[Qemu-devel] [PULL 19/28] target-mips: remove JR, BLTZAL, BGEZAL and add NAL, BAL instructions

[Leon Alrae <leon.alrae@imgtec.com>]

From: Yongbok Kim <yongbok.kim@imgtec.com>

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>
---
 disas/mips.c            |  2 ++
 target-mips/translate.c | 18 ++++++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/disas/mips.c b/disas/mips.c
index 5ebb5fd..7297825 100644
--- a/disas/mips.c
+++ b/disas/mips.c
@@ -1313,6 +1313,8 @@ const struct mips_opcode mips_builtin_opcodes[] =
 {"bgtzalc", "s,t,p",    0x1c000000, 0xffe00000, CBD|RD_s|RD_t,        0, I32R6},
 {"bltzalc", "s,t,p",    0x1c000000, 0xfc000000, CBD|RD_s|RD_t,        0, I32R6},
 {"bltuc",   "s,t,p",    0x1c000000, 0xfc000000, CBD|RD_s|RD_t,        0, I32R6},
+{"nal",     "p",        0x04100000, 0xffff0000, WR_31,                0, I32R6},
+{"bal",     "p",        0x04110000, 0xffff0000, UBD|WR_31,            0, I32R6},
 {"bc1eqz",  "T,p",      0x45200000, 0xffe00000, CBD|RD_T|FP_S|FP_D,   0, I32R6},
 {"bc1nez",  "T,p",      0x45a00000, 0xffe00000, CBD|RD_T|FP_S|FP_D,   0, I32R6},
 {"bc2eqz",  "E,p",      0x49200000, 0xffe00000, CBD|RD_C2,            0, I32R6},
diff --git a/target-mips/translate.c b/target-mips/translate.c
index 8088781..57c2d41 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -15851,6 +15851,9 @@ static void decode_opc_special_legacy(CPUMIPSState *env, DisasContext *ctx)
         gen_muldiv(ctx, op1, 0, rs, rt);
         break;
 #endif
+    case OPC_JR:
+        gen_compute_branch(ctx, op1, 4, rs, rd, sa);
+        break;
     case OPC_SPIM:
 #ifdef MIPS_STRICT_STANDARD
         MIPS_INVAL("SPIM");
@@ -15933,7 +15936,7 @@ static void decode_opc_special(CPUMIPSState *env, DisasContext *ctx)
     case OPC_XOR:
         gen_logic(ctx, op1, rd, rs, rt);
         break;
-    case OPC_JR ... OPC_JALR:
+    case OPC_JALR:
         gen_compute_branch(ctx, op1, 4, rs, rd, sa);
         break;
     case OPC_TGE ... OPC_TEQ: /* Traps */
@@ -16903,9 +16906,20 @@ static void decode_opc (CPUMIPSState *env, DisasContext *ctx)
             check_insn_opc_removed(ctx, ISA_MIPS32R6);
         case OPC_BLTZ:
         case OPC_BGEZ:
+            gen_compute_branch(ctx, op1, 4, rs, -1, imm << 2);
+            break;
         case OPC_BLTZAL:
         case OPC_BGEZAL:
-            gen_compute_branch(ctx, op1, 4, rs, -1, imm << 2);
+            if (ctx->insn_flags & ISA_MIPS32R6) {
+                if (rs == 0) {
+                    /* OPC_NAL, OPC_BAL */
+                    gen_compute_branch(ctx, op1, 4, 0, -1, imm << 2);
+                } else {
+                    generate_exception(ctx, EXCP_RI);
+                }
+            } else {
+                gen_compute_branch(ctx, op1, 4, rs, -1, imm << 2);
+            }
             break;
         case OPC_TGEI ... OPC_TEQI: /* REGIMM traps */
         case OPC_TNEI:
-- 
2.1.0