1 files changed, 140 insertions, 0 deletions
diff --git a/target/loongarch/tcg/op_helper.c b/target/loongarch/tcg/op_helper.c
new file mode 100644
index 0000000000..fe79c62fa4
--- /dev/null
+++ b/target/loongarch/tcg/op_helper.c
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch emulation helpers for QEMU.
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "cpu.h"
+#include "qemu/host-utils.h"
+#include "exec/helper-proto.h"
+#include "exec/exec-all.h"
+#include "exec/cpu_ldst.h"
+#include "internals.h"
+#include "qemu/crc32c.h"
+#include <zlib.h>
+#include "cpu-csr.h"
+
+/* Exceptions helpers */
+void helper_raise_exception(CPULoongArchState *env, uint32_t exception)
+{
+    do_raise_exception(env, exception, GETPC());
+}
+
+target_ulong helper_bitrev_w(target_ulong rj)
+{
+    return (int32_t)revbit32(rj);
+}
+
+target_ulong helper_bitrev_d(target_ulong rj)
+{
+    return revbit64(rj);
+}
+
+target_ulong helper_bitswap(target_ulong v)
+{
+    v = ((v >> 1) & (target_ulong)0x5555555555555555ULL) |
+        ((v & (target_ulong)0x5555555555555555ULL) << 1);
+    v = ((v >> 2) & (target_ulong)0x3333333333333333ULL) |
+        ((v & (target_ulong)0x3333333333333333ULL) << 2);
+    v = ((v >> 4) & (target_ulong)0x0F0F0F0F0F0F0F0FULL) |
+        ((v & (target_ulong)0x0F0F0F0F0F0F0F0FULL) << 4);
+    return v;
+}
+
+/* loongarch assert op */
+void helper_asrtle_d(CPULoongArchState *env, target_ulong rj, target_ulong rk)
+{
+    if (rj > rk) {
+        env->CSR_BADV = rj;
+        do_raise_exception(env, EXCCODE_BCE, GETPC());
+    }
+}
+
+void helper_asrtgt_d(CPULoongArchState *env, target_ulong rj, target_ulong rk)
+{
+    if (rj <= rk) {
+        env->CSR_BADV = rj;
+        do_raise_exception(env, EXCCODE_BCE, GETPC());
+    }
+}
+
+target_ulong helper_crc32(target_ulong val, target_ulong m, uint64_t sz)
+{
+    uint8_t buf[8];
+    target_ulong mask = ((sz * 8) == 64) ? -1ULL : ((1ULL << (sz * 8)) - 1);
+
+    m &= mask;
+    stq_le_p(buf, m);
+    return (int32_t) (crc32(val ^ 0xffffffff, buf, sz) ^ 0xffffffff);
+}
+
+target_ulong helper_crc32c(target_ulong val, target_ulong m, uint64_t sz)
+{
+    uint8_t buf[8];
+    target_ulong mask = ((sz * 8) == 64) ? -1ULL : ((1ULL << (sz * 8)) - 1);
+    m &= mask;
+    stq_le_p(buf, m);
+    return (int32_t) (crc32c(val, buf, sz) ^ 0xffffffff);
+}
+
+target_ulong helper_cpucfg(CPULoongArchState *env, target_ulong rj)
+{
+    return rj >= ARRAY_SIZE(env->cpucfg) ? 0 : env->cpucfg[rj];
+}
+
+uint64_t helper_rdtime_d(CPULoongArchState *env)
+{
+#ifdef CONFIG_USER_ONLY
+    return cpu_get_host_ticks();
+#else
+    uint64_t plv;
+    LoongArchCPU *cpu = env_archcpu(env);
+
+    plv = FIELD_EX64(env->CSR_CRMD, CSR_CRMD, PLV);
+    if (extract64(env->CSR_MISC, R_CSR_MISC_DRDTL_SHIFT + plv, 1)) {
+        do_raise_exception(env, EXCCODE_IPE, GETPC());
+    }
+
+    return cpu_loongarch_get_constant_timer_counter(cpu);
+#endif
+}
+
+#ifndef CONFIG_USER_ONLY
+void helper_ertn(CPULoongArchState *env)
+{
+    uint64_t csr_pplv, csr_pie;
+    if (FIELD_EX64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR)) {
+        csr_pplv = FIELD_EX64(env->CSR_TLBRPRMD, CSR_TLBRPRMD, PPLV);
+        csr_pie = FIELD_EX64(env->CSR_TLBRPRMD, CSR_TLBRPRMD, PIE);
+
+        env->CSR_TLBRERA = FIELD_DP64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR, 0);
+        env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, DA, 0);
+        env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, PG, 1);
+        set_pc(env, env->CSR_TLBRERA);
+        qemu_log_mask(CPU_LOG_INT, "%s: TLBRERA " TARGET_FMT_lx "\n",
+                      __func__, env->CSR_TLBRERA);
+    } else {
+        csr_pplv = FIELD_EX64(env->CSR_PRMD, CSR_PRMD, PPLV);
+        csr_pie = FIELD_EX64(env->CSR_PRMD, CSR_PRMD, PIE);
+
+        set_pc(env, env->CSR_ERA);
+        qemu_log_mask(CPU_LOG_INT, "%s: ERA " TARGET_FMT_lx "\n",
+                      __func__, env->CSR_ERA);
+    }
+    env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, PLV, csr_pplv);
+    env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, IE, csr_pie);
+
+    env->lladdr = 1;
+}
+
+void helper_idle(CPULoongArchState *env)
+{
+    CPUState *cs = env_cpu(env);
+
+    cs->halted = 1;
+    do_raise_exception(env, EXCP_HLT, 0);
+}
+#endif