[PATCH 1/4] target/mips: Legalize Loongson insn flags

[Jiaxun Yang]

To match the actual status of Loongson insn, we split flags
for LMMI and LEXT from INSN_LOONGSON2F.

As Loongson-2F only implemented interger part of LEXT, we'll
not enable LEXT for the processor, but instead we're still using
INSN_LOONGSON2F as switch flag of these instructions.

All multimedia instructions have been moved to LMMI flag. Loongson-2F
and Loongson-3A are sharing these instructions.

Signed-off-by: Jiaxun Yang <jiaxun.y...@flygoat.com>
---
 target/mips/mips-defs.h |  4 ++--
 target/mips/translate.c | 13 +++++++------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/target/mips/mips-defs.h b/target/mips/mips-defs.h
index 0c129106c8..f1b833f947 100644
--- a/target/mips/mips-defs.h
+++ b/target/mips/mips-defs.h
@@ -70,7 +70,7 @@
 #define CPU_VR54XX      (CPU_MIPS4 | INSN_VR54XX)
 #define CPU_R5900       (CPU_MIPS3 | INSN_R5900)
 #define CPU_LOONGSON2E  (CPU_MIPS3 | INSN_LOONGSON2E)
-#define CPU_LOONGSON2F  (CPU_MIPS3 | INSN_LOONGSON2F)
+#define CPU_LOONGSON2F  (CPU_MIPS3 | INSN_LOONGSON2F | ASE_LMMI)
 
 #define CPU_MIPS5       (CPU_MIPS4 | ISA_MIPS5)
 
@@ -97,7 +97,7 @@
 /* Wave Computing: "nanoMIPS" */
 #define CPU_NANOMIPS32  (CPU_MIPS32R6 | ISA_NANOMIPS32)
 
-#define CPU_LOONGSON3A  (CPU_MIPS64R2 | INSN_LOONGSON3A)
+#define CPU_LOONGSON3A  (CPU_MIPS64R2 | INSN_LOONGSON3A | ASE_LMMI | ASE_LEXT)
 
 /*
  * Strictly follow the architecture standard:
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 2caf4cba5a..e49f32f6ae 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -1046,7 +1046,7 @@ enum {
     OPC_BC2NEZ  = (0x0D << 21) | OPC_CP2,
 };
 
-#define MASK_LMI(op)    (MASK_OP_MAJOR(op) | (op & (0x1F << 21)) | (op & 0x1F))
+#define MASK_LMMI(op)    (MASK_OP_MAJOR(op) | (op & (0x1F << 21)) | (op & 
0x1F))
 
 enum {
     OPC_PADDSH      = (24 << 21) | (0x00) | OPC_CP2,
@@ -3421,7 +3421,8 @@ static void gen_ld(DisasContext *ctx, uint32_t opc,
     TCGv t0, t1, t2;
     int mem_idx = ctx->mem_idx;
 
-    if (rt == 0 && ctx->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)) {
+    if (rt == 0 && ctx->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F |
+                                      INSN_LOONGSON3A)) {
         /*
          * Loongson CPU uses a load to zero register for prefetch.
          * We emulate it as a NOP. On other CPU we must perform the
@@ -5531,7 +5532,7 @@ static void gen_loongson_multimedia(DisasContext *ctx, 
int rd, int rs, int rt)
     TCGv_i64 t0, t1;
     TCGCond cond;
 
-    opc = MASK_LMI(ctx->opcode);
+    opc = MASK_LMMI(ctx->opcode);
     switch (opc) {
     case OPC_ADD_CP2:
     case OPC_SUB_CP2:
@@ -27161,7 +27162,7 @@ static void decode_opc_special2_legacy(CPUMIPSState 
*env, DisasContext *ctx)
     case OPC_MULTU_G_2F:
     case OPC_MOD_G_2F:
     case OPC_MODU_G_2F:
-        check_insn(ctx, INSN_LOONGSON2F);
+        check_insn(ctx, INSN_LOONGSON2F | ASE_LEXT);
         gen_loongson_integer(ctx, op1, rd, rs, rt);
         break;
     case OPC_CLO:
@@ -27194,7 +27195,7 @@ static void decode_opc_special2_legacy(CPUMIPSState 
*env, DisasContext *ctx)
     case OPC_DDIVU_G_2F:
     case OPC_DMOD_G_2F:
     case OPC_DMODU_G_2F:
-        check_insn(ctx, INSN_LOONGSON2F);
+        check_insn(ctx, INSN_LOONGSON2F | ASE_LEXT);
         gen_loongson_integer(ctx, op1, rd, rs, rt);
         break;
 #endif
@@ -30641,7 +30642,7 @@ static void decode_opc(CPUMIPSState *env, DisasContext 
*ctx)
         }
         break;
     case OPC_CP2:
-        check_insn(ctx, INSN_LOONGSON2F);
+        check_insn(ctx, ASE_LMMI);
         /* Note that these instructions use different fields.  */
         gen_loongson_multimedia(ctx, sa, rd, rt);
         break;
-- 
2.27.0