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target/arm: Hoist XSCALE_CPAR, VECLEN, VECSTRIDE in cpu_get_tb_cpu_state 

We do not need to compute any of these values for M-profile.
Further, XSCALE_CPAR overlaps VECSTRIDE so obviously the two
sets must be mutually exclusive.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20191023150057.25731-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-10-23 11:00:42 -04:00 committed by Peter Maydell
parent 83f4baef3e
commit bbad7c62d4
1 changed files with 14 additions and 7 deletions
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21
target/arm/helper.c
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@ -11235,21 +11235,28 @@ void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
}
} else {
flags = rebuild_hflags_a32(env, fp_el, mmu_idx);
/*
* Note that XSCALE_CPAR shares bits with VECSTRIDE.
* Note that VECLEN+VECSTRIDE are RES0 for M-profile.
*/
if (arm_feature(env, ARM_FEATURE_XSCALE)) {
flags = FIELD_DP32(flags, TBFLAG_A32,
XSCALE_CPAR, env->cp15.c15_cpar);
} else {
flags = FIELD_DP32(flags, TBFLAG_A32, VECLEN,
env->vfp.vec_len);
flags = FIELD_DP32(flags, TBFLAG_A32, VECSTRIDE,
env->vfp.vec_stride);
}
}
flags = FIELD_DP32(flags, TBFLAG_A32, THUMB, env->thumb);
flags = FIELD_DP32(flags, TBFLAG_A32, VECLEN, env->vfp.vec_len);
flags = FIELD_DP32(flags, TBFLAG_A32, VECSTRIDE, env->vfp.vec_stride);
flags = FIELD_DP32(flags, TBFLAG_A32, CONDEXEC, env->condexec_bits);
if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30)
|| arm_el_is_aa64(env, 1) || arm_feature(env, ARM_FEATURE_M)) {
flags = FIELD_DP32(flags, TBFLAG_A32, VFPEN, 1);
}
/* Note that XSCALE_CPAR shares bits with VECSTRIDE */
if (arm_feature(env, ARM_FEATURE_XSCALE)) {
flags = FIELD_DP32(flags, TBFLAG_A32,
XSCALE_CPAR, env->cp15.c15_cpar);
}
}
/* The SS_ACTIVE and PSTATE_SS bits correspond to the state machine