target/arm: Implement pauth_auth
This is not really functional yet, because the crypto is not yet implemented. This, however follows the Auth pseudo function. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190108223129.5570-26-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -50,7 +50,26 @@ static uint64_t pauth_original_ptr(uint64_t ptr, ARMVAParameters param)
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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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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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int bot_bit, top_bit;
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uint64_t pac, orig_ptr, test;
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orig_ptr = pauth_original_ptr(ptr, param);
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pac = pauth_computepac(orig_ptr, modifier, *key);
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bot_bit = 64 - param.tsz;
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top_bit = 64 - 8 * param.tbi;
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test = (pac ^ ptr) & ~MAKE_64BIT_MASK(55, 1);
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if (unlikely(extract64(test, bot_bit, top_bit - bot_bit))) {
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int error_code = (keynumber << 1) | (keynumber ^ 1);
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if (param.tbi) {
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return deposit64(ptr, 53, 2, error_code);
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} else {
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return deposit64(ptr, 61, 2, error_code);
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}
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}
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return orig_ptr;
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}
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}
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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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