[Qemu-devel] [Bug 1071149] [NEW] target-mips: special3 instruction dinsm translation error

[Nikita Kanunnikov]

Public bug reported:

Function decode_opc() in translate.c calls function gen_bitops(), which
has such prototype:

/* special3 bitfield operations */
static void gen_bitops (DisasContext *ctx, uint32_t opc, int rt,
                        int rs, int lsb, int msb)

The code for DINSM instruction is:

case OPC_DINSM ... OPC_DINS:
            check_insn(env, ctx, ISA_MIPS64R2);
            check_mips_64(ctx);
            gen_bitops(ctx, op1, rt, rs, sa, rd);
            break;

But rd ≠ msb according to MIPS64R2 standard, rd = msb - 32.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1071149

Title:
  target-mips: special3 instruction dinsm translation error

Status in QEMU:
  New

Bug description:
  Function decode_opc() in translate.c calls function gen_bitops(),
  which has such prototype:

  /* special3 bitfield operations */
  static void gen_bitops (DisasContext *ctx, uint32_t opc, int rt,
                          int rs, int lsb, int msb)

  The code for DINSM instruction is:

  case OPC_DINSM ... OPC_DINS:
              check_insn(env, ctx, ISA_MIPS64R2);
              check_mips_64(ctx);
              gen_bitops(ctx, op1, rt, rs, sa, rd);
              break;

  But rd ≠ msb according to MIPS64R2 standard, rd = msb - 32.

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