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target/arm: Add allocation tag storage for user mode

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Use the now-saved PAGE_ANON and PAGE_MTE bits,
and the per-page saved data.

Backports a11d3830d96ad8077440ce4e0aa60608f1f12dde
This commit is contained in:
Richard Henderson 2021-03-04 18:46:11 -05:00 committed by Lioncash
parent f03656b5c3
commit c588c150e4
1 changed files with 27 additions and 2 deletions
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29
qemu/target/arm/mte_helper.c
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@ -76,8 +76,33 @@ 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;