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| author | Richard Henderson <richard.henderson@linaro.org> | 2019-01-21 10:23:13 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2019-01-21 10:38:54 +0000 |
| commit | 04d13549fa10bb9775a90701e4e6fd0a2cbf83cb (patch) | |
| tree | c0d44c16b0bc386123eacd40f41971feaad28b61 | |
| parent | 5d8634f5a3a8474525edcfd581a659830e9e97c0 (diff) | |
target/arm: Implement pauth_strip
Stripping out the authentication data does not require any crypto,
it merely requires the virtual address parameters.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190108223129.5570-25-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | target/arm/pauth_helper.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c index 902f68a24c..e02376a2d0 100644 --- a/target/arm/pauth_helper.c +++ b/target/arm/pauth_helper.c @@ -38,6 +38,15 @@ static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier, g_assert_not_reached(); /* FIXME */ } +static uint64_t pauth_original_ptr(uint64_t ptr, ARMVAParameters param) +{ + uint64_t extfield = -param.select; + int bot_pac_bit = 64 - param.tsz; + int top_pac_bit = 64 - 8 * param.tbi; + + return deposit64(ptr, bot_pac_bit, top_pac_bit - bot_pac_bit, extfield); +} + static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier, ARMPACKey *key, bool data, int keynumber) { @@ -46,7 +55,10 @@ static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier, static uint64_t pauth_strip(CPUARMState *env, uint64_t ptr, bool data) { - g_assert_not_reached(); /* FIXME */ + ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env); + ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data); + + return pauth_original_ptr(ptr, param); } static void QEMU_NORETURN pauth_trap(CPUARMState *env, int target_el, |