diff options
| -rw-r--r-- | docs/system/arm/emulation.rst | 1 | ||||
| -rw-r--r-- | target/arm/cpregs.h | 24 | ||||
| -rw-r--r-- | target/arm/cpu.h | 5 | ||||
| -rw-r--r-- | target/arm/cpu64.c | 1 | ||||
| -rw-r--r-- | target/arm/op_helper.c | 9 | ||||
| -rw-r--r-- | target/arm/translate-a64.c | 28 |
6 files changed, 66 insertions, 2 deletions
diff --git a/docs/system/arm/emulation.rst b/docs/system/arm/emulation.rst index 8f25502ced..3e95bba0d2 100644 --- a/docs/system/arm/emulation.rst +++ b/docs/system/arm/emulation.rst @@ -31,6 +31,7 @@ the following architecture extensions: - FEAT_FlagM2 (Enhancements to flag manipulation instructions) - FEAT_HPDS (Hierarchical permission disables) - FEAT_I8MM (AArch64 Int8 matrix multiplication instructions) +- FEAT_IDST (ID space trap handling) - FEAT_IESB (Implicit error synchronization event) - FEAT_JSCVT (JavaScript conversion instructions) - FEAT_LOR (Limited ordering regions) diff --git a/target/arm/cpregs.h b/target/arm/cpregs.h index db03d6a7e1..d9b678c2f1 100644 --- a/target/arm/cpregs.h +++ b/target/arm/cpregs.h @@ -461,4 +461,28 @@ static inline bool cp_access_ok(int current_el, /* Raw read of a coprocessor register (as needed for migration, etc) */ uint64_t read_raw_cp_reg(CPUARMState *env, const ARMCPRegInfo *ri); +/* + * Return true if the cp register encoding is in the "feature ID space" as + * defined by FEAT_IDST (and thus should be reported with ER_ELx.EC + * as EC_SYSTEMREGISTERTRAP rather than EC_UNCATEGORIZED). + */ +static inline bool arm_cpreg_encoding_in_idspace(uint8_t opc0, uint8_t opc1, + uint8_t opc2, + uint8_t crn, uint8_t crm) +{ + return opc0 == 3 && (opc1 == 0 || opc1 == 1 || opc1 == 3) && + crn == 0 && crm < 8; +} + +/* + * As arm_cpreg_encoding_in_idspace(), but take the encoding from an + * ARMCPRegInfo. + */ +static inline bool arm_cpreg_in_idspace(const ARMCPRegInfo *ri) +{ + return ri->state == ARM_CP_STATE_AA64 && + arm_cpreg_encoding_in_idspace(ri->opc0, ri->opc1, ri->opc2, + ri->crn, ri->crm); +} + #endif /* TARGET_ARM_CPREGS_H */ diff --git a/target/arm/cpu.h b/target/arm/cpu.h index 98efc638bb..a99b430e54 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -3946,6 +3946,11 @@ static inline bool isar_feature_aa64_fwb(const ARMISARegisters *id) return FIELD_EX64(id->id_aa64mmfr2, ID_AA64MMFR2, FWB) != 0; } +static inline bool isar_feature_aa64_ids(const ARMISARegisters *id) +{ + return FIELD_EX64(id->id_aa64mmfr2, ID_AA64MMFR2, IDS) != 0; +} + static inline bool isar_feature_aa64_bti(const ARMISARegisters *id) { return FIELD_EX64(id->id_aa64pfr1, ID_AA64PFR1, BT) != 0; diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index e83c013e1f..804a54922c 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -928,6 +928,7 @@ static void aarch64_max_initfn(Object *obj) t = FIELD_DP64(t, ID_AA64MMFR2, IESB, 1); /* FEAT_IESB */ t = FIELD_DP64(t, ID_AA64MMFR2, VARANGE, 1); /* FEAT_LVA */ t = FIELD_DP64(t, ID_AA64MMFR2, ST, 1); /* FEAT_TTST */ + t = FIELD_DP64(t, ID_AA64MMFR2, IDS, 1); /* FEAT_IDST */ t = FIELD_DP64(t, ID_AA64MMFR2, FWB, 1); /* FEAT_S2FWB */ t = FIELD_DP64(t, ID_AA64MMFR2, TTL, 1); /* FEAT_TTL */ t = FIELD_DP64(t, ID_AA64MMFR2, BBM, 2); /* FEAT_BBM at level 2 */ diff --git a/target/arm/op_helper.c b/target/arm/op_helper.c index 390b6578a8..c4bd668870 100644 --- a/target/arm/op_helper.c +++ b/target/arm/op_helper.c @@ -631,6 +631,7 @@ uint32_t HELPER(mrs_banked)(CPUARMState *env, uint32_t tgtmode, uint32_t regno) void HELPER(access_check_cp_reg)(CPUARMState *env, void *rip, uint32_t syndrome, uint32_t isread) { + ARMCPU *cpu = env_archcpu(env); const ARMCPRegInfo *ri = rip; CPAccessResult res = CP_ACCESS_OK; int target_el; @@ -674,6 +675,14 @@ void HELPER(access_check_cp_reg)(CPUARMState *env, void *rip, uint32_t syndrome, case CP_ACCESS_TRAP: break; case CP_ACCESS_TRAP_UNCATEGORIZED: + if (cpu_isar_feature(aa64_ids, cpu) && isread && + arm_cpreg_in_idspace(ri)) { + /* + * FEAT_IDST says this should be reported as EC_SYSTEMREGISTERTRAP, + * not EC_UNCATEGORIZED + */ + break; + } syndrome = syn_uncategorized(); break; default: diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index 6a27234a5c..176a3c83ba 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -1795,6 +1795,30 @@ static void gen_set_nzcv(TCGv_i64 tcg_rt) tcg_temp_free_i32(nzcv); } +static void gen_sysreg_undef(DisasContext *s, bool isread, + uint8_t op0, uint8_t op1, uint8_t op2, + uint8_t crn, uint8_t crm, uint8_t rt) +{ + /* + * Generate code to emit an UNDEF with correct syndrome + * information for a failed system register access. + * This is EC_UNCATEGORIZED (ie a standard UNDEF) in most cases, + * but if FEAT_IDST is implemented then read accesses to registers + * in the feature ID space are reported with the EC_SYSTEMREGISTERTRAP + * syndrome. + */ + uint32_t syndrome; + + if (isread && dc_isar_feature(aa64_ids, s) && + arm_cpreg_encoding_in_idspace(op0, op1, op2, crn, crm)) { + syndrome = syn_aa64_sysregtrap(op0, op1, op2, crn, crm, rt, isread); + } else { + syndrome = syn_uncategorized(); + } + gen_exception_insn(s, s->pc_curr, EXCP_UDEF, syndrome, + default_exception_el(s)); +} + /* MRS - move from system register * MSR (register) - move to system register * SYS @@ -1820,13 +1844,13 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread, qemu_log_mask(LOG_UNIMP, "%s access to unsupported AArch64 " "system register op0:%d op1:%d crn:%d crm:%d op2:%d\n", isread ? "read" : "write", op0, op1, crn, crm, op2); - unallocated_encoding(s); + gen_sysreg_undef(s, isread, op0, op1, op2, crn, crm, rt); return; } /* Check access permissions */ if (!cp_access_ok(s->current_el, ri, isread)) { - unallocated_encoding(s); + gen_sysreg_undef(s, isread, op0, op1, op2, crn, crm, rt); return; } |