summary refs log tree commit diff stats
path: root/target/loongarch/tcg/translate.c
diff options
context:
space:
mode:
Diffstat (limited to 'target/loongarch/tcg/translate.c')
-rw-r--r--target/loongarch/tcg/translate.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/target/loongarch/tcg/translate.c b/target/loongarch/tcg/translate.c
new file mode 100644
index 0000000000..21f4db6fbd
--- /dev/null
+++ b/target/loongarch/tcg/translate.c
@@ -0,0 +1,370 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch emulation for QEMU - main translation routines.
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "tcg/tcg-op.h"
+#include "tcg/tcg-op-gvec.h"
+#include "exec/translation-block.h"
+#include "exec/translator.h"
+#include "exec/helper-proto.h"
+#include "exec/helper-gen.h"
+#include "exec/log.h"
+#include "qemu/qemu-print.h"
+#include "fpu/softfloat.h"
+#include "translate.h"
+#include "internals.h"
+#include "vec.h"
+
+/* Global register indices */
+TCGv cpu_gpr[32], cpu_pc;
+static TCGv cpu_lladdr, cpu_llval;
+
+#define HELPER_H "helper.h"
+#include "exec/helper-info.c.inc"
+#undef  HELPER_H
+
+#define DISAS_STOP        DISAS_TARGET_0
+#define DISAS_EXIT        DISAS_TARGET_1
+#define DISAS_EXIT_UPDATE DISAS_TARGET_2
+
+static inline int vec_full_offset(int regno)
+{
+    return  offsetof(CPULoongArchState, fpr[regno]);
+}
+
+static inline int vec_reg_offset(int regno, int index, MemOp mop)
+{
+    const uint8_t size = 1 << mop;
+    int offs = index * size;
+
+    if (HOST_BIG_ENDIAN && size < 8 ) {
+        offs ^= (8 - size);
+    }
+
+    return offs + vec_full_offset(regno);
+}
+
+static inline void get_vreg64(TCGv_i64 dest, int regno, int index)
+{
+    tcg_gen_ld_i64(dest, tcg_env,
+                   offsetof(CPULoongArchState, fpr[regno].vreg.D(index)));
+}
+
+static inline void set_vreg64(TCGv_i64 src, int regno, int index)
+{
+    tcg_gen_st_i64(src, tcg_env,
+                   offsetof(CPULoongArchState, fpr[regno].vreg.D(index)));
+}
+
+static inline int plus_1(DisasContext *ctx, int x)
+{
+    return x + 1;
+}
+
+static inline int shl_1(DisasContext *ctx, int x)
+{
+    return x << 1;
+}
+
+static inline int shl_2(DisasContext *ctx, int x)
+{
+    return x << 2;
+}
+
+static inline int shl_3(DisasContext *ctx, int x)
+{
+    return x << 3;
+}
+
+/*
+ * LoongArch the upper 32 bits are undefined ("can be any value").
+ * QEMU chooses to nanbox, because it is most likely to show guest bugs early.
+ */
+static void gen_nanbox_s(TCGv_i64 out, TCGv_i64 in)
+{
+    tcg_gen_ori_i64(out, in, MAKE_64BIT_MASK(32, 32));
+}
+
+void generate_exception(DisasContext *ctx, int excp)
+{
+    tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
+    gen_helper_raise_exception(tcg_env, tcg_constant_i32(excp));
+    ctx->base.is_jmp = DISAS_NORETURN;
+}
+
+static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
+{
+    if (ctx->va32) {
+        dest = (uint32_t) dest;
+    }
+
+    if (translator_use_goto_tb(&ctx->base, dest)) {
+        tcg_gen_goto_tb(n);
+        tcg_gen_movi_tl(cpu_pc, dest);
+        tcg_gen_exit_tb(ctx->base.tb, n);
+    } else {
+        tcg_gen_movi_tl(cpu_pc, dest);
+        tcg_gen_lookup_and_goto_ptr();
+    }
+}
+
+static void loongarch_tr_init_disas_context(DisasContextBase *dcbase,
+                                            CPUState *cs)
+{
+    int64_t bound;
+    CPULoongArchState *env = cpu_env(cs);
+    DisasContext *ctx = container_of(dcbase, DisasContext, base);
+
+    ctx->page_start = ctx->base.pc_first & TARGET_PAGE_MASK;
+    ctx->plv = ctx->base.tb->flags & HW_FLAGS_PLV_MASK;
+    if (ctx->base.tb->flags & HW_FLAGS_CRMD_PG) {
+        ctx->mem_idx = ctx->plv;
+    } else {
+        ctx->mem_idx = MMU_IDX_DA;
+    }
+
+    /* Bound the number of insns to execute to those left on the page.  */
+    bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4;
+    ctx->base.max_insns = MIN(ctx->base.max_insns, bound);
+
+    if (FIELD_EX64(env->cpucfg[2], CPUCFG2, LSX)) {
+        ctx->vl = LSX_LEN;
+    }
+
+    if (FIELD_EX64(env->cpucfg[2], CPUCFG2, LASX)) {
+        ctx->vl = LASX_LEN;
+    }
+
+    ctx->la64 = is_la64(env);
+    ctx->va32 = (ctx->base.tb->flags & HW_FLAGS_VA32) != 0;
+
+    ctx->zero = tcg_constant_tl(0);
+
+    ctx->cpucfg1 = env->cpucfg[1];
+    ctx->cpucfg2 = env->cpucfg[2];
+}
+
+static void loongarch_tr_tb_start(DisasContextBase *dcbase, CPUState *cs)
+{
+}
+
+static void loongarch_tr_insn_start(DisasContextBase *dcbase, CPUState *cs)
+{
+    DisasContext *ctx = container_of(dcbase, DisasContext, base);
+
+    tcg_gen_insn_start(ctx->base.pc_next);
+}
+
+/*
+ * Wrappers for getting reg values.
+ *
+ * The $zero register does not have cpu_gpr[0] allocated -- we supply the
+ * constant zero as a source, and an uninitialized sink as destination.
+ *
+ * Further, we may provide an extension for word operations.
+ */
+static TCGv gpr_src(DisasContext *ctx, int reg_num, DisasExtend src_ext)
+{
+    TCGv t;
+
+    if (reg_num == 0) {
+        return ctx->zero;
+    }
+
+    switch (src_ext) {
+    case EXT_NONE:
+        return cpu_gpr[reg_num];
+    case EXT_SIGN:
+        t = tcg_temp_new();
+        tcg_gen_ext32s_tl(t, cpu_gpr[reg_num]);
+        return t;
+    case EXT_ZERO:
+        t = tcg_temp_new();
+        tcg_gen_ext32u_tl(t, cpu_gpr[reg_num]);
+        return t;
+    }
+    g_assert_not_reached();
+}
+
+static TCGv gpr_dst(DisasContext *ctx, int reg_num, DisasExtend dst_ext)
+{
+    if (reg_num == 0 || dst_ext) {
+        return tcg_temp_new();
+    }
+    return cpu_gpr[reg_num];
+}
+
+static void gen_set_gpr(int reg_num, TCGv t, DisasExtend dst_ext)
+{
+    if (reg_num != 0) {
+        switch (dst_ext) {
+        case EXT_NONE:
+            tcg_gen_mov_tl(cpu_gpr[reg_num], t);
+            break;
+        case EXT_SIGN:
+            tcg_gen_ext32s_tl(cpu_gpr[reg_num], t);
+            break;
+        case EXT_ZERO:
+            tcg_gen_ext32u_tl(cpu_gpr[reg_num], t);
+            break;
+        default:
+            g_assert_not_reached();
+        }
+    }
+}
+
+static TCGv get_fpr(DisasContext *ctx, int reg_num)
+{
+    TCGv t = tcg_temp_new();
+    tcg_gen_ld_i64(t, tcg_env,
+                   offsetof(CPULoongArchState, fpr[reg_num].vreg.D(0)));
+    return  t;
+}
+
+static void set_fpr(int reg_num, TCGv val)
+{
+    tcg_gen_st_i64(val, tcg_env,
+                   offsetof(CPULoongArchState, fpr[reg_num].vreg.D(0)));
+}
+
+static TCGv make_address_x(DisasContext *ctx, TCGv base, TCGv addend)
+{
+    TCGv temp = NULL;
+
+    if (addend || ctx->va32) {
+        temp = tcg_temp_new();
+    }
+    if (addend) {
+        tcg_gen_add_tl(temp, base, addend);
+        base = temp;
+    }
+    if (ctx->va32) {
+        tcg_gen_ext32u_tl(temp, base);
+        base = temp;
+    }
+    return base;
+}
+
+static TCGv make_address_i(DisasContext *ctx, TCGv base, target_long ofs)
+{
+    TCGv addend = ofs ? tcg_constant_tl(ofs) : NULL;
+    return make_address_x(ctx, base, addend);
+}
+
+static uint64_t make_address_pc(DisasContext *ctx, uint64_t addr)
+{
+    if (ctx->va32) {
+        addr = (int32_t)addr;
+    }
+    return addr;
+}
+
+#include "decode-insns.c.inc"
+#include "insn_trans/trans_arith.c.inc"
+#include "insn_trans/trans_shift.c.inc"
+#include "insn_trans/trans_bit.c.inc"
+#include "insn_trans/trans_memory.c.inc"
+#include "insn_trans/trans_atomic.c.inc"
+#include "insn_trans/trans_extra.c.inc"
+#include "insn_trans/trans_farith.c.inc"
+#include "insn_trans/trans_fcmp.c.inc"
+#include "insn_trans/trans_fcnv.c.inc"
+#include "insn_trans/trans_fmov.c.inc"
+#include "insn_trans/trans_fmemory.c.inc"
+#include "insn_trans/trans_branch.c.inc"
+#include "insn_trans/trans_privileged.c.inc"
+#include "insn_trans/trans_vec.c.inc"
+
+static void loongarch_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
+{
+    CPULoongArchState *env = cpu_env(cs);
+    DisasContext *ctx = container_of(dcbase, DisasContext, base);
+
+    ctx->opcode = translator_ldl(env, &ctx->base, ctx->base.pc_next);
+
+    if (!decode(ctx, ctx->opcode)) {
+        qemu_log_mask(LOG_UNIMP, "Error: unknown opcode. "
+                      TARGET_FMT_lx ": 0x%x\n",
+                      ctx->base.pc_next, ctx->opcode);
+        generate_exception(ctx, EXCCODE_INE);
+    }
+
+    ctx->base.pc_next += 4;
+
+    if (ctx->va32) {
+        ctx->base.pc_next = (uint32_t)ctx->base.pc_next;
+    }
+}
+
+static void loongarch_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
+{
+    DisasContext *ctx = container_of(dcbase, DisasContext, base);
+
+    switch (ctx->base.is_jmp) {
+    case DISAS_STOP:
+        tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
+        tcg_gen_lookup_and_goto_ptr();
+        break;
+    case DISAS_TOO_MANY:
+        gen_goto_tb(ctx, 0, ctx->base.pc_next);
+        break;
+    case DISAS_NORETURN:
+        break;
+    case DISAS_EXIT_UPDATE:
+        tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
+        QEMU_FALLTHROUGH;
+    case DISAS_EXIT:
+        tcg_gen_exit_tb(NULL, 0);
+        break;
+    default:
+        g_assert_not_reached();
+    }
+}
+
+static void loongarch_tr_disas_log(const DisasContextBase *dcbase,
+                                   CPUState *cpu, FILE *logfile)
+{
+    qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first));
+    target_disas(logfile, cpu, dcbase->pc_first, dcbase->tb->size);
+}
+
+static const TranslatorOps loongarch_tr_ops = {
+    .init_disas_context = loongarch_tr_init_disas_context,
+    .tb_start           = loongarch_tr_tb_start,
+    .insn_start         = loongarch_tr_insn_start,
+    .translate_insn     = loongarch_tr_translate_insn,
+    .tb_stop            = loongarch_tr_tb_stop,
+    .disas_log          = loongarch_tr_disas_log,
+};
+
+void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int *max_insns,
+                           target_ulong pc, void *host_pc)
+{
+    DisasContext ctx;
+
+    translator_loop(cs, tb, max_insns, pc, host_pc,
+                    &loongarch_tr_ops, &ctx.base);
+}
+
+void loongarch_translate_init(void)
+{
+    int i;
+
+    cpu_gpr[0] = NULL;
+    for (i = 1; i < 32; i++) {
+        cpu_gpr[i] = tcg_global_mem_new(tcg_env,
+                                        offsetof(CPULoongArchState, gpr[i]),
+                                        regnames[i]);
+    }
+
+    cpu_pc = tcg_global_mem_new(tcg_env, offsetof(CPULoongArchState, pc), "pc");
+    cpu_lladdr = tcg_global_mem_new(tcg_env,
+                    offsetof(CPULoongArchState, lladdr), "lladdr");
+    cpu_llval = tcg_global_mem_new(tcg_env,
+                    offsetof(CPULoongArchState, llval), "llval");
+}