diff options
| author | Fredrik Noring <noring@nocrew.org> | 2018-11-07 20:19:14 +0100 |
|---|---|---|
| committer | Aleksandar Markovic <amarkovic@wavecomp.com> | 2018-11-17 19:29:34 +0100 |
| commit | 9dc324ce66807cc231fe890d4031de595ad1cf72 (patch) | |
| tree | 18f709f9a40bb3215cf3438774260eba6c850382 /target/mips/translate.c | |
| parent | c42171c3bfe6fdc94c183f664c4d6548f8c5488b (diff) | |
target/mips: Fix decoding mechanism of special R5900 opcodes
MOVN, MOVZ, MFHI, MFLO, MTHI, MTLO, MULT, MULTU, DIV, DIVU, DMULT,
DMULTU, DDIV, DDIVU and JR are decoded in decode_opc_special_tx79
instead of the generic decode_opc_special_legacy.
Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Fredrik Noring <noring@nocrew.org>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Diffstat (limited to 'target/mips/translate.c')
| -rw-r--r-- | target/mips/translate.c | 54 |
1 files changed, 50 insertions, 4 deletions
diff --git a/target/mips/translate.c b/target/mips/translate.c index 3ddd70043a..a21b277175 100644 --- a/target/mips/translate.c +++ b/target/mips/translate.c @@ -23863,6 +23863,53 @@ static void decode_opc_special_r6(CPUMIPSState *env, DisasContext *ctx) } } +static void decode_opc_special_tx79(CPUMIPSState *env, DisasContext *ctx) +{ + int rs = extract32(ctx->opcode, 21, 5); + int rt = extract32(ctx->opcode, 16, 5); + int rd = extract32(ctx->opcode, 11, 5); + uint32_t op1 = MASK_SPECIAL(ctx->opcode); + + switch (op1) { + case OPC_MOVN: /* Conditional move */ + case OPC_MOVZ: + gen_cond_move(ctx, op1, rd, rs, rt); + break; + case OPC_MFHI: /* Move from HI/LO */ + case OPC_MFLO: + gen_HILO(ctx, op1, 0, rd); + break; + case OPC_MTHI: + case OPC_MTLO: /* Move to HI/LO */ + gen_HILO(ctx, op1, 0, rs); + break; + case OPC_MULT: + case OPC_MULTU: + gen_mul_txx9(ctx, op1, rd, rs, rt); + break; + case OPC_DIV: + case OPC_DIVU: + gen_muldiv(ctx, op1, 0, rs, rt); + break; +#if defined(TARGET_MIPS64) + case OPC_DMULT: + case OPC_DMULTU: + case OPC_DDIV: + case OPC_DDIVU: + check_insn_opc_user_only(ctx, INSN_R5900); + gen_muldiv(ctx, op1, 0, rs, rt); + break; +#endif + case OPC_JR: + gen_compute_branch(ctx, op1, 4, rs, 0, 0, 4); + break; + default: /* Invalid */ + MIPS_INVAL("special_tx79"); + generate_exception_end(ctx, EXCP_RI); + break; + } +} + static void decode_opc_special_legacy(CPUMIPSState *env, DisasContext *ctx) { int rs, rt, rd, sa; @@ -23878,7 +23925,7 @@ static void decode_opc_special_legacy(CPUMIPSState *env, DisasContext *ctx) case OPC_MOVN: /* Conditional move */ case OPC_MOVZ: check_insn(ctx, ISA_MIPS4 | ISA_MIPS32 | - INSN_LOONGSON2E | INSN_LOONGSON2F | INSN_R5900); + INSN_LOONGSON2E | INSN_LOONGSON2F); gen_cond_move(ctx, op1, rd, rs, rt); break; case OPC_MFHI: /* Move from HI/LO */ @@ -23905,8 +23952,6 @@ static void decode_opc_special_legacy(CPUMIPSState *env, DisasContext *ctx) check_insn(ctx, INSN_VR54XX); op1 = MASK_MUL_VR54XX(ctx->opcode); gen_mul_vr54xx(ctx, op1, rd, rs, rt); - } else if (ctx->insn_flags & INSN_R5900) { - gen_mul_txx9(ctx, op1, rd, rs, rt); } else { gen_muldiv(ctx, op1, rd & 3, rs, rt); } @@ -23921,7 +23966,6 @@ static void decode_opc_special_legacy(CPUMIPSState *env, DisasContext *ctx) case OPC_DDIV: case OPC_DDIVU: check_insn(ctx, ISA_MIPS3); - check_insn_opc_user_only(ctx, INSN_R5900); check_mips_64(ctx); gen_muldiv(ctx, op1, 0, rs, rt); break; @@ -24148,6 +24192,8 @@ static void decode_opc_special(CPUMIPSState *env, DisasContext *ctx) default: if (ctx->insn_flags & ISA_MIPS32R6) { decode_opc_special_r6(env, ctx); + } else if (ctx->insn_flags & INSN_R5900) { + decode_opc_special_tx79(env, ctx); } else { decode_opc_special_legacy(env, ctx); } |