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[Qemu-devel] [PATCH v3 25/31] target/arm: Implement pauth_auth
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v3 25/31] target/arm: Implement pauth_auth |
Date: |
Wed, 9 Jan 2019 08:31:23 +1000 |
This is not really functional yet, because the crypto is not yet
implemented. This, however follows the Auth pseudo function.
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
target/arm/pauth_helper.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c
index e02376a2d0..fa7707e0bf 100644
--- a/target/arm/pauth_helper.c
+++ b/target/arm/pauth_helper.c
@@ -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)
--
2.17.2
- Re: [Qemu-devel] [PATCH v3 19/31] target/arm: Merge TBFLAG_AA_TB{0, 1} to TBII, (continued)
- [Qemu-devel] [PATCH v3 18/31] target/arm: Create ARMVAParameters and helpers, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 21/31] target/arm: Add aa64_va_parameters_both, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 22/31] target/arm: Decode TBID from TCR, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 23/31] target/arm: Reuse aa64_va_parameters for setting tbflags, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 24/31] target/arm: Implement pauth_strip, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 25/31] target/arm: Implement pauth_auth,
Richard Henderson <=
- [Qemu-devel] [PATCH v3 26/31] target/arm: Implement pauth_addpac, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 27/31] target/arm: Implement pauth_computepac, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 29/31] target/arm: Enable PAuth for -cpu max, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 28/31] target/arm: Add PAuth system registers, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 31/31] target/arm: Tidy TBI handling in gen_a64_set_pc, Richard Henderson, 2019/01/08
- [Qemu-devel] [PATCH v3 30/31] target/arm: Enable PAuth for user-only, Richard Henderson, 2019/01/08
- Re: [Qemu-devel] [PATCH v3 00/31] target/arm: Implement ARMv8.3-PAuth, no-reply, 2019/01/08
- Re: [Qemu-devel] [PATCH v3 00/31] target/arm: Implement ARMv8.3-PAuth, Peter Maydell, 2019/01/18