yuzu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2025-01-22 23:11:03 +00:00
Code Issues Packages Projects Releases Wiki Activity

target/mips: Fix decoding mechanism of special R5900 opcodes

Browse source 
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.

Backports commit 9dc324ce66807cc231fe890d4031de595ad1cf72 from qemu
This commit is contained in:
Fredrik Noring 2018-11-23 18:35:52 -05:00 committed by Lioncash
parent f23c6fd006
commit b671293fe0
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 50 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

54
qemu/target/mips/translate.c
View file

@ -24019,6 +24019,53 @@ 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;
@ -24034,7 +24081,7 @@ 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 */
@ -24061,8 +24108,6 @@ 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);
}
@ -24077,7 +24122,6 @@ 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;
@ -24305,6 +24349,8 @@ 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);
}