[PATCH-for-5.2?] target/mips/translate: Check R6 reserved encoding for Load Linked Word

[Philippe Mathieu-Daudé]

Release 6 recoded the 'Load Linked Word' using SPECIAL3 opcode,
this opcode (0b110000) is now reserved.

Ref: A.2 Instruction Bit Encoding Tables:

  "6Rm instructions signal a Reserved Instruction exception
   when executed by a Release 6 implementation."

The check was added in commit 4368b29a26e ("target-mips: move
LL and SC instructions") but got lost during latter refactor
in commit d9224450208 ("target-mips: Tighten ISA level checks").

Fixes: d9224450208 ("target-mips: Tighten ISA level checks")
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
 target/mips/translate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/mips/translate.c b/target/mips/translate.c
index c64a1bc42e1..b1e7c674d3f 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -30993,6 +30993,7 @@ static void decode_opc(CPUMIPSState *env, DisasContext 
*ctx)
          break;
     case OPC_LL: /* Load and stores */
         check_insn(ctx, ISA_MIPS2);
+        check_insn_opc_removed(ctx, ISA_MIPS32R6);
         if (ctx->insn_flags & INSN_R5900) {
             check_insn_opc_user_only(ctx, INSN_R5900);
         }
-- 
2.26.2