target-mips: add ALIGN, DALIGN, BITSWAP and DBITSWAP instructions

Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 108 insertions, 12 deletions

diff --git a/target-mips/translate.c b/target-mips/translate.c
index 74204850a4..0052e24617 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -392,17 +392,23 @@ enum {
 #define MASK_BSHFL(op)     MASK_SPECIAL3(op) | (op & (0x1F << 6))
 
 enum {
-    OPC_WSBH     = (0x02 << 6) | OPC_BSHFL,
-    OPC_SEB      = (0x10 << 6) | OPC_BSHFL,
-    OPC_SEH      = (0x18 << 6) | OPC_BSHFL,
+    OPC_WSBH      = (0x02 << 6) | OPC_BSHFL,
+    OPC_SEB       = (0x10 << 6) | OPC_BSHFL,
+    OPC_SEH       = (0x18 << 6) | OPC_BSHFL,
+    OPC_ALIGN     = (0x08 << 6) | OPC_BSHFL, /* 010.bp */
+    OPC_ALIGN_END = (0x0B << 6) | OPC_BSHFL, /* 010.00 to 010.11 */
+    OPC_BITSWAP   = (0x00 << 6) | OPC_BSHFL  /* 00000 */
 };
 
 /* DBSHFL opcodes */
 #define MASK_DBSHFL(op)    MASK_SPECIAL3(op) | (op & (0x1F << 6))
 
 enum {
-    OPC_DSBH     = (0x02 << 6) | OPC_DBSHFL,
-    OPC_DSHD     = (0x05 << 6) | OPC_DBSHFL,
+    OPC_DSBH       = (0x02 << 6) | OPC_DBSHFL,
+    OPC_DSHD       = (0x05 << 6) | OPC_DBSHFL,
+    OPC_DALIGN     = (0x08 << 6) | OPC_DBSHFL, /* 01.bp */
+    OPC_DALIGN_END = (0x0F << 6) | OPC_DBSHFL, /* 01.000 to 01.111 */
+    OPC_DBITSWAP   = (0x00 << 6) | OPC_DBSHFL, /* 00000 */
 };
 
 /* MIPS DSP REGIMM opcodes */
@@ -15162,12 +15168,14 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
 
 static void decode_opc_special3_r6(CPUMIPSState *env, DisasContext *ctx)
 {
-    int rs, rt;
-    uint32_t op1;
+    int rs, rt, rd, sa;
+    uint32_t op1, op2;
     int16_t imm;
 
     rs = (ctx->opcode >> 21) & 0x1f;
     rt = (ctx->opcode >> 16) & 0x1f;
+    rd = (ctx->opcode >> 11) & 0x1f;
+    sa = (ctx->opcode >> 6) & 0x1f;
     imm = (int16_t)ctx->opcode >> 7;
 
     op1 = MASK_SPECIAL3(ctx->opcode);
@@ -15188,6 +15196,43 @@ static void decode_opc_special3_r6(CPUMIPSState *env, DisasContext *ctx)
     case R6_OPC_LL:
         gen_ld(ctx, op1, rt, rs, imm);
         break;
+    case OPC_BSHFL:
+        {
+            if (rd == 0) {
+                /* Treat as NOP. */
+                break;
+            }
+            TCGv t0 = tcg_temp_new();
+            gen_load_gpr(t0, rt);
+
+            op2 = MASK_BSHFL(ctx->opcode);
+            switch (op2) {
+            case OPC_ALIGN ... OPC_ALIGN_END:
+                sa &= 3;
+                if (sa == 0) {
+                    tcg_gen_mov_tl(cpu_gpr[rd], t0);
+                } else {
+                    TCGv t1 = tcg_temp_new();
+                    TCGv_i64 t2 = tcg_temp_new_i64();
+                    gen_load_gpr(t1, rs);
+                    tcg_gen_concat_tl_i64(t2, t1, t0);
+                    tcg_gen_shri_i64(t2, t2, 8 * (4 - sa));
+#if defined(TARGET_MIPS64)
+                    tcg_gen_ext32s_i64(cpu_gpr[rd], t2);
+#else
+                    tcg_gen_trunc_i64_i32(cpu_gpr[rd], t2);
+#endif
+                    tcg_temp_free_i64(t2);
+                    tcg_temp_free(t1);
+                }
+                break;
+            case OPC_BITSWAP:
+                gen_helper_bitswap(cpu_gpr[rd], t0);
+                break;
+            }
+            tcg_temp_free(t0);
+        }
+        break;
 #if defined(TARGET_MIPS64)
     case R6_OPC_SCD:
         gen_st_cond(ctx, op1, rt, rs, imm);
@@ -15195,6 +15240,38 @@ static void decode_opc_special3_r6(CPUMIPSState *env, DisasContext *ctx)
     case R6_OPC_LLD:
         gen_ld(ctx, op1, rt, rs, imm);
         break;
+    case OPC_DBSHFL:
+        check_mips_64(ctx);
+        {
+            if (rd == 0) {
+                /* Treat as NOP. */
+                break;
+            }
+            TCGv t0 = tcg_temp_new();
+            gen_load_gpr(t0, rt);
+
+            op2 = MASK_DBSHFL(ctx->opcode);
+            switch (op2) {
+            case OPC_DALIGN ... OPC_DALIGN_END:
+                sa &= 7;
+                if (sa == 0) {
+                    tcg_gen_mov_tl(cpu_gpr[rd], t0);
+                } else {
+                    TCGv t1 = tcg_temp_new();
+                    gen_load_gpr(t1, rs);
+                    tcg_gen_shli_tl(t0, t0, 8 * sa);
+                    tcg_gen_shri_tl(t1, t1, 8 * (8 - sa));
+                    tcg_gen_or_tl(cpu_gpr[rd], t1, t0);
+                    tcg_temp_free(t1);
+                }
+                break;
+            case OPC_DBITSWAP:
+                gen_helper_dbitswap(cpu_gpr[rd], t0);
+                break;
+            }
+            tcg_temp_free(t0);
+        }
+        break;
 #endif
     default:            /* Invalid */
         MIPS_INVAL("special3_r6");
@@ -15743,9 +15820,18 @@ static void decode_opc_special3(CPUMIPSState *env, DisasContext *ctx)
         gen_bitops(ctx, op1, rt, rs, sa, rd);
         break;
     case OPC_BSHFL:
-        check_insn(ctx, ISA_MIPS32R2);
         op2 = MASK_BSHFL(ctx->opcode);
-        gen_bshfl(ctx, op2, rt, rd);
+        switch (op2) {
+        case OPC_ALIGN ... OPC_ALIGN_END:
+        case OPC_BITSWAP:
+            check_insn(ctx, ISA_MIPS32R6);
+            decode_opc_special3_r6(env, ctx);
+            break;
+        default:
+            check_insn(ctx, ISA_MIPS32R2);
+            gen_bshfl(ctx, op2, rt, rd);
+            break;
+        }
         break;
 #if defined(TARGET_MIPS64)
     case OPC_DEXTM ... OPC_DEXT:
@@ -15755,10 +15841,20 @@ static void decode_opc_special3(CPUMIPSState *env, DisasContext *ctx)
         gen_bitops(ctx, op1, rt, rs, sa, rd);
         break;
     case OPC_DBSHFL:
-        check_insn(ctx, ISA_MIPS64R2);
-        check_mips_64(ctx);
         op2 = MASK_DBSHFL(ctx->opcode);
-        gen_bshfl(ctx, op2, rt, rd);
+        switch (op2) {
+        case OPC_DALIGN ... OPC_DALIGN_END:
+        case OPC_DBITSWAP:
+            check_insn(ctx, ISA_MIPS32R6);
+            decode_opc_special3_r6(env, ctx);
+            break;
+        default:
+            check_insn(ctx, ISA_MIPS64R2);
+            check_mips_64(ctx);
+            op2 = MASK_DBSHFL(ctx->opcode);
+            gen_bshfl(ctx, op2, rt, rd);
+            break;
+        }
         break;
 #endif
     case OPC_RDHWR: