Commit a7bfa086 authored by Richard Henderson's avatar Richard Henderson Committed by Peter Maydell
Browse files

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: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Message-id: 20190108223129.5570-26-richard.henderson@linaro.org
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 04d13549

target/arm/pauth_helper.c

+20 −1
Original line number Diff line number Diff line
@@ -50,7 +50,26 @@ static uint64_t pauth_original_ptr(uint64_t ptr, ARMVAParameters param) 
static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,

                           ARMPACKey *key, bool data, int keynumber)

{

    g_assert_not_reached(); /* FIXME */

    ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env);

    ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data);

    int bot_bit, top_bit;

    uint64_t pac, orig_ptr, test;



    orig_ptr = pauth_original_ptr(ptr, param);

    pac = pauth_computepac(orig_ptr, modifier, *key);

    bot_bit = 64 - param.tsz;

    top_bit = 64 - 8 * param.tbi;



    test = (pac ^ ptr) & ~MAKE_64BIT_MASK(55, 1);

    if (unlikely(extract64(test, bot_bit, top_bit - bot_bit))) {

        int error_code = (keynumber << 1) | (keynumber ^ 1);

        if (param.tbi) {

            return deposit64(ptr, 53, 2, error_code);

        } else {

            return deposit64(ptr, 61, 2, error_code);

        }

    }

    return orig_ptr;

}



static uint64_t pauth_strip(CPUARMState *env, uint64_t ptr, bool data)