From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org
Subject: [PATCH v4 21/23] target/arm: Add allocation tag storage for user mode
Date: Thu, 28 Jan 2021 12:41:39 -1000 [thread overview]
Message-ID: <20210128224141.638790-22-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210128224141.638790-1-richard.henderson@linaro.org>
Use the now-saved PAGE_ANON and PAGE_MTE bits,
and the per-page saved data.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/mte_helper.c | 29 +++++++++++++++++++++++++++--
1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/target/arm/mte_helper.c b/target/arm/mte_helper.c
index d55f8d1e1e..1c569336ea 100644
--- a/target/arm/mte_helper.c
+++ b/target/arm/mte_helper.c
@@ -78,8 +78,33 @@ static uint8_t *allocation_tag_mem(CPUARMState *env, int ptr_mmu_idx,
int tag_size, uintptr_t ra)
{
#ifdef CONFIG_USER_ONLY
- /* Tag storage not implemented. */
- return NULL;
+ uint64_t clean_ptr = useronly_clean_ptr(ptr);
+ int flags = page_get_flags(clean_ptr);
+ uint8_t *tags;
+ uintptr_t index;
+
+ if (!(flags & (ptr_access == MMU_DATA_STORE ? PAGE_WRITE : PAGE_READ))) {
+ /* SIGSEGV */
+ arm_cpu_tlb_fill(env_cpu(env), ptr, ptr_size, ptr_access,
+ ptr_mmu_idx, false, ra);
+ g_assert_not_reached();
+ }
+
+ /* Require both MAP_ANON and PROT_MTE for the page. */
+ if (!(flags & PAGE_ANON) || !(flags & PAGE_MTE)) {
+ return NULL;
+ }
+
+ tags = page_get_target_data(clean_ptr);
+ if (tags == NULL) {
+ size_t alloc_size = TARGET_PAGE_SIZE >> (LOG2_TAG_GRANULE + 1);
+ tags = page_alloc_target_data(clean_ptr, alloc_size);
+ assert(tags != NULL);
+ }
+
+ index = extract32(ptr, LOG2_TAG_GRANULE + 1,
+ TARGET_PAGE_BITS - LOG2_TAG_GRANULE - 1);
+ return tags + index;
#else
uintptr_t index;
CPUIOTLBEntry *iotlbentry;
--
2.25.1
next prev parent reply other threads:[~2021-01-28 22:52 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-28 22:41 [PATCH v4 00/23] target-arm: Implement ARMv8.5-MemTag, user mode Richard Henderson
2021-01-28 22:41 ` [PATCH v4 01/23] tcg: Introduce target-specific page data for user-only Richard Henderson
2021-02-02 14:29 ` Peter Maydell
2021-02-03 2:40 ` Richard Henderson
2021-02-03 5:49 ` Richard Henderson
2021-02-03 15:33 ` Alex Bennée
2021-01-28 22:41 ` [PATCH v4 02/23] linux-user: Introduce PAGE_ANON Richard Henderson
2021-01-28 22:41 ` [PATCH v4 03/23] exec: Use uintptr_t for guest_base Richard Henderson
2021-02-02 14:31 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 04/23] exec: Use uintptr_t in cpu_ldst.h Richard Henderson
2021-02-02 14:32 ` Peter Maydell
2021-02-02 15:30 ` Philippe Mathieu-Daudé
2021-01-28 22:41 ` [PATCH v4 05/23] exec: Improve types for guest_addr_valid Richard Henderson
2021-02-02 14:33 ` Peter Maydell
2021-02-02 15:31 ` Philippe Mathieu-Daudé
2021-01-28 22:41 ` [PATCH v4 06/23] linux-user: Check for overflow in access_ok Richard Henderson
2021-01-28 22:41 ` [PATCH v4 07/23] linux-user: Tidy VERIFY_READ/VERIFY_WRITE Richard Henderson
2021-01-28 22:41 ` [PATCH v4 08/23] bsd-user: " Richard Henderson
2021-01-28 22:41 ` [PATCH v4 09/23] linux-user: Do not use guest_addr_valid for h2g_valid Richard Henderson
2021-02-02 14:34 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 10/23] linux-user: Fix guest_addr_valid vs reserved_va Richard Henderson
2021-02-02 14:35 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 11/23] exec: Add support for TARGET_TAGGED_ADDRESSES Richard Henderson
2021-02-02 15:05 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 12/23] linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE Richard Henderson
2021-02-02 14:37 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 13/23] target/arm: Improve gen_top_byte_ignore Richard Henderson
2021-02-02 14:40 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 14/23] target/arm: Use the proper TBI settings for linux-user Richard Henderson
2021-02-02 14:41 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 15/23] linux-user/aarch64: Implement PR_MTE_TCF and PR_MTE_TAG Richard Henderson
2021-02-02 14:43 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 16/23] linux-user/aarch64: Implement PROT_MTE Richard Henderson
2021-01-28 22:41 ` [PATCH v4 17/23] target/arm: Split out syndrome.h from internals.h Richard Henderson
2021-02-02 14:44 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 18/23] linux-user/aarch64: Pass syndrome to EXC_*_ABORT Richard Henderson
2021-02-02 14:44 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 19/23] linux-user/aarch64: Signal SEGV_MTESERR for sync tag check fault Richard Henderson
2021-02-02 14:45 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 20/23] linux-user/aarch64: Signal SEGV_MTEAERR for async tag check error Richard Henderson
2021-02-02 14:46 ` Peter Maydell
2021-01-28 22:41 ` Richard Henderson [this message]
2021-02-02 14:46 ` [PATCH v4 21/23] target/arm: Add allocation tag storage for user mode Peter Maydell
2021-01-28 22:41 ` [PATCH v4 22/23] target/arm: Enable MTE for user-only Richard Henderson
2021-02-02 14:47 ` Peter Maydell
2021-01-28 22:41 ` [PATCH v4 23/23] tests/tcg/aarch64: Add mte smoke tests Richard Henderson
2021-02-02 14:49 ` Peter Maydell
2021-01-28 23:15 ` [PATCH v4 00/23] target-arm: Implement ARMv8.5-MemTag, user mode no-reply
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