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>
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@ -38,6 +38,15 @@ static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,
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g_assert_not_reached(); /* FIXME */
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g_assert_not_reached(); /* FIXME */
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}
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}
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static uint64_t pauth_original_ptr(uint64_t ptr, ARMVAParameters param)
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{
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uint64_t extfield = -param.select;
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int bot_pac_bit = 64 - param.tsz;
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int top_pac_bit = 64 - 8 * param.tbi;
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return deposit64(ptr, bot_pac_bit, top_pac_bit - bot_pac_bit, extfield);
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}
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static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,
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static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,
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ARMPACKey *key, bool data, int keynumber)
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ARMPACKey *key, bool data, int keynumber)
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{
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{
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@ -46,7 +55,10 @@ static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,
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static uint64_t pauth_strip(CPUARMState *env, uint64_t ptr, bool data)
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static uint64_t pauth_strip(CPUARMState *env, uint64_t ptr, bool data)
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{
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{
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g_assert_not_reached(); /* FIXME */
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ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env);
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ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data);
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return pauth_original_ptr(ptr, param);
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}
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}
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static void QEMU_NORETURN pauth_trap(CPUARMState *env, int target_el,
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static void QEMU_NORETURN pauth_trap(CPUARMState *env, int target_el,
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