From d82d3bbda5b5860c5a69816ebbb8ae217c4bcef4 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Fri, 12 Oct 2007 20:07:28 -0700
Subject: X86: Implemented LODS.

--HG--
extra : convert_revision : 4bd8f15bbc25f5dce16ea0504ad6dd21805fa56a
---
 src/arch/x86/isa/decoder/one_byte_opcodes.isa      | 20 +++++------
 .../insts/general_purpose/string/load_string.py    | 42 +++++++++++++++-------
 2 files changed, 39 insertions(+), 23 deletions(-)

diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index f76912f06..aed7fb7e7 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -335,17 +335,17 @@
             0x6: StringTestInst::CMPS(Yb,Xb);
             0x7: StringTestInst::CMPS(Yv,Xv);
         }
-        0x15: decode OPCODE_OP_BOTTOM3 {
-            0x0: Inst::TEST(rAb,Ib);
-            0x1: Inst::TEST(rAv,Iz);
-            0x2: StringInst::STOS(Yb);
-            0x3: StringInst::STOS(Yv);
-            0x4: lods_Al_Xb();
-            0x5: lods_rAX_Xv();
-            0x6: StringTestInst::SCAS(Yb);
-            0x7: StringTestInst::SCAS(Yv);
-        }
         format Inst {
+            0x15: decode OPCODE_OP_BOTTOM3 {
+                0x0: TEST(rAb,Ib);
+                0x1: TEST(rAv,Iz);
+                0x2: StringInst::STOS(Yb);
+                0x3: StringInst::STOS(Yv);
+                0x4: StringInst::LODS(Xb);
+                0x5: StringInst::LODS(Xv);
+                0x6: StringTestInst::SCAS(Yb);
+                0x7: StringTestInst::SCAS(Yv);
+            }
             0x16: MOV(Bb,Ib);
             0x17: MOV(Bv,Iv);
             0x18: decode OPCODE_OP_BOTTOM3 {
diff --git a/src/arch/x86/isa/insts/general_purpose/string/load_string.py b/src/arch/x86/isa/insts/general_purpose/string/load_string.py
index 0f749a273..61525c2f2 100644
--- a/src/arch/x86/isa/insts/general_purpose/string/load_string.py
+++ b/src/arch/x86/isa/insts/general_purpose/string/load_string.py
@@ -53,16 +53,32 @@
 #
 # Authors: Gabe Black
 
-microcode = ""
-#let {{
-#    class LODS(Inst):
-#	"GenFault ${new UnimpInstFault}"
-#    class LODSB(Inst):
-#	"GenFault ${new UnimpInstFault}"
-#    class LODSW(Inst):
-#	"GenFault ${new UnimpInstFault}"
-#    class LODSD(Inst):
-#	"GenFault ${new UnimpInstFault}"
-#    class LODSQ(Inst):
-#	"GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop LODS_M {
+    # Find the constant we need to either add or subtract from rdi
+    ruflag t0, 10
+    movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+    subi t4, t0, dsz, dataSize=asz
+    mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+    ld rax, seg, [1, t0, rdi]
+
+    add rdi, rdi, t3, dataSize=asz
+};
+
+def macroop LODS_E_M {
+    # Find the constant we need to either add or subtract from rdi
+    ruflag t0, 10
+    movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+    subi t4, t0, dsz, dataSize=asz
+    mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+topOfLoop:
+    ld rax, seg, [1, t0, rdi]
+
+    subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
+    add rdi, rdi, t3, dataSize=asz
+    bri t0, label("topOfLoop"), flags=(nCEZF,)
+    fault "NoFault"
+};
+'''
-- 
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