--- /dev/null
+//===-- TestLoongArchEmulator.cpp -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Core/Address.h"
+#include "lldb/Core/Disassembler.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Utility/ArchSpec.h"
+#include "lldb/Utility/RegisterValue.h"
+#include "gtest/gtest.h"
+
+#include "Plugins/Instruction/LoongArch/EmulateInstructionLoongArch.h"
+#include "Plugins/Process/Utility/RegisterInfoPOSIX_loongarch64.h"
+#include "Plugins/Process/Utility/lldb-loongarch-register-enums.h"
+
+using namespace llvm;
+using namespace lldb;
+using namespace lldb_private;
+
+#define GEN_BCOND_TEST(bit, name, rj_val, rd_val_branched, rd_val_continued) \
+ TEST_F(LoongArch##bit##EmulatorTester, test##name##branched) { \
+ testBcondBranch(this, name, true, rj_val, rd_val_branched); \
+ } \
+ TEST_F(LoongArch##bit##EmulatorTester, test##name##continued) { \
+ testBcondBranch(this, name, false, rj_val, rd_val_continued); \
+ }
+
+#define GEN_BZCOND_TEST(bit, name, rj_val_branched, rj_val_continued) \
+ TEST_F(LoongArch##bit##EmulatorTester, test##name##branched) { \
+ testBZcondBranch(this, name, true, rj_val_branched); \
+ } \
+ TEST_F(LoongArch##bit##EmulatorTester, test##name##continued) { \
+ testBZcondBranch(this, name, false, rj_val_continued); \
+ }
+
+struct LoongArch64EmulatorTester : public EmulateInstructionLoongArch,
+ testing::Test {
+ RegisterInfoPOSIX_loongarch64::GPR gpr;
+ RegisterInfoPOSIX_loongarch64::FPR fpr;
+
+ LoongArch64EmulatorTester(
+ std::string triple = "loongarch64-unknown-linux-gnu")
+ : EmulateInstructionLoongArch(ArchSpec(triple)) {
+ EmulateInstruction::SetReadRegCallback(ReadRegisterCallback);
+ EmulateInstruction::SetWriteRegCallback(WriteRegisterCallback);
+ }
+
+ static bool ReadRegisterCallback(EmulateInstruction *instruction, void *baton,
+ const RegisterInfo *reg_info,
+ RegisterValue ®_value) {
+ LoongArch64EmulatorTester *tester =
+ (LoongArch64EmulatorTester *)instruction;
+ uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
+ if (reg >= gpr_r0_loongarch && reg <= gpr_r31_loongarch)
+ reg_value.SetUInt(tester->gpr.gpr[reg], reg_info->byte_size);
+ else if (reg == gpr_orig_a0_loongarch)
+ reg_value.SetUInt(tester->gpr.orig_a0, reg_info->byte_size);
+ else if (reg == gpr_pc_loongarch)
+ reg_value.SetUInt(tester->gpr.csr_era, reg_info->byte_size);
+ else if (reg == gpr_badv_loongarch)
+ reg_value.SetUInt(tester->gpr.csr_badv, reg_info->byte_size);
+ else if (reg == fpr_first_loongarch + 32)
+ // fcc0
+ reg_value.SetUInt(tester->fpr.fcc, reg_info->byte_size);
+ return true;
+ }
+
+ static bool WriteRegisterCallback(EmulateInstruction *instruction,
+ void *baton, const Context &context,
+ const RegisterInfo *reg_info,
+ const RegisterValue ®_value) {
+ LoongArch64EmulatorTester *tester =
+ (LoongArch64EmulatorTester *)instruction;
+ uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
+ if (reg >= gpr_r0_loongarch && reg <= gpr_r31_loongarch)
+ tester->gpr.gpr[reg] = reg_value.GetAsUInt64();
+ else if (reg == gpr_orig_a0_loongarch)
+ tester->gpr.orig_a0 = reg_value.GetAsUInt64();
+ else if (reg == gpr_pc_loongarch)
+ tester->gpr.csr_era = reg_value.GetAsUInt64();
+ else if (reg == gpr_badv_loongarch)
+ tester->gpr.csr_badv = reg_value.GetAsUInt64();
+ return true;
+ }
+};
+
+// BEQ BNE BLT BGE BLTU BGEU
+static uint32_t EncodeBcondType(uint32_t opcode, uint32_t rj, uint32_t rd,
+ uint32_t offs16) {
+ offs16 = offs16 & 0x0000ffff;
+ return opcode << 26 | offs16 << 10 | rj << 5 | rd;
+}
+
+static uint32_t BEQ(uint32_t rj, uint32_t rd, int32_t offs16) {
+ return EncodeBcondType(0b010110, rj, rd, uint32_t(offs16));
+}
+
+static uint32_t BNE(uint32_t rj, uint32_t rd, int32_t offs16) {
+ return EncodeBcondType(0b010111, rj, rd, uint32_t(offs16));
+}
+
+static uint32_t BLT(uint32_t rj, uint32_t rd, int32_t offs16) {
+ return EncodeBcondType(0b011000, rj, rd, uint32_t(offs16));
+}
+
+static uint32_t BGE(uint32_t rj, uint32_t rd, int32_t offs16) {
+ return EncodeBcondType(0b011001, rj, rd, uint32_t(offs16));
+}
+
+static uint32_t BLTU(uint32_t rj, uint32_t rd, int32_t offs16) {
+ return EncodeBcondType(0b011010, rj, rd, uint32_t(offs16));
+}
+
+static uint32_t BGEU(uint32_t rj, uint32_t rd, int32_t offs16) {
+ return EncodeBcondType(0b011011, rj, rd, uint32_t(offs16));
+}
+
+// BEQZ BNEZ
+static uint32_t EncodeBZcondType(uint32_t opcode, uint32_t rj,
+ uint32_t offs21) {
+ uint32_t offs20_16 = (offs21 & 0x001f0000) >> 16;
+ uint32_t offs15_0 = offs21 & 0x0000ffff;
+ return opcode << 26 | offs15_0 << 10 | rj << 5 | offs20_16;
+}
+
+static uint32_t BEQZ(uint32_t rj, int32_t offs21) {
+ return EncodeBZcondType(0b010000, rj, uint32_t(offs21));
+}
+
+static uint32_t BNEZ(uint32_t rj, int32_t offs21) {
+ return EncodeBZcondType(0b010001, rj, uint32_t(offs21));
+}
+
+using EncoderBcond = uint32_t (*)(uint32_t rj, uint32_t rd, int32_t offs16);
+using EncoderBZcond = uint32_t (*)(uint32_t rj, int32_t offs21);
+
+TEST_F(LoongArch64EmulatorTester, testJIRL) {
+ bool success = false;
+ addr_t old_pc = 0x12000600;
+ WritePC(old_pc);
+ // JIRL r1, r12, 0x10
+ // | 31 26 | 25 15 | 9 5 | 4 0 |
+ // | 0 1 0 0 1 1 | 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 | 0 1 1 0 0 | 0 0 0 0 1 |
+ uint32_t inst = 0b01001100000000000100000110000001;
+ uint32_t offs16 = 0x10;
+ gpr.gpr[12] = 0x12000400;
+ ASSERT_TRUE(TestExecute(inst));
+ auto r1 = gpr.gpr[1];
+ auto pc = ReadPC(&success);
+ ASSERT_TRUE(success);
+ ASSERT_EQ(r1, old_pc + 4);
+ ASSERT_EQ(pc, gpr.gpr[12] + (offs16 * 4));
+}
+
+TEST_F(LoongArch64EmulatorTester, testB) {
+ bool success = false;
+ addr_t old_pc = 0x12000600;
+ WritePC(old_pc);
+ // B 0x10010
+ // | 31 26 | 25 10 | 9 0 |
+ // | 0 1 0 1 0 0 | 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 | 0 0 0 0 0 0 0 0 0 1 |
+ uint32_t inst = 0b01010000000000000100000000000001;
+ uint32_t offs26 = 0x10010;
+ ASSERT_TRUE(TestExecute(inst));
+ auto pc = ReadPC(&success);
+ ASSERT_TRUE(success);
+ ASSERT_EQ(pc, old_pc + (offs26 * 4));
+}
+
+TEST_F(LoongArch64EmulatorTester, testBL) {
+ bool success = false;
+ addr_t old_pc = 0x12000600;
+ WritePC(old_pc);
+ // BL 0x10010
+ // | 31 26 | 25 10 | 9 0 |
+ // | 0 1 0 1 0 1 | 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 | 0 0 0 0 0 0 0 0 0 1 |
+ uint32_t inst = 0b01010100000000000100000000000001;
+ uint32_t offs26 = 0x10010;
+ ASSERT_TRUE(TestExecute(inst));
+ auto r1 = gpr.gpr[1];
+ auto pc = ReadPC(&success);
+ ASSERT_TRUE(success);
+ ASSERT_EQ(r1, old_pc + 4);
+ ASSERT_EQ(pc, old_pc + (offs26 * 4));
+}
+
+static void testBcondBranch(LoongArch64EmulatorTester *tester,
+ EncoderBcond encoder, bool branched,
+ uint64_t rj_val, uint64_t rd_val) {
+ bool success = false;
+ addr_t old_pc = 0x12000600;
+ tester->WritePC(old_pc);
+ tester->gpr.gpr[12] = rj_val;
+ tester->gpr.gpr[13] = rd_val;
+ // b<cmp> r12, r13, (-256)
+ uint32_t inst = encoder(12, 13, -256);
+ ASSERT_TRUE(tester->TestExecute(inst));
+ auto pc = tester->ReadPC(&success);
+ ASSERT_TRUE(success);
+ ASSERT_EQ(pc, old_pc + (branched ? (-256 * 4) : 4));
+}
+
+static void testBZcondBranch(LoongArch64EmulatorTester *tester,
+ EncoderBZcond encoder, bool branched,
+ uint64_t rj_val) {
+ bool success = false;
+ addr_t old_pc = 0x12000600;
+ tester->WritePC(old_pc);
+ tester->gpr.gpr[4] = rj_val;
+ // b<cmp>z r4, (-256)
+ uint32_t inst = encoder(4, -256);
+ ASSERT_TRUE(tester->TestExecute(inst));
+ auto pc = tester->ReadPC(&success);
+ ASSERT_TRUE(success);
+ ASSERT_EQ(pc, old_pc + (branched ? (-256 * 4) : 4));
+}
+
+GEN_BCOND_TEST(64, BEQ, 1, 1, 0)
+GEN_BCOND_TEST(64, BNE, 1, 0, 1)
+GEN_BCOND_TEST(64, BLT, -2, 1, -3)
+GEN_BCOND_TEST(64, BGE, -2, -3, 1)
+GEN_BCOND_TEST(64, BLTU, -2, -1, 1)
+GEN_BCOND_TEST(64, BGEU, -2, 1, -1)
+GEN_BZCOND_TEST(64, BEQZ, 0, 1)
+GEN_BZCOND_TEST(64, BNEZ, 1, 0)
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