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target/arm: Implement FEAT_EPAC

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Signed-off-by: Aaron Lindsay <aaron@os.amperecomputing.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230829232335.965414-7-richard.henderson@linaro.org
Message-Id: <20230609172324.982888-5-aaron@os.amperecomputing.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aaron Lindsay 2023-08-29 16:23:29 -07:00 committed by Peter Maydell
parent 399e5e7125
commit c3ccd5669e
3 changed files with 13 additions and 6 deletions
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1
docs/system/arm/emulation.rst
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@ -28,6 +28,7 @@ the following architecture extensions:
- FEAT_DotProd (Advanced SIMD dot product instructions)
- FEAT_DoubleFault (Double Fault Extension)
- FEAT_E0PD (Preventing EL0 access to halves of address maps)
- FEAT_EPAC (Enhanced pointer authentication)
- FEAT_ETS (Enhanced Translation Synchronization)
- FEAT_EVT (Enhanced Virtualization Traps)
- FEAT_FCMA (Floating-point complex number instructions)

2
target/arm/tcg/cpu64.c
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@ -803,7 +803,7 @@ void aarch64_max_tcg_initfn(Object *obj)
t = cpu->isar.id_aa64isar1;
t = FIELD_DP64(t, ID_AA64ISAR1, DPB, 2); /* FEAT_DPB2 */
t = FIELD_DP64(t, ID_AA64ISAR1, APA, PauthFeat_1);
t = FIELD_DP64(t, ID_AA64ISAR1, APA, PauthFeat_EPAC);
t = FIELD_DP64(t, ID_AA64ISAR1, API, 1);
t = FIELD_DP64(t, ID_AA64ISAR1, JSCVT, 1); /* FEAT_JSCVT */
t = FIELD_DP64(t, ID_AA64ISAR1, FCMA, 1); /* FEAT_FCMA */

16
target/arm/tcg/pauth_helper.c
View File

@ -326,8 +326,10 @@ static uint64_t pauth_computepac(CPUARMState *env, uint64_t data,
static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,
ARMPACKey *key, bool data)
{
ARMCPU *cpu = env_archcpu(env);
ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env);
ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data, false);
ARMPauthFeature pauth_feature = cpu_isar_feature(pauth_feature, cpu);
uint64_t pac, ext_ptr, ext, test;
int bot_bit, top_bit;
@ -351,11 +353,15 @@ static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,
*/
test = sextract64(ptr, bot_bit, top_bit - bot_bit);
if (test != 0 && test != -1) {
/*
* Note that our top_bit is one greater than the pseudocode's
* version, hence "- 2" here.
*/
pac ^= MAKE_64BIT_MASK(top_bit - 2, 1);
if (pauth_feature == PauthFeat_EPAC) {
pac = 0;
} else {
/*
* Note that our top_bit is one greater than the pseudocode's
* version, hence "- 2" here.
*/
pac ^= MAKE_64BIT_MASK(top_bit - 2, 1);
}
}
/*