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target/arm: Implement pauth_auth

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This is not really functional yet, because the crypto is not yet
implemented. This, however follows the Auth pseudo function.

Backports commit a7bfa086c973a51fc18116c9d2e22a0e0069edba from qemu
This commit is contained in:
Richard Henderson 2019-01-22 16:32:17 -05:00 committed by Lioncash
parent 2545f8cf84
commit 4281ae11c4
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 20 additions and 1 deletions
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21
qemu/target/arm/pauth_helper.c
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@ -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)