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target/arm: Implement pauth_strip

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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>
This commit is contained in:
Richard Henderson 2019-01-21 10:23:13 +00:00 committed by Peter Maydell
parent 5d8634f5a3
commit 04d13549fa
1 changed files with 13 additions and 1 deletions
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14
target/arm/pauth_helper.c
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@ -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,