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target/arm: Add SMEEXC_EL to TB flags

Browse source 
This is CheckSMEAccess, which is the basis for a set of
related tests for various SME cpregs and instructions.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220620175235.60881-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-06-20 10:51:46 -07:00 committed by Peter Maydell
parent 9e5ec745e3
commit 6b2ca83e4c
4 changed files with 56 additions and 0 deletions
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2
target/arm/cpu.h
View file

@ -1134,6 +1134,7 @@ void aarch64_sync_64_to_32(CPUARMState *env);
int fp_exception_el(CPUARMState *env, int cur_el);
int sve_exception_el(CPUARMState *env, int cur_el);
int sme_exception_el(CPUARMState *env, int cur_el);
/**
* sve_vqm1_for_el:
@ -3148,6 +3149,7 @@ FIELD(TBFLAG_A64, ATA, 15, 1)
FIELD(TBFLAG_A64, TCMA, 16, 2)
FIELD(TBFLAG_A64, MTE_ACTIVE, 18, 1)
FIELD(TBFLAG_A64, MTE0_ACTIVE, 19, 1)
FIELD(TBFLAG_A64, SMEEXC_EL, 20, 2)
/*
* Helpers for using the above.

52
target/arm/helper.c
View file

@ -6218,6 +6218,55 @@ int sve_exception_el(CPUARMState *env, int el)
return 0;
}
/*
* Return the exception level to which exceptions should be taken for SME.
* C.f. the ARM pseudocode function CheckSMEAccess.
*/
int sme_exception_el(CPUARMState *env, int el)
{
#ifndef CONFIG_USER_ONLY
if (el <= 1 && !el_is_in_host(env, el)) {
switch (FIELD_EX64(env->cp15.cpacr_el1, CPACR_EL1, SMEN)) {
case 1:
if (el != 0) {
break;
}
/* fall through */
case 0:
case 2:
return 1;
}
}
if (el <= 2 && arm_is_el2_enabled(env)) {
/* CPTR_EL2 changes format with HCR_EL2.E2H (regardless of TGE). */
if (env->cp15.hcr_el2 & HCR_E2H) {
switch (FIELD_EX64(env->cp15.cptr_el[2], CPTR_EL2, SMEN)) {
case 1:
if (el != 0 || !(env->cp15.hcr_el2 & HCR_TGE)) {
break;
}
/* fall through */
case 0:
case 2:
return 2;
}
} else {
if (FIELD_EX64(env->cp15.cptr_el[2], CPTR_EL2, TSM)) {
return 2;
}
}
}
/* CPTR_EL3. Since ESM is negative we must check for EL3. */
if (arm_feature(env, ARM_FEATURE_EL3)
&& !FIELD_EX64(env->cp15.cptr_el[3], CPTR_EL3, ESM)) {
return 3;
}
#endif
return 0;
}
/*
* Given that SVE is enabled, return the vector length for EL.
*/
@ -11197,6 +11246,9 @@ static CPUARMTBFlags rebuild_hflags_a64(CPUARMState *env, int el, int fp_el,
}
DP_TBFLAG_A64(flags, SVEEXC_EL, sve_el);
}
if (cpu_isar_feature(aa64_sme, env_archcpu(env))) {
DP_TBFLAG_A64(flags, SMEEXC_EL, sme_exception_el(env, el));
}
sctlr = regime_sctlr(env, stage1);

1
target/arm/translate-a64.c
View file

@ -14603,6 +14603,7 @@ static void aarch64_tr_init_disas_context(DisasContextBase *dcbase,
dc->align_mem = EX_TBFLAG_ANY(tb_flags, ALIGN_MEM);
dc->pstate_il = EX_TBFLAG_ANY(tb_flags, PSTATE__IL);
dc->sve_excp_el = EX_TBFLAG_A64(tb_flags, SVEEXC_EL);
dc->sme_excp_el = EX_TBFLAG_A64(tb_flags, SMEEXC_EL);
dc->vl = (EX_TBFLAG_A64(tb_flags, VL) + 1) * 16;
dc->pauth_active = EX_TBFLAG_A64(tb_flags, PAUTH_ACTIVE);
dc->bt = EX_TBFLAG_A64(tb_flags, BT);

1
target/arm/translate.h
View file

@ -42,6 +42,7 @@ typedef struct DisasContext {
bool ns; /* Use non-secure CPREG bank on access */
int fp_excp_el; /* FP exception EL or 0 if enabled */
int sve_excp_el; /* SVE exception EL or 0 if enabled */
int sme_excp_el; /* SME exception EL or 0 if enabled */
int vl; /* current vector length in bytes */
bool vfp_enabled; /* FP enabled via FPSCR.EN */
int vec_len;