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target/arm: Implement the HFGITR_EL2.ERET trap

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Implement the HFGITR_EL2.ERET fine-grained trap.  This traps
execution from AArch64 EL1 of ERET, ERETAA and ERETAB.  The trap is
reported with a syndrome value of 0x1a.

The trap must take precedence over a possible pointer-authentication
trap for ERETAA and ERETAB.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Fuad Tabba <tabba@google.com>
Message-id: 20230130182459.3309057-21-peter.maydell@linaro.org
Message-id: 20230127175507.2895013-21-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2023-01-30 18:24:56 +00:00
parent 950037e280
commit 5572f7557f
5 changed files with 26 additions and 0 deletions
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3
target/arm/helper.c
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@ -12065,6 +12065,9 @@ static CPUARMTBFlags rebuild_hflags_a64(CPUARMState *env, int el, int fp_el,
if (arm_fgt_active(env, el)) {
DP_TBFLAG_ANY(flags, FGT_ACTIVE, 1);
if (FIELD_EX64(env->cp15.fgt_exec[FGTREG_HFGITR], HFGITR_EL2, ERET)) {
DP_TBFLAG_A64(flags, FGT_ERET, 1);
}
}
if (cpu_isar_feature(aa64_mte, env_archcpu(env))) {