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[Qemu-devel] [PATCH v2 20/27] target/arm: Implement pauth_strip
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v2 20/27] target/arm: Implement pauth_strip |
Date: |
Thu, 13 Dec 2018 23:24:03 -0600 |
Stripping out the authentication data does not require any crypto,
it merely requires the virtual address parameters.
Signed-off-by: Richard Henderson <address@hidden>
---
target/arm/helper-a64.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c
index 79cc9cf47b..329af51232 100644
--- a/target/arm/helper-a64.c
+++ b/target/arm/helper-a64.c
@@ -1069,6 +1069,15 @@ 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)
{
@@ -1077,7 +1086,10 @@ 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,
--
2.17.2
- [Qemu-devel] [PATCH v2 16/27] target/arm: Introduce arm_stage1_mmu_idx, (continued)
- [Qemu-devel] [PATCH v2 16/27] target/arm: Introduce arm_stage1_mmu_idx, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 12/27] target/arm: Decode PAuth within disas_uncond_b_reg, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 15/27] target/arm: Introduce arm_mmu_idx, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 17/27] target/arm: Create ARMVAParameters and helpers, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 22/27] target/arm: Implement pauth_addpac, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 21/27] target/arm: Implement pauth_auth, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 24/27] target/arm: Add PAuth system registers, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 18/27] target/arm: Reuse aa64_va_parameters for setting tbflags, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 25/27] target/arm: Enable PAuth for -cpu max, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 26/27] target/arm: Enable PAuth for user-only, part 2, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 20/27] target/arm: Implement pauth_strip,
Richard Henderson <=
- [Qemu-devel] [PATCH v2 23/27] target/arm: Implement pauth_computepac, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 27/27] target/arm: Tidy TBI handling in gen_a64_set_pc, Richard Henderson, 2018/12/14
- [Qemu-devel] [PATCH v2 19/27] target/arm: Export aa64_va_parameters to internals.h, Richard Henderson, 2018/12/14