Commit 04d13549 authored by Richard Henderson's avatar Richard Henderson Committed by Peter Maydell
Browse files

target/arm: Implement pauth_strip 



Stripping out the authentication data does not require any crypto,
it merely requires the virtual address parameters.

Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Message-id: 20190108223129.5570-25-richard.henderson@linaro.org
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 5d8634f5

target/arm/pauth_helper.c

+13 −1
Original line number Diff line number Diff line
@@ -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,