assembler: Handle wait-on-reservation extension (Zawrs)

README.md

@@ -31,6 +31,7 @@ Includes both 32-bit and 64-bit instructions in the following:
 | S         | 1.12    |
 | V         | 1.0     |
 | Sstc      | 0.5.4   |
+| Zawrs     | 1.01    |
 | Zfh       | 1.0     |
 | Zfhmin    | 1.0     |
 | Zicbom    | 1.0     |

include/biscuit/assembler.hpp

@@ -246,6 +246,10 @@ class Assembler {
     void SRLW(GPR rd, GPR lhs, GPR rhs) noexcept;
     void SUBW(GPR rd, GPR lhs, GPR rhs) noexcept;
 
+    // Zawrs Extension Instructions
+    void WRS_NTO() noexcept;
+    void WRS_STO() noexcept;
+
     // Zicond Extension Instructions
     void CZERO_EQZ(GPR rd, GPR value, GPR condition) noexcept;
     void CZERO_NEZ(GPR rd, GPR value, GPR condition) noexcept;

src/assembler.cpp

@@ -776,6 +776,15 @@ void Assembler::SUBW(GPR rd, GPR lhs, GPR rhs) noexcept {
     EmitRType(m_buffer, 0b0100000, rhs, lhs, 0b000, rd, 0b0111011);
 }
 
+// Zawrs Extension Instructions
+
+void Assembler::WRS_NTO() noexcept {
+    EmitIType(m_buffer, 0b01101, x0, 0, x0, 0b1110011);
+}
+void Assembler::WRS_STO() noexcept {
+    EmitIType(m_buffer, 0b11101, x0, 0, x0, 0b1110011);
+}
+
 // Zicond Extension Instructions
 
 void Assembler::CZERO_EQZ(GPR rd, GPR value, GPR condition) noexcept {

tests/CMakeLists.txt

@@ -15,6 +15,7 @@ add_executable(${PROJECT_NAME}
     src/assembler_rvm_tests.cpp
     src/assembler_rvq_tests.cpp
     src/assembler_rvv_tests.cpp
+    src/assembler_zawrs_tests.cpp
     src/assembler_zicond_tests.cpp
     src/assembler_zicsr_tests.cpp
     src/assembler_zihintntl_tests.cpp

tests/src/assembler_zawrs_tests.cpp

@@ -0,0 +1,21 @@
+#include <catch/catch.hpp>
+
+#include <biscuit/assembler.hpp>
+
+using namespace biscuit;
+
+TEST_CASE("WRS.NTO", "[Zawrs]") {
+    uint32_t value = 0;
+    Assembler as(reinterpret_cast<uint8_t*>(&value), sizeof(value));
+
+    as.WRS_NTO();
+    REQUIRE(value == 0x00D00073);
+}
+
+TEST_CASE("WRS.STO", "[Zawrs]") {
+    uint32_t value = 0;
+    Assembler as(reinterpret_cast<uint8_t*>(&value), sizeof(value));
+
+    as.WRS_STO();
+    REQUIRE(value == 0x01D00073);
+}