From e596e524985cfb1f4d46aceebe69bb7fcd94cf04 Mon Sep 17 00:00:00 2001
From: Nilay Vaish <nilay@cs.wisc.edu>
Date: Mon, 13 Apr 2015 17:33:57 -0500
Subject: [PATCH] x86: implements x87 mult/div instructions

---
 src/arch/x86/isa/decoder/x87.isa              | 23 +++++---
 .../x86/isa/insts/x87/arithmetic/division.py  | 59 ++++++++++++++++++-
 .../insts/x87/arithmetic/multiplication.py    | 59 ++++++++++++++++++-
 3 files changed, 130 insertions(+), 11 deletions(-)

diff --git a/src/arch/x86/isa/decoder/x87.isa b/src/arch/x86/isa/decoder/x87.isa
index b325728ba..b53c48e78 100644
--- a/src/arch/x86/isa/decoder/x87.isa
+++ b/src/arch/x86/isa/decoder/x87.isa
@@ -45,7 +45,10 @@ format WarnUnimpl {
                 // 32-bit memory operand
                 default: Inst::FADD1(Md);
             }
-            0x1: fmul();
+            0x1: decode MODRM_MOD {
+                0x3: Inst::FMUL1(Eq);
+                default: Inst::FMUL1(Md);
+            }
             0x2: fcom();
             0x3: fcomp();
             0x4: decode MODRM_MOD {
@@ -53,7 +56,10 @@ format WarnUnimpl {
                 default: Inst::FSUB1(Md);
             }
             0x5: fsubr();
-            0x6: fdiv();
+            0x6: decode MODRM_MOD {
+                0x3: Inst::FDIV1(Eq);
+                default: Inst::FDIV1(Md);
+            }
             0x7: fdivr();
         }
         0x1: decode MODRM_REG {
@@ -210,7 +216,10 @@ format WarnUnimpl {
                 0x3: Inst::FADD2(Eq);
                 default: Inst::FADD2(Mq);
             }
-            0x1: fmul();
+            0x1: decode MODRM_MOD {
+                0x3: Inst::FMUL2(Eq);
+                default: Inst::FMUL2(Mq);
+            }
             0x2: decode MODRM_MOD {
                 0x3: Inst::UD2();
                 default: fcom();
@@ -229,10 +238,10 @@ format WarnUnimpl {
             }
             0x6: decode MODRM_MOD {
                 0x3: fdivr();
-                default: fdiv();
+                default: Inst::FDIV2(Mq);
             }
             0x7: decode MODRM_MOD {
-                0x3: fdiv();
+                0x3: Inst::FDIV2(Eq);
                 default: fdivr();
             }
         }
@@ -282,7 +291,7 @@ format WarnUnimpl {
                 default: fiadd();
             }
             0x1: decode MODRM_MOD {
-                0x3: fmulp();
+                0x3: Inst::FMULP(Eq);
                 default: fimul();
             }
             0x2: decode MODRM_MOD {
@@ -312,7 +321,7 @@ format WarnUnimpl {
                 default: fidiv();
             }
             0x7: decode MODRM_MOD {
-                0x3: fdivp();
+                0x3: Inst::FDIVP(Eq);
                 default: fidivr();
             }
         }
diff --git a/src/arch/x86/isa/insts/x87/arithmetic/division.py b/src/arch/x86/isa/insts/x87/arithmetic/division.py
index 3e4108d18..fe9829913 100644
--- a/src/arch/x86/isa/insts/x87/arithmetic/division.py
+++ b/src/arch/x86/isa/insts/x87/arithmetic/division.py
@@ -36,8 +36,63 @@
 # Authors: Gabe Black
 
 microcode = '''
-# FDIV
-# FDIVP
+def macroop FDIV1_R
+{
+    divfp st(0), st(0), sti
+};
+
+
+def macroop FDIV1_M
+{
+    ldfp87 ufp1, seg, sib, disp
+    divfp st(0), st(0), ufp1
+};
+
+def macroop FDIV1_P
+{
+    rdip t7
+    ldfp87 ufp1, seg, riprel, disp
+    divfp st(0), st(0), ufp1
+};
+
+def macroop FDIV2_R
+{
+    divfp sti, sti, st(0)
+};
+
+def macroop FDIV2_M
+{
+    ldfp87 ufp1, seg, sib, disp
+    divfp st(0), st(0), ufp1
+};
+
+def macroop FDIV2_P
+{
+    rdip t7
+    ldfp87 ufp1, seg, riprel, disp
+    divfp st(0), st(0), ufp1
+};
+
+def macroop FDIVP
+{
+    divfp st(1), st(1), st(0), spm=1
+};
+
+def macroop FDIVP_R
+{
+    divfp sti, sti, st(0), spm=1
+};
+
+def macroop FDIVP_M
+{
+    fault "std::make_shared<UnimpInstFault>()"
+};
+
+def macroop FDIVP_P
+{
+   fault "std::make_shared<UnimpInstFault>()"
+};
+
 # FIDIV
 # FDIVR
 # FDIVRP
diff --git a/src/arch/x86/isa/insts/x87/arithmetic/multiplication.py b/src/arch/x86/isa/insts/x87/arithmetic/multiplication.py
index d47f3fa6c..543896f3c 100644
--- a/src/arch/x86/isa/insts/x87/arithmetic/multiplication.py
+++ b/src/arch/x86/isa/insts/x87/arithmetic/multiplication.py
@@ -36,7 +36,62 @@
 # Authors: Gabe Black
 
 microcode = '''
-# FMUL
-# FMULP
+def macroop FMUL1_R
+{
+    mulfp st(0), sti, st(0)
+};
+
+
+def macroop FMUL1_M
+{
+    ldfp87 ufp1, seg, sib, disp
+    mulfp st(0), st(0), ufp1
+};
+
+def macroop FMUL1_P
+{
+    rdip t7
+    ldfp87 ufp1, seg, riprel, disp
+    mulfp st(0), st(0), ufp1
+};
+
+def macroop FMUL2_R
+{
+    mulfp sti, sti, st(0)
+};
+
+def macroop FMUL2_M
+{
+    ldfp87 ufp1, seg, sib, disp
+    mulfp st(0), st(0), ufp1
+};
+
+def macroop FMUL2_P
+{
+    rdip t7
+    ldfp87 ufp1, seg, riprel, disp
+    mulfp st(0), st(0), ufp1
+};
+
+def macroop FMULP
+{
+    mulfp st(1), st(0), st(1), spm=1
+};
+
+def macroop FMULP_R
+{
+    mulfp sti, sti, st(0), spm=1
+};
+
+def macroop FMULP_M
+{
+    fault "std::make_shared<UnimpInstFault>()"
+};
+
+def macroop FMULP_P
+{
+   fault "std::make_shared<UnimpInstFault>()"
+};
+
 # FIMUL
 '''
-- 
2.30.2