diff options
Diffstat (limited to 'target/arm/helper.c')
| -rw-r--r-- | target/arm/helper.c | 41 |
1 files changed, 38 insertions, 3 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c index 22ea8fbe36..72b37b7cf1 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -6725,12 +6725,47 @@ static CPAccessResult access_esm(CPUARMState *env, const ARMCPRegInfo *ri, return CP_ACCESS_OK; } +/* ResetSVEState */ +static void arm_reset_sve_state(CPUARMState *env) +{ + memset(env->vfp.zregs, 0, sizeof(env->vfp.zregs)); + /* Recall that FFR is stored as pregs[16]. */ + memset(env->vfp.pregs, 0, sizeof(env->vfp.pregs)); + vfp_set_fpcr(env, 0x0800009f); +} + +void aarch64_set_svcr(CPUARMState *env, uint64_t new, uint64_t mask) +{ + uint64_t change = (env->svcr ^ new) & mask; + + if (change == 0) { + return; + } + env->svcr ^= change; + + if (change & R_SVCR_SM_MASK) { + arm_reset_sve_state(env); + } + + /* + * ResetSMEState. + * + * SetPSTATE_ZA zeros on enable and disable. We can zero this only + * on enable: while disabled, the storage is inaccessible and the + * value does not matter. We're not saving the storage in vmstate + * when disabled either. + */ + if (change & new & R_SVCR_ZA_MASK) { + memset(env->zarray, 0, sizeof(env->zarray)); + } + + arm_rebuild_hflags(env); +} + static void svcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value) { - helper_set_pstate_sm(env, FIELD_EX64(value, SVCR, SM)); - helper_set_pstate_za(env, FIELD_EX64(value, SVCR, ZA)); - arm_rebuild_hflags(env); + aarch64_set_svcr(env, value, -1); } static void smcr_write(CPUARMState *env, const ARMCPRegInfo *ri, |