[Qemu-devel] [PULL 3/9] target-tricore: Add instructions of BRN opcode format

[Bastian Koppelmann <kbastian@mail.uni-paderborn.de>]

Add instructions of BRN opcode format.
Add MASK_OP_BRN_DISP15_SEXT.

Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 target-tricore/translate.c       | 26 ++++++++++++++++++++++++++
 target-tricore/tricore-opcodes.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/target-tricore/translate.c b/target-tricore/translate.c
index 789f005..428a41e 100644
--- a/target-tricore/translate.c
+++ b/target-tricore/translate.c
@@ -568,6 +568,7 @@ static void gen_compute_branch(DisasContext *ctx, uint32_t opc, int r1,
                                int r2 , int32_t constant , int32_t offset)
 {
     TCGv temp;
+    int n;
 
     switch (opc) {
 /* SB-format jumps */
@@ -706,6 +707,20 @@ static void gen_compute_branch(DisasContext *ctx, uint32_t opc, int r1,
         }
         tcg_temp_free(temp);
         break;
+/* BRN format */
+    case OPCM_32_BRN_JTT:
+        n = MASK_OP_BRN_N(ctx->opcode);
+
+        temp = tcg_temp_new();
+        tcg_gen_andi_tl(temp, cpu_gpr_d[r1], (1 << n));
+
+        if (MASK_OP_BRN_OP2(ctx->opcode) == OPC2_32_BRN_JNZ_T) {
+            gen_branch_condi(ctx, TCG_COND_NE, temp, 0, offset);
+        } else {
+            gen_branch_condi(ctx, TCG_COND_EQ, temp, 0, offset);
+        }
+        tcg_temp_free(temp);
+        break;
     default:
         printf("Branch Error at %x\n", ctx->pc);
     }
@@ -2371,6 +2386,11 @@ static void decode_32Bit_opc(CPUTriCoreState *env, DisasContext *ctx)
 
     op1 = MASK_OP_MAJOR(ctx->opcode);
 
+    /* handle JNZ.T opcode only being 6 bit long */
+    if (unlikely((op1 & 0x3f) == OPCM_32_BRN_JTT)) {
+        op1 = OPCM_32_BRN_JTT;
+    }
+
     switch (op1) {
 /* ABS-format */
     case OPCM_32_ABS_LDW:
@@ -2504,6 +2524,12 @@ static void decode_32Bit_opc(CPUTriCoreState *env, DisasContext *ctx)
         r1 = MASK_OP_BRC_S1(ctx->opcode);
         gen_compute_branch(ctx, op1, r1, 0, const4, address);
         break;
+/* BRN Format */
+    case OPCM_32_BRN_JTT:
+        address = MASK_OP_BRN_DISP15_SEXT(ctx->opcode);
+        r1 = MASK_OP_BRN_S1(ctx->opcode);
+        gen_compute_branch(ctx, op1, r1, 0, 0, address);
+        break;
     }
 }
 
diff --git a/target-tricore/tricore-opcodes.h b/target-tricore/tricore-opcodes.h
index 2d18624..3622d38 100644
--- a/target-tricore/tricore-opcodes.h
+++ b/target-tricore/tricore-opcodes.h
@@ -132,6 +132,7 @@
 /* BRN Format */
 #define MASK_OP_BRN_OP2(op)    MASK_BITS_SHIFT(op, 31, 31)
 #define MASK_OP_BRN_DISP15(op) MASK_BITS_SHIFT(op, 16, 30)
+#define MASK_OP_BRN_DISP15_SEXT(op) MASK_BITS_SHIFT_SEXT(op, 16, 30)
 #define MASK_OP_BRN_N(op)      (MASK_BITS_SHIFT(op, 12, 15) + \
                                (MASK_BITS_SHIFT(op, 7, 7) << 4))
 #define MASK_OP_BRN_S1(op)     MASK_BITS_SHIFT(op, 8, 11)
-- 
2.1.3