[Qemu-devel] [PATCH v7 04/14] target-mips-ase-dsp: Add branch instructions

[Jia Liu]

Add MIPS ASE DSP Branch instructions.

Signed-off-by: Jia Liu <pro...@gmail.com>
---
 target-mips/translate.c |   50 +++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 4 deletions(-)

diff --git a/target-mips/translate.c b/target-mips/translate.c
index e1ea9c1..18d827d 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -332,6 +332,14 @@ enum {
     OPC_DSHD     = (0x05 << 6) | OPC_DBSHFL,
 };
 
+/* MIPS DSP REGIMM opcodes */
+enum {
+    OPC_BPOSGE32 = (0x1C << 16) | OPC_REGIMM,
+#if defined(TARGET_MIPS64)
+    OPC_BPOSGE64 = (0x1D << 16) | OPC_REGIMM,
+#endif
+};
+
 /* Coprocessor 0 (rs field) */
 #define MASK_CP0(op)       MASK_OP_MAJOR(op) | (op & (0x1F << 21))
 
@@ -2841,6 +2849,22 @@ static void gen_compute_branch (DisasContext *ctx, 
uint32_t opc,
         }
         btgt = ctx->pc + insn_bytes + offset;
         break;
+    case OPC_BPOSGE32:
+#if defined(TARGET_MIPS64)
+        tcg_gen_andi_tl(t0, cpu_dspctrl, 0x7F);
+#else
+        tcg_gen_andi_tl(t0, cpu_dspctrl, 0x3F);
+#endif
+        bcond_compute = 1;
+        btgt = ctx->pc + insn_bytes + offset;
+        break;
+#if defined(TARGET_MIPS64)
+    case OPC_BPOSGE64:
+        tcg_gen_andi_tl(t0, cpu_dspctrl, 0x7F);
+        bcond_compute = 1;
+        btgt = ctx->pc + insn_bytes + offset;
+        break;
+#endif
     case OPC_J:
     case OPC_JAL:
     case OPC_JALX:
@@ -3029,6 +3053,16 @@ static void gen_compute_branch (DisasContext *ctx, 
uint32_t opc,
             tcg_gen_setcondi_tl(TCG_COND_LT, bcond, t0, 0);
             MIPS_DEBUG("bltzl %s, " TARGET_FMT_lx, regnames[rs], btgt);
             goto likely;
+        case OPC_BPOSGE32:
+            tcg_gen_setcondi_tl(TCG_COND_GE, bcond, t0, 32);
+            MIPS_DEBUG("bposge32 %s, " TARGET_FMT_lx, t0, btgt);
+            goto not_likely;
+#if defined(TARGET_MIPS64)
+        case OPC_BPOSGE64:
+            tcg_gen_setcondi_tl(TCG_COND_GE, bcond, t0, 64);
+            MIPS_DEBUG("bposge64 %s, " TARGET_FMT_lx, t0, btgt);
+            goto not_likely;
+#endif
         case OPC_BLTZALS:
         case OPC_BLTZAL:
             ctx->hflags |= (opc == OPC_BLTZALS
@@ -11284,10 +11318,6 @@ static void decode_micromips32_opc (CPUMIPSState *env, 
DisasContext *ctx,
                                 (ctx->opcode >> 18) & 0x7, imm << 1);
             *is_branch = 1;
             break;
-        case BPOSGE64:
-        case BPOSGE32:
-            /* MIPS DSP: not implemented */
-            /* Fall through */
         default:
             MIPS_INVAL("pool32i");
             generate_exception(ctx, EXCP_RI);
@@ -12196,6 +12226,18 @@ static void decode_opc (CPUMIPSState *env, 
DisasContext *ctx, int *is_branch)
             check_insn(env, ctx, ISA_MIPS32R2);
             /* Treat as NOP. */
             break;
+        case OPC_BPOSGE32:    /* MIPS DSP branch */
+            check_dsp(ctx);
+            gen_compute_branch(ctx, op1, 4, -1, -2, (int32_t)imm << 2);
+            *is_branch = 1;
+            break;
+#if defined(TARGET_MIPS64)
+        case OPC_BPOSGE64:
+            check_dsp(ctx);
+            gen_compute_branch(ctx, op1, 4, -1, -2, (int32_t)imm << 2);
+            *is_branch = 1;
+            break;
+#endif
         default:            /* Invalid */
             MIPS_INVAL("regimm");
             generate_exception(ctx, EXCP_RI);
-- 
1.7.9.5