From ae5dbcbed6d279351f3479c5534c612f0f2624bd Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Sun, 21 Jan 2018 19:50:31 -0500
Subject: [PATCH] A64: Implement HINT, NOP, YIELD, WFE, WFI, SEV, and SEVL

Truly the most difficult A64 instructions to implement.
---
 src/CMakeLists.txt                         |  1 +
 src/frontend/A64/decoder/a64.inc           | 14 ++++----
 src/frontend/A64/translate/impl/system.cpp | 41 ++++++++++++++++++++++
 3 files changed, 49 insertions(+), 7 deletions(-)
 create mode 100644 src/frontend/A64/translate/impl/system.cpp

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 09438116..1c7387bf 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -75,6 +75,7 @@ add_library(dynarmic
     frontend/A64/translate/impl/load_store_register_pair.cpp
     frontend/A64/translate/impl/move_wide.cpp
     frontend/A64/translate/impl/simd_three_same.cpp
+    frontend/A64/translate/impl/system.cpp
     frontend/A64/translate/translate.cpp
     frontend/A64/translate/translate.h
     frontend/A64/types.cpp
diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index be0f0cb7..fceda5a0 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -42,13 +42,13 @@ INST(SVC,                    "SVC",                                       "11010
 
 // System
 //INST(MSR_imm,                "MSR (immediate)",                           "1101010100000ooo0100MMMMooo11111")
-//INST(HINT,                   "HINT",                                      "11010101000000110010MMMMooo11111")
-//INST(NOP,                    "NOP",                                       "11010101000000110010000000011111")
-//INST(YIELD,                  "YIELD",                                     "11010101000000110010000000111111")
-//INST(WFE,                    "WFE",                                       "11010101000000110010000001011111")
-//INST(WFI,                    "WFI",                                       "11010101000000110010000001111111")
-//INST(SEV,                    "SEV",                                       "11010101000000110010000010011111")
-//INST(SEVL,                   "SEVL",                                      "11010101000000110010000010111111")
+INST(HINT,                   "HINT",                                      "11010101000000110010MMMMooo11111")
+INST(NOP,                    "NOP",                                       "11010101000000110010000000011111")
+INST(YIELD,                  "YIELD",                                     "11010101000000110010000000111111")
+INST(WFE,                    "WFE",                                       "11010101000000110010000001011111")
+INST(WFI,                    "WFI",                                       "11010101000000110010000001111111")
+INST(SEV,                    "SEV",                                       "11010101000000110010000010011111")
+INST(SEVL,                   "SEVL",                                      "11010101000000110010000010111111")
 //INST(XPAC_1,                 "XPACD, XPACI, XPACLRI",                     "110110101100000101000D11111ddddd")
 //INST(XPAC_2,                 "XPACD, XPACI, XPACLRI",                     "11010101000000110010000011111111")
 //INST(PACIA_1,                "PACIA, PACIA1716, PACIASP, PACIAZ, PACIZA", "110110101100000100Z000nnnnnddddd")
diff --git a/src/frontend/A64/translate/impl/system.cpp b/src/frontend/A64/translate/impl/system.cpp
new file mode 100644
index 00000000..0d420302
--- /dev/null
+++ b/src/frontend/A64/translate/impl/system.cpp
@@ -0,0 +1,41 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include "frontend/A64/translate/impl/impl.h"
+
+namespace Dynarmic {
+namespace A64 {
+
+bool TranslatorVisitor::HINT([[maybe_unused]] Imm<4> CRm, [[maybe_unused]] Imm<3> op2) {
+    return true;
+}
+
+bool TranslatorVisitor::NOP() {
+    return true;
+}
+
+bool TranslatorVisitor::YIELD() {
+    return true;
+}
+
+bool TranslatorVisitor::WFE() {
+    return true;
+}
+
+bool TranslatorVisitor::WFI() {
+    return true;
+}
+
+bool TranslatorVisitor::SEV() {
+    return true;
+}
+
+bool TranslatorVisitor::SEVL() {
+    return true;
+}
+
+} // namespace A64
+} // namespace Dynarmic