inst):
-#	"GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop XLAT {
+    zext t1, rax, 8
+    # Here, t1 can be used directly. The value of al is supposed to be treated
+    # as unsigned. Since we zero extended it from 8 bits above and the address
+    # size has to be at least 16 bits, t1 will not be sign extended.
+    ld rax, seg, [1, rbx, t1], dataSize=1
+};
+'''