On 12/06/2015 15:02, Yongbok Kim wrote:
> add new microMIPS32 Release 6 Major opcode instructions
>
> Signed-off-by: Yongbok Kim <yongbok....@imgtec.com>
> ---
> target-mips/translate.c | 58 ++++++++++++++++++++++++++++++++++++++++++++--
> 1 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/target-mips/translate.c b/target-mips/translate.c
> index 5be2a9c..3ac9632 100644
> --- a/target-mips/translate.c
> +++ b/target-mips/translate.c
> @@ -14596,8 +14596,21 @@ static void decode_micromips32_opc (CPUMIPSState
> *env, DisasContext *ctx,
> }
> break;
> case ADDI32:
> - mips32_op = OPC_ADDI;
> - goto do_addi;
> + /* AUI, LUI */
> + if (ctx->insn_flags & ISA_MIPS32R6) {
> + if (rs != 0) {
> + /* AUI */
> + tcg_gen_addi_tl(cpu_gpr[rt], cpu_gpr[rs], imm << 16);
> + tcg_gen_ext32s_tl(cpu_gpr[rt], cpu_gpr[rt]);
> + } else {
> + /* LUI */
> + tcg_gen_movi_tl(cpu_gpr[rt], imm << 16);
> + }
Can't we just call gen_logic_imm(ctx, OPC_LUI, rt, rs, imm) here to avoid
duplication?
> + } else {
> + mips32_op = OPC_ADDI;
> + goto do_addi;
> + }
> + break;
> case ADDIU32:
> mips32_op = OPC_ADDIU;
> do_addi:
> @@ -14719,7 +14732,46 @@ static void decode_micromips32_opc (CPUMIPSState
> *env, DisasContext *ctx,
> gen_cop1_ldst(ctx, mips32_op, rt, rs, imm);
> break;
> case ADDIUPC:
> - {
> + /* PCREL: ADDIUPC, AUIPC, ALUIPC, LWPC */
> + if (ctx->insn_flags & ISA_MIPS32R6) {
> + int reg = ZIMM(ctx->opcode, 21, 5);
> + target_long offset;
> + target_long addr;
> + switch ((ctx->opcode >> 16) & 0x1f) {
> + case ADDIUPC_00 ... ADDIUPC_07:
> + if (reg != 0) {
> + offset = sextract32(ctx->opcode << 2, 0, 21);
> + addr = addr_add(ctx, ctx->pc & ~0x3, offset);
> + tcg_gen_movi_tl(cpu_gpr[reg], addr);
> + }
> + break;
> + case AUIPC:
> + if (reg != 0) {
> + offset = imm << 16;
> + addr = addr_add(ctx, ctx->pc, offset);
> + tcg_gen_movi_tl(cpu_gpr[reg], addr);
> + }
> + break;
> + case ALUIPC:
> + if (reg != 0) {
> + offset = imm << 16;
> + addr = ~0xFFFF & addr_add(ctx, ctx->pc, offset);
> + tcg_gen_movi_tl(cpu_gpr[reg], addr);
> + }
> + break;
> + case LWPC_08 ... LWPC_0F:
> + if (reg != 0) {
> + target_long addr;
> + offset = sextract32(ctx->opcode << 2, 0, 21);
> + addr = addr_add(ctx, ctx->pc & ~0x3, offset);
> + gen_r6_ld(addr, reg, ctx->mem_idx, MO_TESL);
> + }
> + break;
> + default:
> + generate_exception(ctx, EXCP_RI);
> + break;
> + }
This looks very similar to equivalent MIPS R6 instructions. With relatively
small changes in gen_pcrel() we could reuse it for these instructions I think.
Leon
