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[PATCH 6/7] target/arm: Implement v8.3 FPAC and FPACCOMBINE
From: |
Aaron Lindsay |
Subject: |
[PATCH 6/7] target/arm: Implement v8.3 FPAC and FPACCOMBINE |
Date: |
Thu, 2 Feb 2023 16:11:28 -0500 |
Signed-off-by: Aaron Lindsay <aaron@os.amperecomputing.com>
---
target/arm/pauth_helper.c | 26 ++++++++++++++++++++++++++
target/arm/syndrome.h | 6 ++++++
2 files changed, 32 insertions(+)
diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c
index 66dc90a289..3a2772de0e 100644
--- a/target/arm/pauth_helper.c
+++ b/target/arm/pauth_helper.c
@@ -385,6 +385,21 @@ static uint64_t pauth_original_ptr(uint64_t ptr,
ARMVAParameters param)
return deposit64(ptr, bot_pac_bit, top_pac_bit - bot_pac_bit, extfield);
}
+static G_NORETURN
+void pauth_fail_exception(CPUARMState *env, int error_code)
+{
+ int target_el = arm_current_el(env);
+ if (target_el == 0) {
+ uint64_t hcr = arm_hcr_el2_eff(env);
+ if (arm_is_el2_enabled(env) && (hcr & HCR_TGE))
+ target_el = 2;
+ else
+ target_el = 1;
+ }
+
+ raise_exception_ra(env, EXCP_UDEF, syn_pacfail(error_code), target_el,
GETPC());
+}
+
static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,
ARMPACKey *key, bool data, int keynumber,
bool is_combined)
@@ -403,6 +418,17 @@ static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr,
uint64_t modifier,
uint64_t xor_mask = MAKE_64BIT_MASK(bot_bit, top_bit - bot_bit + 1) &
~MAKE_64BIT_MASK(55, 1);
result = ((ptr ^ pac) & xor_mask) | (ptr & ~xor_mask);
+ if (cpu_isar_feature(aa64_fpac_combine, env_archcpu(env)) ||
+ (cpu_isar_feature(aa64_fpac, env_archcpu(env)) &&
+ !is_combined)) {
+ int fpac_top = param.tbi ? 55 : 64;
+ uint64_t fpac_mask = MAKE_64BIT_MASK(bot_bit, fpac_top - bot_bit);
+ test = (result ^ sextract64(result, 55, 1)) & fpac_mask;
+ if (unlikely(test)) {
+ int error_code = ((data ? 1 : 0) << 1) | (keynumber);
+ pauth_fail_exception(env, error_code);
+ }
+ }
} else {
test = (pac ^ ptr) & ~MAKE_64BIT_MASK(55, 1);
if (unlikely(extract64(test, bot_bit, top_bit - bot_bit))) {
diff --git a/target/arm/syndrome.h b/target/arm/syndrome.h
index 73df5e3793..885a85735c 100644
--- a/target/arm/syndrome.h
+++ b/target/arm/syndrome.h
@@ -48,6 +48,7 @@ enum arm_exception_class {
EC_AA64_SMC = 0x17,
EC_SYSTEMREGISTERTRAP = 0x18,
EC_SVEACCESSTRAP = 0x19,
+ EC_PACFAIL = 0x1c,
EC_SMETRAP = 0x1d,
EC_INSNABORT = 0x20,
EC_INSNABORT_SAME_EL = 0x21,
@@ -221,6 +222,11 @@ static inline uint32_t syn_smetrap(SMEExceptionType etype,
bool is_16bit)
| (is_16bit ? 0 : ARM_EL_IL) | etype;
}
+static inline uint32_t syn_pacfail(int error_code)
+{
+ return (EC_PACFAIL << ARM_EL_EC_SHIFT) | error_code;
+}
+
static inline uint32_t syn_pactrap(void)
{
return EC_PACTRAP << ARM_EL_EC_SHIFT;
--
2.25.1
- Re: [PATCH 1/7] target/arm: v8.3 PAC ID_AA64ISAR[12] feature-detection, (continued)
- [PATCH 3/7] target/arm: Implement v8.3 EnhancedPAC, Aaron Lindsay, 2023/02/02
- [PATCH 2/7] target/arm: Implement v8.3 QARMA3 PAC cipher, Aaron Lindsay, 2023/02/02
- [PATCH 4/7] target/arm: Implement v8.3 Pauth2, Aaron Lindsay, 2023/02/02
- [PATCH 5/7] targer/arm: Inform helpers whether a PAC instruction is 'combined', Aaron Lindsay, 2023/02/02
- [PATCH 6/7] target/arm: Implement v8.3 FPAC and FPACCOMBINE,
Aaron Lindsay <=
- [PATCH 7/7] target/arm: Add CPU properties for most v8.3 PAC features, Aaron Lindsay, 2023/02/02